/* 后台管理样式 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #111827;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
}

/* 登录页面 */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.login-card h1 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 0.5rem;
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.login-tip {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 管理后台布局 */
.admin-panel {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    padding: 2rem 1rem;
    border-right: 1px solid rgba(255,255,255,0.1);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 2rem;
    padding-left: 1rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.3s;
}

.nav-item:hover,
.nav-item.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* 主内容区 */
.admin-main {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
}

.manage-section {
    display: none;
}

.manage-section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 2rem;
}

/* 管理列表 */
.manage-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.manage-item {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border-left: 4px solid var(--primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.manage-item-content {
    flex: 1;
}

.manage-item h3 {
    margin-bottom: 0.5rem;
}

.manage-item p {
    color: var(--text-secondary);
}

.manage-item-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-edit {
    background: var(--warning);
    color: white;
}

.btn-delete {
    background: var(--danger);
    color: white;
}

.btn-secondary {
    background: var(--bg-dark);
    color: var(--text-secondary);
    border: 1px solid var(--text-muted);
}

/* 内容筛选 */
.content-filter {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-secondary);
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: white;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
}

.stat-value {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.modal-actions .btn-secondary,
.modal-actions .btn-primary {
    flex: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .admin-main {
        margin-left: 0;
    }
}