/* roulang page: index */
/* 设计令牌与全局重置 */
    :root {
      --primary: #0A6E6E;
      --primary-light: #0E8A8A;
      --accent: #F15A24;
      --accent-hover: #D94A1A;
      --bg-warm: #FAF9F7;
      --card-bg: #FFFFFF;
      --text-main: #1E2B2C;
      --text-secondary: #5F6C6D;
      --text-muted: #8E9A9B;
      --border-light: #E0E4E5;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.03);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Pro Display", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    button, input {
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s ease;
    }
    .navbar.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.3px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary-nav {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 2px 8px rgba(241,90,36,0.2);
    }
    .btn-primary-nav:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      cursor: pointer;
      color: var(--text-main);
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      z-index: 60;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.2rem;
      transform: translateX(100%);
      transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2rem;
      cursor: pointer;
    }
    
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 48px;
      text-align: center;
    }
    
    /* 卡片效果 */
    .card-hover {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    
    /* 按钮系统 */
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 4px 12px rgba(241,90,36,0.25);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: var(--card-bg);
      border-radius: 0;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .section-title { font-size: 2rem; }
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
      .container { padding: 0 20px; }
    }