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

    :root {
      --bg: #f5f7fc;
      --surface: #ffffff;
      --text: #141925;
      --text-secondary: #3e4a5e;
      --primary: #4b2bdb;
      --primary-light: #7f63f0;
      --accent: #e9437a;
      --accent-soft: #fce8f0;
      --laser-a: #d8c6ff;
      --laser-b: #b8f0ff;
      --laser-c: #ffe3b0;
      --laser-d: #ffd0e8;
      --border: #e4e9f2;
      --shadow-sm: 0 8px 24px rgba(19, 30, 76, 0.06);
      --shadow-md: 0 16px 40px rgba(19, 30, 76, 0.10);
      --radius-md: 18px;
      --radius-lg: 28px;
      --radius-sm: 12px;
      --container: 1200px;
      --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--text);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding: 0 16px 0;
    }

    /* 幻彩背景光晕 */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      pointer-events: none;
      background:
        radial-gradient(circle at 10% 15%, rgba(127, 99, 240, 0.10) 0%, transparent 35%),
        radial-gradient(circle at 92% 20%, rgba(233, 67, 122, 0.08) 0%, transparent 30%),
        radial-gradient(circle at 30% 90%, rgba(184, 240, 255, 0.25) 0%, transparent 35%),
        radial-gradient(circle at 80% 65%, rgba(255, 227, 176, 0.20) 0%, transparent 40%);
      z-index: 0;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    /* ========== 顶部导航 ========== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(245, 247, 252, 0.82);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(228, 233, 242, 0.7);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 72px;
      padding: 8px 0;
    }

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

    .brand .ai-page-logo {
      width: 36px;
      height: 36px;
      object-fit: contain;
      border-radius: 8px;
    }

    .brand-text {
      font-size: 1.15rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--text);
      white-space: nowrap;
    }

    .brand-text span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 12px;
      border-radius: 10px;
      transition: color 0.2s, background 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(75, 43, 219, 0.06);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary);
      color: #fff !important;
      padding: 10px 20px !important;
      border-radius: 40px !important;
      font-weight: 600 !important;
      font-size: 0.88rem !important;
      margin-left: 10px;
      box-shadow: 0 6px 18px rgba(75, 43, 219, 0.28);
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      border: none;
      cursor: pointer;
    }

    .nav-cta:hover {
      background: #3d20b8 !important;
      color: #fff !important;
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(75, 43, 219, 0.36);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      width: 40px;
      height: 40px;
      border-radius: 10px;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
      background: rgba(75, 43, 219, 0.06);
    }

    .mobile-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      background: var(--text);
      border-radius: 4px;
      transition: 0.25s;
    }

    /* ========== 首屏 Hero 无图片 ========== */
    .hero {
      padding: 80px 0 64px;
      position: relative;
      overflow: hidden;
    }

    .hero::after {
      content: '';
      position: absolute;
      right: -10%;
      top: 5%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(127, 99, 240, 0.16) 0%, transparent 65%);
      border-radius: 50%;
      pointer-events: none;
      z-index: -1;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(75, 43, 219, 0.08);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 600;
      padding: 6px 16px 6px 10px;
      border-radius: 40px;
      margin-bottom: 20px;
      letter-spacing: 0.3px;
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.9); }
    }

    .hero h1 {
      font-size: 2.85rem;
      line-height: 1.22;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text);
      margin-bottom: 20px;
    }

    .hero h1 .highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero h1 .highlight::after {
      content: '';
      position: absolute;
      left: 0;
      right: 0;
      bottom: 4px;
      height: 8px;
      background: linear-gradient(90deg, rgba(127, 99, 240, 0.3), rgba(233, 67, 122, 0.2));
      border-radius: 4px;
      z-index: -1;
    }

    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-secondary);
      max-width: 520px;
      margin-bottom: 28px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 32px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(120deg, var(--primary) 0%, #6a4cf0 100%);
      color: #fff;
      font-weight: 600;
      font-size: 1rem;
      padding: 14px 32px;
      border-radius: 60px;
      border: none;
      cursor: pointer;
      box-shadow: 0 10px 28px rgba(75, 43, 219, 0.30);
      transition: transform 0.25s, box-shadow 0.25s;
      text-decoration: none;
      line-height: 1.4;
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 34px rgba(75, 43, 219, 0.40);
    }

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

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: #fff;
      color: var(--text);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 13px 28px;
      border-radius: 60px;
      border: 1.5px solid var(--border);
      cursor: pointer;
      transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
      text-decoration: none;
      line-height: 1.4;
    }

    .btn-secondary:hover {
      border-color: var(--primary-light);
      box-shadow: 0 8px 20px rgba(75, 43, 219, 0.10);
      transform: translateY(-2px);
    }

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 36px;
      padding-top: 8px;
    }

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

    .hero-stat-item strong {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    .hero-stat-item span {
      font-size: 0.85rem;
      color: var(--text-secondary);
      margin-top: 2px;
    }

    /* 首屏右侧装饰卡片（无图片） */
    .hero-visual {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .hero-orb-card {
      background: rgba(255, 255, 255, 0.66);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(255, 255, 255, 0.8);
      border-radius: 32px;
      padding: 32px 28px;
      width: 100%;
      max-width: 360px;
      box-shadow: 0 24px 60px rgba(75, 43, 219, 0.12);
      position: relative;
      animation: floatCard 6s ease-in-out infinite;
    }

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

    .orb-card-label {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 14px;
    }

    .orb-card-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px dashed rgba(75, 43, 219, 0.12);
      font-size: 0.95rem;
    }

    .orb-card-row:last-child {
      border-bottom: none;
    }

    .orb-card-row .model-name {
      color: var(--text);
      font-weight: 500;
    }

    .orb-card-row .model-price {
      color: var(--primary);
      font-weight: 700;
      font-size: 0.9rem;
    }

    .orb-card-footer {
      margin-top: 18px;
      display: flex;
      align-items: center;
      gap: 10px;
      background: rgba(75, 43, 219, 0.05);
      border-radius: 14px;
      padding: 10px 14px;
      font-size: 0.82rem;
      color: var(--text-secondary);
    }

    .orb-card-footer .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #2bbd7e;
      flex-shrink: 0;
    }

    /* ========== 通用 Section ========== */
    section {
      padding: 56px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 42px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 1.5px;
      color: var(--primary);
      background: rgba(75, 43, 219, 0.07);
      padding: 5px 16px;
      border-radius: 40px;
      margin-bottom: 14px;
      text-transform: uppercase;
    }

    .section-header h2 {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1.3;
      letter-spacing: -0.3px;
      color: var(--text);
    }

    .section-header p {
      margin-top: 12px;
      font-size: 1rem;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    /* ========== 数据指标卡片 ========== */
    .metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .metric-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 26px 22px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--accent), var(--laser-b));
    }

    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .metric-card .metric-num {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    .metric-card .metric-label {
      font-size: 0.88rem;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    /* ========== 服务能力卡片 ========== */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

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

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(75, 43, 219, 0.2);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 16px;
      background: linear-gradient(135deg, rgba(127, 99, 240, 0.12), rgba(233, 67, 122, 0.08));
      color: var(--primary);
    }

    .service-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.65;
      flex: 1;
    }

    /* ========== 平台介绍 ========== */
    .platform-intro {
      background: rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.8);
      border-radius: var(--radius-lg);
      padding: 44px 40px;
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }

    .platform-intro h2 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .platform-intro p {
      color: var(--text-secondary);
      font-size: 0.96rem;
      line-height: 1.75;
      margin-bottom: 14px;
    }

    .platform-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .platform-tags span {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 40px;
      padding: 6px 16px;
      font-size: 0.82rem;
      font-weight: 500;
      color: var(--text-secondary);
      transition: border-color 0.2s, color 0.2s;
    }

    .platform-tags span:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .platform-intro-stats {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .pi-stat {
      background: #fff;
      border-radius: var(--radius-sm);
      padding: 20px;
      border: 1px solid var(--border);
      text-align: center;
    }

    .pi-stat strong {
      display: block;
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
    }

    .pi-stat span {
      font-size: 0.82rem;
      color: var(--text-secondary);
    }

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

    .step-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px 22px 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .step-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .step-card::before {
      counter-increment: step;
      content: '0' counter(step);
      font-size: 2.2rem;
      font-weight: 800;
      color: rgba(75, 43, 219, 0.10);
      line-height: 1;
      position: absolute;
      top: 18px;
      right: 18px;
    }

    .step-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* ========== 对比表格 ========== */
    .compare-wrap {
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.92rem;
      min-width: 720px;
    }

    .compare-table th {
      background: #f2effd;
      color: var(--text);
      font-weight: 700;
      padding: 16px 18px;
      text-align: left;
      border-bottom: 2px solid var(--border);
      white-space: nowrap;
    }

    .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border);
      color: var(--text-secondary);
      vertical-align: top;
    }

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

    .compare-table tr:hover td {
      background: #faf9ff;
    }

    .compare-table .star {
      color: #f5a623;
      font-size: 1rem;
      letter-spacing: 1px;
    }

    .compare-score {
      font-weight: 800;
      color: var(--primary);
      font-size: 1.05rem;
    }

    .compare-badge {
      display: inline-block;
      background: rgba(75, 43, 219, 0.08);
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 10px;
      border-radius: 40px;
      margin-left: 8px;
    }

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

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

    .faq-item.active {
      border-color: rgba(75, 43, 219, 0.3);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 22px;
      font-size: 0.98rem;
      font-weight: 600;
      color: var(--text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      cursor: pointer;
      text-align: left;
      font-family: var(--font);
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #faf9ff;
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: rgba(75, 43, 219, 0.07);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      transition: transform 0.3s, background 0.2s;
      font-size: 1rem;
      color: var(--primary);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: var(--primary);
      color: #fff;
    }

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

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

    .faq-answer p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    /* ========== 客户评论 ========== */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .review-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex;
      flex-direction: column;
    }

    .review-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }

    .review-stars {
      color: #f5a623;
      font-size: 0.95rem;
      letter-spacing: 2px;
      margin-bottom: 12px;
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.7;
      flex: 1;
      margin-bottom: 16px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--laser-a), var(--laser-d));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text);
      flex-shrink: 0;
    }

    .review-author-info strong {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text);
    }

    .review-author-info span {
      font-size: 0.78rem;
      color: var(--text-secondary);
    }

    /* ========== 案例展示 ========== */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .case-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .case-media {
      aspect-ratio: 16 / 10;
      overflow: hidden;
      background: #f0eefb;
    }

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

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

    .case-body {
      padding: 18px 20px 22px;
    }

    .case-body h3 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-body p {
      font-size: 0.85rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* ========== 文章列表 ========== */
    .articles-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      background: var(--surface);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      padding: 20px 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
      text-decoration: none;
    }

    .article-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: rgba(75, 43, 219, 0.2);
    }

    .article-item span {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text);
    }

    .article-item .arrow {
      color: var(--primary);
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    /* ========== 表单 ========== */
    .form-section {
      background: var(--surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
      padding: 44px 40px;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      max-width: 760px;
      margin: 0 auto;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 12px;
      border: 1.5px solid var(--border);
      font-size: 0.92rem;
      font-family: var(--font);
      color: var(--text);
      background: #fafbff;
      transition: border-color 0.2s, box-shadow 0.2s;
      outline: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 4px rgba(75, 43, 219, 0.08);
    }

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

    .form-submit {
      grid-column: 1 / -1;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(120deg, var(--primary), #6a4cf0);
      color: #fff;
      border: none;
      border-radius: 60px;
      padding: 15px 44px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 10px 24px rgba(75, 43, 219, 0.28);
      transition: transform 0.2s, box-shadow 0.2s;
      font-family: var(--font);
      margin-top: 6px;
    }

    .form-submit:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px rgba(75, 43, 219, 0.36);
    }

    .form-submit:active {
      transform: translateY(0);
    }

    /* ========== 联系方式卡片 ========== */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      margin-top: 36px;
    }

    .contact-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      display: flex;
      gap: 18px;
      align-items: flex-start;
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .contact-icon {
      width: 44px;
      height: 44px;
      border-radius: 14px;
      background: rgba(75, 43, 219, 0.07);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: var(--primary);
      flex-shrink: 0;
    }

    .contact-card h3 {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .contact-card p {
      font-size: 0.88rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .contact-card .kefu-qr {
      width: 100px;
      height: auto;
      border-radius: 8px;
      border: 1px solid var(--border);
      margin-top: 8px;
    }

    /* ========== 友情链接 ========== */
    .links-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 14px;
      justify-content: center;
      margin-top: 10px;
    }

    .links-cloud a {
      font-size: 0.85rem;
      color: var(--text-secondary);
      background: #fff;
      border: 1px solid var(--border);
      padding: 6px 16px;
      border-radius: 40px;
      transition: border-color 0.2s, color 0.2s, background 0.2s;
      text-decoration: none;
    }

    .links-cloud a:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(75, 43, 219, 0.03);
    }

    /* ========== 页脚 ========== */
    .site-footer {
      background: #0e1430;
      color: #cdd4e8;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
      margin-top: 20px;
      padding: 44px 0 0;
    }

    .footer-inner {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 16px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 36px;
      padding-bottom: 36px;
    }

    .footer-brand .brand-text {
      color: #fff;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.85rem;
      line-height: 1.7;
      color: #9aa4c4;
      max-width: 280px;
      margin-bottom: 16px;
    }

