/* ==========================================================================
   365 Architect — AI Security Portal Design System
   Mirrors the main site's [data-theme] system (src/wwwroot/css/site.css) so
   the course portal follows whichever theme (light/dark) is active there —
   same localStorage key, same Inter/JetBrains Mono type, same accent logic.
   Modernized 2026 — softer glass, pill-segmented controls, ring-gauge
   scorecard, consistent type scale, WCAG 2.2 AA touch targets.
   ========================================================================== */

@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400; font-display: swap; src: url('/fonts/inter-latin-400.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 500; font-display: swap; src: url('/fonts/inter-latin-500.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 600; font-display: swap; src: url('/fonts/inter-latin-600.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 700; font-display: swap; src: url('/fonts/inter-latin-700.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('/fonts/jetbrains-mono-latin-400.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('/fonts/jetbrains-mono-latin-500.woff2') format('woff2'); }

:root {
    --bg-primary: #01002a;
    --bg-secondary: #080730;
    --accent: #1affff;
    --accent-dim: #00cccc;
    --card-bg: color-mix(in srgb, var(--bg-secondary) 60%, transparent);
    --border-color: color-mix(in srgb, var(--accent) 12%, transparent);
    --border-color-glow: color-mix(in srgb, var(--accent) 40%, transparent);
    --text-primary: #f0eef8;
    --text-secondary: #a8a4c0;
    --text-highlight: #ffffff;
    --success: #4cff88;
    --error: #ff4466;
    --warning: #ffb020;
    --sidebar-width: 320px;
    --header-height: 80px;
    --transition-speed: 0.3s;
    /* Modernization tokens */
    --alert-warning-text: #ffd091;
    --alert-info-bg: color-mix(in srgb, var(--accent) 5%, transparent);
    --alert-info-border: color-mix(in srgb, var(--accent) 30%, transparent);
    --focus-ring: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
    --shadow-card: 0 4px 24px 0 rgba(0, 0, 0, 0.15);
    --text-muted: #8a88a8;
    --nav-item-min-height: 44px;
    --btn-min-height: 44px;
}

/* Light theme — matches site.css's [data-theme="light"] palette */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --accent: #0891b2;
    --accent-dim: #0e7490;
    --card-bg: #ffffff;
    --border-color: rgba(0, 0, 20, 0.1);
    --border-color-glow: rgba(8, 145, 178, 0.35);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-highlight: #0f172a;
    --success: #059669;
    --error: #dc2626;
    --warning: #d97706;
    --alert-warning-text: #78350f;
    --alert-info-bg: color-mix(in srgb, var(--accent) 5%, transparent);
    --alert-info-border: color-mix(in srgb, var(--accent) 30%, transparent);
    --focus-ring: 0 0 0 3px rgba(8, 145, 178, 0.3);
    --shadow-card: 0 4px 24px 0 rgba(0, 0, 20, 0.06);
}

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

body {
    font-family: 'Inter', -apple-system, "Segoe UI", system-ui, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ─── Focus States (accessibility) ─── */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
    box-shadow: var(--focus-ring);
}
button:focus-visible,
.btn:focus-visible {
    border-radius: 6px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* App Container Layout */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 100;
    transition: transform var(--transition-speed) ease;
}

.sidebar-header {
    padding: 28px 24px 24px;
    border-bottom: 1px solid var(--border-color);
}

.brand-logo {
    font-family: 'Inter', sans-serif;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
}

.logo-text-365 {
    color: var(--accent);
    text-shadow: 0 0 8px color-mix(in srgb, var(--accent) 25%, transparent);
}

.logo-text-arch {
    color: var(--text-highlight);
}

.brand-subtitle {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 600;
}

.site-nav {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.site-nav-link {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    text-decoration: none;
    padding: 3px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: color .15s, border-color .15s;
}

.site-nav-link:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
}

.nav-section-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent);
    margin: 20px 8px 8px 8px;
    padding-bottom: 4px;
    border-bottom: 1px dashed var(--border-color);
}

