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

    :root {
      --bg: #f5f7fc;
      --bg-gradient: linear-gradient(145deg, #f9faff 0%, #eef0f8 100%);
      --primary: #2a5cff;
      --primary-dark: #1a3fb0;
      --primary-light: #e5ebff;
      --accent: #7c3aed;
      --accent-light: #f0e6ff;
      --iris1: #5b8def;
      --iris2: #a26bf0;
      --iris3: #44c6e0;
      --text-dark: #111827;
      --text-main: #1e2a44;
      --text-muted: #4b556b;
      --text-light: #6b7a99;
      --white: #ffffff;
      --card-bg: rgba(255, 255, 255, 0.75);
      --card-border: rgba(255, 255, 255, 0.9);
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.02), 0 8px 24px rgba(20, 40, 100, 0.04);
      --shadow-md: 0 8px 28px rgba(42, 92, 255, 0.08), 0 2px 8px rgba(0, 0, 0, 0.02);
      --shadow-lg: 0 16px 40px rgba(42, 92, 255, 0.12);
      --radius: 20px;
      --radius-sm: 12px;
      --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font);
      background: var(--bg-gradient);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 镭射幻彩光效背景 */
    .glow-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 0;
      overflow: hidden;
    }

    .glow-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(100px);
      opacity: 0.35;
      animation: orbFloat 18s ease-in-out infinite alternate;
    }

    .orb-1 {
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, #7c3aed, transparent 70%);
      top: -10%;
      left: -5%;
      animation-delay: 0s;
    }

    .orb-2 {
      width: 550px;
      height: 550px;
      background: radial-gradient(circle, #2a5cff, transparent 70%);
      bottom: 5%;
      right: -8%;
      animation-delay: -6s;
      opacity: 0.28;
    }

    .orb-3 {
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, #44c6e0, transparent 70%);
      top: 40%;
      left: 50%;
      transform: translateX(-50%);
      animation-delay: -12s;
      opacity: 0.2;
    }

    @keyframes orbFloat {
      0% { transform: translate(0, 0) scale(1); }
      100% { transform: translate(40px, -50px) scale(1.15); }
    }

    /* 导航 */
    header {
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(16px);
      background: rgba(255, 255, 255, 0.7);
      border-bottom: 1px solid rgba(255, 255, 255, 0.8);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      gap: 16px;
    }

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

    .ai-page-logo {
      height: 32px;
      width: auto;
      max-width: 100%;
      display: block;
    }

    .brand-text {
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--text-dark);
      letter-spacing: -0.02em;
      white-space: nowrap;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 0.88rem;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      border-radius: 8px;
      transition: color 0.2s, background 0.2s;
      white-space: nowrap;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 10px 20px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: 100px;
      border: none;
      cursor: pointer;
      text-decoration: none;
      transition: all 0.25s ease;
      font-family: var(--font);
      line-height: 1.4;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      color: #fff;
      box-shadow: 0 6px 18px rgba(42, 92, 255, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(42, 92, 255, 0.4);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.6);
      color: var(--text-main);
      border: 1.5px solid rgba(42, 92, 255, 0.25);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      background: var(--white);
      transform: translateY(-1px);
    }

    .btn-sm {
      padding: 8px 16px;
      font-size: 0.82rem;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
      cursor: pointer;
      padding: 4px 8px;
      line-height: 1;
    }

    /* 首屏 Hero - 无图片 */
    .hero {
      position: relative;
      z-index: 1;
      padding: 64px 0 48px;
      text-align: center;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(42, 92, 255, 0.08);
      color: var(--primary);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 100px;
      margin-bottom: 20px;
      letter-spacing: 0.04em;
      border: 1px solid rgba(42, 92, 255, 0.12);
    }

    .hero h1 {
      font-size: clamp(2rem, 5vw, 3.4rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-dark);
      letter-spacing: -0.03em;
      margin-bottom: 18px;
      max-width: 880px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero h1 span {
      background: linear-gradient(135deg, #2a5cff 0%, #7c3aed 50%, #44c6e0 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .hero-desc {
      font-size: 1.08rem;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 28px;
      line-height: 1.7;
    }

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

    .hero-actions .btn {
      padding: 14px 32px;
      font-size: 1rem;
    }

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px 40px;
      margin-top: 8px;
    }

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

    .hero-stat-num {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.02em;
    }

    .hero-stat-label {
      font-size: 0.78rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* 通用 Section */
    section {
      position: relative;
      z-index: 1;
      padding: 56px 0;
    }

    .section-label {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: clamp(1.6rem, 3.5vw, 2.2rem);
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.02em;
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-sub {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 32px;
      line-height: 1.7;
    }

    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 26px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    /* 关于我们 & 平台介绍 */
    .about-flex {
      display: flex;
      gap: 32px;
      align-items: flex-start;
    }

    .about-content {
      flex: 1 1 60%;
    }

    .about-side {
      flex: 1 1 35%;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .about-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .about-list li::before {
      content: "◆";
      color: var(--primary);
      font-size: 0.7rem;
      margin-top: 4px;
      flex-shrink: 0;
    }

    .mini-stat {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 16px 18px;
    }

    .mini-stat-icon {
      width: 42px;
      height: 42px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    .mini-stat-text strong {
      display: block;
      font-size: 1.1rem;
      color: var(--text-dark);
    }

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

    /* 服务能力卡片 */
    .service-card {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 4px;
      background: linear-gradient(135deg, rgba(42, 92, 255, 0.12), rgba(124, 58, 237, 0.12));
    }

    .service-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
    }

    .step-item {
      flex: 1 1 160px;
      max-width: 200px;
      text-align: center;
      padding: 20px 14px;
      background: var(--card-bg);
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      color: #fff;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 10px;
    }

    .step-item h4 {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 4px;
    }

    .step-item p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .case-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
    }

    .case-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16/10;
      overflow: hidden;
      background: #eef0f8;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    .case-body {
      padding: 16px 18px 20px;
    }

    .case-body h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 4px;
    }

    .case-body p {
      font-size: 0.84rem;
      color: var(--text-muted);
    }

    /* 对比表格 */
    .table-wrap {
      overflow-x: auto;
      border-radius: var(--radius);
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 640px;
      font-size: 0.9rem;
    }

    th {
      text-align: left;
      padding: 16px 20px;
      background: rgba(42, 92, 255, 0.06);
      color: var(--text-dark);
      font-weight: 700;
      font-size: 0.85rem;
      white-space: nowrap;
    }

    td {
      padding: 14px 20px;
      border-top: 1px solid rgba(0, 0, 0, 0.04);
      color: var(--text-main);
    }

    tr:hover td {
      background: rgba(42, 92, 255, 0.02);
    }

    .rating-stars {
      color: #f5a623;
      letter-spacing: 2px;
      font-size: 1.1rem;
    }

    .score-badge {
      display: inline-block;
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      color: #fff;
      font-weight: 700;
      padding: 2px 12px;
      border-radius: 100px;
      font-size: 0.82rem;
    }

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

    .review-card {
      padding: 22px 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

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

    .review-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 1rem;
      flex-shrink: 0;
    }

    .review-name {
      font-weight: 700;
      font-size: 0.92rem;
      color: var(--text-dark);
    }

    .review-role {
      font-size: 0.78rem;
      color: var(--text-light);
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.3s;
    }

    .faq-item:hover {
      box-shadow: var(--shadow-md);
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      cursor: pointer;
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-dark);
      user-select: none;
      gap: 12px;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.25s;
      flex-shrink: 0;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s ease;
      padding: 0 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 20px 18px;
    }

    /* 资讯 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      padding: 18px 20px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      text-decoration: none;
    }

    .article-item:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .article-icon {
      font-size: 1.2rem;
      margin-top: 2px;
      flex-shrink: 0;
    }

    .article-content h4 {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 2px;
    }

    .article-content p {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    .article-source {
      font-size: 0.72rem;
      color: var(--primary);
      margin-top: 4px;
      font-weight: 500;
    }

    /* 表单 */
    .form-wrap {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
      align-items: start;
    }

    .form-intro h3 {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .form-intro p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 8px 0;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .contact-item strong {
      color: var(--text-dark);
      min-width: 72px;
    }

    .contact-item .qr-img {
      width: 80px;
      height: 80px;
      object-fit: contain;
      border-radius: 8px;
      border: 1px solid rgba(0, 0, 0, 0.06);
      margin-top: 6px;
    }

    .form-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 28px 26px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 0.84rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 5px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 11px 14px;
      font-size: 0.9rem;
      font-family: var(--font);
      border: 1.5px solid rgba(42, 92, 255, 0.15);
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.9);
      color: var(--text-main);
      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);
      box-shadow: 0 0 0 3px rgba(42, 92, 255, 0.1);
    }

    .form-group textarea {
      resize: vertical;
      min-height: 90px;
    }

    .form-btn {
      width: 100%;
      padding: 13px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: 100px;
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      color: #fff;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      font-family: var(--font);
    }

    .form-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(42, 92, 255, 0.35);
    }

    /* 页脚 */
    footer {
      position: relative;
      z-index: 1;
      background: rgba(255, 255, 255, 0.85);
      border-top: 1px solid rgba(0, 0, 0, 0.04);
      padding: 36px 0 22px;
      margin-top: 16px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 28px;
      margin-bottom: 24px;
    }

    .footer-brand p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-top: 8px;
      max-width: 280px;
    }

    .footer-col h4 {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .footer-col ul li a {
      font-size: 0.82rem;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid rgba(0, 0, 0, 0.05);
      padding-top: 16px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      font-size: 0.78rem;
      color: var(--text-light);
    }

    .footer-bottom a {
      color: var(--text-light);
      text-decoration: none;
    }

    .footer-bottom a:hover {
      color: var(--primary);
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      bottom: 28px;
      right: 24px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .float-kefu-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2a5cff, #7c3aed);
      color: #fff;
      border: none;
      font-size: 1.4rem;
      cursor: pointer;
      box-shadow: 0 8px 24px rgba(42, 92, 255, 0.35);
      transition: transform 0.25s;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .float-kefu-btn:hover {
      transform: scale(1.08);
    }

    .back-top {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(42, 92, 255, 0.2);
      color: var(--primary);
      font-size: 1.2rem;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      visibility: hidden;
    }

    .back-top.show {
      opacity: 1;
      visibility: visible;
    }

    .back-top:hover {
      background: var(--primary);
      color: #fff;
    }

    /* 滚动渐入 */
    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }

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

    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .tag-cloud span {
      display: inline-block;
      padding: 6px 16px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 100px;
      font-size: 0.82rem;
      color: var(--text-muted);
      transition: all 0.2s;
      cursor: default;
    }

    .tag-cloud span:hover {
      background: var(--primary-light);
      color: var(--primary);
      border-color: rgba(42, 92, 255, 0.2);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .about-flex { flex-direction: column; }
      .about-side { flex: 1 1 auto; width: 100%; }
      .form-wrap { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(16px);
        padding: 12px 20px;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
        gap: 0;
        z-index: 99;
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links li a {
        padding: 12px 0;
        font-size: 0.95rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.04);
        border-radius: 0;
      }

      .mobile-menu-btn {
        display: block;
      }

      .nav-cta .btn {
        padding: 8px 14px;
        font-size: 0.8rem;
      }

      .hero h1 {
        font-size: 1.8rem;
      }

      .hero-actions .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
      }

      .grid-3, .grid-2, .grid-4, .case-grid, .review-grid, .article-list {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .footer-brand p {
        max-width: 100%;
      }

      section {
        padding: 40px 0;
      }

      .steps {
        flex-direction: column;
        align-items: center;
      }

      .step-item {
        max-width: 100%;
        width: 100%;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }

      .hero {
        padding: 40px 0 32px;
      }

      .hero h1 {
        font-size: 1.5rem;
      }

      .hero-stats {
        gap: 10px 24px;
      }

      .hero-stat-num {
        font-size: 1.3rem;
      }

      .card {
        padding: 20px 18px;
      }

      .form-card {
        padding: 22px 18px;
      }
    }

    /* 锚点偏移 */
    [id] {
      scroll-margin-top: 70px;
    }