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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
}

.admin-header {
    background: #2d3748;
    color: white;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 {
    font-size: 1.3rem;
}

.admin-header a {
    color: #cbd5e0;
    text-decoration: none;
    margin-left: 20px;
}

.admin-header a:hover {
    color: white;
}

.admin-container {
    display: flex;
    min-height: calc(100vh - 60px);
}

.admin-sidebar {
    width: 200px;
    background: #4a5568;
    padding: 20px 0;
}

.admin-sidebar a {
    display: block;
    padding: 12px 25px;
    color: #e2e8f0;
    text-decoration: none;
    transition: background 0.2s;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
    background: #2d3748;
}

.admin-main {
    flex: 1;
    padding: 30px;
}

.admin-card {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.admin-card h2 {
    margin-bottom: 20px;
    color: #2d3748;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.btn-primary {
    background: #4299e1;
    color: white;
}

.btn-primary:hover {
    background: #3182ce;
}

.btn-success {
    background: #48bb78;
    color: white;
}

.btn-success:hover {
    background: #38a169;
}

.btn-danger {
    background: #f56565;
    color: white;
}

.btn-danger:hover {
    background: #e53e3e;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #4a5568;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: #4299e1;
}

textarea.form-control {
    min-height: 300px;
    font-family: 'Courier New', monospace;
    resize: vertical;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.table th {
    background: #f7fafc;
    color: #4a5568;
    font-weight: 600;
}

.table tr:hover {
    background: #f7fafc;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.login-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2d3748;
}

.alert {
    padding: 12px 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background: #c6f6d5;
    color: #22543d;
}

.alert-error {
    background: #fed7d7;
    color: #742a2a;
}

/* 后台页面响应式设计 */
@media (max-width: 768px) {
    .admin-header {
        padding: 12px 15px;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .admin-header h1 {
        font-size: 1.1rem;
    }
    
    .admin-header a {
        margin-left: 10px;
        font-size: 0.9rem;
    }
    
    .admin-container {
        flex-direction: column;
        min-height: auto;
    }
    
    .admin-sidebar {
        width: 100%;
        padding: 10px 0;
        display: flex;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .admin-sidebar a {
        padding: 10px 15px;
        white-space: nowrap;
        border-right: 1px solid rgba(255,255,255,0.1);
        font-size: 0.9rem;
    }
    
    .admin-main {
        padding: 15px;
    }
    
    .admin-card {
        padding: 20px 15px;
    }
    
    .admin-card h2 {
        font-size: 1.2rem;
        margin-bottom: 15px;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .btn-sm {
        padding: 5px 10px;
        font-size: 0.8rem;
    }
    
    .form-control {
        padding: 8px 10px;
        font-size: 0.95rem;
    }
    
    textarea.form-control {
        min-height: 200px;
    }
    
    .table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table th,
    .table td {
        padding: 10px 8px;
        font-size: 0.85rem;
    }
    
    .login-container {
        max-width: 100%;
        margin: 50px 15px;
        padding: 30px 20px;
    }
    
    .login-container h1 {
        font-size: 1.3rem;
        margin-bottom: 25px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .admin-sidebar {
        width: 180px;
    }
    
    .admin-main {
        padding: 20px;
    }
    
    .admin-card {
        padding: 20px;
    }
}