/* ===== CSS Variables ===== */
:root {
    /* Calming color palette */
    --color-primary: #4A90A4;
    --color-primary-dark: #3A7A8E;
    --color-primary-light: #6FB3C9;
    --color-secondary: #7CB8A8;
    --color-accent: #E8B86D;

    /* Neutral colors */
    --color-bg: #F7F9FC;
    --color-bg-alt: #FFFFFF;
    --color-text: #2D3748;
    --color-text-light: #4A5568;
    --color-text-muted: #718096;
    --color-border: #E2E8F0;

    /* Severity colors */
    --color-minimal: #48BB78;
    --color-mild: #68D391;
    --color-moderate: #ECC94B;
    --color-severe: #F6AD55;
    --color-critical: #FC8181;
    --color-warning: #ED8936;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-3xl); margin-bottom: var(--spacing-lg); }
h2 { font-size: var(--font-size-2xl); margin-bottom: var(--spacing-md); }
h3 { font-size: var(--font-size-xl); margin-bottom: var(--spacing-md); }
h4 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-sm); }

p {
    margin-bottom: var(--spacing-md);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    color: white;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-primary);
    color: white;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ===== Header ===== */
.site-header {
    background-color: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.logo:hover {
    color: var(--color-primary-dark);
}

.logo-icon {
    display: flex;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--color-primary);
}

.lang-switch .lang-link {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.lang-switch .lang-link:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-secondary) 100%);
    padding: var(--spacing-2xl) 0;
    text-align: center;
    color: white;
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    opacity: 0.95;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    opacity: 0.9;
}

.hero .btn-primary {
    background-color: white;
    color: var(--color-primary);
}

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

/* ===== Disclaimer Section ===== */
.disclaimer-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg);
}

.disclaimer-box {
    background-color: #FEF3C7;
    border: 2px solid #F59E0B;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.disclaimer-box h3 {
    color: #B45309;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.disclaimer-box h3::before {
    content: "⚠";
    font-size: var(--font-size-xl);
}

.disclaimer-box p {
    color: #92400E;
    margin-bottom: 0;
    line-height: var(--line-height-relaxed);
}

/* ===== Features Section ===== */
.features {
    padding: var(--spacing-2xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

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

.feature-icon {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* ===== Methodology Section ===== */
.methodology {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg-alt);
}

.methodology h2 {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.methodology-intro {
    text-align: center;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.instruments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.instrument-category {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.instrument-category:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.instrument-category h3 {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary-light);
}

.instrument-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.instrument-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    transition: background-color var(--transition-fast);
}

.instrument-list li:hover {
    background-color: rgba(74, 144, 164, 0.05);
}

.instrument-list li strong {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 80px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    font-weight: 600;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(74, 144, 164, 0.3);
}

.instrument-list li span {
    flex: 1;
    line-height: 1.4;
}

/* ===== CTA Section ===== */
.cta {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

.cta-content {
    text-align: center;
}

.cta h2 {
    color: var(--color-critical);
}

.crisis-contacts {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.crisis-link {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-critical);
}

/* ===== Footer ===== */
.site-footer {
    background-color: var(--color-text);
    color: var(--color-bg);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    text-align: center;
}

.footer-disclaimer {
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

.footer-crisis {
    margin-bottom: var(--spacing-md);
}

.footer-crisis a {
    color: var(--color-accent);
}

.footer-bottom {
    opacity: 0.6;
    font-size: var(--font-size-sm);
}

/* ===== Quiz Styles ===== */
.page-content {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

.hidden {
    display: none !important;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.modal-content h2 {
    color: var(--color-warning);
}

.modal-content p {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

/* Quiz Wrapper */
.quiz-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.quiz-header h2 {
    color: var(--color-primary);
}

.quiz-instructions {
    color: var(--color-text-light);
}

.assessment-indicator {
    display: inline-block;
    background-color: var(--color-primary-light);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    height: 8px;
    background-color: var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

.progress-text {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Question Card */
.question-card {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.question-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-label {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-label:hover {
    border-color: var(--color-primary-light);
    background-color: var(--color-bg);
}

.option-label.selected {
    border-color: var(--color-primary);
    background-color: rgba(74, 144, 164, 0.1);
}

.option-label input {
    margin-right: var(--spacing-md);
    accent-color: var(--color-primary);
    width: 20px;
    height: 20px;
}

.option-text {
    flex: 1;
}

/* Quiz Navigation */
.quiz-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

/* ===== Results Styles ===== */
.results-wrapper,
.final-results-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.results-wrapper h2,
.final-results-wrapper h2 {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
}

.results-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.result-item {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.result-item.flagged {
    border-left: 4px solid var(--color-warning);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.result-category {
    font-weight: 600;
}

.result-score {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.result-bar {
    height: 8px;
    background-color: var(--color-border);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.result-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal);
}

.result-fill.normal {
    background-color: var(--color-minimal);
}

.result-fill.warning {
    background-color: var(--color-warning);
}

.threshold-marker {
    position: absolute;
    top: -2px;
    bottom: -2px;
    width: 2px;
    background-color: var(--color-critical);
}

