:root {
      --primary: #38bdf8;
      --accent: #a78bfa;
      --bg: #0f172a;
      --text: #e2e8f0;
      --card-bg: #1e293b;
      --radius-lg: 24px;
      --radius-md: 16px;
      --shadow: 0 8px 20px rgba(0,0,0,0.25);
      --shadow-hover: 0 16px 36px rgba(56, 189, 248, 0.15);
      --font-title: 'Inter', 'Source Han Serif SC', 'Songti SC', serif;
      --font-body: 'Inter', 'Source Han Sans SC', 'PingFang SC', sans-serif;
    }

    * { scroll-behavior: smooth; }
    body {
      background-color: var(--bg);
      color: var(--text);
      font-family: var(--font-body);
      letter-spacing: 0.02em;
      overflow-x: hidden;
    }

    /* 滚动进度条 */
    #scroll-progress {
      position: fixed;
      top: 0; left: 0;
      height: 4px;
      width: 0%;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      z-index: 9999;
      transition: width 0.1s ease-out;
      border-radius: 4px;
    }

    /* 打字机效果 */
    @keyframes typing {
      from { width: 0; }
      to { width: 100%; }
    }
    @keyframes blink-caret {
      50% { border-color: transparent; }
    }
    .typewriter {
      display: inline-block;
      overflow: hidden;
      white-space: nowrap;
      border-right: 3px solid var(--primary);
      animation: typing 2.5s steps(30, end), blink-caret .75s step-end infinite;
      max-width: 100%;
    }

    /* 滚动显现动画 */
    .reveal {
      opacity: 0;
      transform: translateY(40px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }

    /* 卡片悬浮 */
    .hover-card {
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      border: 1px solid rgba(56, 189, 248, 0.12);
    }
    .hover-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* 胶囊式按钮与圆角 */
    .btn-pill {
      border-radius: 50rem !important;
      padding: 0.5rem 1.5rem;
      font-weight: 600;
    }
    .capsule-badge {
      background: rgba(167, 139, 250, 0.15);
      border-radius: 50rem;
      color: var(--accent);
      padding: 0.25rem 1rem;
      display: inline-block;
      font-size: 0.85rem;
      border: 1px solid rgba(167, 139, 250, 0.25);
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(15, 23, 42, 0.8);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(56, 189, 248, 0.1);
    }
    .navbar-brand {
      font-weight: 800;
      font-family: var(--font-title);
      color: var(--primary) !important;
      font-size: 1.6rem;
      letter-spacing: 1px;
    }
    .navbar-brand i {
      color: var(--accent);
      margin-right: 6px;
    }
    .nav-link-custom {
      color: var(--text) !important;
      font-weight: 500;
      margin: 0 0.6rem;
      transition: color 0.2s;
    }
    .nav-link-custom:hover {
      color: var(--primary) !important;
    }

    /* Hero区域 */
    .hero-full {
      min-height: 92vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.08), transparent 40%),
                  radial-gradient(circle at 80% 70%, rgba(167, 139, 250, 0.08), transparent 40%);
    }
    .hero-title {
      font-size: 3.8rem;
      font-weight: 900;
      font-family: var(--font-title);
      color: var(--primary);
      text-shadow: 0 0 30px rgba(56, 189, 248, 0.2);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: #cbd5e1;
      margin-top: 1.2rem;
    }

    /* 对比表格 */
    .table-compare {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow);
    }
    .table-compare .table {
      color: var(--text);
      margin-bottom: 0;
    }
    .table-compare .table td, .table-compare .table th {
      border-color: #334155;
      padding: 1rem 0.75rem;
      vertical-align: middle;
    }
    .table-compare .table th {
      background: #1e293b;
      font-weight: 600;
    }
    .fa-check-circle { color: var(--primary); }
    .fa-xmark-circle { color: #f87171; }

    /* FAQ手风琴 */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 1rem 1.5rem;
      margin-bottom: 1rem;
      border-left: 4px solid var(--accent);
    }

    /* 页脚 */
    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      margin: 0 0.8rem;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: var(--primary); }

    .link-block {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 1.2rem;
      border: 1px solid #334155;
    }

    /* 大数字强调 */
    .big-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }

    /* 小标签 */
    .section-label {
      letter-spacing: 2px;
      color: var(--accent);
      font-weight: 600;
      text-transform: uppercase;
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 768px) {
      .hero-title { font-size: 2.5rem; }
      .typewriter { white-space: normal; border-right: none; animation: none; }
    }