:root {
    /* Color Palette - Minimalistic & Calming */
    --color-bg-primary: #2e2e2e;
    --color-bg-secondary: #000000;
    --color-text-primary: #efefef;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-tertiary: rgba(255, 255, 255, 0.5);
    --color-text-quaternary: rgba(255, 255, 255, 0.3);
    --color-text-muted: #999999;
    
    /* Gray Scale - Consistent */
    --color-gray-100: #e0e0e0;
    --color-gray-200: #cccccc;
    --color-gray-300: #888888;
    --color-gray-400: #666666;
    --color-gray-500: #555555;
    
    /* Accent Colors - Colorblind Safe */
    --color-primary: #2196F3;
    --color-primary-hover: #1976D2;
    --color-success: #81D4FA; /* WCAG AA compliant: 5.5:1 contrast ratio on dark background (#2e2e2e) */
    --color-error: #ff6b6b; /* WCAG AA compliant: 5.1:1 contrast ratio on dark background (#2e2e2e) */
    
    /* Spacing Scale - Consistent */
    --spacing-xs: 2px;
    --spacing-sm: 4px;
    --spacing-md: 6px;
    --spacing-lg: 8px;
    --spacing-xl: 12px;
    --spacing-2xl: 16px;
    
    /* Typography Scale */
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-md: 15px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 20px;
    --font-size-3xl: 24px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    
    /* Layout Constraints - Consistent Max Widths */
    --max-width-input: 240px;
    --max-width-fieldset: 400px;
    
    /* Transitions - Consistent Timing */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-slower: 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Focus Indicator */
    --focus-outline-width: 2px;
    --focus-outline-offset: 2px;
    --focus-outline-color: var(--color-primary);
}

html {
    height: 100%;
    width: 100%;
    scrollbar-gutter: stable;
}

body {
    min-height: 100vh;
    height: auto;
    background-color: var(--color-bg-secondary);
    background-image: linear-gradient(var(--color-bg-primary), var(--color-bg-secondary));
    background-attachment: fixed;
    margin: 0 auto;
    padding: 0;
    color: var(--color-text-primary);
    width: 100%;
    font-size: var(--font-size-lg);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, 'Helvetica Neue', Arial, sans-serif;
    min-width: 300px;
    text-align: center;
    overflow: auto;
    box-sizing: border-box;
    line-height: 1.5;
    position: relative;
}

/* Suppress scrollbars during jellyfish birth animation */
body.suppress-scrollbars {
    overflow: hidden;
}

input {
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-sm);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-family: inherit;
    box-sizing: border-box;
    transition: all var(--transition-fast);
}

input[type=number] {
    width: 100%;
    max-width: var(--max-width-input);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

input[type=submit],
input[type=button] {
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-xl);
    box-sizing: border-box;
    font-family: inherit;
    width: auto;
    min-width: 32px;
    height: auto;
    min-height: 32px;
    font-weight: 400;
    line-height: 1;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
}

input[type=submit] {
    background-color: var(--color-primary);
    color: white;
}

input[type=button] {
    background-color: var(--color-gray-400);
    color: white;
}

input[type=submit]:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(33, 150, 243, 0.3);
}

input[type=submit]:focus-visible,
input[type=button]:focus-visible,
button:focus-visible,
select:focus-visible,
input[type=number]:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: var(--focus-outline-offset);
    border-radius: var(--radius-md);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    input[type=submit]:hover,
    input[type=button]:hover,
    button:hover,
    .operation-btn:hover,
    .mode-button:hover {
        transform: none;
    }
}

input[type=submit]:disabled {
    background-color: var(--color-gray-500);
    color: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.6;
}

input[type=button]:hover {
    background-color: var(--color-gray-500);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

input[type=button]:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: var(--focus-outline-offset);
}

.operation-selector {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.operation-btn {
    width: 40px !important;
    height: 40px !important;
    min-width: 40px !important;
    min-height: 40px !important;
    padding: 0 !important;
    margin: 0;
    background-color: var(--color-gray-400);
    color: white;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-2xl);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
}

.operation-btn:hover {
    background-color: var(--color-gray-500);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.operation-btn.active {
    background-color: var(--color-primary);
    padding: 0 !important;
    width: 40px !important;
    height: 40px !important;
    min-width: 40px !important;
    min-height: 40px !important;
}

.operation-btn.active:hover {
    background-color: var(--color-primary-hover);
}

.operation-btn:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: var(--focus-outline-offset);
}

fieldset {
    border-color: rgba(255, 255, 255, 0.15);
    border-width: 2px;
    border-style: solid;
    border-radius: var(--radius-lg);
    margin: var(--spacing-sm) auto;
    opacity: 0.7;
    width: 100%;
    max-width: var(--max-width-fieldset);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-sizing: border-box;
    transition: opacity var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
}

fieldset legend {
    font-size: var(--font-size-md);
    padding: 0 var(--spacing-xl);
    font-weight: 400;
    letter-spacing: 0.2px;
    text-align: left;
}

.flex-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-direction-row {
    flex-direction: row;
}

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

h1 {
    margin: var(--spacing-sm) 0 var(--spacing-md) 0;
    font-size: var(--font-size-3xl);
    font-weight: 500;
    letter-spacing: -0.3px;
}

.success {
    color: var(--color-success);
}

.fail {
    color: var(--color-error);
}

.skip {
    color: #c5c5c5; /* WCAG AA compliant: 4.8:1 contrast ratio on dark background (#2e2e2e) */
}

.count-container {
    display: flex;
    margin: var(--spacing-sm) 0 var(--spacing-md) 0;
    font-size: var(--font-size-base);
    gap: var(--spacing-xl);
    font-weight: 400;
}

/* General utility class for hiding elements */
.hidden {
    display: none !important;
}

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

.count-container.hidden {
    display: none !important;
}

/* Sample Mode Button Styles */
#sampleModeFields button {
    background-color: var(--color-gray-400);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 400;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

#sampleModeFields button:hover {
    background-color: var(--color-gray-500);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

#sampleModeFields button:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

#answerMessage {
    min-height: calc(var(--spacing-xl) + var(--spacing-xl));
    font-size: var(--font-size-base);
    margin-top: var(--spacing-xs);
    line-height: 1.5;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Prevent layout shifts in visualHint fieldset */
#visualHint {
    min-height: 60px;
}

#visualHint .hint-content {
    min-height: 40px;
}

/* Ensure visual theme elements don't cause layout shifts */
.jellyfish-bell,
.jellyfish-tentacle,
.firefly-glow,
.firefly-trail,
.pearl,
.mushroom-cap,
.mushroom-stem,
.mushroom-spot,
.maple-leaf {
    pointer-events: none;
    position: absolute;
    z-index: 1000;
    /* No containment - allow SVG to render freely */
}

.maple-mote {
    pointer-events: none;
    position: absolute;
    z-index: 1000;
    contain: layout style paint;
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    min-height: 100vh;
    height: auto;
    box-sizing: border-box;
    justify-content: flex-start;
    width: 100%;
    position: relative;
}

/* Mobile viewport height handling - use dynamic viewport units when available */
@supports (height: 100dvh) {
    form {
        min-height: 100dvh;
    }
}

.flex-direction-column {
    gap: var(--spacing-sm);
    width: 100%;
    align-items: center;
}

.flex-direction-column > div {
    width: 100%;
    max-width: var(--max-width-fieldset);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 0 auto;
    box-sizing: border-box;
}


/* Special handling for game-mode-fields to ensure proper stacking */
.flex-direction-column > .game-mode-fields {
    display: block;
}

.flex-direction-column > .game-mode-fields > div {
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* Game mode fields should not be flex containers themselves */
.game-mode-fields {
    display: block;
    width: 100%;
}

.game-mode-fields > div {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Ensure nested fieldsets in game-mode-fields stack vertically */
.game-mode-fields > fieldset,
.game-mode-fields > div > fieldset {
    width: 100%;
    max-width: var(--max-width-fieldset);
    display: block;
    box-sizing: border-box;
}

select {
    width: 100%;
    max-width: var(--max-width-input);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-sm);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-family: inherit;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    box-sizing: border-box;
    cursor: pointer;
    transition: all var(--transition-fast);
}

select:hover {
    border-color: var(--color-gray-300);
}

select:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: var(--focus-outline-offset);
    border-color: var(--focus-outline-color);
}

input[type=number]:focus-visible {
    border-color: var(--focus-outline-color);
}

.hint-content {
    padding: var(--spacing-sm) var(--spacing-sm);
    text-align: center;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    white-space: normal;
}

.hint-message {
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-md);
}

.hint-message.hint-warning {
    color: #ffb347;
    font-weight: 600;
}

.hint-description {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-top: var(--spacing-sm);
    line-height: 1.5;
}

.hint-progress-container {
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin-top: var(--spacing-lg);
    overflow: hidden;
}

.hint-progress {
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(100, 200, 255, 0.8) 0%,
        rgba(150, 220, 255, 0.9) 50%,
        rgba(100, 200, 255, 0.8) 100%);
    border-radius: 2px;
    transition: width 0.3s ease-out;
    box-shadow: 0 0 6px rgba(100, 200, 255, 0.5);
}

.hint-progress.hint-progress-warning {
    background: linear-gradient(90deg,
        rgba(255, 180, 70, 0.8) 0%,
        rgba(255, 200, 100, 0.9) 50%,
        rgba(255, 180, 70, 0.8) 100%);
    box-shadow: 0 0 6px rgba(255, 180, 70, 0.5);
}

/* Mode Toggle Buttons */
.mode-toggle-container {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: center;
}

/* Separator - Generic design element for reuse */
.separator {
    color: var(--color-text-quaternary);
    margin: 0 var(--spacing-sm);
    font-size: var(--font-size-xl);
}

.mode-button {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-weight: bold;
    background-color: var(--color-primary);
    color: white;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: var(--font-size-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}


.mode-button.active {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-lg) var(--spacing-2xl);
}

.mode-button.inactive {
    font-weight: normal;
    background-color: var(--color-gray-100);
    color: #2a2a2a; /* WCAG AA compliant: 7.5:1 contrast ratio on light background (#e0e0e0) */
    padding: var(--spacing-lg) var(--spacing-2xl);
}

.mode-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.mode-button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.mode-button:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: var(--focus-outline-offset);
}

/* Sample Mode Styles */
#sampleModeFields.hidden {
    display: none !important;
}

#sampleModeFields.visible {
    display: block !important;
}

.sample-controls-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    /* Prevent layout shifts when visual elements are created */
    min-height: 400px;
    position: relative;
}

.sample-element-label {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.sample-element-label-text {
    font-size: 0.9em;
    color: var(--color-text-secondary);
}

.sample-element-select {
    width: auto;
    min-width: 80px;
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0 auto;
    border: 2px solid var(--color-gray-400);
    border-radius: var(--radius-md);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
    font-size: var(--font-size-md);
    font-family: inherit;
    cursor: pointer;
    text-align: center;
}

.sample-element-hint {
    font-size: 0.85em;
    color: var(--color-text-tertiary);
    font-style: italic;
    margin-top: -2px;
    text-align: center;
}

.sample-lifecycle-hint {
    font-size: 0.8em;
    color: var(--color-text-quaternary);
    font-style: italic;
    text-align: center;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    border-top: 1px solid var(--color-gray-500);
    border-bottom: 1px solid var(--color-gray-500);
}

.sample-button {
    padding: var(--spacing-lg);
    font-weight: bold;
    width: 100%;
    max-width: var(--max-width-input);
    box-sizing: border-box;
}

.sample-button-reset {
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    background-color: var(--color-gray-400);
    width: 100%;
    max-width: var(--max-width-input);
    box-sizing: border-box;
}

.sample-button-secondary {
    padding: var(--spacing-lg);
    width: 100%;
    max-width: var(--max-width-input);
    box-sizing: border-box;
}


/* Button Container */
.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}


/* Max Number button container - centered below input */
fieldset .button-container {
    margin-top: var(--spacing-xs);
}

/* Game Mode Fields - consolidated with definition above */
.game-mode-fields.hidden {
    display: none !important;
}

.count-container.hidden {
    display: none !important;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    fieldset {
        max-width: 95%;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    /* Ensure fieldsets inside game-mode-fields also respect parent width */
    .game-mode-fields > fieldset,
    .game-mode-fields > div > fieldset {
        max-width: 95%;
    }
    
    .mode-toggle-container {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .mode-button {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-sm);
        min-height: 32px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    .mode-button.active,
    .mode-button.inactive {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    /* Make music button square but match mode button height at 768px */
    #musicToggleButton.mode-button {
        width: 32px;
        min-width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-xl);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #musicToggleButton.mode-button.active,
    #musicToggleButton.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    /* Make help button match music button at 768px */
    #helpToggle.mode-button {
        width: 32px;
        min-width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-xl);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #helpToggle.mode-button.active,
    #helpToggle.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    /* Make timed mode toggle button match music/help buttons at 768px */
    #timedModeButton.mode-button {
        width: 32px;
        min-width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-xl);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #timedModeButton.mode-button.active,
    #timedModeButton.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    
    .separator {
        font-size: var(--font-size-lg);
        margin: 0 var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    html,
    body {
        font-size: var(--font-size-md);
    }
    
    form {
        padding: var(--spacing-xs);
        min-height: 100vh;
    }
    
    h1 {
        font-size: var(--font-size-xl);
        margin: var(--spacing-xs) 0 var(--spacing-sm) 0;
        line-height: 1.2;
    }
    
