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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
}

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

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: #2c3e50;
    font-size: 28px;
    margin-bottom: 10px;
}

.login-header p {
    color: #7f8c8d;
    font-size: 14px;
}

.alert {
    padding: 12px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-error {
    background: #fee;
    border: 1px solid #fcc;
    color: #c33;
}

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

.login-form label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 500;
}

.login-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-block {
    width: 100%;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 12px;
    color: #95a5a6;
}

/* Dashboard Layout */
.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: #2c3e50;
    color: white;
    padding: 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h2 {
    margin-bottom: 30px;
    font-size: 24px;
}

.sidebar nav a {
    display: block;
    padding: 12px 15px;
    color: white;
    text-decoration: none;
    margin-bottom: 5px;
    border-radius: 5px;
    transition: background 0.3s;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: #34495e;
}

.content {
    margin-right: 250px;
    flex: 1;
    padding: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.stat-icon {
    font-size: 2.5rem;
}

.stat-label {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: #2c3e50;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.chart-container {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.chart-container h3 {
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 18px;
}

/* Table Styles */
table {
    width: 100%;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

table thead {
    background: #34495e;
    color: white;
}

table th,
table td {
    padding: 15px;
    text-align: right;
}

table tbody tr:hover {
    background: #f8f9fa;
}

table tbody tr:nth-child(even) {
    background: #f9f9f9;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }
    
    .content {
        margin-right: 0;
    }
    
    .stats-grid,
    .charts-grid {
        grid-template-columns: 1fr;
    }
}