/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --secondary: #0EA5E9;
      --accent: #F97316;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --success: #10B981;
      --error: #EF4444;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-element: 8px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 4px 6px rgba(0,0,0,0.04), 0 12px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      color: var(--text);
      background-color: var(--bg);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .en-font {
      font-family: var(--font-en), var(--font-sans);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 焦点可见 */
    :focus-visible {
      outline: 2px solid var(--secondary);
      outline-offset: 2px;
      border-radius: 4px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      padding: 14px 32px;
      border-radius: var(--radius-element);
      cursor: pointer;
      text-align: center;
      transition: all 0.2s ease;
      border: none;
      background: transparent;
      line-height: 1.2;
      font-family: var(--font-sans);
    }

    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: none;
    }

    .btn-primary:hover {
      background-color: #EA580C;
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-text {
      background: transparent;
      border: none;
      color: var(--secondary);
      padding: 8px 0;
    }

    .btn-text:hover {
      text-decoration: underline;
    }

    .btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
      pointer-events: none;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.2s;
    }

    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 700;
      font-size: 24px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-en);
      letter-spacing: -0.5px;
    }

    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text);
      cursor: pointer;
      padding: 8px;
    }

    /* 英雄区 */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(26,95,122,0.25) 0%, rgba(0,0,0,0.5) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      margin-top: 0;
      padding-top: 72px;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 40px;
      max-width: 600px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    .section {
      padding: 120px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }

    .section-header h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 16px;
    }

    .section-header p {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 600px;
      margin: 0 auto;
    }

    .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);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card img {
      border-radius: 8px;
      object-fit: cover;
      width: 100%;
      height: auto;
      margin-bottom: 24px;
    }

    .card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .card p {
      color: var(--text-secondary);
      font-size: 16px;
      margin-bottom: 20px;
      flex: 1;
    }

    .tag {
      background: #E0F2FE;
      color: #0369A1;
      font-size: 12px;
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      width: fit-content;
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    /* 证言 */
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .testimonial-text {
      font-size: 16px;
      font-style: italic;
      color: var(--text);
    }

    .author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 12px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--border-light);
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-size: 18px;
      font-weight: 500;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0;
      color: #475569;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-icon {
      font-size: 24px;
      color: var(--secondary);
    }

    /* CTA 终局 */
    .cta-band {
      background: var(--primary);
      color: white;
      padding: 100px 0;
      text-align: center;
      border-radius: 0;
    }

    .cta-band h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 20px;
    }

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

    .footer a {
      color: #CBD5E1;
    }

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

    .copyright {
      color: #94A3B8;
      font-size: 14px;
      text-align: center;
      border-top: 1px solid #334155;
      padding-top: 20px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 640px) {
      .section { padding: 80px 0; }
      .hero { min-height: 70vh; }
      .hero h1 { font-size: 32px; }
      .section-header h2 { font-size: 28px; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .mobile-menu.active { display: flex; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn { width: 100%; }
      .hero-buttons { flex-direction: column; }
    }

    .mobile-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      box-shadow: 0 4px 6px rgba(0,0,0,0.1);
      gap: 16px;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }