:root {
    --bg-0: #080808;
    --bg-1: #0f0f0f;
    --bg-2: #171717;
    --bg-3: #1f1f1f;
    --border: #2a2a2a;
    --border-hi: #3a3a3a;
    --text: #c8c8c8;
    --text-dim: #666;
    --text-faint: #444;
    --green: #00e676;
    --green-soft: rgba(0, 230, 118, 0.12);
    --green-glow: rgba(0, 230, 118, 0.25);
    --amber: #ffab00;
    --amber-soft: rgba(255, 171, 0, 0.1);
    --red: #ff5252;
    --red-soft: rgba(255, 82, 82, 0.1);
    --mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
    --radius: 6px;
    --fast: 150ms ease;
}

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

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

body {
    background: var(--bg-0);
    color: var(--text);
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
}

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

#topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 20px;
}

.topbar-left {
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-shrink: 0;
}

#logo {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--green);
}

#logo .dim {
    color: var(--text-faint);
    font-weight: 400;
}

#version {
    font-size: 10px;
    color: var(--text-faint);
    background: var(--bg-3);
    padding: 2px 6px;
    border-radius: 3px;
}

#readouts {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.readout {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.readout-key {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-faint);
}

.readout-val {
    font-size: 15px;
    font-weight: 600;
    color: var(--green);
    min-width: 40px;
    text-align: right;
}

#workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

#tools {
    width: 270px;
    flex-shrink: 0;
    background: var(--bg-1);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#tools::-webkit-scrollbar {
    width: 5px;
}

#tools::-webkit-scrollbar-track {
    background: transparent;
}

#tools::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

#transport {
    display: flex;
    gap: 5px;
}

.tbtn {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 6px 11px;
    cursor: pointer;
    transition: all var(--fast);
    background: var(--bg-2);
    color: var(--text-dim);
    outline: none;
    text-transform: lowercase;
}

.tbtn:hover {
    background: var(--bg-3);
    color: var(--text);
    border-color: var(--border-hi);
}

.tbtn:active {
    transform: scale(0.96);
}

.tbtn-go {
    background: var(--green-soft);
    color: var(--green);
    border-color: rgba(0, 230, 118, 0.3);
}

.tbtn-go:hover {
    background: rgba(0, 230, 118, 0.2);
}

.tbtn-go.running {
    background: var(--amber-soft);
    color: var(--amber);
    border-color: rgba(255, 171, 0, 0.3);
}

.tbtn-red {
    color: var(--red);
    border-color: rgba(255, 82, 82, 0.25);
    background: var(--red-soft);
}

.tbtn-red:hover {
    background: rgba(255, 82, 82, 0.2);
}

.tbtn-full {
    width: 100%;
    text-align: center;
}

.tool-row {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 28px;
}

.tool-row label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-faint);
    min-width: 48px;
    flex-shrink: 0;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--green);
    cursor: pointer;
    border: 2px solid var(--bg-1);
}

#speed-readout {
    font-size: 10px;
    color: var(--text-faint);
    min-width: 30px;
    text-align: right;
}

select {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-0);
    color: var(--text);
    font-family: var(--mono);
    font-size: 11px;
    outline: none;
    cursor: pointer;
}

select:focus {
    border-color: var(--green);
}

.tinput {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-0);
    color: var(--text);
    font-family: var(--mono);
    font-size: 11px;
    outline: none;
}

.tinput:focus {
    border-color: var(--green);
}

.toggle-group {
    display: flex;
    gap: 0;
    flex: 1;
}

.toggle {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    padding: 4px 10px;
    border: 1px solid var(--border);
    background: var(--bg-0);
    color: var(--text-faint);
    cursor: pointer;
    transition: all var(--fast);
    outline: none;
}

.toggle:first-child {
    border-radius: 4px 0 0 4px;
}

.toggle:last-child {
    border-radius: 0 4px 4px 0;
}

.toggle:not(:first-child) {
    border-left: none;
}

.toggle.active {
    background: var(--green-soft);
    color: var(--green);
    border-color: rgba(0, 230, 118, 0.3);
}

.toggle:hover:not(.active) {
    color: var(--text-dim);
}

.tool-section {
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

.section-head {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--green);
    margin-bottom: 8px;
    opacity: 0.7;
}

#pattern-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.pat-btn {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    padding: 6px 4px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-0);
    color: var(--text-faint);
    cursor: pointer;
    transition: all var(--fast);
    text-align: center;
    outline: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pat-btn:hover {
    border-color: var(--green);
    color: var(--green);
}

.pat-btn.picked {
    background: var(--green-soft);
    color: var(--green);
    border-color: rgba(0, 230, 118, 0.3);
}

#theme-swatches {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    flex: 1;
}

.swatch {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all var(--fast);
}

.swatch:hover {
    transform: scale(1.2);
}

.swatch.on {
    border-color: var(--text);
}

.about {
    font-size: 11px;
    color: var(--text-dim);
    line-height: 1.55;
    margin-bottom: 6px;
}

.note {
    font-size: 10px;
    color: var(--amber);
    background: var(--amber-soft);
    border: 1px solid rgba(255, 171, 0, 0.15);
    border-radius: 4px;
    padding: 7px 9px;
    line-height: 1.5;
    margin-top: 6px;
}

#viewport {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-0);
}

#canvas-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 16px;
}

#grid-canvas {
    cursor: crosshair;
    image-rendering: pixelated;
    display: block;
    box-shadow: 0 0 0 1px var(--border);
}

#spark-canvas {
    width: 100%;
    height: 48px;
    display: block;
    border-top: 1px solid var(--border);
    background: var(--bg-1);
    flex-shrink: 0;
}

#bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-top: 1px solid var(--border);
    background: var(--bg-1);
    flex-shrink: 0;
}

#draw-indicator {
    font-size: 10px;
    color: var(--text-faint);
    margin-left: auto;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#toast-box {
    position: fixed;
    bottom: 16px;
    right: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    z-index: 100;
    pointer-events: none;
}

.toast {
    font-family: var(--mono);
    font-size: 11px;
    padding: 8px 14px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    animation: toastUp 250ms ease forwards;
    pointer-events: auto;
}

.toast.out {
    animation: toastDown 250ms ease forwards;
}

@keyframes toastUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastDown {
    from { opacity: 1; }
    to { opacity: 0; }
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal.hidden {
    display: none;
}

.modal-inner {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    width: 400px;
    max-width: 90vw;
}

.modal-inner h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--green);
    margin-bottom: 10px;
}

.modal-inner textarea {
    width: 100%;
    height: 140px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-0);
    color: var(--text);
    font-family: var(--mono);
    font-size: 11px;
    padding: 8px;
    resize: vertical;
    outline: none;
    margin-bottom: 10px;
}

.modal-inner textarea:focus {
    border-color: var(--green);
}

.modal-btns {
    display: flex;
    gap: 6px;
    justify-content: flex-end;
}

@media (max-width: 860px) {
    #workspace {
        flex-direction: column;
    }
    #tools {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        max-height: 220px;
        flex-direction: row;
        flex-wrap: wrap;
        overflow-x: auto;
    }
    .tool-section {
        min-width: 200px;
    }
}