/* ========== Layout: left sidebar + main ========== */
:root {
    --sidebar-width: 240px;
    --sidebar-width-collapsed: 56px;
    --sidebar-bg: #1a1d23;
    --sidebar-text: rgba(255,255,255,0.85);
    --sidebar-active: #8B2332;
    --sidebar-hover: rgba(255,255,255,0.08);
    /* Brand: icon boxes + buttons use white bg, red icon/text, red outline */
    --brand-icon: #8B2332;
    --brand-icon-bg: #fff;
    --brand-icon-border: #8B2332;
    --bs-primary: #8B2332;
}

body.app-with-sidebar {
    display: flex;
    min-height: 100vh;
    background: #f5f6f8;
}

.app-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1030;
    transition: width 0.25s ease, min-width 0.25s ease;
}
.app-sidebar.sidebar-collapsed {
    width: var(--sidebar-width-collapsed);
    min-width: var(--sidebar-width-collapsed);
}
.app-sidebar.sidebar-collapsed .sidebar-dropdown-label,
.app-sidebar.sidebar-collapsed .sidebar-link span,
.app-sidebar.sidebar-collapsed .sidebar-section-label,
.app-sidebar.sidebar-collapsed .sidebar-user-name,
.app-sidebar.sidebar-collapsed .sidebar-user-role,
.app-sidebar.sidebar-collapsed .sidebar-semester-wrap,
.app-sidebar.sidebar-collapsed .sidebar-section-toggle .sidebar-section-label,
.app-sidebar.sidebar-collapsed .sidebar-dropdown-arrow { display: none !important; }
.app-sidebar.sidebar-collapsed .sidebar-section-collapsible { display: none !important; }
.app-sidebar.sidebar-collapsed .sidebar-lessons-wrap,
.app-sidebar.sidebar-collapsed .sidebar-utils-wrap { display: none !important; }
.app-sidebar.sidebar-collapsed .sidebar-toggle-btn i { transform: rotate(180deg); }
.app-sidebar.sidebar-collapsed .sidebar-brand { justify-content: center; }
.app-main { transition: margin-left 0.25s ease; }
.app-sidebar.sidebar-collapsed ~ .app-main { margin-left: var(--sidebar-width-collapsed); }

.sidebar-header {
    padding: 0.75rem 0.75rem 1rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-toggle-btn {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.7);
    padding: 0.35rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, background 0.15s;
}
.sidebar-toggle-btn:hover { color: #fff; background: var(--sidebar-hover); }
.sidebar-toggle-btn i { transition: transform 0.2s ease; font-size: 1rem; }

.sidebar-semester-wrap {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-nav .sidebar-semester-wrap {
    margin-top: 0.35rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar-dropdown-toggle {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--sidebar-hover);
    border: none;
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: none;
}
.sidebar-dropdown-toggle:hover { background: rgba(255,255,255,0.12); color: #fff; }
.sidebar-dropdown-arrow { font-size: 0.75rem; transition: transform 0.2s ease; }
.sidebar-dropdown-toggle[aria-expanded="true"] .sidebar-dropdown-arrow { transform: rotate(180deg); }
.sidebar-dropdown-inner { padding: 0.25rem 0 0 0.5rem; }
.sidebar-dropdown-item {
    display: block;
    padding: 0.35rem 0.75rem;
    color: var(--sidebar-text);
    font-size: 0.8rem;
    text-decoration: none;
    border-radius: 6px;
    margin-bottom: 2px;
}
.sidebar-dropdown-item:hover { background: var(--sidebar-hover); color: #fff; }
.sidebar-dropdown-item.active { background: rgba(139, 35, 50, 0.35); color: #fff; }

.sidebar-section-collapsible { margin-top: 0.25rem; }
.sidebar-section-toggle {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.5);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.75rem 1rem 0.35rem;
    cursor: pointer;
    text-align: left;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar-section-toggle:hover { color: var(--sidebar-text); }
.sidebar-section-arrow { font-size: 0.65rem; transition: transform 0.2s ease; }
.sidebar-section-toggle[aria-expanded="true"] .sidebar-section-arrow { transform: rotate(180deg); }
.sidebar-section-toggle[aria-expanded="false"] .sidebar-section-arrow { transform: rotate(0); }
.sidebar-section-collapsible .sidebar-section-label { border: none; margin: 0; padding: 0; }

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
}

/* Full horizontal logo (emblem + "Πανεπιστήμιο Πειραιώς / University of Piraeus") */
.sidebar-brand--full {
    padding: 0.25rem 0;
}
.sidebar-brand-full-logo {
    height: 56px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    object-position: left center;
    display: block;
}
.sidebar-brand-collapsed-logo,
.sidebar-logo-collapsed { display: none !important; }
.app-sidebar.sidebar-collapsed .sidebar-brand-full-logo { height: 48px; }

.sidebar-brand-icon {
    width: 36px;
    height: 36px;
    background: var(--sidebar-active);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    letter-spacing: -0.02em;
    overflow: hidden;
}
.sidebar-brand-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    min-height: 0;
}

.sidebar-section-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.5);
    padding: 0.75rem 1rem 0.35rem;
    margin-top: 0.5rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-nav .sidebar-section-label:first-of-type {
    margin-top: 0.25rem;
    border-top: none;
    padding-top: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: background 0.15s, color 0.15s;
}

.sidebar-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.sidebar-link.active {
    background: rgba(139, 35, 50, 0.35);
    color: #fff;
}

.sidebar-link i {
    font-size: 1.15rem;
    opacity: 0.9;
}

.sidebar-link-sub {
    padding-left: 1.5rem;
    font-size: 0.875rem;
}

.sidebar-link-sub i {
    font-size: 1rem;
}

/* Compact lessons list (clickable, scrollable – more fit) */
.sidebar-lessons-wrap {
    margin-top: 0.35rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar-lessons-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.5);
    padding: 0 0.75rem 0.35rem;
}
.sidebar-lessons-semester-badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: rgba(255,255,255,0.75);
    background: rgba(255,255,255,0.12);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.sidebar-lessons-empty {
    padding: 0.75rem;
    text-align: center;
}
.sidebar-lessons-empty-text {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.6);
    margin: 0 0 0.5rem 0;
    line-height: 1.35;
}
.sidebar-lessons-empty-link {
    font-size: 0.75rem;
    color: #8B2332;
    background: rgba(139, 35, 50, 0.2);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    text-decoration: none;
    display: inline-block;
    transition: background 0.15s, color 0.15s;
}
.sidebar-lessons-empty-link:hover {
    background: rgba(139, 35, 50, 0.35);
    color: #fff;
}
.sidebar-lessons-list {
    max-height: 200px;
    overflow-y: auto;
    padding: 0 0.25rem;
}
.sidebar-lesson-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.5rem;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.8rem;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}
.sidebar-lesson-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}
.sidebar-lesson-link.active {
    background: rgba(139, 35, 50, 0.35);
    color: #fff;
}
.sidebar-lesson-link i {
    font-size: 0.85rem;
    flex-shrink: 0;
    opacity: 0.9;
}
.sidebar-lesson-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Compact utils (Υλικό, Ανακοινώσεις, …) for current lesson */
.sidebar-utils-wrap {
    margin-top: 0.25rem;
    padding-top: 0.35rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar-utils-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.5);
    padding: 0 0.75rem 0.25rem;
}
.sidebar-utils-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}
.sidebar-utils-list .sidebar-link-sub {
    padding: 0.35rem 0.75rem 0.35rem 1.25rem;
    font-size: 0.8rem;
}
.sidebar-utils-list .sidebar-link-sub i {
    font-size: 0.9rem;
}

.sidebar-footer {
    padding: 1rem 0.75rem;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-user {
    padding: 0.5rem 1rem;
    margin-bottom: 0.25rem;
}

.sidebar-user-name {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
}

.sidebar-user-role {
    font-size: 0.75rem;
    opacity: 0.7;
}

.sidebar-link-logout {
    color: rgba(255,255,255,0.6);
}

.sidebar-link-logout:hover {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.app-main--dashboard-banner {
    position: relative;
}
.app-main--dashboard-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('../images/unipi-banner.png') center top / cover no-repeat;
    background-attachment: scroll;
    opacity: 0.7;
    z-index: 0;
}
.app-main--dashboard-banner > * { position: relative; z-index: 1; }
@media (min-width: 992px) {
    .app-main--dashboard-banner::before { background-attachment: fixed; }
}

.app-main-inner {
    flex: 1;
    padding: 1.5rem 2rem;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.flash-messages {
    margin-bottom: 1rem;
}

/* Auth pages (login/register): banner background + centered layout */
body.page-auth-banner {
    min-height: 100vh;
    position: relative;
}
body.page-auth-banner::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('../images/unipi-banner.png') center center / cover no-repeat;
    opacity: 0.7;
    z-index: 0;
}
body.page-auth-banner .app-main {
    margin-left: 0;
    min-height: 100vh;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 0;
}
body.page-auth-banner #app-content-wrap {
    width: 100%;
}
body.page-auth-banner .card {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(229, 231, 235, 0.8);
}
.login-logo {
    object-fit: contain;
}

/* ========== Page header & content ========== */
.page-header {
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: #1a1d23;
}

.page-subtitle {
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: 0;
}

.role-badge {
    background: rgba(139, 35, 50, 0.12);
    color: #8B2332;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    color: #1a1d23;
}

.section-action {
    font-size: 0.85rem;
    color: #8B2332;
    text-decoration: none;
    font-weight: 500;
}

.section-action:hover {
    color: #6b1c28;
}

/* Shared placeholder/card style for dashboard sections (thin brand red outline) */
.dashboard-semester-wrap,
.dashboard-main-wrap {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(139, 35, 50, 0.35);
    border-radius: 10px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.dashboard-semester-wrap { padding: 0.75rem 1rem; }
.dashboard-main-wrap { padding: 1.25rem 1.5rem; }

.dashboard-semester-bar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    padding: 0;
}
.dashboard-semester-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: #6b7280;
    margin: 0;
}
.dashboard-semester-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
}
.dashboard-semester-link {
    font-size: 0.8rem;
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    background: #f3f4f6;
    color: #4b5563;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}
.dashboard-semester-link:hover { background: #e5e7eb; color: #1a1d23; }
.dashboard-semester-link.active {
    background: rgba(139, 35, 50, 0.12);
    color: #8B2332;
    font-weight: 600;
}

/* AJAX content loading state */
#app-content.app-content-loading {
    opacity: 0.7;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

/* ========== Metric cards ========== */
.metric-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: #fff;
    border-radius: 12px;
    border: 1px solid rgba(139, 35, 50, 0.35);
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.metric-card:hover {
    border-color: rgba(139, 35, 50, 0.5);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.metric-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    flex-shrink: 0;
    background: var(--brand-icon-bg) !important;
    color: var(--brand-icon) !important;
    border: 2px solid var(--brand-icon-border);
}

/* Card header icon: branded look (white bg, red icon, red outline) */
.card-header-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 8px;
    flex-shrink: 0;
    background: var(--brand-icon-bg) !important;
    color: var(--brand-icon) !important;
    border: 2px solid var(--brand-icon-border);
}
.card-header-icon i { font-size: 1.1rem; }

/* Generic branded icon box (use on any page for consistency) */
.icon-box-brand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    flex-shrink: 0;
    background: var(--brand-icon-bg) !important;
    color: var(--brand-icon) !important;
    border: 2px solid var(--brand-icon-border);
}
.icon-box-brand i { font-size: 1.15rem; }

/* ========== Brand buttons (red bg, white text) ========== */
.btn-primary {
    background-color: var(--brand-icon) !important;
    color: #fff !important;
    border: 2px solid var(--brand-icon-border);
}
.btn-primary:hover {
    background-color: #6b1c28 !important;
    color: #fff !important;
    border-color: #6b1c28;
}
.btn-outline-primary {
    background-color: transparent;
    color: var(--brand-icon);
    border: 2px solid var(--brand-icon-border);
}
.btn-outline-primary:hover {
    background-color: var(--brand-icon);
    color: #fff !important;
    border-color: var(--brand-icon);
}

