/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --deep-ocean: #0F2B46;
      --coral-energy: #FF6B5B;
      --coral-hover: #E55A4B;
      --foam-blue: #E8EFF4;
      --warm-sand: #FDF6F0;
      --deep-teal: #1A3C34;
      --amber-glow: #FFB347;
      --text-primary: #1E2A35;
      --text-secondary: #5F6B7A;
      --border-light: #CBD5E1;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 4px 20px rgba(15,43,70,0.06);
      --shadow-hover: 0 12px 32px rgba(15,43,70,0.12);
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-mono: "SF Mono", "Menlo", monospace;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    
    body {
      font-family: var(--font-body);
      color: var(--text-primary);
      background-color: #ffffff;
      line-height: 1.7;
      font-size: 16px;
      -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;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 600;
      transition: all 0.25s ease;
      border: none;
      outline: none;
    }
    
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 导航毛玻璃效果 */
    .glass-nav {
      background: rgba(255, 255, 255, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(203, 213, 225, 0.3);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    
    .glass-nav.scrolled {
      background: rgba(255, 255, 255, 0.9);
      box-shadow: 0 4px 20px rgba(15,43,70,0.05);
    }
    
    /* 字体层级 */
    h1, h2, h3, .h1, .h2, .h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.3;
    }
    
    h1 {
      font-size: clamp(2.2rem, 6vw, 3rem);
    }
    
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.25rem);
    }
    
    h3 {
      font-size: 1.375rem;
      font-weight: 600;
    }
    
    .text-body {
      font-size: 1rem;
      line-height: 1.7;
      color: var(--text-secondary);
    }
    
    .text-small {
      font-size: 0.8125rem;
      line-height: 1.5;
      font-weight: 500;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background-color: var(--coral-energy);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-size: 0.9375rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 4px 12px rgba(255,107,91,0.3);
      transition: all 0.25s ease;
      border: 1px solid transparent;
      min-width: 44px;
      min-height: 44px;
    }
    
    .btn-primary:hover {
      background-color: var(--coral-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255,107,91,0.4);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--coral-energy);
      border: 1px solid var(--coral-energy);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-size: 0.9375rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.25s ease;
      min-width: 44px;
      min-height: 44px;
    }
    
    .btn-outline:hover {
      background: rgba(255,107,91,0.06);
      transform: scale(1.02);
    }
    
    /* 卡片系统 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--foam-blue);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255,107,91,0.4);
    }
    
    /* 动画定义 */
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }
    
    .float-animation {
      animation: float 6s ease-in-out infinite;
    }
    
    .fade-in-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    
    .fade-in-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    
    /* 汉堡菜单 */
    #mobile-menu {
      transition: opacity 0.3s ease, visibility 0.3s ease;
      opacity: 0;
      visibility: hidden;
    }
    
    #mobile-menu.active {
      opacity: 1;
      visibility: visible;
    }
    
    .menu-line {
      transition: all 0.3s ease;
    }
    
    #menu-toggle.active .menu-line:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    
    #menu-toggle.active .menu-line:nth-child(2) {
      opacity: 0;
    }
    
    #menu-toggle.active .menu-line:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    
    /* FAQ 动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-in-out;
    }
    
    .faq-item.active .faq-content {
      max-height: 200px;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--coral-energy);
    }
    
    .faq-icon {
      transition: transform 0.3s ease, color 0.2s;
    }
    
    /* 移动端样式调整 */
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      
      .hero-grid {
        grid-template-columns: 1fr !important;
      }
      
      .features-grid {
        grid-template-columns: 1fr !important;
      }
      
      .waterfall-grid {
        columns: 2 !important;
      }
      
      .compare-grid {
        grid-template-columns: 1fr !important;
      }
    }
    
    @media (max-width: 480px) {
      .waterfall-grid {
        columns: 1 !important;
      }
      
      .btn-group {
        flex-direction: column;
        align-items: stretch;
      }
    }
    
    /* 背景图区域 */
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    
    .cta-section {
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }