/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-deep: #0B2B26;
      --primary-mid: #1A4A3F;
      --accent-gold: #D4AF37;
      --accent-gold-dark: #C29B2E;
      --warm-amber: #E8A838;
      --bg-light: #F5F7F6;
      --text-primary: #1E2D28;
      --text-secondary: #2C3E38;
      --text-muted: #5A6E66;
      --white: #FFFFFF;
      --border-light: rgba(11,43,38,0.08);
      --shadow-sm: 0 4px 20px rgba(11,43,38,0.06);
      --shadow-md: 0 12px 32px rgba(11,43,38,0.12);
      --shadow-gold: 0 4px 12px rgba(212,175,55,0.3);
      --radius-card: 20px;
      --radius-inner: 12px;
      --radius-btn: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'SF Pro Display', system-ui, sans-serif;
      --transition-base: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 自定义容器，配合 Tailwind */
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 640px) {
      .custom-container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 板块间距 */
    .section-gap {
      padding-top: 100px;
      padding-bottom: 100px;
    }

    @media (max-width: 768px) {
      .section-gap {
        padding-top: 70px;
        padding-bottom: 70px;
      }
    }

    /* 导航玻璃效果 */
    .glass-nav {
      background: rgba(11, 43, 38, 0.3);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 2px 12px rgba(0,0,0,0.08);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .nav-scrolled {
      background: rgba(11, 43, 38, 0.95) !important;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-link {
      color: rgba(255, 255, 255, 0.9);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 0.4rem 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }

    .nav-link:hover {
      color: #ffffff;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    /* 按钮基础 */
    .btn-primary {
      background: linear-gradient(135deg, #D4AF37 0%, #C29B2E 100%);
      color: white;
      font-weight: 600;
      border-radius: 50px;
      padding: 0.8rem 2.2rem;
      box-shadow: 0 4px 14px rgba(212,175,55,0.35);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.02em;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(212,175,55,0.45);
      color: white;
    }

    .btn-outline-gold {
      background: transparent;
      border: 1.5px solid #D4AF37;
      color: #D4AF37;
      font-weight: 600;
      border-radius: 50px;
      padding: 0.7rem 2rem;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-outline-gold:hover {
      background: #FBF3E0;
      border-color: #C29B2E;
      color: #0B2B26;
    }

    /* 卡片样式 */
    .service-card {
      background: white;
      border-radius: 20px;
      padding: 2rem 1.8rem;
      box-shadow: 0 4px 20px rgba(11,43,38,0.06);
      border: 1px solid rgba(11,43,38,0.05);
      transition: all 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 36px rgba(11,43,38,0.12);
    }

    .badge-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 2.8rem;
      color: #D4AF37;
      line-height: 1.1;
    }

    .faq-item {
      border-bottom: 1px solid rgba(11,43,38,0.08);
      padding: 1.2rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      color: #1E2D28;
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s ease;
      color: #3A4D45;
      padding-left: 2rem;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
      padding-bottom: 0.5rem;
    }

    .decorative-dot {
      width: 8px;
      height: 8px;
      background: #D4AF37;
      border-radius: 50%;
      display: inline-block;
    }

    /* 案例图片容器 */
    .case-img {
      aspect-ratio: 16 / 9;
      object-fit: cover;
      border-radius: 12px;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    /* 响应式调整辅助 */
    @media (max-width: 1024px) {
      .badge-number {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 640px) {
      .badge-number {
        font-size: 2rem;
      }
    }

    /* 汉堡菜单样式 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: #0B2B26;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      padding: 1.5rem;
      box-shadow: 0 12px 24px rgba(0,0,0,0.3);
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    .mobile-menu.open {
      display: flex;
    }