/* roulang page: index */
:root {
      --color-primary: #1f6f5f;
      --color-primary-dark: #155347;
      --color-accent: #d9a441;
      --color-accent-dark: #b8892f;
      --color-bg: #ffffff;
      --color-alt-bg: #f8faf9;
      --color-text: #1f2937;
      --color-muted: #6b7280;
      --color-border: #e5e7eb;
      --radius: 16px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.1);
      --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.15);
    }
    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      line-height: 1.6;
      color: var(--color-text);
      background: var(--color-bg);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    button, input, select, textarea {
      font: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
      position: sticky;
      top: 0;
      z-index: 60;
    }
    .nav-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--color-primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-logo span {
      color: var(--color-accent);
    }
    .nav-link {
      color: #4b5563;
      padding: 8px 16px;
      border-radius: 9999px;
      font-weight: 500;
      transition: all 0.2s ease;
    }
    .nav-link:hover,
    .nav-link.active {
      background: #e8f5f0;
      color: var(--color-primary);
    }
    .btn-primary {
      background: var(--color-primary);
      color: #fff;
      padding: 12px 26px;
      border-radius: 9999px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.3s ease;
      box-shadow: 0 6px 16px rgba(31, 111, 95, 0.25);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--color-primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(31, 111, 95, 0.35);
    }
    .btn-outline {
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      background: transparent;
      padding: 12px 26px;
      border-radius: 9999px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.3s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--color-primary);
      color: #fff;
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--color-accent);
      color: #3d2e0a;
      padding: 12px 26px;
      border-radius: 9999px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.3s ease;
      box-shadow: 0 6px 16px rgba(217, 164, 65, 0.25);
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: var(--color-accent-dark);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(217, 164, 65, 0.35);
    }
    .card {
      background: #fff;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      background: #e8f5f0;
      color: var(--color-primary);
      flex-shrink: 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #1f2937;
      margin-bottom: 0.5em;
      letter-spacing: -0.01em;
    }
    .section-subtitle {
      color: var(--color-muted);
      line-height: 1.7;
      max-width: 720px;
      font-size: 1.1rem;
    }
    .hero {
      background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.4)), url('/assets/images/backpic/back-1.jpg');
      background-size: cover;
      background-position: center;
      padding: 80px 0 80px;
      position: relative;
      color: #fff;
    }
    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1.2fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .hero-value-item {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 16px;
      padding: 16px;
      color: #fff;
      transition: background 0.3s ease, transform 0.3s ease;
    }
    .hero-value-item:hover {
      background: rgba(255, 255, 255, 0.2);
      transform: translateY(-2px);
    }
    .hero-screenshot {
      border-radius: 20px;
      box-shadow: var(--shadow-xl);
      border: 4px solid #fff;
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .section {
      padding: 64px 0;
    }
    .section-alt {
      background: var(--color-alt-bg);
    }
    .icon-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 20px;
    }
    .icon-card {
      text-align: center;
      padding: 24px 12px;
      background: #fff;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: block;
    }
    .icon-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      background: #f0fdfa;
    }
    .icon-card .icon {
      font-size: 2rem;
      color: var(--color-primary);
      display: block;
      margin-bottom: 8px;
    }
    .icon-card .label {
      font-weight: 600;
      font-size: 1rem;
      color: #1f2937;
    }
    .resource-list-item {
      display: flex;
      gap: 20px;
      padding: 20px;
      border-bottom: 1px solid var(--color-border);
      transition: background 0.2s ease;
    }
    .resource-list-item:hover {
      background: #f9fafb;
    }
    .tag {
      background: #e8f5f0;
      color: var(--color-primary);
      padding: 4px 12px;
      border-radius: 9999px;
      font-size: 0.8rem;
      font-weight: 500;
      display: inline-block;
    }
    .tag-accent {
      background: #fef3e2;
      color: #a16207;
    }
    .coupon-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .coupon-card {
      background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
      border: 1px dashed var(--color-accent);
      border-radius: 16px;
      padding: 24px;
      position: relative;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .coupon-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .faq-item {
      background: #fff;
      border-radius: 12px;
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 16px;
      transition: box-shadow 0.3s ease;
    }
    .faq-item:hover {
      box-shadow: var(--shadow-md);
    }
    .footer {
      background: #1f2937;
      color: #d1d5db;
      padding: 48px 0 24px;
    }
    a:focus-visible,
    button:focus-visible {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }
    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .hero-value-item {
        display: flex;
        align-items: center;
        gap: 12px;
      }
      .icon-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .coupon-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .icon-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .coupon-grid {
        grid-template-columns: 1fr;
      }
      .resource-list-item {
        flex-direction: column;
      }
      .section {
        padding: 40px 0;
      }
      .section-title {
        font-size: 1.5rem;
      }
    }
    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }
      .btn-primary,
      .btn-outline,
      .btn-accent {
        padding: 10px 18px;
        font-size: 0.9rem;
      }
      .nav-logo {
        font-size: 1.2rem;
      }
    }