/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --secondary-dark: #1E1E2F;
      --accent-yellow: #FFB300;
      --bg-light: #F5F6FA;
      --bg-dark: #0F0F1A;
      --text-main: #1A1A2E;
      --text-muted: #5A5A72;
      --text-white: #FFFFFF;
      --success: #00C853;
      --alert: #FF1744;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Monaco', 'Consolas', monospace;
      --max-width: 1200px;
      --header-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      border: none;
      outline: none;
      font-family: inherit;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      align-items: center;
    }
    
    .header.scrolled {
      background: rgba(15, 15, 26, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -0.3px;
    }
    
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
      filter: drop-shadow(0 2px 4px rgba(229,57,53,0.4));
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-yellow);
    }
    
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-yellow);
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
      z-index: 1001;
    }
    
    .hamburger span {
      width: 24px;
      height: 2px;
      background: #FFFFFF;
      border-radius: 2px;
      transition: 0.3s;
    }
    
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(15,15,26,0.98);
      backdrop-filter: blur(16px);
      z-index: 999;
      padding: 100px 24px 40px;
      flex-direction: column;
      gap: 2rem;
    }
    
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: #FFFFFF;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      padding-bottom: 0.5rem;
    }
    
    /* 英雄区 */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: radial-gradient(circle at 20% 30%, #1E1E2F 0%, #0F0F1A 90%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    
    .hero-bg-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0.25;
      pointer-events: none;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
      color: #FFFFFF;
    }
    
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
    }
    
    .hero-sub {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 2.5rem;
    }
    
    .btn-group {
      display: flex;
      gap: 1.2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.2s ease;
      text-align: center;
    }
    
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
    }
    
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    
    .btn-outline {
      border: 2px solid #FFFFFF;
      color: #FFFFFF;
    }
    
    .btn-outline:hover {
      background: #FFFFFF;
      color: var(--secondary-dark);
    }
    
    .btn-accent {
      background: var(--accent-yellow);
      color: var(--secondary-dark);
      font-weight: 700;
    }
    
    .btn-accent:hover {
      background: #FFA000;
    }
    
    .floating-score-card {
      position: absolute;
      right: 8%;
      bottom: 15%;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 16px 20px;
      border: 1px solid rgba(255,255,255,0.2);
      color: #FFFFFF;
      font-family: var(--font-mono);
      z-index: 2;
    }
    
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
      color: var(--text-main);
    }
    
    .section-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 3rem;
    }
    
    /* 功能非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .feature-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
      position: relative;
      border-top: 4px solid var(--primary);
    }
    
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    
    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    
    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    
    .feature-card p {
      color: var(--text-muted);
    }
    
    /* 场景交替 */
    .scenario-row {
      display: flex;
      gap: 40px;
      margin-bottom: 60px;
      align-items: center;
    }
    
    .scenario-img {
      flex: 1;
      background: #e9ebf0;
      border-radius: var(--radius-lg);
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    
    .scenario-text {
      flex: 1;
    }
    
    /* 数据区 */
    .stats-bg {
      background: var(--bg-dark);
      color: #FFFFFF;
    }
    
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-yellow);
      font-family: var(--font-mono);
    }
    
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .price-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: 0.2s;
    }
    
    .price-card.featured {
      transform: scale(1.04);
      box-shadow: var(--shadow-md);
      border-top: 6px solid var(--primary);
    }
    
    .price-amount {
      font-size: 2.5rem;
      font-weight: 800;
      font-family: var(--font-mono);
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    
    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .hero h1 { font-size: 40px; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid, .pricing-grid, .stats-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 32px; }
      section { padding: 60px 0; }
    }