:root {                    /* default: Royal — royal blue & gold */
  --bg: #0d1322; --panel: #15203a; --panel2: #1d2b4e; --line: #2b3c66;
  --text: #e9ecf5; --muted: #96a2c4; --accent: #d9b45b;
  --up: #66c98a; --down: #e0716f;
}
html[data-theme="ember"] {
  --bg: #111318; --panel: #191c24; --panel2: #222633; --line: #2a2f3c;
  --text: #eae7e0; --muted: #9298a8; --accent: #e5a558;
  --up: #69c98a; --down: #e0716f;
}
html[data-theme="ice"] {
  --bg: #0d1418; --panel: #141d23; --panel2: #1c2830; --line: #263540;
  --text: #e4ebee; --muted: #8fa3ad; --accent: #56c3dc;
  --up: #69c98a; --down: #e0716f;
}
html[data-theme="nocturne"] {
  --bg: #141020; --panel: #1c1730; --panel2: #262040; --line: #322a52;
  --text: #eae6f2; --muted: #9d94b8; --accent: #a78bda;
  --up: #69c98a; --down: #e0716f;
}
html[data-theme="paper"] { /* light */
  --bg: #f5f2ec; --panel: #fdfbf7; --panel2: #ece6d8; --line: #d8d1c0;
  --text: #29261f; --muted: #7a7468; --accent: #8a6d1d;
  --up: #1a8f4a; --down: #c04543;
}
:root {
  --accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --up-soft: color-mix(in srgb, var(--up) 14%, transparent);
  --down-soft: color-mix(in srgb, var(--down) 14%, transparent);
  --radius: 14px;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { background: var(--bg); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  max-width: 640px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 14px)
           calc(env(safe-area-inset-right) + 16px)
           calc(env(safe-area-inset-bottom) + 28px)
           calc(env(safe-area-inset-left) + 16px);
  -webkit-tap-highlight-color: transparent;
}
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
.theme-row { margin-top: 26px; display: flex; align-items: center; gap: 12px; justify-content: center; }
.theme-label { color: var(--muted); font-size: 0.75rem; }
.theme-dot { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--line); padding: 0; }
.theme-dot.sel { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.foot-note { color: var(--muted); font-size: 0.72rem; text-align: center; margin-top: 8px; line-height: 1.5; }

/* ================= Barrel app styles (CSS vars only) ================= */

.app-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding: 2px 2px 0; }
.app-title { font-size: 1.3rem; font-weight: 700; }
.app-sub { color: var(--muted); font-size: 0.72rem; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  margin-top: 12px;
}
.card > * + * { margin-top: 10px; }
.sec-head {
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* input rows */
.row { display: flex; gap: 10px; align-items: flex-end; }
.row > * { flex: 1; min-width: 0; }
.row > .w2 { flex: 1.35; }

.field label, .flabel {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  margin-bottom: 5px;
}
.field input, .field select {
  width: 100%;
  font-size: 16px;             /* >=16px stops iOS focus zoom */
  padding: 8px 10px;
  background: var(--panel2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 9px;
}
.field input { appearance: none; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.field input::placeholder { color: var(--muted); opacity: 0.55; }
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }

/* segmented selectors */
.seg { display: flex; gap: 6px; }
.seg button {
  flex: 1;
  min-width: 0;
  padding: 8px 4px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel2);
  color: var(--muted);
  font-size: 0.85rem;
}
.seg button.sel {
  color: var(--text);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* computed results: value + formula line beneath (assumptions never buried) */
.results .res { padding: 8px 2px 7px; }
.results .res + .res { border-top: 1px solid var(--line); }
.res-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.res-label { font-size: 0.85rem; }
.res-label .unit { color: var(--muted); font-size: 0.68rem; margin-left: 6px; }
.res-val { font-size: 1.05rem; white-space: nowrap; }
.res-formula {
  color: var(--muted);
  font-size: 0.7rem;
  margin-top: 3px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.spec-line { color: var(--muted); font-size: 0.74rem; }

.quickref { border-top: 1px dashed var(--line); padding-top: 10px; }
.qr-title { color: var(--muted); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 4px; }
.qr { display: flex; gap: 8px; color: var(--muted); font-size: 0.72rem; padding: 2px 0; }
.qr-sym { flex: none; width: 2em; }
.qr.cur { color: var(--text); }
.qr.cur .qr-sym { color: var(--accent); }

.btn {
  display: block;
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.92rem;
}
.btn:active { transform: translateY(1px); }

/* snapshots */
.snap-row { display: flex; align-items: center; gap: 8px; }
.snap-row + .snap-row { border-top: 1px solid var(--line); }
.snap-load { flex: 1; min-width: 0; display: block; text-align: left; padding: 8px 2px; }
.snap-time { display: block; color: var(--muted); font-size: 0.68rem; }
.snap-sum { display: block; font-size: 0.72rem; margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.snap-del {
  flex: none;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel2);
  color: var(--muted);
  font-size: 0.72rem;
}
.snap-del.arm { color: var(--down); border-color: var(--down); background: var(--down-soft); }

.empty {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 14px;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
  line-height: 1.5;
}