@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
    --bg: #10142a;
    --panel: #1a2040;
    --panel-border: #2e3768;
    --text: #e7e6dc;
    --text-dim: #8890b5;

    /* colours match the bar colors in renderer.js - control panel should read */
    --amber: #e8a33d;
    --teal: #3ec9b0;
    --red: #e8483d;
    --purple: #c34fe0;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: 'JetBrains Mono', Consolas, Menlo, monospace;
}

#app {
    display: flex;
    min-height: 100vh;
}

/* ---------- sidebar ---------- */

#controls {
    width: 260px;
    flex-shrink: 0;
    background: var(--panel);
    border-right: 1px solid var(--panel-border);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.panel-header h1 {
    margin: 0;
    font-size: 1.15rem;
    letter-spacing: 0.12em;
    color: var(--teal);
}

.panel-header .tagline {
    margin: 4px 0 0;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
}

.control-group label span {
    color: var(--amber);
}

/* ---------- select ---------- */

select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 8px 10px;
    font: inherit;
    font-size: 0.85rem;
}

select:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 1px;
}

/* ---------- range sliders ---------- */

input[type='range'] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--panel-border);
    border-radius: 2px;
}

input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--amber);
    cursor: pointer;
    border: 2px solid var(--bg);
}

input[type='range']::-moz-range-thumb {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--amber);
    cursor: pointer;
    border: 2px solid var(--bg);
}

input[type='range']:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 3px;
}

/* ---------- buttons ---------- */

.button-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 6px;
}

button {
    font: inherit;
    font-size: 0.85rem;
    padding: 10px 14px;
    border-radius: 4px;
    border: 1px solid var(--panel-border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease;
}

button:hover {
    border-color: var(--teal);
    color: var(--teal);
}

button:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 2px;
}

button.primary {
    background: var(--teal);
    border-color: var(--teal);
    color: var(--bg);
    font-weight: 700;
}

button.primary:hover {
    background: transparent;
    color: var(--teal);
}

/* ---------- canvas ---------- */

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

canvas {
    width: 100%;
    max-width: 1100px;
    height: auto;
    background-color: var(--bg);
    background-image: repeating-linear-gradient(
        to top,
        var(--panel-border) 0,
        var(--panel-border) 1px,
        transparent 1px,
        transparent 50px
    );
    border: 1px solid var(--panel-border);
    border-radius: 6px;
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* ---------- range + number pairing ---------- */

.range-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.range-row input[type='range'] {
    flex: 1;
}

.range-row input[type='number'] {
    width: 60px;
    flex-shrink: 0;
    font: inherit;
    font-size: 0.85rem;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 4px 6px;
    text-align: right;
}

.range-row input[type='number']:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 1px;
}

/* removes the default up/down spinner arrows so it matches the flat theme */
.range-row input[type='number']::-webkit-inner-spin-button,
.range-row input[type='number']::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
/* .range-row input[type='number'] {
    -moz-appearance: textfield;
} */

/* ---------------- stats bar ------------------- */
main {
    flex-direction: column;
    gap: 12px;
}

#stats-bar {
    display: flex;
    gap: 32px;
    width: 100%;
    max-width: 1100px;
    padding: 0 4px;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

.stat-value {
    font-size: 1rem;
    font-weight: 700;
}

.stat-value-timer {
    color: var(--amber);
}

.stat-value-complexity {
    color: var(--teal);
}

.stat-value-comparisons {
  color: var(--purple);
}

.stat-value-swaps {
  color: var(--red);
}

canvas.no-grid {
    background-image: none;
}

/* ---------- Canvas wrapper + code panel ---------- */

#canvas-wrapper {
    position: relative;
    width: 100%;
    max-width: 1100px;
}

#canvas-wrapper canvas {
    max-width: none; /* sizing now comes from the wrapper instead */
}

#code-panel {
    position: absolute;
    inset: 0;
    margin: 0;
    overflow: auto;
    background: var(--bg);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 18px 22px;
    font-family: 'JetBrains Mono', Consolas, Menlo, monospace;
    font-size: 0.8rem;
    line-height: 1.6;
    white-space: pre;
}

#code-panel.hidden {
    display: none;
}

.tok-comment {
    color: var(--text-dim);
}

.tok-string {
    color: var(--amber);
}

.tok-keyword {
    color: var(--purple);
    font-weight: 700;
}

.description-row {
    position: relative;
}

.algorithm-description {
    margin: 0;
    padding-right: 20px;
    font-size: 0.72rem;
    line-height: 1.5;
    max-height: 3em;
    overflow: hidden;
    position: relative;
    color: var(--text-dim);
}

.algorithm-description::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 20px;
    height: 1.4em;
    background: linear-gradient(to bottom, transparent, var(--panel));
}

.info-btn {
    position: absolute;
    top: 0;
    right: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid var(--panel-border);
    background: var(--bg);
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-style: italic;
    line-height: 1;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.info-btn:hover,
.info-btn:focus-visible {
    color: var(--teal);
    border-color: var(--teal);
    outline: none;
}

.description-popup {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    width: 100%;
    z-index: 20;
    background: var(--bg);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.72rem;
    line-height: 1.5;
    color: var(--text);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-4px);
    transition: opacity 0.12s ease, transform 0.12s ease;
}

.description-row:hover .description-popup,
.description-popup.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.shortcuts-hint {
    margin: 0;
    font-size: 0.68rem;
    color: var(--text-dim);
    text-align: center;
}