/* ===== 基础重置与变量 ===== */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --bg-base: #f7f9fc;
      --bg-gradient: linear-gradient(145deg, #f0f4ff 0%, #fdf5f0 40%, #f0faf5 100%);
      --text-dark: #1a2332;
      --text-body: #3b4a5e;
      --text-muted: #6b7c93;
      --brand-1: #4e6ef2;
      --brand-2: #e85d75;
      --brand-3: #26b8a6;
      --brand-4: #f0a84e;
      --brand-5: #8b5cf6;
      --card-bg: #ffffff;
      --card-border: #e6ecf4;
      --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.04);
      --shadow-md: 0 6px 24px rgba(26, 35, 50, 0.07);
      --shadow-lg: 0 16px 48px rgba(26, 35, 50, 0.1);
      --radius-sm: 10px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --container-max: 1200px;
      --container-pad: 20px;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      color: var(--text-body);
      background: var(--bg-base);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

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

    /* ===== 公共元素 ===== */
    a {
      color: inherit;
      text-decoration: none;
    }

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

    .ai-page-logo {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.06em;
      color: var(--brand-1);
      background: rgba(78, 110, 242, 0.08);
      padding: 6px 16px;
      border-radius: 100px;
      margin-bottom: 16px;
    }

    .section-title {
      font-size: clamp(24px, 3vw, 34px);
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: 100px;
      font-size: 15px;
      font-weight: 600;
      line-height: 1.4;
      border: none;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease;
      white-space: nowrap;
    }

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

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

    .btn-primary {
      background: linear-gradient(135deg, var(--brand-1), #6b5cf6);
      color: #ffffff;
      box-shadow: 0 6px 20px rgba(78, 110, 242, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 10px 28px rgba(78, 110, 242, 0.4);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--brand-2), #f0896b);
      color: #ffffff;
      box-shadow: 0 6px 20px rgba(232, 93, 117, 0.28);
    }

    .btn-accent:hover {
      box-shadow: 0 10px 28px rgba(232, 93, 117, 0.38);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-dark);
      border: 1.5px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }

    .btn-outline:hover {
      border-color: var(--brand-1);
      color: var(--brand-1);
    }

    /* ===== 滚动渐入 ===== */
    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    /* ===== 导航 ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(230, 236, 244, 0.7);
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 68px;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .nav-brand img {
      width: auto;
      max-height: 40px;
      object-fit: contain;
    }

    .nav-brand .brand-name {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      flex-wrap: nowrap;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      border-radius: 8px;
      transition: color 0.2s ease, background 0.2s ease;
      white-space: nowrap;
    }

    .nav-links li a:hover {
      color: var(--brand-1);
      background: rgba(78, 110, 242, 0.06);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .nav-actions .btn {
      padding: 9px 20px;
      font-size: 14px;
    }

    .menu-toggle {
      display: none;
      width: 40px;
      height: 40px;
      border: 1px solid var(--card-border);
      border-radius: 10px;
      background: #fff;
      cursor: pointer;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 5px;
    }

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: transform 0.25s ease, opacity 0.25s ease;
    }

    .menu-toggle.is-active span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .menu-toggle.is-active span:nth-child(2) {
      opacity: 0;
    }

    .menu-toggle.is-active span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* ===== Hero ===== */
    .hero {
      position: relative;
      padding: 88px 0 96px;
      background: var(--bg-gradient);
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: -30%;
      right: -10%;
      width: 600px;
      height: 600px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(78, 110, 242, 0.12), transparent 70%);
      pointer-events: none;
    }

    .hero::after {
      content: "";
      position: absolute;
      bottom: -20%;
      left: -8%;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(38, 184, 166, 0.1), transparent 70%);
      pointer-events: none;
    }

    .hero-inner {
      position: relative;
      z-index: 1;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
    }

    .hero-content {
      flex: 1 1 540px;
      max-width: 620px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 600;
      color: var(--brand-1);
      background: rgba(78, 110, 242, 0.08);
      border: 1px solid rgba(78, 110, 242, 0.16);
      padding: 6px 16px;
      border-radius: 100px;
      margin-bottom: 24px;
    }

