/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #C87A2C;
      --primary-deep: #A86520;
      --secondary-dark: #2C3E50;
      --bg-warm: #F5F0E8;
      --accent-gold: #D4AF37;
      --text-dark: #1A1A1A;
      --text-muted: #5A5A5A;
      --border-soft: #E0D9CF;
      --success: #2E7D32;
      --danger: #C62828;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-gold: 0 4px 15px rgba(200,122,44,0.3);
      --radius-card: 12px;
      --radius-btn: 6px;
      --transition: 0.3s ease;
      --max-width: 1200px;
      --section-gap: 120px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      margin: 0;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 板块间距 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 991px) {
      section {
        padding: 80px 0;
      }
    }
    @media (max-width: 575px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* ----- 导航：杂志频道式 ----- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 99;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-soft);
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent-gold);
    }
    .contact-top {
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .contact-top i {
      color: var(--primary);
      margin-right: 4px;
    }

    .nav-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--secondary-dark);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary-dark);
      cursor: pointer;
    }

    @media (max-width: 991px) {
      .nav-row {
        flex-wrap: wrap;
      }
      .hamburger {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: white;
        padding: 16px 0;
        gap: 12px;
        box-shadow: var(--shadow-sm);
        border-radius: 8px;
        margin-top: 10px;
      }
      .nav-links.active-mob {
        display: flex;
      }
      .contact-top span {
        display: none;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn {
      display: inline-block;
      font-weight: 600;
      letter-spacing: 0.5px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      box-shadow: 0 4px 12px rgba(200,122,44,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: var(--shadow-gold);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
    }
    .btn-light:hover {
      background: white;
      color: var(--secondary-dark);
    }

    /* ----- Hero ----- */
    .hero {
      background: linear-gradient(135deg, #FDF8F2 0%, #F5F0E8 100%);
      padding: 100px 0 90px;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--secondary-dark);
      line-height: 1.2;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin: 24px 0 32px;
    }
    .hero-img {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 340px;
      box-shadow: var(--shadow-md);
    }

    /* 标题装饰 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--secondary-dark);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-soft);
      padding: 28px 24px;
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
      border-color: var(--bg-warm);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .stats-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    /* 案例卡片 */
    .case-card img {
      border-radius: 12px 12px 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .tag {
      background: rgba(200,122,44,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      margin-bottom: 8px;
    }
    .faq-question {
      background: var(--bg-warm);
      padding: 16px 20px;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-radius: 6px;
    }
    .faq-answer {
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: white;
    }
    .faq-answer.open {
      max-height: 300px;
      padding: 16px 20px;
      border-left: 4px solid var(--primary);
    }

    /* CTA深色背景 */
    .cta-dark {
      background: var(--secondary-dark);
      color: white;
      border-radius: 24px;
      padding: 60px 40px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--secondary-dark);
      color: #B0BEC5;
      padding: 60px 0 20px;
    }
    .site-footer a:hover {
      color: var(--accent-gold);
    }
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
    }