/* roulang page: index */
:root {
      --primary-neon: #00F0A8;
      --secondary-deep-purple: #2D00F7;
      --bg-deep-black: #0A0A0F;
      --bg-dark-card: #14141F;
      --text-primary: #E8E8EC;
      --text-secondary: #8A8A9A;
      --border-glow: rgba(0, 240, 168, 0.15);
      --border-card: rgba(0, 240, 168, 0.15);
      --shadow-neon: 0 0 20px rgba(0, 240, 168, 0.2);
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      background-color: var(--bg-deep-black);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-primary);
      font-weight: 600;
    }
    
    a {
      text-decoration: none;
      color: var(--text-secondary);
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--primary-neon);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* ----- 导航区 (极简高端文字导航) ----- */
    .navbar-custom {
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.8rem 0;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: var(--transition-smooth);
    }
    
    .navbar-brand {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .navbar-brand i {
      color: var(--primary-neon);
      font-size: 1.8rem;
      text-shadow: 0 0 12px var(--primary-neon);
    }
    .navbar-brand:hover {
      color: var(--text-primary);
    }
    
    .navbar-nav .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.2rem;
      position: relative;
      transition: var(--transition-smooth);
    }
    .navbar-nav .nav-link:hover {
      color: #ffffff;
    }
    .navbar-nav .nav-link.active {
      color: var(--primary-neon) !important;
      font-weight: 600;
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background-color: var(--primary-neon);
      box-shadow: 0 0 8px var(--primary-neon);
      border-radius: 2px;
    }
    
    .btn-nav-cta {
      background: transparent;
      border: 1px solid var(--primary-neon);
      color: var(--primary-neon);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.5rem 1.5rem;
      transition: var(--transition-smooth);
    }
    .btn-nav-cta:hover {
      background: var(--primary-neon);
      color: #0A0A0F;
      box-shadow: 0 0 15px var(--primary-neon);
    }
    
    /* 区块通用 */
    section {
      padding: 6rem 0;
    }
    
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      letter-spacing: -0.01em;
      margin-bottom: 2.8rem;
      position: relative;
      display: inline-block;
      padding-left: 1.2rem;
    }
    .section-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0.2rem;
      height: 2.8rem;
      width: 4px;
      background: var(--primary-neon);
      box-shadow: 0 0 10px var(--primary-neon);
      border-radius: 4px;
    }
    
    /* Hero */
    .hero-section {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 70px;
    }
    .hero-overlay {
      background: radial-gradient(circle at 30% 40%, rgba(45,0,247,0.25) 0%, rgba(10,10,15,0.85) 80%);
      position: absolute;
      inset: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      text-shadow: 0 0 25px rgba(0,240,168,0.3);
    }
    .hero-sub {
      color: var(--text-secondary);
      font-size: 1.25rem;
      max-width: 700px;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-glow {
      background: var(--primary-neon);
      border: none;
      color: #0A0A0F;
      font-weight: 700;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      box-shadow: 0 0 18px rgba(0,240,168,0.5);
    }
    .btn-primary-glow:hover {
      background: #33ffbb;
      box-shadow: 0 0 35px var(--primary-neon);
      color: #000;
    }
    .btn-outline-neon {
      background: transparent;
      border: 1px solid var(--primary-neon);
      color: var(--primary-neon);
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      margin-left: 1rem;
      transition: var(--transition-smooth);
    }
    .btn-outline-neon:hover {
      background: var(--primary-neon);
      color: #0A0A0F;
    }
    
    /* 指标看板卡片 */
    .metric-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 1.8rem 1.5rem;
      transition: var(--transition-smooth);
      box-shadow: 0 0 15px rgba(0,240,168,0.05);
    }
    .metric-card:hover {
      transform: translateY(-5px);
      border-color: var(--primary-neon);
      box-shadow: var(--shadow-neon);
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-neon);
      display: flex;
      align-items: baseline;
      gap: 0.25rem;
    }
    .blink-dot {
      width: 10px;
      height: 10px;
      background: var(--primary-neon);
      border-radius: 50%;
      display: inline-block;
      margin-left: 8px;
      box-shadow: 0 0 10px var(--primary-neon);
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse { 0% { opacity: 0.7; } 50% { opacity: 1; } 100% { opacity: 0.7; } }
    
    /* 服务矩阵 */
    .service-large {
      background: var(--bg-dark-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--secondary-deep-purple);
      box-shadow: 0 0 25px rgba(45,0,247,0.2);
      transition: var(--transition-smooth);
    }
    .service-small {
      background: #13131c;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      padding: 2rem;
      transition: var(--transition-smooth);
    }
    .service-small:hover, .service-large:hover {
      border-color: var(--primary-neon);
    }
    
    /* 对比表格 */
    .compare-table {
      background: var(--bg-dark-card);
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .compare-highlight {
      background: rgba(0,240,168,0.05);
      border-left: 3px solid var(--primary-neon);
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(0,240,168,0.05);
      color: var(--primary-neon);
    }
    
    /* 表单 */
    .contact-bg {
      background: linear-gradient(135deg, #2D00F7 0%, #0A0A0F 90%);
      border-radius: var(--radius-card);
    }
    .form-control-dark {
      background: #0A0A0F;
      border: none;
      border-bottom: 1px solid #4a4a5a;
      color: white;
      border-radius: 0;
    }
    .form-control-dark:focus {
      border-bottom: 2px solid var(--primary-neon);
      box-shadow: 0 4px 10px rgba(0,240,168,0.2);
      background: #0A0A0F;
      color: white;
    }
    
    footer {
      background: #0A0A0F;
      border-top: 1px solid rgba(255,255,255,0.06);
      color: var(--text-secondary);
    }
    
    @media (max-width: 768px) {
      .hero-title { font-size: 2.5rem; }
      .btn-outline-neon { margin-left: 0; margin-top: 1rem; }
      .section-title { font-size: 1.8rem; }
    }