/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-light: #1E293B;
      --accent: #00D084;
      --accent-glow: rgba(0, 208, 132, 0.25);
      --secondary: #38BDF8;
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --bg-dark: #090D16;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 12px 24px -10px rgba(0, 208, 132, 0.15);
      --container-max: 1200px;
      --font-stack: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      font-family: var(--font-stack);
      scroll-behavior: smooth;
      background-color: var(--bg-white);
      color: var(--text-main);
      -webkit-font-smoothing: antialiased;
    }

    body {
      line-height: 1.7;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section-py {
      padding-top: 84px;
      padding-bottom: 84px;
    }

    .section-header {
      margin-bottom: 48px;
    }
    .section-header.center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      background-color: rgba(0, 208, 132, 0.08);
      padding: 4px 12px;
      border-radius: 9999px;
      margin-bottom: 14px;
      letter-spacing: 0.04em;
    }
    .section-tag::before {
      content: "";
      width: 6px;
      height: 6px;
      background: var(--accent);
      border-radius: 50%;
    }
    .section-title {
      font-size: 32px;
      line-height: 1.3;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 600;
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #042517;
      box-shadow: 0 4px 14px var(--accent-glow);
    }
    .btn-primary:hover {
      background-color: #00bc77;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 208, 132, 0.35);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--primary);
      background-color: #FFFFFF;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: var(--bg-light);
      transform: translateY(-2px);
    }
    .btn-dark {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .btn-dark:hover {
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }

    /* Topbar & Header */
    .topbar {
      background-color: #0B1120;
      color: var(--text-light);
      font-size: 12px;
      border-bottom: 1px solid var(--border-dark);
      padding: 8px 0;
    }
    .topbar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-indicator {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 rgba(0, 208, 132, 0.6);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(0, 208, 132, 0.7); }
      70% { box-shadow: 0 0 0 8px rgba(0, 208, 132, 0); }
      100% { box-shadow: 0 0 0 0 rgba(0, 208, 132, 0); }
    }

    .site-header {
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 18px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.01em;
    }
    .logo-badge {
      background: linear-gradient(135deg, var(--primary) 0%, #1e293b 100%);
      color: var(--accent);
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 16px;
      font-weight: 900;
      border: 1px solid rgba(0, 208, 132, 0.3);
    }
    .main-nav ul {
      display: flex;
      list-style: none;
      gap: 28px;
    }
    .main-nav a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
    }
    .main-nav a:hover,
    .main-nav a.active {
      color: var(--accent);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* Section 1: Hero Section (Before / After Comparison) */
    .hero-section {
      background: linear-gradient(180deg, #090D16 0%, #0F172A 100%);
      color: #FFFFFF;
      padding: 80px 0 96px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.08), transparent 40%),
                        radial-gradient(circle at 20% 80%, rgba(0, 208, 132, 0.08), transparent 45%);
      pointer-events: none;
    }
    .hero-intro {
      text-align: center;
      max-width: 900px;
      margin: 0 auto 56px;
      position: relative;
      z-index: 1;
    }
    .hero-intro h1 {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-intro h1 span {
      color: var(--accent);
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-light);
      max-width: 820px;
      margin: 0 auto 28px;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
    }
    .comparison-stage {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      position: relative;
      z-index: 2;
    }
    .compare-card {
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .compare-card.before {
      background-color: rgba(30, 41, 59, 0.4);
      border-color: rgba(148, 163, 184, 0.15);
    }
    .compare-card.after {
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.8) 0%, rgba(11, 23, 36, 0.95) 100%);
      border-color: rgba(0, 208, 132, 0.4);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 0 20px rgba(0, 208, 132, 0.05);
    }
    .compare-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .badge-before {
      background-color: rgba(239, 68, 68, 0.15);
      color: #F87171;
      border: 1px solid rgba(239, 68, 68, 0.3);
    }
    .badge-after {
      background-color: rgba(0, 208, 132, 0.15);
      color: var(--accent);
      border: 1px solid rgba(0, 208, 132, 0.4);
    }
    .compare-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 14px;
      color: #FFFFFF;
    }
    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 14px;
      font-size: 14px;
      color: var(--text-light);
    }
    .compare-list li {
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }
    .compare-list li svg {
      flex-shrink: 0;
      margin-top: 4px;
    }

    /* Section 2: Metrics Dashboard */
    .metrics-section {
      background-color: #0B1120;
      border-bottom: 1px solid var(--border-dark);
      padding: 48px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-item {
      padding: 20px;
      border-left: 2px solid rgba(0, 208, 132, 0.3);
      background-color: rgba(255, 255, 255, 0.02);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: #FFFFFF;
      font-variant-numeric: tabular-nums;
      line-height: 1;
      margin-bottom: 8px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .metric-unit {
      font-size: 16px;
      color: var(--accent);
      font-weight: 600;
    }
    .metric-label {
      font-size: 13px;
      font-weight: 600;
      color: #CBD5E1;
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Section 3: Dual Column Layout (Left: News Stream, Right: Hot Topic / Entrances) */
    .flow-layout-section {
      background-color: var(--bg-white);
    }
    .dual-stream-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 48px;
      align-items: start;
    }
    .news-stream-card {
      display: flex;
      gap: 20px;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      margin-bottom: 20px;
      transition: all 0.25s ease;
      background-color: #FFFFFF;
    }
    .news-stream-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .news-stream-img {
      width: 180px;
      height: 120px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      flex-shrink: 0;
    }
    .news-stream-content {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-meta-row {
      display: flex;
      gap: 12px;
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 6px;
      align-items: center;
    }
    .news-category-badge {
      background-color: var(--bg-light);
      color: var(--primary);
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 4px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.4;
      margin-bottom: 8px;
    }
    .news-snippet {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .hot-rank-panel {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      background-color: var(--bg-light);
    }
    .hot-rank-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 2px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .hot-rank-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .hot-rank-item {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }
    .hot-rank-index {
      width: 24px;
      height: 24px;
      border-radius: 4px;
      background-color: #E2E8F0;
      color: var(--text-main);
      font-size: 12px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .hot-rank-item:nth-child(1) .hot-rank-index {
      background-color: var(--accent);
      color: #042517;
    }
    .hot-rank-item:nth-child(2) .hot-rank-index {
      background-color: var(--secondary);
      color: #082F49;
    }
    .hot-rank-item:nth-child(3) .hot-rank-index {
      background-color: #94A3B8;
      color: #FFFFFF;
    }
    .hot-rank-info {
      flex: 1;
    }
    .hot-rank-name {
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      line-height: 1.4;
      margin-bottom: 4px;
    }
    .hot-rank-stat {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 4: Special Topic Strip (专题条) */
    .topic-strip-section {
      background-color: var(--primary);
      color: #FFFFFF;
      padding: 64px 0;
      position: relative;
    }
    .topic-strip-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      background: linear-gradient(90deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.9) 100%);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 40px;
    }
    .topic-strip-text h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 12px;
      color: #FFFFFF;
    }
    .topic-strip-text p {
      font-size: 15px;
      color: var(--text-light);
      max-width: 640px;
      line-height: 1.7;
    }

    /* Section 5: Core Advantages Grid */
    .advantages-section {
      background-color: var(--bg-light);
    }
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.25s ease;
      position: relative;
      overflow: hidden;
    }
    .advantage-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }
    .advantage-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background-color: transparent;
      transition: background-color 0.25s ease;
    }
    .advantage-card:hover::before {
      background-color: var(--accent);
    }
    .adv-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background-color: rgba(0, 208, 132, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
    }
    .adv-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .adv-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 6: Service Matrix Section */
    .matrix-section {
      background-color: var(--bg-white);
    }
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .matrix-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      background-color: #FFFFFF;
      transition: all 0.25s ease;
    }
    .matrix-card:hover {
      box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
      border-color: #CBD5E1;
    }
    .matrix-card-header {
      padding: 30px;
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }
    .matrix-card-title {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .matrix-card-subtitle {
      font-size: 13px;
      color: var(--text-muted);
    }
    .matrix-card-body {
      padding: 30px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .matrix-spec-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 28px;
    }
    .matrix-spec-item {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .matrix-spec-item svg {
      color: var(--accent);
      flex-shrink: 0;
    }

    /* Section 7: Deep Architecture Section (Philosophy & Technical Flow) */
    .arch-section {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .arch-info h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 18px;
      color: #FFFFFF;
    }
    .arch-info p {
      font-size: 15px;
      color: var(--text-light);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .arch-step-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .arch-step {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      background-color: rgba(255, 255, 255, 0.03);
      padding: 16px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--secondary);
    }
    .arch-step-num {
      font-size: 14px;
      font-weight: 800;
      color: var(--secondary);
    }
    .arch-step-text h4 {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 4px;
    }
    .arch-step-text p {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 0;
      line-height: 1.6;
    }
    .arch-visual {
      background-color: rgba(15, 23, 42, 0.7);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .code-mock {
      font-family: monospace;
      font-size: 13px;
      color: #38BDF8;
      line-height: 1.6;
      background-color: #020617;
      padding: 20px;
      border-radius: var(--radius-sm);
      overflow-x: auto;
      border: 1px solid #1E293B;
    }

