/* roulang page: index */
:root {
      --primary-deep: #0A2647;
      --accent-coral: #E76F51;
      --accent-coral-hover: #D65A3B;
      --bg-light: #F8F9FA;
      --bg-blueish: #EFF6FF;
      --text-dark: #1E293B;
      --text-muted: #64748B;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-dock: 40px;
      --shadow-card: 0 4px 14px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-h1: 2.75rem;
      --font-h2: 2rem;
      --font-h3: 1.25rem;
      --font-body: 1rem;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      font-size: var(--font-body);
      padding-top: 80px; /* 给浮动导航留出空间 */
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 浮动导航 Dock */
    .navbar-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      padding: 8px 20px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      z-index: 1050;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border: 1px solid rgba(255,255,255,0.5);
    }
    .navbar-dock .logo {
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .navbar-dock .logo i {
      color: var(--accent-coral);
      font-size: 1.8rem;
      transform: rotate(-10deg);
    }
    .nav-links {
      display: flex;
      gap: 1.5rem;
      align-items: center;
      margin: 0;
      padding: 0;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      font-size: 0.95rem;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-coral);
      border-bottom-color: var(--accent-coral);
    }
    .nav-cta {
      background: var(--accent-coral);
      color: white !important;
      border-radius: 30px;
      padding: 8px 18px !important;
      font-weight: 600;
      border: none;
      transition: var(--transition);
    }
    .nav-cta:hover {
      background: var(--accent-coral-hover);
      color: white !important;
      border-bottom: none !important;
    }
    .navbar-toggler-custom {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      padding: 0;
    }
    @media (max-width: 768px) {
      .navbar-dock {
        width: 94%;
        padding: 10px 16px;
        top: 8px;
        border-radius: 32px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
        border-radius: 28px;
        padding: 20px;
        gap: 14px;
      }
      .nav-links.show {
        display: flex;
      }
      .navbar-toggler-custom {
        display: block;
      }
      body {
        padding-top: 70px;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, rgba(10,38,71,0.82) 0%, rgba(10,38,71,0.5) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      border-radius: 0 0 40px 40px;
      overflow: hidden;
    }
    .hero-content h1 {
      font-size: var(--font-h1);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .hero-content .lead {
      font-size: 1.2rem;
      opacity: 0.9;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-custom {
      background: var(--accent-coral);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background: var(--accent-coral-hover);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: white;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2rem;
      }
      .hero-section {
        min-height: 80vh;
        border-radius: 0 0 24px 24px;
      }
    }

    /* 通用板块 */
    .section-padding {
      padding: 5rem 0;
    }
    .section-title {
      font-size: var(--font-h2);
      margin-bottom: 1rem;
      color: var(--primary-deep);
      position: relative;
    }
    .section-subtitle {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 3rem;
    }

    /* 卡片 */
    .card-custom {
      background: var(--card-bg);
      border: none;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
      border: 1px solid var(--accent-coral);
    }
    .card-img-top {
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
      background: #E2E8F0;
    }

    /* 数据区 */
    .stats-bar {
      background: var(--bg-blueish);
      border-radius: 32px;
      padding: 2.5rem 2rem;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-coral);
      line-height: 1.2;
    }

    /* 案例卡片 */
    .case-card img {
      transition: transform 0.4s ease;
      height: 220px;
      object-fit: cover;
    }
    .case-card:hover img {
      transform: scale(1.05);
    }

    /* FAQ 手风琴 */
    .accordion-custom .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border-radius: 8px !important;
      padding: 1.2rem 1.5rem;
      color: var(--text-dark);
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: white;
      color: var(--primary-deep);
      border-left: 5px solid var(--accent-coral);
      box-shadow: none;
    }
    .accordion-custom .accordion-item {
      border: none;
      margin-bottom: 12px;
      background: transparent;
      border-radius: 8px;
    }
    .accordion-custom .accordion-body {
      background: #F8F9FA;
      border-radius: 0 0 8px 8px;
      color: var(--text-muted);
    }

    /* 联系表单 */
    .form-control-custom {
      border-radius: 8px;
      border: 1px solid var(--border-light);
      padding: 12px 16px;
    }
    .form-control-custom:focus {
      border-color: var(--primary-deep);
      box-shadow: 0 0 0 0.2rem rgba(10,38,71,0.15);
    }

    /* Footer */
    .footer-dark {
      background: var(--primary-deep);
      color: #CBD5E1;
      border-radius: 30px 30px 0 0;
    }
    .footer-dark a {
      color: #CBD5E1;
    }
    .footer-dark a:hover {
      color: white;
    }