/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #134B61;
      --accent: #FF6B35;
      --accent-dark: #E55A2B;
      --bg: #FAFBFB;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-soft: #475569;
      --text-light: #64748B;
      --border-light: #E2E8F0;
      --bg-light: #F1F5F9;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 2px 8px rgba(26,95,122,0.12), 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "SF Pro Display", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
      transition: var(--transition);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-soft);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary);
    }
    @media (max-width: 640px) {
      .site-header {
        height: 60px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: var(--shadow-sm);
        border-top: 1px solid var(--border-light);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #FAFBFB 0%, #E8F4F8 100%);
      padding: 140px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(255,107,53,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,107,53,0.4);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      box-shadow: var(--shadow-hover);
      animation: float 4s ease-in-out infinite;
      position: relative;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0px); }
    }
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
      }
      .hero-text h1 {
        font-size: 40px;
      }
      .hero-image {
        width: 100%;
        min-height: 300px;
      }
    }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 12px;
    }
    .section-title p {
      font-size: 18px;
      color: var(--text-soft);
      max-width: 600px;
      margin: 0 auto;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .advantage-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .advantage-icon {
      background: var(--primary);
      width: 64px;
      height: 64px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 28px;
      color: white;
    }
    .advantage-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 功能分组交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .feature-img img {
      width: 100%;
      height: auto;
    }
    .feature-content {
      flex: 1;
    }
    .feature-content h3 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .feature-list {
      list-style: none;
      padding: 0;
    }
    .feature-list li {
      padding-left: 24px;
      position: relative;
      margin-bottom: 12px;
    }
    .feature-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      position: absolute;
      left: 0;
      top: 10px;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }
    /* 场景卡片 */
    .scenes-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scene-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      background-size: cover;
      background-position: center;
      min-height: 320px;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 24px;
      color: white;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .scene-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.1) 60%);
      transition: var(--transition);
    }
    .scene-card:hover {
      transform: scale(1.02);
    }
    .scene-card h3, .scene-card p {
      position: relative;
      z-index: 2;
    }
    .scene-card h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    /* 数据墙 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-item {
      padding: 32px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-soft);
      margin-top: 8px;
    }
    /* FAQ */
    .accordion-title {
      font-size: 16px;
      font-weight: 500;
      color: var(--primary);
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      padding: 16px 20px;
      margin-bottom: 8px;
    }
    .accordion-title::before {
      color: var(--accent);
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
      padding: 80px 20px;
      color: white;
    }
    .cta-section h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .cta-section .btn-primary {
      background: var(--accent);
      margin-top: 24px;
    }
    /* 页脚 */
    .site-footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 20px 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      max-width: 1200px;
      margin: 0 auto;
    }
    .footer-links a {
      display: block;
      color: #CBD5E1;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .copyright {
      text-align: center;
      padding-top: 40px;
      color: #94A3B8;
    }
    @media (max-width: 768px) {
      .advantages-grid, .scenes-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }