/* roulang page: index */
:root {
      --primary: #1A3C6E;
      --primary-hover: #122D54;
      --accent: #C59B3C;
      --accent-light: rgba(197, 155, 60, 0.12);
      --bg: #F8F9FB;
      --card-bg: #FFFFFF;
      --dark-bg: #1E2A3A;
      --darker-bg: #161F2C;
      --text: #1A1A1A;
      --text-secondary: #555555;
      --text-muted: #888888;
      --border-light: #E8ECF1;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(26, 60, 110, 0.10);
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部信息条 */
    .pre-nav {
      background-color: #EEF1F5;
      height: 36px;
      font-size: 12px;
      color: #666;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    .pre-nav .welcome {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .pre-nav .actions a {
      color: var(--accent);
      font-weight: 500;
      margin-left: 24px;
      text-decoration: underline;
      text-underline-offset: 2px;
    }
    .pre-nav .actions a:hover {
      color: var(--primary);
      text-decoration: none;
    }

    /* 主导航 */
    .navbar-custom {
      background-color: #fff;
      height: 72px;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo {
      font-family: var(--font-heading);
      font-size: 22px;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #333;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-links a.active {
      color: var(--primary);
      font-weight: 600;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }

    /* Hero */
    .hero {
      background: linear-gradient(97deg, #F8F9FB 0%, #FFFFFF 100%);
      min-height: 520px;
      display: flex;
      align-items: center;
      padding: 40px 0;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text);
      margin-bottom: 20px;
    }
    .hero-content .lead {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-md);
      font-weight: 500;
      transition: background-color var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 12px rgba(26,60,110,0.2);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(197,155,60,0.25);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-md);
      font-weight: 500;
      transition: all var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-xl);
      min-height: 380px;
      box-shadow: var(--shadow-sm);
    }

    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text);
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 痛点区 */
    .pain-points {
      background-color: #F2F4F8;
    }
    .pain-item {
      font-size: 20px;
      font-weight: 500;
      color: var(--text);
      padding: 20px 0;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: baseline;
      gap: 16px;
    }
    .pain-item i {
      color: var(--accent);
      font-size: 28px;
      opacity: 0.8;
    }

    /* 优势卡片 */
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
      height: 100%;
      border: none;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      color: var(--accent);
      font-size: 36px;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }

    /* 服务图文交替 */
    .service-row {
      display: flex;
      align-items: center;
      margin-bottom: 80px;
      gap: 48px;
    }
    .service-img {
      background-color: #E8ECF1;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .service-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .service-text h3 {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .service-text p {
      color: var(--text-secondary);
      font-size: 16px;
    }

    /* 数据区 */
    .data-section {
      background-color: var(--dark-bg);
      color: white;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      font-size: 14px;
      color: #B0B8C1;
    }

    /* 证言 */
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      position: relative;
      border-left: 4px solid var(--accent);
    }
    .testimonial-quote {
      font-size: 16px;
      font-style: italic;
      color: var(--text);
      margin-bottom: 24px;
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-custom .accordion-button {
      font-weight: 500;
      font-size: 16px;
      background: transparent;
      box-shadow: none;
      padding: 20px 0;
      color: var(--text);
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
      box-shadow: none;
    }
    .accordion-custom .accordion-button::after {
      filter: invert(30%);
    }
    .accordion-custom .accordion-body {
      padding: 0 0 20px 0;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #F0F4FA 0%, #FFFFFF 100%);
    }

    /* 页脚 */
    .footer {
      background-color: var(--dark-bg);
      color: #B0B8C1;
      padding: 60px 0 20px;
    }
    .footer h5 {
      color: white;
      font-size: 16px;
      margin-bottom: 20px;
    }
    .footer a {
      color: #B0B8C1;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      background-color: var(--darker-bg);
      font-size: 13px;
      color: #8A94A1;
    }

    @media (max-width: 992px) {
      .hero-content h1 { font-size: 36px; }
      .section-title { font-size: 30px; }
      .service-row { flex-direction: column; }
      .service-row:nth-child(even) { flex-direction: column-reverse; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero { min-height: auto; padding: 60px 0; }
      .hero-content h1 { font-size: 28px; }
      .section { padding: 60px 0; }
    }