/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Navbar */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-container h2 {
    color: #667eea;
    font-size: 24px;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links span {
    color: #666;
}

/* Login Box */
.login-box {
    max-width: 450px;
    margin: 100px auto;
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.login-box h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 10px;
    font-size: 32px;
}

.login-box h2 {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 24px;
}

.login-info {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
    text-align: center;
    font-size: 14px;
    color: #666;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
    text-align: center;
}

.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-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

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

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

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

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

/* Cards */
.card {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.card h1 {
    color: #667eea;
    margin-bottom: 20px;
}

.card h2 {
    color: #333;
    margin-bottom: 20px;
}

/* Dashboard */
.dashboard-header {
    margin-bottom: 30px;
}

.dashboard-header h1 {
    color: white;
    font-size: 36px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

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

.stat-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 {
    color: #666;
    font-size: 16px;
    margin-bottom: 10px;
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    color: #667eea;
}

/* Table */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table thead {
    background: #f8f9fa;
}

.table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: #333;
    border-bottom: 2px solid #dee2e6;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid #dee2e6;
}

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

/* Badges */
.badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

.badge-admin {
    background: #ffc107;
    color: #333;
}

.badge-user {
    background: #17a2b8;
    color: white;
}

/* User Info */
.user-info {
    display: grid;
    gap: 20px;
}

.info-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
}

.info-row label {
    font-weight: 600;
    color: #555;
}

.info-row span {
    color: #333;
}

.admin-link {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #f0f0f0;
}

/* Stat Card Link */
.stat-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: transform 0.3s;
}

.stat-card-link:hover {
    transform: translateY(-5px);
}

.stat-card-link .stat-card {
    cursor: pointer;
    transition: all 0.3s;
}

.stat-card-link:hover .stat-card {
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* Form Row */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Semester Row in Table */
.semester-row {
    background: #f8f9fa;
    font-weight: bold;
}

.semester-row td {
    padding: 20px 15px;
    font-size: 16px;
}

/* Info Display */
.info-display {
    padding: 10px 0;
}

/* Text Muted */
.text-muted {
    color: #999;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .info-row {
        grid-template-columns: 1fr;
        gap: 5px;
    }
    
    .table {
        font-size: 14px;
    }
    
    .table th,
    .table td {
        padding: 10px;
    }
}