/* roulang page: index */
:root {
      --primary: #0A2540;
      --secondary: #00C49A;
      --accent: #FF6B35;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --border: #E2E8F0;
      --text-main: #1E293B;
      --text-secondary: #475569;
      --text-muted: #94A3B8;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-large: 16px;
      --font-h1: 2.25rem;
      --font-h2: 1.75rem;
      --font-h3: 1.25rem;
      --font-body: 1rem;
      --font-small: 0.875rem;
      --transition: all 0.2s ease;
    }

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

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: var(--transition);
      font-family: inherit;
      white-space: nowrap;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      height: 64px;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo i {
      color: var(--secondary);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.2s ease;
    }

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

    .btn-primary {
      background: var(--secondary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      font-weight: 600;
    }

    .btn-primary:hover {
      background: #00a77e;
      box-shadow: 0 4px 12px rgba(0,196,154,0.3);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary);
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: rgba(255,255,255,0.97);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      z-index: 200;
    }

    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--primary);
    }

    .mobile-menu .btn-primary {
      font-size: 1.2rem;
      padding: 14px 32px;
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding: 70px 0;
      min-height: 85vh;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .btn-outline {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(0,196,154,0.06);
      border-color: #00a77e;
      color: #00a77e;
    }

    .hero-image {
      flex: 1 1 50%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 420px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
    }

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

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: var(--font-h2);
      font-weight: 600;
      color: var(--primary);
    }

    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 12px auto 0;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,196,154,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 1.6rem;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: var(--font-h3);
      font-weight: 600;
      margin-bottom: 10px;
    }

    .feature-card p {
      color: var(--text-secondary);
    }

    /* 步骤条 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      text-align: center;
      position: relative;
      gap: 16px;
    }

    .step-item {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      border: 1px solid var(--border);
      position: relative;
    }

    .step-number {
      width: 40px;
      height: 40px;
      background: var(--secondary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }

    .stat-item {
      background: var(--card-bg);
      padding: 32px 16px;
      border-radius: var(--radius-large);
      border: 1px solid var(--border);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
      font-variant-numeric: tabular-nums;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

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

    .faq-question {
      width: 100%;
      background: #F1F5F9;
      border: none;
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1rem;
      color: var(--primary);
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #E2E8F0;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
      padding: 0 20px;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-form input, .contact-form select, .contact-form textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-input);
      font-family: inherit;
      margin-bottom: 16px;
      transition: 0.2s;
    }

    .contact-form input:focus, .contact-form select:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 3px rgba(0,196,154,0.2);
      outline: none;
    }

    .btn-submit {
      background: var(--accent);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .qr-box img {
      width: 120px;
      border-radius: 8px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CBD5E1;
      padding: 48px 0 24px;
    }

    .footer-links {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin: 20px 0;
    }

    .footer-links a {
      background: rgba(255,255,255,0.08);
      padding: 6px 16px;
      border-radius: 40px;
      font-size: 0.85rem;
    }

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

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .header { height: 56px; }
      .nav-links, .nav .btn-primary { display: none; }
      .hamburger { display: flex; }
      .hero { flex-direction: column; text-align: center; padding: 40px 0; }
      .hero-image { width: 100%; height: 280px; }
      .hero h1 { font-size: 1.8rem; }
      .grid-3 { grid-template-columns: 1fr; }
      .steps { flex-direction: column; }
      .contact-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }