/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --accent: #FF6D00;
      --bg-deep: #0A0E27;
      --bg-dark: #060A1A;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --glass-hover: rgba(255, 255, 255, 0.08);
      --text-white: #FFFFFF;
      --text-gray: #E0E0E0;
      --text-muted: #9E9E9E;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-xl: 30px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      padding: 16px 0;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .header-nav.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,230,118,0.3);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-text {
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.3px;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bg-deep);
      font-weight: 700;
    }
    .desktop-nav a {
      margin: 0 16px;
      color: #ddd;
      font-weight: 500;
      font-size: 0.95rem;
    }
    .desktop-nav a:hover {
      color: var(--primary);
    }
    .btn-primary-sm {
      background: var(--primary);
      color: var(--bg-deep);
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 0 15px rgba(0,230,118,0.5);
      transition: var(--transition);
      display: inline-block;
    }
    .btn-primary-sm:hover {
      background: #00FF80;
      box-shadow: 0 0 25px rgba(0,230,118,0.7);
      transform: scale(1.03);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }
    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .header-nav.mobile-open {
        background: rgba(10,14,39,0.95);
      }
    }
    .mobile-menu {
      display: none;
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(25px);
      padding: 24px;
      flex-direction: column;
      gap: 24px;
      font-size: 1.25rem;
    }
    .mobile-menu.active {
      display: flex;
    }
    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      background: var(--glass-hover);
      border-color: rgba(255,255,255,0.2);
      transform: translateY(-4px);
    }
    /* 发光按钮 */
    .btn-glow {
      background: var(--primary);
      color: var(--bg-deep);
      font-weight: 700;
      border-radius: 30px;
      padding: 14px 36px;
      font-size: 1.1rem;
      box-shadow: 0 0 20px rgba(0,230,118,0.5), 0 0 40px rgba(0,230,118,0.2);
      transition: var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-glow:hover {
      background: #00FF80;
      box-shadow: 0 0 30px rgba(0,230,118,0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: 30px;
      padding: 14px 36px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
      border-color: #00FF80;
      color: #00FF80;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
    }
    .accent-tag {
      background: var(--accent);
      color: white;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      letter-spacing: 0.5px;
    }
    .floating-card {
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }