:root {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1e222c;
  --border: #2a2f3a;
  --text: #e7e9ee;
  --muted: #8b93a7;
  --accent: #7aa2ff;
  --danger: #ff7a7a;
  --radius: 8px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.4;
}

.app-header {
  padding: 18px 24px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.app-header h1 { margin: 0 0 4px; font-size: 18px; font-weight: 600; }
.app-header .sub { margin: 0; color: var(--muted); font-size: 13px; }
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.repo-link:hover { color: var(--text); background: var(--surface-2); }

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  padding: 20px 24px;
  align-items: start;
}
.controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: sticky; top: 16px;
}

@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } .controls { position: static; } }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 12px; color: var(--muted); display: flex; justify-content: space-between; }
.field .val { color: var(--text); font-variant-numeric: tabular-nums; }
.field.checkbox { flex-direction: row; align-items: center; gap: 8px; }
.field.checkbox label { color: var(--text); font-size: 13px; }

input[type="text"], select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 9px;
  font: inherit;
  font-variant-numeric: tabular-nums;
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="color"] {
  width: 44px; height: 32px; padding: 0;
  background: none; border: 1px solid var(--border); border-radius: 6px;
  cursor: pointer;
}

.seed-row { display: flex; gap: 8px; align-items: center; }
.seed-row input[type="text"] { flex: 1; font-family: ui-monospace, Consolas, monospace; }
.readout { font-family: ui-monospace, Consolas, monospace; font-size: 12px; color: var(--muted); }
.name-readout { color: var(--text); font-size: 13px; }

.seg {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.seg button {
  flex: 1;
  padding: 7px 12px;
  background: var(--surface-2);
  color: var(--muted);
  border: none;
  font: inherit;
  cursor: pointer;
}
.seg button.on { background: var(--accent); color: #0b1020; font-weight: 600; }

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font: inherit;
  cursor: pointer;
}
.btn-secondary:hover { background: var(--border); }

.output {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  min-height: 400px;
}

.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tabs button {
  background: none; border: none; color: var(--muted);
  padding: 8px 14px; cursor: pointer; font: inherit;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tabs button.on { color: var(--text); border-bottom-color: var(--accent); }

.swatches {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 6px;
}
.swatches.compare { margin-top: 12px; opacity: 0.95; }
.swatch {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  display: flex; flex-direction: column;
  font-size: 10px;
  background: var(--surface-2);
}
.swatch .chip { height: 56px; width: 100%; }
.swatch .meta { padding: 5px 6px; display: flex; flex-direction: column; gap: 2px; font-family: ui-monospace, Consolas, monospace; }
.swatch .step { font-weight: 600; color: var(--text); font-family: inherit; }
.swatch .oklch, .swatch .hex { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.swatch .delta { color: var(--muted); font-family: ui-monospace, Consolas, monospace; }

.code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.5;
  overflow: auto;
  margin: 0;
  white-space: pre;
}
.code-actions { display: flex; justify-content: flex-end; margin-bottom: 8px; gap: 6px; }

.demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 700px) { .demo-grid { grid-template-columns: 1fr; } }
.demo-card {
  border-radius: 10px;
  padding: 20px;
  border: 1px solid var(--demo-border);
  background: var(--demo-bg);
  color: var(--demo-text);
  display: flex; flex-direction: column; gap: 12px;
  font-family: system-ui, sans-serif;
}
.demo-card h3 { margin: 0; font-size: 18px; color: var(--demo-text); }
.demo-card p { margin: 0; color: var(--demo-muted); font-size: 13px; line-height: 1.55; }
.demo-card a { color: var(--demo-accent); text-decoration: underline; }
.demo-card .surface { background: var(--demo-surface); border-radius: 6px; padding: 12px; }
.demo-card .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.demo-card button.primary {
  background: var(--demo-accent); color: var(--demo-on-accent); border: none;
  padding: 8px 14px; border-radius: 6px; font: inherit; font-weight: 600; cursor: pointer;
}
.demo-card button.primary:hover { background: var(--demo-accent-hover); }
.demo-card button.secondary {
  background: transparent; color: var(--demo-text); border: 1px solid var(--demo-border);
  padding: 8px 14px; border-radius: 6px; font: inherit; cursor: pointer;
}
.demo-card .chip {
  font-family: ui-monospace, Consolas, monospace; font-size: 12px;
  background: var(--demo-surface); color: var(--demo-muted);
  padding: 2px 6px; border-radius: 4px; border: 1px solid var(--demo-border);
}
.demo-card .divider { height: 1px; background: var(--demo-border); margin: 4px 0; }

