/* chronicle playground — vanilla, self-contained, theme-aware.
   Colours are driven by CSS custom properties so light and dark share one
   layout. The bitemporal grid's own palette lives in app.js (SVG fills). */

:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-2: #f0f2f5;
  --ink: #1c2230;
  --ink-soft: #4a5568;
  --ink-faint: #7b8494;
  --line: #dfe3ea;
  --line-strong: #c4cad4;
  --accent: #2f6f4f;
  --accent-ink: #ffffff;
  --correction: #b5651d;
  --danger: #b02a37;
  --grid-bg: #fbfcfd;
  --crosshair: #d6336c;
  --shadow: 0 1px 3px rgba(20, 30, 50, 0.08), 0 6px 20px rgba(20, 30, 50, 0.05);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --panel: #171b24;
    --panel-2: #1e2430;
    --ink: #e6e9ef;
    --ink-soft: #aab3c2;
    --ink-faint: #7a8494;
    --line: #2a313e;
    --line-strong: #3a4353;
    --accent: #4caf7d;
    --accent-ink: #0b1410;
    --correction: #e0954a;
    --danger: #e5707b;
    --grid-bg: #12161e;
    --crosshair: #ff6ea6;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  font-size: 15px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--panel-2);
  padding: 0.08em 0.35em;
  border-radius: 4px;
}

/* ---------- top bar ---------- */
.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.topbar-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}
.topbar h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.tagline { margin: 0; color: var(--ink-soft); font-size: 14px; }
.links { margin-left: auto; display: flex; gap: 16px; font-size: 14px; }

main { max-width: 1240px; margin: 0 auto; padding: 20px; }

/* ---------- intro ---------- */
.intro { margin: 4px 0 18px; max-width: 62ch; }
.intro p { margin: 0 0 10px; }
.teaching-note {
  font-size: 13.5px;
  color: var(--ink-soft);
  border-left: 3px solid var(--line-strong);
  padding-left: 12px;
}

/* ---------- scenarios ---------- */
.scenarios {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.scenarios-label { color: var(--ink-soft); font-weight: 600; font-size: 14px; }
.scenario-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.scenario-note {
  margin: 4px 0 14px;
  padding: 10px 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

/* ---------- buttons ---------- */
.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  background: var(--accent);
  color: var(--accent-ink);
  transition: filter 0.12s ease, background 0.12s ease;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { filter: brightness(0.95); }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line-strong);
}
.btn.ghost:hover { background: var(--panel-2); filter: none; }
.btn.correction { background: var(--correction); color: #fff; }

.scenario-buttons .btn {
  background: var(--panel);
  color: var(--ink);
  border-color: var(--line-strong);
}
.scenario-buttons .btn:hover { background: var(--panel-2); filter: none; }
.scenario-buttons .btn.active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 1fr);
  gap: 18px;
  align-items: start;
}
@media (max-width: 940px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}
.side .panel:last-child { margin-bottom: 0; }
.panel h2 { margin: 0 0 8px; font-size: 16px; }
.panel-sub { margin: 0 0 12px; color: var(--ink-soft); font-size: 13px; }
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.panel-head h2 { margin: 0; }

/* ---------- grid panel ---------- */
.grid-controls { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.grid-hint { margin: 0 0 10px; color: var(--ink-soft); font-size: 13px; }
.grid-wrap {
  width: 100%;
  overflow-x: auto;
  background: var(--grid-bg);
  border: 1px solid var(--line);
  border-radius: 10px;
}
#grid { display: block; width: 100%; height: auto; min-width: 460px; }

.colormode { display: flex; align-items: center; gap: 6px; }
.mini-label { font-size: 12px; color: var(--ink-faint); }
.chip {
  font-family: inherit;
  font-size: 12.5px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 3px 11px;
  cursor: pointer;
}
.chip.active { background: var(--ink); color: var(--panel); border-color: var(--ink); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 10px 2px 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}
.legend .item { display: inline-flex; align-items: center; gap: 6px; }
.legend .swatch {
  width: 13px; height: 13px; border-radius: 3px;
  border: 1px solid rgba(0, 0, 0, 0.15);
  flex: none;
}

/* ---------- as-of explorer ---------- */
.asof { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 14px; }
.asof h3 { margin: 0 0 10px; font-size: 14px; }
.asof-sliders { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
@media (max-width: 560px) { .asof-sliders { grid-template-columns: 1fr; } }
.slider { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--ink-soft); }
.slider b { color: var(--ink); font-family: var(--mono); font-weight: 600; font-size: 12px; }
.slider input[type="range"] { width: 100%; accent-color: var(--crosshair); }
.asof-result {
  margin-top: 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  min-height: 42px;
}

/* ---------- forms ---------- */
.field { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--ink-soft); margin-bottom: 10px; }
.field.inline { flex-direction: row; align-items: center; gap: 8px; margin-bottom: 0; }
.field span em { color: var(--ink-faint); font-style: normal; font-size: 0.92em; }
.field input, .field textarea, .field select, .mini-select {
  font-family: inherit;
  font-size: 13.5px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 7px 9px;
}
.field textarea { font-family: var(--mono); font-size: 12.5px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
@media (max-width: 420px) { .grid2 { grid-template-columns: 1fr; } }

.clock-row { display: flex; align-items: flex-end; gap: 8px; }
.clock-row .field { flex: 1; margin-bottom: 0; }
.clock-hint { margin: 6px 0 12px; font-size: 12px; color: var(--ink-faint); }

.btn-row { display: flex; gap: 10px; margin-top: 4px; }
.write-msg { margin: 10px 0 0; font-size: 13px; min-height: 18px; }
.write-msg.ok { color: var(--accent); }
.write-msg.err { color: var(--danger); }

/* ---------- field history ---------- */
.fieldhistory { display: flex; flex-direction: column; gap: 8px; }
.fh-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--panel-2);
  font-size: 13px;
}
.fh-transition { font-family: var(--mono); font-size: 13px; }
.fh-transition .absent { color: var(--ink-faint); font-style: italic; }
.fh-transition .arrow { color: var(--ink-faint); margin: 0 6px; }
.fh-meta { color: var(--ink-soft); font-size: 12px; margin-top: 3px; }
.fh-empty { color: var(--ink-faint); font-size: 13px; }

/* ---------- badges ---------- */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 999px;
  vertical-align: middle;
}
.badge.assert { background: rgba(47, 111, 79, 0.16); color: var(--accent); }
.badge.correction { background: rgba(181, 101, 29, 0.18); color: var(--correction); }
.badge.remainder { background: rgba(120, 132, 148, 0.2); color: var(--ink-soft); }

/* ---------- records table ---------- */
.records-table { overflow-x: auto; }
table.recs { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.recs th, table.recs td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
table.recs th { color: var(--ink-faint); font-weight: 600; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.03em; }
table.recs td.val { font-family: var(--mono); }
table.recs tr.superseded td { color: var(--ink-faint); }
table.recs tr { cursor: pointer; }
table.recs tr:hover td { background: var(--panel-2); }
table.recs tr.hl td { background: rgba(214, 51, 108, 0.1); }
.filters { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--ink-soft); }
.check { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.mini-select { padding: 4px 6px; font-size: 12.5px; }

/* ---------- footer ---------- */
.footer { margin: 26px 0 8px; color: var(--ink-faint); font-size: 12.5px; text-align: center; }

/* ---------- boot overlay ---------- */
.boot {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--ink-soft);
  font-size: 15px;
  z-index: 50;
  transition: opacity 0.3s ease;
}
.boot.hidden { opacity: 0; pointer-events: none; }
.boot.error { color: var(--danger); }

/* ---------- SVG grid text ---------- */
#grid text { fill: var(--ink-soft); font-family: var(--sans); }
#grid .axis-title { fill: var(--ink); font-weight: 600; }
#grid .tick-line { stroke: var(--line); }
#grid .frame { stroke: var(--line-strong); fill: none; }
#grid .rec { cursor: pointer; }
#grid .rec:hover { filter: brightness(1.08); }
#grid .rec.selected { stroke: var(--crosshair); stroke-width: 2.5; }
#grid .rec-label { fill: #10151d; font-weight: 600; pointer-events: none; }
#grid .crosshair { stroke: var(--crosshair); stroke-width: 1.5; stroke-dasharray: 4 3; pointer-events: none; }
#grid .crosshair-dot { fill: var(--crosshair); pointer-events: none; }
#grid .now-label { fill: var(--ink-faint); font-style: italic; }