/* ===== 基础变量与重置 ===== */
    :root {
      --bg: #f5f7fb;
      --ink: #0f1825;
      --muted: #54657f;
      --line: #e2e8f0;
      --panel: #ffffff;
      --blue: #1a73e8;
      --blue-dark: #0d5bbf;
      --blue-light: #e8f0fe;
      --mint: #0f9d6b;
      --amber: #e68a2e;
      --shadow-sm: 0 2px 8px rgba(15, 25, 45, 0.04);
      --shadow-md: 0 8px 30px rgba(15, 25, 45, 0.08);
      --shadow-lg: 0 20px 60px rgba(15, 25, 45, 0.10);
      --radius: 12px;
      --radius-sm: 8px;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
      text-size-adjust: 100%;
      tab-size: 4;
    }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: var(--bg);
      color: var(--ink);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition);
      -webkit-tap-highlight-color: rgba(26, 115, 232, 0.15);
    }
    a:hover { color: var(--blue); }
    img {
      display: block;
      max-width: 100%;
      height: auto;
      font-style: italic;
      background: linear-gradient(135deg, #eef4ff 0%, #ffffff 80%);
    }
    /* 可点击区域最小 44x44（Apple HIG / WCAG） */
    .nav a, .button, .faq summary { touch-action: manipulation; }
    button { -webkit-appearance: none; appearance: none; }

    /* ===== 跳转链接 ===== */
    .skip-link {
      position: absolute;
      top: -100%;
      left: 18px;
      z-index: 20;
      padding: 10px 18px;
      border-radius: 0 0 6px 6px;
      background: var(--ink);
      color: #fff;
      font-weight: 700;
    }
    .skip-link:focus { top: 0; }

    /* ===== 头部导航 ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      padding: 12px clamp(18px, 4vw, 56px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      background: rgba(245, 247, 251, 0.88);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.15rem;
      white-space: nowrap;
    }
    .brand-mark {
      display: inline-grid;
      place-items: center;
      width: 38px;
      height: 38px;
      border-radius: var(--radius-sm);
      background: var(--ink);
      color: #fff;
      font-size: 14px;
      letter-spacing: 0;
    }
    .nav {
      display: flex;
      align-items: center;
      gap: 24px;
      color: var(--muted);
      font-size: 0.95rem;
      font-weight: 500;
    }
    .nav a { position: relative; }
    .nav a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--blue);
      transition: width var(--transition);
    }
    .nav a:hover::after { width: 100%; }
    .nav a:hover { color: var(--ink); }
    .nav-cta {
      padding: 8px 20px;
      border-radius: 40px;
      background: var(--blue);
      color: #fff !important;
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(26, 115, 232, 0.30);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    }
    .nav-cta::after { display: none !important; }
    .nav-cta:hover {
      background: var(--blue-dark);
      transform: translateY(-1px);
      box-shadow: 0 8px 24px rgba(26, 115, 232, 0.35);
      color: #fff !important;
    }

    /* ===== 面包屑 ===== */
    .breadcrumb {
      width: min(1120px, calc(100% - 36px));
      margin: 16px auto 0;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      color: var(--muted);
    }
    .breadcrumb a { color: var(--blue); font-weight: 500; }
    .breadcrumb a:hover { text-decoration: underline; }
    .breadcrumb span[aria-hidden] { color: var(--line); }

    /* ===== 通用容器 ===== */
    .section, .band, .cta, .notice, .article {
      width: min(1120px, calc(100% - 36px));
      margin-inline: auto;
    }
    .section { padding: clamp(48px, 6vw, 80px) 0; }

    /* ===== 英雄区（H1 + Hero-visual 优化重点） ===== */
    .hero {
      display: grid;
      grid-template-columns: minmax(0, 1.02fr) minmax(280px, 0.98fr);
      gap: clamp(28px, 5vw, 64px);
      align-items: center;
      min-height: calc(100vh - 72px);
      padding: clamp(36px, 6vw, 72px) clamp(18px, 4vw, 56px) 32px;
      width: 100%;
    }

    /* —— H1 标题升级 —— */
    .hero h1 {
      margin: 0;
      line-height: 1.12;
      letter-spacing: -0.02em;
     
      font-weight: 800;
      /* 渐变文字 + 阴影 */
      background: linear-gradient(145deg, #0f1825 0%, #1a73e8 70%, #4a8cf7 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 4px 20px rgba(26, 115, 232, 0.15);
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.02));
    }

    .hero-copy {
      max-width: 720px;
      margin: 20px 0 0;
      color: var(--muted);
      font-size: clamp(16px, 1.8vw, 20px);
    }
    .eyebrow {
      margin: 0 0 10px;
      color: var(--blue);
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      margin-top: 28px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 10px 24px;
      border: 1px solid transparent;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.95rem;
      line-height: 1.2;
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
      cursor: pointer;
    }
    .button:hover { transform: translateY(-2px); }
    .button.primary {
      background: var(--blue);
      color: #fff;
      box-shadow: 0 8px 24px rgba(26, 115, 232, 0.25);
    }
    .button.primary:hover {
      background: var(--blue-dark);
      box-shadow: 0 12px 32px rgba(26, 115, 232, 0.35);
    }
    .button.secondary {
      border-color: var(--line);
      background: #fff;
      color: var(--ink);
      box-shadow: var(--shadow-sm);
    }
    .button.secondary:hover {
      border-color: var(--blue);
      color: var(--blue);
      box-shadow: var(--shadow-md);
    }

    .trust-strip {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      max-width: 720px;
      margin: 30px 0 0;
    }
    .trust-strip div {
      padding: 14px 16px;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid var(--line);
      backdrop-filter: blur(4px);
    }
    .trust-strip dt {
      color: var(--muted);
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }
    .trust-strip dd {
      margin: 2px 0 0;
      font-weight: 700;
      font-size: 1.05rem;
    }

    /* —— Hero-visual 升级 —— */
    .hero-visual {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius);
      background: linear-gradient(135deg, #eef4ff 0%, #ffffff 80%);
      box-shadow: var(--shadow-md), inset 0 0 0 1px rgba(26, 115, 232, 0.08);
      padding: 28px 20px 20px;
      text-align: center;
      border: none;
      transition: transform var(--transition), box-shadow var(--transition);
      backdrop-filter: blur(2px);
    }
    .hero-visual:hover {
      transform: translateY(-6px) scale(1.01);
      box-shadow: var(--shadow-lg), inset 0 0 0 1px rgba(26, 115, 232, 0.20);
    }
    .hero-visual svg {
      display: block;
      margin: 0 auto;
      width: 100%;
      max-width: 200px;
      height: auto;
    }
    /* 装饰性悬浮标签 */
    .hero-visual .badge-group {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-top: 14px;
      flex-wrap: wrap;
    }
    .hero-visual .badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 4px 12px;
      border-radius: 40px;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      border: 1px solid rgba(26, 115, 232, 0.15);
      font-size: 0.7rem;
      font-weight: 600;
      color: var(--blue);
      box-shadow: var(--shadow-sm);
    }
    .hero-visual .badge .dot {
      display: inline-block;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: #34a853;
      margin-right: 2px;
    }

    /* ===== 通知条 ===== */
    .notice {
      padding: 14px 20px;
      border-left: 5px solid var(--amber);
      border-radius: var(--radius-sm);
      background: #fef9f0;
      color: #7a5a2a;
      font-size: 0.95rem;
    }

    /* ===== 服务卡片 ===== */
    .section-head {
      max-width: 720px;
      margin-bottom: 32px;
    }
    .section-head h2, .band h2, .cta h2, .article h1 {
      font-size: clamp(28px, 3.6vw, 42px);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin: 0;
    }
    .section-head p, .band p, .cta p {
      color: var(--muted);
      margin-top: 8px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 18px;
    }
    .card {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--panel);
      box-shadow: var(--shadow-sm);
      padding: 24px 22px;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--blue);
    }
    .icon {
      display: inline-grid;
      place-items: center;
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--blue-light);
      color: var(--blue);
      font-weight: 800;
      font-size: 1.1rem;
    }
    .card h3 { margin: 16px 0 8px; font-size: 1.15rem; }
    .card p { color: var(--muted); font-size: 0.95rem; margin: 4px 0; }
    .card p strong { color: var(--ink); }

    /* ===== 深色横幅 ===== */
    .band {
      display: grid;
      grid-template-columns: 0.85fr 1.15fr;
      gap: 28px;
      align-items: start;
      padding: clamp(28px, 5vw, 48px);
      border-radius: var(--radius);
      background: #0f1825;
      color: #fff;
      box-shadow: var(--shadow-lg);
    }
    .band .eyebrow { color: #7ad0b0; }
    .band h2 { color: #fff; }
    .band p { color: #c8d6e8; margin: 0; }

    /* ===== 两列布局 ===== */
    .two-col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .check-panel, .steps {
      padding: clamp(24px, 4vw, 36px);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--panel);
      box-shadow: var(--shadow-sm);
    }
    .check-panel h2, .steps h2 { margin: 0 0 12px; font-size: 1.4rem; }
    .checks, .steps ol { padding-left: 22px; }
    .checks li, .steps li { margin: 10px 0; color: var(--muted); }
    .check-panel .button { margin-top: 16px; }

    /* ===== 文章网格 ===== */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }
    .article-card {
      padding: 22px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--panel);
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .article-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--blue);
    }
    .article-card p { margin: 0 0 10px; color: var(--mint); font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
    .article-card h3 { margin: 0 0 6px; font-size: 1.1rem; }
    .article-card h3 a:hover { color: var(--blue); }
    .article-card span { color: var(--muted); font-size: 0.95rem; }

    /* ===== FAQ ===== */
    .faq { padding-top: 12px; }
    .faq details {
      margin-top: 12px;
      padding: 16px 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--panel);
      box-shadow: var(--shadow-sm);
      transition: border-color var(--transition), box-shadow var(--transition);
      cursor: pointer;
    }
    .faq details:hover { border-color: var(--blue); }
    .faq details[open] { border-color: var(--blue); box-shadow: var(--shadow-md); }
    .faq summary {
      font-weight: 700;
      font-size: 1.02rem;
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }
    .faq summary::-webkit-details-marker { display: none; }
    .faq summary::after {
      content: '+';
      font-size: 1.3rem;
      font-weight: 300;
      color: var(--blue);
      transition: transform var(--transition);
      flex-shrink: 0;
    }
    .faq details[open] summary::after { transform: rotate(45deg); }
    .faq details p {
      margin: 12px 0 0;
      color: var(--muted);
      padding-top: 12px;
      border-top: 1px solid var(--line);
      font-size: 0.95rem;
    }

    /* ===== CTA 区块 ===== */
    .cta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 48px;
      padding: clamp(24px, 4vw, 40px);
      border-radius: var(--radius);
      background: var(--panel);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--line);
    }
    .cta p { margin-bottom: 0; }

    /* ===== 底部内链 ===== */
    .footer-links {
      width: min(1120px, calc(100% - 36px));
      margin: 0 auto 36px;
      padding: 20px 0;
      border-top: 1px solid var(--line);
      font-size: 0.9rem;
      color: var(--muted);
      display: flex;
      flex-wrap: wrap;
      gap: 18px 28px;
      justify-content: center;
    }
    .footer-links a { font-weight: 500; }
    .footer-links a:hover { color: var(--blue); }
    .footer-links span { opacity: 0.5; }
    .footer-links .ref strong { color: var(--ink); }

    /* ===== 页脚 ===== */
    .site-footer {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      padding: 24px clamp(18px, 4vw, 56px);
      border-top: 1px solid var(--line);
      color: var(--muted);
      font-size: 0.85rem;
      background: var(--bg);
    }
    .site-footer a { font-weight: 500; }
    .site-footer a:hover { color: var(--blue); }

    /* ===== 响应式：平板 ===== */
    @media (max-width: 900px) {
      .site-header {
        flex-direction: row;
        align-items: center;
        gap: 12px;
        padding: 10px 18px;
      }
      .site-header .brand span:last-child { display: none; }
      .nav { width: auto; overflow-x: auto; padding-bottom: 4px; gap: 14px; font-size: 0.88rem; }
      .nav-cta { padding: 7px 16px; font-size: 0.88rem; }
      .hero {
        grid-template-columns: 1fr;
        min-height: auto;
        padding: 32px 18px 24px;
        gap: 24px;
      }
      .hero-visual { order: -1; padding: 18px 14px 14px; }
      .hero-visual img { max-width: 360px; margin: 0 auto; }
      .hero-visual .badge-group { gap: 8px; margin-top: 10px; }
      .hero-visual .badge { font-size: 0.65rem; padding: 3px 10px; }
      .two-col { grid-template-columns: 1fr; }
      .band { grid-template-columns: 1fr; padding: 28px 24px; gap: 16px; }
      .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .article-grid { grid-template-columns: 1fr; }
      .breadcrumb { padding: 10px 18px 0; margin: 0; }
      .section-head h2, .band h2, .cta h2 { font-size: 24px; }
      .section-head p, .band p, .cta p { font-size: 0.95rem; }
      .card { padding: 20px 18px; }
      .check-panel, .steps { padding: 22px 20px; }
    }

    /* ===== 响应式：手机（大） ===== */
    @media (max-width: 640px) {
      body { line-height: 1.65; font-size: 15px; }
      .site-header { padding: 8px 14px; gap: 8px; }
      .brand-mark { width: 34px; height: 34px; font-size: 13px; }
      .nav { gap: 10px; }
      .nav a:not(.nav-cta) { font-size: 0.85rem; padding: 4px 0; }
      .nav-cta { padding: 6px 14px; font-size: 0.82rem; min-height: 36px; }
      .hero { padding: 24px 14px 20px; }
      .hero h1 {
        font-size: 26px !important;
        line-height: 1.25;
        letter-spacing: -0.01em;
      }
      .hero-copy { font-size: 15px; line-height: 1.7; margin-top: 14px; }
      .hero-actions { margin-top: 18px; gap: 10px; flex-direction: column; }
      .hero-actions .button { width: 100%; min-height: 50px; font-size: 0.95rem; }
      .trust-strip {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
        margin-top: 20px;
      }
      .trust-strip div { padding: 10px 8px; text-align: center; }
      .trust-strip dt { font-size: 0.68rem; }
      .trust-strip dd { font-size: 0.85rem; }
      .hero-visual { padding: 14px 10px; }
      .hero-visual img { max-width: 280px; }
      .hero-visual .badge-group { flex-direction: row; flex-wrap: wrap; justify-content: center; }
      .hero-visual .badge-group .badge { flex: 1 1 auto; text-align: center; justify-content: center; }
      .section { padding: 36px 0; width: calc(100% - 24px); }
      .section-head { margin-bottom: 20px; }
      .section-head h2 { font-size: 22px !important; }
      .service-grid { grid-template-columns: 1fr; gap: 12px; }
      .card { padding: 18px 16px; }
      .card h3 { font-size: 1.05rem; }
      .card p { font-size: 0.88rem; }
      .band { padding: 24px 18px; }
      .band h2 { font-size: 20px; }
      .band p { font-size: 0.92rem; line-height: 1.7; }
      .check-panel h2, .steps h2 { font-size: 1.2rem; }
      .checks li, .steps li { font-size: 0.92rem; margin: 8px 0; }
      .article-card { padding: 18px 16px; }
      .article-card h3 { font-size: 1rem; }
      .article-card span { font-size: 0.88rem; }
      .faq details { padding: 14px 16px; }
      .faq summary { font-size: 0.95rem; }
      .faq details p { font-size: 0.9rem; }
      .cta { padding: 24px 18px; margin-bottom: 32px; gap: 14px; }
      .cta h2 { font-size: 22px; }
      .cta p { font-size: 0.92rem; }
      .cta .button { width: 100%; min-height: 50px; }
      .button.primary { font-size: 1rem; }
      .button { min-height: 48px; padding: 12px 22px; }
      .notice { padding: 12px 16px; font-size: 0.88rem; }
      .footer-links {
        flex-direction: column;
        align-items: center;
        gap: 12px;
        padding: 18px 14px;
        font-size: 0.85rem;
      }
      .footer-links .ref { text-align: center; line-height: 1.6; }
      .footer-divider { display: none; }
      .site-footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 18px 14px;
        gap: 8px;
      }
      .site-footer p { font-size: 0.82rem; }
      .footer-meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 10px; font-size: 0.8rem; }
    }

    /* ===== 响应式：手机（小） ===== */
    @media (max-width: 380px) {
      .hero h1 { font-size: 23px !important; }
      .section-head h2 { font-size: 20px !important; }
      .cta h2 { font-size: 20px; }
      .trust-strip { grid-template-columns: 1fr; }
      .trust-strip div { padding: 12px; }
    }

    /* ===== 安全区域适配（iPhone 刘海屏） ===== */
    @supports (padding: env(safe-area-inset-top)) {
      .site-header { padding-top: max(8px, env(safe-area-inset-top)); }
      .site-footer { padding-bottom: max(18px, env(safe-area-inset-bottom)); }
    }
    @media print {
      .site-header, .nav, .skip-link, .hero-actions, .site-footer, .footer-links { display: none; }
      body { background: #fff; color: #000; font-size: 12px; line-height: 1.5; }
      .card, .check-panel, .steps, .article-card, .faq details { border: 1px solid #ccc; box-shadow: none; break-inside: avoid; }
    }

    /* ===== 辅助类 ===== */
    .text-center { text-align: center; }
    .mt-24 { margin-top: 24px; }