/* roulang page: index */
:root {
      --deep-obsidian: #0B0E14;
      --electric-cyan: #00E5A0;
      --lava-orange: #FF6B35;
      --frost-white: #F4F6F9;
      --graphite-gray: #1E2330;
      --text-body: #B0B8C1;
      --text-light: #E0E4E8;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.08);
      --card-shadow-hover: 0 16px 48px rgba(0,0,0,0.12);
      --border-radius-lg: 16px;
      --border-radius-btn: 50px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep-obsidian);
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--frost-white);
    }
    h1 {
      font-size: 48px;
      letter-spacing: 0.5px;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 1.5rem;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
    }
    .text-muted-custom {
      color: var(--text-body) !important;
    }
    a {
      color: var(--electric-cyan);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--lava-orange);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 自定义容器 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    #mainNav {
      background: rgba(11, 14, 20, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      transition: background 0.3s ease;
      z-index: 1000;
    }
    #mainNav.scrolled {
      background: rgba(11, 14, 20, 0.95);
    }
    .navbar-brand {
      font-weight: 800;
      font-size: 26px;
      letter-spacing: 1px;
      color: var(--electric-cyan) !important;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    .navbar-nav .nav-link {
      color: var(--frost-white) !important;
      font-weight: 500;
      margin: 0 12px;
      transition: color 0.2s;
      font-size: 15px;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--electric-cyan) !important;
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.3);
    }
    .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(255, 255, 255, 0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 992px) {
      .navbar-brand {
        position: static;
        transform: none;
        margin-right: auto;
      }
      .navbar-collapse {
        background: rgba(11, 14, 20, 0.98);
        padding: 20px;
        border-radius: 0 0 16px 16px;
      }
    }
    /* 按钮 */
    .btn-cyan {
      background: linear-gradient(90deg, var(--electric-cyan), #00c98c);
      border: none;
      color: #0B0E14;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(0,229,160,0.3);
      letter-spacing: 0.5px;
    }
    .btn-cyan:hover {
      background: linear-gradient(90deg, #00f0b0, #00d895);
      box-shadow: 0 8px 25px rgba(0,229,160,0.5);
      transform: translateY(-2px);
      color: #0B0E14;
    }
    .btn-outline-cyan {
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      background: transparent;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      transition: 0.3s;
    }
    .btn-outline-cyan:hover {
      background: var(--electric-cyan);
      color: #0B0E14;
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0B0E14 0%, #1E2330 100%);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      color: white;
    }
    #hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .data-badge {
      background: rgba(30, 35, 48, 0.7);
      backdrop-filter: blur(8px);
      border-radius: 40px;
      padding: 8px 20px;
      display: inline-flex;
      align-items: center;
      margin: 0 8px 16px;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .badge-dot {
      width: 10px;
      height: 10px;
      background: var(--lava-orange);
      border-radius: 50%;
      margin-right: 8px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,107,53,0.7); }
      70% { box-shadow: 0 0 0 8px rgba(255,107,53,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,107,53,0); }
    }
    /* 指标看板 */
    .metric-card {
      background: var(--frost-white);
      border-radius: var(--border-radius-lg);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .metric-number {
      font-family: 'DIN Alternate', 'Menlo', monospace;
      font-size: 48px;
      font-weight: 800;
      color: var(--deep-obsidian);
      line-height: 1.2;
    }
    .trend-up {
      color: #00C853;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--frost-white);
      border-radius: var(--border-radius-lg);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(0,229,160,0.1);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: transform 0.3s;
      overflow: hidden;
    }
    .service-card:hover .service-icon {
      transform: scale(1.1);
    }
    /* 对比面板 */
    .compare-left {
      background: #2A2F3A;
      border-radius: var(--border-radius-lg);
      padding: 32px;
      color: #aaa;
      border: 1px solid #3A4050;
    }
    .compare-right {
      background: rgba(0,229,160,0.05);
      border: 2px solid var(--electric-cyan);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      color: white;
      box-shadow: 0 0 20px rgba(0,229,160,0.2);
    }
    /* FAQ */
    .accordion-button {
      background-color: var(--frost-white);
      color: #1A1E2B;
      font-weight: 600;
      border-radius: 12px !important;
      box-shadow: none;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(0,229,160,0.08);
      color: #0B0E14;
    }
    .accordion-button:focus {
      box-shadow: 0 0 0 2px rgba(0,229,160,0.4);
    }
    /* 表单 */
    .form-control {
      background: transparent;
      border: none;
      border-bottom: 2px solid #3A4050;
      border-radius: 0;
      padding: 12px 8px;
      color: white;
      transition: 0.2s;
    }
    .form-control:focus {
      background: transparent;
      border-bottom: 2px solid var(--electric-cyan);
      box-shadow: none;
      color: white;
    }
    /* 页脚 */
    footer {
      background: #070A0F;
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .metric-number { font-size: 36px; }
      .navbar-nav .nav-link { margin: 6px 0; }
    }