/* Primary utilities (badges, labels): use brand red */
.text-primary { color: var(--brand-icon) !important; }
.bg-primary { background-color: var(--brand-icon) !important; }
.bg-primary.bg-opacity-10 { background-color: rgba(139, 35, 50, 0.1) !important; }

.metric-body {
    min-width: 0;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: #1a1d23;
}

.metric-label {
    font-size: 0.8rem;
    color: #6b7280;
    margin-top: 0.15rem;
}

/* ========== Course card compact (instructor dashboard) ========== */
.course-card-compact .course-card-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}
.course-stat-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.7rem;
    color: #4b5563;
    background: #f3f4f6;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
}
.course-stat-pill i {
    font-size: 0.75rem;
    opacity: 0.85;
}
.course-stat-pill-warn {
    background: #fefce8;
    color: #ca8a04;
}
.course-avg-badge {
    background: rgba(139, 35, 50, 0.08);
    color: #8B2332;
    padding: 0.4rem 0.6rem;
    border-radius: 8px;
    min-width: 48px;
}
.course-avg-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.2;
}
.course-avg-label {
    font-size: 0.6rem;
    opacity: 0.9;
}
.course-card-link {
    cursor: pointer;
    transition: opacity 0.15s ease;
}
.course-card-link:hover .card {
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.12) !important;
}
.course-card-link:hover {
    opacity: 0.95;
}
.dashboard-main-wrap .card.course-card-compact {
    border: 1px solid rgba(139, 35, 50, 0.35) !important;
}

/* ========== Dashboard calendar ========== */
.dashboard-calendar-card {
    border: 1px solid rgba(139, 35, 50, 0.35);
}
.dashboard-calendar-header {
    margin-bottom: 0.5rem;
}
.dashboard-calendar-month {
    font-size: 0.9rem;
    font-weight: 600;
    color: #1a1d23;
}
.dashboard-calendar-grid {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.dashboard-calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    font-size: 0.6rem;
    font-weight: 600;
    color: #6b7280;
    text-align: center;
}
.dashboard-calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}
.dashboard-calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #374151;
    background: #f9fafb;
    border-radius: 6px;
    position: relative;
    overflow: visible;
}
.dashboard-calendar-day-num {
    line-height: 1;
}
.dashboard-calendar-day-empty {
    background: transparent;
}
.dashboard-calendar-day-busy {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    color: #8B2332;
    font-weight: 600;
    border: 1px solid rgba(139, 35, 50, 0.25);
    box-shadow: 0 0 0 1px rgba(139, 35, 50, 0.08);
}
.dashboard-calendar-busy-indicator {
    position: absolute;
    bottom: 1px;
    right: 1px;
    min-width: 14px;
    height: 14px;
    padding: 0 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.55rem;
    font-weight: 700;
    color: #fff;
    background: #8B2332;
    border-radius: 10px;
    line-height: 1;
}
.dashboard-calendar-dots {
    position: absolute;
    bottom: 3px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    pointer-events: none;
}
.dashboard-calendar-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.08);
}
.dashboard-calendar-dot-event {
    background: #8B2332;
}
.dashboard-calendar-dot-assignment {
    background: #ca8a04;
}
.dashboard-calendar-list {
    max-height: 200px;
    overflow-y: auto;
}
.dashboard-calendar-item {
    border-bottom: 1px solid #f3f4f6;
}
.dashboard-calendar-item:last-child {
    border-bottom: 0;
}
.dashboard-calendar-item-type {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    flex-shrink: 0;
}
.dashboard-calendar-type-event {
    background: rgba(139, 35, 50, 0.12);
    color: #8B2332;
}
.dashboard-calendar-type-assignment {
    background: #fefce8;
    color: #ca8a04;
}

/* ========== Dashboard overview chart (bar graph) ========== */
.dashboard-overview-chart {
    background: #fff;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.dashboard-overview-chart .chart-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #6b7280;
    margin-bottom: 1rem;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    min-height: 140px;
    padding: 0.5rem 0;
}

.chart-bar-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.chart-bar {
    width: 100%;
    max-width: 64px;
    min-height: 24px;
    border-radius: 8px 8px 0 0;
    transition: height 0.4s ease;
}

