:root { --bg: #fff; --fg: #000; --muted: #666; --panel: #f7f7f7; --border: #ddd; --accent: #1772d0; --hover: #f09228; }
body.dark-mode { --bg: #111; --fg: #bbb; --muted: #888; --panel: #1a1a1a; --border: #333; }
* { box-sizing: border-box; }
body { margin: 0; padding: 0 16px 48px; font: 14px/1.5 'Lato', Verdana, Helvetica, sans-serif; background: var(--bg); color: var(--fg); }
header, main, #about { max-width: 1400px; margin: 0 auto; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 0 16px; }
header h1 { margin: 0; }
#darkModeToggle { font-size: 20px; cursor: pointer; }
#darkModeToggle:hover { color: var(--hover); }
a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { color: var(--hover); }
.muted { color: var(--muted); }

.layout { display: grid; grid-template-columns: 310px minmax(0, 1fr); gap: 16px; }
#controls { display: grid; align-content: stretch; gap: 12px; padding: 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; }
.section { display: grid; align-content: center; gap: 8px; }
.section + .section { padding-top: 12px; border-top: 1px solid var(--border); }
.section h2 { margin: 0; font-size: .75em; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.field { display: grid; grid-template-columns: 3em minmax(0, 1fr); align-items: center; gap: 8px; }
.field.stacked { grid-template-columns: minmax(0, 1fr); gap: 4px; }
.field select, .field input, .section > button, .menu summary { width: 100%; }
.size-row { display: flex; align-items: center; gap: 4px; }
.size-row select { flex: 1; min-width: 0; padding: 4px 6px; }
@media (max-width: 760px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

button, select, input, .menu summary { font: inherit; padding: 4px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--fg); }
button, select, .menu summary { cursor: pointer; }
button:disabled, input:disabled { opacity: .5; cursor: default; }
.size-row input { width: 2.6em; padding: 4px 6px; text-align: center; }
.menu { position: relative; }
.menu summary { display: block; list-style: none; text-align: center; user-select: none; }
.menu summary::-webkit-details-marker { display: none; }
.menu summary::after { content: ' ▾'; }
.menu[open] summary::after { content: ' ▴'; }
.menu-items { position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 10; display: grid; gap: 2px; padding: 4px; background: var(--panel); border: 1px solid var(--border); border-radius: 6px; box-shadow: 0 4px 12px rgba(0, 0, 0, .25); }
.menu-items .field { grid-template-columns: minmax(0, 1fr); gap: 4px; padding: 4px 6px 6px; font-size: .9em; color: var(--muted); }
.menu-items button { border: 0; background: none; text-align: left; white-space: nowrap; }
.menu-items button:hover { background: var(--bg); }
#hint { margin: 0 0 8px; }
.scroll { overflow: auto; max-height: 75vh; border: 1px solid var(--border); border-radius: 6px; background: #000; }
.stage { position: relative; display: inline-block; line-height: 0; }
canvas { display: block; image-rendering: pixelated; }
#cv-overlay { position: absolute; left: 0; top: 0; width: 100%; height: 100%; cursor: crosshair; touch-action: manipulation; }
.info { display: flex; flex-wrap: wrap; gap: 16px; margin: 6px 0 0; }
#about { margin-top: 16px; padding: 12px 16px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; }
#about summary { cursor: pointer; font-weight: 600; }
#about[open] summary { margin-bottom: 8px; }
#about h3 { margin: 16px 0 4px; font-size: 1em; }
#about p, #about ol, #about ul { margin: 4px 0; }
#about li { margin: 2px 0; }