/* abcdon - style.css */

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

:root {
    /* colors from v-alpha1 */
    --bg-color: #f7fafc;
    --grid-bg: #edf2f7;
    --grid-border: #e2e8f0;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --cursor-color: rgba(66, 153, 225, 0.4);

    /* instrument colors */
    --kick-color: #4a5568;
    --kick-active: #2d3748;
    --snare-color: #ed8936;
    --snare-active: #dd6b20;
    --hihat-color: #48bb78;
    --hihat-active: #38a169;
    --perc-color: #9f7aea;
    --perc-active: #805ad5;
}

body {
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem;
    text-transform: lowercase;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--grid-border);
    margin-bottom: 0.5rem;
}

h1 .letter {
    display: inline-block;
    transition: color 0.08s ease-out, transform 0.08s ease-out;
}

h1 .letter-static {
    color: var(--grid-border);
}

h1 .letter[data-instrument="kick"] {
    color: var(--grid-border);
}
h1 .letter[data-instrument="snare"] {
    color: var(--grid-border);
}
h1 .letter[data-instrument="hihat"] {
    color: var(--grid-border);
}
h1 .letter[data-instrument="perc"] {
    color: var(--grid-border);
}

h1 .letter.active[data-instrument="kick"] {
    color: var(--kick-color);
    transform: scale(1.15);
}
h1 .letter.active[data-instrument="snare"] {
    color: var(--snare-color);
    transform: scale(1.15);
}
h1 .letter.active[data-instrument="hihat"] {
    color: var(--hihat-color);
    transform: scale(1.15);
}
h1 .letter.active[data-instrument="perc"] {
    color: var(--perc-color);
    transform: scale(1.15);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* controls */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.control-group.primary select {
    min-width: 220px;
    font-size: 1.4rem;
    font-weight: 700;
    padding: 0.8rem 1.2rem;
}

select {
    padding: 0.6rem 1rem;
    font-size: 1rem;
    font-family: 'Space Grotesk', inherit;
    font-weight: 500;
    border: 2px solid var(--grid-border);
    border-radius: 8px;
    background: white;
    color: var(--text-primary);
    cursor: pointer;
    text-transform: lowercase;
}

select:focus {
    outline: none;
    border-color: #4299e1;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

/* transport */
.transport {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.play-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--text-primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.1s, background 0.2s;
}

.play-btn:hover {
    background: #1a202c;
    transform: scale(1.05);
}

.play-btn:active {
    transform: scale(0.95);
}

.play-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.play-btn.playing {
    background: #e53e3e;
}

.bpm-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.bpm-slider {
    width: 120px;
    height: 6px;
    -webkit-appearance: none;
    background: var(--grid-border);
    border-radius: 3px;
    cursor: pointer;
}

.bpm-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
}

.bpm-value {
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 60px;
}

/* grid */
.grid-container {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.grid-wrapper {
    position: relative;
    overflow: hidden;
}

.grid {
    display: grid;
    grid-template-columns: 80px repeat(16, 1fr);
    gap: 3px;
}

.row {
    display: contents;
}

.instrument-label {
    display: flex;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding-right: 0.5rem;
}

.cell {
    aspect-ratio: 1;
    border-radius: 4px;
    background: var(--grid-bg);
    border: 1px solid var(--grid-border);
    cursor: pointer;
    transition: background 0.1s, transform 0.1s;
}

.cell:hover {
    background: #e2e8f0;
}

.cell.downbeat {
    border-bottom: 2px solid var(--grid-border);
}

.cell.active {
    transform: scale(0.95);
}

.row.kick .cell.active {
    background: var(--kick-color);
    border-color: var(--kick-active);
}

.row.snare .cell.active {
    background: var(--snare-color);
    border-color: var(--snare-active);
}

.row.hihat .cell.active {
    background: var(--hihat-color);
    border-color: var(--hihat-active);
}

.row.perc .cell.active {
    background: var(--perc-color);
    border-color: var(--perc-active);
}

/* cursor */
.cursor {
    position: absolute;
    top: 0;
    bottom: 0;
    width: calc((100% - 80px - 45px) / 16);
    background: var(--cursor-color);
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    left: 80px;
}

.cursor.visible {
    opacity: 1;
}

/* beat numbers */
.beat-numbers {
    display: grid;
    grid-template-columns: 80px repeat(16, 1fr);
    gap: 3px;
    margin-top: 0.5rem;
}

.beat-number {
    text-align: center;
    font-size: 0.65rem;
    color: rgba(113, 128, 150, 0.25);
    font-weight: 500;
}

.beat-number.downbeat {
    color: rgba(113, 128, 150, 0.35);
}

/* visualizer */
.visualizer-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    background: var(--grid-bg);
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

#visualizer {
    display: block;
    border-radius: 50%;
}

/* responsive */
@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    select {
        width: 100%;
    }

    .transport {
        justify-content: center;
    }

    .grid-container {
        overflow-x: auto;
        padding: 1rem;
    }

    .grid {
        min-width: 500px;
    }
}