/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #0A7E3E;
      --primary-light: #1DB954;
      --secondary: #FF6B35;
      --gradient-start: #0A7E3E;
      --gradient-mid: #1DB954;
      --gradient-end: #FF6B35;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --dark-bg: #0F1A2E;
      --text-dark: #1A1A2E;
      --text-body: #4A4A5A;
      --text-light: #FFFFFF;
      --border: #E8ECF1;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-tag: 12px;
      --font-sans: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --transition: 0.3s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 渐变文字工具 */
    .gradient-text {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    /* 导航栏样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }
    .nav-links a {
      position: relative;
      font-weight: 500;
      padding: 4px 0;
      transition: color 0.3s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      transition: width 0.3s ease;
      border-radius: 2px;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      background: linear-gradient(135deg, var(--secondary), var(--primary));
      box-shadow: 0 8px 20px rgba(10,126,62,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      backdrop-filter: blur(4px);
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-color: transparent;
      color: white;
    }
    /* 卡片渐变边框伪元素效果 */
    .card-gradient-border {
      position: relative;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .card-gradient-border:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .card-gradient-border::before {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: inherit;
      padding: 1px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      opacity: 0;
      transition: opacity 0.3s;
    }
    .card-gradient-border:hover::before {
      opacity: 1;
    }
    /* 服务卡片底部装饰条 */
    .service-decor {
      height: 3px;
      width: 40px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 4px;
      transition: width 0.3s ease;
    }
    .card-gradient-border:hover .service-decor {
      width: 100%;
    }
    /* 数字徽章动画 */
    @keyframes countPulse {
      0% { opacity: 0.8; transform: scale(0.96); }
      50% { opacity: 1; transform: scale(1.02); }
      100% { opacity: 1; transform: scale(1); }
    }
    .stat-number {
      font-weight: 800;
      font-size: 3.2rem;
      background: linear-gradient(135deg, var(--primary-light), var(--secondary));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      display: inline-block;
    }
    /* 滚动指示器浮动 */
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(6px); }
      100% { transform: translateY(0); }
    }
    .scroll-indicator {
      animation: float 2s infinite;
    }
    /* FAQ 手风琴动画 */
    .faq-item {
      border: 1px solid var(--border);
      border-radius: 16px;
      overflow: hidden;
      background: white;
      transition: border-color 0.2s;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      background: white;
    }
    .faq-icon {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      border: 2px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s;
      font-size: 18px;
      color: var(--text-body);
    }
    .faq-item.active .faq-icon {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-color: transparent;
      color: white;
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: #fafbfc;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: linear-gradient(135deg, #0F1A2E, #1a2f44);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 100;
      transform: translateX(100%);
      transition: transform 0.4s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 2rem;
      font-weight: 600;
      color: white;
      margin: 20px 0;
      position: relative;
    }
    /* 图片占位 shimmer */
    .shimmer-bg {
      background: linear-gradient(90deg, #e0e0e0 25%, #f0f0f0 50%, #e0e0e0 75%);
      background-size: 200% 100%;
      animation: shimmer 1.5s infinite;
    }
    @keyframes shimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }