/* roulang page: index */
:root {
      --primary-deep-blue: #0A4B7A;
      --accent-teal: #00A3A3;
      --bg-light-gray: #F5F7FA;
      --cta-coral: #FF6B4A;
      --text-dark: #1E2A38;
      --text-muted: #5A6872;
      --border-light: #E2E8F0;
      --card-shadow: 0 4px 20px rgba(10, 75, 122, 0.06);
      --card-shadow-hover: 0 12px 32px rgba(10, 75, 122, 0.12);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --border-radius-input: 12px;
      --transition-smooth: 0.3s ease;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: #ffffff;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    /* 容器微调 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 板块通用间距 */
    .section-spacing {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      .section-spacing {
        padding: 3.5rem 0;
      }
    }

    /* ----- 导航 Header (白底内容平台) ----- */
    .navbar-custom {
      background-color: #ffffff;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
      padding: 0.75rem 0;
      transition: var(--transition-smooth);
    }
    .navbar-brand {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep-blue) !important;
      letter-spacing: -0.3px;
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary-deep-blue) 0%, var(--accent-teal) 100%);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: inline-block;
    }
    .nav-link-custom {
      color: var(--text-muted) !important;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.5rem 1rem !important;
      margin: 0 0.2rem;
      border-radius: 30px;
      transition: var(--transition-smooth);
    }
    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--primary-deep-blue) !important;
      background-color: rgba(10, 75, 122, 0.04);
    }
    .search-box {
      background: var(--bg-light-gray);
      border: none;
      border-radius: 50px;
      padding: 0.5rem 1rem 0.5rem 2.2rem;
      font-size: 0.9rem;
      color: var(--text-dark);
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.04);
      width: 180px;
      transition: var(--transition-smooth);
    }
    .search-box:focus {
      outline: none;
      box-shadow: inset 0 1px 6px rgba(10,75,122,0.1);
      background: #ffffff;
    }
    .search-icon {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .btn-cta-nav {
      background: var(--cta-coral);
      color: #ffffff;
      border-radius: var(--border-radius-btn);
      padding: 0.5rem 1.6rem;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      transition: var(--transition-smooth);
    }
    .btn-cta-nav:hover {
      background: #E55A3A;
      color: #fff;
    }
    @media (max-width: 992px) {
      .navbar-nav {
        margin-top: 1rem;
      }
      .search-box {
        width: 100%;
      }
    }

    /* ----- Hero 首屏 ----- */
    .hero-section {
      background-color: var(--bg-light-gray);
      padding: 4rem 0 5rem;
      position: relative;
    }
    .hero-title {
      font-weight: 700;
      font-size: 3rem;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--text-dark);
    }
    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 500px;
      margin: 1.5rem 0 2rem;
    }
    .btn-hero-cta {
      background: var(--cta-coral);
      color: #fff;
      font-weight: 600;
      padding: 0.9rem 2.5rem;
      border-radius: var(--border-radius-btn);
      font-size: 1.1rem;
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      transition: var(--transition-smooth);
    }
    .btn-hero-cta:hover {
      background: #E55A3A;
      color: #fff;
    }
    .hero-image-area {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(10,75,122,0.15);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .hero-image-area {
        min-height: 240px;
        margin-top: 2rem;
      }
    }

    /* 板块标题 */
    .section-title {
      font-weight: 600;
      font-size: 2.2rem;
      color: var(--primary-deep-blue);
      margin-bottom: 1rem;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 700px;
      margin: 0 auto 3rem;
    }

    /* 痛点卡片 */
    .pain-card {
      background: #fff;
      border-radius: var(--border-radius-card);
      padding: 2rem;
      border-left: 4px solid var(--cta-coral);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .pain-icon {
      color: var(--cta-coral);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    /* 解决方案卡片 */
    .solution-card {
      background: #fff;
      border-radius: var(--border-radius-card);
      padding: 2rem;
      border-left: 4px solid var(--accent-teal);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      border-left-width: 6px;
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }

    /* 数据卡片 */
    .metric-number {
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--accent-teal);
    }
    .progress-custom {
      height: 6px;
      background: var(--border-light);
      border-radius: 3px;
    }
    .progress-custom .progress-bar {
      background: var(--accent-teal);
      border-radius: 3px;
    }

    /* FAQ 手风琴重塑 */
    .accordion-custom .accordion-button {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: 12px !important;
      margin-bottom: 12px;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: none;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: var(--bg-light-gray);
      color: var(--primary-deep-blue);
      font-weight: 700;
    }
    .accordion-custom .accordion-button::after {
      color: var(--accent-teal);
    }
    .accordion-custom .accordion-body {
      color: var(--text-muted);
      border: none;
      padding-top: 0;
    }

    /* 证言 */
    .testimonial-card {
      background: #fff;
      border-radius: var(--border-radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
    }
    .quote-icon {
      color: var(--accent-teal);
      font-size: 2.5rem;
      opacity: 0.3;
    }

    /* CTA 区域 */
    .cta-dark-section {
      background: var(--primary-deep-blue);
      border-radius: 24px;
      padding: 3rem;
    }
    .form-input {
      background: var(--bg-light-gray);
      border: none;
      border-radius: var(--border-radius-input);
      padding: 0.8rem 1.2rem;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.04);
    }
    .form-input:focus {
      outline: none;
      border: 1px solid var(--accent-teal);
      box-shadow: 0 0 0 3px rgba(0,163,163,0.2);
    }

    /* 页脚 */
    .footer-dark {
      background: #1E2A38;
      color: #B0BEC5;
    }
    .footer-dark a {
      color: #B0BEC5;
    }
    .footer-dark a:hover {
      color: var(--accent-teal);
    }
    .footer-divider {
      border-top: 1px solid rgba(255,255,255,0.1);
    }