    .footer-col h4 {
      font-size: 0.9rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

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

    .footer-col ul li a {
      font-size: 0.85rem;
      color: #9aa4c4;
      transition: color 0.2s;
    }

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

    .footer-social {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 6px;
    }

    .footer-social span {
      font-size: 0.78rem;
      background: rgba(255, 255, 255, 0.07);
      border-radius: 40px;
      padding: 4px 12px;
      color: #cdd4e8;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      font-size: 0.8rem;
      color: #7e89a8;
    }

    .footer-bottom a {
      color: #b5bfd9;
      text-decoration: none;
    }

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

    /* ========== 浮动客服 ========== */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-end;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      box-shadow: 0 8px 24px rgba(75, 43, 219, 0.35);
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      text-decoration: none;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
      box-shadow: 0 12px 30px rgba(75, 43, 219, 0.45);
      background: #3d20b8;
    }

    .float-btn .tooltip {
      position: absolute;
      right: 62px;
      top: 50%;
      transform: translateY(-50%);
      background: #141925;
      color: #fff;
      font-size: 0.78rem;
      padding: 6px 14px;
      border-radius: 8px;
      white-space: nowrap;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.2s;
    }

    .float-btn:hover .tooltip {
      opacity: 1;
    }

    .float-top {
      background: #fff;
      color: var(--primary);
      border: 1px solid var(--border);
      box-shadow: 0 6px 18px rgba(19, 30, 76, 0.10);
      display: none;
    }

    .float-top.visible {
      display: flex;
    }

    /* ========== 响应式 ========== */
    @media (max-width: 1024px) {
      .hero h1 { font-size: 2.4rem; }
      .hero-grid { grid-template-columns: 1fr; gap: 36px; }
      .hero-visual { justify-content: flex-start; }
      .hero-orb-card { max-width: 420px; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-row { grid-template-columns: repeat(2, 1fr); }
      .platform-intro { grid-template-columns: 1fr; padding: 32px 28px; }
      .steps-row { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      body { padding: 0 12px; }
      .header-inner { min-height: 62px; flex-wrap: wrap; }
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px 0 16px;
      }
      .nav-links.open { display: flex; }
      .nav-links a {
        padding: 12px 16px;
        border-radius: 10px;
        font-size: 0.92rem;
        width: 100%;
        display: block;
      }
      .nav-cta {
        margin-left: 0 !important;
        margin-top: 6px;
        width: 100%;
        justify-content: center;
      }
      .mobile-toggle { display: flex; }
      .hero { padding: 48px 0 40px; }
      .hero h1 { font-size: 1.95rem; }
      .hero-desc { font-size: 0.95rem; }
      .hero-actions { gap: 10px; }
      .btn-primary, .btn-secondary { padding: 12px 24px; font-size: 0.92rem; }
      .hero-stats { gap: 24px; }
      .hero-stat-item strong { font-size: 1.5rem; }
      .section-header h2 { font-size: 1.6rem; }
      section { padding: 40px 0; }
      .services-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .metrics-row { grid-template-columns: 1fr 1fr; }
      .steps-row { grid-template-columns: 1fr; }
      .articles-list { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-section { padding: 28px 20px; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .float-kefu { right: 12px; bottom: 16px; }
      .float-btn { width: 46px; height: 46px; font-size: 1.15rem; }
      .platform-intro-stats { grid-template-columns: 1fr 1fr; }
      .hero-orb-card { max-width: 100%; padding: 24px 20px; }
    }

    @media (max-width: 480px) {
      .hero h1 { font-size: 1.6rem; }
      .hero-stats { gap: 16px; }
      .hero-stat-item strong { font-size: 1.3rem; }
      .metric-card .metric-num { font-size: 1.6rem; }
      .platform-intro { padding: 24px 18px; }
      .platform-intro h2 { font-size: 1.4rem; }
      .section-header h2 { font-size: 1.35rem; }
      .form-grid { gap: 14px; }
      .compare-table th, .compare-table td { padding: 12px 14px; font-size: 0.84rem; }
      .footer-inner { padding: 0 12px; }
      .brand-text { font-size: 1rem; }
      .brand .ai-page-logo { width: 30px; height: 30px; }
    }

    /* 滚动渐入 */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    /* 减少动画偏好 */
    @media (prefers-reduced-motion: reduce) {
      .reveal { opacity: 1; transform: none; transition: none; }
      .hero-orb-card { animation: none; }
      .hero-badge .dot { animation: none; }
    }