:root {
  --bg: #0a0a0c; --side: #0d0d10; --row: rgba(255,255,255,.04); --row-hi: rgba(255,255,255,.07);
  --bd: rgba(255,255,255,.07); --bd2: rgba(255,255,255,.11); --fg: #e6e7ea; --muted: #74777f;
  --faint: #4a4d55; --accent: #e8eaed;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
body { display: grid; grid-template-columns: 300px 1fr; height: 100vh; background: var(--bg); color: var(--fg); font-family: var(--font); overflow: hidden; }
svg { fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

#sidebar { background: var(--side); border-right: 1px solid var(--bd); display: flex; flex-direction: column; min-height: 0; }
#brand { display: flex; align-items: center; gap: 10px; padding: 14px; border-bottom: 1px solid var(--bd); }
#brand .logo { width: 20px; height: 20px; border-radius: 5px; }
#brand .wordmark { font-size: 13px; font-weight: 700; letter-spacing: .5px; }
#brand .spacer { flex: 1; }
.icon-btn { display: grid; place-items: center; width: 28px; height: 28px; color: var(--muted); background: transparent; border: 1px solid transparent; border-radius: 7px; cursor: pointer; text-decoration: none; }
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn:hover { color: var(--fg); background: var(--row); border-color: var(--bd); }

#scroll { flex: 1; min-height: 0; overflow-y: auto; padding: 12px 14px 16px; }
.sec { margin: 16px 0 7px; font-size: 10.5px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--faint); }
.sec:first-child { margin-top: 2px; }

.ctl { width: 100%; font: 13px var(--font); color: var(--fg); background: #16161a; border: 1px solid var(--bd2); border-radius: 8px; padding: 8px 10px; }
.ctl + .ctl, input.ctl { margin-top: 7px; }
select.ctl { appearance: none; cursor: pointer; }

.seg { display: flex; gap: 4px; margin-top: 7px; }
.seg button { flex: 1; font: 600 12px var(--font); color: var(--muted); background: #16161a; border: 1px solid var(--bd); border-radius: 7px; padding: 7px 4px; cursor: pointer; }
.seg button.on { color: #04140f; background: var(--accent); border-color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch { width: 34px; height: 34px; border-radius: 7px; border: 1px solid var(--bd2); cursor: pointer; padding: 0; background-color: #1a1a1e; }
.swatch:hover { transform: translateY(-1px); }
.swatch.active { box-shadow: 0 0 0 2px var(--side), 0 0 0 3px var(--fg); }

.row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 2px; font-size: 13px; color: var(--muted); cursor: pointer; }
.row input[type=checkbox] { accent-color: var(--accent); width: 16px; height: 16px; }
.row input[type=color] { width: 34px; height: 24px; padding: 0; border: 1px solid var(--bd2); border-radius: 6px; background: none; cursor: pointer; }

.btn { display: block; width: 100%; margin-top: 8px; font: 600 12.5px var(--font); color: var(--fg); background: var(--row-hi); border: 1px solid var(--bd2); border-radius: 8px; padding: 10px; cursor: pointer; text-align: center; }
.btn:hover { border-color: #4aa3ff66; color: #fff; }
.btn.primary { background: var(--accent); color: #04140f; border-color: var(--accent); }
.hint { font-size: 11px; color: var(--faint); margin: 8px 2px 0; }

.sig { display: flex; align-items: center; gap: 7px; padding: 11px 14px 15px; border-top: 1px solid var(--bd); font-size: 11.5px; color: var(--faint); text-decoration: none; }
.sig img { height: 18px; width: auto; opacity: .8; }
.sig:hover { color: var(--muted); }
.sig:hover img { opacity: 1; }

#stage { display: grid; place-items: center; padding: 32px; overflow: auto;
  background:
    radial-gradient(120% 90% at 50% 0%, #15151a 0%, #0a0a0c 60%),
    repeating-linear-gradient(0deg, transparent 0 38px, rgba(255,255,255,.012) 38px 39px),
    repeating-linear-gradient(90deg, transparent 0 38px, rgba(255,255,255,.012) 38px 39px); }
#art { max-width: 100%; max-height: calc(100vh - 64px); width: auto; height: auto;
  border-radius: 2px; box-shadow: 0 30px 80px rgba(0,0,0,.6), 0 6px 18px rgba(0,0,0,.4); }

#toast { position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px); background: #16161a; color: var(--fg); font: 600 12.5px var(--font); padding: 10px 18px; border: 1px solid var(--bd2); border-radius: 999px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 50; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 760px) {
  body { grid-template-columns: 1fr; grid-template-rows: 1fr auto; }
  #stage { order: -1; padding: 16px; }
  #art { max-height: 52vh; }
}