/* roulang page: index */
:root {
      --deep-space: #0B1D3A;
      --dark-purple: #1E0F3B;
      --bg-gradient-start: #0B1D3A;
      --bg-gradient-end: #050814;
      --star-orange: #FF6B35;
      --data-cyan: #00E5FF;
      --text-primary: #E8E8EF;
      --text-white: #FFFFFF;
      --text-muted: #9A9ABF;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --btn-radius: 8px;
      --card-radius: 12px;
      --input-radius: 6px;
      --font-heading: 'Inter', 'Roboto', 'SF Pro Display', system-ui, -apple-system, sans-serif;
      --font-body: 'Inter', 'Roboto', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background: radial-gradient(ellipse at 20% 10%, var(--dark-purple) 0%, var(--bg-gradient-start) 60%, var(--bg-gradient-end) 100%);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, .data-number {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: -0.02em;
    }
    
    .data-number {
      font-family: 'Inter', 'Roboto', monospace;
      font-weight: 800;
      font-feature-settings: "tnum";
      letter-spacing: -0.03em;
    }
    
    a {
      text-decoration: none;
      color: var(--text-primary);
      transition: var(--transition-smooth);
    }
    
    a:hover {
      color: var(--star-orange);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 自定义容器微调 */
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* ----- 导航栏：居中Logo + 两侧链接，玻璃质感 ----- */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      background: rgba(10, 10, 30, 0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.75rem 0;
      transition: background 0.3s ease;
    }
    
    .navbar-custom.scrolled {
      background: rgba(8, 12, 28, 0.85);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    
    .nav-logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--text-white);
      letter-spacing: 1px;
      background: linear-gradient(135deg, var(--star-orange), var(--data-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    
    .nav-logo i {
      background: none;
      -webkit-text-fill-color: var(--star-orange);
      font-size: 1.8rem;
    }
    
    .navbar-nav .nav-link {
      color: var(--text-primary) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem !important;
      border-radius: 6px;
      transition: var(--transition-smooth);
    }
    
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--star-orange) !important;
      background: rgba(255,107,53,0.08);
    }
    
    .btn-consult {
      background: transparent;
      border: 1px solid var(--star-orange);
      color: var(--star-orange);
      padding: 0.4rem 1.2rem;
      border-radius: 2rem;
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    
    .btn-consult:hover {
      background: var(--star-orange);
      color: #fff;
    }
    
    /* 移动端全屏菜单 */
    @media (max-width: 991.98px) {
      .navbar-collapse {
        background: rgba(10, 10, 30, 0.96);
        backdrop-filter: blur(20px);
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        transition: 0.3s;
      }
      .navbar-nav {
        flex-direction: column;
        gap: 1.8rem;
      }
      .navbar-nav .nav-link {
        font-size: 2rem;
        font-weight: 600;
      }
    }
    
    /* ----- 按钮系统 ----- */
    .btn-primary-custom {
      background: var(--star-orange);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: var(--btn-radius);
      transition: var(--transition-smooth);
      box-shadow: 0 4px 14px rgba(255,107,53,0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary-custom:hover {
      background: #ff7f50;
      transform: scale(1.03);
      color: #fff;
      box-shadow: 0 8px 22px rgba(255,107,53,0.5);
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--data-cyan);
      color: var(--data-cyan);
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: var(--btn-radius);
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background: var(--data-cyan);
      color: #0B1D3A;
      border-color: var(--data-cyan);
    }
    
    /* Hero 粒子背景占位 */
    .hero-section {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(11, 29, 58, 0.7);
    }
    
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(30,15,59,0.5) 0%, transparent 70%);
    }
    
    /* 指标卡片 */
    .metric-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--card-radius);
      padding: 2rem 1.5rem;
      backdrop-filter: blur(4px);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s;
      border-top: 3px solid var(--star-orange);
    }
    .metric-card:hover {
      transform: translateY(-5px);
      border-color: var(--data-cyan);
    }
    .metric-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--text-white);
      text-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    
    /* 服务非对称栅格 */
    .service-main-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--card-radius);
      padding: 2.5rem;
      height: 100%;
      transition: 0.3s;
    }
    .service-main-card:hover {
      border-color: var(--star-orange);
    }
    
    /* 对比区域 */
    .comparison-slider {
      background: rgba(0,0,0,0.3);
      border-radius: 16px;
      padding: 2rem;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .highlight-diff {
      color: var(--data-cyan);
      font-weight: 700;
    }
    
    /* FAQ 手风琴 */
    .accordion-button {
      background: rgba(255,255,255,0.04);
      color: var(--text-white);
      font-weight: 600;
      border: none;
      border-radius: 8px !important;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(255,107,53,0.15);
      color: var(--star-orange);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: invert(1);
    }
    
    /* 表单 */
    .form-control-dark {
      background: rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
      border-radius: var(--input-radius);
      padding: 0.8rem;
    }
    .form-control-dark:focus {
      border-color: var(--star-orange);
      box-shadow: 0 0 0 0.2rem rgba(255,107,53,0.25);
      background: rgba(0,0,0,0.7);
    }
    
    footer a {
      color: var(--text-muted);
    }
    footer a:hover {
      color: var(--data-cyan);
      text-decoration: underline;
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      .metric-number { font-size: 2.5rem; }
    }