/* roulang page: index */
:root {
      --primary: #1A3C2A;
      --accent: #F5A623;
      --bg: #F7F5F0;
      --text: #1E1E1E;
      --text-secondary: #4A4A4A;
      --emphasis: #E94E1B;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.08);
      --border-light: #EAE6DD;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -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, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(10px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 0 var(--border-light);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.3rem;
      position: relative;
    }
    .logo-icon::after {
      content: "🐼";
      font-size: 1.2rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--primary);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
      padding: 8px;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        font-size: 1.5rem;
        backdrop-filter: blur(12px);
        z-index: 40;
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }
    /* 按钮 */
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
    }
    .btn-primary:hover {
      background: #E0940F;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(245,166,35,0.4);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
      transform: translateY(-2px);
    }
    .btn-emphasis {
      background: var(--emphasis);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      cursor: pointer;
    }
    .btn-emphasis:hover {
      background: #C43D14;
    }
    /* 卡片 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--accent);
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .decor-line {
      width: 60px;
      height: 4px;
      background: var(--accent);
      margin: 16px 0 32px;
    }