/* ========================================
   College Management System – Global Styles
   ======================================== */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f4f6f9;
    color: #333;
    line-height: 1.6;
}

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

.main-content {
    flex: 1;
    margin-left: 250px;          /* matches sidebar width */
    padding: 20px;
    background: #f4f6f9;
    transition: margin-left 0.3s;
}

.container-fluid {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

/* ---------- Sidebar (already styled in sidebar.php, but we keep a base) ---------- */
.sidebar {
    width: 250px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.8);
    padding: 12px 25px;
    display: flex;
    align-items: center;
    transition: all 0.3s;
    border-left: 3px solid transparent;
    text-decoration: none;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: white;
    background: rgba(255,255,255,0.1);
    border-left-color: white;
}

.sidebar .nav-link i {
    margin-right: 10px;
    font-size: 1.2rem;
    width: 20px;
}

/* ---------- Cards ---------- */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    border: none;
    overflow: hidden;
}

.card-header {
    background: #f8f9fa;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    font-weight: 600;
    color: #333;
}

.card-body {
    padding: 20px;
}

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

.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.table th {
    background: #f8f9fa;
    padding: 12px 15px;
    text-align: left;
    font-weight: 600;
    color: #333;
    border-bottom: 2px solid #dee2e6;
}

.table td {
    padding: 10px 15px;
    border-bottom: 1px solid #e0e0e0;
    color: #666;
    vertical-align: middle;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23333' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
    padding-right: 45px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    gap: 5px;
}

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

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

.btn-success {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.3);
}

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

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

.btn-warning {
    background: #ffc107;
    color: #333;
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.875rem;
}

/* ---------- Badges ---------- */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

/* ---------- Alerts ---------- */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

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

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

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

/* ---------- Progress Bars ---------- */
.progress {
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, #667eea, #764ba2);
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s;
}

/* ---------- Stats Cards ---------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.stat-info h4 {
    margin: 0 0 5px;
    color: #666;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-number {
    margin: 0;
    color: #333;
    font-size: 2rem;
    font-weight: 700;
}

.stat-icon {
    font-size: 2.5rem;
    color: #667eea;
    opacity: 0.8;
}

/* ---------- Exam Cards (used in exam listing pages) ---------- */
.exam-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-left: 4px solid #667eea;
    transition: transform 0.3s;
}

.exam-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.exam-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
}

.exam-type {
    background: #e9ecef;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: #495057;
}

.exam-details {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 10px;
    color: #666;
}

.detail-item i {
    margin-right: 5px;
    color: #667eea;
}

/* ---------- Batch Cards (used in manage_batches) ---------- */
.batch-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-left: 4px solid #28a745;
    transition: transform 0.3s;
}

.batch-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

/* ---------- Welcome Cards (dashboard) ---------- */
.welcome-card {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

/* ---------- Filter Cards ---------- */
.filter-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

/* ---------- Quick Action Buttons ---------- */
.quick-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.quick-btn {
    padding: 8px 15px;
    border-radius: 6px;
    border: 1px solid #ddd;
    background: white;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.quick-btn:hover {
    background: #f0f0f0;
}

/* ---------- Legend (for attendance) ---------- */
.legend {
    display: flex;
    gap: 20px;
    margin: 15px 0;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.color-present { background: #d4edda; border: 2px solid #28a745; }
.color-late { background: #fff3cd; border: 2px solid #ffc107; }
.color-absent { background: #f8d7da; border: 2px solid #dc3545; }

/* ---------- Print Styles ---------- */
@media print {
    .sidebar,
    .btn,
    .navbar,
    .filter-card,
    .quick-actions,
    .legend,
    footer {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
        padding: 20px !important;
    }

    .card, .table, .exam-card, .batch-card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }

    .main-content {
        margin-left: 0;
    }

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

    .exam-details {
        flex-direction: column;
        gap: 5px;
    }

    .quick-actions {
        flex-direction: column;
    }

    .legend {
        flex-direction: column;
        gap: 10px;
    }

    .table-responsive {
        overflow-x: auto;
    }
}