    /* Section 8: Technical Milestones (里程碑) */
    .milestone-section {
      background-color: var(--bg-light);
    }
    .timeline-wrap {
      position: relative;
      max-width: 860px;
      margin: 0 auto;
    }
    .timeline-wrap::before {
      content: "";
      position: absolute;
      top: 0;
      bottom: 0;
      left: 20px;
      width: 2px;
      background-color: var(--border-color);
    }
    .timeline-node {
      position: relative;
      padding-left: 60px;
      margin-bottom: 40px;
    }
    .timeline-node:last-child {
      margin-bottom: 0;
    }
    .timeline-dot {
      position: absolute;
      left: 11px;
      top: 4px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background-color: #FFFFFF;
      border: 4px solid var(--accent);
      box-shadow: 0 0 0 4px rgba(0, 208, 132, 0.2);
    }
    .timeline-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .timeline-date {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      background-color: rgba(0, 208, 132, 0.1);
      padding: 2px 10px;
      border-radius: 4px;
      margin-bottom: 8px;
    }
    .timeline-heading {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .timeline-content {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 9: Scenario Stories (用户故事与应用场景) */
    .scenario-section {
      background-color: var(--bg-white);
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .scenario-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      background-color: #FFFFFF;
      display: flex;
      flex-direction: column;
    }
    .scenario-img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .scenario-body {
      padding: 28px;
    }
    .scenario-role {
      font-size: 13px;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 6px;
    }
    .scenario-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .scenario-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 10: Platform Guarantee & Trust Backing (平台保障与背书) */
    .guarantee-section {
      background-color: var(--bg-light);
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
    }
    .guarantee-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background-color: rgba(56, 189, 248, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
    }
    .guarantee-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .guarantee-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 11: Media Collaboration & Client Voice (媒体合作与评价) */
    .testimonials-section {
      background-color: var(--bg-white);
    }
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      background-color: var(--bg-light);
      position: relative;
    }
    .testi-quote {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.75;
      margin-bottom: 20px;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testi-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background-color: var(--primary);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .testi-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }
    .testi-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 12: Accordion FAQ (常见解答) */
    .faq-section {
      background-color: var(--bg-light);
    }
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    .faq-item {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-item.active {
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .faq-header {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--text-muted);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.8;
    }
    .faq-item.active .faq-body {
      max-height: 240px;
      padding-bottom: 20px;
    }

    /* Section 13: Conversion Form & SLA Commitment (转化与保障区) */
    .conversion-section {
      background-color: #0F172A;
      color: #FFFFFF;
      border-top: 1px solid var(--border-dark);
    }
    .conversion-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .conversion-info h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 16px;
      color: #FFFFFF;
      line-height: 1.3;
    }
    .conversion-info p {
      font-size: 15px;
      color: var(--text-light);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .sla-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: #CBD5E1;
    }
    .sla-list li {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .sla-list li::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--accent);
    }
    .contact-form {
      background-color: #1E293B;
      border: 1px solid #334155;
      border-radius: var(--radius-md);
      padding: 32px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
      color: #CBD5E1;
    }
    .form-input, .form-textarea {
      width: 100%;
      padding: 11px 14px;
      background-color: #0F172A;
      border: 1px solid #334155;
      border-radius: var(--radius-sm);
      color: #FFFFFF;
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .form-input:focus, .form-textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0, 208, 132, 0.15);
    }
    .form-textarea {
      resize: vertical;
      min-height: 84px;
    }

    /* Footer */
    .site-footer {
      background-color: #090D16;
      color: var(--text-light);
      font-size: 13px;
      border-top: 1px solid var(--border-dark);
      padding: 56px 0 28px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      font-size: 18px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand p {
      line-height: 1.7;
      max-width: 440px;
    }
    .footer-links h5 {
      font-size: 14px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 14px;
    }
    .footer-links ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid #1E293B;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      color: var(--text-muted);
      font-size: 12px;
    }

    /* Responsive Queries */
    @media (max-width: 1024px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3x2, .matrix-grid, .testi-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .dual-stream-grid {
        grid-template-columns: 1fr;
      }
      .arch-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .topbar { display: none; }
      .main-nav ul { display: none; }
      .hero-intro h1 { font-size: 28px; }
      .comparison-stage { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr; }
      .grid-3x2, .matrix-grid, .scenario-grid, .guarantee-grid, .testi-grid {
        grid-template-columns: 1fr;
      }
      .conversion-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .topic-strip-banner { flex-direction: column; text-align: left; }
      .news-stream-card { flex-direction: column; }
      .news-stream-img { width: 100%; height: 180px; }
      .section-py { padding-top: 56px; padding-bottom: 56px; }
    }