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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    min-height: 100vh;
}

/* ── Login ── */
.login-body {
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.97);
    border-radius: 16px;
    padding: 40px 35px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

.login-card h3 {
    font-weight: 700;
    color: #1a1a2e;
    letter-spacing: -0.5px;
}

.login-card .form-control,
.login-card .form-select {
    border-radius: 8px;
    border: 1.5px solid #e2e8f0;
    padding: 11px 14px;
    font-size: 14px;
    transition: 0.2s;
}

.login-card .form-control:focus,
.login-card .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.login-card .btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-weight: 600;
    font-size: 15px;
    transition: 0.3s;
}

.login-card .btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px -5px rgba(102, 126, 234, 0.4);
}

/* ── Sidebar ── */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

.sidebar .brand {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    padding: 24px 24px 10px;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar .brand-sub {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.4);
    padding: 0 24px 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    margin-bottom: 8px;
}

.sidebar .sidebar-section {
    padding: 16px 24px 6px;
    color: rgba(255, 255, 255, 0.3);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 24px;
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    margin: 1px 0;
}

.sidebar a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    border-left-color: #667eea;
}

.sidebar a.active {
    background: rgba(102, 126, 234, 0.15);
    color: #fff;
    border-left-color: #667eea;
}

.sidebar a .icon {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar a.logout-link {
    margin-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 14px;
    color: rgba(255, 100, 100, 0.6);
}

.sidebar a.logout-link:hover {
    color: #ff6b6b;
    background: rgba(255, 100, 100, 0.08);
}

/* ── Sidebar toggle ── */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1100;
    background: #1a1a2e;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

/* ── Main content ── */
.main-content {
    margin-left: 260px;
    padding: 24px 28px;
    min-height: 100vh;
}

/* ── Top navbar ── */
.navbar {
    background: #fff;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h4 {
    font-weight: 700;
    color: #1a1a2e;
    text-transform: capitalize;
    margin: 0;
    font-size: 20px;
}

.navbar .user-badges {
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar .badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 13px;
}

/* ── Cards ── */
.card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    margin-bottom: 20px;
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card h5 {
    font-weight: 700;
    color: #1a1a2e;
    font-size: 16px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid #f0f2f5;
}

/* ── Stats cards ── */
.stats-card {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.25);
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stats-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.35);
}

.stats-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
}

.stats-card .stats-icon {
    font-size: 28px;
    margin-bottom: 12px;
    opacity: 0.9;
}

.stats-card h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 2px;
}

.stats-card p {
    opacity: 0.8;
    font-size: 14px;
    margin: 0;
    font-weight: 500;
}

/* ── Tables ── */
.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 14px;
}

.table thead th {
    background: #f8fafc;
    padding: 12px 14px;
    font-weight: 600;
    color: #475569;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid #e2e8f0;
}

.table tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid #f1f5f9;
    vertical-align: middle;
}

.table tbody tr:hover {
    background: #f8fafc;
}

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

.table tbody tr:nth-child(even):hover {
    background: #f1f5f9;
}

/* ── Buttons ── */
.btn {
    padding: 8px 18px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 13px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-sm {
    padding: 5px 12px;
    font-size: 12px;
    border-radius: 6px;
}

.btn-primary {
    background: #667eea;
    color: #fff;
}
.btn-primary:hover {
    background: #5a6fd6;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-success {
    background: #10b981;
    color: #fff;
}
.btn-success:hover {
    background: #059669;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-danger {
    background: #ef4444;
    color: #fff;
}
.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-warning {
    background: #f59e0b;
    color: #fff;
}
.btn-warning:hover {
    background: #d97706;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-secondary {
    background: #94a3b8;
    color: #fff;
}
.btn-secondary:hover {
    background: #64748b;
}

.btn-info {
    background: #06b6d4;
    color: #fff;
}
.btn-info:hover {
    background: #0891b2;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

/* ── Form controls ── */
.form-control, .form-select {
    padding: 10px 14px;
    border: 1.5px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: 0.2s;
    background: #fff;
}

.form-control:focus, .form-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.form-label {
    font-weight: 600;
    color: #374151;
    font-size: 13px;
    margin-bottom: 6px;
}

/* ── Input groups ── */
.input-group-text {
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
    border-right: none;
    color: #94a3b8;
    border-radius: 8px 0 0 8px;
}

.input-group .form-control {
    border-left: none;
    border-radius: 0 8px 8px 0;
}

.input-group .form-control:focus {
    border-left: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

/* ── Scrollable table wrapper ── */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ── Code style ── */
code {
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
    color: #475569;
}

/* ── Alerts ── */
.alert {
    padding: 14px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: none;
    font-weight: 500;
    font-size: 14px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

/* ── Timetable grid ── */
.timetable-grid {
    display: grid;
    grid-template-columns: 50px repeat(6, 1fr);
    gap: 2px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid #d1d5db;
}

.timetable-cell {
    background: #fff;
    padding: 6px 4px;
    min-height: 80px;
    text-align: center;
    font-size: 12px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    transition: background 0.15s;
}

