/* roulang page: index */
:root {
      --primary: #C8102E;
      --primary-hover: #A00C25;
      --accent: #F5A623;
      --bg-light: #F9F9FB;
      --bg-dark: #1C1C1E;
      --text-main: #1C1C1E;
      --text-secondary: #6B6B6B;
      --text-light: #B0B0B0;
      --white: #FFFFFF;
      --border: #E8E8EC;
      --success: #0FA958;
      --radius-card: 10px;
      --radius-btn: 6px;
      --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
      --container-width: 1200px;
      --gap: 24px;
      --section-padding: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    h1, h2, h3 {
      line-height: 1.2;
      font-weight: 700;
    }
    .section {
      padding: var(--section-padding) 0;
    }
    /* 导航 */
    .site-header {
      background: var(--white);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid var(--border);
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--text-main);
      font-weight: 700;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 18px;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .channel-row {
      display: flex;
      gap: 0;
      overflow-x: auto;
      white-space: nowrap;
      padding: 8px 0;
    }
    .channel-row a {
      display: inline-block;
      padding: 10px 18px;
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-main);
      border-bottom: 3px solid transparent;
      transition: 0.2s;
    }
    .channel-row a:hover,
    .channel-row a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--text-main);
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .channel-row {
        display: none;
        flex-direction: column;
        background: var(--bg-dark);
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        padding: 12px 0;
      }
      .channel-row.open {
        display: flex;
      }
      .channel-row a {
        color: var(--white);
        padding: 14px 20px;
        border-bottom: none;
      }
      .channel-row a:hover {
        background: rgba(255,255,255,0.08);
      }
    }
    /* Hero */
    .hero {
      background: var(--bg-dark);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 110px 0 100px;
      display: flex;
      align-items: center;
      color: var(--white);
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(28,28,30,0.85) 0%, rgba(200,16,46,0.5) 100%);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 28px;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--bg-dark);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      transition: 0.2s;
    }
    .btn-primary:hover {
      background: #e09418;
    }
    .btn-outline {
      border: 2px solid var(--white);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      background: transparent;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero .subtitle {
        font-size: 1.1rem;
      }
      .section {
        padding: 50px 0;
      }
    }
    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      gap: var(--gap);
    }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .grid-4, .grid-3 { grid-template-columns: 1fr; }
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: 0.25s;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .card-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
    }
    .card-body {
      padding: 20px 24px;
    }
    .card-icon {
      width: 54px;
      height: 54px;
      background: rgba(200,16,46,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      color: var(--primary);
      font-size: 1.6rem;
    }
    .tag {
      background: var(--primary);
      color: white;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      display: inline-block;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .section-desc {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 40px;
    }
    /* 数据指标 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 28px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    /* 流程 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 20px;
    }
    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 12px;
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 16px;
      color: #4A4A4A;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }
    .input-field {
      width: 100%;
      padding: 14px;
      border: 1px solid #D1D1D6;
      border-radius: var(--radius-btn);
      margin-bottom: 14px;
      font-size: 1rem;
    }
    .input-field:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(200,16,46,0.1);
      outline: none;
    }
    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: var(--text-light);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 18px;
      text-align: center;
      font-size: 0.85rem;
      color: #6B6B6B;
    }