/* roulang page: index */
:root {
      --primary-deep: #0A2E5C;
      --accent-orange: #E8472B;
      --accent-orange-hover: #C9301F;
      --bg-white: #FFFFFF;
      --bg-light-grey: #F4F7FA;
      --text-dark: #1A1A1A;
      --text-secondary: #5A6A7E;
      --text-on-dark: #FFFFFF;
      --border-light: #E2E8F0;
      --success-green: #0F7B4E;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-english: "Inter", "Segoe UI", sans-serif;
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --shadow-default: 0 2px 12px rgba(10,46,92,0.06);
      --shadow-hover: 0 8px 24px rgba(10,46,92,0.10);
      --transition-smooth: all 0.25s ease;
      --section-padding: 100px 0;
      --section-padding-mobile: 70px 0;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: var(--bg-white);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 0.75rem;
      color: var(--text-dark);
    }

    a {
      color: var(--primary-deep);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--accent-orange);
    }

    /* 图片通用设置 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 容器调整 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ---- 导航栏 (sticky) ---- */
    .navbar-custom {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      position: sticky;
      top: 0;
      z-index: 1020;
      padding: 0;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-brand {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
      text-decoration: none;
    }
    .logo-brand:hover {
      color: var(--primary-deep);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-deep);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link-item {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
      background: none;
      border: none;
    }
    .nav-link-item::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary-deep);
      transition: var(--transition-smooth);
      transform: translateX(-50%);
    }
    .nav-link-item:hover::after,
    .nav-link-item.active::after {
      width: 70%;
    }
    .mega-trigger {
      background: var(--bg-light-grey);
      border: none;
      padding: 8px 20px;
      border-radius: 40px;
      font-weight: 500;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .mega-trigger:hover {
      background: #e9edf2;
    }
    .mega-panel {
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 12px 32px rgba(0,0,0,0.08);
      border-radius: 0 0 16px 16px;
      padding: 32px 24px;
      display: none;
      z-index: 1019;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      max-width: 1100px;
      left: 50%;
      transform: translateX(-50%);
    }
    .mega-panel.show {
      display: grid;
    }
    .mega-item {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 12px;
      border-radius: 12px;
      transition: var(--transition-smooth);
    }
    .mega-item:hover {
      background: #f8fafc;
    }
    .mega-icon {
      width: 44px;
      height: 44px;
      background: #eef2f6;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-orange);
      font-size: 1.4rem;
    }
    .mega-text strong {
      font-size: 0.9rem;
      color: var(--text-dark);
    }
    .mega-text small {
      font-size: 0.75rem;
      color: var(--text-secondary);
    }

    /* 汉堡菜单 (移动端) */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.3s;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, rgba(10,46,92,0.75) 0%, rgba(10,46,92,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin: 20px 0 30px;
    }
    .btn-primary-custom {
      background: var(--accent-orange);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-primary-custom:hover {
      background: var(--accent-orange-hover);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background: white;
      color: var(--primary-deep);
    }

    /* 区块 */
    .section-block {
      padding: var(--section-padding);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .card-service {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 28px;
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card-service:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-deep);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: #eef2f6;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-orange);
      font-size: 1.8rem;
      margin-bottom: 20px;
    }

    .stats-band {
      background: var(--bg-light-grey);
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: var(--font-english);
    }

    .case-card img {
      border-radius: 12px 12px 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .faq-accordion .accordion-button {
      font-weight: 600;
      box-shadow: none;
      background: white;
    }
    .faq-accordion .accordion-item {
      border: 1px solid var(--border-light);
      border-radius: 10px;
      margin-bottom: 12px;
    }
    
    .cta-gradient {
      background: linear-gradient(135deg, var(--primary-deep) 0%, var(--accent-orange) 100%);
    }
    footer {
      background: var(--primary-deep);
      color: #B0C4DE;
    }
    footer a {
      color: #B0C4DE;
    }
    footer a:hover {
      color: white;
    }

    @media (max-width: 992px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mega-panel { grid-template-columns: 1fr; width: 90%; }
      .hero-title { font-size: 2.2rem; }
    }
    @media (max-width: 768px) {
      .hero-section { min-height: 70vh; text-align: center; }
      .section-title { font-size: 1.8rem; }
    }