/* roulang page: index */
/* 自定义CSS变量与全局复位 */
    :root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --accent: #F4A261;
      --bg-light: #F8F9FA;
      --text-main: #1E1E1E;
      --text-muted: #6C757D;
      --border-light: #E9ECEF;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: all 0.2s ease;
      --header-height: 60px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(29, 53, 87, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: var(--transition);
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background: #1D3557;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 20px;
      font-weight: 700;
      color: white;
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 26px;
      cursor: pointer;
    }
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: #1D3557;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 24px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 600;
      text-decoration: none;
    }
    .mobile-menu .nav-cta {
      margin-top: 20px;
      padding: 12px 32px;
      font-size: 18px;
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 32px;
      }
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* Hero背景 */
    .hero-bg {
      background: linear-gradient(135deg, #1D3557 0%, #0B1D3A 100%);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-bg::before {
      content: "";
      position: absolute;
      top: 0;
      right: 0;
      width: 50%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.5;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.7) 30%, transparent 100%);
    }
    @media (max-width: 768px) {
      .hero-bg::before {
        width: 100%;
        opacity: 0.25;
      }
    }