/* ---------- 全局重置与变量 ---------- */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --bg-base: #f5f7ff;
      --bg-soft: #eef1fe;
      --bg-white: #ffffff;
      --text-dark: #1a1d2b;
      --text-body: #3d4152;
      --text-muted: #6b7080;
      --primary: #3a3af4;
      --primary-soft: #e8e9fe;
      --accent: #00c2a8;
      --accent-soft: #d9faf4;
      --pink: #f05cc0;
      --pink-soft: #fde8f5;
      --border: #dfe3f0;
      --shadow-sm: 0 4px 16px rgba(58, 58, 244, 0.06);
      --shadow-md: 0 12px 40px rgba(58, 58, 244, 0.10);
      --shadow-lg: 0 20px 60px rgba(58, 58, 244, 0.13);
      --radius-sm: 10px;
      --radius-md: 18px;
      --radius-lg: 28px;
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --container: 1200px;
      --gap: 24px;
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font);
      color: var(--text-body);
      background: var(--bg-base);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a { text-decoration: none; color: inherit; }
    ul, ol { list-style: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    .section {
      padding: 72px 0;
      position: relative;
    }
    .section--tight { padding: 48px 0; }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }
    .section-header h2 {
      font-size: clamp(1.6rem, 3.2vw, 2.2rem);
      color: var(--text-dark);
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-header p {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .eyebrow {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 600;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--primary);
      background: var(--primary-soft);
      padding: 5px 16px;
      border-radius: 100px;
      margin-bottom: 16px;
    }
    /* ---------- 动态渐变背景氛围 ---------- */
    .glow-bg {
      position: fixed;
      inset: 0;
      z-index: -1;
      background:
        radial-gradient(ellipse 60% 50% at 15% 10%, rgba(58, 58, 244, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 85% 20%, rgba(240, 92, 192, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse 60% 50% at 50% 80%, rgba(0, 194, 168, 0.06) 0%, transparent 60%),
        var(--bg-base);
      pointer-events: none;
    }
    /* ---------- 顶部导航 ---------- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(223, 227, 240, 0.7);
      transition: box-shadow 0.3s ease;
    }
    .site-header.scrolled { box-shadow: var(--shadow-sm); }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 68px;
      gap: 16px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .brand .ai-page-logo {
      max-height: 38px;
      width: auto;
    }
    .brand-text {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.01em;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .nav-links a {
      display: inline-block;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 11px;
      border-radius: 8px;
      transition: color 0.2s ease, background 0.2s ease;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: var(--primary-soft);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 7px;
      font-family: var(--font);
      font-size: 0.9rem;
      font-weight: 600;
      padding: 11px 24px;
      border-radius: 100px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
      white-space: nowrap;
      line-height: 1.2;
    }
    .btn:active { transform: scale(0.96); }
    .btn-primary {
      background: linear-gradient(135deg, #3a3af4, #6d5ef8);
      color: #fff;
      box-shadow: 0 6px 22px rgba(58, 58, 244, 0.32);
    }
    .btn-primary:hover {
      box-shadow: 0 10px 30px rgba(58, 58, 244, 0.42);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: #fff;
      color: var(--text-dark);
      border-color: var(--border);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .btn-accent {
      background: linear-gradient(135deg, #00c2a8, #00d9b8);
      color: #fff;
      box-shadow: 0 6px 22px rgba(0, 194, 168, 0.3);
    }
    .btn-accent:hover {
      box-shadow: 0 10px 30px rgba(0, 194, 168, 0.42);
      transform: translateY(-2px);
    }
    .btn-lg { padding: 14px 32px; font-size: 1rem; }
    .btn-sm { padding: 8px 18px; font-size: 0.82rem; }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      flex-direction: column;
      gap: 5px;
      flex-shrink: 0;
    }
    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2.5px;
      border-radius: 2px;
      background: var(--text-dark);
      transition: transform 0.28s ease, opacity 0.2s ease;
    }
    .nav-toggle.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
    /* ---------- HERO 首屏（无图片） ---------- */
    .hero {
      position: relative;
      padding: 80px 0 64px;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -180px;
      right: -160px;
      width: 560px;
      height: 560px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(58, 58, 244, 0.12), transparent 70%);
      pointer-events: none;
    }
    .hero::after {
      content: "";
      position: absolute;
      bottom: -140px;
      left: -140px;
      width: 460px;
      height: 460px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(240, 92, 192, 0.10), transparent 70%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
      position: relative;
      z-index: 1;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-soft);
      padding: 6px 16px;
      border-radius: 100px;
      margin-bottom: 22px;
      letter-spacing: 0.02em;
    }
    .hero-badge::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--primary);
      animation: pulse-dot 2s ease-in-out infinite;
    }
    @keyframes pulse-dot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.8); }
    }
    .hero h1 {
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.22;
      letter-spacing: -0.03em;
      margin-bottom: 22px;
    }
    .hero h1 .highlight {
      background: linear-gradient(120deg, #3a3af4 0%, #f05cc0 60%, #00c2a8 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-body);
      line-height: 1.85;
      margin-bottom: 34px;
      max-width: 560px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }
    /* 首屏右侧几何装饰 + 指标 */
    .hero-visual {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .hero-shape {
      position: absolute;
      inset: 0;
      pointer-events: none;
      z-index: 0;
    }
    .shape-ring {
      position: absolute;
      top: 6%;
      right: 4%;
      width: 200px;
      height: 200px;
      border-radius: 50%;
      border: 2px solid rgba(58, 58, 244, 0.14);
      animation: float-slow 9s ease-in-out infinite;
    }
    .shape-ring--2 {
      top: 32%;
      right: 26%;
      width: 120px;
      height: 120px;
      border-color: rgba(240, 92, 192, 0.18);
      animation-delay: -3s;
    }
    .shape-dot-grid {
      position: absolute;
      bottom: 4%;
      right: 10%;
      width: 140px;
      height: 140px;
      background-image: radial-gradient(circle, rgba(58, 58, 244, 0.18) 1.5px, transparent 1.5px);
      background-size: 18px 18px;
      animation: float-slow 12s ease-in-out infinite reverse;
    }
    @keyframes float-slow {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      50% { transform: translateY(-16px) rotate(6deg); }
    }
    .metric-card {
      position: relative;
      z-index: 1;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(223, 227, 240, 0.9);
      border-radius: var(--radius-md);
      padding: 20px 22px;
      display: flex;
      align-items: center;
      gap: 16px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      flex-shrink: 0;
    }
    .metric-icon--blue { background: var(--primary-soft); color: var(--primary); }
    .metric-icon--pink { background: var(--pink-soft); color: var(--pink); }
    .metric-icon--green { background: var(--accent-soft); color: var(--accent); }
    .metric-info { min-width: 0; }
    .metric-info strong {
      display: block;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.15;
      letter-spacing: -0.02em;
    }
    .metric-info span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    /* ---------- 平台介绍 ---------- */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .intro-text h2 {
      font-size: clamp(1.7rem, 3vw, 2.2rem);
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }
    .intro-text p {
      color: var(--text-body);
      line-height: 1.85;
      margin-bottom: 16px;
      font-size: 0.98rem;
    }
    .intro-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }
    .tag {
      font-size: 0.82rem;
      font-weight: 500;
      padding: 7px 16px;
      border-radius: 100px;
      background: #fff;
      border: 1px solid var(--border);
      color: var(--text-body);
      transition: all 0.25s ease;
    }
    .tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .intro-highlight {
      background: linear-gradient(135deg, rgba(58, 58, 244, 0.04), rgba(240, 92, 192, 0.04));
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
    }
    .intro-highlight h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .intro-highlight h3::before {
      content: "";
      width: 4px;
      height: 20px;
      border-radius: 2px;
      background: linear-gradient(180deg, #3a3af4, #f05cc0);
    }
    .highlight-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .highlight-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.6;
    }
    .highlight-list li::before {
      content: "✓";
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 0.72rem;
      font-weight: 700;
      flex-shrink: 0;
      margin-top: 2px;
    }
    /* ---------- 服务能力卡片 ---------- */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .feature-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .feature-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #3a3af4, #f05cc0, #00c2a8);
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(58, 58, 244, 0.2);
    }
    .feature-card:hover::after { opacity: 1; }
    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 1.08rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .feature-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.75;
    }
    /* ---------- 流程步骤 ---------- */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: step;
    }
    .step-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      position: relative;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .step-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 50%;
      font-size: 0.95rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #fff;