    .hero-badge .dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--brand-3);
      animation: pulse 2s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.3); }
    }

    .hero h1 {
      font-size: clamp(30px, 4.2vw, 50px);
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.01em;
    }

    .hero h1 .highlight {
      background: linear-gradient(120deg, var(--brand-1), var(--brand-5) 50%, var(--brand-2));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .hero-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
      max-width: 540px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 40px;
    }

    .hero-actions .btn {
      padding: 14px 32px;
      font-size: 16px;
    }

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 32px;
    }

    .hero-stat-item {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .hero-stat-item strong {
      font-size: 26px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.02em;
    }

    .hero-stat-item strong em {
      font-style: normal;
      font-size: 15px;
      font-weight: 700;
      color: var(--brand-1);
      margin-left: 2px;
    }

    .hero-stat-item span {
      font-size: 13px;
      color: var(--text-muted);
    }

    .hero-visual {
      flex: 0 1 420px;
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .hero-float-card {
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.9);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      box-shadow: var(--shadow-md);
      animation: floatY 6s ease-in-out infinite;
    }

    .hero-float-card:nth-child(2) {
      animation-delay: -2s;
      margin-left: 32px;
    }

    .hero-float-card:nth-child(3) {
      animation-delay: -4s;
      margin-left: 12px;
    }

    @keyframes floatY {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
    }

    .hero-float-card .fc-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 10px;
    }

    .hero-float-card .fc-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .hero-float-card .fc-tag {
      font-size: 11px;
      font-weight: 600;
      color: var(--brand-3);
      background: rgba(38, 184, 166, 0.1);
      padding: 2px 10px;
      border-radius: 100px;
    }

    .hero-float-card .fc-bar {
      height: 7px;
      border-radius: 100px;
      background: #eef2f8;
      overflow: hidden;
    }

    .hero-float-card .fc-bar i {
      display: block;
      height: 100%;
      border-radius: 100px;
      background: linear-gradient(90deg, var(--brand-1), var(--brand-5));
      animation: barGrow 2.8s ease-out forwards;
      width: 0;
    }

    .hero-float-card:nth-child(2) .fc-bar i {
      background: linear-gradient(90deg, var(--brand-3), var(--brand-1));
    }

    .hero-float-card:nth-child(3) .fc-bar i {
      background: linear-gradient(90deg, var(--brand-4), var(--brand-2));
    }

    @keyframes barGrow {
      to { width: 88%; }
    }

    .hero-float-card:nth-child(2) .fc-bar i { animation-delay: 0.3s; }
    .hero-float-card:nth-child(3) .fc-bar i { animation-delay: 0.6s; }

    /* ===== 数据指标 ===== */
    .metrics-section {
      padding-top: 0;
      margin-top: -36px;
      position: relative;
      z-index: 2;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .metric-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .metric-card .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-card .metric-num em {
      font-style: normal;
      font-size: 15px;
      font-weight: 700;
      color: var(--brand-1);
      margin-left: 3px;
    }

    .metric-card .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* ===== 关于我们/平台介绍 ===== */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }

    .about-text h2 {
      font-size: clamp(24px, 2.8vw, 32px);
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .about-text p {
      font-size: 15px;
      color: var(--text-body);
      line-height: 1.85;
      margin-bottom: 16px;
    }

    .about-capabilities {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-top: 24px;
    }

    .cap-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      padding: 14px 16px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .cap-item:hover {
      border-color: var(--brand-1);
      box-shadow: 0 4px 14px rgba(78, 110, 242, 0.1);
    }

    .cap-item .cap-icon {
      flex-shrink: 0;
      width: 22px;
      height: 22px;
      border-radius: 6px;
      background: linear-gradient(135deg, var(--brand-1), var(--brand-5));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      margin-top: 1px;
    }

    .cap-item .cap-text {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-dark);
      line-height: 1.5;
    }

