:root {
  --bg: #030409;
  --text: #eef2ff;
  --muted: #9aa3c0;
  --glass: rgba(12, 14, 26, 0.55);
  --border: rgba(255, 255, 255, 0.1);
  --accent: #33ffcc;
  --accent-2: #a855f7;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --serif: 'Instrument Serif', Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--bg); color: var(--text); font: 14px/1.5 var(--sans); }

#canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

button, select, input { font: inherit; color: inherit; }
kbd {
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  font: 500 11px var(--sans);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Brand ───────────────────────────────────────────────────────────────── */
.brand {
  position: fixed;
  left: clamp(16px, 4vw, 48px);
  bottom: clamp(16px, 5vh, 48px);
  max-width: 520px;
  pointer-events: none;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.6);
  transition: opacity 0.4s, transform 0.4s;
}
.brand h1 {
  margin: 0;
  font: 400 clamp(64px, 12vw, 148px)/0.9 var(--serif);
  letter-spacing: -0.03em;
}
.brand h1 span, .fallback h1 span { color: var(--accent); }
.brand p { margin: 12px 0 0; font-size: clamp(15px, 1.6vw, 19px); color: #d6dcf5; }
.brand em { font-family: var(--serif); font-size: 1.25em; color: var(--text); }
.brand-actions { display: flex; gap: 8px; margin-top: 18px; pointer-events: auto; }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.chip:hover, .chip:focus-visible { border-color: var(--accent); outline: none; background: rgba(51, 255, 204, 0.08); }

/* ── Panel ───────────────────────────────────────────────────────────────── */
.panel-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 3;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  cursor: pointer;
}
.panel-toggle svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.panel-toggle:hover, .panel-toggle:focus-visible { border-color: var(--accent); outline: none; }

.panel {
  position: fixed;
  top: 72px;
  right: 16px;
  z-index: 2;
  width: 300px;
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top right;
  transition: opacity 0.25s, transform 0.25s, visibility 0s linear 0.25s;
}
.panel-open .panel { opacity: 1; visibility: visible; transform: none; transition: opacity 0.25s, transform 0.25s; }
.panel form { display: grid; gap: 14px; }

fieldset { margin: 0; padding: 0; border: 0; }
legend, .field label, .select, .stats dt {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.presets { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.presets legend { margin-bottom: 8px; }
.presets button, .buttons button {
  padding: 7px 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}
.presets button:hover, .buttons button:hover,
.presets button:focus-visible, .buttons button:focus-visible { border-color: var(--accent); outline: none; background: rgba(51, 255, 204, 0.08); }
.buttons button[aria-pressed='true'] { border-color: var(--accent); background: rgba(51, 255, 204, 0.16); color: var(--accent); }

.field { display: grid; grid-template-columns: 1fr auto; align-items: center; row-gap: 6px; }
.field output { font: 500 12px var(--sans); font-variant-numeric: tabular-nums; color: var(--text); }
.field input { grid-column: 1 / -1; }

input[type='range'] {
  --fill: 50%;
  width: 100%;
  height: 4px;
  margin: 6px 0;
  border-radius: 99px;
  appearance: none;
  -webkit-appearance: none;
  background: linear-gradient(90deg, var(--accent), var(--accent-2)) 0 / var(--fill) 100% no-repeat, rgba(255, 255, 255, 0.12);
  cursor: pointer;
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(51, 255, 204, 0.25);
}
input[type='range']::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(51, 255, 204, 0.25);
}
input[type='range']:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.select { display: grid; gap: 6px; }
.select select {
  padding: 7px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  text-transform: none;
  letter-spacing: 0;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}
.select select option { background: #11131f; }

.switch { display: flex; align-items: center; gap: 8px; cursor: pointer; font-weight: 500; }
.switch input { position: absolute; opacity: 0; }
.switch span {
  position: relative;
  width: 32px;
  height: 18px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.15);
  transition: background 0.2s;
}
.switch span::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(14px); }
.switch input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin: 0; }
.stats div { padding: 8px; border-radius: 10px; background: rgba(255, 255, 255, 0.04); }
.stats dd { margin: 2px 0 0; font-weight: 600; font-variant-numeric: tabular-nums; font-size: 13px; }
.keys { margin: 0; color: var(--muted); font-size: 12px; line-height: 2; }

/* ── Toast & dialog ──────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  left: 50%;
  top: 20px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-weight: 500;
  opacity: 0;
  transform: translate(-50%, -10px);
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
  max-width: calc(100vw - 32px);
  overflow-wrap: anywhere;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.about {
  width: min(620px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(10, 12, 22, 0.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  color: var(--text);
  line-height: 1.6;
}
.about::backdrop { background: rgba(0, 0, 0, 0.4); }
.about h2 { margin: 0 0 8px; font: 400 40px/1.1 var(--serif); }
.about .close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  font-size: 20px;
  cursor: pointer;
}
.pipeline { counter-reset: step; list-style: none; margin: 16px 0; padding: 0; display: grid; gap: 8px; }
.pipeline li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 28px 170px 1fr;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
}
.pipeline li::before {
  content: counter(step);
  font-weight: 600;
  color: var(--accent);
}
.pipeline span { color: var(--muted); }
.muted { color: var(--muted); }

/* ── States ──────────────────────────────────────────────────────────────── */
.ui-hidden .brand, .ui-hidden .panel, .ui-hidden .panel-toggle { opacity: 0; pointer-events: none; visibility: hidden; }

.fallback { display: none; }
.no-webgl .fallback {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 24px;
  background: radial-gradient(circle at 30% 30%, #1d1240, var(--bg) 60%);
}
.no-webgl .fallback h1 { margin: 0; font: 400 96px/1 var(--serif); }
.no-webgl .brand, .no-webgl .panel, .no-webgl .panel-toggle { display: none; }

@media (max-width: 640px) {
  .panel { left: 12px; right: 12px; width: auto; top: 68px; max-height: 55vh; }
  .brand { right: 16px; }
  .pipeline li { grid-template-columns: 24px 1fr; }
  .pipeline span { grid-column: 2; }
}