/* roulang page: index */
:root {
      --primary: #e63946;
      --primary-hover: #c1121f;
      --dark: #1a1a1a;
      --darker: #0f0f0f;
      --gray-bg: #f5f5f5;
      --text-main: #333333;
      --text-light: #555555;
      --white: #ffffff;
      --golden: #f4a261;
      --border-light: #e5e5e5;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
      --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(26,26,26,0.08);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--dark);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.25rem;
      text-decoration: none;
    }
    .logo span {
      color: var(--primary);
      background: #fde8e8;
      padding: 0.2rem 0.6rem;
      border-radius: 20px;
      font-size: 0.9rem;
      margin-left: 5px;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 0.7rem 1.8rem;
      border-radius: 30px;
      font-weight: 700;
      letter-spacing: 0.3px;
      box-shadow: 0 8px 16px rgba(230,57,70,0.25);
      transition: all 0.25s;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: 0 12px 20px rgba(230,57,70,0.35);
      color: white !important;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--dark);
      background: none;
      border: none;
      cursor: pointer;
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 1.5rem;
      gap: 1.2rem;
      border-bottom: 1px solid #eee;
      z-index: 49;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
    }
    /* 通用板块间距 */
    section {
      padding: 5rem 0;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: 40px;
      display: inline-block;
      text-decoration: none;
      letter-spacing: 0.5px;
      box-shadow: 0 10px 18px rgba(230,57,70,0.3);
      transition: all 0.3s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 14px 24px rgba(230,57,70,0.4);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 700;
      padding: 0.8rem 2.2rem;
      border-radius: 40px;
      display: inline-block;
      text-decoration: none;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: #ffe5e5;
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .card {
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
    }
    footer {
      background: var(--dark);
      color: #aaaaaa;
      padding: 4rem 0 2rem;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu.show { display: flex; }
      section { padding: 3.5rem 0; }
      h1 { font-size: 2.2rem !important; }
    }