/* roulang page: index */
:root {
      --coral: #E07A5F;
      --coral-dark: #c96a4f;
      --deep-blue: #2C3E50;
      --footer-bg: #1A252F;
      --light-bg: #F4F7FA;
      --warm-sand: #F2E3D5;
      --jade: #3D7A6B;
      --white: #FFFFFF;
      --text-muted: #6b7b8b;
      --border-light: #e6ecf2;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-hover: 0 16px 36px rgba(0,0,0,0.08);
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --backdrop-blur: blur(12px);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--deep-blue);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, .serif-title {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    
    .section-padding {
      padding: 5rem 0;
    }
    
    /* 导航栏玻璃效果 */
    .navbar-custom {
      background: rgba(244, 247, 250, 0.85);
      backdrop-filter: var(--backdrop-blur);
      -webkit-backdrop-filter: var(--backdrop-blur);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      padding: 1rem 0;
      transition: all 0.3s ease;
    }
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--deep-blue) !important;
      letter-spacing: -0.5px;
    }
    .nav-link {
      color: var(--deep-blue) !important;
      font-weight: 500;
      margin: 0 0.25rem;
      padding: 0.5rem 1rem !important;
      border-radius: 2rem;
      transition: all 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--coral) !important;
      background: rgba(224,122,95,0.08);
    }
    .btn-cta-nav {
      background: var(--coral);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.6rem 2rem;
      font-weight: 600;
      border: none;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(224,122,95,0.3);
      white-space: nowrap;
    }
    .btn-cta-nav:hover {
      background: var(--coral-dark);
      box-shadow: 0 8px 20px rgba(224,122,95,0.4);
      transform: translateY(-1px);
      color: white;
    }
    /* 移动端全屏菜单 */
    @media (max-width: 768px) {
      .navbar-collapse {
        background: rgba(244, 247, 250, 0.98);
        backdrop-filter: blur(20px);
        border-radius: 1.5rem;
        padding: 1.5rem;
        margin-top: 1rem;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
      }
      .navbar-toggler {
        border: none;
        color: var(--deep-blue);
        font-size: 1.8rem;
      }
      .btn-cta-nav {
        display: inline-block;
        width: auto;
        margin-top: 0.5rem;
      }
    }
    
    /* Hero */
    .hero-section {
      height: 100vh;
      min-height: 650px;
      background: linear-gradient(0deg, rgba(44,62,80,0.75) 0%, rgba(44,62,80,0.2) 60%, rgba(44,62,80,0.05) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      text-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .hero-sub {
      color: rgba(255,255,255,0.9);
      font-weight: 300;
      font-size: 1.25rem;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-hero {
      background: var(--coral);
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.9rem 2.8rem;
      font-weight: 600;
      background: linear-gradient(135deg, #E07A5F, #f09a7a);
      color: white;
      box-shadow: 0 8px 18px rgba(224,122,95,0.4);
      transition: all 0.3s;
    }
    .btn-primary-hero:hover {
      filter: brightness(1.1);
      box-shadow: 0 12px 24px rgba(224,122,95,0.5);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline-hero {
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.9rem 2.5rem;
      font-weight: 500;
      background: transparent;
      transition: 0.3s;
    }
    .btn-outline-hero:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
      color: white;
    }
    .hero-widget {
      position: absolute;
      right: 2rem;
      bottom: 4rem;
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(16px);
      border-radius: 20px;
      padding: 1.2rem 2rem;
      display: flex;
      gap: 2rem;
      color: white;
    }
    .widget-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--jade);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-widget {
        position: static;
        margin-top: 2rem;
        justify-content: center;
        flex-wrap: wrap;
      }
    }
    
    /* 数据看板 */
    .data-panel {
      margin-top: -60px;
      position: relative;
      z-index: 5;
    }
    .data-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.3s;
    }
    .data-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .data-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--deep-blue);
    }
    .trend-icon {
      color: var(--jade);
      font-size: 1.2rem;
      margin-left: 0.25rem;
    }
    
    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.8rem;
    }
    .large-card {
      grid-row: span 2;
      background: linear-gradient(0deg, rgba(44,62,80,0.6), rgba(44,62,80,0.15)), url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      padding: 2.5rem;
      color: white;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      min-height: 380px;
      transition: transform 0.3s;
    }
    .large-card:hover {
      transform: scale(1.02);
    }
    .small-card {
      background: var(--warm-sand);
      border-radius: var(--radius-card);
      padding: 2rem;
      display: flex;
      align-items: center;
      gap: 1.5rem;
      transition: all 0.3s;
      border: 2px solid transparent;
    }
    .small-card:hover {
      border-color: var(--coral);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .large-card {
        grid-row: auto;
      }
    }
    
    /* 对比 */
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }
    .vs-badge {
      background: var(--coral);
      color: white;
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: var(--warm-sand);
      color: var(--deep-blue);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--coral);
      box-shadow: 0 0 0 0.2rem rgba(224,122,95,0.2);
    }
    
    /* 表单 */
    .form-control {
      border-radius: 12px;
      padding: 0.8rem 1.2rem;
      border: 1px solid var(--border-light);
      background: white;
    }
    .form-control:focus {
      border-color: var(--coral);
      box-shadow: 0 0 0 0.2rem rgba(224,122,95,0.25);
    }
    .btn-submit {
      background: linear-gradient(135deg, #E07A5F, #f09a7a);
      border: none;
      border-radius: var(--radius-btn);
      padding: 1rem;
      font-weight: 600;
      color: white;
      width: 100%;
      transition: 0.3s;
    }
    .btn-submit:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 22px rgba(224,122,95,0.5);
    }
    
    footer {
      background: var(--footer-bg);
      color: rgba(255,255,255,0.8);
    }
    footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--coral);
    }