/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --primary-light: #FFF5F5;
      --secondary: #1D3557;
      --secondary-dark: #0B1E33;
      --accent: #F4A261;
      --accent-success: #2A9D8F;
      --bg: #F8F9FA;
      --white: #FFFFFF;
      --text: #212529;
      --text-muted: #6C757D;
      --border: #E9ECEF;
      --border-light: #DEE2E6;
      --radius-xs: 8px;
      --radius-sm: 12px;
      --radius: 16px;
      --radius-xl: 20px;
      --shadow: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'Roboto Mono', 'Inter', monospace;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    .container {
      max-width: 1200px;
      padding-left: 16px;
      padding-right: 16px;
    }
    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      padding: 12px 0;
      transition: var(--transition);
      background: transparent;
    }
    .navbar-custom.scrolled {
      background: rgba(29,53,87,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      padding: 8px 0;
    }
    .navbar-custom .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo-brand {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.8rem;
      color: #fff;
      letter-spacing: 0.5px;
      transition: var(--transition);
      white-space: nowrap;
    }
    .scrolled .logo-brand {
      color: #fff;
    }
    .nav-chips {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
    }
    .nav-chip {
      padding: 8px 16px;
      border-radius: 20px;
      font-weight: 500;
      font-size: 0.9rem;
      color: rgba(255,255,255,0.8);
      background: transparent;
      transition: var(--transition);
      white-space: nowrap;
      cursor: pointer;
    }
    .nav-chip:hover {
      background: rgba(255,255,255,0.1);
      color: #fff;
    }
    .nav-chip.active {
      background: var(--primary);
      color: #fff;
      font-weight: 600;
    }
    .scrolled .nav-chip {
      color: rgba(255,255,255,0.75);
    }
    .scrolled .nav-chip.active {
      background: var(--primary);
      color: white;
    }
    .btn-nav-cta {
      background: var(--primary);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-xs);
      transition: var(--transition);
      font-size: 0.95rem;
      white-space: nowrap;
    }
    .btn-nav-cta:hover {
      background: var(--primary-dark);
      color: #fff;
      box-shadow: 0 8px 20px rgba(230,57,70,0.3);
    }
    .navbar-toggler {
      border: none;
      color: #fff;
      font-size: 1.6rem;
      padding: 6px 10px;
      background: transparent;
    }
    .navbar-toggler:focus {
      box-shadow: none;
      outline: none;
    }
    @media (max-width: 992px) {
      .nav-chips {
        flex-direction: column;
        background: var(--secondary-dark);
        width: 100%;
        padding: 20px;
        margin-top: 12px;
        border-radius: var(--radius);
        gap: 12px;
        display: none;
      }
      .nav-chips.open {
        display: flex;
      }
      .nav-chip {
        width: 100%;
        text-align: center;
      }
    }
    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(29,53,87,0.82) 0%, rgba(11,30,51,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      color: #fff;
      padding: 100px 0 60px;
    }
    .hero-content {
      max-width: 650px;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #fff;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      padding: 14px 34px;
      font-weight: 600;
      border-radius: var(--radius-xs);
      color: #fff;
      transition: var(--transition);
      font-size: 1rem;
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      box-shadow: 0 10px 24px rgba(230,57,70,0.35);
      color: #fff;
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      padding: 14px 34px;
      font-weight: 600;
      border-radius: var(--radius-xs);
      color: #fff;
      transition: var(--transition);
      font-size: 1rem;
    }
    .btn-outline-custom:hover {
      background: rgba(230,57,70,0.1);
      border-color: #fff;
      color: #fff;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-badge-item {
      background: rgba(0,0,0,0.5);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      text-align: center;
      min-width: 120px;
    }
    .badge-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--accent);
    }
    .badge-label {
      font-size: 0.8rem;
      color: rgba(255,255,255,0.8);
    }
    @media (max-width: 576px) {
      .hero-content h1 {
        font-size: 2.2rem;
      }
      .hero-badges {
        justify-content: center;
      }
      .hero-content {
        text-align: center;
        margin: 0 auto;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 板块通用 */
    .section-padding {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 40px;
      max-width: 700px;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      transition: var(--transition);
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(29,53,87,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--secondary);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .card-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 12px;
      transition: var(--transition);
    }
    .card-link i {
      transition: transform 0.2s;
    }
    .card-link:hover i {
      transform: translateX(4px);
    }
    /* 数据徽章 */
    .data-badge-grid {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .data-chip {
      background: var(--white);
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      box-shadow: var(--shadow);
      display: flex;
      align-items: center;
      gap: 16px;
      flex: 1 1 200px;
      border-left: 4px solid var(--accent);
    }
    .data-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent);
    }
    .data-text {
      font-weight: 600;
    }
    /* 案例卡片 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: var(--transition);
      height: 100%;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 9;
      background: #ddd;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--primary);
      color: #fff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    /* 步骤流程 */
    .step-item {
      display: flex;
      gap: 20px;
      margin-bottom: 32px;
      position: relative;
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      flex-shrink: 0;
    }
    .step-line {
      border-left: 2px dashed var(--border-light);
      margin-left: 23px;
      height: 30px;
    }
    /* FAQ */
    .accordion-custom .accordion-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-xs);
      margin-bottom: 12px;
      background: var(--white);
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text);
      background: var(--white);
      box-shadow: none;
      border-radius: var(--radius-xs);
      padding: 18px 20px;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: var(--primary-light);
      color: var(--primary);
      border-left: 4px solid var(--primary);
    }
    .accordion-custom .accordion-body {
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--secondary);
      border-radius: var(--radius);
      padding: 60px 30px;
      text-align: center;
      color: #fff;
    }
    .cta-banner h2 {
      font-size: 2rem;
      font-weight: 700;
    }
    .btn-cta-large {
      background: var(--accent);
      border: none;
      color: #1e1e1e;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-xs);
      font-size: 1.1rem;
      transition: var(--transition);
    }
    .btn-cta-large:hover {
      background: #e0863a;
      color: #000;
    }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
      padding: 50px 0 20px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
      transition: var(--transition);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer h5 {
      color: #fff;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.2);
      margin-top: 30px;
      padding-top: 20px;
      font-size: 0.85rem;
      text-align: center;
    }