/* Flagged Section */
.flagged-section {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.flagged-section h3 {
    color: var(--color-warning);
}

.selection-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.level2-selection {
    display: grid;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.checkbox-label input {
    margin-right: var(--spacing-md);
    accent-color: var(--color-primary);
    width: 20px;
    height: 20px;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.no-concerns {
    text-align: center;
    padding: var(--spacing-xl);
}

/* ===== Final Results ===== */
.disclaimer-banner {
    background-color: #FEF3C7;
    border: 1px solid #F59E0B;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}

.disclaimer-banner strong {
    color: #B45309;
}

.crisis-banner {
    background-color: #FEE2E2;
    border: 1px solid var(--color-critical);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.crisis-banner h3 {
    color: #B91C1C;
    margin-bottom: var(--spacing-sm);
}

.crisis-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.crisis-links .crisis-link {
    background-color: var(--color-critical);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.results-grid-final {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.final-result-card {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.final-result-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.final-result-card.flagged {
    border-left: 4px solid var(--color-warning);
}

.score-display {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.score-value {
    font-weight: 700;
    color: var(--color-primary);
}

.score-max {
    color: var(--color-text-muted);
}

.severity-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.severity-badge.severity-minimal,
.severity-badge.severity-low,
.severity-badge.severity-none,
.severity-badge.severity-negative,
.severity-badge.severity-low_risk {
    background-color: #D1FAE5;
    color: #065F46;
}

.severity-badge.severity-mild,
.severity-badge.severity-subthreshold,
.severity-badge.severity-subclinical {
    background-color: #D1FAE5;
    color: #065F46;
}

.severity-badge.severity-moderate,
.severity-badge.severity-hazardous {
    background-color: #FEF3C7;
    color: #92400E;
}

.severity-badge.severity-moderately_severe,
.severity-badge.severity-harmful,
.severity-badge.severity-positive,
.severity-badge.severity-clinical,
.severity-badge.severity-elevated {
    background-color: #FED7AA;
    color: #9A3412;
}

.severity-badge.severity-severe,
.severity-badge.severity-high,
.severity-badge.severity-dependence {
    background-color: #FECACA;
    color: #991B1B;
}

.result-fill.severity-minimal,
.result-fill.severity-low,
.result-fill.severity-none,
.result-fill.severity-negative,
.result-fill.severity-low_risk {
    background-color: var(--color-minimal);
}

.result-fill.severity-mild,
.result-fill.severity-subthreshold,
.result-fill.severity-subclinical {
    background-color: var(--color-mild);
}

.result-fill.severity-moderate,
.result-fill.severity-hazardous {
    background-color: var(--color-moderate);
}

.result-fill.severity-moderately_severe,
.result-fill.severity-harmful,
.result-fill.severity-positive,
.result-fill.severity-clinical,
.result-fill.severity-elevated {
    background-color: var(--color-severe);
}

.result-fill.severity-severe,
.result-fill.severity-high,
.result-fill.severity-dependence {
    background-color: var(--color-critical);
}

.screening-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: var(--spacing-sm);
    margin-bottom: 0;
}

.interpretation-section,
.recommendations-section,
.resources-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.interpretation-section h4,
.recommendations-section h4,
.resources-section h4 {
    color: var(--color-text);
    font-size: var(--font-size-base);
}

.interpretation-section p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

.recommendations-section ul {
    list-style: none;
    padding: 0;
}

.recommendations-section li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.recommendations-section li::before {
    content: '•';
    color: var(--color-primary);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.resource-list {
    list-style: none;
    padding: 0;
}

.resource-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.resource-list li:last-child {
    border-bottom: none;
}

.resource-list a {
    font-weight: 500;
}

.resource-desc {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ===== YSQ Schema Results ===== */
.ysq-card .schemas-section {
    margin-top: var(--spacing-lg);
}

.ysq-card .schemas-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.schemas-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.schema-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg);
}

.schema-item.severity-moderate {
    border-left: 3px solid var(--color-warning);
}

.schema-item.severity-high {
    border-left: 3px solid var(--color-severe);
}

.schema-name {
    font-weight: 500;
}

.schema-score {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    background-color: var(--color-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.no-active-schemas {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--spacing-lg);
    font-style: italic;
}

/* ===== Print Styles ===== */
@media print {
    .site-header,
    .site-footer,
    .action-buttons,
    .quiz-nav {
        display: none !important;
    }

    body {
        background: white;
    }

    .final-result-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.25rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-bg-alt);
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .quiz-nav {
        flex-direction: column-reverse;
    }

    .quiz-nav .btn {
        width: 100%;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }

    .question-card {
        padding: var(--spacing-lg);
    }

    .selection-controls {
        flex-direction: column;
    }

    .instruments-grid {
        grid-template-columns: 1fr;
    }

    .instrument-category {
        padding: var(--spacing-md);
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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