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

:root {
    --bg: #1a1a2e;
    --surface: #16213e;
    --surface2: #0f3460;
    --accent: #e94560;
    --text: #eaeaea;
    --text-dim: #8892a4;
    --border: #2a2a4a;
    --monitor-on: #3a7bd5;
    --monitor-off: #1a1a2e;
    --monitor-border: #4a4a6a;
    --radius: 6px;
}

body {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 24px;
}

h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-dim);
    font-size: 0.8rem;
    margin-bottom: 24px;
}

.layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 800px) {
    .layout { grid-template-columns: 1fr; }
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.panel-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-dim);
    margin-bottom: 12px;
}

/* ── Monitor Grid ────────────────────────────── */

.grid-container {
    display: inline-grid;
    grid-template-columns: repeat(8, 32px);
    grid-template-rows: repeat(6, 32px);
    gap: 3px;
    margin-bottom: 12px;
}

.grid-cell {
    width: 32px;
    height: 32px;
    background: var(--monitor-off);
    border: 2px solid var(--monitor-border);
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.1s, border-color 0.1s;
}

.grid-cell:hover {
    border-color: var(--accent);
}

.grid-cell.active {
    background: var(--monitor-on);
    border-color: #5a9bf5;
}

.grid-info {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 8px;
    line-height: 1.6;
}

.grid-info strong {
    color: var(--text);
}

.scale-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: 0.8rem;
}

.scale-row select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 4px 8px;
    font-family: inherit;
    font-size: 0.8rem;
}

/* ── Upload ──────────────────────────────────── */

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    margin-bottom: 12px;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(233, 69, 96, 0.05);
}

.drop-zone p {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.drop-zone input[type="file"] { display: none; }

.url-row {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.url-row input {
    flex: 1;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 10px;
    font-family: inherit;
    font-size: 0.8rem;
}

.btn {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: 6px 14px;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
    white-space: nowrap;
}

.btn:hover { opacity: 0.85; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-secondary {
    background: var(--surface2);
}

.convert-btn {
    width: 100%;
    padding: 10px;
    font-size: 0.9rem;
    margin-top: 8px;
}

/* ── Cache gallery ───────────────────────────── */

.cache-gallery {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.cache-thumb {
    width: 48px;
    height: 48px;
    border-radius: 4px;
    object-fit: cover;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.15s;
}

.cache-thumb:hover {
    border-color: var(--accent);
}

.cache-thumb.selected {
    border-color: var(--monitor-on);
}

/* ── Preview ─────────────────────────────────── */

.preview-area {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.preview-canvas-wrap {
    background: #191919;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 8px;
    display: inline-block;
    image-rendering: pixelated;
}

#previewCanvas {
    image-rendering: pixelated;
    display: block;
}

.frame-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    font-size: 0.8rem;
}

.frame-controls input[type="range"] {
    width: 200px;
    accent-color: var(--accent);
}

/* ── Share / Asset code ──────────────────────── */

.share-panel {
    margin-top: 16px;
    text-align: center;
}

.asset-code {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    padding: 8px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: inline-block;
    cursor: pointer;
    user-select: all;
    margin: 8px 0;
}

.asset-code:hover {
    border-color: var(--accent);
}

.share-urls {
    font-size: 0.7rem;
    color: var(--text-dim);
    word-break: break-all;
    line-height: 1.8;
    margin-top: 6px;
}

.share-urls code {
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 3px;
}

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface2);
    color: var(--text);
    padding: 8px 20px;
    border-radius: var(--radius);
    font-size: 0.8rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast.visible { opacity: 1; }

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--text-dim);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
    color: var(--text-dim);
    font-size: 0.8rem;
    text-align: center;
    padding: 40px 20px;
}