.chart-bar-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: #374151;
    text-align: center;
    line-height: 1.2;
}

.chart-bar-value {
    font-size: 1rem;
    font-weight: 700;
    color: #1a1d23;
}

/* ========== Mini stats (course cards) ========== */
.mini-stat {
    text-align: center;
    padding: 0.4rem 0.25rem;
    background: #f9fafb;
    border-radius: 8px;
}

.mini-stat-value {
    display: block;
    font-weight: 700;
    font-size: 1rem;
    color: #1a1d23;
}

.mini-stat-label {
    font-size: 0.65rem;
    color: #6b7280;
}

.mini-stat-warning .mini-stat-value {
    color: #ca8a04;
}

/* ========== Quick links ========== */
.quick-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    color: #4b5563;
    background: #f3f4f6;
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

.quick-link:hover {
    background: #e5e7eb;
    color: #1a1d23;
}

.quick-link-accent {
    background: rgba(139, 35, 50, 0.1);
    color: #8B2332;
}

.quick-link-accent:hover {
    background: rgba(139, 35, 50, 0.18);
    color: #6b1c28;
}

/* ========== Sidebar content items (dashboard right column) ========== */
.sidebar-item:hover {
    background: #f9fafb;
}

/* ========== Responsive: collapse sidebar on small screens ========== */
@media (max-width: 991.98px) {
    .app-sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
    }
    body.sidebar-open .app-sidebar {
        transform: translateX(0);
    }
    .app-main {
        margin-left: 0;
    }
    .app-main-inner {
        padding: 1rem;
    }
}

/* Navbar shadow on scroll (when/if top navbar is used) */
.navbar.scrolled {
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* ========================================================================
   ACCESSIBILITY FEATURES
   Modern a11y toolbar, skip-to-content, focus styles, high contrast,
   dyslexia font, grayscale, reading guide, large cursor, reduced motion.
   ======================================================================== */

/* --- Skip to content link --- */
.skip-to-content {
    position: fixed;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100000;
    background: #8B2332;
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 10px 10px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
    transition: top 0.2s ease;
}
.skip-to-content:focus {
    top: 0;
    outline: 3px solid #ca8a04;
    outline-offset: 2px;
    color: #fff;
}

/* --- Accessibility Toolbar --- */
.a11y-toolbar {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 10000;
    font-family: inherit;
}

.a11y-toolbar-toggle {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: #8B2332;
    color: #fff;
    border: 3px solid #fff;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.a11y-toolbar-toggle:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 24px rgba(0,0,0,0.3);
}
.a11y-toolbar-toggle:focus-visible {
    outline: 3px solid #ca8a04;
    outline-offset: 3px;
}

.a11y-panel {
    position: absolute;
    bottom: calc(100% + 0.75rem);
    right: 0;
    width: 280px;
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18), 0 0 0 1px rgba(0,0,0,0.06);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.95);
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}
.a11y-panel.a11y-panel--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.a11y-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1rem;
    background: #8B2332;
    color: #fff;
}
.a11y-panel-title {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}
.a11y-panel-close {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.85);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.2rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}
.a11y-panel-close:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}
.a11y-panel-close:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.a11y-panel-body {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    max-height: 420px;
    overflow-y: auto;
}

.a11y-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.2rem 0;
}
.a11y-group-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: #374151;
}
.a11y-font-controls {
    display: flex;
    gap: 0.25rem;
}
.a11y-font-controls .a11y-btn {
    width: 36px;
    height: 32px;
    padding: 0;
    font-size: 0.82rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.a11y-btn {
    background: #f3f4f6;
    color: #374151;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.a11y-btn:hover {
    background: #e5e7eb;
    color: #1a1d23;
}
.a11y-btn:focus-visible {
    outline: 2px solid #8B2332;
    outline-offset: 2px;
}
.a11y-btn.active,
.a11y-btn[aria-pressed="true"] {
    background: #8B2332;
    color: #fff;
    border-color: #8B2332;
}

.a11y-btn-full {
    width: 100%;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.a11y-btn-full i {
    font-size: 1rem;
    width: 1.25rem;
    text-align: center;
    flex-shrink: 0;
}

