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

:root {
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --secondary: #FF5722;
    --success: #4CAF50;
    --danger: #F44336;
    --warning: #FF9800;
    --dark: #121212;
    --dark-secondary: #1E1E1E;
    --light: #F5F5F5;
    --text-dark: #212121;
    --text-light: #757575;
    --border: #E0E0E0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #F5F5F5;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary);
    font-size: 28px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

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

.btn-secondary:hover {
    background-color: #E64A19;
}

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

.btn-danger {
    background-color: var(--danger);
    color: white;
    padding: 8px 16px;
    width: auto;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
    width: auto;
}

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

.sidebar {
    width: 250px;
    background-color: var(--dark-secondary);
    color: white;
    padding: 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h2 {
    margin-bottom: 30px;
    font-size: 20px;
    color: var(--primary);
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    margin-bottom: 10px;
}

.sidebar a {
    color: #B0B0B0;
    text-decoration: none;
    display: block;
    padding: 12px;
    border-radius: 4px;
    transition: all 0.3s;
}

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

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 24px;
    color: var(--text-dark);
}

.logout-btn {
    background-color: var(--danger);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}

.logout-btn:hover {
    background-color: #D32F2F;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.card h2 {
    margin-bottom: 20px;
    color: var(--text-dark);
    font-size: 20px;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 10px;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

table thead {
    background-color: var(--light);
}

table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-dark);
    border-bottom: 2px solid var(--border);
}

table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

table tr:hover {
    background-color: #FAFAFA;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.action-buttons .btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Forms */
.form-container {
    max-width: 600px;
}

.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* Alerts */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
    display: none;
}

.alert.show {
    display: block;
}

.alert-success {
    background-color: #C8E6C9;
    color: #2E7D32;
    border: 1px solid #81C784;
}

.alert-error {
    background-color: #FFCDD2;
    color: #C62828;
    border: 1px solid #EF5350;
}

.alert-info {
    background-color: #B3E5FC;
    color: #01579B;
    border: 1px solid #4FC3F7;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border-left: 4px solid var(--primary);
}

.stat-card h3 {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 15px;
    }

    .main-content {
        margin-left: 0;
        padding: 15px;
    }

    .header {
        flex-direction: column;
        gap: 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    table {
        font-size: 12px;
    }

    table th, table td {
        padding: 8px;
    }
}