/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-hover: #F1525D;
      --primary-dark: #c5303c;
      --secondary: #1D3557;
      --secondary-light: #2a4a7a;
      --accent: #F4A261;
      --accent-light: #f7b27a;
      --bg-light: #F8F9FA;
      --bg-gray: #F1F3F5;
      --text-dark: #1D3557;
      --text-body: #495057;
      --text-muted: #6C757D;
      --text-white: #FFFFFF;
      --text-white-70: rgba(255,255,255,0.7);
      --text-white-80: rgba(255,255,255,0.8);
      --border-light: #DEE2E6;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(29,53,87,0.12);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-nav: 40px;
      --radius-input: 8px;
      --font-title: 'Poppins', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --transition-base: 0.25s ease;
      --container-max: 1320px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .font-title {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      transition: var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 576px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 悬浮胶囊导航 */
    .navbar-custom {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1030;
      width: auto;
      max-width: 720px;
      background: rgba(29, 53, 87, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-nav);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    }
    .nav-brand {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 20px;
      color: var(--text-white);
      letter-spacing: 1px;
      margin-right: 24px;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 18px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-white-70);
      padding: 6px 4px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--text-white);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 3px;
      background-color: var(--accent);
      border-radius: 3px;
      transition: width 0.25s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--primary);
      color: white;
      font-weight: 600;
      font-size: 14px;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      border: none;
      margin-left: 16px;
      white-space: nowrap;
      transition: background 0.25s, transform 0.2s;
    }
    .btn-nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    /* 移动端底部导航 */
    @media (max-width: 768px) {
      .navbar-custom {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        transform: none;
        border-radius: 30px 30px 0 0;
        max-width: 100%;
        padding: 12px 20px;
        background: rgba(29, 53, 87, 0.92);
        justify-content: center;
      }
      .nav-brand {
        display: none;
      }
      .nav-menu {
        gap: 4px;
        width: 100%;
        justify-content: space-around;
      }
      .nav-link {
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        color: rgba(255,255,255,0.8);
      }
      .btn-nav-cta {
        margin-left: 0;
        font-size: 12px;
        padding: 6px 16px;
        background: var(--primary);
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #1D3557 0%, #0B1A2F 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      color: white;
    }
    .hero-speed-lines {
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(255,255,255,0.03) 2px, rgba(255,255,255,0.03) 4px);
      pointer-events: none;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-white-80);
      max-width: 520px;
      margin-bottom: 32px;
    }
    .btn-hero-primary {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      margin-right: 16px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(0,0,0,0.2);
      background: #f8f9fa;
    }
    .btn-hero-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: transform 0.2s, background 0.2s;
    }
    .btn-hero-outline:hover {
      transform: translateY(-2px);
      background: rgba(255,255,255,0.1);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 340px;
      border-radius: 24px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(29,53,87,0.25);
      border-radius: 24px;
    }
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.5rem;
      }
    }
    @media (max-width: 576px) {
      .hero-title {
        font-size: 2rem;
      }
      .btn-hero-primary, .btn-hero-outline {
        display: block;
        width: 100%;
        margin-bottom: 12px;
        text-align: center;
      }
    }

    /* 通用区块 */
    .section-padding {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 优势卡片 */
    .advantage-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s;
      height: 100%;
    }
    .advantage-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .advantage-icon {
      font-size: 48px;
      color: var(--primary);
      margin-bottom: 20px;
      display: inline-block;
      transition: transform 0.2s;
    }
    .advantage-card:hover .advantage-icon {
      transform: scale(1.05);
    }

    /* 数据面板 */
    .stats-panel {
      background: var(--secondary);
      padding: 80px 0;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
      font-size: 0.95rem;
    }
    .stat-divider {
      border-left: 1px solid rgba(255,255,255,0.25);
      height: 60px;
    }
    @media (max-width: 768px) {
      .stat-divider {
        display: none;
      }
    }

    /* 服务卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border-top: 4px solid var(--primary);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(transparent 40%, rgba(29,53,87,0.7));
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--secondary);
      background: white;
      box-shadow: none;
      border: 1px solid var(--border-light);
      border-radius: 12px !important;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background-color: #f8f9fa;
      color: var(--primary);
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      background: transparent;
    }

    /* CTA 全局 */
    .cta-global {
      background: linear-gradient(135deg, #1D3557, #0B1A2F);
      padding: 100px 0;
    }
    .btn-cta-large {
      background: var(--primary);
      color: white;
      font-weight: 700;
      padding: 16px 42px;
      border-radius: 60px;
      font-size: 1.2rem;
      border: none;
      transition: 0.2s;
      display: inline-block;
    }
    .btn-cta-large:hover {
      background: var(--primary-hover);
      transform: translateY(-3px);
      box-shadow: 0 0 24px rgba(230,57,70,0.6);
    }

    /* Footer */
    .footer {
      background: #0B1A2F;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-brand {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      color: white;
    }