/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --accent: #FF5E14;
      --neon-green: #00E676;
      --bg-dark: #0B0E14;
      --bg-secondary: #141C2B;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.08);
      --text-white: #FFFFFF;
      --text-gray: #B0B8C5;
      --text-muted: #6B7385;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow-blue: 0 0 20px rgba(10,110,255,0.5), 0 0 40px rgba(10,110,255,0.2);
      --shadow-glow-orange: 0 0 24px rgba(255,94,20,0.6);
      --transition: 0.3s ease;
      --container-max: 1280px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 背景网格图案 */
    .bg-grid {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    a {
      text-decoration: none;
      color: var(--primary);
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }

    .header.scrolled {
      background: rgba(11, 14, 20, 0.95);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-white);
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #fff 0%, #a0c0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--text-gray);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      box-shadow: 0 0 8px var(--primary);
    }

    .btn-nav {
      background: var(--accent);
      color: #fff !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: var(--shadow-glow-orange);
      transition: var(--transition);
      font-size: 14px;
    }

    .btn-nav:hover {
      background: #ff7a3a;
      transform: scale(1.05);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
    }

    .menu-toggle span {
      width: 25px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-white);
      text-align: center;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 60px;
      font-size: 16px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px) saturate(120%);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .glass-card:hover {
      border-color: rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.06);
      box-shadow: 0 12px 40px rgba(10,110,255,0.15);
      transform: translateY(-4px);
    }

    .btn {
      display: inline-block;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      border: none;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: var(--shadow-glow-blue);
      animation: pulse 2s infinite;
    }

    .btn-primary:hover {
      background: #1E7FFF;
      transform: scale(1.05);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
    }

    .btn-outline:hover {
      border-color: #fff;
      background: rgba(255,255,255,0.05);
      transform: scale(1.05);
    }

    .btn-accent {
      background: var(--accent);
      color: #fff;
      box-shadow: var(--shadow-glow-orange);
      font-size: 18px;
      padding: 16px 40px;
    }

    .btn-accent:hover {
      background: #ff7a3a;
      transform: scale(1.05);
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 20px rgba(10,110,255,0.5), 0 0 40px rgba(10,110,255,0.2); }
      50% { box-shadow: 0 0 28px rgba(10,110,255,0.7), 0 0 52px rgba(10,110,255,0.3); }
      100% { box-shadow: 0 0 20px rgba(10,110,255,0.5), 0 0 40px rgba(10,110,255,0.2); }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 90vh;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: var(--text-gray);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }

    .hero-stats {
      color: var(--neon-green);
      font-weight: 600;
    }

    .hero-image {
      flex: 0.8;
      position: relative;
    }

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }

    .data-panel {
      position: absolute;
      bottom: -20px;
      right: -20px;
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      padding: 16px 20px;
      border-radius: 12px;
      border: 1px solid var(--card-border);
      color: #fff;
    }

    /* 特性网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      padding: 32px;
      text-align: center;
    }

    .feature-icon {
      font-size: 36px;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .feature-card h3 {
      font-size: 22px;
      color: #fff;
      margin-bottom: 12px;
    }

    /* 产品杂志布局 */
    .products-layout {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .product-main {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius-card);
    }

    .product-main img {
      width: 100%;
      height: 350px;
      object-fit: cover;
    }

    .product-info {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      color: #fff;
    }

    .product-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .product-item {
      display: flex;
      gap: 16px;
      align-items: center;
    }

    .product-item img {
      width: 100px;
      height: 70px;
      object-fit: cover;
      border-radius: 8px;
    }

    .tag {
      background: var(--accent);
      color: #fff;
      padding: 2px 10px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }

    /* 统计 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 32px;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--neon-green);
      margin-bottom: 8px;
    }

    /* 步骤 */
    .steps {
      display: flex;
      justify-content: center;
      gap: 48px;
      align-items: center;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-circle {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      color: #fff;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      color: #fff;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: rgba(255,255,255,0.02);
      padding: 0 16px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(10,110,255,0.08) 0%, transparent 70%);
      text-align: center;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .products-layout { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .steps { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
    }