:root {
    --bg: #0b1329;
    --surface: rgba(18, 30, 52, 0.65);
    --surface-solid: #121e34;
    --surface-2: rgba(26, 42, 70, 0.6);
    --surface-2-solid: #1a2a46;
    --surface-3: rgba(36, 59, 97, 0.7);
    --surface-3-solid: #243b61;
    --text: #f3f4f6;
    --muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(59, 130, 246, 0.4);
    
    --green: #10b981;
    --green-bg: rgba(16, 185, 129, 0.15);
    --green-border: rgba(16, 185, 129, 0.4);
    
    --blue: #3b82f6;
    --blue-bg: rgba(59, 130, 246, 0.15);
    --blue-border: rgba(59, 130, 246, 0.4);
    
    --purple: #8b5cf6;
    --purple-bg: rgba(139, 92, 246, 0.15);
    
    --yellow: #f59e0b;
    --yellow-bg: rgba(245, 158, 11, 0.15);
    --yellow-border: rgba(245, 158, 11, 0.4);
    
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --danger-border: rgba(239, 68, 68, 0.4);
    
    --header-height: 72px;
    --footer-height: 84px;
    --shadow-premium: 0 30px 60px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

body.light-session {
    --bg: #f1f5f9;
    --surface: rgba(255, 255, 255, 0.7);
    --surface-solid: #ffffff;
    --surface-2: rgba(241, 245, 249, 0.85);
    --surface-2-solid: #f1f5f9;
    --surface-3: rgba(226, 232, 240, 0.9);
    --surface-3-solid: #e2e8f0;
    --text: #0f172a;
    --muted: #64748b;
    --border: rgba(15, 23, 42, 0.08);
    --border-hover: rgba(59, 130, 246, 0.3);
    
    --green-bg: rgba(16, 185, 129, 0.1);
    --blue-bg: rgba(59, 130, 246, 0.08);
    --yellow-bg: rgba(245, 158, 11, 0.1);
    --danger-bg: rgba(239, 68, 68, 0.08);
    
    --shadow-premium: 0 30px 60px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

/* --- Keyframe Animations --- */
@keyframes pulseGlow {
    0% { box-shadow: 0 0 10px rgba(59, 130, 246, 0.2); }
    50% { box-shadow: 0 0 20px rgba(59, 130, 246, 0.45); }
    100% { box-shadow: 0 0 10px rgba(59, 130, 246, 0.2); }
}

@keyframes slideFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes backgroundShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes timerPulse {
    to { transform: scale(1.025); }
}

@keyframes stageEnter {
    from { opacity: 0; transform: translateY(12px) scale(0.99); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes answerEnter {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes dialogEnter {
    from { opacity: 0; transform: translateY(14px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes pulseBorder {
    0% { border-color: var(--border); }
    50% { border-color: var(--blue); }
    100% { border-color: var(--border); }
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    color: var(--text);
    background-size: 200% 200%;
    animation: backgroundShift 15s ease infinite;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.06), transparent 45%),
        radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.08), transparent 45%),
        linear-gradient(135deg, var(--bg), var(--surface-solid));
    font-family: "Inter", sans-serif;
    transition: background 0.3s ease, color 0.3s ease;
}

button,
a {
    font: inherit;
    color: inherit;
    text-decoration: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

button:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.5);
    outline-offset: 3px;
}

/* Webkit Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.3);
    border-radius: 99px;
}
.light-session ::-webkit-scrollbar-thumb {
    background: rgba(15, 23, 42, 0.15);
}

/* --- Focus Room Shell --- */
.focus-room {
    height: 100dvh;
    display: grid;
    grid-template-rows: var(--header-height) 6px minmax(0, 1fr) var(--footer-height);
}

/* Header */
.focus-header {
    padding: 0 32px;
    border-bottom: 1px solid var(--border);
    background: rgba(11, 19, 41, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: grid;
    grid-template-columns: minmax(200px, auto) minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
    z-index: 10;
}

.light-session .focus-header {
    background: rgba(255, 255, 255, 0.8);
}

.focus-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.focus-brand img {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

.focus-session-meta {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.focus-session-meta span {
    max-width: 200px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--muted);
    background: var(--surface-2);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.focus-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.icon-button,
.exit-button {
    min-width: 40px;
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-2);
    font-weight: 700;
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.icon-button:hover,
.exit-button:hover {
    border-color: var(--border-hover);
    background: var(--surface-3);
    transform: translateY(-1px);
}

.exit-button {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.2);
}
.exit-button:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
}

/* Progress Bar */
.focus-progress {
    background: var(--surface-2-solid);
    overflow: visible;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.focus-progress span,
#tkaLmsProgressBar {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--blue), var(--purple), var(--green));
    background-size: 200% 200%;
    animation: backgroundShift 3s ease infinite;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}

.focus-progress span::after,
#tkaLmsProgressBar::after {
    content: '';
    position: absolute;
    top: -2px;
    right: -2px;
    bottom: -2px;
    width: 10px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 12px white, 0 0 6px var(--blue);
}

.lms-session .focus-brand span::after {
    content: " · LMS";
    color: var(--blue);
    font-size: 11px;
    font-weight: 800;
}

/* --- Layout Grid --- */
.focus-layout {
    min-height: 0;
    padding: 24px 32px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 310px;
    gap: 24px;
}

.question-stage,
.focus-sidebar {
    min-height: 0;
    border-radius: 24px;
    backdrop-filter: blur(30px) saturate(160%);
    -webkit-backdrop-filter: blur(30px) saturate(160%);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-premium);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, background-color 0.3s ease;
}

.question-stage:hover,
.focus-sidebar:hover {
    transform: translateY(-2px);
    box-shadow: 0 35px 70px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.light-session .question-stage:hover,
.light-session .focus-sidebar:hover {
    box-shadow: 0 35px 70px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

/* Question Stage */
.question-stage {
    padding: 36px 44px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    overflow-y: auto;
    animation: stageEnter 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.question-overline {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.question-overline span:first-child {
    color: var(--blue);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 800;
}

.question-stage h1,
h1#tkaLmsQuestionTitle {
    max-width: 980px;
    margin-bottom: 24px;
    font-size: clamp(1.4rem, 2.5vw, 1.85rem);
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: -0.02em;
    color: var(--text);
    text-wrap: balance;
}

/* Stimulus Box */
.lms-stimulus,
.stimulus-box {
    font-size: 1.02rem;
    line-height: 1.75;
    color: var(--text);
    margin-bottom: 24px;
    padding: 18px 20px;
    background: rgba(0, 0, 0, 0.12);
    border-left: 4px solid var(--blue);
    border-radius: 0 16px 16px 0;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05);
    opacity: 0.95;
}

.light-session .lms-stimulus,
.light-session .stimulus-box {
    background: rgba(241, 245, 249, 0.9);
    color: #1e293b;
    box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.02);
}

/* Answer Choices */
.answer-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    counter-reset: answer-counter;
}

.answer-choice {
    min-height: 72px;
    padding: 14px 20px;
    border: 2px solid transparent;
    border-radius: 16px;
    color: var(--text);
    background: var(--surface-2);
    cursor: pointer;
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    align-items: center;
    gap: 16px;
    text-align: left;
    font-weight: 600;
    font-size: 1.02rem;
    line-height: 1.45;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    position: relative;
    overflow: hidden;
    z-index: 1;
    counter-increment: answer-counter;
}

.answer-choice::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), transparent);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.answer-choice:hover::after {
    opacity: 1;
}

.answer-choice:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.005);
    border-color: var(--border-hover);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.1);
    background: var(--surface-3);
}

.answer-choice:disabled {
    cursor: default;
}

/* Selector for counter display in TKA Focus page */
body[data-page="tka-quiz"] .answer-choice::before {
    content: counter(answer-counter, upper-alpha);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--surface-3);
    color: var(--muted);
    font-weight: 800;
    font-size: 0.95rem;
    transition: all 0.25s ease;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

body[data-page="tka-quiz"] .answer-choice:hover:not(:disabled)::before {
    background: var(--blue);
    color: white;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

/* Styling for non-TKA (quiz-session.html) element counter */
.answer-key {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--surface-3);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
    transition: all 0.25s ease;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.08);
}

.answer-choice:hover:not(:disabled) .answer-key {
    background: var(--blue);
    color: white;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

/* Chosen / Selected State */
.answer-choice.selected {
    border-color: var(--blue);
    background: var(--blue-bg);
    animation: pulseGlow 2.5s infinite;
}

body[data-page="tka-quiz"] .answer-choice.selected::before,
.answer-choice.selected .answer-key {
    background: var(--blue);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* Correct / Wrong States */
.answer-choice.is-correct,
.answer-choice.correct {
    border-color: var(--green);
    background: var(--green-bg);
}

body[data-page="tka-quiz"] .answer-choice.is-correct::before,
body[data-page="tka-quiz"] .answer-choice.correct::before,
.answer-choice.is-correct .answer-key,
.answer-choice.correct .answer-key {
    background: var(--green);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.answer-choice.is-wrong,
.answer-choice.wrong {
    border-color: var(--danger);
    background: var(--danger-bg);
}

body[data-page="tka-quiz"] .answer-choice.is-wrong::before,
body[data-page="tka-quiz"] .answer-choice.wrong::before,
.answer-choice.is-wrong .answer-key,
.answer-choice.wrong .answer-key {
    background: var(--danger);
    color: white;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.answer-choice.hidden-choice {
    visibility: hidden;
    pointer-events: none;
    opacity: 0;
}

/* Feedback Box */
.answer-feedback {
    min-height: 0;
    max-height: 0;
    margin-top: 0;
    padding: 0 20px;
    border: 1px solid transparent;
    border-radius: 16px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.6;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease, margin 0.3s ease, border-color 0.3s ease;
}

.answer-feedback.show,
.answer-feedback:not(:empty) {
    max-height: 140px;
    margin-top: 18px;
    padding: 16px 20px;
    border-color: var(--border);
    background: var(--surface-2);
    overflow-y: auto;
}

.answer-feedback strong {
    color: var(--text);
    font-weight: 700;
    margin-bottom: 4px;
    display: block;
}

/* --- Focus Sidebar --- */
.focus-sidebar {
    padding: 20px;
    display: grid;
    grid-template-rows: auto auto auto minmax(0, 1fr) auto;
    gap: 16px;
}

/* Timer Badge Widget */
.timer-card {
    padding: 16px 20px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(22, 40, 71, 0.8), rgba(18, 30, 52, 0.85));
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.light-session .timer-card {
    background: linear-gradient(135deg, #ffffff, #f1f5f9);
    border: 1px solid var(--border);
}

.timer-card span {
    color: var(--muted);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.timer-card strong,
#timerValue,
#tkaTimerDisplay {
    font-size: 26px;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, var(--blue), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.timer-card.warning {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.9), rgba(245, 158, 11, 0.9));
    border-color: transparent;
    animation: timerPulse 0.8s ease-in-out infinite alternate;
}

.timer-card.warning span {
    color: rgba(255, 255, 255, 0.8);
}
.timer-card.warning strong,
.timer-card.warning #timerValue,
.timer-card.warning #tkaTimerDisplay {
    -webkit-text-fill-color: white;
    color: white;
}

/* Session Stats Dashboard */
.session-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.session-stats div,
.result-stats div {
    padding: 12px;
    border-radius: 14px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.session-stats span,
.result-stats span {
    display: block;
    margin-bottom: 4px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.session-stats strong {
    font-size: 18px;
    font-weight: 800;
}

/* Question Navigator Grid */
.question-nav-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 700;
    color: var(--muted);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.question-nav-head button {
    display: none;
    font-size: 24px;
    line-height: 1;
    color: var(--muted);
}

.question-navigator {
    min-height: 0;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    align-content: start;
    gap: 8px;
    overflow-y: auto;
    padding-right: 4px;
}

.question-jump {
    aspect-ratio: 1;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    background: var(--surface-2);
    font-size: 13px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.question-jump:hover:not(.current) {
    transform: scale(1.1) translateY(-1px);
    border-color: var(--border-hover);
    background: var(--surface-3);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.question-jump.current {
    color: white;
    border-color: transparent;
    background: linear-gradient(135deg, var(--blue), var(--purple));
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    transform: scale(1.08);
}

.question-jump.answered,
.question-jump.correct {
    border-color: var(--green-border);
    background: var(--green-bg);
}

.question-jump.wrong {
    border-color: var(--danger-border);
    background: var(--danger-bg);
}

.question-jump.flagged,
.question-jump.review {
    border-color: var(--yellow-border);
    background: var(--yellow-bg);
}

/* Nav Legend */
.nav-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--muted);
    font-size: 9px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.nav-legend span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.nav-legend i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--surface-3-solid);
}

.nav-legend i.current { background: var(--blue); }
.nav-legend i.answered { background: var(--green); }
.nav-legend i.flagged { background: var(--yellow); }

/* --- Footer Actions Layout --- */
.focus-actions {
    padding: 0 32px;
    border-top: 1px solid var(--border);
    background: rgba(11, 19, 41, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 10;
}

.light-session .focus-actions {
    background: rgba(255, 255, 255, 0.85);
}

.assist-actions,
.primary-actions,
.result-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-button {
    min-height: 46px;
    padding: 0 20px;
    border: 1px solid transparent;
    border-radius: 12px;
    color: var(--text);
    font-weight: 700;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.action-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.action-button:disabled {
    cursor: not-allowed;
    opacity: 0.38;
}

.action-button.subtle {
    border-color: var(--border);
    background: var(--surface-2);
}
.action-button.subtle:hover:not(:disabled) {
    border-color: var(--border-hover);
    background: var(--surface-3);
}

.action-button.secondary {
    color: var(--text);
    border-color: var(--border);
    background: var(--surface-3);
}
.action-button.secondary:hover:not(:disabled) {
    border-color: var(--border-hover);
    background: var(--surface-2);
}

.action-button.primary {
    min-width: 140px;
    color: white;
    background: linear-gradient(135deg, var(--green), var(--blue));
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.25);
}
.action-button.primary:hover:not(:disabled) {
    box-shadow: 0 12px 28px rgba(59, 130, 246, 0.45);
    transform: translateY(-3px) scale(1.02);
}

#navigatorButton {
    display: none;
}

/* Note Textarea for Concept Capture */
.lms-note-box {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}
.lms-note-box label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
textarea#tkaQuestionNote {
    width: 100%;
    background: var(--surface-2);
    border: 2px solid transparent;
    color: var(--text);
    padding: 12px 16px;
    border-radius: 14px;
    min-height: 84px;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    margin-bottom: 10px;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: all 0.25s ease;
}
textarea#tkaQuestionNote:focus {
    outline: none;
    border-color: var(--blue);
    background: var(--surface-solid);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02), 0 0 0 4px rgba(59, 130, 246, 0.15);
}

/* --- Result Scorecard Overlay --- */
.result-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    padding: 24px;
    background: rgba(4, 8, 17, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    place-items: center;
}

.result-overlay:not([hidden]) {
    display: grid;
}

.result-panel {
    width: min(680px, 100%);
    max-height: calc(100dvh - 48px);
    padding: 44px;
    border: 1px solid var(--border);
    border-radius: 28px;
    background: var(--surface-solid);
    box-shadow: 0 40px 90px rgba(0, 0, 0, 0.5);
    text-align: center;
    overflow-y: auto;
    animation: dialogEnter 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.result-kicker {
    color: var(--blue);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.result-score {
    margin: 12px 0;
    font-size: clamp(4.5rem, 10vw, 6.5rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.05em;
    background: linear-gradient(90deg, var(--blue), var(--purple), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.result-panel h2 {
    margin-bottom: 12px;
    font-size: clamp(20px, 3.5vw, 28px);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.result-panel p {
    color: var(--muted);
    font-size: 15px;
    font-weight: 500;
    line-height: 1.6;
}

.result-insight {
    margin-top: 20px;
    padding: 16px 20px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 16px;
    color: var(--text);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(16, 185, 129, 0.06));
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
}

.result-stats {
    margin: 28px 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    text-align: left;
}

.result-stats div {
    border: 1px solid var(--border);
}

.result-stats strong {
    font-size: 20px;
    font-weight: 800;
}

.result-actions {
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

/* Toast */
.focus-toast {
    position: fixed;
    left: 50%;
    bottom: calc(var(--footer-height) + 16px);
    z-index: 120;
    max-width: calc(100% - 32px);
    padding: 14px 22px;
    border: 1px solid var(--border);
    border-radius: 14px;
    color: white;
    background: rgba(11, 19, 41, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 15px 36px rgba(0, 0, 0, 0.3);
    font-size: 13px;
    font-weight: 700;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 12px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.focus-toast.show {
    opacity: 1;
    transform: translate(-50%, 0);
}

/* Confirmation Overlay */
.confirm-overlay {
    position: fixed;
    inset: 0;
    z-index: 140;
    padding: 20px;
    background: rgba(4, 8, 17, 0.8);
    backdrop-filter: blur(12px);
    place-items: center;
}

.confirm-overlay:not([hidden]) {
    display: grid;
}

.confirm-dialog {
    width: min(440px, 100%);
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--surface-solid);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: dialogEnter 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.confirm-dialog h2 {
    margin: 12px 0 8px;
    font-size: 22px;
    font-weight: 800;
}

.confirm-dialog p {
    margin-bottom: 24px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.6;
}

.dialog-open {
    overflow: hidden;
}

/* --- Responsive Media Queries --- */
@media (max-width: 900px) {
    :root {
        --header-height: 64px;
        --footer-height: 76px;
    }

    .focus-header {
        padding: 0 16px;
        grid-template-columns: 1fr auto;
    }

    .focus-session-meta {
        display: none;
    }

    .focus-brand img {
        width: 34px;
        height: 34px;
    }

    .focus-layout {
        padding: 16px;
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .question-stage {
        padding: 24px;
        border-radius: 20px;
    }

    .focus-sidebar {
        position: fixed;
        inset: 10px 10px calc(var(--footer-height) + 10px) auto;
        z-index: 80;
        width: min(320px, calc(100% - 20px));
        transform: translateX(calc(100% + 20px));
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
        grid-template-rows: auto auto auto 1fr auto;
    }

    .focus-sidebar.open {
        transform: translateX(0);
        box-shadow: 0 40px 100px rgba(0, 0, 0, 0.6);
    }

    .question-nav-head button,
    #navigatorButton {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .focus-actions {
        padding: 0 16px;
    }

    .assist-actions .action-button:not(#navigatorButton):not(#flagButton):not(#tkaMarkReview) {
        display: none;
    }
}

@media (max-width: 640px) {
    .focus-brand span,
    .exit-button {
        display: none;
    }

    .focus-header {
        grid-template-columns: auto 1fr;
    }

    .focus-header-actions {
        justify-self: end;
    }

    .question-stage {
        justify-content: flex-start;
        overflow-y: auto;
    }

    .question-stage h1,
    h1#tkaLmsQuestionTitle {
        font-size: clamp(1.25rem, 5vw, 1.5rem);
    }

    .answer-list {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .answer-choice {
        min-height: 60px;
        padding: 10px 16px;
    }

    .focus-actions .action-button {
        min-height: 42px;
        padding: 0 12px;
        font-size: 13px;
        border-radius: 10px;
    }

    #skipButton {
        display: none;
    }

    .action-button.primary {
        min-width: 96px;
    }

    .primary-actions {
        margin-left: auto;
    }

    .result-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-height: 690px) and (min-width: 641px) {
    .question-stage {
        padding-top: 20px;
        padding-bottom: 20px;
    }

    .question-stage h1,
    h1#tkaLmsQuestionTitle {
        margin-bottom: 18px;
        font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    }

    .answer-choice {
        min-height: 58px;
        padding-top: 8px;
        padding-bottom: 8px;
    }
}

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

/* --- Question Stage Smooth Transition --- */
#questionStage {
    transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.question-fade-out {
    opacity: 0;
    transform: translateY(-16px);
}

.question-fade-in {
    opacity: 0;
    transform: translateY(12px);
    transition: none !important;
}

/* Timer Control Buttons */
.timer-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    width: 100%;
}
.timer-actions .action-button {
    flex: 1;
    min-height: 32px;
    padding: 0 10px;
    font-size: 11px;
    border-radius: 8px;
}

/* Button Icon Enhancements via FontAwesome Unicode */
#hintButton::before, #tkaShowHint::before {
    content: "\f0eb";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
    color: var(--yellow);
}
#fiftyButton::before {
    content: "\f24e";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
    color: var(--blue);
}
#bookmarkButton::before {
    content: "\f02e";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
    color: var(--purple);
}
#flagButton::before, #tkaMarkReview::before {
    content: "\f024";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
    color: var(--danger);
}
#tkaPrevQuestion::before {
    content: "\f060";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
}
#tkaSubmitAnswer::before {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
}
#nextButton::after, #tkaNextQuestion::after {
    content: "\f061";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-left: 8px;
}
#skipButton::before {
    content: "\f054";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
}

/* --- Focus Room Fresh UX Upgrade --- */
:root {
    --cyan: #05b6d8;
    --lime: #7ee047;
    --ink: #08111f;
}

body {
    background-image:
        linear-gradient(135deg, rgba(5, 182, 216, 0.1), transparent 32%),
        radial-gradient(circle at 82% 10%, rgba(126, 224, 71, 0.12), transparent 28%),
        radial-gradient(circle at 16% 84%, rgba(59, 130, 246, 0.16), transparent 30%),
        linear-gradient(135deg, #08111f, #111d33 54%, #07111e);
}

body.light-session {
    background-image:
        linear-gradient(135deg, rgba(5, 182, 216, 0.1), transparent 35%),
        radial-gradient(circle at 84% 16%, rgba(126, 224, 71, 0.14), transparent 28%),
        linear-gradient(135deg, #f7fbff, #eef6fb);
}

.focus-header {
    min-width: 0;
    grid-template-columns: minmax(210px, auto) minmax(240px, 1fr) auto;
}

.focus-live-summary {
    min-width: 118px;
    min-height: 42px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(5, 182, 216, 0.12), rgba(126, 224, 71, 0.08));
    display: grid;
    place-items: center;
    gap: 1px;
}

.focus-live-summary span {
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.focus-live-summary strong {
    color: var(--text);
    font-size: 17px;
    font-weight: 900;
}

#toolsButton::before {
    content: "\f0ad";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 8px;
    color: var(--cyan);
}

.focus-progress {
    height: 8px;
}

.focus-progress span,
#tkaLmsProgressBar {
    background: linear-gradient(90deg, var(--cyan), var(--blue), var(--lime));
}

.focus-layout {
    grid-template-columns: minmax(0, 1fr) 340px;
}

.question-stage,
.focus-sidebar {
    border-radius: 22px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.055), transparent),
        rgba(12, 24, 43, 0.72);
}

.light-session .question-stage,
.light-session .focus-sidebar {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.68)),
        rgba(255, 255, 255, 0.74);
}

.session-insight {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 18px;
}

.session-insight span {
    min-width: 0;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: center;
}

.session-insight strong {
    display: block;
    color: var(--text);
    font-size: 17px;
    line-height: 1.1;
}

.question-overline {
    align-items: flex-start;
}

.question-stage h1,
h1#tkaLmsQuestionTitle {
    max-width: 1040px;
    font-size: clamp(1.55rem, 2.65vw, 2.1rem);
}

.confidence-controls {
    width: fit-content;
    max-width: 100%;
    margin: 0 0 18px;
    padding: 5px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface-2);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.confidence-controls span {
    padding: 0 10px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.confidence-controls button {
    min-height: 32px;
    padding: 0 14px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
}

.confidence-controls button.active {
    color: #03111b;
    background: linear-gradient(135deg, var(--cyan), var(--lime));
    box-shadow: 0 8px 18px rgba(5, 182, 216, 0.22);
}

.answer-list {
    gap: 12px;
}

.answer-choice {
    border-width: 1px;
    border-color: var(--border);
    border-radius: 18px;
}

.answer-choice:hover:not(:disabled) {
    border-color: rgba(5, 182, 216, 0.45);
}

.answer-feedback.show,
.answer-feedback:not(:empty) {
    border-color: rgba(5, 182, 216, 0.24);
    background: linear-gradient(135deg, rgba(5, 182, 216, 0.1), rgba(126, 224, 71, 0.06));
}

.timer-card {
    border-radius: 18px;
    background:
        radial-gradient(circle at 84% 22%, rgba(126, 224, 71, 0.22), transparent 34%),
        linear-gradient(135deg, rgba(5, 182, 216, 0.17), rgba(18, 30, 52, 0.86));
}

.session-stats div:nth-child(1) strong { color: var(--green); }
.session-stats div:nth-child(2) strong { color: var(--danger); }
.session-stats div:nth-child(3) strong { color: var(--yellow); }
.session-stats div:nth-child(4) strong { color: var(--cyan); }

.question-jump.sure {
    box-shadow: inset 0 0 0 2px rgba(126, 224, 71, 0.55);
}

.question-jump.review-confidence {
    box-shadow: inset 0 0 0 2px rgba(245, 158, 11, 0.55);
}

.nav-legend i.sure {
    background: var(--lime);
}

.focus-actions {
    min-height: var(--footer-height);
}

.assist-actions {
    flex-wrap: wrap;
}

.action-button {
    border-radius: 14px;
}

.action-button.primary {
    background: linear-gradient(135deg, var(--lime), var(--cyan), var(--blue));
}

.result-panel {
    width: min(820px, 100%);
    background:
        radial-gradient(circle at 84% 8%, rgba(126, 224, 71, 0.13), transparent 28%),
        var(--surface-solid);
}

.command-palette,
.review-drawer {
    position: fixed;
    inset: 0;
    z-index: 150;
    padding: 22px;
    background: rgba(4, 8, 17, 0.76);
    backdrop-filter: blur(18px);
}

.command-palette:not([hidden]),
.review-drawer:not([hidden]) {
    display: grid;
}

.command-palette {
    place-items: center;
}

.command-panel {
    width: min(560px, 100%);
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--surface-solid);
    box-shadow: 0 36px 90px rgba(0, 0, 0, 0.48);
    animation: dialogEnter 0.28s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.command-head,
.review-drawer-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.command-head h2,
.review-drawer-head h2 {
    margin-top: 6px;
    font-size: 24px;
    font-weight: 900;
}

.command-head button,
.review-drawer-head button {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    color: var(--muted);
    background: var(--surface-2);
    font-size: 24px;
}

.command-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.command-grid button {
    min-height: 54px;
    padding: 0 16px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface-2);
    color: var(--text);
    text-align: left;
    font-weight: 900;
}

.command-grid button:hover {
    border-color: rgba(5, 182, 216, 0.45);
    background: var(--surface-3);
}

.command-hint {
    margin-top: 16px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.review-drawer {
    justify-items: end;
}

.review-drawer-panel {
    width: min(520px, 100%);
    height: 100%;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--surface-solid);
    box-shadow: 0 36px 90px rgba(0, 0, 0, 0.5);
    display: grid;
    grid-template-rows: auto auto minmax(0, 1fr);
    animation: dialogEnter 0.28s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.review-summary {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 14px;
}

.review-summary span {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
}

.review-summary strong {
    display: block;
    color: var(--text);
    font-size: 18px;
}

.review-list {
    min-height: 0;
    overflow-y: auto;
    display: grid;
    align-content: start;
    gap: 10px;
}

.review-answer-item {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface-2);
    color: var(--text);
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    text-align: left;
}

.review-answer-item.correct { border-color: var(--green-border); }
.review-answer-item.wrong { border-color: var(--danger-border); }
.review-answer-item.empty { border-color: var(--yellow-border); }

.review-answer-number {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: var(--surface-3);
    display: grid;
    place-items: center;
    font-weight: 900;
}

.review-answer-copy {
    min-width: 0;
}

.review-answer-copy strong,
.review-answer-copy small {
    display: block;
}

.review-answer-copy small {
    margin-top: 3px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.35;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.review-answer-meta {
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    text-transform: uppercase;
}

.session-empty-state {
    min-height: 100dvh;
    padding: 24px;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 14px;
    text-align: center;
}

.session-empty-state img {
    width: 92px;
    height: 92px;
    object-fit: contain;
}

.session-empty-state h1 {
    font-size: clamp(26px, 5vw, 44px);
    font-weight: 900;
}

.session-empty-state p {
    max-width: 460px;
    color: var(--muted);
    line-height: 1.6;
}

@media (max-width: 900px) {
    .focus-header {
        grid-template-columns: 1fr auto;
    }

    .focus-live-summary {
        display: none;
    }

    .session-insight {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .focus-sidebar {
        inset: auto 10px calc(var(--footer-height) + 10px) 10px;
        width: auto;
        max-height: min(72dvh, 560px);
        transform: translateY(calc(100% + 24px));
    }

    .focus-sidebar.open {
        transform: translateY(0);
    }

    .assist-actions .action-button:not(#navigatorButton):not(#flagButton):not(#toolsButton):not(#tkaMarkReview) {
        display: none;
    }
}

@media (max-width: 640px) {
    .focus-room {
        grid-template-rows: var(--header-height) 6px minmax(0, 1fr) auto;
    }

    .session-insight {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .confidence-controls {
        width: 100%;
        justify-content: space-between;
    }

    .focus-actions {
        padding-block: 10px;
        align-items: stretch;
        flex-direction: column;
    }

    .assist-actions,
    .primary-actions {
        width: 100%;
        justify-content: space-between;
    }

    .primary-actions {
        margin-left: 0;
    }

    .primary-actions .action-button {
        flex: 1;
    }

    .command-grid,
    .review-summary,
    .review-answer-item {
        grid-template-columns: 1fr;
    }

    .review-drawer {
        padding: 10px;
        align-items: end;
    }

    .review-drawer-panel {
        height: min(82dvh, 640px);
        border-radius: 22px 22px 16px 16px;
    }
}