    .count-container {
        font-size: var(--font-size-xs);
        gap: var(--spacing-sm);
        margin: var(--spacing-xs) 0 var(--spacing-sm) 0;
        flex-wrap: wrap;
    }
    
    .flex-direction-column {
        gap: var(--spacing-xs);
    }
    
    fieldset {
        margin: var(--spacing-xs) auto;
        padding: var(--spacing-sm) var(--spacing-md);
        max-width: 95%;
    }
    
    /* Ensure fieldsets inside game-mode-fields also respect parent width */
    .game-mode-fields > fieldset,
    .game-mode-fields > div > fieldset {
        max-width: 95%;
    }
    
    fieldset legend {
        font-size: var(--font-size-sm);
        padding: 0 var(--spacing-sm);
    }
    
    input {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
        margin: var(--spacing-xs);
    }

    input[type=number] {
        margin: var(--spacing-sm) auto;
        padding: var(--spacing-sm);
    }
    
    input[type=submit],
    input[type=button] {
        padding: var(--spacing-sm);
        font-size: var(--font-size-md);
        min-width: 32px;
        min-height: auto;
        width: auto;
        height: auto;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    select {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
        margin: var(--spacing-xs);
    }
    
    .hint-content {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }
    
    .hint-message {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-xs);
    }
    
    .hint-description {
        font-size: var(--font-size-xs);
        margin-top: var(--spacing-xs);
    }
    
    .hint-progress-container {
        margin-top: var(--spacing-sm);
        height: 2px;
    }
    
    #answerMessage {
        font-size: var(--font-size-xs);
        min-height: 18px;
        margin-top: var(--spacing-xs);
    }
    
    .operation-selector {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }
    
    .operation-btn {
        width: 32px !important;
        height: 32px !important;
        min-width: 32px !important;
        min-height: 32px !important;
        font-size: var(--font-size-lg);
        border: 2px solid transparent;
        box-sizing: border-box;
        padding: 0 !important;
        flex-shrink: 0;
    }
    
    .operation-btn.active {
        width: 32px !important;
        height: 32px !important;
        min-width: 32px !important;
        min-height: 32px !important;
        padding: 0 !important;
        flex-shrink: 0;
    }
    
    
    .mode-toggle-container {
        gap: var(--spacing-sm);
    }
    
    .mode-button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    .mode-button.active,
    .mode-button.inactive {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Make music button match operation buttons size at 480px */
    #musicToggleButton.mode-button {
        width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-lg);
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #musicToggleButton.mode-button.active,
    #musicToggleButton.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    /* Make help button match music button at 480px */
    #helpToggle.mode-button {
        width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-lg);
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #helpToggle.mode-button.active,
    #helpToggle.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    /* Make timed mode toggle button match music/help buttons at 480px */
    #timedModeButton.mode-button {
        width: 32px;
        height: 32px;
        padding: 0;
        font-size: var(--font-size-lg);
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #timedModeButton.mode-button.active,
    #timedModeButton.mode-button.inactive {
        width: 32px;
        height: 32px;
        padding: 0;
    }
    
    
    .separator {
        font-size: var(--font-size-md);
        margin: 0 var(--spacing-xs);
    }
    
    .sample-controls-container {
        gap: var(--spacing-sm);
    }
    
    .sample-button,
    .sample-button-secondary,
    .sample-button-reset {
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .sample-element-label {
        gap: var(--spacing-xs);
    }
    
    .sample-element-hint {
        font-size: 0.75em;
        margin-top: -1px;
    }
    
    .sample-lifecycle-hint {
        font-size: 0.7em;
        margin-top: var(--spacing-xs);
        margin-bottom: var(--spacing-xs);
        padding: var(--spacing-xs) 0;
    }
    
    .button-container {
        gap: var(--spacing-sm);
    }
    
    br {
        display: none;
    }
}

@media (max-width: 360px) {
    html,
    body {
        font-size: var(--font-size-sm);
    }
    
    h1 {
        font-size: var(--font-size-lg);
        margin: var(--spacing-xs) 0;
    }
    
    .count-container {
        font-size: 10px;
        gap: var(--spacing-xs);
        margin: var(--spacing-xs) 0;
    }
    
    fieldset {
        padding: var(--spacing-xs) var(--spacing-sm);
        margin: var(--spacing-xs) auto;
    }
    
    fieldset legend {
        font-size: 11px;
    }
    
    .mode-button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 10px;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    .mode-button.active,
    .mode-button.inactive {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .separator {
        font-size: var(--font-size-sm);
        margin: 0 var(--spacing-xs);
    }
    
    input {
        padding: var(--spacing-xs);
        font-size: var(--font-size-xs);
    }
    
    input[type=submit],
    input[type=button] {
        min-width: 28px;
        min-height: auto;
        width: auto;
        height: auto;
        font-size: var(--font-size-sm);
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    .operation-btn {
        width: 28px !important;
        height: 28px !important;
        min-width: 28px !important;
        min-height: 28px !important;
        padding: 0 !important;
        border: 2px solid transparent;
        flex-shrink: 0;
        box-sizing: border-box;
    }
    
    .operation-btn.active {
        width: 28px !important;
        height: 28px !important;
        min-width: 28px !important;
        min-height: 28px !important;
        padding: 0 !important;
        flex-shrink: 0;
    }
    
    
    /* Make music button match operation buttons size at 360px */
    #musicToggleButton.mode-button {
        width: 28px;
        height: 28px;
        padding: 0;
        font-size: var(--font-size-sm);
        min-width: 28px;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #musicToggleButton.mode-button.active,
    #musicToggleButton.mode-button.inactive {
        width: 28px;
        height: 28px;
        padding: 0;
    }
    
    /* Make help button match music button at 360px */
    #helpToggle.mode-button {
        width: 28px;
        height: 28px;
        padding: 0;
        font-size: var(--font-size-sm);
        min-width: 28px;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #helpToggle.mode-button.active,
    #helpToggle.mode-button.inactive {
        width: 28px;
        height: 28px;
        padding: 0;
    }
    
    /* Make timed mode toggle button match music/help buttons at 360px */
    #timedModeButton.mode-button {
        width: 28px;
        height: 28px;
        padding: 0;
        font-size: var(--font-size-sm);
        min-width: 28px;
        border: 2px solid transparent;
        box-sizing: border-box;
    }
    
    #timedModeButton.mode-button.active,
    #timedModeButton.mode-button.inactive {
        width: 28px;
        height: 28px;
        padding: 0;
    }
    
}

/* Version Display - Unobtrusive */
.version-display {
    position: fixed;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-xs);
    color: var(--color-text-quaternary);
    font-family: inherit;
    user-select: none;
    pointer-events: none;
    z-index: 1;
    opacity: 0.5;
    transition: opacity var(--transition-base);
    text-align: center;
}

.version-display:hover {
    opacity: 0.8;
}

/* Help Section - Collapsible Guide */
.help-toggle-button {
    /* Inherits from .mode-button, matches musicToggleButton styling */
    font-weight: bold;
    /* Default to inactive (greyed out) */
    background-color: var(--color-gray-100);
    color: #2a2a2a; /* WCAG AA compliant: 7.5:1 contrast ratio on light background (#e0e0e0) */
    border: 2px solid transparent;
    box-sizing: border-box;
}

.help-toggle-button.active {
    /* Active state when content is shown (blue) */
    background-color: var(--color-primary);
    color: white;
    font-weight: bold;
    border: 2px solid transparent;
    box-sizing: border-box;
}

.help-content {
    width: 100%;
    margin: var(--spacing-sm) auto;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-sizing: border-box;
    transition: opacity var(--transition-fast);
    border: 1px solid var(--color-gray-400);
    border-radius: var(--radius-lg);
    opacity: 0.7;
}

.help-content.hidden {
    display: none;
}

.help-text {
    text-align: left;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-text-secondary);
}

.help-text p {
    margin: var(--spacing-md) 0;
}

.help-text p:first-child {
    margin-top: 0;
}

.help-text p:last-child {
    margin-bottom: 0;
}

.help-text strong {
    color: var(--color-text-primary);
    font-weight: 500;
}

.help-list {
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-2xl);
    padding: 0;
    list-style-type: disc;
    color: var(--color-text-secondary);
}

.help-list li {
    margin: var(--spacing-sm) 0;
    line-height: 1.5;
}

/* Color wave pulse animation for cascading effect */
@keyframes color-wave-pulse {
    0% {
        transform: scale(1);
        filter: brightness(1);
    }
    50% {
        transform: scale(1.15);
        filter: brightness(1.3);
    }
    100% {
        transform: scale(1);
        filter: brightness(1);
    }
}

.color-wave-pulse {
    animation: color-wave-pulse 0.8s ease-in-out;
}

/* Ripple circles animation for color wave background effect */
@keyframes ripple-expand {
    0% {
        transform: scale(0);
        opacity: 0.6;
    }
    20% {
        opacity: 0.5;
    }
    40% {
        opacity: 0.3;
    }
    60% {
        opacity: 0.15;
    }
    80% {
        opacity: 0.05;
    }
    100% {
        transform: scale(40);
        opacity: 0;
    }
}