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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    min-height: 100vh;
}

/* Navigation */
.admin-nav {
    background: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: background 0.3s;
}

.nav-menu a:hover {
    background: #34495e;
    border-radius: 5px;
}

main {
    padding: 2rem;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #333;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #555;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.btn-primary,
.btn-success,
.btn-danger {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: opacity 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-success {
    background: #27ae60;
    color: white;
    width: auto;
    padding: 0.5rem 1rem;
}

.btn-danger {
    background: #e74c3c;
    color: white;
    width: auto;
    padding: 0.5rem 1rem;
}

button:hover {
    opacity: 0.9;
}

/* Dashboard */
.dashboard h1 {
    margin-bottom: 2rem;
    color: #333;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
}

.stat-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
}

/* Users Management */
.card {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h2 {
    margin-bottom: 1rem;
    color: #333;
}

.add-user-form .form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.add-user-form input,
.add-user-form select {
    flex: 1;
}

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

.users-table th,
.users-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.users-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

.users-table tr:hover {
    background: #f8f9fa;
}

.error {
    background: #fee;
    color: #c33;
    padding: 0.75rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    text-align: center;
}

.text-muted {
    color: #999;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #f8f9fa;
    color: #666;
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .admin-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .add-user-form .form-row {
        flex-direction: column;
    }
    
    .users-table {
        font-size: 0.9rem;
    }
    
    .users-table th,
    .users-table td {
        padding: 0.5rem;
    }
}