.nav-section-title:first-of-type {
    margin-top: 0;
}

.nav-list {
    list-style: none;
}

.nav-category-header {
    padding: 16px 12px 6px 12px;
    margin-top: 4px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.10em;
    text-transform: uppercase;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.75;
}
.nav-category-header:first-child {
    padding-top: 8px;
    border-top: none;
}

.nav-item-container {
    list-style: none;
}

.nav-item {
    padding: 12px 12px;
    min-height: var(--nav-item-min-height);
    margin: 2px 0;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    background: transparent;
    border: none;
    text-align: left;
    font-family: inherit;
    transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
    position: relative;
}

.nav-item i {
    font-size: 12px;
    color: color-mix(in srgb, var(--accent) 40%, transparent);
    transition: color 0.2s ease;
}

.nav-item:hover {
    color: var(--text-highlight);
    background-color: color-mix(in srgb, var(--accent) 5%, transparent);
    transform: translateX(2px);
}

.nav-item:hover i {
    color: var(--accent);
}

.nav-item.active {
    color: var(--text-highlight);
    background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 10%, transparent) 0%, color-mix(in srgb, var(--accent) 1%, transparent) 100%);
    border-left: 3px solid var(--accent);
    font-weight: 600;
}

.nav-item.active i {
    color: var(--accent);
}

/* Completion marker for previously-visited modules */
.nav-item.completed {
    position: relative;
}
.nav-item.completed::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 12px;
    font-size: 10px;
    color: var(--success);
    opacity: 0.7;
}

.nav-item-locked {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    color: var(--text-muted);
    font-size: 13px;
    cursor: not-allowed;
    opacity: 0.5;
    position: relative;
}

.nav-item-locked i {
    font-size: 12px;
    color: var(--text-muted);
}

.free-badge {
    display: inline-block;
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    color: var(--accent);
    font-size: 9px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 1px 7px;
    border-radius: 4px;
    margin-left: 6px;
}

.sidebar-upgrade-banner {
    background: color-mix(in srgb, var(--warning) 14%, transparent);
    border: 1px solid color-mix(in srgb, var(--warning) 45%, transparent);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-primary);
}

.sidebar-upgrade-banner strong {
    display: block;
    font-size: 13px;
    margin-bottom: 4px;
    color: var(--warning);
}

.sidebar-upgrade-banner p {
    margin: 0 0 8px 0;
    color: var(--text-secondary);
    font-size: 11px;
}

.contact-prompt {
    display: inline-block;
    background: var(--warning);
    color: #000;
    font-size: 11px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 6px;
    text-decoration: none;
    text-align: center;
    transition: opacity 0.15s;
}

.contact-prompt:hover {
    opacity: 0.85;
}

.preview-banner-top {
    background: linear-gradient(135deg, color-mix(in srgb, var(--warning) 20%, transparent), color-mix(in srgb, #f87171 12%, transparent));
    border-bottom: 2px solid var(--warning);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.preview-banner-top-content {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.preview-banner-top-content i {
    font-size: 20px;
    color: var(--warning);
    flex-shrink: 0;
}

.preview-banner-top-content strong {
    color: var(--warning);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.preview-banner-top-content span {
    color: var(--text-secondary);
}

.preview-banner-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 22px;
    padding: 4px 10px;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
    flex-shrink: 0;
}

.preview-banner-close:hover {
    color: var(--text-primary);
    background: color-mix(in srgb, var(--warning) 15%, transparent);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
    background-color: color-mix(in srgb, var(--bg-primary) 40%, transparent);
}

.contact-link {
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.2s ease;
}

.contact-link:hover {
    color: var(--accent);
}

/* Auth status (Azure AD B2C placeholder — hidden until enabled, see /js/auth.js) */
.auth-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}
.auth-status .auth-form { display: inline-flex; }
.auth-status .auth-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    font-family: 'Inter', sans-serif;
    padding: 0;
    text-decoration: none;
}
.auth-status .auth-link:hover { color: var(--accent); }
.auth-status .auth-name { color: var(--text-highlight); font-weight: 500; }

/* Main Content Layout */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header Styling */
.content-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: color-mix(in srgb, var(--bg-secondary) 40%, transparent);
    backdrop-filter: blur(8px);
    z-index: 90;
    flex-shrink: 0;
}

.sidebar-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 12px;
    min-height: var(--btn-min-height);
    border-radius: 6px;
    cursor: pointer;
    display: none;
    transition: all 0.2s ease;
}

.sidebar-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.module-title-container {
    display: flex;
    flex-direction: column;
    max-width: 60%;
}

.module-title-container h1 {
    font-family: 'Inter', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-highlight);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.module-badge {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    margin-top: 2px;
}

/* View Selector Tabs — pill-segmented control */
.view-selector {
    display: flex;
    background-color: color-mix(in srgb, var(--bg-primary) 50%, transparent);
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    gap: 2px;
}

.view-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 10px 16px;
    min-height: var(--btn-min-height);
    font-size: 14px;
    font-weight: 600;
    border-radius: 7px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.view-btn:hover {
    color: var(--text-highlight);
}

.view-btn.active {
    background-color: var(--bg-secondary);
    color: var(--accent);
    border: 1px solid var(--border-color);
    box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 8%, transparent);
}

/* Viewer Panel Contents */
.viewer-panel {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    background: radial-gradient(circle at top right, color-mix(in srgb, var(--accent) 2%, transparent), transparent 60%);
}

.view-section {
    display: none;
    animation: fadeIn 0.35s ease;
}

.view-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards — softened glassmorphism */
.card {
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 24px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.glass-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
}

.glass-card:hover {
    box-shadow: 0 6px 28px 0 rgba(0, 0, 0, 0.18);
}

/* Metadata Grid */
.metadata-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
    padding: 20px;
    background-color: color-mix(in srgb, var(--bg-primary) 30%, transparent);
    border-radius: 8px;
    border-left: 4px solid var(--accent);
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    font-weight: 700;
}

.meta-value {
    font-size: 14px;
    color: var(--text-highlight);
    font-weight: 600;
    margin-top: 4px;
}

/* Objectives Section */
.objectives-box {
    margin-bottom: 32px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 5%, transparent) 0%, transparent 100%);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
}

.objectives-box h3 {
    font-family: 'Inter', sans-serif;
    color: var(--accent);
    font-size: 20px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.objectives-box ul {
    list-style: none;
}

.objectives-box li {
    font-size: 16px;
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.objectives-box li::before {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 12px;
}

/* Markdown Text styling */
.markdown-body h2 {
    font-family: 'Inter', sans-serif;
    color: var(--text-highlight);
    font-size: 24px;
    margin-top: 40px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.markdown-body h3 {
    font-family: 'Inter', sans-serif;
    color: var(--accent);
    font-size: 20px;
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-body p {
    margin-bottom: 16px;
    font-size: 16px;
    color: var(--text-primary);
}

.markdown-body ul, .markdown-body ol {
    margin-left: 20px;
    margin-bottom: 16px;
    font-size: 16px;
}

.markdown-body li {
    margin-bottom: 6px;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    background-color: color-mix(in srgb, var(--accent) 3%, transparent);
    padding: 16px 20px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

.markdown-body blockquote p {
    margin-bottom: 0;
    color: var(--text-highlight);
}

/* Tables */
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
}

.markdown-body th {
    background-color: color-mix(in srgb, var(--accent) 10%, transparent);
    color: var(--text-highlight);
    font-weight: 700;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
}

.markdown-body td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.markdown-body tr:hover td {
    background-color: color-mix(in srgb, var(--accent) 2%, transparent);
}

/* Code Syntax & Pre styling */
pre[class*="language-"] {
    background-color: color-mix(in srgb, var(--bg-primary) 80%, transparent) !important;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 24px 0;
    padding: 16px 20px;
}

code[class*="language-"], pre[class*="language-"] {
    font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
    font-size: 14px;
}

.code-block-wrapper {
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s ease;
}

.copy-code-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--bg-primary);
}

/* Flowchart Rendering */
.svg-flowchart {
    background-color: color-mix(in srgb, var(--bg-primary) 40%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin: 24px 0;
    display: flex;
    justify-content: center;
    overflow-x: auto;
}

.svg-flowchart svg {
    max-width: 100%;
}

/* Slide Deck Presentation Mode */
.slide-deck-container {
    display: flex;
    flex-direction: column;
    height: 70vh;
    justify-content: space-between;
}

.slide-viewport {
    flex: 1;
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

.slide-content {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 40px 60px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-radius: 12px;
}

.slide-content h2 {
    font-family: 'Inter', sans-serif;
    color: var(--accent);
    font-size: 32px;
    margin-bottom: 20px;
    border-bottom: none;
    text-shadow: 0 0 14px color-mix(in srgb, var(--accent) 15%, transparent);
}

.slide-content p, .slide-content ul, .slide-content ol, .slide-content table {
    font-size: 18px;
}

.slide-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 16px 24px;
    border-radius: 10px;
}

.slide-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 20px;
    min-height: var(--btn-min-height);
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
}

.slide-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 15%, transparent);
}

.slide-progress-container {
    flex: 1;
    display: flex;
    align-items: center;
    margin: 0 32px;
    gap: 16px;
}

.slide-progress-bar {
    flex: 1;
    height: 6px;
    background-color: color-mix(in srgb, var(--accent) 10%, transparent);
    border-radius: 3px;
    position: relative;
    overflow: hidden;
}

.slide-progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: var(--progress-pct, 0%);
    background-color: var(--accent);
    box-shadow: 0 0 10px var(--accent);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.slide-index {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.slide-keyboard-hint {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ─── Quiz Mode Interface ─── */

.quiz-card {
    min-height: 50vh;
    display: flex;
    flex-direction: column;
}

.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.quiz-header h2 {
    font-family: 'Inter', sans-serif;
    color: var(--text-highlight);
    font-size: 24px;
}

/* Quiz Mode Selector — pill-segmented control */
.quiz-mode-selector {
    display: inline-flex;
    background: color-mix(in srgb, var(--bg-primary) 60%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 3px;
    gap: 2px;
}

.mode-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 14px;
    min-height: var(--btn-min-height);
    border-radius: 7px;
    transition: all 0.2s ease;
    position: relative;
}

.mode-label input {
    accent-color: var(--accent);
    flex-shrink: 0;
}

.mode-label:has(input:checked) {
    background: var(--bg-secondary);
    color: var(--accent);
    border: 1px solid var(--border-color);
    box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 8%, transparent);
}

.mode-label:hover:not(:has(input:checked)) {
    color: var(--text-highlight);
}

/* Quiz Questions */
.quiz-question-block {
    margin-bottom: 32px;
    background-color: color-mix(in srgb, var(--bg-primary) 20%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    transition: border-color 0.2s ease;
}

.quiz-question-block:hover {
    border-color: var(--border-color-glow);
}

.quiz-q-num {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 8px;
}

.quiz-q-text {
    font-size: 16px;
    color: var(--text-highlight);
    font-weight: 600;
    margin-bottom: 20px;
}

.quiz-options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quiz-option {
    background-color: color-mix(in srgb, var(--bg-secondary) 50%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 14px 18px;
    min-height: 44px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.quiz-option:hover:not(.disabled) {
    border-color: var(--accent);
    background-color: color-mix(in srgb, var(--accent) 5%, transparent);
    transform: translateX(2px);
}

.quiz-option:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-color: var(--accent);
}

.option-badge {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    flex-shrink: 0;
    transition: all 0.15s ease;
}

.quiz-option.selected {
    border-color: var(--accent);
    background-color: color-mix(in srgb, var(--accent) 10%, transparent);
}

.quiz-option.selected .option-badge {
    border-color: var(--accent);
    background-color: var(--accent);
    color: var(--bg-primary);
    font-weight: 800;
}

/* Feedback Styling (Incorrect/Correct reveal) */
.quiz-option.correct {
    border-color: var(--success);
    background-color: color-mix(in srgb, var(--success) 10%, transparent);
}

.quiz-option.correct .option-badge {
    border-color: var(--success);
    background-color: var(--success);
    color: var(--text-highlight);
}

.quiz-option.incorrect {
    border-color: var(--error);
    background-color: color-mix(in srgb, var(--error) 10%, transparent);
}

.quiz-option.incorrect .option-badge {
    border-color: var(--error);
    background-color: var(--error);
    color: var(--text-highlight);
}

.quiz-explanation-box {
    margin-top: 16px;
    background-color: color-mix(in srgb, var(--accent) 2%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.quiz-explanation-box h5 {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 6px;
}

.quiz-explanation-box p {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 0;
}

/* ─── Option Feedback Inline (replaces inline spans in JS) ─── */
.option-feedback {
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.option-feedback.feedback-correct { color: var(--success); }
.option-feedback.feedback-incorrect { color: var(--error); }

/* ─── Graded Scorecard with Ring Gauge ─── */
.quiz-scorecard {
    background-color: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 30px;
    margin-top: 24px;
    animation: fadeIn 0.4s ease;
}

.scorecard-header {
    display: flex;
    align-items: center;
    gap: 32px;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: conic-gradient(
        var(--accent) calc(var(--score-pct, 0) * 3.6deg),
        color-mix(in srgb, var(--accent) 10%, transparent) 0deg
    );
    flex-shrink: 0;
}
.score-circle::before {
    content: '';
    position: absolute;
    inset: 6px;
    border-radius: 50%;
    background: var(--bg-secondary);
}

.score-circle.pass {
    background: conic-gradient(
        var(--success) calc(var(--score-pct, 0) * 3.6deg),
        color-mix(in srgb, var(--success) 10%, transparent) 0deg
    );
}

.score-circle.fail {
    background: conic-gradient(
        var(--error) calc(var(--score-pct, 0) * 3.6deg),
        color-mix(in srgb, var(--error) 10%, transparent) 0deg
    );
}

.score-number {
    font-family: 'Inter', sans-serif;
    font-size: 32px;
    font-weight: 800;
    color: var(--text-highlight);
    position: relative;
    z-index: 1;
}

.score-label {
    font-size: 12px;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.score-circle.pass .score-label { color: var(--success); }
.score-circle.fail .score-label { color: var(--error); }

.score-details h3 {
    font-family: 'Inter', sans-serif;
    color: var(--text-highlight);
    font-size: 20px;
    margin-bottom: 8px;
}

.score-details p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.passing-score-text {
    font-size: 12px;
    font-style: italic;
}

/* Custom Buttons */
.btn {
    padding: 12px 24px;
    min-height: var(--btn-min-height);
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background-color: var(--accent-dim);
    box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 35%, transparent);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent);
}

.quiz-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 24px;
}

/* Instructor Section */
.instructor-header h2 {
    font-family: 'Inter', sans-serif;
    color: var(--text-highlight);
    font-size: 24px;
    margin-bottom: 12px;
}

.instructor-body {
    margin-top: 24px;
}

/* ─── Alerts ─── */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin: 16px 0;
    font-size: 14px;
    border-left: 4px solid transparent;
}

.alert-warning {
    background-color: color-mix(in srgb, var(--warning) 5%, transparent);
    border-color: var(--warning);
    color: var(--alert-warning-text);
}

.alert-warning strong {
    color: var(--text-highlight);
}

/* Info alert — used for the Begin Exam gate and neutral notices */
.alert-info {
    background: var(--alert-info-bg);
    border-color: var(--alert-info-border);
    color: var(--text-primary);
}
.alert-info strong {
    color: var(--accent);
}

/* ─── Exam Gate (Begin Exam CTA) ─── */
.exam-gate {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 24px 0;
}
.exam-gate .alert {
    width: 100%;
}

/* ─── Quiz Loading, Cooldown & Error States (replaces inline styles) ─── */
.quiz-loading-state {
    text-align: center;
    padding: 40px;
    color: var(--text-primary);
}
.loading-spinner {
    font-size: 2em;
    color: var(--accent);
    margin-bottom: 15px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.cooldown-notice {
    text-align: center;
    padding: 40px;
    margin: 20px 0;
}
.cooldown-icon {
    font-size: 3em;
    color: var(--accent);
    margin-bottom: 20px;
    display: block;
}
.cooldown-header {
    color: var(--accent);
    margin-bottom: 10px;
}
.cooldown-message {
    font-size: 1.1em;
    line-height: 1.6;
    margin-bottom: 0;
}

.error-state {
    text-align: center;
    padding: 30px;
}
.error-state-icon {
    font-size: 2.5em;
    color: var(--error);
    margin-bottom: 15px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* ─── Modal System ─── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 20, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    padding: 20px;
    animation: fadeIn 0.15s ease;
}
.modal-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-color-glow);
    border-radius: 12px;
    padding: 28px 32px;
    max-width: 520px;
    width: 100%;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
    position: relative;
    animation: modalPop 0.2s ease-out;
}
@keyframes modalPop {
    from { opacity: 0; transform: scale(0.92); }
    to { opacity: 1; transform: scale(1); }
}
.modal-panel h3 {
    margin: 0 0 12px 0;
    color: var(--accent);
    font-size: 1.25em;
    font-weight: 700;
}
.modal-panel p {
    margin: 0 0 16px 0;
    line-height: 1.5;
    font-size: 1em;
    color: var(--text-primary);
}
.modal-details-box {
    background: color-mix(in srgb, var(--accent) 4%, transparent);
    border-left: 3px solid var(--accent);
    padding: 10px 14px;
    margin-bottom: 16px;
    border-radius: 4px;
    font-size: 0.95em;
    max-height: 160px;
    overflow-y: auto;
    color: var(--text-secondary);
}
.modal-close-btn {
    position: absolute;
    top: 8px;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color 0.2s ease;
}
.modal-close-btn:hover {
    color: var(--accent);
}
.modal-btn {
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    padding: 10px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 700;
    font-size: 1em;
    float: right;
    transition: all 0.2s ease;
    min-height: var(--btn-min-height);
    font-family: 'Inter', sans-serif;
}
.modal-btn:hover {
    background: var(--accent-dim);
    box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 35%, transparent);
}

/* ─── Instructor Answer Key Styles ─── */
.answer-key-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    margin: 12px 0;
}
.answer-key-table th {
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    color: var(--text-highlight);
    font-weight: 600;
    padding: 10px 14px;
    text-align: left;
    border-bottom: 2px solid var(--border-color-glow);
}
.answer-key-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}
.grading-key-separator {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
}
.grading-key-answer-block {
    margin-top: 10px;
    padding-left: 15px;
    border-left: 2px solid var(--accent);
    color: var(--text-primary);
}

/* ─── Module Attribution (post-submit review) ─── */
.module-attribution {
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 6px;
    padding-bottom: 6px;
    border-bottom: 1px dashed color-mix(in srgb, var(--accent) 20%, transparent);
}

/* Collapsible Section for grading keys in Reading / Written mode */
.grading-key-toggle-btn {
    background-color: color-mix(in srgb, var(--accent) 5%, transparent);
    border: 1px solid var(--border-color);
    color: var(--accent);
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 12px 0;
    transition: all 0.2s ease;
    min-height: var(--btn-min-height);
}

.grading-key-toggle-btn:hover {
    background-color: color-mix(in srgb, var(--accent) 10%, transparent);
    transform: translateX(2px);
}

.grading-key-content {
    background-color: color-mix(in srgb, var(--bg-primary) 40%, transparent);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    padding: 20px;
    margin-top: 10px;
    margin-bottom: 20px;
    animation: slideDown 0.3s ease;
}

/* Collapsed class for responsive layout toggling */
.sidebar.collapsed {
    transform: translateX(-100%);
}

@media (max-width: 1024px) {
    .sidebar {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .content-header {
        padding: 0 16px;
    }
}

/* Polyglot Code Tabs */
.code-tabs {
    border: 1px solid var(--border-color);
    background-color: color-mix(in srgb, var(--bg-primary) 40%, transparent);
    border-radius: 8px;
    margin: 24px 0;
    overflow: hidden;
}
.tab-headers {
    display: flex;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}
.tab-header {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}
.tab-header:hover {
    color: var(--text-highlight);
    background-color: color-mix(in srgb, var(--accent) 2%, transparent);
}
.tab-header.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background-color: color-mix(in srgb, var(--accent) 5%, transparent);
}
.tab-contents .tab-content {
    display: none;
}
.tab-contents .tab-content.active {
    display: block;
}
.tab-contents pre {
    margin: 0 !important;
    border: none !important;
    border-radius: 0 !important;
}

/* ==========================================================================
   Print Stylesheet
   ========================================================================== */
@media print {
    body {
        background-color: #ffffff !important;
        color: #000000 !important;
        font-size: 12pt;
    }
    
    .sidebar, .sidebar-toggle, .view-selector, .slide-controls, .slide-keyboard-hint, .quiz-mode-selector, .quiz-footer, #retry-quiz-btn {
        display: none !important;
    }
    
    .main-content {
        overflow: visible !important;
        height: auto !important;
    }
    
    .viewer-panel {
        padding: 0 !important;
        background: none !important;
    }
    
    .card, .glass-card {
        background: none !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        backdrop-filter: none !important;
    }
    
    .metadata-grid {
        border-left: 2px solid #000000 !important;
        background-color: #f3f4f6 !important;
        color: #000000 !important;
    }
    
    .meta-value, .meta-label {
        color: #000000 !important;
    }
    
    .markdown-body h2, .markdown-body h3 {
        color: #000000 !important;
        border-bottom: 1px solid #e5e7eb !important;
    }
    
    pre[class*="language-"] {
        background-color: #f9fafb !important;
        border: 1px solid #d1d5db !important;
        color: #000000 !important;
        page-break-inside: avoid;
    }
    
    code[class*="language-"] {
        color: #000000 !important;
    }
    
    table, tr, td, th {
        border-color: #d1d5db !important;
        color: #000000 !important;
    }
    
    th {
        background-color: #f3f4f6 !important;
    }
    
    .objectives-box {
        background: none !important;
        border: 1px solid #d1d5db !important;
        color: #000000 !important;
    }
    
    .objectives-box h3 {
        color: #000000 !important;
    }

    .score-circle {
        background: none !important;
    }
    .score-circle::before {
        display: none;
    }
}

/* ─── Mermaid Diagrams ─── */
.mermaid-host {
    margin: 2em 0;
    padding: 28px 24px;
    min-height: 120px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--card-bg) 100%);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    text-align: center;
    overflow-x: auto;
    position: relative;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .15);
    display: flex;
    align-items: center;
    justify-content: center;
}
.mermaid-host::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: .6;
}
.mermaid-host svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }
.mermaid-host.mermaid-rendered { display: block; }
[data-theme="light"] .mermaid-host {
    box-shadow: 0 4px 24px rgba(0, 0, 0, .05);
}

.mermaid-loading {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: .875rem;
}
.mermaid-loading svg {
    animation: mermaidSpin 1.2s linear infinite;
    color: var(--accent);
}
@keyframes mermaidSpin {
    to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
    .mermaid-loading svg { animation: none; }
}

.mermaid-error {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    background: color-mix(in srgb, var(--error) 8%, var(--bg-secondary));
    border-radius: 6px;
    color: var(--error);
    font-size: .875rem;
    text-align: left;
}
.mermaid-error svg { flex-shrink: 0; }

.mermaid-fallback {
    font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
    font-size: .8125rem;
    text-align: left;
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 6px;
    color: var(--text-secondary);
    margin: 0;
}

.mermaid-host .node:hover rect,
.mermaid-host .node:hover polygon,
.mermaid-host .node:hover circle {
    filter: drop-shadow(0 0 6px var(--accent));
    cursor: pointer;
}