.a11y-divider {
    margin: 0.35rem 0;
    border-color: #e5e7eb;
    opacity: 0.5;
}

.a11y-btn-reset {
    background: transparent;
    color: #6b7280;
    border: 1px dashed #d1d5db;
}
.a11y-btn-reset:hover {
    background: #fef2f2;
    color: #8B2332;
    border-color: #8B2332;
}

/* --- Focus visible styles (keyboard navigation) --- */
*:focus-visible {
    outline: 3px solid #8B2332;
    outline-offset: 2px;
}
.sidebar-link:focus-visible {
    outline-color: #fff;
    background: var(--sidebar-hover);
}
.sidebar-lesson-link:focus-visible,
.sidebar-dropdown-item:focus-visible {
    outline-color: #fff;
}
.btn:focus-visible,
.form-control:focus-visible,
.form-select:focus-visible {
    outline: 3px solid #8B2332;
    outline-offset: 2px;
    box-shadow: none;
}

/* --- Reading guide overlay --- */
.a11y-reading-guide {
    display: none;
    position: fixed;
    left: 0;
    width: 100%;
    height: 12px;
    background: rgba(139, 35, 50, 0.15);
    border-top: 2px solid rgba(139, 35, 50, 0.4);
    border-bottom: 2px solid rgba(139, 35, 50, 0.4);
    pointer-events: none;
    z-index: 99999;
    transition: top 0.05s linear;
}
body.a11y-reading-guide-on .a11y-reading-guide {
    display: block;
}

/* --- High contrast mode --- */
body.a11y-high-contrast {
    background: #000 !important;
    color: #fff !important;
}
body.a11y-high-contrast .app-main,
body.a11y-high-contrast .app-main-inner,
body.a11y-high-contrast .card,
body.a11y-high-contrast .metric-card,
body.a11y-high-contrast .dashboard-semester-wrap,
body.a11y-high-contrast .dashboard-main-wrap,
body.a11y-high-contrast .dashboard-overview-chart,
body.a11y-high-contrast .table {
    background: #000 !important;
    color: #fff !important;
    border-color: #fff !important;
}
body.a11y-high-contrast a {
    color: #ffd700 !important;
}
body.a11y-high-contrast a:hover {
    color: #ffa500 !important;
}
body.a11y-high-contrast .sidebar-link,
body.a11y-high-contrast .sidebar-lesson-link,
body.a11y-high-contrast .sidebar-dropdown-item {
    color: #fff !important;
}
body.a11y-high-contrast .sidebar-link.active,
body.a11y-high-contrast .sidebar-lesson-link.active,
body.a11y-high-contrast .sidebar-dropdown-item.active {
    background: #ffd700 !important;
    color: #000 !important;
}
body.a11y-high-contrast .btn-primary {
    background: #ffd700 !important;
    color: #000 !important;
    border-color: #ffd700 !important;
}
body.a11y-high-contrast .btn-outline-primary {
    border-color: #ffd700 !important;
    color: #ffd700 !important;
}
body.a11y-high-contrast .page-title,
body.a11y-high-contrast .section-title,
body.a11y-high-contrast .metric-value,
body.a11y-high-contrast h1, body.a11y-high-contrast h2,
body.a11y-high-contrast h3, body.a11y-high-contrast h4,
body.a11y-high-contrast h5, body.a11y-high-contrast h6 {
    color: #fff !important;
}
body.a11y-high-contrast .page-subtitle,
body.a11y-high-contrast .metric-label,
body.a11y-high-contrast .text-muted {
    color: #ccc !important;
}
body.a11y-high-contrast .form-control,
body.a11y-high-contrast .form-select {
    background: #1a1a1a !important;
    color: #fff !important;
    border-color: #fff !important;
}
body.a11y-high-contrast .alert {
    border-color: #fff !important;
    color: #fff !important;
    background: #333 !important;
}
body.a11y-high-contrast .a11y-panel {
    background: #1a1a1a;
    border: 2px solid #fff;
}
body.a11y-high-contrast .a11y-btn {
    background: #333;
    color: #fff;
    border-color: #666;
}
body.a11y-high-contrast .a11y-btn:hover {
    background: #555;
    color: #fff;
}
body.a11y-high-contrast .a11y-btn.active,
body.a11y-high-contrast .a11y-btn[aria-pressed="true"] {
    background: #ffd700;
    color: #000;
    border-color: #ffd700;
}
body.a11y-high-contrast .a11y-group-label {
    color: #ccc;
}
body.a11y-high-contrast .table th,
body.a11y-high-contrast .table td {
    border-color: #555 !important;
    color: #fff !important;
}
body.a11y-high-contrast img {
    filter: brightness(1.1) contrast(1.1);
}

/* --- Dyslexia-friendly font --- */
@font-face {
    font-family: 'OpenDyslexic';
    font-style: normal;
    font-weight: 400;
    src: url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/woff/OpenDyslexic-Regular.woff') format('woff');
    font-display: swap;
}
@font-face {
    font-family: 'OpenDyslexic';
    font-style: normal;
    font-weight: 700;
    src: url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/woff/OpenDyslexic-Bold.woff') format('woff');
    font-display: swap;
}
body.a11y-dyslexia-font,
body.a11y-dyslexia-font * {
    font-family: 'OpenDyslexic', 'Comic Sans MS', sans-serif !important;
    letter-spacing: 0.05em !important;
    word-spacing: 0.15em !important;
}
body.a11y-dyslexia-font p,
body.a11y-dyslexia-font li,
body.a11y-dyslexia-font td,
body.a11y-dyslexia-font th,
body.a11y-dyslexia-font span,
body.a11y-dyslexia-font div {
    line-height: 1.8 !important;
}

/* --- Grayscale mode --- */
body.a11y-grayscale {
    filter: grayscale(100%);
}
body.a11y-grayscale .a11y-toolbar {
    filter: grayscale(0%);
}

/* --- Underline links --- */
body.a11y-underline-links a {
    text-decoration: underline !important;
    text-underline-offset: 3px;
}
body.a11y-underline-links .sidebar-link,
body.a11y-underline-links .sidebar-lesson-link {
    text-decoration: none !important;
}

/* --- Large cursor --- */
body.a11y-large-cursor,
body.a11y-large-cursor * {
    cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='48' viewBox='0 0 40 48'%3E%3Cpath d='M5 3L5 40L13 32L21 45L27 42L19 29L30 29Z' fill='black' stroke='white' stroke-width='2'/%3E%3C/svg%3E") 5 3, auto !important;
}
body.a11y-large-cursor a,
body.a11y-large-cursor button,
body.a11y-large-cursor [role="button"],
body.a11y-large-cursor input[type="submit"],
body.a11y-large-cursor .btn {
    cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='48' viewBox='0 0 40 48'%3E%3Cpath d='M15 3C15 14 15 14 15 14C8 14 8 14 8 14C8 18 12 22 20 22C28 22 32 18 32 14L25 14L25 3C25 1 23 0 20 0C17 0 15 1 15 3Z' fill='black' stroke='white' stroke-width='2'/%3E%3C/svg%3E") 20 0, pointer !important;
}

/* --- Font size scaling --- */
body.a11y-font-1 { font-size: 112.5% !important; }
body.a11y-font-2 { font-size: 125% !important; }
body.a11y-font-3 { font-size: 137.5% !important; }
body.a11y-font-4 { font-size: 150% !important; }
body.a11y-font--1 { font-size: 87.5% !important; }
body.a11y-font--2 { font-size: 75% !important; }

/* --- Reduced motion --- */
body.a11y-reduce-motion,
body.a11y-reduce-motion *,
body.a11y-reduce-motion *::before,
body.a11y-reduce-motion *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
}

/* --- Respect prefers-reduced-motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* --- Screen reader only utility --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Mobile responsiveness for a11y toolbar --- */
@media (max-width: 575.98px) {
    .a11y-toolbar {
        bottom: 1rem;
        right: 1rem;
    }
    .a11y-toolbar-toggle {
        width: 46px;
        height: 46px;
        font-size: 1.3rem;
    }
    .a11y-panel {
        width: calc(100vw - 2rem);
        right: -0.5rem;
    }
}