.coord-intro { margin: 0 0 12px; color: var(--muted); font-size: 13px; line-height: 1.55; }
.coord-bg-controls { display: flex; gap: 16px; margin-bottom: 16px; }
.coord-bg-field { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
.coord-seg button { padding: 4px 10px; font-size: 12px; }
.coord-grid { display: grid; gap: 20px; grid-template-columns: 1fr; }

.coord-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex; flex-direction: column; gap: 12px;
}
.coord-card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.coord-card-head h3 { margin: 0; font-size: 14px; font-weight: 600; }
.coord-card-title { display: flex; align-items: baseline; gap: 8px; }
.coord-card-actions { display: flex; gap: 6px; }
.coord-card-actions .btn-secondary { padding: 4px 10px; font-size: 12px; }
.coord-offsets { color: var(--muted); font-family: ui-monospace, Consolas, monospace; font-size: 12px; }

.coord-roles { display: flex; flex-direction: column; gap: 8px; }
.coord-role { display: flex; flex-direction: column; gap: 4px; }
.coord-role-head { display: flex; justify-content: space-between; font-size: 11px; }
.coord-role-label { color: var(--text); font-weight: 500; }
.coord-role-meta { color: var(--muted); font-family: ui-monospace, Consolas, monospace; }

.coord-strip { display: grid; grid-template-columns: repeat(11, 1fr); gap: 2px; }
.coord-chip {
  height: 22px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.coord-demo { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 700px) { .coord-demo { grid-template-columns: 1fr; } }
.coord-demo .demo-card { padding: 16px; gap: 12px; }
.coord-demo .demo-card h3 { font-size: 15px; }
.coord-demo .demo-card p { font-size: 13px; }
.coord-demo .demo-card p.muted { color: var(--demo-muted); font-size: 12px; margin: 0; }
.coord-demo .demo-card .tag {
  font-size: 10px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 2px 6px; border-radius: 3px;
  background: var(--demo-accent); color: var(--demo-on-accent);
}
.coord-demo .demo-card .dot {
  width: 8px; height: 8px; border-radius: 50%;
  margin-left: auto;
}
.coord-demo .demo-card .code-row { margin-top: 8px; }
.coord-demo .accent-chip {
  font-size: 11px; font-weight: 600;
  padding: 4px 8px; border-radius: 4px;
}

.syntax-demo { grid-template-columns: 1fr 1fr; }
@media (max-width: 900px) { .syntax-demo { grid-template-columns: 1fr; } }
.syntax-code {
  background: var(--syn-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex; flex-direction: column;
}
.syntax-code-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; flex-wrap: wrap;
  padding: 8px 12px;
  border-bottom: 1px solid rgba(127,127,127,0.18);
  background: color-mix(in oklab, var(--syn-bg) 85%, var(--syn-fg) 15%);
  font-size: 11px;
}
.syntax-variant {
  color: var(--syn-fg);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.75;
}
.token-legend {
  display: flex; flex-wrap: wrap; gap: 10px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 11px;
}
.token-legend .leg { font-weight: 600; }
.syntax-pre {
  margin: 0;
  padding: 14px 16px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--syn-fg);
  overflow: auto;
  white-space: pre;
}
.syntax-pre .c { color: var(--syn-muted); font-style: italic; }
.syntax-pre .k { color: var(--syn-keyword); font-weight: 600; }
.syntax-pre .s { color: var(--syn-string); }
.syntax-pre .n { color: var(--syn-number); }
.syntax-pre .f { color: var(--syn-function); }
.syntax-pre .t { color: var(--syn-type); }
.syntax-pre .v { color: var(--syn-fg); }