    .about-visual {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .about-visual .visual-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .about-visual .visual-card img {
      width: 100%;
      height: auto;
      display: block;
    }

    .about-visual .visual-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    /* ===== 服务能力卡片 ===== */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(78, 110, 242, 0.3);
    }

    .service-card .svc-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      flex-shrink: 0;
    }

    .service-card:nth-child(1) .svc-icon { background: rgba(78, 110, 242, 0.1); color: var(--brand-1); }
    .service-card:nth-child(2) .svc-icon { background: rgba(232, 93, 117, 0.1); color: var(--brand-2); }
    .service-card:nth-child(3) .svc-icon { background: rgba(38, 184, 166, 0.1); color: var(--brand-3); }
    .service-card:nth-child(4) .svc-icon { background: rgba(240, 168, 78, 0.1); color: var(--brand-4); }
    .service-card:nth-child(5) .svc-icon { background: rgba(139, 92, 246, 0.1); color: var(--brand-5); }
    .service-card:nth-child(6) .svc-icon { background: rgba(78, 110, 242, 0.1); color: var(--brand-1); }

    .service-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.4;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      flex: 1;
    }

    /* ===== 标签云 ===== */
    .tag-cloud-section {
      padding: 0 0 72px;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .tag-cloud span {
      display: inline-block;
      padding: 7px 18px;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-body);
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 100px;
      transition: all 0.2s ease;
      cursor: default;
    }

    .tag-cloud span:hover {
      border-color: var(--brand-1);
      color: var(--brand-1);
      background: rgba(78, 110, 242, 0.04);
      transform: translateY(-2px);
    }

    /* ===== 流程步骤 ===== */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: step;
    }

    .step-card {
      position: relative;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .step-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .step-card .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 18px;
      font-weight: 800;
      color: #fff;
      margin-bottom: 18px;
    }

    .step-card:nth-child(1) .step-num { background: linear-gradient(135deg, var(--brand-1), #6b5cf6); }
    .step-card:nth-child(2) .step-num { background: linear-gradient(135deg, var(--brand-2), #f0896b); }
    .step-card:nth-child(3) .step-num { background: linear-gradient(135deg, var(--brand-3), #4bd3ae); }
    .step-card:nth-child(4) .step-num { background: linear-gradient(135deg, var(--brand-4), var(--brand-2)); }

    .step-card h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* ===== 案例中心 ===== */
    .case-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 32px;
      align-items: start;
    }

    .case-large {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.25s ease;
    }

    .case-large:hover {
      box-shadow: var(--shadow-md);
    }

    .case-large .case-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #eef2f8;
    }

    .case-large .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-large:hover .case-img img {
      transform: scale(1.03);
    }

    .case-large .case-body {
      padding: 24px;
    }

    .case-large .case-body h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .case-large .case-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .case-side {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .case-small {
      display: flex;
      gap: 16px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 16px;
      align-items: center;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .case-small:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .case-small .cs-img {
      width: 100px;
      aspect-ratio: 1 / 1;
      border-radius: var(--radius-sm);
      overflow: hidden;
      flex-shrink: 0;
      background: #eef2f8;
    }

    .case-small .cs-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-small .cs-body h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 4px;
    }

    .case-small .cs-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* ===== 对比评测 ===== */
    .compare-section {
      background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
      border-top: 1px solid var(--card-border);
      border-bottom: 1px solid var(--card-border);
    }

    .compare-score-card {
      display: flex;
      align-items: center;
      gap: 32px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px 36px;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
    }

    .score-badge {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      flex-shrink: 0;
    }

    .score-badge .score-num {
      font-size: 48px;
      font-weight: 800;
      color: var(--brand-2);
      line-height: 1;
      letter-spacing: -0.03em;
    }

    .score-badge .score-max {
      font-size: 13px;
      color: var(--text-muted);
    }

    .score-stars {
      display: flex;
      gap: 3px;
      color: var(--brand-4);
      font-size: 18px;
    }

    .score-divider {
      width: 1px;
      height: 64px;
      background: var(--card-border);
      flex-shrink: 0;
    }

    .score-info h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .score-info p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .compare-table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--card-border);
      background: var(--card-bg);
      -webkit-overflow-scrolling: touch;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
      font-size: 14px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--card-border);
      vertical-align: middle;
    }

    .compare-table thead th {
      background: #f2f6fd;
      color: var(--text-dark);
      font-weight: 700;
      font-size: 13px;
      white-space: nowrap;
    }

    .compare-table tbody tr:last-child td {
      border-bottom: none;
    }

    .compare-table tbody tr:hover {
      background: #fafcff;
    }

    .compare-table .td-highlight {
      color: var(--brand-1);
      font-weight: 600;
    }

    .compare-table .td-check {
      color: var(--brand-3);
      font-weight: 600;
    }

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

    /* ===== 客户评论 ===== */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .review-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .review-stars {
      color: var(--brand-4);
      font-size: 14px;
      letter-spacing: 2px;
    }

    .review-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.75;
      flex: 1;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 10px;
      padding-top: 12px;
      border-top: 1px solid var(--card-border);
    }

    .review-avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      color: #fff;
      flex-shrink: 0;
    }

    .review-card:nth-child(1) .review-avatar { background: linear-gradient(135deg, var(--brand-1), var(--brand-5)); }
    .review-card:nth-child(2) .review-avatar { background: linear-gradient(135deg, var(--brand-2), var(--brand-4)); }
    .review-card:nth-child(3) .review-avatar { background: linear-gradient(135deg, var(--brand-3), var(--brand-1)); }
    .review-card:nth-child(4) .review-avatar { background: linear-gradient(135deg, var(--brand-4), var(--brand-2)); }
    .review-card:nth-child(5) .review-avatar { background: linear-gradient(135deg, var(--brand-5), var(--brand-3)); }
    .review-card:nth-child(6) .review-avatar { background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); }

    .review-user-info .name {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-dark);
      line-height: 1.4;
    }

    .review-user-info .role {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* ===== Token 比价 ===== */
    .token-section {
      background: linear-gradient(180deg, #f7f9fc 0%, #ffffff 100%);
      border-top: 1px solid var(--card-border);
    }

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

    .token-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .token-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .token-card .tc-model {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .token-card .tc-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      padding: 6px 0;
    }

    .token-card .tc-row .tc-label {
      color: var(--text-muted);
    }

    .token-card .tc-row .tc-val {
      font-weight: 600;
      color: var(--text-dark);
    }

    .token-card .tc-row .tc-val.saving {
      color: var(--brand-3);
    }

    .token-card .tc-bar {
      height: 6px;
      border-radius: 100px;
      background: #eef2f8;
      margin-top: 14px;
      overflow: hidden;
    }

    .token-card .tc-bar i {
      display: block;
      height: 100%;
      border-radius: 100px;
      background: linear-gradient(90deg, var(--brand-1), var(--brand-5));
    }

    .token-note {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 24px;
      line-height: 1.6;
    }

    /* ===== FAQ ===== */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .faq-item.is-open {
      border-color: rgba(78, 110, 242, 0.35);
      box-shadow: 0 4px 16px rgba(78, 110, 242, 0.08);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 22px;
      background: none;
      border: none;
      cursor: pointer;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-dark);
      text-align: left;
      font-family: inherit;
      line-height: 1.5;
      transition: color 0.2s ease;
    }

    .faq-question:hover {
      color: var(--brand-1);
    }

    .faq-question .faq-arrow {
      flex-shrink: 0;
      width: 20px;
      height: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      transition: transform 0.3s ease;
    }

    .faq-item.is-open .faq-question .faq-arrow {
      transform: rotate(180deg);
      color: var(--brand-1);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 22px;
    }

    .faq-item.is-open .faq-answer {
      max-height: 300px;
      padding: 0 22px 20px;
    }

    .faq-answer p {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
    }

    /* ===== 文章列表 ===== */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .article-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .article-card .ac-tag {
      align-self: flex-start;
      font-size: 11px;
      font-weight: 600;
      color: var(--brand-1);
      background: rgba(78, 110, 242, 0.08);
      padding: 3px 12px;
      border-radius: 100px;
    }

    .article-card h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.5;
    }

    .article-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
      flex: 1;
    }

    .article-card .ac-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--brand-1);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s ease;
    }

    .article-card:hover .ac-link {
      gap: 8px;
    }

    /* ===== 表单 ===== */
    .form-section {
      background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
    }

    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: start;
    }

    .form-intro h2 {
      font-size: clamp(24px, 2.8vw, 32px);
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .form-intro p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 28px;
    }

    .contact-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-item .ci-icon {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: rgba(78, 110, 242, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 18px;
    }

    .contact-item .ci-text {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .contact-item .ci-label {
      font-size: 12px;
      color: var(--text-muted);
    }

    .contact-item .ci-value {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-dark);
      word-break: break-all;
    }

    .form-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .form-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 24px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 11px 14px;
      font-size: 14px;
      font-family: inherit;
      color: var(--text-dark);
      background: #f8fafd;
      border: 1px solid var(--card-border);
      border-radius: 10px;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      appearance: none;
      -webkit-appearance: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--brand-1);
      box-shadow: 0 0 0 3px rgba(78, 110, 242, 0.1);
      background: #ffffff;
    }

    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }

    .form-group select {
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7c93' d='M1.4 0 6 4.6 10.6 0 12 1.4 6 7.4 0 1.4z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 14px center;
      padding-right: 36px;
    }

    .form-card .btn {
      width: 100%;
      padding: 13px;
      font-size: 15px;
      margin-top: 6px;
    }

    /* ===== 友情链接 ===== */
    .friend-links {
      padding: 32px 0;
      border-top: 1px solid var(--card-border);
      background: #ffffff;
    }

    .friend-links-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px 20px;
    }

    .friend-links-inner .fl-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      margin-right: 4px;
    }

    .friend-links-inner a {
      font-size: 13px;
      color: var(--text-body);
      transition: color 0.2s ease;
    }

    .friend-links-inner a:hover {
      color: var(--brand-1);
    }

    /* ===== 页脚 ===== */
    .site-footer {
      background: #1a2332;
      color: #c7d0dc;
      padding: 56px 0 0;
    }

    .footer-main {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
      gap: 40px;
      padding-bottom: 40px;
    }

    .footer-brand {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .footer-brand .fb-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-brand .fb-logo img {
      max-height: 36px;
      width: auto;
    }

    .footer-brand .fb-logo span {
      font-size: 17px;
      font-weight: 700;
      color: #ffffff;
    }

    .footer-brand p {
      font-size: 13px;
      color: #9aa7b8;
      line-height: 1.8;
    }

    .footer-brand .fb-contact {
      display: flex;
      flex-direction: column;
      gap: 6px;
      font-size: 13px;
      color: #9aa7b8;
    }

    .footer-brand .fb-contact a {
      color: #9aa7b8;
      transition: color 0.2s ease;
    }

    .footer-brand .fb-contact a:hover {
      color: #ffffff;
    }

    .footer-col h4 {
      font-size: 14px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col ul li a {
      font-size: 13px;
      color: #9aa7b8;
      transition: color 0.2s ease;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .footer-qr {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-qr h4 {
      font-size: 14px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 4px;
    }

    .footer-qr .qr-box {
      width: 110px;
      height: 110px;
      border-radius: 10px;
      overflow: hidden;
      background: #ffffff;
      padding: 4px;
    }

    .footer-qr .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .footer-qr .qr-label {
      font-size: 12px;
      color: #9aa7b8;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      font-size: 12px;
      color: #7a8899;
    }

    .footer-bottom a {
      color: #9aa7b8;
      transition: color 0.2s ease;
    }

    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* ===== 浮动客服 ===== */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 92px;
      z-index: 90;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: flex-end;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      color: #fff;
      font-size: 20px;
      position: relative;
    }

    .float-btn:hover {
      transform: translateY(-3px) scale(1.04);
      box-shadow: var(--shadow-lg);
    }

    .float-btn.service { background: linear-gradient(135deg, var(--brand-1), #6b5cf6); }
    .float-btn.top { background: linear-gradient(135deg, var(--brand-3), #4bd3ae); opacity: 0; pointer-events: none; transition: opacity 0.3s ease, transform 0.2s ease; }
    .float-btn.top.show { opacity: 1; pointer-events: auto; }

    .float-qr-popup {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      padding: 10px;
      box-shadow: var(--shadow-lg);
      display: none;
      width: 140px;
    }

    .float-qr-popup.show {
      display: block;
    }

    .float-qr-popup img {
      width: 100%;
      height: auto;
      border-radius: 6px;
    }

    .float-qr-popup span {
      display: block;
      text-align: center;
      font-size: 12px;
      color: var(--text-dark);
      margin-top: 6px;
      font-weight: 600;
    }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
      .hero-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 40px;
      }
      .hero-visual {
        flex: none;
        width: 100%;
        max-width: 480px;
        flex-direction: row;
        flex-wrap: wrap;
      }
      .hero-float-card {
        flex: 1 1 200px;
      }
      .hero-float-card:nth-child(2),
      .hero-float-card:nth-child(3) {
        margin-left: 0;
      }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; gap: 32px; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .token-grid { grid-template-columns: repeat(2, 1fr); }
      .articles-grid { grid-template-columns: repeat(2, 1fr); }
      .form-layout { grid-template-columns: 1fr; gap: 32px; }
      .footer-main { grid-template-columns: 1fr 1fr; gap: 32px; }
      .nav-links { display: none; }
      .menu-toggle { display: flex; }

      .nav-links.is-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--card-border);
        box-shadow: var(--shadow-md);
        padding: 12px var(--container-pad);
        gap: 4px;
        z-index: 99;
      }

      .nav-links.is-open li a {
        padding: 12px 16px;
        border-radius: 8px;
        font-size: 15px;
      }

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

    @media (max-width: 768px) {
      .section { padding: 56px 0; }
      .hero { padding: 64px 0 72px; }
      .hero-stats { gap: 24px; }
      .hero-stat-item strong { font-size: 22px; }
      .metrics-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
      .metric-card { padding: 22px 18px; }
      .metric-card .metric-num { font-size: 26px; }
      .services-grid { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .token-grid { grid-template-columns: 1fr; }
      .articles-grid { grid-template-columns: 1fr; }
      .footer-main { grid-template-columns: 1fr; gap: 28px; }
      .compare-score-card { flex-direction: column; align-items: flex-start; gap: 16px; padding: 24px; }
      .score-divider { display: none; }
      .form-card { padding: 24px; }
      .float-service { right: 16px; bottom: 80px; }
      .float-btn { width: 46px; height: 46px; font-size: 18px; }
      .hero-actions .btn { width: 100%; justify-content: center; }
      .hero-visual { flex-direction: column; }
      .hero-float-card:nth-child(2),
      .hero-float-card:nth-child(3) { margin-left: 0; }
      .about-capabilities { grid-template-columns: 1fr; }
      .about-visual .visual-row { grid-template-columns: 1fr; }
      .friend-links-inner { justify-content: center; }
      .footer-bottom { justify-content: center; text-align: center; }
    }

    @media (max-width: 480px) {
      :root { --container-pad: 16px; }
      .hero h1 { font-size: 26px; }
      .hero-badge { font-size: 12px; }
      .nav-brand .brand-name { font-size: 16px; }
      .hero-stats { flex-direction: column; gap: 16px; }
      .hero-stat-item { flex-direction: row; align-items: baseline; gap: 8px; }
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
      .reveal { opacity: 1; transform: none; }
      html { scroll-behavior: auto; }
    }