/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
      --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
      --dark-card: #0b0f19;
      --dark-card-border: rgba(255, 255, 255, 0.12);
      --bg-body: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #94a3b8;
      --brand-indigo: #6366f1;
      --brand-cyan: #06b6d4;
      --brand-amber: #f59e0b;
      --brand-emerald: #10b981;
      --border-soft: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 25px 35px -5px rgba(99, 102, 241, 0.18);
      --radius-sm: 10px;
      --radius-md: 18px;
      --radius-lg: 28px;
      --radius-full: 9999px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部双行导航 */
    .top-announce-bar {
      background: #0f172a;
      color: #94a3b8;
      font-size: 12px;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-announce-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-tag {
      background: rgba(99, 102, 241, 0.25);
      color: #818cf8;
      padding: 2px 8px;
      border-radius: var(--radius-full);
      font-weight: 600;
      margin-right: 8px;
    }
    .top-links {
      display: flex;
      gap: 18px;
    }
    .top-links span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }
    .main-header.scrolled {
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .site-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.28rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: var(--primary-gradient);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-item a {
      font-size: 0.95rem;
      font-weight: 600;
      color: #334155;
      padding: 8px 2px;
      position: relative;
    }
    .nav-item a:hover {
      color: var(--brand-indigo);
    }
    .nav-item a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--brand-indigo);
      transition: var(--transition);
      border-radius: 2px;
    }
    .nav-item a:hover::after {
      width: 100%;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .btn-gradient {
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 11px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.94rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 18px -4px rgba(99, 102, 241, 0.4);
      transition: var(--transition);
      min-height: 44px;
    }
    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.55);
    }
    .btn-outline {
      background: transparent;
      color: #0f172a;
      border: 1px solid #cbd5e1;
      padding: 11px 22px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.94rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
      transition: var(--transition);
      min-height: 44px;
    }
    .btn-outline:hover {
      border-color: #0f172a;
      background: #f1f5f9;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: #0f172a;
      padding: 6px;
      min-height: 44px;
      min-width: 44px;
    }

    /* 视觉徽章 */
    .data-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      background: rgba(99, 102, 241, 0.08);
      border: 1px solid rgba(99, 102, 241, 0.2);
      color: var(--brand-indigo);
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .data-badge-pulse {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand-indigo);
      box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7);
      animation: pulse-dot 2s infinite;
    }
    @keyframes pulse-dot {
      0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6); }
      70% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
      100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
    }

    /* 板块通用头部 */
    .section-head {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 56px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块通用样式 */
    section {
      padding: 90px 0;
      position: relative;
    }

    /* 板块 1: 全宽沉浸 KV Hero */
    .hero-section {
      padding: 40px 0 90px;
      background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
      overflow: hidden;
    }
    .hero-banner {
      position: relative;
      border-radius: var(--radius-lg);
      background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.75) 50%, rgba(15, 23, 42, 0.55) 100%), url('/assets/images/8ced06e305191de9.webp');
      background-size: cover;
      background-position: center;
      padding: 70px 60px;
      color: #ffffff;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .hero-content {
      max-width: 720px;
      position: relative;
      z-index: 2;
    }
    .hero-badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 22px;
    }
    .hero-pill {
      background: rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      padding: 6px 16px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #38bdf8;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.15;
      margin-bottom: 22px;
      letter-spacing: -1px;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .hero-title span {
      background: linear-gradient(135deg, #a5b4fc, #38bdf8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.12rem;
      color: #cbd5e1;
      line-height: 1.8;
      margin-bottom: 34px;
    }
    .hero-countdown-box {
      background: rgba(15, 23, 42, 0.65);
      border: 1px solid rgba(255, 255, 255, 0.18);
      border-radius: var(--radius-md);
      padding: 16px 24px;
      display: inline-flex;
      align-items: center;
      gap: 20px;
      margin-bottom: 36px;
      backdrop-filter: blur(10px);
    }
    .countdown-label {
      font-size: 0.88rem;
      color: #94a3b8;
    }
    .countdown-timer {
      display: flex;
      gap: 10px;
    }
    .countdown-item {
      background: rgba(255, 255, 255, 0.1);
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 800;
      font-size: 1.1rem;
      color: #f59e0b;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-btn-primary {
      background: var(--primary-gradient);
      color: #fff;
      padding: 15px 36px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      box-shadow: 0 10px 25px rgba(99, 102, 241, 0.5);
      display: inline-flex;
      align-items: center;
      gap: 10px;
      min-height: 48px;
    }
    .hero-btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(99, 102, 241, 0.65);
    }
    .hero-btn-glass {
      background: rgba(255, 255, 255, 0.15);
      color: #fff;
      border: 1px solid rgba(255, 255, 255, 0.35);
      padding: 15px 30px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      backdrop-filter: blur(8px);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 48px;
    }
    .hero-btn-glass:hover {
      background: rgba(255, 255, 255, 0.28);
    }