    }
    .step-item:nth-child(1) .step-num { background: linear-gradient(135deg, #3a3af4, #6d5ef8); }
    .step-item:nth-child(2) .step-num { background: linear-gradient(135deg, #f05cc0, #ff7ed6); }
    .step-item:nth-child(3) .step-num { background: linear-gradient(135deg, #00c2a8, #00d9b8); }
    .step-item:nth-child(4) .step-num { background: linear-gradient(135deg, #f5a623, #ffc04d); }
    .step-item h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* ---------- 对比评测 ---------- */
    .compare-wrap {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-scroll { overflow-x: auto; }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 680px;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      text-align: left;
      font-size: 0.9rem;
      border-bottom: 1px solid var(--border);
      vertical-align: top;
    }
    .compare-table th {
      background: var(--bg-soft);
      color: var(--text-dark);
      font-weight: 700;
      font-size: 0.88rem;
      white-space: nowrap;
    }
    .compare-table td:first-child {
      font-weight: 600;
      color: var(--text-dark);
      white-space: nowrap;
    }
    .compare-table tr:last-child td { border-bottom: none; }
    .compare-table .highlight-row td {
      background: linear-gradient(90deg, rgba(58, 58, 244, 0.05), rgba(240, 92, 192, 0.04));
    }
    .score-badge {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, #3a3af4, #f05cc0);
      color: #fff;
      margin: 0 auto 24px;
    }
    .score-badge .score-num {
      font-size: 2.4rem;
      font-weight: 800;
      line-height: 1;
      letter-spacing: -0.03em;
    }
    .score-badge .score-label {
      font-size: 0.78rem;
      opacity: 0.9;
      margin-top: 4px;
      letter-spacing: 0.1em;
    }
    .stars {
      color: #f5a623;
      font-size: 1.05rem;
      letter-spacing: 2px;
    }
    /* ---------- 案例展示 ---------- */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: var(--gap);
    }
    .case-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: var(--bg-soft);
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img img { transform: scale(1.04); }
    .case-body { padding: 20px 22px; }
    .case-body h3 {
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .case-body p {
      font-size: 0.87rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* ---------- 用户评论 ---------- */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .review-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .review-stars {
      color: #f5a623;
      font-size: 0.92rem;
      letter-spacing: 2px;
    }
    .review-text {
      font-size: 0.92rem;
      color: var(--text-body);
      line-height: 1.8;
      flex: 1;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 4px;
      border-top: 1px solid var(--border);
    }
    .review-avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      font-weight: 700;
      color: #fff;
      flex-shrink: 0;
    }
    .review-meta strong {
      display: block;
      font-size: 0.88rem;
      color: var(--text-dark);
      font-weight: 600;
    }
    .review-meta span {
      font-size: 0.78rem;
      color: var(--text-muted);
    }
    /* ---------- FAQ ---------- */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .faq-item.open {
      border-color: rgba(58, 58, 244, 0.25);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      font-family: var(--font);
      font-size: 0.98rem;
      font-weight: 600;
      color: var(--text-dark);
      text-align: left;
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      transition: color 0.2s ease;
      line-height: 1.5;
    }
    .faq-question:hover { color: var(--primary); }
    .faq-question .faq-icon {
      flex-shrink: 0;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      font-weight: 700;
      transition: transform 0.3s ease, background 0.3s ease;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      background: var(--primary);
      color: #fff;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-answer-inner {
      padding: 0 22px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.85;
    }
    /* ---------- 表单 ---------- */
    .form-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .form-group { display: flex; flex-direction: column; gap: 7px; }
    .form-group.full { grid-column: 1 / -1; }
    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-dark);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      font-family: var(--font);
      font-size: 0.92rem;
      color: var(--text-dark);
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg-base);
      transition: border-color 0.22s ease, box-shadow 0.22s ease;
      width: 100%;
      outline: none;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(58, 58, 244, 0.12);
      background: #fff;
    }
    .form-group textarea { resize: vertical; min-height: 110px; }
    .form-submit {
      margin-top: 24px;
      display: flex;
      justify-content: flex-start;
    }
    /* ---------- 文章列表 ---------- */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .article-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    }
    .article-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(58, 58, 244, 0.2);
