/* 统一导航栏样式 */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: var(--white, #fff); box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.nav-wrapper { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 40px; border-radius: 4px; }
.logo-text { font-size: 20px; font-weight: 700; color: var(--primary, #6c5ce7); }
.main-nav ul { display: flex; gap: 5px; list-style: none; margin: 0; padding: 0; }
.main-nav a { padding: 10px 18px; font-size: 15px; color: var(--text-secondary, #636e72); border-radius: 8px; text-decoration: none; transition: all 0.3s; }
.main-nav a:hover, .main-nav a.active { color: var(--primary, #6c5ce7); background: rgba(108,92,231,0.1); }
.nav-item { position: relative; }
.nav-item.has-dropdown > a { cursor: pointer; }
.nav-item.has-dropdown > a i { font-size: 10px; margin-left: 5px; transition: transform 0.3s; }
.nav-item.has-dropdown:hover > a i { transform: rotate(180deg); }
.dropdown-menu { position: absolute; top: 100%; left: 0; min-width: 200px; background: var(--white, #fff); border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.15); padding: 20px; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all 0.3s; }
.nav-item.has-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-content { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; min-width: 600px; }
.dropdown-menu-sm { min-width: 180px; }
.dropdown-menu-sm a { display: block; padding: 10px 15px; color: var(--text-secondary, #636e72); font-size: 14px; border-radius: 8px; }
.dropdown-menu-sm a:hover { background: var(--bg-light, #f5f6fa); color: var(--primary, #6c5ce7); }
.dropdown-column h4 { font-size: 13px; color: var(--text-muted, #b2bec3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid #eee; }
.dropdown-column a { display: block; padding: 8px 0; color: var(--text-secondary, #636e72); font-size: 14px; }
.dropdown-column a:hover { color: var(--primary, #6c5ce7); }
.nav-actions { display: flex; gap: 15px; }
.btn-login { padding: 8px 20px; font-size: 14px; border: 1px solid #ddd; border-radius: 8px; color: var(--text-primary, #2d3436); text-decoration: none; transition: all 0.3s; }
.btn-login:hover { border-color: var(--primary, #6c5ce7); color: var(--primary, #6c5ce7); }
.btn-register { padding: 8px 20px; font-size: 14px; color: #fff; background: linear-gradient(135deg, var(--primary, #6c5ce7), var(--secondary, #a29bfe)); border-radius: 8px; text-decoration: none; transition: all 0.3s; }
.btn-register:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(108,92,231,0.4); }
.mobile-menu-btn { display: none; font-size: 20px; cursor: pointer; color: var(--text-primary, #2d3436); }

@media (max-width: 992px) {
    .main-nav { display: none; }
    .mobile-menu-btn { display: block; }
    .nav-actions { display: none; }
}

/* 页面基础样式 */
body { padding-top: 70px; }