/* roulang page: index */
:root {
      --primary: #FF5C00;
      --primary-hover: #E04E00;
      --secondary: #1A1D22;
      --accent-white: #F0F0F0;
      --gold: #D4A843;
      --bg-light: #FAFAFA;
      --text-dark: #1A1D22;
      --text-muted: #5A5D62;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --radius: 12px;
      --radius-btn: 8px;
      --transition: 0.2s ease;
      --font-mono: 'Roboto Mono', 'Courier New', monospace;
      --sans: 'MiSans', 'PingFang SC', 'Source Han Sans CN', 'Noto Sans SC', sans-serif;
      --container-max: 1280px;
      --gap-col: 24px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 80px; /* 为移动端底部导航留出空间 */
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    button, input {
      font-family: inherit;
      border: none;
      outline: none;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 桌面导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
      z-index: 1000;
      display: none;
    }
    
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--secondary);
    }
    .logo span {
      color: var(--primary);
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-dark);
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(26, 29, 34, 0.88);
      backdrop-filter: blur(20px);
      display: flex;
      justify-content: space-around;
      align-items: center;
      height: 64px;
      z-index: 1000;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--accent-white);
      opacity: 0.7;
      font-size: 0.7rem;
      transition: opacity var(--transition), color var(--transition);
    }
    
    .mobile-tab i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }
    
    .mobile-tab.active {
      color: var(--primary);
      opacity: 1;
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1D22 0%, #0B0C0E 100%);
      color: white;
      padding: 140px 0 80px;
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }
    
    .hero-left {
      flex: 1;
    }
    
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }
    
    .hero-left .subtitle {
      font-size: 1.2rem;
      color: var(--accent-white);
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: background var(--transition), transform var(--transition);
      cursor: pointer;
      border: none;
    }
    
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
    }
    
    .hero-right {
      flex: 0 0 380px;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(12px);
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid rgba(255,255,255,0.08);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    
    .stat-card {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .stat-label {
      font-size: 0.9rem;
      color: var(--accent-white);
      opacity: 0.8;
    }
    
    .stat-value {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 5px;
    }
    
    .pulse-dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
      margin-left: 6px;
      box-shadow: 0 0 8px var(--primary);
      animation: pulse 1.5s infinite;
    }
    
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.6; transform: scale(1.2); }
      100% { opacity: 1; transform: scale(1); }
    }
    
    .bg-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(255,92,0,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      line-height: 1.3;
    }
    
    .section-desc {
      color: var(--text-muted);
      margin-bottom: 2.5rem;
    }
    
    /* 数据指标看板 */
    .data-dashboard {
      background: var(--secondary);
      color: white;
      padding: 70px 0;
    }
    
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .metric-item {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(5px);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid rgba(255,255,255,0.08);
    }
    
    .metric-label {
      font-size: 0.9rem;
      color: var(--accent-white);
      opacity: 0.8;
    }
    
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 600;
      color: var(--primary);
      margin: 8px 0;
    }
    
    /* 服务矩阵 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
      border: 1px solid transparent;
    }
    
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    
    .service-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 1.25rem;
      transition: transform 0.2s;
    }
    
    .service-card:hover .service-icon {
      transform: rotate(3deg);
    }
    
    .service-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    
    .data-tag {
      display: inline-block;
      background: var(--accent-white);
      color: var(--secondary);
      font-weight: 600;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      margin-top: 1rem;
    }
    
    /* 对比区块 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
      background: white;
      border-radius: var(--radius);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }
    
    .compare-col {
      flex: 1;
    }
    
    .compare-col h3 {
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }
    
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }
    
    .vs-badge {
      font-weight: 700;
      color: var(--gold);
      border: 2px solid var(--gold);
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
    }
    
    .highlight {
      color: var(--primary);
      font-weight: 700;
    }
    
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    
    .step-item {
      flex: 1;
      position: relative;
    }
    
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 1rem;
    }
    
    /* FAQ */
    .faq-group {
      margin-top: 2rem;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 24px 18px;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open {
      border-left: 4px solid var(--primary);
    }
    
    /* CTA */
    .cta-section {
      background: var(--secondary);
      color: white;
    }
    
    .input-group {
      display: flex;
      max-width: 480px;
      margin: 1.5rem 0;
    }
    .input-group input {
      flex: 1;
      padding: 12px 16px;
      border-radius: var(--radius-btn) 0 0 var(--radius-btn);
    }
    
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: var(--accent-white);
      padding: 40px 0 20px;
    }
    
    @media (min-width: 768px) {
      .desktop-nav {
        display: block;
      }
      .mobile-bottom-nav {
        display: none;
      }
      body {
        padding-bottom: 0;
      }
    }
    
    @media (max-width: 767px) {
      .hero .container {
        flex-direction: column;
      }
      .hero-right {
        width: 100%;
      }
      .metrics-grid,
      .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrapper {
        flex-direction: column;
      }
      .steps {
        flex-wrap: wrap;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }