/* roulang page: index */
/* 设计变量 */
    :root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --secondary-light: #457B9D;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --dark-bg: #1A1A2E;
      --success: #2A9D8F;
      --warning: #F4A261;
      --text-main: #1D3557;
      --text-soft: #6C757D;
      --border: #DEE2E6;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-xl: 20px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Roboto", sans-serif;
      --font-mono: "JetBrains Mono", "Fira Code", monospace;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.05);
      transition: background 0.3s ease;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 2px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--secondary);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.25s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      color: white;
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: #FFF5F5;
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.03);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--secondary);
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(15px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: var(--secondary);
      text-decoration: none;
    }
    
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-md);
      min-height: 420px;
      box-shadow: var(--shadow-md);
    }
    .hero h1 {
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      color: var(--secondary);
    }
    .hero h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 32px;
    }
    
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--secondary);
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    
    /* 亮点网格 3x2 */
    .grid-highlight {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .card-icon {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .card-icon:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .card-icon i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .card-icon h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    
    /* 瀑布流案例 */
    .waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 20px;
    }
    .badge {
      background: #E9ECEF;
      color: var(--secondary-light);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }
    
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 20px;
      margin-top: 48px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-col {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      flex: 1;
      min-width: 250px;
      box-shadow: var(--shadow-sm);
    }
    .plan-col.featured {
      background: #FFF5F5;
      border-left: 4px solid var(--primary);
    }
    
    /* 数据墙 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      margin-top: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      font-family: var(--font-en);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 48px auto 0;
    }
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border);
      padding: 20px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8F9FA;
      padding: 0 20px;
    }
    
    /* CTA */
    .cta-block {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 0;
    }
    
    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #ADB5BD;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    
    @media (max-width: 1024px) {
      .grid-highlight { grid-template-columns: repeat(2,1fr); }
      .waterfall { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero { flex-direction: column; }
      .hero-right { min-height: 300px; width: 100%; }
      .grid-highlight, .waterfall { grid-template-columns: 1fr; }
      .compare-table { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }