/* PSY101 Mind Map - Premium Design System */

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --shadow-glow: 0 0 40px rgb(139 92 246 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    --font-sans: 'Inter', sans-serif;
    --font-display: 'Outfit', sans-serif;
    --topic-intro: linear-gradient(135deg, #667eea, #764ba2);
    --topic-bio: linear-gradient(135deg, #f093fb, #f5576c);
    --topic-sensation: linear-gradient(135deg, #4facfe, #00f2fe);
    --topic-consciousness: linear-gradient(135deg, #43e97b, #38f9d7);
    --topic-learning: linear-gradient(135deg, #fa709a, #fee140);
    --topic-memory: linear-gradient(135deg, #a8edea, #fed6e3);
    --topic-cognition: linear-gradient(135deg, #5ee7df, #b490ca);
    --topic-development: linear-gradient(135deg, #d299c2, #fef9d7);
    --topic-motivation: linear-gradient(135deg, #f6d365, #fda085);
    --topic-personality: linear-gradient(135deg, #a18cd1, #fbc2eb);
    --topic-social: linear-gradient(135deg, #ffecd2, #fcb69f);
    --topic-disorders: linear-gradient(135deg, #ff9a9e, #fecfef);
    --topic-therapy: linear-gradient(135deg, #89f7fe, #66a6ff);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --shadow-glow: 0 0 60px rgb(139 92 246 / 0.4);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo .subtitle {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    margin-left: 0.5rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 150ms ease;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

.btn-icon-only {
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 50%;
}

.btn-icon-only:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.theme-icon {
    font-size: 1.25rem;
}

.main-content {
    flex: 1;
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
    width: 100%;
}

.search-container {
    margin-bottom: 1.5rem;
}

.search-wrapper {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1rem;
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    transition: all 150ms ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 4px rgb(139 92 246 / 0.1);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-kbd {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 0.375rem;
    color: var(--text-tertiary);
}

.progress-container {
    max-width: 600px;
    margin: 0 auto 2rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.progress-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.progress-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-purple);
}

.reset-btn {
    width: 24px;
    height: 24px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 150ms ease;
}

.reset-btn:hover {
    background: #ef4444;
    color: white;
    transform: rotate(-180deg);
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.mindmap-container {
    position: relative;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2.5rem 0;
}

.central-node {
    position: relative;
    z-index: 10;
    margin-bottom: 3rem;
}

.central-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    border-radius: 50%;
    box-shadow: var(--shadow-glow), var(--shadow-xl);
    cursor: pointer;
    text-align: center;
    padding: 1rem;
    transition: all var(--transition-base);
}

.central-content:hover {
    transform: scale(1.05);
    box-shadow: 0 0 60px rgb(139 92 246 / 0.5);
}

.central-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    animation: pulse 2s ease-in-out infinite;
}

.central-content h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.central-content p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
}

.pulse-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 2px solid var(--accent-purple);
    border-radius: 50%;
    opacity: 0;
    animation: pulseRing 3s ease-out infinite;
}

.pulse-ring.delay-1 {
    animation-delay: 1s;
}

.pulse-ring.delay-2 {
    animation-delay: 2s;
}

@keyframes pulseRing {
    0% {
        width: 200px;
        height: 200px;
        opacity: 0.6;
    }

    100% {
        width: 300px;
        height: 300px;
        opacity: 0;
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.branches-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 1400px;
}

.topic-branch {
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-base);
    animation: fadeInUp 0.5s ease-out backwards;
}

.topic-branch:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.topic-branch.studied::after {
    content: '✓';
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 24px;
    height: 24px;
    background: var(--accent-green);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
    z-index: 5;
}

.topic-branch.studied {
    position: relative;
}

.topic-header {
    padding: 1.25rem;
    cursor: pointer;
    position: relative;
}

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

.topic-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.topic-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.topic-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
}

.topic-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-left: calc(48px + 0.75rem);
}

.topic-expand {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-tertiary);
    transition: transform var(--transition-base);
}

.topic-branch.expanded .topic-expand {
    transform: translateY(-50%) rotate(45deg);
}

.topic-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.topic-branch.expanded .topic-content {
    max-height: 2000px;
}

.subtopics-list {
    padding: 0 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.subtopic-item {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 150ms ease;
}

.subtopic-item:hover {
    background: var(--border-color);
    transform: translateX(4px);
}

.subtopic-bullet {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.subtopic-text {
    font-size: 0.9rem;
    flex: 1;
}

.subtopic-arrow {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    opacity: 0;
    transition: opacity 150ms;
}

.subtopic-item:hover .subtopic-arrow {
    opacity: 1;
}

.detail-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 500px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    z-index: 200;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    box-shadow: -10px 0 40px rgb(0 0 0 / 0.1);
}

.detail-panel.open {
    transform: translateX(0);
}

.detail-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 150ms;
}

.detail-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.detail-content {
    padding: 2rem;
}

.detail-header {
    margin-bottom: 1.5rem;
}

.detail-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.detail-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.detail-breadcrumb {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.detail-section {
    margin-bottom: 1.5rem;
}

.detail-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
}

.detail-description {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

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

.detail-list li {
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    gap: 0.5rem;
}

.detail-list li::before {
    content: '•';
    color: var(--accent-purple);
    font-weight: bold;
}

.key-terms {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.key-term {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    transition: all 150ms;
    cursor: pointer;
    border: 1px solid transparent;
    position: relative;
}

.key-term:hover {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgb(139 92 246 / 0.3);
}

.key-term::after {
    content: '?';
    position: absolute;
    top: -4px;
    right: -4px;
    width: 16px;
    height: 16px;
    background: var(--accent-purple);
    color: white;
    border-radius: 50%;
    font-size: 0.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: all 150ms ease;
}

.key-term:hover::after {
    opacity: 1;
    transform: scale(1);
}

/* Term Definition Tooltip */
.tooltip-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 300;
    opacity: 0;
    visibility: hidden;
    transition: all 200ms ease;
    backdrop-filter: blur(4px);
}

.tooltip-overlay.active {
    opacity: 1;
    visibility: visible;
}

.term-tooltip {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 420px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    z-index: 350;
    opacity: 0;
    visibility: hidden;
    transition: all 250ms cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

.term-tooltip.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.term-tooltip-header {
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.term-tooltip-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
}

.term-tooltip-close {
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 150ms ease;
}

.term-tooltip-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.term-tooltip-definition {
    padding: 1.25rem;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.footer {
    text-align: center;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.topic-branch:nth-child(1) {
    animation-delay: 0.05s;
}

.topic-branch:nth-child(2) {
    animation-delay: 0.1s;
}

.topic-branch:nth-child(3) {
    animation-delay: 0.15s;
}

.topic-branch:nth-child(4) {
    animation-delay: 0.2s;
}

.topic-branch:nth-child(5) {
    animation-delay: 0.25s;
}

.topic-branch:nth-child(6) {
    animation-delay: 0.3s;
}

.topic-branch:nth-child(7) {
    animation-delay: 0.35s;
}

.topic-branch:nth-child(8) {
    animation-delay: 0.4s;
}

.topic-branch:nth-child(9) {
    animation-delay: 0.45s;
}

.topic-branch:nth-child(10) {
    animation-delay: 0.5s;
}

.topic-branch:nth-child(11) {
    animation-delay: 0.55s;
}

.topic-branch:nth-child(12) {
    animation-delay: 0.6s;
}

.topic-branch:nth-child(13) {
    animation-delay: 0.65s;
}

@media (max-width: 768px) {
    .logo .subtitle {
        display: none;
    }

    .branches-container {
        grid-template-columns: 1fr;
    }

    .central-content {
        width: 160px;
        height: 160px;
    }

    .detail-panel {
        max-width: 100%;
    }

    .search-kbd {
        display: none;
    }
}

.hidden {
    display: none !important;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
}

.search-highlight {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(236, 72, 153, 0.3));
    padding: 0 2px;
    border-radius: 2px;
}

[data-topic="intro"] .topic-icon,
[data-topic="intro"] .subtopic-bullet,
[data-topic="intro"] .detail-icon {
    background: var(--topic-intro);
}

[data-topic="bio"] .topic-icon,
[data-topic="bio"] .subtopic-bullet,
[data-topic="bio"] .detail-icon {
    background: var(--topic-bio);
}

[data-topic="sensation"] .topic-icon,
[data-topic="sensation"] .subtopic-bullet,
[data-topic="sensation"] .detail-icon {
    background: var(--topic-sensation);
}

[data-topic="consciousness"] .topic-icon,
[data-topic="consciousness"] .subtopic-bullet,
[data-topic="consciousness"] .detail-icon {
    background: var(--topic-consciousness);
}

[data-topic="learning"] .topic-icon,
[data-topic="learning"] .subtopic-bullet,
[data-topic="learning"] .detail-icon {
    background: var(--topic-learning);
}

[data-topic="memory"] .topic-icon,
[data-topic="memory"] .subtopic-bullet,
[data-topic="memory"] .detail-icon {
    background: var(--topic-memory);
}

[data-topic="cognition"] .topic-icon,
[data-topic="cognition"] .subtopic-bullet,
[data-topic="cognition"] .detail-icon {
    background: var(--topic-cognition);
}

[data-topic="development"] .topic-icon,
[data-topic="development"] .subtopic-bullet,
[data-topic="development"] .detail-icon {
    background: var(--topic-development);
}

[data-topic="motivation"] .topic-icon,
[data-topic="motivation"] .subtopic-bullet,
[data-topic="motivation"] .detail-icon {
    background: var(--topic-motivation);
}

[data-topic="personality"] .topic-icon,
[data-topic="personality"] .subtopic-bullet,
[data-topic="personality"] .detail-icon {
    background: var(--topic-personality);
}

[data-topic="social"] .topic-icon,
[data-topic="social"] .subtopic-bullet,
[data-topic="social"] .detail-icon {
    background: var(--topic-social);
}

[data-topic="disorders"] .topic-icon,
[data-topic="disorders"] .subtopic-bullet,
[data-topic="disorders"] .detail-icon {
    background: var(--topic-disorders);
}

[data-topic="therapy"] .topic-icon,
[data-topic="therapy"] .subtopic-bullet,
[data-topic="therapy"] .detail-icon {
    background: var(--topic-therapy);
}

[data-topic="intro"] .topic-header::before {
    background: var(--topic-intro);
}

[data-topic="bio"] .topic-header::before {
    background: var(--topic-bio);
}

[data-topic="sensation"] .topic-header::before {
    background: var(--topic-sensation);
}

[data-topic="consciousness"] .topic-header::before {
    background: var(--topic-consciousness);
}

[data-topic="learning"] .topic-header::before {
    background: var(--topic-learning);
}

[data-topic="memory"] .topic-header::before {
    background: var(--topic-memory);
}

[data-topic="cognition"] .topic-header::before {
    background: var(--topic-cognition);
}

[data-topic="development"] .topic-header::before {
    background: var(--topic-development);
}

[data-topic="motivation"] .topic-header::before {
    background: var(--topic-motivation);
}

[data-topic="personality"] .topic-header::before {
    background: var(--topic-personality);
}

[data-topic="social"] .topic-header::before {
    background: var(--topic-social);
}

[data-topic="disorders"] .topic-header::before {
    background: var(--topic-disorders);
}

[data-topic="therapy"] .topic-header::before {
    background: var(--topic-therapy);
}

/* ================================================
   Quiz System Styles
   ================================================ */

/* Quiz Button (Brain Icon) */
.quiz-btn {
    width: 24px;
    height: 24px;
    border: none;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    border-radius: 50%;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    transition: all 150ms ease;
    flex-shrink: 0;
    margin-left: 0.5rem;
    opacity: 0.7;
}

.quiz-btn:hover {
    transform: scale(1.15);
    opacity: 1;
    box-shadow: 0 4px 12px rgb(139 92 246 / 0.4);
}

.quiz-btn.completed {
    background: var(--accent-green);
    opacity: 1;
}

.quiz-btn.completed::after {
    content: '✓';
    color: white;
    font-size: 0.7rem;
    font-weight: bold;
}

/* Key Point with Quiz Button */
.detail-list li {
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.detail-list li::before {
    content: '•';
    color: var(--accent-purple);
    font-weight: bold;
    flex-shrink: 0;
}

.key-point-text {
    flex: 1;
}

.key-point-wrapper {
    display: flex;
    align-items: center;
    width: 100%;
}

/* Key Term with Quiz Button */
.key-term-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Quiz Modal */
.quiz-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 480px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    z-index: 400;
    opacity: 0;
    visibility: hidden;
    transition: all 250ms cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

.quiz-modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.quiz-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 350;
    opacity: 0;
    visibility: hidden;
    transition: all 200ms ease;
    backdrop-filter: blur(4px);
}

.quiz-overlay.active {
    opacity: 1;
    visibility: visible;
}

.quiz-header {
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.quiz-header-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
}

.quiz-header-icon {
    font-size: 1.25rem;
}

.quiz-close {
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 150ms ease;
}

.quiz-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.quiz-content {
    padding: 1.5rem;
}

.quiz-question {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-option {
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    text-align: left;
    transition: all 150ms ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--accent-purple);
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.quiz-option-letter {
    width: 28px;
    height: 28px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--accent-purple);
    flex-shrink: 0;
}

.quiz-option.correct {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--accent-green);
}

.quiz-option.correct .quiz-option-letter {
    background: var(--accent-green);
    color: white;
}

.quiz-option.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border-color: #ef4444;
}

.quiz-option.incorrect .quiz-option-letter {
    background: #ef4444;
    color: white;
}

.quiz-option:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.quiz-result {
    margin-top: 1.25rem;
    padding: 1rem;
    border-radius: var(--radius-lg);
    text-align: center;
    font-weight: 500;
    animation: fadeInUp 0.3s ease-out;
}

.quiz-result.correct {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
}

.quiz-result.incorrect {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.quiz-result-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Progress bar animation for quiz completion */
@keyframes progressPulse {
    0% {
        box-shadow: 0 0 0 0 rgb(139 92 246 / 0.4);
    }

    70% {
        box-shadow: 0 0 0 10px rgb(139 92 246 / 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgb(139 92 246 / 0);
    }
}

.progress-container.pulse {
    animation: progressPulse 0.6s ease-out;
}

/* Quiz button in key terms */
.key-term-quiz-btn {
    width: 18px;
    height: 18px;
    font-size: 0.6rem;
    margin-left: 0.25rem;
    vertical-align: middle;
}