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

    body {
      font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      background: #f4f7fc;
      color: #0b1a2e;
      line-height: 1.5;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 配色 */
    :root {
      --deep-blue: #0a1628;
      --mid-blue: #132a44;
      --accent-orange: #f15a2c;
      --accent-glow: rgba(241, 90, 44, 0.25);
      --gray-light: #eef2f6;
      --gray-muted: #7c8ba0;
      --text-dark: #0b1a2e;
      --card-bg: #ffffff;
      --shadow-sm: 0 12px 30px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 24px 48px rgba(0, 20, 40, 0.12);
    }

    /* 导航 */
    .navbar {
      background: rgba(10, 22, 40, 0.92);
      backdrop-filter: blur(8px);
      padding: 14px 0;
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
    }

    .logo i {
      color: var(--accent-orange);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      font-weight: 500;
      font-size: 0.95rem;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.8);
      text-decoration: none;
      transition: 0.2s;
    }

    .nav-links a:hover {
      color: white;
    }

    .nav-cta {
      background: var(--accent-orange);
      padding: 8px 20px;
      border-radius: 40px;
      font-weight: 600;
      color: white !important;
      transition: 0.2s;
    }

    .nav-cta:hover {
      background: #d94a1e;
      transform: scale(1.02);
    }

    /* 通用 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.6rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 16px;
    }

    .section-sub {
      font-size: 1.2rem;
      color: var(--gray-muted);
      max-width: 720px;
      margin-bottom: 48px;
    }

    .text-center {
      text-align: center;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .card {
      background: var(--card-bg);
      border-radius: 28px;
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: 0.25s ease;
      border: 1px solid rgba(0, 0, 0, 0.02);
    }

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

    .badge {
      display: inline-block;
      background: var(--deep-blue);
      color: white;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 40px;
      letter-spacing: 0.3px;
      margin-bottom: 12px;
    }

    /* 首屏 hero */
    .hero {
      background: var(--deep-blue);
      color: white;
      padding: 60px 0 80px 0;
      position: relative;
      overflow: hidden;
    }

    .hero::after {
      content: '';
      position: absolute;
      right: -10%;
      top: -30%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(241, 90, 44, 0.08) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero .container {
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      max-width: 800px;
    }

    .hero h1 span {
      color: var(--accent-orange);
    }

    .hero-desc {
      font-size: 1.25rem;
      color: rgba(255, 255, 255, 0.7);
      max-width: 640px;
      margin: 24px 0 32px;
    }

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      margin-top: 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 32px;
    }

    .hero-stats div {
      display: flex;
      align-items: center;
      gap: 12px;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
    }

    .hero-stats i {
      color: var(--accent-orange);
      font-size: 1.4rem;
    }

    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 8px;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 14px 40px;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1rem;
      transition: 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .btn-primary:hover {
      background: #d94a1e;
      transform: scale(1.02);
      box-shadow: 0 12px 28px rgba(241, 90, 44, 0.3);
    }

    .btn-outline-light {
      background: transparent;
      color: white;
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 14px 32px;
      border-radius: 60px;
      font-weight: 500;
      transition: 0.2s;
      text-decoration: none;
    }

    .btn-outline-light:hover {
      background: rgba(255, 255, 255, 0.05);
      border-color: white;
    }

    /* 困境卡片 */
    .pain-card {
      background: white;
      border-radius: 24px;
      padding: 28px 24px;
      border-left: 6px solid var(--accent-orange);
      box-shadow: var(--shadow-sm);
      height: 100%;
    }

    .pain-card i {
      font-size: 2rem;
      color: var(--accent-orange);
      margin-bottom: 12px;
    }

    .pain-card h4 {
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    /* 原理对比 */
    .principle-box {
      background: white;
      border-radius: 28px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 16px;
    }

    .compare-table td {
      padding: 16px 12px;
      border-bottom: 1px solid #e9edf2;
      font-weight: 500;
    }

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

    .compare-table .old {
      color: #b0bccd;
    }

    .compare-table .new {
      color: var(--deep-blue);
      font-weight: 600;
    }

    .trust-icon {
      font-size: 3rem;
      color: var(--accent-orange);
      opacity: 0.3;
    }

    /* 功能卡片 */
    .func-icon {
      font-size: 2.6rem;
      background: rgba(10, 22, 40, 0.04);
      width: 72px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 24px;
      margin-bottom: 20px;
      color: var(--deep-blue);
    }

    .func-card h3 {
      font-size: 1.4rem;
      margin-bottom: 8px;
    }

    .func-card .tag {
      display: inline-block;
      background: var(--accent-orange);
      color: white;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 2px 12px;
      border-radius: 40px;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }

    /* 对比演示 (模拟) */
    .demo-pair {
      background: white;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-wrap: wrap;
    }

    .demo-side {
      flex: 1 1 260px;
      padding: 32px 24px;
      background: #fafcff;
    }

    .demo-side.danger {
      background: #fff5f2;
    }

    .demo-side .label {
      font-weight: 700;
      letter-spacing: 0.3px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .demo-side .status {
      margin-top: 16px;
      font-weight: 500;
    }

    .badge-red {
      background: #f15a2c;
      color: white;
      padding: 2px 12px;
      border-radius: 40px;
      font-size: 0.75rem;
    }

    .badge-green {
      background: #1f8b4c;
      color: white;
      padding: 2px 12px;
      border-radius: 40px;
      font-size: 0.75rem;
    }

    /* 用户 */
    .user-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 16px;
    }

    .user-item {
      background: white;
      border-radius: 40px;
      padding: 12px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      font-weight: 500;
      border: 1px solid transparent;
      transition: 0.2s;
    }

    .user-item:hover {
      border-color: var(--accent-orange);
    }

    /* 行业方案 */
    .industry-card {
      background: white;
      border-radius: 24px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border-top: 4px solid var(--deep-blue);
    }

    /* 信任 */
    .trust-pillar {
      text-align: center;
      padding: 24px 16px;
      background: white;
      border-radius: 28px;
      box-shadow: var(--shadow-sm);
    }

    .trust-pillar i {
      font-size: 2.4rem;
      color: var(--accent-orange);
      margin-bottom: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--deep-blue);
      color: white;
      border-radius: 48px;
      padding: 64px 40px;
      margin: 40px 0 60px;
    }

    .cta-section h2 {
      font-size: 2.4rem;
    }

    .cta-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
      margin: 24px 0 16px;
    }

    /* 响应式 */
    @media (max-width: 820px) {
      .grid-3 {
        grid-template-columns: 1fr 1fr;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 2.6rem;
      }
      .section-title {
        font-size: 2rem;
      }
      .navbar .container {
        flex-direction: column;
        gap: 12px;
      }
      .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
      }
    }

    @media (max-width: 540px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        flex-direction: column;
        gap: 16px;
      }
      .cta-section {
        padding: 36px 20px;
      }
    }

    /* 小标签 */
    .footnote {
      color: var(--gray-muted);
      font-size: 0.9rem;
      margin-top: 12px;
    }

    .border-glow {
      border: 1px solid rgba(241, 90, 44, 0.2);
    }

    .mt-4 { margin-top: 32px; }
    .mt-3 { margin-top: 24px; }
    .mb-2 { margin-bottom: 12px; }