/**
 * Negative Colors - Stylesheet
 * ============================
 *
 * Structure:
 * 1. CSS Custom Properties (variables)
 * 2. Base/Reset styles
 * 3. Color Display (main canvas)
 * 4. Info Panel (top-right overlay)
 * 5. Control Bar (bottom, auto-hide)
 * 6. Responsive adjustments
 * 7. Utility classes
 */

/* ==========================================================================
   1. CSS Custom Properties
   ========================================================================== */

:root {
    /* Colors */
    --bg-overlay: rgba(0, 0, 0, 0.7);
    --bg-overlay-light: rgba(255, 255, 255, 0.9);
    --text-light: #ffffff;
    --text-dark: #000000;
    --accent: #4a90d9;
    --accent-hover: #6ba3e0;

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

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Control bar */
    --control-bar-height: 60px;
    --control-bar-bg: rgba(0, 0, 0, 0.85);

    /* Info panel */
    --info-panel-width: 280px;
    --info-panel-bg: rgba(0, 0, 0, 0.85);

    /* Dynamic text color (set via JS based on background luminance) */
    --dynamic-text-color: var(--text-light);
}

/* ==========================================================================
   2. Base/Reset Styles
   ========================================================================== */

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   3. Color Display (Main Canvas)
   ========================================================================== */

.color-display {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #000000;
    transition: background-color var(--transition-slow);
    cursor: crosshair;
}

/* ==========================================================================
   4. Info Panel (Top-Right Overlay)
   ========================================================================== */

.info-panel {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: var(--info-panel-width);
    padding: var(--spacing-lg);
    background: var(--info-panel-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    color: var(--text-light);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    z-index: 100;
}

.info-panel.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateX(20px);
}

.info-panel h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.info-label {
    color: rgba(255, 255, 255, 0.7);
}

.info-value {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-weight: 500;
}

.info-hint {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
}

/* ==========================================================================
   5. Control Bar (Bottom, Auto-Hide)
   ========================================================================== */

.control-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: var(--control-bar-height);
    background: var(--control-bar-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-lg);
    z-index: 200;

    /* Auto-hide behavior */
    opacity: 0;
    transform: translateY(100%);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

/* Show control bar on hover (bottom edge detection) */
.control-bar:hover,
.control-bar.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hover trigger zone at bottom of screen */
body::after {
    content: '';
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40px;
    z-index: 199;
}

body:hover .control-bar,
.control-bar:focus-within {
    opacity: 1;
    transform: translateY(0);
}

/* More specific: only show when hovering bottom area */
body::after:hover ~ .control-bar {
    opacity: 1;
    transform: translateY(0);
}

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

.control-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-label {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

/* Control buttons */
.control-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--text-light);
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.control-btn:active {
    background: rgba(255, 255, 255, 0.3);
}

.control-btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--accent);
}

.control-btn .icon {
    font-size: 0.875rem;
    line-height: 1;
}

.control-btn.play-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
}

.control-btn.play-btn .icon {
    font-size: 1rem;
}

/* Playing state */
.control-btn.play-btn.playing {
    background: var(--accent);
    border-color: var(--accent);
}

/* Select dropdowns */
.control-select {
    appearance: none;
    -webkit-appearance: none;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--text-light);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);

    /* Custom dropdown arrow */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.control-select:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.control-select:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--accent);
}

.control-select option {
    background: #1a1a1a;
    color: var(--text-light);
}

/* Playback controls grouping */
.playback-controls {
    gap: var(--spacing-xs);
}

/* ==========================================================================
   6. Responsive Adjustments
   ========================================================================== */

@media (max-width: 768px) {
    :root {
        --control-bar-height: auto;
        --info-panel-width: calc(100vw - 2rem);
    }

    .control-bar {
        padding: var(--spacing-md);
    }

    .control-group {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-md);
    }

    .control-section {
        flex: 0 0 auto;
    }

    .control-label {
        display: none;
    }

    .info-panel {
        top: auto;
        bottom: calc(var(--control-bar-height) + var(--spacing-lg));
        right: var(--spacing-md);
        left: var(--spacing-md);
        width: auto;
    }
}

@media (max-width: 480px) {
    .control-group {
        gap: var(--spacing-sm);
    }

    .control-select {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        padding-right: var(--spacing-lg);
    }
}

/* ==========================================================================
   7. Utility Classes
   ========================================================================== */

.hidden {
    display: none !important;
}

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

/* Text color classes for contrast */
.text-light {
    color: var(--text-light);
}

.text-dark {
    color: var(--text-dark);
}

/* Fade transition for color changes */
@keyframes colorPulse {
    0% { opacity: 0.9; }
    50% { opacity: 1; }
    100% { opacity: 0.9; }
}

.color-display.transitioning {
    animation: colorPulse 0.3s ease;
}