/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --primary-glow: rgba(0, 230, 118, 0.5);
      --secondary-bg: #1A1A1A;
      --deep-bg: #121212;
      --accent-orange: #FF6D00;
      --accent-gold: #FFAB00;
      --text-light: #F5F5F7;
      --text-muted: #A0A0B0;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 8px 30px rgba(0,230,118,0.25);
      --border-light: rgba(255,255,255,0.08);
      --border-focus: rgba(0,230,118,0.6);
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--secondary-bg);
      color: #F5F5F7;
      line-height: 1.7;
      letter-spacing: 0.02em;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-family: 'Inter', 'SF Pro Display', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      letter-spacing: -0.02em;
    }
    .mono {
      font-family: 'JetBrains Mono', 'SF Mono', 'Courier New', monospace;
      font-weight: 700;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(18, 18, 18, 0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-search {
      border-radius: 30px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.12);
      transition: var(--transition);
      color: white;
      padding: 8px 16px 8px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-search input {
      background: transparent;
      border: none;
      outline: none;
      color: white;
      font-size: 0.95rem;
      width: 100%;
    }
    .nav-search input::placeholder {
      color: #aaa;
      font-weight: 400;
    }
    .nav-search:focus-within {
      border-color: var(--primary);
      background: rgba(255,255,255,0.12);
      box-shadow: 0 0 0 3px rgba(0,230,118,0.3);
    }
    .nav-link {
      color: #ddd;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .hamburger-menu {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger-menu span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    /* 卡片通用 */
    .card {
      background: var(--secondary-bg);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(0,230,118,0.35);
    }
    .light-card {
      background: #F5F5F7;
      color: #1A1A1A;
      border: 1px solid rgba(0,0,0,0.06);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }
    .light-card:hover {
      border-color: rgba(0,230,118,0.5);
      box-shadow: 0 8px 25px rgba(0,230,118,0.2);
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E676, #00C853);
      color: #1A1A1A;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 0 22px rgba(0,230,118,0.65);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
      box-shadow: 0 0 15px rgba(0,230,118,0.4);
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 64px 0;
      }
      .hamburger-menu {
        display: flex;
      }
      .nav-links-desktop {
        display: none;
      }
      .mobile-menu {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(18,18,18,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        display: none;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .mobile-menu.active {
        display: flex;
      }
      .nav-search {
        width: 100%;
      }
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: inline-block;
      animation: pulse 1.4s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.2); }
      100% { opacity: 1; transform: scale(1); }
    }
    .count-up {
      transition: all 0.8s ease-out;
    }