/* roulang page: index */
:root {
      --primary: #E8452D;
      --primary-deep: #C63A25;
      --primary-soft: rgba(232, 69, 45, 0.08);
      --accent-gold: #F5B642;
      --accent-gold-soft: rgba(245, 182, 66, 0.2);
      --dark: #1A1D22;
      --gray-deep: #2C2F33;
      --gray-mid: #6B7280;
      --gray-light: #F0EFEC;
      --bg-warm: #F9F8F6;
      --white: #FFFFFF;
      --success: #10B981;
      --border-light: rgba(0, 0, 0, 0.04);
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-warm);
      color: var(--gray-deep);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #main-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: box-shadow var(--transition);
    }
    #main-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--dark);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary) 0%, #c0392b 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 1.2rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--gray-deep);
      transition: color var(--transition);
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 6px 16px rgba(232,69,45,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark);
      border-radius: 2px;
      transition: var(--transition);
    }
    /* 移动端菜单 */
    @media (max-width: 1024px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 80px 32px;
        gap: 28px;
        box-shadow: -8px 0 24px rgba(0,0,0,0.08);
        transition: right 0.3s ease;
        z-index: 100;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 110;
      }
    }
    /* Hero */
    #hero {
      padding: 70px 0 80px;
      background: var(--bg-warm);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--dark);
      margin-bottom: 20px;
    }
    .hero-highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: var(--gray-mid);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 400px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(232,69,45,0.1) 0%, transparent 60%);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.3rem;
      }
      .hero-image {
        height: 280px;
      }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--gray-mid);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }
    /* 亮点网格 */
    #highlights {
      background: white;
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--bg-warm);
      padding: 28px 20px;
      border-radius: var(--radius-lg);
      transition: var(--transition);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .highlight-icon {
      font-size: 2rem;
      color: var(--primary);
    }
    .highlight-text h3 {
      font-size: 1.2rem;
      margin-bottom: 6px;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务瀑布流 */
    #services {
      background: var(--bg-warm);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s ease;
    }
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    .service-body {
      padding: 24px;
      flex: 1;
    }
    .tag {
      background: var(--accent-gold-soft);
      color: #b45309;
      font-size: 0.7rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 50px;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* 对比表 */
    #comparison {
      background: white;
    }
    .comparison-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .plan-card.recommended {
      border-top: 4px solid var(--primary);
      box-shadow: var(--shadow-card);
    }
    .plan-badge {
      background: var(--primary);
      color: white;
      font-size: 0.75rem;
      padding: 4px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .feature-list {
      list-style: none;
      margin: 24px 0;
    }
    .feature-list li {
      padding: 10px 0;
      border-bottom: 1px solid rgba(0,0,0,0.03);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    @media (max-width: 768px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据条 */
    #trust {
      background: var(--dark);
      color: white;
    }
    .trust-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .trust-item {
      padding: 20px;
    }
    .trust-number {
      font-family: var(--font-number);
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .faq-question {
      width: 100%;
      background: none;
      font-weight: 600;
      font-size: 1.1rem;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--gray-mid);
    }
    .faq-item.active .faq-answer {
      max-height: 180px;
      padding-bottom: 16px;
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #1A1D22 0%, #2d2f34 100%);
      text-align: center;
    }
    .cta-title {
      color: white;
      font-size: 2.4rem;
    }
    /* 页脚 */
    #footer {
      background: #1A1D22;
      color: #bbb;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }