/* 顶级导航栏样式 */
.main-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    padding: 0 2rem;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    transition: transform 0.2s ease;
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(66, 153, 225, 0.3));
}

.nav {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-link {
    color: #64748b;
    font-weight: 500;
    text-decoration: none;
    /*padding: 0.75rem 1rem;*/
    border-radius: var(--radius-md);
    position: relative;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--primary-blue);
    border-radius: 1px;
    transition: transform 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
    background: rgba(66, 153, 225, 0.08);
}

.nav-link:hover::before,
.nav-link.active::before {
    transform: translateX(-50%) scaleX(1);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), #667eea);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(66, 153, 225, 0.3);
    text-decoration: none;
}

.user-avatar:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 153, 225, 0.4);
}

.user-name {
    color: #374151;
    font-weight: 500;
    font-size: 0.9rem;
}

.logout-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    margin-left: 0.5rem;
}

.logout-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(220, 53, 69, 0.3);
}

.logout-btn svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-header {
        padding: 0 1rem;
        height: 64px;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .nav-link {
        padding: 0rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .logo {
        font-size: 1.3rem;
    }
    
    .logo-icon {
        font-size: 1.8rem;
    }
    
    .user-menu {
        gap: 0.75rem;
    }
    
    .user-avatar {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .logout-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .nav {
        display: none;
    }
    
    .main-header {
        justify-content: space-between;
    }
    
    .user-name {
        display: none;
    }
}

/* 页面内容区域需要添加顶部间距以避免被固定导航栏遮挡 */
.page-with-navbar {
    padding-top: 72px;
}

.page-with-navbar .page-container {
    padding-top: 2rem;
}