/* roulang page: index */
:root {
      --bs-primary: #1E2D2B;
      --bs-body-bg: #F7F5F2;
      --bs-body-color: #2C2C2C;
      --bs-border-radius: 16px;
      --bs-border-color: #E8E5E0;
      --brand-primary: #1E2D2B;
      --brand-accent: #C89B5E;
      --brand-accent-light: rgba(200, 155, 94, 0.12);
      --brand-bg: #F7F5F2;
      --brand-text: #2C2C2C;
      --brand-muted: #6B6B6B;
      --brand-white: #FFFFFF;
      --brand-border: #E8E5E0;
      --brand-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --brand-shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --brand-radius-card: 18px;
      --brand-radius-btn: 30px;
      --brand-radius-input: 10px;
      --bs-font-sans-serif: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--bs-font-sans-serif);
      background-color: var(--brand-bg);
      color: var(--brand-text);
      line-height: 1.7;
      font-weight: 400;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 覆盖Bootstrap默认 */
    .btn {
      border-radius: var(--brand-radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
    }
    .btn-primary {
      background-color: var(--brand-accent);
      border-color: var(--brand-accent);
      color: #1E2D2B;
    }
    .btn-primary:hover {
      background-color: #b8894a;
      border-color: #b8894a;
      box-shadow: 0 8px 24px rgba(200,155,94,0.35);
    }
    .btn-outline-accent {
      border: 1px solid var(--brand-accent);
      color: var(--brand-accent);
      background: transparent;
    }
    .btn-outline-accent:hover {
      background: var(--brand-accent);
      color: #1E2D2B;
    }
    .card {
      border-radius: var(--brand-radius-card);
      border: none;
      background: var(--brand-white);
      box-shadow: var(--brand-shadow);
      transition: var(--transition-smooth);
    }
    .form-control {
      border-radius: var(--brand-radius-input);
      border: 1px solid var(--brand-border);
      background: var(--brand-white);
      padding: 0.8rem 1.2rem;
    }
    .form-control:focus {
      border-color: var(--brand-accent);
      box-shadow: 0 0 0 3px rgba(200,155,94,0.2);
    }
    /* 导航栏 */
    .navbar-custom {
      background: rgba(247,245,242,0.88);
      backdrop-filter: blur(12px);
      padding: 0.9rem 0;
      transition: background 0.3s;
      border-bottom: none;
    }
    .navbar-custom.scrolled {
      background: rgba(247,245,242,0.98);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--brand-primary) !important;
    }
    .nav-link {
      color: var(--brand-text) !important;
      margin: 0 0.6rem;
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0.2rem;
      font-size: 1rem;
    }
    .nav-link:hover {
      color: var(--brand-accent) !important;
    }
    .nav-link.active {
      color: var(--brand-accent) !important;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 2px;
      background: var(--brand-accent);
      border-radius: 2px;
    }
    .navbar-toggler {
      border: none;
      color: var(--brand-primary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 6rem 0 4rem;
    }
    .hero-title {
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.3;
      color: var(--brand-primary);
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--brand-muted);
      margin: 1.5rem 0 2rem;
      max-width: 480px;
    }
    .badge-data {
      background: var(--brand-accent-light);
      color: var(--brand-primary);
      border-radius: 30px;
      padding: 0.5rem 1.2rem;
      font-weight: 700;
      font-size: 1.5rem;
      display: inline-flex;
      align-items: baseline;
      gap: 0.3rem;
    }
    .badge-data small {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--brand-muted);
    }
    .hero-image-card {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 25px 45px rgba(0,0,0,0.08);
      background: #E8E5E0;
    }
    .section-title {
      font-weight: 700;
      font-size: 2.3rem;
      margin-bottom: 1rem;
      color: var(--brand-primary);
    }
    .section-lead {
      color: var(--brand-muted);
      font-size: 1.1rem;
    }
    .icon-wrap {
      font-size: 2rem;
      color: var(--brand-accent);
      margin-bottom: 1rem;
    }
    .advantage-card {
      padding: 2rem 1.5rem;
      height: 100%;
    }
    .advantage-card h3 {
      font-weight: 700;
      font-size: 1.4rem;
      margin: 1rem 0 0.8rem;
    }
    .micro-badge {
      background: var(--brand-accent-light);
      color: var(--brand-primary);
      border-radius: 20px;
      padding: 0.3rem 0.9rem;
      font-weight: 700;
      font-size: 0.9rem;
      display: inline-block;
    }
    .solution-card {
      border-radius: 20px;
      overflow: hidden;
    }
    .solution-card img {
      transition: transform 0.35s ease;
    }
    .solution-card:hover img {
      transform: scale(1.03);
    }
    .comparison-left {
      background: #F0EDE8;
      border-radius: 20px;
      padding: 2rem;
    }
    .comparison-right {
      background: linear-gradient(145deg, #FDF8F2, #FFFFFF);
      border: 1px solid var(--brand-accent);
      border-radius: 20px;
      padding: 2rem;
    }
    .faq-item {
      border: 1px solid var(--brand-border);
      border-radius: 14px;
      background: white;
      margin-bottom: 1rem;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 1.5rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid transparent;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--brand-accent);
      color: var(--brand-accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 1.5rem;
      color: var(--brand-muted);
      background: #fff;
    }
    .faq-item.active .faq-answer {
      max-height: 220px;
      padding: 1rem 1.5rem 1.5rem;
    }
    .contact-cta {
      background: linear-gradient(135deg, #1E2D2B 0%, #2a3b38 100%);
      border-radius: 26px;
      padding: 4rem 2rem;
    }
    .footer-dark {
      background: #1E2D2B;
      color: #B0B8B6;
    }
    .footer-dark a:hover {
      color: var(--brand-accent);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .hero-section {
        min-height: auto;
        padding: 5rem 0 2rem;
      }
      .navbar-collapse {
        background: rgba(247,245,242,0.98);
        padding: 1rem;
        border-radius: 20px;
      }
      .comparison-left, .comparison-right {
        margin-bottom: 1rem;
      }
    }