.timetable-cell:hover {
    background: #fafbfc;
}

.timetable-cell.heading {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-weight: 700;
    font-size: 12px;
    min-height: 38px;
    justify-content: center;
    align-items: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timetable-cell.heading.corner {
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-size: 11px;
    letter-spacing: 0;
}

.timetable-cell.period-header {
    justify-content: center;
    align-items: center;
    min-height: 44px;
}

.timetable-cell.day-label {
    background: #f1f5f9;
    font-weight: 700;
    color: #475569;
    font-size: 14px;
    min-height: 80px;
    justify-content: center;
    align-items: center;
}

.period-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: #fff;
    border: 2px solid #94a3b8;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 700;
    color: #475569;
}

/* ── Slot item ── */
.slot-item {
    border-radius: 6px;
    padding: 5px 6px;
    margin-bottom: 3px;
    text-align: left;
    font-size: 11px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transition: transform 0.15s, box-shadow 0.15s;
}

.slot-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0,0,0,0.1);
}

.slot-item:last-child {
    margin-bottom: 0;
}

.slot-subject {
    font-weight: 700;
    font-size: 12px;
    line-height: 1.3;
}

.slot-subject-name {
    font-size: 9px;
    color: #64748b;
    line-height: 1.2;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.slot-details {
    display: flex;
    flex-wrap: wrap;
    gap: 2px 6px;
    font-size: 9px;
    color: #475569;
    margin-top: 2px;
}

.slot-staff::before { content: ''; }
.slot-class::before { content: '| '; color: #cbd5e1; }
.slot-room::before { content: '| '; color: #cbd5e1; }

.empty-slot {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 60px;
}

/* ── Timetable legend ── */
.timetable-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 10px 14px;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    font-size: 12px;
}

.timetable-legend .legend-title {
    font-weight: 600;
    color: #475569;
    margin-right: 4px;
}

.timetable-legend .legend-item {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 11px;
}

/* ── Workload bar ── */
.workload-bar {
    height: 22px;
    background: #f1f5f9;
    border-radius: 11px;
    overflow: hidden;
}

.workload-fill {
    height: 100%;
    background: linear-gradient(90deg, #10b981, #667eea);
    border-radius: 11px;
    transition: width 0.5s ease;
}

/* ── Tabs ── */
.tabs {
    display: flex;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 20px;
    gap: 0;
}

.tab-btn {
    padding: 10px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    color: #94a3b8;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: 0.2s;
}

.tab-btn:hover {
    color: #667eea;
}

.tab-btn.active {
    border-bottom-color: #667eea;
    color: #667eea;
}

.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* ── Nav tabs (bootstrap override) ── */
.nav-tabs .nav-link {
    color: #94a3b8;
    font-weight: 600;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 10px 20px;
    transition: 0.2s;
}

.nav-tabs .nav-link:hover {
    color: #667eea;
    border-color: transparent;
}

.nav-tabs .nav-link.active {
    color: #667eea;
    background: none;
    border: none;
    border-bottom: 2px solid #667eea;
}

/* ── Misc ── */
.pending-badge {
    background: #fef3c7;
    color: #92400e;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.approved-badge {
    background: #d1fae5;
    color: #065f46;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.rejected-badge {
    background: #fee2e2;
    color: #991b1b;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

/* ── Combined class badge ── */
.combined-badge {
    display: inline-block;
    background: #ede9fe;
    color: #6d28d9;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 4px;
    margin-top: 2px;
}

.slot-item {
    margin-bottom: 4px;
    padding: 4px 0;
    border-bottom: 1px dashed #e2e8f0;
    width: 100%;
}

.slot-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

/* ── Print helper ── */
@media print {
    .sidebar, .sidebar-toggle, .sidebar-overlay,
    .navbar, .card:not(#print-area) { display: none !important; }
    .main-content { margin-left: 0 !important; padding: 10px !important; }
    #print-area, #print-area * { visibility: visible; }
    #print-area { position: absolute; left: 0; top: 0; }
    #print-area .btn { display: none; }
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .sidebar-toggle { display: block; }
    .sidebar-overlay.show { display: block; }
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
        padding: 16px;
    }
    .navbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding-top: 50px;
    }
    .navbar h4 { font-size: 18px; }
    .table { font-size: 12px; }
    .table th, .table td { padding: 8px 10px; }
    .timetable-grid {
        grid-template-columns: 36px repeat(6, 1fr);
        font-size: 10px;
    }
    .timetable-cell { padding: 4px 2px; min-height: 60px; }
    .timetable-cell.heading { font-size: 10px; min-height: 32px; }
    .timetable-cell.day-label { font-size: 10px; min-height: 60px; }
    .timetable-cell.period-header { min-height: 36px; }
    .slot-subject { font-size: 10px; }
    .slot-details { font-size: 8px; gap: 1px 4px; }
    .period-num { width: 22px; height: 22px; font-size: 11px; border-width: 1.5px; }
    .slot-subject-name { display: none; }
    .timetable-legend { font-size: 10px; }
    .stats-card h2 { font-size: 26px; }
}