/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-gradient: linear-gradient(135deg, #FF4E50 0%, #F9D423 100%);
      --primary-start: #FF4E50;
      --primary-end: #F9D423;
      --accent-green: #00C9A7;
      --dark-charcoal: #1E1E2F;
      --light-gray-bg: #F7F7FA;
      --pure-white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 12px 32px rgba(0,0,0,0.08);
      --border-radius-xl: 24px;
      --border-radius-lg: 16px;
      --border-radius-sm: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --spacing-section: 120px;
      --spacing-section-mobile: 80px;
    }
    
    /* 基础 reset */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--pure-white);
      color: var(--dark-charcoal);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    a, button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 容器布局 */
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 导航样式 - 沉浸式毛玻璃 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      transition: var(--transition-smooth);
      background: transparent;
      padding: 16px 0;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--dark-charcoal);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary-start);
    }
    .btn-primary-nav {
      background: var(--primary-gradient);
      border: none;
      color: white;
      padding: 0.7rem 2rem;
      border-radius: 50px;
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(255,78,80,0.25);
      white-space: nowrap;
    }
    .btn-primary-nav:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,78,80,0.45);
    }
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 110;
    }
    .hamburger span {
      display: block;
      width: 26px;
      height: 3px;
      background: var(--dark-charcoal);
      border-radius: 4px;
      transition: var(--transition-smooth);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      box-shadow: -8px 0 30px rgba(0,0,0,0.1);
      transform: translateX(100%);
      transition: transform 0.35s ease;
      display: flex;
      flex-direction: column;
      padding: 6rem 2rem 2rem;
      z-index: 105;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.4rem;
      padding: 1rem 0;
      border-bottom: 1px solid #f0f0f0;
      color: var(--dark-charcoal);
      text-decoration: none;
      font-weight: 600;
    }
    
    /* Hero 背景动态渐变 */
    .hero-gradient-bg {
      background: linear-gradient(135deg, #FF4E50 0%, #F9D423 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-gradient-bg::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
      border-radius: 50%;
      animation: floatBlob 12s infinite alternate ease-in-out;
    }
    @keyframes floatBlob {
      0% { transform: translate(0,0) scale(1); }
      100% { transform: translate(-30px, 40px) scale(1.1); }
    }
    
    /* 卡片组件 */
    .feature-card {
      background: var(--pure-white);
      border-radius: var(--border-radius-xl);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      border: 1px solid rgba(0,0,0,0.02);
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-hover-shadow);
      border-top: 3px solid var(--primary-start);
    }
    .stat-badge {
      background: #f0fdf7;
      color: var(--accent-green);
      font-weight: 700;
      padding: 0.4rem 1rem;
      border-radius: 50px;
      font-size: 0.9rem;
      display: inline-block;
    }
    .btn-primary {
      background: var(--primary-gradient);
      border: none;
      color: white;
      padding: 0.9rem 2.4rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 6px 18px rgba(255,78,80,0.3);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(255,78,80,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 0.9rem 2.4rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      transform: translateY(-2px);
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      background: #FAFAFC;
      border-radius: 12px;
      margin-bottom: 1rem;
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: border 0.2s;
    }
    .faq-item.active .faq-question {
      border-left: 4px solid var(--primary-start);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 1.8rem;
      color: #4b4b5a;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 1.8rem 1.5rem;
    }
    
    /* 场景横向滚动卡片 */
    .scroll-cards {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-card {
      min-width: 260px;
      background: white;
      border-radius: 20px;
      padding: 1.8rem;
      box-shadow: var(--card-shadow);
      scroll-snap-align: start;
      transition: var(--transition-smooth);
    }
    .scroll-card:hover {
      transform: scale(1.02);
      box-shadow: var(--card-hover-shadow);
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    @media (max-width: 768px) {
      :root {
        --spacing-section: 80px;
      }
      .container { padding-left: 20px; padding-right: 20px; }
      h1 { font-size: 2.2rem !important; line-height: 1.3 !important; }
      h2 { font-size: 1.8rem !important; }
    }

@keyframes pulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(255,78,80,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(255,78,80,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,78,80,0); }
    }