/* roulang page: index */
:root {
      --deep-midnight: #0A0E27;
      --neon-pink: #FF3CAC;
      --electric-cyan: #00F0FF;
      --light-bg: #F5F6FA;
      --body-text: #1A1A2E;
      --white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: #E0E0E8;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --neon-glow-cyan: 0 0 20px rgba(0,240,255,0.3);
      --neon-glow-pink: 0 8px 24px rgba(255,60,172,0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      color: var(--body-text);
      background-color: var(--light-bg);
      line-height: 1.75;
      font-size: 16px;
      margin: 0;
      padding-top: 72px; /* sticky nav height */
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    
    h1 {
      font-size: 48px;
      font-weight: 800;
      letter-spacing: -1px;
      line-height: 1.2;
    }
    
    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    
    .text-small {
      font-size: 14px;
      font-weight: 500;
    }
    
    .section-padding {
      padding: 5rem 0;
    }
    
    .bg-deep {
      background-color: var(--deep-midnight);
    }
    
    .bg-light {
      background-color: var(--light-bg);
    }
    
    .text-neon {
      color: var(--electric-cyan);
    }
    
    .text-pink {
      color: var(--neon-pink);
    }
    
    /* 导航 */
    .navbar {
      background-color: var(--deep-midnight);
      height: 72px;
      border-bottom: 2px solid transparent;
      background-image: linear-gradient(var(--deep-midnight), var(--deep-midnight)), linear-gradient(90deg, var(--neon-pink), var(--electric-cyan));
      background-origin: border-box;
      background-clip: padding-box, border-box;
      box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    
    .navbar-brand {
      font-size: 24px;
      font-weight: 800;
      color: var(--electric-cyan) !important;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .navbar-brand i {
      font-size: 28px;
      color: var(--neon-pink);
    }
    
    .navbar-nav .nav-link {
      color: #CCCCDD !important;
      font-size: 15px;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: var(--transition-smooth);
      position: relative;
      padding: 0.5rem 0.75rem;
    }
    
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--electric-cyan) !important;
    }
    
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0.75rem;
      right: 0.75rem;
      height: 2px;
      background-color: var(--neon-pink);
      box-shadow: 0 0 8px var(--neon-pink);
    }
    
    .btn-primary-custom {
      background: linear-gradient(90deg, #FF3CAC, #FF6B6B);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(255,60,172,0.3);
      letter-spacing: 0.3px;
    }
    
    .btn-primary-custom:hover {
      background: linear-gradient(90deg, #FF6B6B, #FF3CAC);
      box-shadow: var(--neon-glow-pink);
      transform: translateY(-2px);
      color: white;
    }
    
    .btn-outline-neon {
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    
    .btn-outline-neon:hover {
      background: var(--electric-cyan);
      color: var(--deep-midnight);
      box-shadow: var(--neon-glow-cyan);
    }
    
    .btn-ghost-white {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      font-weight: 600;
    }
    
    .btn-ghost-white:hover {
      background: white;
      color: var(--deep-midnight);
    }
    
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #0A0E27 0%, #1B1B3A 50%, #0A0E27 100%);
      min-height: calc(100vh - 72px);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    
    .hero-section::before {
      content: "";
      position: absolute;
      top: -20%;
      left: 10%;
      width: 60%;
      height: 140%;
      background: radial-gradient(circle at 30% 50%, rgba(255,60,172,0.15), transparent 70%);
      pointer-events: none;
    }
    
    .hero-image-container {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(0,240,255,0.2);
    }
    
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--electric-cyan);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-4px); }
    }
    
    /* 卡片通用 */
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
      height: 100%;
    }
    
    .card-custom:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover), var(--neon-glow-cyan);
      border-color: rgba(0,240,255,0.25);
    }
    
    .card-cover-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }
    
    .card-overlay-title {
      position: relative;
    }
    
    .card-overlay-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 50%;
      background: linear-gradient(transparent, rgba(10,14,39,0.7));
      border-radius: 0 0 var(--radius-card) var(--radius-card);
    }
    
    .badge-neon {
      border: 1px solid var(--electric-cyan);
      color: var(--electric-cyan);
      background: transparent;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
      letter-spacing: 0.3px;
    }
    
    /* 优势图标 */
    .icon-circle {
      width: 64px;
      height: 64px;
      border: 2px dashed var(--neon-pink);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--neon-pink);
      transition: var(--transition-smooth);
      margin-bottom: 1.5rem;
    }
    
    .icon-circle.cyan {
      border-color: var(--electric-cyan);
      color: var(--electric-cyan);
    }
    
    .icon-circle:hover {
      background: var(--neon-pink);
      color: white;
      border-style: solid;
    }
    
    .icon-circle.cyan:hover {
      background: var(--electric-cyan);
      color: var(--deep-midnight);
    }
    
    /* 数据块 */
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--electric-cyan);
      font-family: 'Inter', sans-serif;
    }
    
    /* 案例网格 */
    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      aspect-ratio: 16 / 10;
      background-size: cover;
      background-position: center;
      position: relative;
      transition: var(--transition-smooth);
    }
    
    .case-card .overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,14,39,0.75);
      opacity: 0;
      transition: 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      color: white;
    }
    
    .case-card:hover .overlay {
      opacity: 1;
    }
    
    .case-link {
      color: white;
      border-bottom: 2px solid var(--neon-pink);
      font-weight: 600;
      text-decoration: none;
    }
    
    /* 流程 */
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--neon-pink);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 1rem;
    }
    
    .step-line {
      border-left: 2px dashed var(--electric-cyan);
      height: 40px;
      margin: 0 auto;
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--deep-midnight);
      box-shadow: none;
      border-left: 4px solid var(--electric-cyan);
    }
    
    .accordion-button {
      font-weight: 600;
      font-size: 18px;
      border-left: 4px solid var(--neon-pink);
      background: white;
    }
    
    .accordion-item {
      border: none;
      margin-bottom: 1rem;
    }
    
    /* 表单 */
    .form-control {
      border-radius: var(--radius-input);
      border: 1px solid var(--border-light);
      padding: 0.75rem 1rem;
    }
    
    .form-control:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 0 0.2rem rgba(0,240,255,0.25);
    }
    
    /* 页脚 */
    .footer {
      background: var(--deep-midnight);
      border-top: 2px solid var(--neon-pink);
    }
    
    .social-icon {
      width: 40px;
      height: 40px;
      border: 1px solid #555;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #ccc;
      transition: var(--transition-smooth);
      margin: 0 4px;
    }
    
    .social-icon:hover {
      background: var(--electric-cyan);
      color: var(--deep-midnight);
      border-color: var(--electric-cyan);
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .navbar-collapse { background: var(--deep-midnight); padding: 1rem; }
    }