/* roulang page: index */
:root {
      --bg: #f7f8f8;
      --surface: #ffffff;
      --surface-soft: #eef2f1;
      --ink: #171a1c;
      --muted: #5f686b;
      --weak: #899195;
      --line: #dbe0df;
      --line-strong: #c8d0cf;
      --dark: #111719;
      --dark-2: #182023;
      --cyan: #12c8d2;
      --cyan-dark: #0798a2;
      --green: #50d890;
      --orange: #ff8b3d;
      --violet: #8d6bff;
      --shadow: 0 18px 50px rgba(24, 32, 35, .08);
      --shadow-sm: 0 10px 28px rgba(24, 32, 35, .06);
      --radius-xs: 8px;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --container: 1240px;
      --nav-h: 78px;
      --ease: 180ms ease;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      text-size-adjust: 100%;
    }

    body {
      margin: 0;
      font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--ink);
      background:
        linear-gradient(rgba(23, 26, 28, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(23, 26, 28, .035) 1px, transparent 1px),
        var(--bg);
      background-size: 28px 28px;
      line-height: 1.75;
      letter-spacing: 0;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    button {
      cursor: pointer;
      border: 0;
      background: none;
    }

    input,
    select,
    textarea {
      width: 100%;
      border: 1px solid var(--line);
      border-radius: var(--radius-xs);
      background: #fff;
      color: var(--ink);
      padding: 13px 14px;
      outline: none;
      transition: border-color var(--ease), box-shadow var(--ease);
    }

    textarea {
      min-height: 112px;
      resize: vertical;
    }

    input:focus,
    select:focus,
    textarea:focus,
    button:focus-visible,
    a:focus-visible {
      outline: 3px solid rgba(18, 200, 210, .28);
      outline-offset: 3px;
    }

    .container {
      width: min(100% - 48px, var(--container));
      margin: 0 auto;
    }

    .section {
      padding: 92px 0;
      position: relative;
    }

    .section-tight {
      padding: 64px 0;
    }

    .section-white {
      background: rgba(255, 255, 255, .76);
      border-top: 1px solid rgba(219, 224, 223, .72);
      border-bottom: 1px solid rgba(219, 224, 223, .72);
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(280px, 430px);
      gap: 48px;
      align-items: end;
      margin-bottom: 34px;
    }

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--cyan-dark);
      font-size: 14px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .section-kicker::before {
      content: "";
      width: 28px;
      height: 2px;
      background: var(--cyan);
    }

    h1,
    h2,
    h3,
    p {
      margin: 0;
    }

    h1 {
      font-size: clamp(38px, 5vw, 62px);
      line-height: 1.08;
      font-weight: 850;
      max-width: 900px;
    }

    h2 {
      font-size: clamp(30px, 3.5vw, 44px);
      line-height: 1.18;
      font-weight: 820;
      max-width: 850px;
    }

    h3 {
      font-size: 20px;
      line-height: 1.35;
      font-weight: 780;
    }

    .lead {
      color: var(--muted);
      font-size: 17px;
      line-height: 1.9;
    }

    .text-muted {
      color: var(--muted);
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(247, 248, 248, .92);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(219, 224, 223, .9);
      transition: box-shadow var(--ease), background var(--ease);
    }

    .site-header.is-scrolled {
      box-shadow: 0 8px 26px rgba(17, 23, 25, .08);
      background: rgba(255, 255, 255, .96);
    }

    .topbar {
      border-bottom: 1px solid rgba(219, 224, 223, .75);
      color: var(--muted);
      font-size: 13px;
    }

    .topbar-inner {
      min-height: 38px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 18px;
    }

    .topbar-list {
      display: flex;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
    }

    .topbar-pill {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      color: var(--ink);
      font-weight: 700;
    }

    .topbar-pill::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 4px rgba(80, 216, 144, .15);
    }

    .nav {
      min-height: var(--nav-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: fit-content;
      font-weight: 860;
      font-size: 19px;
      line-height: 1.2;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 13px;
      background:
        linear-gradient(135deg, rgba(18, 200, 210, .9), rgba(80, 216, 144, .85)),
        var(--dark);
      display: grid;
      place-items: center;
      color: #071012;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .36), 0 12px 24px rgba(18, 200, 210, .22);
      font-weight: 900;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 4px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      min-height: 44px;
      padding: 0 12px;
      border-radius: var(--radius-xs);
      color: #303638;
      font-size: 15px;
      font-weight: 720;
      position: relative;
      transition: color var(--ease), background var(--ease);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 12px;
      right: 12px;
      bottom: 6px;
      height: 2px;
      background: var(--cyan);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform var(--ease);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--cyan-dark);
      background: rgba(18, 200, 210, .08);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      transform: scaleX(1);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .menu-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border: 1px solid var(--line);
      border-radius: var(--radius-xs);
      background: var(--surface);
      position: relative;
      transition: border-color var(--ease), background var(--ease);
    }

    .menu-toggle span,
    .menu-toggle::before,
    .menu-toggle::after {
      content: "";
      position: absolute;
      left: 13px;
      right: 13px;
      height: 2px;
      background: var(--ink);
      transition: transform var(--ease), opacity var(--ease), top var(--ease);
    }

    .menu-toggle span {
      top: 22px;
    }

    .menu-toggle::before {
      top: 15px;
    }

    .menu-toggle::after {
      top: 29px;
    }

    .menu-toggle.is-open span {
      opacity: 0;
    }

    .menu-toggle.is-open::before {
      top: 22px;
      transform: rotate(45deg);
    }

    .menu-toggle.is-open::after {
      top: 22px;
      transform: rotate(-45deg);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 18px;
      border-radius: 10px;
      font-weight: 820;
      font-size: 15px;
      line-height: 1;
      border: 1px solid transparent;
      transition: transform var(--ease), box-shadow var(--ease), background var(--ease), border-color var(--ease), color var(--ease);
      white-space: nowrap;
    }

    .btn-primary {
      color: #071012;
      background: var(--cyan);
      box-shadow: 0 12px 28px rgba(18, 200, 210, .24);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      background: #18dbe5;
      box-shadow: 0 16px 34px rgba(18, 200, 210, .28);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, .82);
      color: var(--ink);
      border-color: rgba(255, 255, 255, .8);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      border-color: var(--cyan);
      color: var(--cyan-dark);
    }

    .btn-outline {
      background: transparent;
      color: var(--ink);
      border-color: var(--line-strong);
    }

    .btn-outline:hover {
      transform: translateY(-2px);
      border-color: var(--cyan);
      background: rgba(18, 200, 210, .08);
    }

    .badge,
    .tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: rgba(255, 255, 255, .76);
      color: #3b4245;
      font-size: 13px;
      font-weight: 760;
      padding: 6px 10px;
    }

    .badge-cyan {
      border-color: rgba(18, 200, 210, .35);
      background: rgba(18, 200, 210, .1);
      color: #04727a;
    }

    .hero {
      position: relative;
      min-height: calc(100vh - 118px);
      max-height: 860px;
      color: #fff;
      isolation: isolate;
      overflow: hidden;
      background: var(--dark);
    }

    .hero-track {
      position: absolute;
      inset: 0;
      z-index: -2;
    }

    .hero-slide {
      position: absolute;
      inset: 0;
      background-size: cover;
      background-position: center;
      opacity: 0;
      transform: scale(1.025);
      transition: opacity 700ms ease, transform 1100ms ease;
    }

    .hero-slide.is-active {
      opacity: 1;
      transform: scale(1);
    }

    .hero::after {
      content: "";
      position: absolute;
      inset: 0;
      z-index: -1;
      background:
        linear-gradient(90deg, rgba(8, 12, 14, .88) 0%, rgba(8, 12, 14, .64) 48%, rgba(8, 12, 14, .34) 100%),
        linear-gradient(0deg, rgba(8, 12, 14, .78) 0%, rgba(8, 12, 14, .08) 48%, rgba(8, 12, 14, .45) 100%);
    }

    .hero-inner {
      min-height: calc(100vh - 118px);
      max-height: 860px;
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
      gap: 44px;
      align-items: center;
      padding: 56px 0 76px;
    }

    .hero-copy {
      padding-top: 12px;
    }

    .hero-copy .badge {
      background: rgba(255, 255, 255, .12);
      border-color: rgba(255, 255, 255, .22);
      color: #dffcff;
      margin-bottom: 22px;
    }

    .hero-copy p {
      max-width: 760px;
      margin-top: 24px;
      color: rgba(255, 255, 255, .82);
      font-size: 18px;
      line-height: 1.95;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 30px;
    }

    .before-after {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      align-items: stretch;
    }

    .compare-panel {
      border: 1px solid rgba(255, 255, 255, .18);
      background: rgba(255, 255, 255, .08);
      backdrop-filter: blur(14px);
      border-radius: var(--radius-md);
      padding: 22px;
      min-height: 330px;
      box-shadow: 0 26px 70px rgba(0, 0, 0, .22);
    }

    .compare-panel.after {
      background: rgba(18, 200, 210, .12);
      border-color: rgba(18, 200, 210, .42);
    }

    .compare-label {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: rgba(255, 255, 255, .72);
      font-size: 13px;
      font-weight: 850;
      margin-bottom: 18px;
    }

    .compare-label::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--orange);
    }

    .after .compare-label::before {
      background: var(--green);
    }

    .compare-panel h3 {
      color: #fff;
      margin-bottom: 16px;
    }

    .compare-panel ul {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 12px;
      color: rgba(255, 255, 255, .78);
      font-size: 14px;
      line-height: 1.65;
    }

    .hero-controls {
      position: absolute;
      left: 50%;
      bottom: 28px;
      transform: translateX(-50%);
      display: flex;
      align-items: center;
      gap: 12px;
      z-index: 5;
    }

    .hero-dot {
      width: 9px;
      height: 9px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .42);
      border: 1px solid rgba(255, 255, 255, .52);
      transition: width var(--ease), background var(--ease);
    }

    .hero-dot.is-active {
      width: 34px;
      background: var(--cyan);
      border-color: var(--cyan);
    }

    .hero-arrow {
      width: 40px;
      height: 40px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #fff;
      background: rgba(255, 255, 255, .12);
      border: 1px solid rgba(255, 255, 255, .22);
      transition: background var(--ease), transform var(--ease);
    }

    .hero-arrow:hover {
      background: rgba(18, 200, 210, .32);
      transform: translateY(-1px);
    }

    .kpi-strip {
      transform: translateY(-36px);
      margin-bottom: -36px;
      position: relative;
      z-index: 8;
    }

    .kpi-board {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1px;
      overflow: hidden;
      border-radius: var(--radius-lg);
      border: 1px solid var(--line);
      background: var(--line);
      box-shadow: var(--shadow);
    }

    .kpi-item {
      background: var(--surface);
      padding: 28px;
      transition: background var(--ease);
    }

    .kpi-item:hover {
      background: #fbfdfd;
    }

    .kpi-num {
      display: flex;
      align-items: baseline;
      gap: 4px;
      color: var(--ink);
      font-size: 38px;
      line-height: 1;
      font-weight: 880;
      margin-bottom: 10px;
    }

    .kpi-num span {
      font-size: 16px;
      color: var(--cyan-dark);
    }

    .kpi-item p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.65;
    }

    .pain-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 28px;
      align-items: start;
    }

    .diagnosis {
      display: grid;
      gap: 12px;
    }

    .diagnosis-row {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 16px;
      padding: 18px;
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, .72);
      transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
    }

    .diagnosis-row:hover {
      transform: translateX(4px);
      border-color: rgba(18, 200, 210, .45);
      box-shadow: var(--shadow-sm);
    }

    .diagnosis-row strong {
      color: var(--ink);
      line-height: 1.4;
    }

    .diagnosis-row p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.75;
    }

    .intro-panel {
      display: grid;
      grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
      gap: 38px;
      align-items: center;
    }

    .media-card {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      background: var(--surface);
    }

    .media-card img {
      width: 100%;
      aspect-ratio: 16 / 11;
      object-fit: cover;
    }

    .file-lines {
      margin-top: 24px;
      display: grid;
      gap: 10px;
    }

    .file-line {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      padding: 13px 0;
      border-bottom: 1px solid var(--line);
      color: var(--muted);
      font-size: 15px;
    }

    .file-line strong {
      color: var(--ink);
      white-space: nowrap;
    }

    .architecture {
      display: grid;
      grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
      gap: 32px;
      align-items: start;
    }

    .arch-map {
      display: grid;
      gap: 12px;
      padding: 18px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--line);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }

    .arch-layer {
      display: grid;
      grid-template-columns: 130px 1fr;
      gap: 14px;
      align-items: stretch;
    }

    .arch-layer-name {
      display: grid;
      place-items: center;
      border-radius: var(--radius-xs);
      background: var(--dark);
      color: #dffcff;
      font-size: 14px;
      font-weight: 820;
      padding: 14px 8px;
    }

    .arch-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      padding: 10px;
      border-radius: var(--radius-xs);
      background: var(--surface-soft);
      border: 1px solid var(--line);
    }

    .result-compare {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
    }

    .result-column {
      border-radius: var(--radius-lg);
      border: 1px solid var(--line);
      background: var(--surface);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .result-column header {
      padding: 22px 24px;
      background: var(--surface-soft);
      border-bottom: 1px solid var(--line);
    }

    .result-column.after header {
      background: rgba(18, 200, 210, .12);
    }

    .result-list {
      list-style: none;
      margin: 0;
      padding: 22px 24px 26px;
      display: grid;
      gap: 14px;
    }

    .result-list li {
      position: relative;
      padding-left: 25px;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.7;
    }

    .result-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: .72em;
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: var(--weak);
    }

    .after .result-list li::before {
      background: var(--cyan);
    }

    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .card {
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, .78);
      padding: 24px;
      box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset;
      transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease), background var(--ease);
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(18, 200, 210, .46);
      box-shadow: var(--shadow-sm);
      background: #fff;
    }

    .icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      margin-bottom: 18px;
      background: rgba(18, 200, 210, .1);
      color: var(--cyan-dark);
      font-weight: 900;
    }

    .card p {
      margin-top: 10px;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.75;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }

    .timeline {
      position: relative;
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 12px;
    }

    .timeline::before {
      content: "";
      position: absolute;
      left: 4%;
      right: 4%;
      top: 34px;
      height: 2px;
      background: linear-gradient(90deg, var(--cyan), var(--green), var(--orange));
      z-index: 0;
    }

    .step {
      position: relative;
      z-index: 1;
      padding-top: 62px;
    }

    .step-num {
      position: absolute;
      top: 12px;
      left: 0;
      width: 44px;
      height: 44px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: var(--dark);
      color: #fff;
      border: 3px solid var(--bg);
      font-weight: 860;
    }

    .step-box {
      min-height: 170px;
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }

    .step-box p {
      margin-top: 9px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .product-card {
      overflow: hidden;
      padding: 0;
    }

    .product-card img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      transition: transform 320ms ease;
    }

    .product-card:hover img {
      transform: scale(1.04);
    }

    .product-body {
      padding: 24px;
    }

    .dark-band {
      background: var(--dark);
      color: #fff;
      overflow: hidden;
    }

    .dark-band::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
      background-size: 34px 34px;
      opacity: .42;
    }

    .dark-inner {
      position: relative;
      display: grid;
      grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
      gap: 42px;
      align-items: center;
    }

    .dark-band .lead,
    .dark-band .text-muted {
      color: rgba(255, 255, 255, .72);
    }

    .case-card {
      border: 1px solid rgba(255, 255, 255, .14);
      background: rgba(255, 255, 255, .06);
      border-radius: var(--radius-lg);
      padding: 30px;
    }

    .case-metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 24px;
    }

    .case-metric {
      border: 1px solid rgba(255, 255, 255, .13);
      border-radius: var(--radius-sm);
      padding: 16px;
      background: rgba(255, 255, 255, .04);
    }

    .case-metric strong {
      display: block;
      color: var(--cyan);
      font-size: 26px;
      line-height: 1;
      margin-bottom: 8px;
    }

    .story-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 22px;
    }

    .story-list {
      display: grid;
      gap: 14px;
    }

    .story-card {
      display: grid;
      grid-template-columns: 118px 1fr;
      gap: 18px;
      padding: 18px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
      transition: transform var(--ease), border-color var(--ease);
    }

    .story-card:hover {
      transform: translateY(-3px);
      border-color: rgba(18, 200, 210, .45);
    }

    .story-role {
      color: var(--cyan-dark);
      font-weight: 840;
    }

    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
    }

    .scenario {
      min-height: 210px;
      padding: 22px;
      border-radius: var(--radius-md);
      background: var(--surface);
      border: 1px solid var(--line);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform var(--ease), background var(--ease), border-color var(--ease);
    }

    .scenario:hover {
      transform: translateY(-4px);
      border-color: rgba(18, 200, 210, .48);
      background: #fbfefe;
    }

    .scenario span {
      color: var(--weak);
      font-size: 13px;
      font-weight: 760;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .quote {
      position: relative;
      min-height: 270px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .quote::before {
      content: "“";
      position: absolute;
      top: 12px;
      right: 20px;
      font-size: 64px;
      line-height: 1;
      color: rgba(18, 200, 210, .18);
      font-weight: 900;
    }

    .quote p {
      color: var(--muted);
      font-size: 15px;
      line-height: 1.82;
      position: relative;
    }

    .quote-author {
      margin-top: 22px;
      padding-top: 16px;
      border-top: 1px solid var(--line);
      color: var(--ink);
      font-weight: 820;
    }

    .news-grid {
      display: grid;
      grid-template-columns: 1.2fr repeat(2, .9fr);
      gap: 18px;
    }

    .news-card {
      overflow: hidden;
      padding: 0;
    }

    .news-card.large {
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .news-card img {
      width: 100%;
      height: 100%;
      min-height: 240px;
      object-fit: cover;
    }

    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .news-meta {
      color: var(--cyan-dark);
      font-size: 13px;
      font-weight: 820;
    }

    .assurance-wrap {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 28px;
    }

    .assurance-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .assurance-item {
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
    }

    .assurance-item strong {
      display: block;
      margin-bottom: 8px;
    }

    .assurance-item p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-cta {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 420px;
      gap: 28px;
      align-items: start;
    }

    .faq-list {
      display: grid;
      gap: 10px;
    }

    .faq-item {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      min-height: 64px;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      color: var(--ink);
      font-weight: 820;
      text-align: left;
      transition: background var(--ease);
    }

    .faq-question:hover {
      background: rgba(18, 200, 210, .07);
    }

    .faq-icon {
      width: 28px;
      height: 28px;
      flex: 0 0 auto;
      border-radius: 50%;
      display: grid;
      place-items: center;
      border: 1px solid var(--line-strong);
      transition: transform var(--ease), background var(--ease);
    }

    .faq-answer {
      display: grid;
      grid-template-rows: 0fr;
      transition: grid-template-rows 220ms ease;
    }

    .faq-answer > div {
      overflow: hidden;
    }

    .faq-answer p {
      padding: 0 20px 20px;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.8;
    }

    .faq-item.is-open .faq-answer {
      grid-template-rows: 1fr;
    }

    .faq-item.is-open .faq-icon {
      transform: rotate(45deg);
      background: var(--cyan);
      color: #071012;
      border-color: var(--cyan);
    }

    .contact-card {
      position: sticky;
      top: 140px;
      border-radius: var(--radius-lg);
      background: var(--dark);
      color: #fff;
      padding: 26px;
      box-shadow: var(--shadow);
    }

    .contact-card p {
      color: rgba(255, 255, 255, .72);
      margin-top: 10px;
      font-size: 15px;
      line-height: 1.75;
    }

    .contact-form {
      margin-top: 20px;
      display: grid;
      gap: 12px;
    }

    .contact-form input,
    .contact-form select,
    .contact-form textarea {
      background: rgba(255, 255, 255, .08);
      border-color: rgba(255, 255, 255, .16);
      color: #fff;
    }

    .contact-form input::placeholder,
    .contact-form textarea::placeholder {
      color: rgba(255, 255, 255, .52);
    }

    .contact-form select {
      color-scheme: dark;
    }

    .form-note {
      font-size: 13px;
      color: rgba(255, 255, 255, .58);
    }

    .form-status {
      display: none;
      border-radius: var(--radius-xs);
      padding: 10px 12px;
      background: rgba(80, 216, 144, .12);
      color: #a8ffd0;
      border: 1px solid rgba(80, 216, 144, .26);
      font-size: 14px;
    }

    .form-status.is-visible {
      display: block;
    }

    .site-footer {
      background: #0d1214;
      color: rgba(255, 255, 255, .76);
      padding: 64px 0 26px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr .8fr 1fr;
      gap: 32px;
      padding-bottom: 36px;
      border-bottom: 1px solid rgba(255, 255, 255, .12);
    }

    .footer-brand {
      color: #fff;
      font-size: 22px;
      font-weight: 860;
      margin-bottom: 14px;
    }

    .footer-title {
      color: #fff;
      font-weight: 820;
      margin-bottom: 14px;
    }

    .footer-links {
      display: grid;
      gap: 9px;
    }

    .footer-links a {
      color: rgba(255, 255, 255, .68);
      transition: color var(--ease);
    }

    .footer-links a:hover {
      color: var(--cyan);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      align-items: center;
      padding-top: 24px;
      font-size: 13px;
      color: rgba(255, 255, 255, .55);
    }

    .backtop {
      position: fixed;
      right: 22px;
      bottom: 22px;
      width: 46px;
      height: 46px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: var(--dark);
      color: #fff;
      border: 1px solid rgba(255, 255, 255, .12);
      box-shadow: var(--shadow);
      opacity: 0;
      pointer-events: none;
      transform: translateY(10px);
      transition: opacity var(--ease), transform var(--ease), background var(--ease);
      z-index: 50;
    }

    .backtop.is-visible {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }

    .backtop:hover {
      background: var(--cyan-dark);
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 520ms ease, transform 520ms ease;
    }

    .reveal.is-visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 1200px) {
      .nav-link {
        padding: 0 9px;
        font-size: 14px;
      }

      .hero-inner {
        grid-template-columns: 1fr;
        gap: 28px;
        min-height: auto;
        padding-top: 72px;
      }

      .before-after {
        max-width: 860px;
      }

      .timeline {
        grid-template-columns: repeat(3, 1fr);
      }

      .timeline::before {
        display: none;
      }

      .scenario-grid {
        grid-template-columns: repeat(3, 1fr);
      }

      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 992px) {
      .container {
        width: min(100% - 36px, var(--container));
      }

      .topbar-inner {
        align-items: flex-start;
        flex-direction: column;
        padding: 10px 0;
        gap: 8px;
      }

      .menu-toggle {
        display: block;
      }

      .nav {
        min-height: 68px;
      }

      .nav-menu {
        position: fixed;
        left: 18px;
        right: 18px;
        top: 118px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        border: 1px solid var(--line);
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, .98);
        box-shadow: var(--shadow);
      }

      .nav-menu.is-open {
        display: flex;
      }

      .nav-link {
        justify-content: space-between;
        min-height: 48px;
      }

      .nav-actions .btn {
        display: none;
      }

      .section {
        padding: 72px 0;
      }

      .section-head,
      .pain-grid,
      .intro-panel,
      .architecture,
      .dark-inner,
      .story-grid,
      .assurance-wrap,
      .faq-cta {
        grid-template-columns: 1fr;
      }

      .kpi-board,
      .advantage-grid,
      .product-grid,
      .news-grid,
      .assurance-list {
        grid-template-columns: repeat(2, 1fr);
      }

      .news-card.large {
        grid-template-columns: 1fr;
      }

      .contact-card {
        position: static;
      }
    }

    @media (max-width: 768px) {
      :root {
        --nav-h: 68px;
      }

      .brand {
        font-size: 17px;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
      }

      .hero {
        min-height: auto;
        max-height: none;
      }

      .hero-inner {
        padding: 52px 0 88px;
      }

      .hero-copy p {
        font-size: 16px;
        line-height: 1.85;
      }

      .before-after,
      .result-compare,
      .kpi-board,
      .advantage-grid,
      .product-grid,
      .timeline,
      .scenario-grid,
      .testimonial-grid,
      .news-grid,
      .assurance-list,
      .case-metrics {
        grid-template-columns: 1fr;
      }

      .compare-panel {
        min-height: auto;
      }

      .diagnosis-row,
      .arch-layer,
      .story-card {
        grid-template-columns: 1fr;
      }

      .kpi-strip {
        transform: none;
        margin-bottom: 0;
        padding-top: 18px;
      }

      .section {
        padding: 62px 0;
      }

      .timeline .step {
        padding-top: 56px;
      }

      .scenario {
        min-height: 170px;
      }

      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 576px) {
      .container {
        width: min(100% - 28px, var(--container));
      }

      .topbar-list {
        gap: 8px 12px;
      }

      .topbar {
        font-size: 12px;
      }

      .nav-menu {
        top: 128px;
        left: 14px;
        right: 14px;
      }

      h1 {
        font-size: 36px;
      }

      h2 {
        font-size: 30px;
      }

      .hero-actions,
      .btn {
        width: 100%;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .hero-controls {
        bottom: 18px;
      }

      .section-head {
        gap: 20px;
      }

      .card,
      .product-body,
      .contact-card,
      .case-card {
        padding: 20px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .file-line {
        flex-direction: column;
        gap: 4px;
      }
    }

    @media (max-width: 375px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      h1 {
        font-size: 32px;
      }

      h2 {
        font-size: 27px;
      }

      .compare-panel,
      .kpi-item,
      .card,
      .step-box,
      .scenario,
      .assurance-item {
        padding: 18px;
      }

      .hero-arrow {
        width: 36px;
        height: 36px;
      }
    }

/* roulang page: category1 */
:root {
      --bg: #f7f8f8;
      --surface: #ffffff;
      --surface-soft: #eef2f1;
      --ink: #171a1c;
      --muted: #5f686b;
      --weak: #899195;
      --line: #dbe0df;
      --line-strong: #c8d0cf;
      --dark: #111719;
      --dark-2: #182023;
      --cyan: #12c8d2;
      --cyan-dark: #0798a2;
      --green: #50d890;
      --orange: #ff8b3d;
      --violet: #8d6bff;
      --shadow: 0 18px 50px rgba(24, 32, 35, .08);
      --shadow-sm: 0 10px 28px rgba(24, 32, 35, .06);
      --radius-xs: 8px;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --container: 1240px;
      --nav-h: 78px;
      --ease: 180ms ease;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      text-size-adjust: 100%;
    }

    body {
      margin: 0;
      font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--ink);
      background:
        linear-gradient(rgba(23, 26, 28, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(23, 26, 28, .035) 1px, transparent 1px),
        var(--bg);
      background-size: 28px 28px;
      line-height: 1.75;
      letter-spacing: 0;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    button {
      cursor: pointer;
      border: 0;
      background: none;
    }

    input,
    select,
    textarea {
      width: 100%;
      border: 1px solid var(--line);
      border-radius: var(--radius-xs);
      background: #fff;
      color: var(--ink);
      padding: 13px 14px;
      outline: none;
      transition: border-color var(--ease), box-shadow var(--ease), background var(--ease);
    }

    textarea {
      min-height: 112px;
      resize: vertical;
    }

    input:focus,
    select:focus,
    textarea:focus,
    button:focus-visible,
    a:focus-visible {
      outline: 3px solid rgba(18, 200, 210, .28);
      outline-offset: 3px;
    }

    .container {
      width: min(100% - 48px, var(--container));
      margin: 0 auto;
    }

    .section {
      padding: 92px 0;
      position: relative;
    }

    .section-tight {
      padding: 64px 0;
    }

    .section-white {
      background: rgba(255, 255, 255, .76);
      border-top: 1px solid rgba(219, 224, 223, .72);
      border-bottom: 1px solid rgba(219, 224, 223, .72);
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(280px, 430px);
      gap: 48px;
      align-items: end;
      margin-bottom: 34px;
    }

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--cyan-dark);
      font-size: 14px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .section-kicker::before {
      content: "";
      width: 28px;
      height: 2px;
      background: var(--cyan);
    }

    h1,
    h2,
    h3,
    p {
      margin-top: 0;
    }

    h1 {
      font-size: 54px;
      line-height: 1.08;
      margin-bottom: 22px;
      letter-spacing: 0;
    }

    h2 {
      font-size: 38px;
      line-height: 1.18;
      margin-bottom: 16px;
      letter-spacing: 0;
    }

    h3 {
      font-size: 20px;
      line-height: 1.35;
      margin-bottom: 10px;
      letter-spacing: 0;
    }

    p {
      margin-bottom: 0;
    }

    .lead {
      color: var(--muted);
      font-size: 17px;
      line-height: 1.9;
    }

    .text-muted {
      color: var(--muted);
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(247, 248, 248, .92);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(219, 224, 223, .9);
      transition: box-shadow var(--ease), background var(--ease);
    }

    .site-header.is-scrolled {
      box-shadow: 0 8px 26px rgba(17, 23, 25, .08);
      background: rgba(255, 255, 255, .96);
    }

    .topbar {
      border-bottom: 1px solid rgba(219, 224, 223, .75);
      color: var(--muted);
      font-size: 13px;
    }

    .topbar-inner {
      min-height: 38px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 18px;
    }

    .topbar-list {
      display: flex;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
    }

    .topbar-pill {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      color: var(--ink);
      font-weight: 700;
    }

    .topbar-pill::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 4px rgba(80, 216, 144, .15);
    }

    .nav {
      min-height: var(--nav-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: fit-content;
      font-weight: 860;
      font-size: 19px;
      line-height: 1.2;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 13px;
      background:
        linear-gradient(135deg, rgba(18, 200, 210, .9), rgba(80, 216, 144, .85)),
        var(--dark);
      display: grid;
      place-items: center;
      color: #071012;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .36), 0 12px 24px rgba(18, 200, 210, .22);
      font-weight: 900;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 4px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      min-height: 44px;
      padding: 0 12px;
      border-radius: var(--radius-xs);
      color: #303638;
      font-size: 15px;
      font-weight: 720;
      position: relative;
      transition: color var(--ease), background var(--ease);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 12px;
      right: 12px;
      bottom: 6px;
      height: 2px;
      background: var(--cyan);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform var(--ease);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--cyan-dark);
      background: rgba(18, 200, 210, .08);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      transform: scaleX(1);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 18px;
      border-radius: 10px;
      font-weight: 800;
      font-size: 15px;
      border: 1px solid transparent;
      transition: transform var(--ease), box-shadow var(--ease), background var(--ease), border-color var(--ease), color var(--ease);
      white-space: nowrap;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn:active {
      transform: translateY(0);
    }

    .btn-primary {
      background: var(--dark);
      color: #fff;
      box-shadow: 0 12px 26px rgba(17, 23, 25, .15);
    }

    .btn-primary:hover {
      background: #070b0c;
      box-shadow: 0 16px 34px rgba(17, 23, 25, .2);
    }

    .btn-secondary {
      background: rgba(18, 200, 210, .1);
      color: var(--cyan-dark);
      border-color: rgba(18, 200, 210, .28);
    }

    .btn-secondary:hover {
      background: rgba(18, 200, 210, .16);
      border-color: rgba(18, 200, 210, .46);
    }

    .menu-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border: 1px solid var(--line);
      border-radius: var(--radius-xs);
      background: var(--surface);
      position: relative;
      transition: border-color var(--ease), background var(--ease);
    }

    .menu-toggle span,
    .menu-toggle::before,
    .menu-toggle::after {
      content: "";
      position: absolute;
      left: 13px;
      right: 13px;
      height: 2px;
      border-radius: 2px;
      background: var(--ink);
      transition: transform var(--ease), opacity var(--ease), top var(--ease);
    }

    .menu-toggle span {
      top: 22px;
    }

    .menu-toggle::before {
      top: 15px;
    }

    .menu-toggle::after {
      top: 29px;
    }

    .menu-toggle.is-open span {
      opacity: 0;
    }

    .menu-toggle.is-open::before {
      top: 22px;
      transform: rotate(45deg);
    }

    .menu-toggle.is-open::after {
      top: 22px;
      transform: rotate(-45deg);
    }

    .page-hero {
      padding: 74px 0 58px;
      background:
        linear-gradient(90deg, rgba(247, 248, 248, .98) 0%, rgba(247, 248, 248, .88) 52%, rgba(247, 248, 248, .42) 100%),
        url("/assets/images/d4aacbeb18548bec.webp") center / cover no-repeat;
      border-bottom: 1px solid rgba(219, 224, 223, .88);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(330px, .72fr);
      gap: 54px;
      align-items: center;
    }

    .hero-label {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      padding: 8px 12px;
      border: 1px solid rgba(18, 200, 210, .28);
      border-radius: 999px;
      background: rgba(255, 255, 255, .72);
      color: var(--cyan-dark);
      font-size: 14px;
      font-weight: 800;
    }

    .hero-label::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 5px rgba(18, 200, 210, .13);
    }

    .hero-copy {
      max-width: 760px;
    }

    .hero-copy .lead {
      font-size: 18px;
      max-width: 720px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .trust-strip {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      margin-top: 34px;
      max-width: 790px;
    }

    .trust-item {
      border: 1px solid rgba(200, 208, 207, .92);
      background: rgba(255, 255, 255, .72);
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      color: var(--muted);
      font-size: 14px;
    }

    .trust-item strong {
      display: block;
      color: var(--ink);
      font-size: 18px;
      line-height: 1.25;
      margin-bottom: 4px;
    }

    .hero-panel {
      border: 1px solid rgba(219, 224, 223, .78);
      background: rgba(255, 255, 255, .78);
      border-radius: var(--radius-lg);
      padding: 18px;
      box-shadow: var(--shadow);
    }

    .hero-panel img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      border-radius: 18px;
      margin-bottom: 18px;
    }

    .panel-list {
      display: grid;
      gap: 10px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .panel-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--muted);
      font-size: 15px;
      padding: 10px 0;
      border-bottom: 1px solid rgba(219, 224, 223, .8);
    }

    .panel-list li:last-child {
      border-bottom: 0;
    }

    .panel-list li::before {
      content: "";
      width: 9px;
      height: 9px;
      flex: 0 0 auto;
      margin-top: 9px;
      border-radius: 2px;
      background: var(--green);
      box-shadow: 0 0 0 4px rgba(80, 216, 144, .12);
    }

    .tag-matrix {
      display: grid;
      grid-template-columns: repeat(6, minmax(0, 1fr));
      gap: 12px;
    }

    .tag-cell {
      min-height: 118px;
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, .82);
      box-shadow: var(--shadow-sm);
      transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
    }

    .tag-cell:hover {
      transform: translateY(-4px);
      border-color: rgba(18, 200, 210, .5);
      box-shadow: var(--shadow);
    }

    .tag-cell span {
      display: inline-flex;
      width: 32px;
      height: 32px;
      align-items: center;
      justify-content: center;
      border-radius: 9px;
      background: rgba(18, 200, 210, .12);
      color: var(--cyan-dark);
      font-weight: 900;
      margin-bottom: 16px;
    }

    .tag-cell h3 {
      font-size: 18px;
      margin-bottom: 6px;
    }

    .tag-cell p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.65;
    }

    .solution-layout {
      display: grid;
      grid-template-columns: 280px minmax(0, 1fr);
      gap: 26px;
      align-items: start;
    }

    .solution-aside {
      position: sticky;
      top: 128px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }

    .solution-aside h2 {
      font-size: 24px;
      margin-bottom: 12px;
    }

    .aside-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      min-height: 28px;
      padding: 3px 10px;
      border-radius: 999px;
      background: rgba(18, 200, 210, .1);
      color: var(--cyan-dark);
      border: 1px solid rgba(18, 200, 210, .2);
      font-size: 13px;
      font-weight: 760;
    }

    .badge.orange {
      background: rgba(255, 139, 61, .11);
      color: #a95311;
      border-color: rgba(255, 139, 61, .24);
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .solution-card {
      position: relative;
      overflow: hidden;
      min-height: 248px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
    }

    .solution-card:hover {
      transform: translateY(-4px);
      border-color: rgba(18, 200, 210, .46);
      box-shadow: var(--shadow);
    }

    .solution-card::after {
      content: "";
      position: absolute;
      inset: auto 18px 0 18px;
      height: 3px;
      background: linear-gradient(90deg, var(--cyan), var(--green));
      transform: scaleX(0);
      transform-origin: left;
      transition: transform var(--ease);
    }

    .solution-card:hover::after {
      transform: scaleX(1);
    }

    .card-icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      color: var(--ink);
      background: linear-gradient(135deg, rgba(18, 200, 210, .18), rgba(80, 216, 144, .18));
      font-weight: 900;
      margin-bottom: 18px;
    }

    .solution-card p {
      color: var(--muted);
      font-size: 15px;
      line-height: 1.75;
    }

    .deliverables {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }

    .deliverables span {
      padding: 4px 9px;
      border-radius: 7px;
      background: var(--surface-soft);
      color: #3b4447;
      font-size: 13px;
      font-weight: 700;
    }

    .more-line {
      display: flex;
      justify-content: flex-end;
      margin-top: 22px;
    }

    .architecture {
      display: grid;
      grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
      gap: 36px;
      align-items: center;
    }

    .arch-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(219, 224, 223, .9);
      box-shadow: var(--shadow);
      background: var(--surface);
    }

    .arch-visual img {
      width: 100%;
      aspect-ratio: 5 / 4;
      object-fit: cover;
    }

    .layer-stack {
      display: grid;
      gap: 12px;
    }

    .layer {
      display: grid;
      grid-template-columns: 150px minmax(0, 1fr);
      gap: 16px;
      align-items: center;
      padding: 18px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, .8);
      transition: transform var(--ease), border-color var(--ease);
    }

    .layer:hover {
      transform: translateX(4px);
      border-color: rgba(18, 200, 210, .42);
    }

    .layer strong {
      font-size: 16px;
    }

    .layer span {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .process-band {
      background: var(--dark);
      color: #f3f7f7;
      overflow: hidden;
    }

    .process-band .section-kicker,
    .process-band .lead {
      color: rgba(243, 247, 247, .72);
    }

    .process-band .section-kicker::before {
      background: var(--green);
    }

    .mini-timeline {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 14px;
      counter-reset: step;
    }

    .step {
      counter-increment: step;
      min-height: 190px;
      padding: 22px;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, .055);
      border: 1px solid rgba(255, 255, 255, .12);
      transition: transform var(--ease), background var(--ease), border-color var(--ease);
    }

    .step:hover {
      transform: translateY(-4px);
      background: rgba(255, 255, 255, .085);
      border-color: rgba(18, 200, 210, .42);
    }

    .step::before {
      content: "0" counter(step);
      display: inline-flex;
      color: var(--cyan);
      font-weight: 900;
      margin-bottom: 22px;
    }

    .step h3 {
      color: #fff;
      font-size: 18px;
    }

    .step p {
      color: rgba(243, 247, 247, .68);
      font-size: 14px;
      line-height: 1.7;
    }

    .proof-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 18px;
    }

    .proof-card {
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: var(--surface);
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }

    .proof-card strong {
      display: block;
      font-size: 28px;
      line-height: 1;
      margin-bottom: 12px;
    }

    .proof-card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }

    .proof-card p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .entry-panel {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 390px;
      gap: 28px;
      padding: 34px;
      border-radius: var(--radius-lg);
      background:
        linear-gradient(135deg, rgba(18, 200, 210, .1), rgba(80, 216, 144, .08)),
        var(--surface);
      border: 1px solid rgba(18, 200, 210, .24);
      box-shadow: var(--shadow);
      align-items: center;
    }

    .entry-links {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      margin-top: 22px;
    }

    .entry-links a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      min-height: 48px;
      padding: 0 14px;
      border-radius: var(--radius-xs);
      background: rgba(255, 255, 255, .78);
      border: 1px solid rgba(219, 224, 223, .9);
      color: var(--ink);
      font-weight: 760;
      transition: transform var(--ease), border-color var(--ease), color var(--ease);
    }

    .entry-links a:hover {
      transform: translateY(-2px);
      border-color: rgba(18, 200, 210, .48);
      color: var(--cyan-dark);
    }

    .contact-card {
      border-radius: var(--radius-md);
      background: #fff;
      border: 1px solid var(--line);
      padding: 20px;
    }

    .contact-card form {
      display: grid;
      gap: 10px;
    }

    .form-message {
      display: none;
      margin-top: 10px;
      color: var(--cyan-dark);
      font-weight: 760;
      font-size: 14px;
    }

    .form-message.is-show {
      display: block;
    }

    .site-footer {
      padding: 64px 0 30px;
      background: #0f1517;
      color: rgba(255, 255, 255, .72);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr .9fr .9fr;
      gap: 34px;
      padding-bottom: 34px;
      border-bottom: 1px solid rgba(255, 255, 255, .12);
    }

    .footer-brand {
      color: #fff;
      font-size: 22px;
      font-weight: 900;
      margin-bottom: 14px;
    }

    .footer-title {
      color: #fff;
      font-weight: 850;
      margin-bottom: 14px;
    }

    .footer-links {
      display: grid;
      gap: 9px;
    }

    .footer-links a,
    .footer-links span {
      color: rgba(255, 255, 255, .68);
      font-size: 14px;
      transition: color var(--ease);
    }

    .footer-links a:hover {
      color: var(--cyan);
    }

    .footer-grid p {
      margin: 0;
      color: rgba(255, 255, 255, .66);
      font-size: 14px;
      line-height: 1.8;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      padding-top: 22px;
      color: rgba(255, 255, 255, .58);
      font-size: 13px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(16px);
      transition: opacity 520ms ease, transform 520ms ease;
    }

    .reveal.is-visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 1200px) {
      :root {
        --container: 1120px;
      }

      .nav {
        gap: 14px;
      }

      .nav-link {
        padding: 0 9px;
        font-size: 14px;
      }

      .tag-matrix {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .mini-timeline {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }

    @media (max-width: 992px) {
      h1 {
        font-size: 42px;
      }

      h2 {
        font-size: 32px;
      }

      .topbar-inner {
        align-items: flex-start;
        padding: 8px 0;
      }

      .topbar-list:last-child {
        display: none;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .nav-menu {
        position: absolute;
        left: 24px;
        right: 24px;
        top: calc(100% + 10px);
        display: grid;
        gap: 6px;
        padding: 14px;
        border: 1px solid var(--line);
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, .98);
        box-shadow: var(--shadow);
        transform: translateY(-10px);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--ease), transform var(--ease);
      }

      .nav-menu.is-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }

      .nav-link {
        width: 100%;
        justify-content: flex-start;
      }

      .hero-grid,
      .architecture,
      .entry-panel {
        grid-template-columns: 1fr;
      }

      .hero-panel {
        max-width: 620px;
      }

      .section-head {
        grid-template-columns: 1fr;
        gap: 16px;
      }

      .solution-layout {
        grid-template-columns: 1fr;
      }

      .solution-aside {
        position: static;
      }

      .cards-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .proof-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 768px) {
      .container {
        width: min(100% - 32px, var(--container));
      }

      .section {
        padding: 70px 0;
      }

      .page-hero {
        padding: 52px 0 44px;
      }

      h1 {
        font-size: 36px;
      }

      h2 {
        font-size: 28px;
      }

      .brand {
        font-size: 17px;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
      }

      .nav-actions .btn {
        display: none;
      }

      .trust-strip,
      .tag-matrix,
      .cards-grid,
      .mini-timeline,
      .proof-grid,
      .entry-links {
        grid-template-columns: 1fr;
      }

      .layer {
        grid-template-columns: 1fr;
        gap: 8px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 576px) {
      .topbar {
        font-size: 12px;
      }

      .topbar-list {
        gap: 10px;
      }

      .hero-actions {
        display: grid;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .hero-panel {
        padding: 12px;
        border-radius: var(--radius-md);
      }

      .solution-card,
      .proof-card,
      .entry-panel,
      .contact-card {
        padding: 18px;
      }

      .entry-panel {
        border-radius: var(--radius-md);
      }

      .footer-bottom {
        display: grid;
      }
    }

    @media (max-width: 375px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      h1 {
        font-size: 32px;
      }

      h2 {
        font-size: 25px;
      }

      .brand span:last-child {
        max-width: 180px;
      }

      .nav-menu {
        left: 12px;
        right: 12px;
      }

      .btn {
        white-space: normal;
        text-align: center;
      }
    }

/* roulang page: category2 */
:root {
  --bg:#f7f8f8;
  --surface:#fff;
  --surface-soft:#eef2f1;
  --ink:#171a1c;
  --muted:#5f686b;
  --weak:#899195;
  --line:#dbe0df;
  --line-strong:#c8d0cf;
  --dark:#111719;
  --dark-2:#182023;
  --cyan:#12c8d2;
  --cyan-dark:#0798a2;
  --green:#50d890;
  --orange:#ff8b3d;
  --violet:#8d6bff;
  --shadow:0 18px 50px rgba(24,32,35,.08);
  --shadow-sm:0 10px 28px rgba(24,32,35,.06);
  --radius-xs:8px;
  --radius-sm:12px;
  --radius-md:16px;
  --radius-lg:24px;
  --container:1240px;
  --nav-h:68px;
  --ease:180ms ease;
}
*,
*::before,
*::after { box-sizing:border-box; }
html { scroll-behavior:smooth; text-size-adjust:100%; }
body {
  margin:0;
  color:var(--ink);
  background:
    linear-gradient(rgba(23,26,28,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(23,26,28,.035) 1px,transparent 1px),
    var(--bg);
  background-size:28px 28px;
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  line-height:1.75;
  letter-spacing:0;
  overflow-x:hidden;
}
a { color:inherit; text-decoration:none; }
img { display:block; max-width:100%; height:auto; }
button,input,select,textarea { font:inherit; }
button { border:0; background:none; cursor:pointer; }
input,select,textarea {
  width:100%;
  padding:13px 14px;
  color:var(--ink);
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-xs);
  outline:none;
  transition:border-color var(--ease),box-shadow var(--ease);
}
textarea { min-height:116px; resize:vertical; }
input:focus,select:focus,textarea:focus,
button:focus-visible,a:focus-visible {
  outline:3px solid rgba(18,200,210,.28);
  outline-offset:3px;
}
.container { width:min(100% - 48px,var(--container)); margin:0 auto; }
.site-header {
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(247,248,248,.93);
  backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(219,224,223,.9);
  transition:box-shadow var(--ease),background var(--ease);
}
.site-header.is-scrolled { background:rgba(255,255,255,.97); box-shadow:0 8px 26px rgba(17,23,25,.08); }
.topbar { color:var(--muted); font-size:13px; border-bottom:1px solid rgba(219,224,223,.75); }
.topbar-inner { min-height:38px; display:flex; justify-content:space-between; align-items:center; gap:18px; }
.topbar-list { display:flex; align-items:center; gap:18px; flex-wrap:wrap; }
.topbar-pill { display:inline-flex; align-items:center; gap:7px; color:var(--ink); font-weight:700; }
.topbar-pill::before {
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 4px rgba(80,216,144,.15);
}
.nav { min-height:var(--nav-h); display:flex; align-items:center; justify-content:space-between; gap:22px; }
.brand { display:inline-flex; align-items:center; gap:12px; min-width:max-content; font-size:19px; font-weight:860; line-height:1.2; }
.brand-mark {
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  color:#071012;
  font-weight:900;
  border-radius:13px;
  background:linear-gradient(135deg,rgba(18,200,210,.9),rgba(80,216,144,.85)),var(--dark);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.36),0 12px 24px rgba(18,200,210,.22);
}
.nav-menu { display:flex; align-items:center; gap:4px; margin:0; padding:0; list-style:none; }
.nav-link {
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  color:#303638;
  font-size:15px;
  font-weight:720;
  border-radius:var(--radius-xs);
  transition:color var(--ease),background var(--ease);
}
.nav-link::after {
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:6px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--ease);
}
.nav-link:hover,.nav-link.active { color:var(--cyan-dark); background:rgba(18,200,210,.08); }
.nav-link:hover::after,.nav-link.active::after { transform:scaleX(1); }
.nav-actions { display:flex; align-items:center; gap:10px; }
.btn {
  min-height:46px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:0 18px;
  border:1px solid transparent;
  border-radius:var(--radius-xs);
  font-size:15px;
  font-weight:800;
  transition:transform var(--ease),box-shadow var(--ease),background var(--ease),border-color var(--ease);
}
.btn:hover { transform:translateY(-2px); }
.btn-primary { color:#071012; background:var(--cyan); box-shadow:0 10px 22px rgba(18,200,210,.2); }
.btn-primary:hover { background:#36d5dc; box-shadow:0 14px 28px rgba(18,200,210,.28); }
.btn-dark { color:#fff; background:var(--dark); }
.btn-dark:hover { background:#263236; }
.btn-outline { color:var(--ink); border-color:var(--line-strong); background:rgba(255,255,255,.65); }
.btn-outline:hover { border-color:var(--cyan-dark); color:var(--cyan-dark); background:#fff; }
.menu-toggle {
  display:none;
  position:relative;
  width:46px;
  height:46px;
  border:1px solid var(--line);
  border-radius:var(--radius-xs);
  background:var(--surface);
}
.menu-toggle span,.menu-toggle::before,.menu-toggle::after {
  content:"";
  position:absolute;
  left:13px;
  width:18px;
  height:2px;
  background:var(--ink);
  transition:transform var(--ease),top var(--ease);
}
.menu-toggle span { top:22px; }
.menu-toggle::before { top:16px; }
.menu-toggle::after { top:28px; }
.menu-toggle[aria-expanded="true"] span { opacity:0; }
.menu-toggle[aria-expanded="true"]::before { top:22px; transform:rotate(45deg); }
.menu-toggle[aria-expanded="true"]::after { top:22px; transform:rotate(-45deg); }

main { display:block; }
.section { position:relative; padding:90px 0; }
.section-tight { padding:62px 0; }
.section-white { background:rgba(255,255,255,.78); border-top:1px solid rgba(219,224,223,.72); border-bottom:1px solid rgba(219,224,223,.72); }
.section-head {
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(280px,430px);
  gap:48px;
  align-items:end;
  margin-bottom:36px;
}
.section-kicker {
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:12px;
  color:var(--cyan-dark);
  font-size:14px;
  font-weight:800;
}
.section-kicker::before { content:""; width:28px; height:2px; background:var(--cyan); }
h1,h2,h3,p { margin-top:0; }
h1,h2,h3 { line-height:1.2; letter-spacing:0; }
h1 { max-width:820px; margin-bottom:22px; font-size:clamp(38px,5vw,62px); font-weight:860; }
h2 { margin-bottom:16px; font-size:clamp(30px,3.5vw,44px); font-weight:850; }
h3 { margin-bottom:10px; font-size:20px; font-weight:820; }
.lead { color:var(--muted); font-size:17px; line-height:1.9; }
.eyebrow {
  display:inline-flex;
  padding:6px 10px;
  color:var(--cyan-dark);
  background:rgba(18,200,210,.1);
  border:1px solid rgba(18,200,210,.2);
  border-radius:var(--radius-xs);
  font-size:13px;
  font-weight:800;
}
.page-intro {
  padding:72px 0 68px;
  background:linear-gradient(105deg,rgba(255,255,255,.9),rgba(238,242,241,.72));
  border-bottom:1px solid var(--line);
}
.intro-layout { display:grid; grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr); gap:70px; align-items:center; }
.intro-meta { display:flex; flex-wrap:wrap; gap:10px; margin-top:28px; }
.intro-visual { position:relative; min-height:330px; }
.intro-visual img { width:100%; height:330px; object-fit:cover; border-radius:var(--radius-lg); box-shadow:var(--shadow); }
.visual-note {
  position:absolute;
  right:-18px;
  bottom:-20px;
  width:190px;
  padding:17px;
  color:#fff;
  background:var(--dark);
  border-left:3px solid var(--cyan);
  border-radius:var(--radius-sm);
  box-shadow:var(--shadow);
}
.visual-note strong { display:block; margin-bottom:4px; color:var(--cyan); font-size:25px; line-height:1; }
.visual-note span { color:#c5d1d0; font-size:13px; }

.screen-grid { display:grid; grid-template-columns:1.15fr .85fr; gap:24px; align-items:stretch; }
.screen-stage { position:relative; min-height:510px; overflow:hidden; border-radius:var(--radius-lg); background:var(--dark); }
.screen-stage img { width:100%; height:100%; min-height:510px; object-fit:cover; opacity:.8; }
.screen-stage::after {
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(17,23,25,.56),rgba(17,23,25,.05) 72%);
}
.stage-label { position:absolute; z-index:1; left:28px; top:25px; color:#fff; font-size:14px; font-weight:800; letter-spacing:.04em; }
.stage-copy { position:absolute; z-index:1; left:28px; right:28px; bottom:28px; color:#fff; }
.stage-copy h3 { max-width:390px; font-size:30px; }
.stage-copy p { max-width:480px; margin-bottom:0; color:#cbd7d5; }
.screen-list { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.screen-item {
  min-height:158px;
  padding:22px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  transition:transform var(--ease),border-color var(--ease),box-shadow var(--ease);
}
.screen-item:hover { transform:translateY(-4px); border-color:rgba(18,200,210,.7); box-shadow:var(--shadow-sm); }
.screen-number { color:var(--cyan-dark); font-family:Inter,system-ui,sans-serif; font-size:13px; font-weight:850; }
.screen-item strong { font-size:19px; }
.screen-item small { color:var(--muted); font-size:14px; }

.feature-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.feature-card {
  min-height:250px;
  padding:25px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.feature-card:nth-child(2),.feature-card:nth-child(5) { transform:translateY(22px); }
.feature-card:hover { transform:translateY(-5px); border-color:var(--cyan); box-shadow:var(--shadow-sm); }
.feature-card:nth-child(2):hover,.feature-card:nth-child(5):hover { transform:translateY(17px); }
.card-index { display:flex; justify-content:space-between; align-items:center; margin-bottom:32px; color:var(--weak); font-size:13px; font-weight:800; }
.icon-box { width:38px; height:38px; display:grid; place-items:center; color:var(--dark); background:var(--cyan); border-radius:10px; font-weight:900; }
.feature-card p { margin-bottom:18px; color:var(--muted); font-size:15px; line-height:1.75; }
.tag-row { display:flex; flex-wrap:wrap; gap:7px; }
.tag { padding:4px 8px; color:var(--muted); background:var(--surface-soft); border-radius:6px; font-size:12px; }

.spec-layout { display:grid; grid-template-columns:.82fr 1.18fr; gap:68px; align-items:start; }
.spec-copy { position:sticky; top:150px; }
.spec-copy p { color:var(--muted); font-size:16px; }
.spec-list { border-top:1px solid var(--line-strong); }
.spec-row {
  display:grid;
  grid-template-columns:150px 1fr;
  gap:28px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.spec-row strong { color:var(--ink); }
.spec-row p { margin:0; color:var(--muted); font-size:15px; }
.marker { display:inline-block; width:8px; height:8px; margin-right:8px; background:var(--cyan); border-radius:2px; }

.comparison { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.compare-panel { padding:28px; border-radius:var(--radius-md); border:1px solid var(--line); background:var(--surface); }
.compare-panel.dark { color:#fff; background:var(--dark); border-color:var(--dark); }
.compare-panel h3 { display:flex; justify-content:space-between; align-items:center; }
.compare-panel.dark p,.compare-panel.dark li { color:#c4cfce; }
.compare-panel ul { margin:18px 0 0; padding:0; list-style:none; }
.compare-panel li { position:relative; padding:11px 0 11px 24px; color:var(--muted); border-top:1px solid var(--line); font-size:15px; }
.compare-panel.dark li { border-color:rgba(255,255,255,.14); }
.compare-panel li::before { content:""; position:absolute; left:0; top:20px; width:8px; height:2px; background:var(--cyan); }

.test-layout { display:grid; grid-template-columns:1fr 1fr; gap:26px; align-items:stretch; }
.test-image { overflow:hidden; border-radius:var(--radius-lg); }
.test-image img { width:100%; height:100%; min-height:360px; object-fit:cover; }
.test-board { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.test-card { padding:21px; border:1px solid var(--line); border-radius:var(--radius-sm); background:#fff; }
.test-card strong { display:block; margin-bottom:7px; font-size:18px; }
.test-card span { color:var(--muted); font-size:14px; }
.status { display:inline-flex; align-items:center; gap:6px; margin-bottom:22px; color:var(--green); font-size:13px; font-weight:800; }
.status::before { content:""; width:7px; height:7px; border-radius:50%; background:var(--green); }

.faq-contact { background:var(--dark); color:#fff; }
.faq-contact .section-kicker { color:var(--cyan); }
.faq-contact h2 { color:#fff; }
.faq-grid { display:grid; grid-template-columns:1fr 1fr; gap:70px; align-items:start; }
.faq-list { border-top:1px solid rgba(255,255,255,.18); }
.faq-item { border-bottom:1px solid rgba(255,255,255,.18); }
.faq-question {
  width:100%;
  min-height:64px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:15px 0;
  color:#fff;
  text-align:left;
  font-size:16px;
  font-weight:750;
}
.faq-question span:last-child { color:var(--cyan); font-size:24px; transition:transform var(--ease); }
.faq-item.is-open .faq-question span:last-child { transform:rotate(45deg); }
.faq-answer { display:none; padding:0 30px 20px 0; color:#c2cfcd; font-size:15px; }
.faq-item.is-open .faq-answer { display:block; }
.contact-panel { padding:28px; background:#f6faf9; color:var(--ink); border-radius:var(--radius-md); }
.contact-panel h3 { font-size:25px; }
.contact-panel p { color:var(--muted); font-size:15px; }
.form-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.form-full { grid-column:1 / -1; }
.contact-panel .btn { width:100%; margin-top:14px; }
.form-note { margin:12px 0 0 !important; color:var(--weak) !important; font-size:12px !important; }

.site-footer { padding:64px 0 22px; color:#c2cccb; background:var(--dark); border-top:1px solid rgba(255,255,255,.08); }
.footer-grid { display:grid; grid-template-columns:1.35fr .8fr 1fr 1fr; gap:40px; }
.footer-brand { margin-bottom:14px; color:#fff; font-size:20px; font-weight:850; }
.site-footer p { margin:0; color:#9eabaa; font-size:14px; line-height:1.8; }
.footer-title { margin-bottom:16px; color:#fff; font-weight:800; }
.footer-links { display:flex; flex-direction:column; gap:9px; color:#9eabaa; font-size:14px; }
.footer-links a { transition:color var(--ease); }
.footer-links a:hover { color:var(--cyan); }
.footer-bottom {
  display:flex;
  justify-content:space-between;
  gap:18px;
  margin-top:48px;
  padding-top:18px;
  color:#7d8988;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;
}
.reveal { opacity:0; transform:translateY(18px); transition:opacity .6s ease,transform .6s ease; }
.reveal.is-visible { opacity:1; transform:none; }

@media (max-width:1200px) {
  .nav-menu { gap:0; }
  .nav-link { padding:0 8px; font-size:14px; }
  .brand { font-size:17px; }
}
@media (max-width:992px) {
  .container { width:min(100% - 40px,var(--container)); }
  .nav-menu {
    position:absolute;
    left:20px;
    right:20px;
    top:calc(100% + 1px);
    display:none;
    padding:12px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:0 0 var(--radius-md) var(--radius-md);
    box-shadow:var(--shadow);
  }
  .nav-menu.is-open { display:block; }
  .nav-menu li,.nav-link { width:100%; }
  .nav-link { min-height:48px; }
  .nav-link::after { left:10px; right:auto; width:28px; bottom:5px; }
  .menu-toggle { display:block; }
  .nav-actions .btn { display:none; }
  .intro-layout,.screen-grid,.spec-layout,.test-layout { grid-template-columns:1fr; gap:30px; }
  .spec-copy { position:static; }
  .footer-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width:768px) {
  .container { width:min(100% - 32px,var(--container)); }
  .topbar-inner { align-items:flex-start; padding:9px 0; }
  .topbar-inner > .topbar-list:last-child { display:none; }
  .topbar-list { gap:8px 14px; }
  .section { padding:68px 0; }
  .section-head,.faq-grid { grid-template-columns:1fr; gap:16px; }
  .page-intro { padding:54px 0 52px; }
  h1 { font-size:40px; }
  .screen-list,.feature-grid,.comparison { grid-template-columns:1fr 1fr; }
  .feature-card:nth-child(2),.feature-card:nth-child(5) { transform:none; }
  .feature-card:nth-child(2):hover,.feature-card:nth-child(5):hover { transform:translateY(-5px); }
  .footer-grid { gap:28px 18px; }
}
@media (max-width:576px) {
  .brand { max-width:220px; font-size:16px; }
  .brand-mark { width:38px; height:38px; }
  .intro-visual img,.screen-stage img { min-height:260px; height:260px; }
  .intro-visual { min-height:290px; }
  .visual-note { right:8px; bottom:-12px; width:176px; }
  .screen-stage { min-height:420px; }
  .screen-list,.feature-grid,.comparison,.test-board,.form-grid { grid-template-columns:1fr; }
  .screen-item { min-height:126px; }
  .feature-card { min-height:0; }
  .spec-row { grid-template-columns:1fr; gap:6px; }
  .contact-panel { padding:22px 18px; }
  .footer-grid { grid-template-columns:1fr; }
  .footer-bottom { flex-direction:column; gap:5px; }
}
@media (max-width:375px) {
  .container { width:calc(100% - 24px); }
  h1 { font-size:34px; }
  h2 { font-size:30px; }
  .topbar { font-size:12px; }
  .brand { max-width:190px; font-size:15px; }
}

/* roulang page: category3 */
:root{--bg:#f7f8f8;--surface:#fff;--surface-soft:#eef2f1;--ink:#171a1c;--muted:#5f686b;--weak:#899195;--line:#dbe0df;--line-strong:#c8d0cf;--dark:#111719;--dark-2:#182023;--cyan:#12c8d2;--cyan-dark:#0798a2;--green:#50d890;--orange:#ff8b3d;--violet:#8d6bff;--shadow:0 18px 50px rgba(24,32,35,.08);--shadow-sm:0 10px 28px rgba(24,32,35,.06);--radius-xs:8px;--radius-sm:12px;--radius-md:16px;--radius-lg:24px;--container:1240px;--nav-h:68px;--ease:180ms ease}
*{box-sizing:border-box}
html{scroll-behavior:smooth;text-size-adjust:100%}
body{margin:0;color:var(--ink);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;background:linear-gradient(rgba(23,26,28,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(23,26,28,.035) 1px,transparent 1px),var(--bg);background-size:28px 28px;line-height:1.75;letter-spacing:0;overflow-x:hidden}
a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button,input,select,textarea{font:inherit}button{cursor:pointer;border:0;background:none}
.container{width:min(calc(100% - 48px),var(--container));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,248,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(219,224,223,.9);transition:box-shadow var(--ease)}
.site-header.is-scrolled{box-shadow:0 8px 26px rgba(17,23,25,.08)}
.topbar{border-bottom:1px solid rgba(219,224,223,.75);color:var(--muted);font-size:13px}.topbar-inner{min-height:38px;display:flex;justify-content:space-between;align-items:center;gap:18px}.topbar-list{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.topbar-pill{color:var(--ink);font-weight:700}.topbar-pill:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(80,216,144,.15);margin-right:7px}
.nav{min-height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{display:inline-flex;align-items:center;gap:12px;min-width:max-content;font-weight:850;font-size:18px;line-height:1.2}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,rgba(18,200,210,.9),rgba(80,216,144,.85));display:grid;place-items:center;color:#071012;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.36),0 12px 24px rgba(18,200,210,.22)}
.nav-menu{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}.nav-link{display:inline-flex;align-items:center;min-height:44px;padding:0 11px;border-radius:var(--radius-xs);color:#303638;font-size:14px;font-weight:720;position:relative;transition:color var(--ease),background var(--ease)}.nav-link:after{content:"";position:absolute;left:11px;right:11px;bottom:6px;height:2px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform var(--ease)}.nav-link:hover,.nav-link.active{color:var(--cyan-dark);background:rgba(18,200,210,.08)}.nav-link:hover:after,.nav-link.active:after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 19px;border-radius:var(--radius-xs);font-size:15px;font-weight:800;transition:transform var(--ease),box-shadow var(--ease),background var(--ease),border-color var(--ease)}.btn:hover{transform:translateY(-2px)}.btn-primary{color:#071012;background:var(--cyan);box-shadow:0 8px 20px rgba(18,200,210,.2)}.btn-primary:hover{background:#3bd7de}.btn-dark{background:var(--dark);color:#fff}.btn-outline{border:1px solid var(--line-strong);background:#fff}.btn-outline:hover{border-color:var(--cyan);color:var(--cyan-dark)}
.menu-toggle{display:none;width:46px;height:46px;border:1px solid var(--line);border-radius:var(--radius-xs);background:#fff;position:relative}.menu-toggle span,.menu-toggle:before,.menu-toggle:after{content:"";position:absolute;width:19px;height:2px;background:var(--ink);left:13px;transition:transform var(--ease),top var(--ease)}.menu-toggle span{top:22px}.menu-toggle:before{top:16px}.menu-toggle:after{top:28px}.menu-toggle.open span{opacity:0}.menu-toggle.open:before{top:22px;transform:rotate(45deg)}.menu-toggle.open:after{top:22px;transform:rotate(-45deg)}
.section{padding:88px 0;position:relative}.section-white{background:rgba(255,255,255,.8);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,440px);gap:44px;align-items:end;margin-bottom:34px}.section-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--cyan-dark);font-size:14px;font-weight:800;margin-bottom:12px}.section-kicker:before{content:"";width:28px;height:2px;background:var(--cyan)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(38px,5vw,62px);line-height:1.15;letter-spacing:0;margin-bottom:22px}h2{font-size:clamp(30px,3.4vw,44px);line-height:1.25;margin-bottom:16px}h3{font-size:20px;line-height:1.4;margin-bottom:9px}.lead{color:var(--muted);font-size:17px;line-height:1.9}.eyebrow{font-size:13px;color:var(--cyan-dark);font-weight:800;letter-spacing:0}.tag{display:inline-flex;align-items:center;min-height:28px;padding:0 9px;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px;font-weight:750;background:#fff}.tag.cyan{border-color:rgba(18,200,210,.35);color:var(--cyan-dark);background:rgba(18,200,210,.08)}
.page-intro{padding:78px 0 60px;background:#fff;border-bottom:1px solid var(--line)}.intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:end}.intro-note{border-left:3px solid var(--cyan);padding:5px 0 5px 22px;color:var(--muted);font-size:16px}.intro-note strong{display:block;color:var(--ink);font-size:18px;margin-bottom:8px}
.capability-grid{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);background:#fff}.capability{min-height:144px;padding:22px;border-right:1px solid var(--line);transition:background var(--ease),transform var(--ease)}.capability:last-child{border-right:0}.capability:hover{background:var(--surface-soft);transform:translateY(-3px)}.capability-index{color:var(--orange);font-size:13px;font-weight:850}.capability h3{margin:18px 0 4px;font-size:18px}.capability p{color:var(--muted);font-size:14px;margin:0}
.voice-layout{display:grid;grid-template-columns:.82fr 1.18fr;gap:28px;align-items:stretch}.voice-image{min-height:440px;border-radius:var(--radius-md);overflow:hidden;position:relative;background:#20282a}.voice-image img{width:100%;height:100%;object-fit:cover}.voice-image:after{content:"语音交互 / 场景引擎";position:absolute;left:24px;bottom:22px;color:#fff;font-weight:800;font-size:18px}.module-list{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.module-item{padding:25px;background:#fff;min-height:170px}.module-icon{width:34px;height:34px;display:grid;place-items:center;background:var(--dark);color:var(--cyan);border-radius:8px;font-weight:900;margin-bottom:18px}.module-item p{color:var(--muted);font-size:14px;margin:0}
.flow-section{background:var(--dark);color:#fff}.flow-section .section-kicker{color:var(--cyan)}.flow-section .lead{color:#aebabc}.flow-track{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid #435052;margin-top:46px}.flow-step{position:relative;padding:27px 24px 10px 0;border-right:1px solid #435052;margin-right:24px}.flow-step:last-child{border:0}.flow-step:before{content:"";position:absolute;top:-5px;left:0;width:9px;height:9px;background:var(--cyan);border-radius:50%;box-shadow:0 0 0 5px rgba(18,200,210,.14)}.flow-step b{display:block;color:var(--cyan);font-size:14px;margin-bottom:13px}.flow-step h3{font-size:18px}.flow-step p{color:#aebabc;font-size:14px;margin:0}
.scene-chain{display:grid;grid-template-columns:1fr 1.2fr 1fr 1.2fr 1fr;align-items:center;gap:12px;margin-top:28px}.chain-node{min-height:118px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}.chain-node strong{display:block;font-size:16px;margin-bottom:7px}.chain-node span{color:var(--muted);font-size:13px}.chain-arrow{text-align:center;color:var(--cyan-dark);font-size:24px}
.privacy-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.privacy-item{padding:24px;border-top:2px solid var(--cyan);background:#fff;box-shadow:var(--shadow-sm)}.privacy-item h3{font-size:19px}.privacy-item p{color:var(--muted);font-size:15px;margin:0}
.test-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:stretch}.test-panel{padding:30px;background:var(--surface-soft);border:1px solid var(--line);border-radius:var(--radius-md)}.test-panel h3{margin-bottom:20px}.test-list{list-style:none;padding:0;margin:0;display:grid;gap:12px}.test-list li{display:flex;gap:12px;align-items:flex-start;padding-bottom:12px;border-bottom:1px solid var(--line);font-size:15px}.test-list li:before{content:"✓";color:var(--cyan-dark);font-weight:900}.test-side{padding:32px;background:var(--dark);border-radius:var(--radius-md);color:#fff}.test-side .metric{font-size:46px;line-height:1;color:var(--cyan);font-weight:850;margin:22px 0 7px}.test-side p{color:#b6c0c1;font-size:14px}
.faq-list{max-width:900px;border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;text-align:left;padding:22px 0;color:var(--ink);font-size:17px;font-weight:800}.faq-question span:last-child{font-size:25px;color:var(--cyan-dark);font-weight:400;transition:transform var(--ease)}.faq-answer{display:none;padding:0 42px 22px 0;color:var(--muted);font-size:15px}.faq-item.open .faq-answer{display:block}.faq-item.open .faq-question span:last-child{transform:rotate(45deg)}
.cta-band{background:var(--cyan);padding:58px 0}.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px}.cta-band h2{margin:0;font-size:34px}.cta-band p{margin:7px 0 0;color:#15565b}.cta-band .btn-dark:hover{background:#263134}
.site-footer{background:var(--dark);color:#fff;padding:66px 0 24px}.footer-grid{display:grid;grid-template-columns:1.35fr .8fr 1fr 1fr;gap:42px}.footer-brand{font-size:21px;font-weight:850;margin-bottom:14px}.site-footer p{color:#aebabc;font-size:14px;margin:0;line-height:1.8}.footer-title{font-weight:800;margin-bottom:15px}.footer-links{display:grid;gap:8px;color:#aebabc;font-size:14px}.footer-links a:hover{color:var(--cyan)}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #354144;margin-top:46px;padding-top:19px;color:#899698;font-size:13px}
@media(max-width:1200px){.nav-menu{gap:0}.nav-link{padding:0 8px;font-size:13px}.intro-grid{gap:40px}}
@media(max-width:992px){.nav-menu{position:absolute;top:100%;left:24px;right:24px;display:none;padding:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius-sm)}.nav-menu.open{display:grid}.nav-link{width:100%;padding:0 14px}.menu-toggle{display:block}.nav-actions .btn{display:none}.capability-grid{grid-template-columns:repeat(3,1fr)}.capability:nth-child(3){border-right:0}.capability:nth-child(n+4){border-top:1px solid var(--line)}.voice-layout,.test-grid{grid-template-columns:1fr}.voice-image{min-height:320px}.flow-track{grid-template-columns:repeat(3,1fr);row-gap:20px}.flow-step:nth-child(3){border-right:0}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.container{width:min(calc(100% - 32px),var(--container))}.topbar-inner{padding:7px 0}.topbar-inner .topbar-list:last-child{display:none}.section{padding:64px 0}.section-head,.intro-grid{grid-template-columns:1fr;gap:12px}.page-intro{padding:54px 0 42px}h1{font-size:40px}.capability-grid{grid-template-columns:repeat(2,1fr)}.capability:nth-child(3){border-right:1px solid var(--line)}.capability:nth-child(even){border-right:0}.capability:nth-child(n+3){border-top:1px solid var(--line)}.scene-chain{grid-template-columns:1fr;gap:8px}.chain-arrow{transform:rotate(90deg);height:22px}.module-list,.privacy-grid{grid-template-columns:1fr}.flow-track{grid-template-columns:1fr;border-top:0;margin-top:25px}.flow-step{border-right:0;border-top:1px solid #435052;margin:0;padding:25px 0 16px 24px}.flow-step:before{top:29px;left:0}.footer-grid{grid-template-columns:1fr;gap:28px}.footer-bottom{display:grid}.cta-inner{display:grid;gap:20px}.cta-band h2{font-size:29px}}
@media(max-width:520px){.brand{font-size:16px;gap:8px}.brand-mark{width:38px;height:38px}.capability{padding:18px;min-height:155px}.voice-image{min-height:250px}.test-side .metric{font-size:38px}.btn{width:100%}.cta-inner .btn{width:auto}.topbar{font-size:12px}}
@media(max-width:375px){.container{width:calc(100% - 28px)}h1{font-size:36px}.capability-grid{grid-template-columns:1fr}.capability,.capability:nth-child(3){border-right:0;border-top:1px solid var(--line)}.capability:first-child{border-top:0}}

/* roulang page: category4 */
:root{
 --bg:#f7f8f8;--surface:#fff;--surface-soft:#eef2f1;--ink:#171a1c;--muted:#5f686b;--weak:#899195;
 --line:#dbe0df;--line-strong:#c8d0cf;--dark:#111719;--dark-2:#182023;--cyan:#12c8d2;
 --cyan-dark:#0798a2;--green:#50d890;--orange:#ff8b3d;--violet:#8d6bff;
 --shadow:0 18px 50px rgba(24,32,35,.08);--shadow-sm:0 10px 28px rgba(24,32,35,.06);
 --radius-xs:8px;--radius-sm:12px;--radius-md:16px;--radius-lg:24px;--container:1240px;--nav-h:68px;--ease:180ms ease
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;text-size-adjust:100%}
body{margin:0;color:var(--ink);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;line-height:1.75;letter-spacing:0;background:linear-gradient(rgba(23,26,28,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(23,26,28,.035) 1px,transparent 1px),var(--bg);background-size:28px 28px;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit}
button{cursor:pointer;border:0;background:none}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(18,200,210,.3);outline-offset:3px}
.container{width:min(calc(100% - 48px),var(--container));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,248,.94);backdrop-filter:blur(18px);border-bottom:1px solid rgba(219,224,223,.9)}
.topbar{border-bottom:1px solid rgba(219,224,223,.75);color:var(--muted);font-size:13px}
.topbar-inner{min-height:38px;display:flex;justify-content:space-between;align-items:center;gap:18px}
.topbar-list{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.topbar-pill{display:inline-flex;align-items:center;gap:7px;color:var(--ink);font-weight:700}
.topbar-pill:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(80,216,144,.15)}
.nav{min-height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:max-content;font-weight:850;font-size:19px;line-height:1.2}
.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,rgba(18,200,210,.9),rgba(80,216,144,.85)),var(--dark);display:grid;place-items:center;color:#071012;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.36),0 12px 24px rgba(18,200,210,.22)}
.nav-menu{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.nav-link{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;border-radius:var(--radius-xs);color:#303638;font-size:15px;font-weight:720;position:relative;transition:color var(--ease),background var(--ease)}
.nav-link:after{content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform var(--ease)}
.nav-link:hover,.nav-link.active{color:var(--cyan-dark);background:rgba(18,200,210,.08)}
.nav-link:hover:after,.nav-link.active:after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 18px;border-radius:var(--radius-xs);font-weight:800;transition:transform var(--ease),background var(--ease),border-color var(--ease),box-shadow var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--cyan);color:#071012;box-shadow:0 10px 22px rgba(18,200,210,.2)}
.btn-primary:hover{background:#27dce3;box-shadow:0 14px 28px rgba(18,200,210,.28)}
.btn-dark{background:var(--dark);color:#fff}
.btn-outline{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink)}
.btn-outline:hover{border-color:var(--cyan-dark);color:var(--cyan-dark)}
.menu-toggle{display:none;width:46px;height:46px;border:1px solid var(--line);border-radius:var(--radius-xs);background:var(--surface)}
.menu-toggle span,.menu-toggle span:before,.menu-toggle span:after{display:block;width:19px;height:2px;background:var(--ink);margin:auto;position:relative}
.menu-toggle span:before,.menu-toggle span:after{content:"";position:absolute;left:0}
.menu-toggle span:before{top:-6px}.menu-toggle span:after{top:6px}
main{min-height:600px}
.page-head{padding:76px 0 58px;background:var(--surface);border-bottom:1px solid var(--line)}
.page-head-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:end}
.eyebrow,.section-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--cyan-dark);font-size:14px;font-weight:850;margin-bottom:12px}
.eyebrow:before,.section-kicker:before{content:"";width:28px;height:2px;background:var(--cyan)}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(38px,5vw,60px);line-height:1.16;letter-spacing:0;margin-bottom:22px;max-width:760px}
h2{font-size:clamp(28px,3.4vw,42px);line-height:1.25;margin-bottom:16px}
h3{font-size:20px;line-height:1.4;margin-bottom:10px}
.lead{font-size:17px;color:var(--muted);line-height:1.9}
.head-note{padding-left:24px;border-left:2px solid var(--cyan);color:var(--muted);font-size:16px}
.section{padding:86px 0;position:relative}
.section-white{background:rgba(255,255,255,.8);border-top:1px solid rgba(219,224,223,.72);border-bottom:1px solid rgba(219,224,223,.72)}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,470px);gap:45px;align-items:end;margin-bottom:34px}
.section-head p{color:var(--muted);font-size:16px}
.tag-list{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.tag{padding:6px 10px;border:1px solid var(--line);border-radius:7px;background:var(--surface-soft);font-size:13px;color:var(--muted)}
.platforms{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}
.platform{min-height:142px;padding:25px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(255,255,255,.62);transition:transform var(--ease),background var(--ease),border-color var(--ease)}
.platform:hover{transform:translateY(-4px);background:#fff;border-color:var(--cyan)}
.platform strong{display:block;font-size:21px;margin-bottom:8px}
.platform span{color:var(--muted);font-size:14px}
.solution-layout{display:grid;grid-template-columns:270px 1fr;gap:22px;align-items:stretch}
.solution-index{background:var(--dark);color:#fff;padding:28px;border-radius:var(--radius-md)}
.solution-index h3{color:var(--cyan);font-size:18px}
.solution-index ul{list-style:none;padding:0;margin:25px 0 0}
.solution-index li{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.12);color:#c4ced0}
.architecture{display:grid;gap:12px}
.arch-layer{display:grid;grid-template-columns:150px 1fr;gap:14px;align-items:center;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.arch-layer b{color:var(--cyan-dark)}
.arch-items{display:flex;flex-wrap:wrap;gap:8px}
.arch-items span{padding:7px 11px;background:var(--surface-soft);border-radius:6px;font-size:14px}
.capability-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.capability{padding:25px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease)}
.capability:hover{transform:translateY(-5px);border-color:var(--cyan);box-shadow:var(--shadow-sm)}
.icon{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;background:rgba(18,200,210,.12);color:var(--cyan-dark);font-weight:900;margin-bottom:18px}
.capability p,.deliverable p{color:var(--muted);font-size:15px;margin-bottom:0}
.feature-line{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-bottom:1px solid var(--line);align-items:center}
.feature-line strong{font-size:17px}.feature-line span{font-size:14px;color:var(--muted);text-align:right}
.dark-band{background:var(--dark);color:#fff;padding:78px 0}
.dark-band .section-kicker{color:var(--cyan)}
.dark-band .section-head p{color:#aebabc}
.dark-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.dark-grid img{width:100%;aspect-ratio:1.45;object-fit:cover;border-radius:var(--radius-md);border:1px solid rgba(255,255,255,.16)}
.dark-list{display:grid;gap:15px;margin-top:24px}
.dark-list div{padding:17px 0;border-bottom:1px solid rgba(255,255,255,.14);color:#c7d0d1}
.dark-list b{display:block;color:#fff;margin-bottom:3px}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:2px solid var(--cyan);margin-top:44px}
.step{padding:24px 18px 0;border-right:1px solid var(--line);position:relative}
.step:before{content:"";position:absolute;top:-8px;left:18px;width:13px;height:13px;border:3px solid var(--cyan);background:var(--bg);border-radius:50%}
.step:last-child{border-right:0}.step small{color:var(--cyan-dark);font-weight:800}.step p{color:var(--muted);font-size:14px}
.deliverables{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.deliverable{padding:24px;border-left:3px solid var(--cyan);background:var(--surface);border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:28px}
.metric{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm)}
.metric strong{display:block;font-size:34px;line-height:1.2;color:var(--cyan-dark)}
.metric span{display:block;color:var(--muted);font-size:14px;margin-top:8px}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-question{width:100%;display:flex;justify-content:space-between;gap:20px;text-align:left;padding:21px 0;font-weight:800;color:var(--ink)}
.faq-question i{font-style:normal;color:var(--cyan-dark);font-size:24px;line-height:1;transition:transform var(--ease)}
.faq-answer{display:none;max-width:800px;padding:0 45px 21px 0;color:var(--muted);font-size:15px}
.faq-item.open .faq-answer{display:block}.faq-item.open .faq-question i{transform:rotate(45deg)}
.cta-band{padding:70px 0;background:var(--cyan);color:#071012}
.cta-content{display:flex;align-items:center;justify-content:space-between;gap:30px}
.cta-content p{max-width:620px;margin:0;color:#164448}
.cta-band .btn-dark:hover{background:#283437}
.site-footer{background:var(--dark);color:#c1cbcc;padding:64px 0 22px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px}
.footer-brand{color:#fff;font-size:20px;font-weight:850;margin-bottom:16px}
.site-footer p{font-size:14px;line-height:1.8;color:#9da9ab}
.footer-title{color:#fff;font-size:15px;font-weight:800;margin-bottom:15px}
.footer-links{display:grid;gap:9px;font-size:14px}.footer-links a,.footer-links span{color:#aebabc;transition:color var(--ease)}.footer-links a:hover{color:var(--cyan)}
.footer-bottom{display:flex;justify-content:space-between;gap:18px;border-top:1px solid rgba(255,255,255,.13);margin-top:45px;padding-top:18px;color:#879496;font-size:13px}
@media(max-width:1200px){.nav-menu{gap:0}.nav-link{padding:0 8px;font-size:14px}.page-head-grid{gap:40px}}
@media(max-width:992px){.nav-menu{position:absolute;top:100%;left:24px;right:24px;display:none;padding:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);border-radius:var(--radius-sm)}.nav-menu.is-open{display:grid}.nav-link{width:100%;padding:0 14px}.menu-toggle{display:block}.nav-actions .btn{display:none}.page-head-grid,.dark-grid{grid-template-columns:1fr}.platforms{grid-template-columns:repeat(2,1fr)}.capability-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.container{width:min(100% - 32px,var(--container))}.topbar-inner{padding:8px 0}.topbar-inner>div:last-child{display:none}.section{padding:62px 0}.page-head{padding:54px 0 42px}.section-head{grid-template-columns:1fr;gap:8px}.solution-layout{grid-template-columns:1fr}.timeline{grid-template-columns:1fr;border-top:0;border-left:2px solid var(--cyan);margin-left:8px}.step{border-right:0;border-bottom:1px solid var(--line);padding:12px 0 20px 25px}.step:before{top:17px;left:-8px}.metrics{grid-template-columns:repeat(2,1fr)}.cta-content{display:grid}.footer-bottom{display:grid}}
@media(max-width:576px){h1{font-size:38px}.brand{font-size:16px}.brand-mark{width:38px;height:38px}.platforms,.capability-grid,.deliverables{grid-template-columns:1fr}.feature-line{display:grid;gap:4px}.feature-line span{text-align:left}.metrics{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr;gap:26px}.footer-bottom{font-size:12px}}
@media(max-width:375px){.container{width:calc(100% - 24px)}h1{font-size:34px}.topbar-list{gap:8px;font-size:12px}.metrics{grid-template-columns:1fr}.btn{width:100%}}

/* roulang page: category5 */
:root{
 --bg:#f7f8f8;--surface:#fff;--surface-soft:#eef2f1;--ink:#171a1c;--muted:#5f686b;--weak:#899195;
 --line:#dbe0df;--line-strong:#c8d0cf;--dark:#111719;--dark-2:#182023;--cyan:#12c8d2;
 --cyan-dark:#0798a2;--green:#50d890;--orange:#ff8b3d;--violet:#8d6bff;
 --shadow:0 18px 50px rgba(24,32,35,.08);--shadow-sm:0 10px 28px rgba(24,32,35,.06);
 --radius-xs:8px;--radius-sm:12px;--radius-md:16px;--radius-lg:24px;--container:1240px;--ease:200ms ease
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;text-size-adjust:100%}
body{margin:0;color:var(--ink);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;line-height:1.75;letter-spacing:0;background:linear-gradient(rgba(23,26,28,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(23,26,28,.035) 1px,transparent 1px),var(--bg);background-size:28px 28px;overflow-x:hidden}
a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button,input,select,textarea{font:inherit}button{cursor:pointer;border:0;background:none}
.container{width:min(calc(100% - 48px),var(--container));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,248,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(219,224,223,.9);box-shadow:0 8px 26px rgba(17,23,25,.04)}
.topbar{border-bottom:1px solid rgba(219,224,223,.75);color:var(--muted);font-size:13px}.topbar-inner{min-height:38px;display:flex;justify-content:space-between;align-items:center;gap:18px}.topbar-list{display:flex;gap:18px;flex-wrap:wrap}.topbar-pill{color:var(--ink);font-weight:750}.topbar-pill:before{content:"";display:inline-block;width:7px;height:7px;margin-right:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(80,216,144,.15)}
.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{display:inline-flex;align-items:center;gap:12px;min-width:max-content;font-weight:850;font-size:19px;line-height:1.2}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,rgba(18,200,210,.9),rgba(80,216,144,.85)),var(--dark);display:grid;place-items:center;color:#071012;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.36),0 12px 24px rgba(18,200,210,.22)}
.nav-menu{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}.nav-link{display:inline-flex;align-items:center;min-height:44px;padding:0 11px;border-radius:8px;color:#303638;font-size:14px;font-weight:720;position:relative;transition:color var(--ease),background var(--ease)}.nav-link:after{content:"";position:absolute;left:11px;right:11px;bottom:5px;height:2px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform var(--ease)}.nav-link:hover,.nav-link.active{color:var(--cyan-dark);background:rgba(18,200,210,.08)}.nav-link:hover:after,.nav-link.active:after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 18px;border-radius:9px;font-weight:800;font-size:14px;transition:transform var(--ease),background var(--ease),box-shadow var(--ease),border-color var(--ease)}.btn:hover{transform:translateY(-2px)}.btn-primary{color:#071012;background:var(--cyan);box-shadow:0 10px 22px rgba(18,200,210,.2)}.btn-primary:hover{background:#35d7df}.btn-dark{color:#fff;background:var(--dark)}.btn-outline{border:1px solid var(--line-strong);background:var(--surface)}.btn:focus-visible,a:focus-visible{outline:3px solid rgba(18,200,210,.3);outline-offset:3px}
.menu-toggle{display:none;width:46px;height:46px;border:1px solid var(--line);border-radius:8px;background:#fff}.menu-toggle span,.menu-toggle span:before,.menu-toggle span:after{display:block;width:18px;height:2px;background:var(--ink);margin:auto;position:relative}.menu-toggle span:before,.menu-toggle span:after{content:"";position:absolute;left:0}.menu-toggle span:before{top:-6px}.menu-toggle span:after{top:6px}
.page-intro{padding:82px 0 72px;background:#fff;border-bottom:1px solid var(--line)}.intro-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:70px;align-items:end}.kicker{display:inline-flex;align-items:center;gap:9px;color:var(--cyan-dark);font-size:14px;font-weight:800;margin-bottom:15px}.kicker:before{content:"";width:28px;height:2px;background:var(--cyan)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(38px,5vw,62px);line-height:1.13;letter-spacing:0;margin-bottom:22px}h2{font-size:clamp(29px,3.5vw,42px);line-height:1.25;margin-bottom:16px}h3{font-size:20px;line-height:1.4;margin-bottom:10px}.lead{font-size:18px;color:var(--muted);line-height:1.9}.intro-note{border-left:3px solid var(--cyan);padding:10px 0 10px 25px;color:var(--muted)}.intro-note strong{display:block;color:var(--ink);font-size:23px;margin-bottom:8px}
.section{padding:88px 0;position:relative}.section-white{background:rgba(255,255,255,.78);border-top:1px solid rgba(219,224,223,.72);border-bottom:1px solid rgba(219,224,223,.72)}.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,430px);gap:45px;align-items:end;margin-bottom:35px}.section-head p{color:var(--muted);margin-bottom:0}.section-kicker{color:var(--cyan-dark);font-size:14px;font-weight:800;margin-bottom:10px}
.scope-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.scope-item{padding:25px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease)}.scope-item:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:var(--shadow-sm)}.scope-index{color:var(--cyan-dark);font-size:13px;font-weight:800;margin-bottom:19px}.scope-item p{color:var(--muted);font-size:15px;margin:0}.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:19px}.tag{display:inline-flex;padding:4px 9px;border-radius:6px;background:var(--surface-soft);color:var(--muted);font-size:12px;font-weight:700}
.test-band{background:var(--dark);color:#fff}.test-band .section-head p,.test-band .muted{color:#acb7b8}.test-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}.test-grid img{width:100%;height:370px;object-fit:cover;border-radius:var(--radius-lg);filter:saturate(.8)}.test-list{display:grid;gap:12px;margin-top:24px}.test-list div{display:flex;gap:14px;align-items:flex-start;padding:15px 0;border-bottom:1px solid rgba(255,255,255,.14)}.test-list b{color:var(--cyan);font-size:14px;min-width:72px}
.gates{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.gate{min-height:190px;padding:24px 20px;border-right:1px solid var(--line);position:relative}.gate:last-child{border-right:0}.gate:before{content:"";display:block;width:12px;height:12px;border:3px solid var(--cyan);border-radius:50%;background:var(--bg);margin-bottom:24px}.gate strong{display:block;font-size:18px;margin-bottom:10px}.gate p{font-size:14px;color:var(--muted);margin:0}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.metric{padding:27px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm)}.metric strong{font-size:36px;line-height:1;color:var(--ink);display:block}.metric strong em{font-size:18px;font-style:normal;color:var(--cyan-dark)}.metric span{display:block;margin-top:12px;color:var(--muted);font-size:14px}.fineprint{font-size:13px;color:var(--weak);margin-top:18px}
.report-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:20px}.report-card{padding:29px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md)}.report-card.dark{background:var(--dark-2);color:#fff;border-color:#273235}.report-card p{color:var(--muted)}.report-card.dark p{color:#aeb9ba}.report-lines{display:grid;gap:10px;margin-top:23px}.report-lines span{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px}.report-lines span:last-child{border:0}.report-lines b{color:var(--cyan-dark)}
.faq-list{max-width:900px;border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;text-align:left;padding:21px 0;color:var(--ink);font-weight:800;font-size:17px}.faq-question i{font-style:normal;color:var(--cyan-dark);font-size:24px;transition:transform var(--ease)}.faq-answer{display:none;color:var(--muted);padding:0 45px 22px 0}.faq-item.open .faq-answer{display:block}.faq-item.open .faq-question i{transform:rotate(45deg)}
.cta{padding:70px 0;background:var(--cyan)}.cta-grid{display:flex;justify-content:space-between;align-items:center;gap:35px}.cta h2{margin:0;max-width:700px}.cta p{margin:10px 0 0;color:#13494c}.contact-form{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;max-width:640px}.contact-form input,.contact-form select{min-height:48px;border-color:rgba(7,16,18,.2)}.contact-form .full{grid-column:1/-1}.contact-form button{width:max-content}
.site-footer{padding:62px 0 24px;background:var(--dark);color:#fff}.footer-grid{display:grid;grid-template-columns:1.35fr .8fr 1fr 1fr;gap:40px}.footer-brand{font-size:20px;font-weight:850;margin-bottom:14px}.site-footer p{color:#aeb9ba;font-size:14px;margin:0}.footer-title{font-weight:800;margin-bottom:15px}.footer-links{display:grid;gap:8px;color:#aeb9ba;font-size:14px}.footer-links a:hover{color:var(--cyan)}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.14);margin-top:45px;padding-top:20px;color:#819092;font-size:13px}
@media(max-width:1200px){.nav-menu{gap:0}.nav-link{padding:0 8px;font-size:13px}.intro-grid{gap:45px}}
@media(max-width:992px){.nav-menu{position:absolute;left:24px;right:24px;top:calc(100% + 1px);display:none;padding:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 14px 14px}.nav-menu.is-open{display:grid}.nav-link{width:100%;padding:0 14px}.menu-toggle{display:block}.nav-actions .btn{display:none}.scope-grid{grid-template-columns:repeat(2,1fr)}.test-grid,.report-layout{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.container{width:min(calc(100% - 32px),var(--container))}.topbar-inner{padding:8px 0}.topbar-list:last-child{display:none}.page-intro{padding:58px 0 48px}.intro-grid,.section-head{grid-template-columns:1fr;gap:18px}.section{padding:64px 0}.gates{grid-template-columns:1fr 1fr}.gate:nth-child(2n){border-right:0}.gate{border-bottom:1px solid var(--line)}.metrics{grid-template-columns:repeat(2,1fr)}.cta-grid{display:grid}.footer-grid{gap:28px}.footer-bottom{display:grid;gap:5px}}
@media(max-width:520px){h1{font-size:38px}.brand{font-size:16px}.brand-mark{width:38px;height:38px}.scope-grid{grid-template-columns:1fr}.gates{grid-template-columns:1fr}.gate,.gate:nth-child(2n){border-right:0}.metrics{grid-template-columns:1fr 1fr}.metric strong{font-size:29px}.contact-form{grid-template-columns:1fr}.contact-form .full{grid-column:auto}.footer-grid{grid-template-columns:1fr}.test-grid img{height:245px}.topbar{font-size:12px}}
@media(max-width:375px){.container{width:calc(100% - 28px)}h1{font-size:34px}.metrics{gap:8px}.metric{padding:20px 14px}}