    /* 板块 2: 指标看板与全网算力条 (#metrics) */
    .metrics-section {
      background: #ffffff;
      padding: 60px 0;
      border-bottom: 1px solid var(--border-soft);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: left;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .metric-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--brand-emerald);
      margin-bottom: 10px;
    }
    .metric-num {
      font-size: 2.6rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.1;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #0f172a 0%, #3b82f6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .metric-label {
      font-size: 0.95rem;
      font-weight: 700;
      color: #334155;
      margin-bottom: 6px;
    }
    .metric-desc {
      font-size: 0.84rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 3: 产线能力与自研渲染引擎 (#engine) */
    .engine-section {
      background: #f8fafc;
    }
    .engine-layout {
      display: grid;
      grid-template-columns: 1fr 1.05fr;
      gap: 56px;
      align-items: center;
    }
    .engine-content h3 {
      font-size: 1.85rem;
      font-weight: 800;
      margin-bottom: 18px;
      line-height: 1.35;
      color: #0f172a;
    }
    .engine-p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 1rem;
      line-height: 1.75;
    }
    .engine-specs {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 30px;
    }
    .spec-item {
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
    }
    .spec-title {
      font-size: 0.92rem;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 4px;
    }
    .spec-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .engine-visual {
      position: relative;
    }
    .engine-img-frame {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(0,0,0,0.15);
      border: 4px solid #ffffff;
      background: #e2e8f0;
    }
    .engine-floating-badge {
      position: absolute;
      bottom: -18px;
      left: 24px;
      background: #0f172a;
      color: #ffffff;
      padding: 14px 22px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      gap: 14px;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .badge-stat {
      font-size: 1.6rem;
      font-weight: 800;
      color: #38bdf8;
    }

    /* 板块 4: 六维核心优势矩阵 (#features) */
    .features-section {
      background: #ffffff;
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      padding: 34px 28px;
      position: relative;
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(99, 102, 241, 0.3);
      background: #ffffff;
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(6, 182, 212, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--brand-indigo);
      margin-bottom: 20px;
    }
    .feature-card-tag {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--brand-indigo);
      background: rgba(99, 102, 241, 0.08);
      padding: 3px 10px;
      border-radius: var(--radius-full);
    }
    .feature-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 12px;
    }
    .feature-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 5: 热门 AI 视频生成服务矩阵 (#products) */
    .products-section {
      background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      align-items: stretch;
    }
    .product-tier-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid #e2e8f0;
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .product-tier-card.featured {
      border: 2px solid var(--brand-indigo);
      transform: scale(1.03);
      box-shadow: 0 20px 40px -10px rgba(99, 102, 241, 0.2);
    }
    .featured-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 4px 18px;
      border-radius: var(--radius-full);
      font-size: 0.8rem;
      font-weight: 800;
      letter-spacing: 0.5px;
    }
    .tier-header {
      margin-bottom: 24px;
      text-align: center;
    }
    .tier-name {
      font-size: 1.45rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .tier-price-box {
      background: #f8fafc;
      padding: 18px;
      border-radius: var(--radius-md);
      text-align: center;
      margin-bottom: 24px;
    }
    .price-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: #0f172a;
    }
    .price-unit {
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .tier-list {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .tier-list li {
      font-size: 0.92rem;
      color: #334155;
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
      border-bottom: 1px dashed #f1f5f9;
    }
    .tier-list li::before {
      content: '✓';
      color: var(--brand-emerald);
      font-weight: 800;
    }

    /* 板块 6: 传统与 AI 视频生成结果对比 (#comparison) */
    .comparison-section {
      background: #ffffff;
    }
    .comparison-table-wrap {
      background: #f8fafc;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-soft);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comp-table th, .comp-table td {
      padding: 20px 24px;
      font-size: 0.95rem;
    }
    .comp-table th {
      background: #0f172a;
      color: #ffffff;
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    .comp-table th.highlight {
      background: var(--primary-gradient);
    }
    .comp-table tr {
      border-bottom: 1px solid #e2e8f0;
      transition: var(--transition);
    }
    .comp-table tr:hover {
      background: #f1f5f9;
    }
    .comp-dim {
      font-weight: 700;
      color: #0f172a;
      width: 25%;
    }
    .comp-trad {
      color: #64748b;
      width: 37.5%;
      background: rgba(241, 245, 249, 0.4);
    }
    .comp-ai {
      color: #0f172a;
      font-weight: 600;
      width: 37.5%;
      background: rgba(99, 102, 241, 0.04);
    }
    .tag-neg {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      background: #fee2e2;
      color: #ef4444;
      font-size: 0.8rem;
      font-weight: 700;
      margin-right: 6px;
    }
    .tag-pos {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      background: #dcfce7;
      color: #10b981;
      font-size: 0.8rem;
      font-weight: 700;
      margin-right: 6px;
    }

    /* 板块 7: 深色沉浸式案例展厅 (#cases) */
    .cases-section {
      background: #0b0f19;
      color: #ffffff;
      padding: 100px 0;
    }
    .cases-section .section-title {
      color: #ffffff;
    }
    .cases-section .section-desc {
      color: #94a3b8;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #111827;
      border: 1px solid var(--dark-card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-6px);
      border-color: rgba(99, 102, 241, 0.4);
      box-shadow: 0 20px 30px rgba(0, 0, 0, 0.5);
    }
    .case-media-box {
      position: relative;
      aspect-ratio: 16/10;
      background: #1f2937;
      overflow: hidden;
    }
    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.6s ease;
    }
    .case-card:hover .case-media-box img {
      transform: scale(1.08);
    }
    .case-play-btn {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 48px;
      height: 48px;
      background: rgba(15, 23, 42, 0.7);
      backdrop-filter: blur(8px);
      border-radius: 50%;
      border: 1px solid rgba(255, 255, 255, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #38bdf8;
      font-size: 18px;
      transition: var(--transition);
    }
    .case-card:hover .case-play-btn {
      background: var(--brand-indigo);
      color: #ffffff;
      transform: translate(-50%, -50%) scale(1.1);
    }
    .case-info {
      padding: 22px 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-tag {
      font-size: 0.78rem;
      color: #38bdf8;
      font-weight: 700;
      margin-bottom: 8px;
      display: inline-block;
    }
    .case-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: #f8fafc;
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .case-meta {
      background: rgba(255, 255, 255, 0.05);
      border-radius: var(--radius-sm);
      padding: 8px 12px;
      font-size: 0.8rem;
      color: #94a3b8;
      display: flex;
      justify-content: space-between;
    }

    /* 板块 8: 多行业商业场景卡 (#scenarios) */
    .scenarios-section {
      background: #f8fafc;
    }
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 30px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .scenario-icon {
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .scenario-title {
      font-size: 1.2rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 10px;
    }
    .scenario-p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }
    .scenario-kpi {
      font-size: 0.82rem;
      color: var(--brand-indigo);
      font-weight: 700;
      background: #eef2ff;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    /* 板块 9: 技术演进路线与模型里程碑 (#timeline) */
    .timeline-section {
      background: #ffffff;
    }
    .timeline-wrap {
      max-width: 900px;
      margin: 0 auto;
      position: relative;
    }
    .timeline-wrap::before {
      content: '';
      position: absolute;
      left: 50%;
      top: 0;
      bottom: 0;
      width: 2px;
      background: #e2e8f0;
      transform: translateX(-50%);
    }
    .timeline-item {
      display: flex;
      justify-content: flex-end;
      padding-right: 50px;
      position: relative;
      margin-bottom: 40px;
      width: 50%;
    }
    .timeline-item:nth-child(even) {
      align-self: flex-end;
      margin-left: auto;
      justify-content: flex-start;
      padding-right: 0;
      padding-left: 50px;
    }
    .timeline-node {
      position: absolute;
      right: -9px;
      top: 20px;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #ffffff;
      border: 4px solid var(--brand-indigo);
      z-index: 2;
    }
    .timeline-item:nth-child(even) .timeline-node {
      right: auto;
      left: -9px;
    }
    .timeline-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      width: 100%;
      box-shadow: var(--shadow-sm);
    }
    .timeline-ver {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--brand-indigo);
      margin-bottom: 6px;
    }
    .timeline-heading {
      font-size: 1.15rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 8px;
    }
    .timeline-txt {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 10: 平台权威保障与企业级版权安全 (#security) */
    .security-section {
      background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    }
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .security-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .sec-icon {
      width: 56px;
      height: 56px;
      margin: 0 auto 18px;
      background: #ecfdf5;
      color: var(--brand-emerald);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 900;
    }
    .sec-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 8px;
    }
    .sec-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 11: 行业客户真实评价与口碑网格 (#testimonials) */
    .testimonials-section {
      background: #f8fafc;
    }
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: #f59e0b;
      margin-bottom: 14px;
      font-size: 1.1rem;
    }
    .testi-quote {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .author-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }
    .author-name {
      font-size: 0.95rem;
      font-weight: 800;
      color: #0f172a;
    }
    .author-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 板块 12: 资讯前沿与行业动态 (#news) */
    .news-section {
      background: #ffffff;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .news-cover {
      height: 190px;
      overflow: hidden;
      background: #e2e8f0;
    }
    .news-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .news-card:hover .news-cover img {
      transform: scale(1.06);
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--brand-indigo);
      font-weight: 700;
      margin-bottom: 10px;
    }
    .news-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.45;
      margin-bottom: 12px;
    }
    .news-excerpt {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 板块 13: 常见问题解答手风琴 (#faq) */
    .faq-section {
      background: #f8fafc;
    }
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: rgba(99, 102, 241, 0.4);
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.08);
    }
    .faq-trigger {
      width: 100%;
      padding: 20px 24px;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.05rem;
      font-weight: 800;
      color: #0f172a;
      text-align: left;
    }
    .faq-icon {
      font-size: 1.3rem;
      color: var(--brand-indigo);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-body {
      padding: 0 24px 22px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.75;
      display: none;
    }
    .faq-item.active .faq-body {
      display: block;
    }

    /* 板块 14: 询盘转化与算力体验表单 (#contact) */
    .contact-section {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      padding: 90px 0;
    }
    .contact-card-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 56px;
      backdrop-filter: blur(16px);
    }
    .contact-left h3 {
      font-size: 2.1rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .contact-left p {
      color: #cbd5e1;
      font-size: 1.02rem;
      line-height: 1.75;
      margin-bottom: 30px;
    }
    .contact-perks {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .contact-perks li {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #94a3b8;
      font-size: 0.95rem;
    }
    .contact-perks li span {
      color: #38bdf8;
      font-weight: 800;
    }
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.85rem;
      color: #cbd5e1;
      font-weight: 600;
    }
    .form-input {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #ffffff;
      font-size: 0.95rem;
      transition: var(--transition);
      min-height: 46px;
    }
    .form-input:focus {
      border-color: #38bdf8;
      background: rgba(255, 255, 255, 0.12);
    }
    .form-submit-btn {
      margin-top: 10px;
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 14px 28px;
      border-radius: var(--radius-full);
      font-weight: 800;
      font-size: 1.05rem;
      border: none;
      cursor: pointer;
      box-shadow: 0 10px 25px rgba(99, 102, 241, 0.5);
      transition: var(--transition);
      min-height: 48px;
    }
    .form-submit-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(99, 102, 241, 0.7);
    }
    .form-privacy-note {
      font-size: 0.78rem;
      color: #64748b;
      text-align: center;
      margin-top: 4px;
    }

    /* 全局页脚 Footer */
    .site-footer {
      background: #090d16;
      color: #94a3b8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand-title {
      font-size: 1.3rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .footer-p {
      line-height: 1.7;
      margin-bottom: 20px;
      color: #64748b;
    }
    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #38bdf8;
    }
    .footer-bottom-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
      color: #64748b;
    }
    .footer-bottom-bar a {
      color: #64748b;
    }
    .footer-bottom-bar a:hover {
      color: #cbd5e1;
    }

    /* 移动端菜单抽屉 */
    .mobile-drawer {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(15, 23, 42, 0.96);
      backdrop-filter: blur(16px);
      z-index: 2000;
      padding: 30px 24px;
      flex-direction: column;
    }
    .mobile-drawer.open {
      display: flex;
    }
    .mobile-drawer-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 40px;
    }
    .mobile-drawer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .mobile-drawer-links a {
      color: #ffffff;
      font-size: 1.25rem;
      font-weight: 700;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.4rem; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .engine-layout { grid-template-columns: 1fr; gap: 40px; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .products-grid { grid-template-columns: 1fr; }
      .product-tier-card.featured { transform: none; }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
      .timeline-wrap::before { left: 20px; }
      .timeline-item { width: 100%; padding-left: 50px; padding-right: 0; justify-content: flex-start; }
      .timeline-item:nth-child(even) { padding-left: 50px; }
      .timeline-node, .timeline-item:nth-child(even) .timeline-node { left: 11px; right: auto; }
      .security-grid { grid-template-columns: repeat(2, 1fr); }
      .testi-grid { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .contact-card-box { grid-template-columns: 1fr; padding: 36px 24px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .top-announce-inner { justify-content: center; }
      .top-links { display: none; }
      .nav-menu { display: none; }
      .nav-cta .btn-gradient { display: none; }
      .mobile-toggle { display: block; }
      .hero-banner { padding: 40px 24px; }
      .hero-title { font-size: 1.95rem; }
      .metrics-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .scenarios-grid { grid-template-columns: 1fr; }
      .security-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .comp-table th, .comp-table td { padding: 14px; font-size: 0.85rem; }
    }