/* roulang page: index */
:root {
      --primary: #0B2B26;
      --accent: #E85D04;
      --accent-hover: #C94C00;
      --bg: #F5F3EE;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #5C5C5C;
      --border: #E0DCD5;
      --success: #2D6A4F;
      --danger: #D00000;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 0.2s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --section-gap: 80px;
      --section-gap-mobile: 56px;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

    h1, h2, h3 {
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 28px;
      font-weight: 600;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .section {
      padding: var(--section-gap) 0;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: #FFFFFF;
      height: 64px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      font-size: 24px;
      color: var(--accent);
    }

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

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--primary);
    }

    .mobile-nav {
      display: none;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-secondary:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F5F3EE 0%, #E8E5DF 100%);
      padding: 0 0 var(--section-gap);
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 45%;
    }

    .hero-content h1 {
      margin-bottom: 16px;
      color: var(--primary);
    }

    .hero-content .subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .hero-image {
      flex: 1 1 45%;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      background-color: #d1ccc0;
      position: relative;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .advantage-card {
      background: var(--card-bg);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-bottom: 4px solid transparent;
    }

    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-bottom-color: var(--accent);
    }

    .advantage-icon {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .advantage-card h3 {
      margin-bottom: 12px;
    }

    /* 服务矩阵 */
    .service-block {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-top: 40px;
    }

    .service-image {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: var(--radius-card);
      background-color: #c4bcb0;
    }

    .service-list {
      flex: 1 1 50%;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .service-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border);
    }

    .service-item:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .service-icon {
      font-size: 24px;
      color: var(--accent);
      width: 32px;
      text-align: center;
    }

    .service-text h3 {
      font-size: 18px;
      margin-bottom: 4px;
    }

    /* 数据背书 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 40px;
      text-align: center;
    }

    .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      letter-spacing: 0.3px;
      margin-top: 8px;
    }

    /* 下载引导 */
    .download-section {
      background: var(--primary);
      color: #FFFFFF;
      text-align: center;
    }

    .download-section h2 {
      color: #FFFFFF;
    }

    .download-sub {
      color: rgba(255,255,255,0.8);
      margin: 16px 0 32px;
    }

    .steps {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .step {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      background: rgba(255,255,255,0.1);
      padding: 8px 20px;
      border-radius: 20px;
    }

    /* FAQ */
    .faq-list {
      margin-top: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: var(--card-bg);
    }

    .faq-question:hover {
      background: #F5F3EE;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
      background: #F5F3EE;
      margin: 0 12px 12px;
      border-radius: 8px;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--accent);
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 32px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .footer-desc {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
    }

    .footer-links h4 {
      margin-bottom: 12px;
      font-size: 16px;
    }

    .footer-links a {
      display: block;
      color: rgba(255,255,255,0.8);
      margin-bottom: 8px;
      font-size: 14px;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: rgba(255,255,255,0.6);
    }

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

    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      .section {
        padding: var(--section-gap-mobile) 0;
      }
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-nav {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        height: calc(100vh - 64px);
        background: var(--primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        z-index: 99;
      }
      .mobile-nav.open {
        display: flex;
      }
      .mobile-nav a {
        color: #FFFFFF;
        font-size: 18px;
      }
      .hero .container {
        flex-direction: column;
      }
      .hero-image {
        min-height: 240px;
        width: 100%;
      }
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .service-block {
        flex-direction: column;
      }
      .service-image {
        min-height: 240px;
        width: 100%;
      }
      .hero-buttons .btn-primary,
      .hero-buttons .btn-secondary {
        width: 100%;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }