/* roulang page: index */
:root {
      --primary: #0A2540;
      --secondary: #00A3E0;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,163,224,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-badge: 20px;
      --transition: 0.25s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 1000;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      color: var(--primary);
      font-weight: 500;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(255,107,53,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(255,107,53,0.35);
    }
    .btn-primary:active {
      background: #cc4a1f;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .btn-secondary:hover {
      background: var(--secondary);
      color: white;
    }
    .badge {
      background: rgba(255,107,53,0.1);
      color: var(--accent);
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: var(--radius-badge);
      white-space: nowrap;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
      z-index: 1001;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: 100vh;
      background: white;
      flex-direction: column;
      gap: 28px;
      padding: 40px 32px;
      z-index: 999;
      backdrop-filter: blur(16px);
      background: rgba(255,255,255,0.98);
    }
    .mobile-menu a {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(10,37,64,0.85) 0%, rgba(10,37,64,0.5) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      margin-top: 0;
      padding-top: 72px;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: clamp(36px, 6vw, 56px);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .abstract-graphic {
      width: 320px;
      height: 320px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, rgba(0,163,224,0.25), transparent 70%);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: clamp(32px, 5vw, 40px);
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 48px;
      max-width: 700px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: rgba(0,163,224,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--secondary);
    }
    .card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .card p {
      color: var(--text-muted);
    }
    .divider-line {
      width: 40px;
      height: 4px;
      background: var(--secondary);
      margin: 12px 0 16px;
      border-radius: 2px;
    }
    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      padding: 32px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.2;
    }
    .stat-unit {
      font-size: 20px;
      font-weight: 600;
      margin-left: 4px;
    }
    /* 证言 */
    .testimonial-card {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: #ddd;
      flex-shrink: 0;
      overflow: hidden;
    }
    .stars {
      color: var(--secondary);
      letter-spacing: 2px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      color: var(--text-muted);
      margin-top: 12px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA 深色 */
    .dark-cta {
      background: var(--primary);
      color: white;
      border-radius: 24px;
      padding: 60px 40px;
      text-align: center;
    }
    .dark-cta h2 {
      color: white;
    }
    /* 页脚 */
    footer {
      background: var(--primary);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
    }
    footer a {
      color: rgba(255,255,255,0.7);
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--secondary);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta .badge { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-2, .stats-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
      .hero-visual { order: -1; }
      section { padding: 60px 0; }
      .testimonial-card { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }