:root {
  --purple: #753f97; --purple-2: #8e55b3; --green: #61ba46; --blue: #00a7e5;
  --ink: #1d2330; --muted: #6b7484; --line: #e3e7ee; --bg: #f4f6f9; --card: #ffffff;
  --radius: 14px; --ease: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: 'IBM Plex Sans Thai', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: var(--ink); background: var(--bg); color-scheme: light;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { display: flex; flex-direction: column; overflow: hidden; }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.top { height: 56px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; background: #fff; border-bottom: 1px solid var(--line); flex: none; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.logo { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-weight: 700; color: #fff;
  background: conic-gradient(from 200deg, var(--green), var(--blue), var(--purple), var(--green)); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text b { letter-spacing: .04em; }
.brand-text small { color: var(--muted); font-size: 11px; }
.top-links { display: flex; gap: 10px; align-items: center; font-size: 14px; }
.top-links a { color: var(--muted); text-decoration: none; }
.top-links a:hover { color: var(--purple); }
.top-links .btn-line { background: #06c755; color: #fff; padding: 7px 14px; border-radius: 999px; font-weight: 600; }
.top-links .btn-line:hover { color: #fff; filter: brightness(1.05); }

.app { flex: 1; display: grid; grid-template-columns: 360px 1fr; min-height: 0; }
.side { overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 12px; border-right: 1px solid var(--line); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.card h3 { margin: 0; font-size: 14px; font-weight: 600; color: var(--purple); }
.lbl { font-size: 13px; color: var(--muted); }
.muted { color: var(--muted); font-size: 13px; margin: 0; }
.tiny { font-size: 11.5px; }
textarea, select, input[type=number] { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: #fbfcfd; outline: none; transition: border-color .2s; }
textarea:focus, select:focus, input[type=number]:focus { border-color: var(--purple); background: #fff; }
textarea { resize: vertical; font-size: 18px; font-weight: 600; }
.row { display: flex; gap: 8px; align-items: center; }
.row.two > * { flex: 1; }
.row select { flex: 1; }

.btn { border: 1px solid var(--line); background: #fff; border-radius: 10px; padding: 9px 12px; cursor: pointer; font-weight: 600; font-size: 14px;
  transition: transform .15s var(--ease), background .2s, border-color .2s; text-align: center; white-space: nowrap; }
.btn:hover { border-color: var(--purple); color: var(--purple); }
.btn:active { transform: scale(.97); }
.btn.small { padding: 6px 10px; font-size: 12.5px; }
.btn.ghost { background: transparent; }
.btn.primary { background: linear-gradient(135deg, var(--purple), var(--purple-2)); color: #fff; border: 0; padding: 12px; font-size: 15px; box-shadow: 0 6px 18px rgba(117,63,151,.3); }
.btn.primary:hover { color: #fff; filter: brightness(1.06); }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }

.seg { display: flex; background: #eef1f5; border-radius: 10px; padding: 3px; gap: 2px; }
.seg button { flex: 1; border: 0; background: transparent; border-radius: 8px; padding: 7px 6px; cursor: pointer; font-weight: 600; font-size: 13.5px; color: var(--muted); transition: background .2s, color .2s; }
.seg button.on { background: #fff; color: var(--purple); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.seg.small button { font-size: 12.5px; padding: 5px; }
.seg.dark { background: rgba(20,24,32,.72); backdrop-filter: blur(8px); }
.seg.dark button { color: #cfd6e0; }
.seg.dark button.on { background: var(--purple); color: #fff; }

.slider, .param { display: grid; grid-template-columns: 1fr 1.1fr auto; align-items: center; gap: 8px; font-size: 13px; }
.slider output { min-width: 56px; text-align: right; color: var(--purple); font-variant-numeric: tabular-nums; }
.param { grid-template-columns: 1fr 1fr 64px 22px; }
.param span { color: #3c4453; }
.param input[type=number] { padding: 4px 6px; text-align: right; }
.param em { font-style: normal; color: var(--muted); font-size: 11px; }
input[type=range] { width: 100%; accent-color: var(--purple); }

.num { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.dot.w { background: #ef4444; } .dot.h { background: var(--green); } .dot.d { background: var(--blue); }

.struct-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.struct { border: 1.5px solid var(--line); background: #fff; border-radius: 10px; padding: 4px; cursor: pointer; position: relative; transition: border-color .2s, transform .15s var(--ease); }
.struct svg { width: 100%; display: block; }
.struct span { position: absolute; left: 50%; bottom: calc(100% + 6px); transform: translateX(-50%); background: var(--ink); color: #fff; font-size: 11.5px;
  padding: 3px 8px; border-radius: 6px; white-space: nowrap; pointer-events: none; opacity: 0; transition: opacity .15s; z-index: 5; }
.struct:hover span { opacity: 1; }
.struct:hover { transform: translateY(-1px); border-color: #c9b3d8; }
.struct.on { border-color: var(--purple); box-shadow: 0 0 0 3px rgba(117,63,151,.15); }
.struct-hint { margin: 0; font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.struct-hint b { color: var(--ink); }

.colors { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.colors label { display: flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11.5px; color: var(--muted); }
.colors input { width: 100%; height: 30px; border: 1px solid var(--line); border-radius: 8px; padding: 2px; background: #fff; cursor: pointer; }

.drop { border: 2px dashed #cdbbdb; border-radius: 12px; padding: 18px; display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; text-align: center; color: var(--purple); }
.drop small { color: var(--muted); }
.drop:hover { background: #faf6fd; }

.summary .srow { display: flex; justify-content: space-between; gap: 8px; font-size: 12.5px; padding: 4px 0; border-bottom: 1px dashed var(--line); }
.summary .srow:last-child { border-bottom: 0; }
.summary b { font-weight: 600; text-align: right; }
.foot { font-size: 11px; color: var(--muted); text-align: center; padding: 4px 0 10px; }

.stage { position: relative; min-width: 0; min-height: 0; }
.viewport { position: absolute; inset: 0; }
.viewport canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.hud { position: absolute; display: flex; gap: 8px; align-items: center; }
.hud.top-left { top: 12px; left: 12px; }
.hud.top-right { top: 12px; right: 12px; }
.hud.bottom { bottom: 14px; left: 50%; transform: translateX(-50%); flex-wrap: wrap; justify-content: center; width: max-content; max-width: calc(100% - 24px); }
.badge, .status { background: rgba(255,255,255,.9); backdrop-filter: blur(8px); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 13px; font-variant-numeric: tabular-nums; }
.badge small { color: var(--muted); }
.status.busy { color: var(--purple); }
.status.busy::before { content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--purple); margin-right: 6px; animation: pulse 1s infinite; }
.status.ok { color: #2f8a1d; } .status.err { color: #c0362c; }
@keyframes pulse { 50% { opacity: .25; } }
.btn.pill { border-radius: 999px; background: rgba(20,24,32,.72); color: #fff; border: 0; backdrop-filter: blur(8px); }
.btn.pill:hover { color: #fff; background: rgba(20,24,32,.85); }
.btn.pill.on { background: #f5b301; color: #1d2330; }
.explode { display: flex; align-items: center; gap: 8px; background: rgba(20,24,32,.72); color: #fff; padding: 7px 12px; border-radius: 999px; font-size: 13px; backdrop-filter: blur(8px); }
.explode input { width: 110px; }
.warnings { position: absolute; top: 56px; left: 12px; max-width: min(520px, calc(100% - 24px)); background: #fff8e6; border: 1px solid #f5d68a; color: #7a5300; border-radius: 12px; padding: 8px 12px; font-size: 12.5px; line-height: 1.5; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 12px; font-size: 14px; opacity: 0; transition: all .3s var(--ease); z-index: 99; max-width: 90vw; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: #b42318; }

@media (max-width: 900px) {
  body { overflow: auto; }
  .app { grid-template-columns: 1fr; grid-template-rows: 58vh auto; }
  .stage { order: -1; }
  .side { border-right: 0; overflow: visible; }
  .top-links a:not(.btn-line) { display: none; }
  .struct-grid { grid-template-columns: repeat(5, 1fr); }
  .explode input { width: 80px; }
}