/* Main CSS for University No-Dues System */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --tertiary-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #34495e;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --text-color: #333;
    --border-radius: 4px;
    --bg-color: #f9f9f9;
    --card-bg: white;
    --table-hover: #f5f5f5;
    --border-color: #ddd;
}

/* Dark mode variables */
.dark-mode {
    --primary-color: #1a2530;
    --secondary-color: #2980b9;
    --tertiary-color: #c0392b;
    --light-color: #2c3e50;
    --dark-color: #1a242f;
    --text-color: #ecf0f1;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --table-hover: #2c2c2c;
    --border-color: #444;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header styles */
header {
    background-color: var(--primary-color);
    padding: 1rem 0;
    color: white;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo a {
    color: white;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 1.5rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

/* Main content styles */
main {
    padding: 2rem 0;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: background-color 0.3s ease;
}

.card-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    font-weight: bold;
}

.card-body {
    padding: 1.5rem;
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="email"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: var(--dark-color);
}

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

.btn-primary:hover {
    background-color: #2980b9;
}

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

.btn-success:hover {
    background-color: #27ae60;
}

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

.btn-danger:hover {
    background-color: #c0392b;
}

/* Table styles */
.table {
    width: 100%;
    border-collapse: collapse;
}

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

.table th {
    background-color: var(--light-color);
    font-weight: 600;
}

.table tr:hover {
    background-color: var(--table-hover);
}

/* Alert styles */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Dashboard specific styles */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.dashboard-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.dashboard-card p {
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
}

/* Status indicators */
.status {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-pending {
    background-color: #ffeeba;
    color: #856404;
}

.status-approved {
    background-color: #d4edda;
    color: #155724;
}

.status-rejected {
    background-color: #f8d7da;
    color: #721c24;
}

/* Footer styles */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    margin-top: 2rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-links {
        margin-top: 1rem;
        flex-direction: column;
    }
    
    .nav-links li {
        margin-left: 0;
        margin-bottom: 0.5rem;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
}

/* Dark mode toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    margin-left: 1.5rem;
    cursor: pointer;
}

.theme-toggle-icon {
    font-size: 1.2rem;
    margin-right: 5px;
}