/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #E43D2A;
      --primary-dark: #c5301f;
      --secondary: #1A1F36;
      --accent: #F5A623;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --text-main: #1A1F36;
      --text-secondary: #5B6778;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(26, 31, 54, 0.06);
      --shadow-hover: 0 12px 32px rgba(228, 61, 42, 0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-badge: 20px;
      --transition: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --nav-height: 64px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.3px;
      color: var(--secondary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--text-secondary);
      font-size: 0.95rem;
      transition: var(--transition);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 8px 18px !important;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      border-bottom: none !important;
    }
    .btn-nav:hover {
      background: #c5301f;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(228,61,42,0.4);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--secondary);
      cursor: pointer;
    }
    
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      letter-spacing: -0.3px;
      color: var(--secondary);
      text-align: center;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    
    /* 按钮体系 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 6px 18px rgba(228,61,42,0.25);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(228,61,42,0.08);
      border-color: #c5301f;
      color: #c5301f;
    }
    
    /* Hero */
    #hero {
      background: radial-gradient(circle at 85% 20%, rgba(228,61,42,0.12) 0%, transparent 55%);
      padding: 60px 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-width: 100%;
      height: auto;
      border-radius: 32px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
      color: var(--secondary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 2rem;
    }
    .highlight-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .highlight-card h3 {
      font-size: 1.3rem;
      margin-bottom: 0.7rem;
    }
    .badge-data {
      background: var(--accent);
      color: white;
      display: inline-block;
      padding: 4px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
      margin-top: 1rem;
    }
    
    /* 案例瀑布 */
    .cases-flow {
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    .case-row {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }
    .case-img img {
      width: 100%;
      display: block;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .case-text {
      flex: 1;
    }
    .case-text h3 {
      font-size: 1.6rem;
      margin-bottom: 0.8rem;
    }
    .tag {
      background: rgba(228,61,42,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    
    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: white;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .compare-col {
      padding: 32px 24px;
      text-align: center;
      border-right: 1px solid #f0f0f0;
    }
    .compare-col:last-child {
      border-right: none;
    }
    .compare-col.featured {
      background: rgba(228,61,42,0.03);
      border: 2px solid var(--primary);
      border-radius: 18px;
      margin: -8px;
      position: relative;
      z-index: 2;
    }
    .compare-col h3 {
      font-size: 1.3rem;
      margin-bottom: 1rem;
    }
    
    /* 数据荣誉墙 */
    .badges-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      text-align: center;
    }
    .stat-item {
      flex: 1;
      min-width: 140px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-q {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    
    /* 最终CTA */
    .dark-cta {
      background: var(--secondary);
      border-radius: 32px;
      padding: 70px 30px;
      text-align: center;
      color: white;
    }
    
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .grid-3, .compare-table { grid-template-columns: 1fr; }
      .case-row, .case-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2rem; }
    }