    }
    .article-card .article-tag {
      font-size: 0.72rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-soft);
      padding: 3px 12px;
      border-radius: 100px;
      align-self: flex-start;
    }
    .article-card h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.45;
    }
    .article-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.7;
      flex: 1;
    }
    .article-card .article-link {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 5px;
      transition: gap 0.2s ease;
    }
    .article-card .article-link::after { content: "→"; transition: transform 0.2s ease; }
    .article-card:hover .article-link { gap: 9px; }
    /* ---------- 友情链接 ---------- */
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .friend-links a {
      font-size: 0.84rem;
      color: var(--text-muted);
      background: #fff;
      border: 1px solid var(--border);
      padding: 7px 18px;
      border-radius: 100px;
      transition: all 0.25s ease;
    }
    .friend-links a:hover {
      color: var(--primary);
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    /* ---------- 页脚 ---------- */
    .site-footer {
      background: #141726;
      color: #b8bdd0;
      padding: 52px 0 24px;
      margin-top: 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 36px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    }
    .footer-brand .brand-text { color: #fff; }
    .footer-brand .brand { margin-bottom: 16px; }
    .footer-desc {
      font-size: 0.88rem;
      line-height: 1.8;
      color: #9ba1b8;
      margin-bottom: 20px;
      max-width: 360px;
    }
    .footer-contact {
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 0.85rem;
      color: #9ba1b8;
    }
    .footer-contact a { color: #9ba1b8; transition: color 0.2s ease; }
    .footer-contact a:hover { color: #fff; }
    .footer-col h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 18px;
    }
    .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
    .footer-col ul a {
      font-size: 0.85rem;
      color: #9ba1b8;
      transition: color 0.2s ease;
    }
    .footer-col ul a:hover { color: #fff; }
    .footer-bottom {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding-top: 24px;
      font-size: 0.8rem;
      color: #7a8099;
    }
    .footer-bottom a { color: #9ba1b8; }
    .footer-bottom a:hover { color: #fff; }
    .footer-qr {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }
    .footer-qr img {
      width: 72px;
      height: 72px;
      border-radius: 8px;
      object-fit: cover;
      background: #fff;
      padding: 4px;
    }
    /* ---------- 浮动客服与返回顶部 ---------- */
    .float-actions {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      font-size: 1.1rem;
      background: #fff;
      color: var(--text-dark);
      position: relative;
    }
    .float-btn:hover { transform: translateY(-3px) scale(1.04); }
    .float-btn--primary {
      background: linear-gradient(135deg, #3a3af4, #6d5ef8);
      color: #fff;
    }
    .float-btn--accent {
      background: linear-gradient(135deg, #00c2a8, #00d9b8);
      color: #fff;
    }
    .float-tooltip {
      position: absolute;
      right: 58px;
      top: 50%;
      transform: translateY(-50%) translateX(6px);
      background: var(--text-dark);
      color: #fff;
      font-size: 0.75rem;
      padding: 6px 12px;
      border-radius: 6px;
      white-space: nowrap;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.22s ease, transform 0.22s ease;
    }
    .float-btn:hover .float-tooltip {
      opacity: 1;
      transform: translateY(-50%) translateX(0);
    }
    /* ---------- 滚动渐入 ---------- */
    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* ---------- 响应式 ---------- */
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .nav-toggle { display: flex; }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        padding: 16px 24px 24px;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--border);
        gap: 4px;
        align-items: stretch;
      }
      .nav-links.mobile-open a { padding: 12px 14px; font-size: 0.95rem; border-radius: 8px; }
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .hero-visual { max-width: 520px; }
      .intro-grid { grid-template-columns: 1fr; gap: 32px; }
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .section { padding: 52px 0; }
      .container { padding: 0 18px; }
      .hero { padding: 52px 0 44px; }
      .hero h1 { font-size: 1.9rem; }
      .hero-desc { font-size: 0.95rem; }
      .card-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-card { padding: 26px 20px; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; text-align: center; align-items: flex-start; }
      .compare-table th, .compare-table td { padding: 12px 14px; font-size: 0.84rem; }
      .metric-card { padding: 16px 18px; }
      .metric-info strong { font-size: 1.3rem; }
      .float-actions { right: 14px; bottom: 18px; }
      .float-btn { width: 44px; height: 44px; font-size: 1rem; }
    }
    @media (max-width: 480px) {
      .hero-actions { flex-direction: column; align-items: stretch; }
      .hero-actions .btn { width: 100%; }
      .section-header h2 { font-size: 1.45rem; }
    }