/* roulang page: index */
:root {
      --primary: #0B2B3B;
      --primary-light: #143D4C;
      --accent: #00B4A0;
      --accent-hover: #009688;
      --bg: #F5F7FA;
      --surface: #FFFFFF;
      --text: #2C3E50;
      --text-light: #5A6A7E;
      --text-muted: #B0C0CC;
      --border: #E0E6ED;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius: 16px;
      --radius-btn: 30px;
      --transition: 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
      --nav-height: 72px;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      color: var(--text);
      background-color: var(--bg);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 自定义容器与板块间距 */
    .section-padding {
      padding: 100px 0;
    }
    
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    
    /* 导航 */
    .navbar-custom {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      height: var(--nav-height);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      display: flex;
      align-items: center;
    }
    
    .navbar-custom .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    
    .logo-text {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-text span {
      color: var(--accent);
    }
    
    .nav-link-custom {
      color: var(--text);
      margin-left: 2rem;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.5rem 0;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
    }
    
    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    
    .cta-btn-nav {
      background: var(--accent);
      color: #fff;
      border-radius: 30px;
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      margin-left: 1.8rem;
      transition: all var(--transition);
      border: none;
    }
    .cta-btn-nav:hover {
      background: var(--accent-hover);
      color: #fff;
      box-shadow: 0 6px 18px rgba(0,180,160,0.3);
    }
    
    /* 移动端汉堡菜单 */
    .navbar-toggler-custom {
      border: none;
      background: transparent;
      font-size: 1.5rem;
      color: var(--primary);
    }
    
    .mobile-menu {
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      transform: translateY(-100%);
      opacity: 0;
      pointer-events: none;
      transition: all 0.35s ease;
      z-index: 1029;
      box-shadow: 0 20px 30px rgba(0,0,0,0.05);
    }
    .mobile-menu.show {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--primary);
    }
    
    /* 按钮全局 */
    .btn-primary-custom {
      background: var(--accent);
      border: none;
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 22px rgba(0,180,160,0.35);
      color: #fff;
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: #fff;
    }
    
    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0B2B3B 0%, #143D4C 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: var(--nav-height);
      color: #fff;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 1rem;
    }
    .hero-content .lead {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .dashboard-mockup {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 2rem;
      width: 100%;
      max-width: 500px;
      border: 1px solid rgba(255,255,255,0.15);
    }
    
    /* 指标看板 */
    .metric-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 2.5rem 1.5rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all var(--transition);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    
    /* 服务卡片 */
    .service-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }
    
    /* 对比卡片 */
    .compare-left {
      background: #EDF0F4;
      border-radius: var(--radius);
      padding: 2rem;
    }
    .compare-right {
      background: rgba(0,180,160,0.08);
      border-radius: var(--radius);
      padding: 2rem;
      border: 1px solid rgba(0,180,160,0.2);
    }
    
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border);
      background: transparent;
    }
    .accordion-button {
      font-weight: 600;
      background: transparent;
      box-shadow: none;
      color: var(--text);
    }
    .accordion-button:not(.collapsed) {
      color: var(--accent);
      background: transparent;
    }
    
    /* CTA 区域 */
    .cta-section {
      background: linear-gradient(135deg, #0B2B3B, #143D4C);
      border-radius: var(--radius);
      padding: 3rem;
    }
    .input-group-custom .form-control {
      border-radius: 30px 0 0 30px;
      border: none;
      padding: 0.9rem 1.5rem;
    }
    .input-group-custom .btn {
      border-radius: 0 30px 30px 0;
      background: var(--accent);
      border: none;
      color: #fff;
      padding: 0.9rem 2rem;
    }
    
    /* 页脚 */
    .footer-custom {
      background: #061F28;
      color: var(--text-muted);
    }
    .footer-custom a:hover {
      color: var(--accent);
    }
    
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2rem; }
      .metric-number { font-size: 2rem; }
    }