/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --deep-charcoal: #1C1C1E;
      --electric-purple: #7B2FF7;
      --electric-purple-hover: #6928E0;
      --competition-gold: #D4AF37;
      --cold-white: #F8F9FC;
      --light-gray-bg: #F0F2F5;
      --white: #FFFFFF;
      --text-primary: #1C1C1E;
      --text-secondary: #5A5A5E;
      --text-muted: #8E8E93;
      --border-light: #E5E5EA;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --transition-smooth: 0.25s ease-out;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1280px;
      --nav-height: 64px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--cold-white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input, select {
      font-family: inherit;
      font-size: inherit;
      outline: none;
      border: none;
      background: none;
    }
    
    /* 通用排版 */
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }
    
    h1 {
      font-size: 52px;
      letter-spacing: -0.5px;
      color: var(--deep-charcoal);
    }
    
    h2 {
      font-size: 34px;
      font-weight: 600;
      color: var(--deep-charcoal);
      margin-bottom: 12px;
    }
    
    .section-subtitle {
      font-size: 17px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 680px;
    }
    
    /* 紫色强调文字 */
    .highlight {
      color: var(--electric-purple);
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.2s ease;
      white-space: nowrap;
      border: 1.5px solid transparent;
    }
    
    .btn-primary {
      background-color: var(--electric-purple);
      color: white;
      border-color: var(--electric-purple);
    }
    
    .btn-primary:hover {
      background-color: var(--electric-purple-hover);
      transform: scale(1.03);
      box-shadow: 0 6px 18px rgba(123, 47, 247, 0.35);
    }
    
    .btn-outline-gold {
      border-color: var(--competition-gold);
      color: var(--competition-gold);
      background: transparent;
    }
    
    .btn-outline-gold:hover {
      background-color: var(--competition-gold);
      color: var(--deep-charcoal);
      transform: scale(1.03);
    }
    
    .btn-gold-highlight {
      background-color: var(--competition-gold);
      color: var(--deep-charcoal);
      border-color: var(--competition-gold);
      font-weight: 700;
    }
    
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      padding: 28px;
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    
    .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: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FF7 0%, #A55AFF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 4px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-purple);
      transition: width 0.2s ease;
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      border-top: 1px solid var(--border-light);
      padding: 8px 20px;
      justify-content: space-around;
      z-index: 99;
    }
    
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      transition: color 0.2s;
    }
    
    .mobile-nav a i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(90deg, #1C1C1E 0%, rgba(28,28,30,0.75) 60%, rgba(28,28,30,0.2) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 580px;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    
    .hero-content {
      max-width: 650px;
    }
    
    .hero h1 {
      color: white;
      animation: fadeUp 0.8s ease;
    }
    
    .hero .hero-sub {
      font-size: 20px;
      margin: 20px 0 32px;
      opacity: 0.9;
      line-height: 1.6;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(24px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: -40px;
      position: relative;
      z-index: 3;
    }
    
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      color: var(--electric-purple);
      margin: 8px 0;
    }
    
    .trend-line {
      width: 100%;
      height: 40px;
      margin-top: 12px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20" fill="none"><path d="M0 15 L20 10 L40 14 L60 5 L80 8 L100 2" stroke="%237B2FF7" stroke-width="2" fill="none"/></svg>') no-repeat center;
      background-size: cover;
    }
    
    /* 服务矩阵 2x3 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }
    
    .service-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border-left: 4px solid transparent;
    }
    
    .service-card:nth-child(odd) {
      border-left-color: var(--electric-purple);
    }
    
    .service-card:nth-child(even) {
      border-left-color: var(--competition-gold);
    }
    
    .service-card i {
      font-size: 28px;
      color: var(--electric-purple);
      margin-bottom: 16px;
    }
    
    /* 对比表 */
    .compare-table {
      display: flex;
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    
    .compare-col {
      flex: 1;
      padding: 28px;
    }
    
    .compare-col.strategy {
      background: #FAFAFC;
      border-right: 1px solid var(--border-light);
    }
    
    .compare-col.kaiyun {
      background: white;
    }
    
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #f0f0f0;
    }
    
    .check-gold {
      color: var(--competition-gold);
      font-weight: bold;
    }
    
    .cross-gray {
      color: #ccc;
    }
    
    /* 案例卡片 */
    .cases-scroll {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .case-card img {
      border-radius: 8px;
      height: 140px;
      object-fit: cover;
      width: 100%;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      padding-left: 12px;
      border-left: 3px solid var(--competition-gold);
      transition: border-color 0.2s;
    }
    
    .faq-item.active .faq-question {
      border-left-color: var(--electric-purple);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 24px;
      color: var(--text-secondary);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    
    /* CTA 表单 */
    .cta-section {
      background: var(--deep-charcoal);
      padding: 70px 0;
    }
    
    .cta-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 40px;
      max-width: 600px;
      margin: 0 auto;
    }
    
    .input-group {
      margin-bottom: 20px;
    }
    
    .input-group input, .input-group select {
      width: 100%;
      padding: 12px 0;
      border-bottom: 2px solid #ddd;
      font-size: 16px;
      transition: border-color 0.2s;
    }
    
    .input-group input:focus, .input-group select:focus {
      border-bottom-color: var(--electric-purple);
    }
    
    .footer {
      background: var(--deep-charcoal);
      color: #ccc;
      padding: 48px 0 24px;
      border-top: 2px solid var(--competition-gold);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
    }
    
    @media (max-width: 1024px) {
      .services-grid, .cases-scroll {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      h1 { font-size: 36px; }
      h2 { font-size: 26px; }
      .dashboard-grid, .services-grid, .cases-scroll {
        grid-template-columns: 1fr;
      }
      .hero {
        min-height: 450px;
      }
      .compare-table {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .card:hover {
        transform: none;
      }
    }