/* roulang page: index */
:root {
      --deep-blue: #0A1128;
      --cyan: #00F0FF;
      --amber: #FFB347;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.06);
      --text-primary: #E0E6ED;
      --text-secondary: #8892A4;
      --text-muted: #B0B8C4;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.2);
      --hover-glow: 0 12px 40px rgba(0,240,255,0.15);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, h5 {
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    
    a {
      text-decoration: none;
      color: var(--cyan);
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--cyan);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 自定义容器 */
    .custom-container {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    /* 导航栏 */
    .navbar-custom {
      background: rgba(10, 17, 40, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
      transition: var(--transition-smooth);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    
    .logo-text {
      font-weight: 700;
      font-size: 1.6rem;
      background: linear-gradient(135deg, #00F0FF 0%, #2B6EF0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.03em;
    }
    
    .nav-link-custom {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      position: relative;
      padding: 0.5rem 0.2rem;
    }
    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--cyan) !important;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 8px var(--cyan);
      transition: width 0.25s ease;
    }
    .nav-link-custom:hover::after,
    .nav-link-custom.active::after {
      width: 100%;
    }
    
    .hot-tag {
      background: rgba(0,240,255,0.1);
      border: 1px solid rgba(0,240,255,0.25);
      color: var(--cyan);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    
    .navbar-toggler {
      border: none;
      color: var(--cyan);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 240, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    /* 按钮 */
    .btn-primary-custom {
      background: linear-gradient(135deg, #00F0FF 0%, #2B6EF0 100%);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--border-radius-md);
      padding: 12px 32px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 15px rgba(0,240,255,0.25);
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.6);
      transform: translateY(-2px);
      color: white;
    }
    
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      border-radius: var(--border-radius-md);
      padding: 12px 32px;
      transition: var(--transition-smooth);
    }
    .btn-outline-cyan:hover {
      background: rgba(0,240,255,0.1);
      border-color: var(--cyan);
      color: var(--cyan);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
    }
    
    .btn-amber {
      background: var(--amber);
      border: none;
      color: #0A1128;
      font-weight: 700;
      border-radius: var(--border-radius-md);
      padding: 14px 36px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 18px rgba(255,179,71,0.3);
      animation: breathe 2.4s infinite ease-in-out;
    }
    .btn-amber:hover {
      background: #ffa726;
      box-shadow: 0 0 30px rgba(255,179,71,0.7);
      transform: scale(1.02);
      color: #0A1128;
    }
    
    @keyframes breathe {
      0% { box-shadow: 0 0 12px rgba(255,179,71,0.4); }
      50% { box-shadow: 0 0 28px rgba(255,179,71,0.8); }
      100% { box-shadow: 0 0 12px rgba(255,179,71,0.4); }
    }
    
    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      box-shadow: var(--hover-glow);
      border-color: rgba(0,240,255,0.4);
      transform: translateY(-4px);
    }
    
    /* 区块标题 */
    .section-title {
      font-weight: 600;
      font-size: 2rem;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 48px;
      height: 4px;
      background: var(--cyan);
      margin-top: 0.5rem;
      box-shadow: 0 0 12px var(--cyan);
      border-radius: 4px;
    }
    
    /* Hero */
    .hero-image-card {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      animation: float 6s infinite ease-in-out;
      border: 1px solid rgba(255,255,255,0.1);
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }
    
    /* 案例瀑布 */
    .masonry-grid {
      column-count: 2;
      column-gap: 1.5rem;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
    }
    
    /* VS 标识 */
    .vs-badge {
      width: 60px;
      height: 60px;
      background: var(--amber);
      color: #0A1128;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      box-shadow: 0 0 30px rgba(255,179,71,0.6);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(1); box-shadow: 0 0 20px rgba(255,179,71,0.5); }
      50% { transform: scale(1.08); box-shadow: 0 0 40px rgba(255,179,71,0.9); }
      100% { transform: scale(1); box-shadow: 0 0 20px rgba(255,179,71,0.5); }
    }
    
    /* FAQ */
    .accordion-button {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(8px);
      color: var(--text-primary);
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--border-radius-md) !important;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.08);
      color: var(--cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.2);
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    
    footer a {
      color: var(--text-secondary);
    }
    footer a:hover {
      color: var(--cyan);
    }
    
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
      .section-title {
        font-size: 1.6rem;
      }
      h1 {
        font-size: 2.2rem !important;
      }
      .navbar-nav {
        background: rgba(10,17,40,0.9);
        backdrop-filter: blur(25px);
        padding: 1rem;
        border-radius: 16px;
        margin-top: 0.8rem;
      }
    }