/* ===== CSS Variables (Light theme: "Sky") ===== */
:root {
    --primary: #3f7d8c;
    --primary-light: #4f96a8;
    --primary-dark: #346775;
    --primary-bg: rgba(63, 125, 140, 0.1);
    --success: #4f8a68;
    --success-bg: rgba(79, 138, 104, 0.1);
    --warning: #a3803f;
    --warning-bg: rgba(163, 128, 63, 0.11);
    --danger: #b05f5f;
    --danger-bg: rgba(176, 95, 95, 0.1);
    --info: #4f7f96;
    --info-bg: rgba(79, 127, 150, 0.1);
    --surface: #fbfdfe;
    --surface-hover: #e8f0f5;
    --bg: #eef4f8;
    --bg-alt: #e3ecf2;
    --text: #414a58;
    --text-muted: #6d7684;
    --text-light: #98a0ab;
    --border: #cbdae2;
    --border-light: #dde8ee;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --radius: 0.625rem;
    --radius-lg: 0.875rem;
    --radius-xl: 1rem;
    --transition: 0.2s ease;
}

/* ===== Dark Theme (default): "Muted Teal" ===== */
[data-theme="dark"] {
    --primary: #8fbcb5;
    --primary-light: #a9cec8;
    --primary-dark: #74a29b;
    --primary-bg: rgba(143, 188, 181, 0.12);
    --success: #92bda2;
    --success-bg: rgba(146, 189, 162, 0.12);
    --warning: #cfb37c;
    --warning-bg: rgba(207, 179, 124, 0.13);
    --danger: #d98c8c;
    --danger-bg: rgba(217, 140, 140, 0.12);
    --info: #86b5c6;
    --info-bg: rgba(134, 181, 198, 0.12);
    --surface: #151d1e;
    --surface-hover: #202c2e;
    --bg: #0f1516;
    --bg-alt: #1b2527;
    --text: #d5e0de;
    --text-muted: #8a9997;
    --text-light: #6a7876;
    --border: #29383a;
    --border-light: #1f2b2d;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.4);
    color-scheme: dark;
    --bs-body-bg: #0f1516;
    --bs-body-color: #d5e0de;
    --bs-border-color: #29383a;
    --bs-tertiary-bg: #151d1e;
    --bs-secondary-bg: #151d1e;
}

[data-theme="dark"] .navbar {
    background: #131b1c !important;
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select,
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background-color: var(--bg) !important;
    color: var(--text) !important;
    border-color: var(--border) !important;
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    background-color: var(--bg) !important;
    color: var(--text) !important;
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 3px rgba(143, 188, 181, 0.25) !important;
}

[data-theme="dark"] .form-control::placeholder,
[data-theme="dark"] input::placeholder { color: var(--text-light) !important; }

[data-theme="dark"] .form-control:disabled,
[data-theme="dark"] .form-control[readonly],
[data-theme="dark"] input[readonly] {
    background-color: var(--surface) !important;
    color: var(--text-muted) !important;
}

[data-theme="dark"] .btn-outline-secondary {
    color: var(--text-muted) !important;
    border-color: var(--border) !important;
}
[data-theme="dark"] .btn-outline-secondary:hover {
    background: var(--surface) !important;
    color: var(--text) !important;
}
[data-theme="dark"] .btn-outline-danger {
    color: var(--danger) !important;
    border-color: var(--danger) !important;
}
[data-theme="dark"] .btn-outline-dark {
    color: var(--text) !important;
    border-color: var(--border) !important;
}
[data-theme="dark"] .btn-outline-dark:hover {
    background: var(--surface) !important;
    color: var(--text) !important;
}
[data-theme="dark"] .btn-primary {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #0f1516 !important;
}
[data-theme="dark"] .btn-primary:hover {
    background: var(--primary-dark) !important;
    border-color: var(--primary-dark) !important;
    color: #0f1516 !important;
}
[data-theme="dark"] .btn-warning {
    background: #8a6f3d !important;
    border-color: #8a6f3d !important;
    color: #fff !important;
}
[data-theme="dark"] .btn-warning:hover {
    background: #756031 !important;
    border-color: #756031 !important;
}

[data-theme="dark"] .table { --bs-table-bg: transparent; color: var(--text); }
[data-theme="dark"] .table th { color: var(--text-muted); border-bottom-color: var(--border); }
[data-theme="dark"] .table td { color: var(--text); border-bottom-color: var(--border-light); }
[data-theme="dark"] .table-hover tbody tr:hover { background-color: var(--primary-bg) !important; }
[data-theme="dark"] .table-light { background-color: var(--bg) !important; color: var(--text); }
[data-theme="dark"] .table-light th { color: var(--text-light) !important; background-color: var(--bg) !important; }
[data-theme="dark"] .table-bordered { border-color: var(--border); }
[data-theme="dark"] .table-bordered td,
[data-theme="dark"] .table-bordered th { border-color: var(--border); }

[data-theme="dark"] .modal-content { background: var(--surface); color: var(--text); }
[data-theme="dark"] .modal-header { border-bottom-color: var(--border); }
[data-theme="dark"] .modal-footer { border-top-color: var(--border); }
[data-theme="dark"] .btn-close { filter: invert(1); }

[data-theme="dark"] .card { background: var(--surface) !important; border-color: var(--border) !important; color: var(--text); }
[data-theme="dark"] .card-header { background: var(--surface); border-bottom-color: var(--border); color: var(--text); }
[data-theme="dark"] .card-footer { background: var(--surface-hover); border-top-color: var(--border); }

[data-theme="dark"] .dropdown-menu { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .dropdown-item { color: var(--text); }
[data-theme="dark"] .dropdown-item:hover { background: var(--primary-bg); color: var(--primary-light); }

[data-theme="dark"] .bg-light { background-color: var(--surface) !important; }
[data-theme="dark"] .bg-white { background-color: var(--surface) !important; }
[data-theme="dark"] .text-dark { color: var(--text) !important; }
[data-theme="dark"] .text-muted { color: var(--text-muted) !important; }
[data-theme="dark"] .border { border-color: var(--border) !important; }
[data-theme="dark"] .border-bottom { border-bottom-color: var(--border) !important; }
[data-theme="dark"] .border-top { border-top-color: var(--border) !important; }

[data-theme="dark"] .login-card { background: var(--surface); }

[data-theme="dark"] .score-card { background: var(--bg); }

[data-theme="dark"] .answer-category-header { background: var(--bg); }
[data-theme="dark"] .answer-category-header:hover { background: var(--bg-alt); }
[data-theme="dark"] .answer-item:nth-child(odd) { background: rgba(27, 37, 39, 0.5); }

[data-theme="dark"] .option-box { border-color: var(--border); }
[data-theme="dark"] .option-box.correct { border-color: var(--success); background: var(--success-bg); }
[data-theme="dark"] .option-box.wrong { border-color: var(--danger); background: var(--danger-bg); }

[data-theme="dark"] .exam-sidebar { background: linear-gradient(180deg, #151d1e, #0f1516); }

[data-theme="dark"] .sticky-actions { background: var(--bg); border-bottom-color: var(--border); }

[data-theme="dark"] .pagination .page-link { background: var(--surface); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .pagination .page-item.active .page-link { background: var(--primary); border-color: var(--primary); color: #0f1516 !important; }
[data-theme="dark"] .pagination .page-item.disabled .page-link { background: var(--bg); color: var(--text-light); }

[data-theme="dark"] .alert { border: none; color: var(--text); }
[data-theme="dark"] .alert-info { background: rgba(8, 145, 178, 0.15) !important; color: var(--info) !important; }
[data-theme="dark"] .alert-success { background: var(--success-bg) !important; color: var(--success) !important; }
[data-theme="dark"] .alert-warning { background: var(--warning-bg) !important; color: var(--warning) !important; }
[data-theme="dark"] .alert-danger { background: var(--danger-bg) !important; color: var(--danger) !important; }
[data-theme="dark"] .alert a { color: var(--primary-light) !important; }
[data-theme="dark"] .form-check-input { background-color: var(--bg) !important; border-color: var(--border) !important; }
[data-theme="dark"] .form-check-input:checked { background-color: var(--primary) !important; border-color: var(--primary) !important; }
[data-theme="dark"] .form-switch .form-check-input { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%2394a3b8'/%3e%3c/svg%3e") !important; }
[data-theme="dark"] .form-switch .form-check-input:checked { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e") !important; }
[data-theme="dark"] .form-text { color: var(--text-light); }
[data-theme="dark"] hr { border-color: var(--border); opacity: 0.3; }
[data-theme="dark"] .input-group-text { background: var(--bg); border-color: var(--border); color: var(--text-muted); }

[data-theme="dark"] .category-card { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .category-card:hover { border-color: var(--primary); }
[data-theme="dark"] .category-card .cat-icon { background: var(--primary-bg); }

/* Exam form category weights */
[data-theme="dark"] .cat-card { background: var(--bg) !important; border-color: var(--border) !important; color: var(--text); }
[data-theme="dark"] .mark-chip { background: var(--surface) !important; border-color: var(--border) !important; color: var(--text) !important; }
[data-theme="dark"] .mark-chip.filled { border-color: var(--success) !important; background: var(--success-bg) !important; color: var(--success) !important; }
[data-theme="dark"] .mark-chip.filled input.form-control { color: var(--success) !important; -webkit-text-fill-color: var(--success) !important; }
[data-theme="dark"] .mark-chip .avail-badge { color: var(--text-light) !important; }
[data-theme="dark"] .cat-subtotal { border-top-color: var(--border) !important; color: var(--text-muted); }

[data-theme="dark"] ::selection { background: rgba(143, 188, 181, 0.3); color: var(--primary-light); }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: var(--border); }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* Settings page */
[data-theme="dark"] .settings-nav { background: var(--bg) !important; border-color: var(--border) !important; }
[data-theme="dark"] .settings-nav .nav-link { color: var(--text-muted); }
[data-theme="dark"] .settings-nav .nav-link:hover,
[data-theme="dark"] .settings-nav .nav-link.active { color: var(--primary-light); background: var(--surface) !important; }
[data-theme="dark"] .settings-content { background: var(--surface) !important; border-color: var(--border) !important; }
[data-theme="dark"] .settings-panel { background: var(--surface); }
[data-theme="dark"] .section-desc { color: var(--text-muted); }
[data-theme="dark"] .guide-box { background: var(--bg) !important; color: var(--text-muted); }

/* Bootstrap overrides */
[data-theme="dark"] .list-group-item { background: var(--surface); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .breadcrumb-item.active { color: var(--text-muted); }
[data-theme="dark"] .nav-tabs { border-bottom-color: var(--border); }
[data-theme="dark"] .nav-tabs .nav-link { color: var(--text-muted); }
[data-theme="dark"] .nav-tabs .nav-link.active { color: var(--text); background: var(--surface); border-color: var(--border) var(--border) var(--surface); }
[data-theme="dark"] .accordion-item { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .accordion-button { background: var(--surface); color: var(--text); }
[data-theme="dark"] .accordion-button:not(.collapsed) { background: var(--primary-bg); color: var(--primary-light); }
[data-theme="dark"] code { color: var(--danger); background: rgba(220, 38, 38, 0.1); }
[data-theme="dark"] pre { background: var(--bg) !important; color: var(--text); border-color: var(--border); }
[data-theme="dark"] .text-secondary { color: var(--text-muted) !important; }
[data-theme="dark"] .fw-semibold { color: var(--text); }
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 { color: var(--text); }
[data-theme="dark"] .form-label { color: var(--text-muted); }
[data-theme="dark"] .border-danger { border-color: var(--danger) !important; }
[data-theme="dark"] .container-fluid { color: var(--text); }

[data-theme="dark"] .badge.bg-success { background: #3d6b52 !important; color: #e6f2ea !important; }
[data-theme="dark"] .badge.bg-info { background: #3e6a7d !important; color: #e3eff5 !important; }
[data-theme="dark"] .badge.bg-warning { background: #7d6537 !important; color: #f5ecd9 !important; }
[data-theme="dark"] .badge.bg-danger { background: #7d4444 !important; color: #f5e2e2 !important; }
[data-theme="dark"] .btn-success { background-color: #3d6b52 !important; border-color: #3d6b52 !important; color: #fff !important; }
[data-theme="dark"] .btn-success:hover { background-color: #315743 !important; border-color: #315743 !important; }
[data-theme="dark"] .btn-info { background-color: #3e6a7d !important; border-color: #3e6a7d !important; color: #fff !important; }
[data-theme="dark"] .btn-info:hover { background-color: #325666 !important; border-color: #325666 !important; }
[data-theme="dark"] .bg-success { background-color: #3d6b52 !important; }
[data-theme="dark"] .bg-info { background-color: #3e6a7d !important; }

/* Theme toggle button */
.theme-toggle {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition);
    display: flex;
    align-items: center;
}
.theme-toggle:hover { color: #fff; background: rgba(255,255,255,0.1); }

/* ===== Base ===== */
body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
}

a { color: var(--primary); transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

::selection {
    background: var(--primary-bg);
    color: var(--primary-dark);
}

/* ===== Navbar ===== */
.navbar {
    background: linear-gradient(135deg, #2b545f 0%, #346775 100%) !important;
    box-shadow: var(--shadow-md);
    padding: 0.5rem 1rem;
    border-bottom: none;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.4rem;
    background: linear-gradient(135deg, #74a29b, #8fbcb5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-wordmark {
    font-family: 'Playfair Display', serif;
    font-weight: 800;
}

.brand-wordmark .brand-accent {
    color: #e06060;
}

.brand-wordmark .brand-tail {
    opacity: 0.55;
    font-weight: 500;
}

.navbar .nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255,255,255,0.7) !important;
    padding: 0.6rem 0.85rem !important;
    border-radius: var(--radius);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
    color: #fff !important;
    background: rgba(255,255,255,0.1);
}

.navbar .nav-link i { font-size: 1rem; }

.navbar .badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.2em 0.5em;
    border-radius: 999px;
}

.navbar-toggler {
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.35rem 0.6rem;
}

/* ===== Cards ===== */
.card {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition);
    background: var(--surface);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-light);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.75rem 1.25rem;
    color: var(--text);
}

.card-body { padding: 1.25rem; }
.card-footer { background: var(--surface-hover); border-top: 1px solid var(--border-light); }

/* Stat cards on dashboard */
.stat-card {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card.primary::before { background: linear-gradient(90deg, #346775, #3f7d8c); }
[data-theme="dark"] .stat-card.primary::before { background: linear-gradient(90deg, #74a29b, #8fbcb5); }
.stat-card.success::before { background: linear-gradient(90deg, #059669, #34d399); }
.stat-card.info::before { background: linear-gradient(90deg, #0891b2, #22d3ee); }
.stat-card.warning::before { background: linear-gradient(90deg, #d97706, #fbbf24); }

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card.primary .stat-icon { background: var(--primary-bg); color: var(--primary); }
.stat-card.success .stat-icon { background: var(--success-bg); color: var(--success); }
.stat-card.info .stat-icon { background: var(--info-bg); color: var(--info); }
.stat-card.warning .stat-icon { background: var(--warning-bg); color: var(--warning); }

/* ===== Tables ===== */
.table {
    --bs-table-bg: transparent;
    font-size: 0.875rem;
}

.table th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-light);
    color: var(--text);
}

.table tbody tr {
    transition: background var(--transition);
}

.table-hover tbody tr:hover {
    background-color: var(--primary-bg) !important;
}

/* ===== Buttons ===== */
.btn {
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    padding: 0.45rem 1rem;
    transition: all var(--transition);
    letter-spacing: -0.01em;
}

.btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 0.5rem;
}

.btn-lg {
    padding: 0.65rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-outline-primary { color: var(--primary); border-color: var(--primary); }
.btn-outline-primary:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
[data-theme="dark"] .btn-outline-primary:hover { color: #0f1516 !important; }

.btn-outline-secondary { color: var(--text-muted); border-color: var(--border); }
.btn-outline-secondary:hover { background: var(--bg); border-color: var(--bg-alt); color: var(--text); }

.btn-group .btn { border-radius: 0; }
.btn-group .btn:first-child { border-radius: var(--radius) 0 0 var(--radius); }
.btn-group .btn:last-child, .btn-group form:last-child .btn { border-radius: 0 var(--radius) var(--radius) 0; }

/* ===== Badges ===== */
.badge {
    font-weight: 600;
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    padding: 0.35em 0.65em;
    border-radius: 999px;
}

.badge.bg-primary { background: var(--primary) !important; color: #fff !important; }
[data-theme="dark"] .badge.bg-primary { color: #0f1516 !important; }
.badge.bg-success { background: #4f8a68 !important; color: #fff !important; }
.badge.bg-warning { background: var(--warning) !important; color: #fff !important; }
.badge.bg-danger { background: var(--danger) !important; color: #fff !important; }
.badge.bg-info { background: #4f7f96 !important; color: #fff !important; }
.btn-success { background-color: #4f8a68; border-color: #4f8a68; color: #fff; }
.btn-success:hover { background-color: #41724f; border-color: #41724f; color: #fff; }
.btn-info { background-color: #4f7f96; border-color: #4f7f96; color: #fff; }
.btn-info:hover { background-color: #41697c; border-color: #41697c; color: #fff; }

/* ===== Forms ===== */
.form-control, .form-select {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem 0.85rem;
    font-size: 0.875rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    color: var(--text);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.form-label {
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--text);
    margin-bottom: 0.35rem;
}

/* ===== Breadcrumbs ===== */
.breadcrumb {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    background: none;
    padding: 0;
}

.breadcrumb-item a { color: var(--primary); text-decoration: none; }
.breadcrumb-item.active { color: var(--text-muted); }

/* ===== Page Headers ===== */
h3, .page-title {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text);
    letter-spacing: -0.02em;
}

h5 { font-weight: 600; letter-spacing: -0.01em; }
h6 { font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted); }

/* ===== Modals ===== */
.modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.modal-header { padding: 1.25rem 1.5rem 0.5rem; }
.modal-body { padding: 0.75rem 1.5rem; font-size: 0.9rem; line-height: 1.7; }
.modal-footer { padding: 0.5rem 1.5rem 1.25rem; }

.modal-title {
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-backdrop.show { opacity: 0.4; backdrop-filter: blur(4px); }

/* ===== Category Cards ===== */
.category-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.category-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

.category-card .card-body { padding: 1.25rem; }

.category-card h5 { color: var(--text); transition: color 0.15s ease; }
.category-card a:hover h5 { color: var(--primary); }

.category-card .cat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    background: var(--primary-bg);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

/* ===== Empty States ===== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    display: block;
}

.empty-state p {
    font-size: 0.95rem;
    max-width: 400px;
    margin: 0 auto;
}

/* ===== Login Page ===== */
.login-card {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.login-card .login-header {
    background: linear-gradient(135deg, #0f1516, #131b1c);
    padding: 2rem 1.5rem;
    text-align: center;
    color: white;
}

.login-card .login-header i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #74a29b, #8fbcb5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-card .login-header h4 {
    font-weight: 700;
    margin-top: 0.75rem;
    margin-bottom: 0.25rem;
}

.login-card .login-header p {
    opacity: 0.7;
    font-size: 0.9rem;
    margin: 0;
}

/* ===== Report Detail ===== */
.score-card {
    text-align: center;
    padding: 1rem;
    border-radius: var(--radius-lg);
    background: var(--bg);
}

.score-card .score-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

.score-card .score-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
    margin-top: 0.25rem;
}

/* ===== Answer Sheet ===== */
.answer-category-header {
    background: var(--bg);
    padding: 0.65rem 1rem;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
    border-bottom: 1px solid var(--border-light);
}

.answer-category-header:hover { background: var(--bg-alt); }

.answer-item { padding: 1rem 1.25rem; border-bottom: 1px solid var(--border-light); }
.answer-item:last-child { border-bottom: none; }
.answer-item:nth-child(odd) { background: rgba(241, 245, 249, 0.5); }

.option-box {
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem 0.85rem;
    font-size: 0.875rem;
    transition: all var(--transition);
}

.option-box.correct { border-color: var(--success); background: var(--success-bg); }
.option-box.wrong { border-color: var(--danger); background: var(--danger-bg); }

/* ===== Question Bank Table ===== */
.q-deactivated { opacity: 0.55; }
.q-deactivated:hover { opacity: 0.8; }

/* ===== Exam Taking ===== */
.exam-sidebar { background: linear-gradient(180deg, #f8fafc, #f1f5f9); }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-alt); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* ===== Utilities ===== */
.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
[data-theme="dark"] .text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hover-lift { transition: transform 0.3s ease, box-shadow 0.3s ease; }
.hover-lift:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

/* ===== Sticky Action Bar ===== */
.sticky-actions {
    position: sticky;
    top: 56px;
    z-index: 1020;
    background: var(--bg);
    padding: .6rem 0;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: .5rem;
    border-bottom: 1px solid var(--bg-alt);
}

/* ===== Modern Action Buttons ===== */
.table .btn-sm,
.d-flex.gap-1 .btn-sm {
    border-radius: .5rem;
    padding: .3rem .55rem;
    font-size: .8rem;
    border: none;
    transition: all var(--transition);
}
.btn-outline-secondary.btn-sm { background: var(--bg); color: var(--text-muted); }
.btn-outline-secondary.btn-sm:hover { background: var(--bg-alt); color: var(--text); }
.btn-outline-danger.btn-sm { background: var(--danger-bg); color: var(--danger); }
.btn-outline-danger.btn-sm:hover { background: var(--danger); color: #fff; }
.btn-outline-primary.btn-sm { background: var(--primary-bg); color: var(--primary); }
.btn-outline-primary.btn-sm:hover { background: var(--primary); color: #fff; }
[data-theme="dark"] .btn-outline-primary.btn-sm:hover { color: #0f1516 !important; }
.btn-outline-info.btn-sm { background: var(--info-bg); color: var(--info); }
.btn-outline-info.btn-sm:hover { background: var(--info); color: #fff; }
.btn-outline-warning.btn-sm { background: var(--warning-bg); color: var(--warning); }
.btn-outline-warning.btn-sm:hover { background: var(--warning); color: #fff; }
.btn-outline-success.btn-sm { background: var(--success-bg); color: var(--success); }
.btn-outline-success.btn-sm:hover { background: var(--success); color: #fff; }

/* ===== Modern components (UI modernization) ===== */
.page-head { display: flex; align-items: center; gap: 0.9rem; margin-bottom: 1.4rem; }
.page-head .ph-icon {
    width: 42px; height: 42px; border-radius: 12px;
    background: var(--primary-bg); color: var(--primary);
    display: flex; align-items: center; justify-content: center; font-size: 1.15rem; flex-shrink: 0;
}
.page-head h3, .page-head h2 { margin: 0; font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
.page-head .ph-sub { margin: 2px 0 0; font-size: 0.78rem; color: var(--text-light); }
.page-head .ph-actions { margin-left: auto; display: flex; gap: 0.5rem; }

.pill-row { display: flex; gap: 6px; margin-bottom: 1rem; flex-wrap: wrap; align-items: center; }
.filter-pill {
    padding: 6px 14px; border-radius: 999px; font-size: 0.76rem; font-weight: 600;
    color: var(--text-muted); background: var(--surface); border: 1px solid var(--border-light);
    cursor: pointer; text-decoration: none; transition: all var(--transition);
}
.filter-pill:hover { border-color: var(--border); color: var(--text); }
.filter-pill.active { background: var(--primary-bg); color: var(--primary); border-color: var(--primary); }
.pill-search {
    min-width: 180px; max-width: 280px; margin-left: auto;
    background: var(--surface); border: 1px solid var(--border-light);
    border-radius: 999px; padding: 6px 14px; color: var(--text); font-size: 0.78rem;
}
.pill-search:focus { outline: none; border-color: var(--primary); }

.table-modern td { padding: 0.8rem 0.9rem; vertical-align: middle; }
.table-modern th { padding: 0.6rem 0.9rem; }
.table-modern .row-sub { font-size: 0.72rem; color: var(--text-light); }
.td-num { text-align: right; font-variant-numeric: tabular-nums; }

.row-menu-btn {
    width: 28px; height: 28px; border-radius: 8px; border: none;
    background: transparent; color: var(--text-light); cursor: pointer; font-weight: 800; line-height: 1;
}
.row-menu-btn:hover { background: var(--surface-hover); color: var(--text); }

/* Dropdowns inside cards/scrollable tables get clipped by overflow — lift the clip while a menu is open */
.table-responsive:has(.dropdown-menu.show),
.card:has(.dropdown-menu.show) {
    overflow: visible;
}

.stat-card .stat-trend { font-size: 0.7rem; color: var(--success); margin-top: 4px; }
.stat-card .stat-trend.warn { color: var(--warning); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container-fluid { padding: 0.75rem; }
    .btn-group { flex-wrap: wrap; }
    h3, .page-title { font-size: 1.25rem; }
}