/* Radiant Slab calculator. Shell tokens (--paper, --ink, ...) come from ../shell.css. */
:root {
  --room: #e6eef6;
  --carpet: #c79a64;
  --carpet-ink: #33230f;
  --slab: #b9bcc0;
  --slab-ink: #1d2126;
  --water: #1f6fc9;
  --hot: #c93a27;
  --accent: #0d6e6e;
  --input-bg: #fffef8;
  --input-ink: #000000;
  --chip: rgb(0 0 0 / .07);
  --warn: #a24a12;
}
@media (prefers-color-scheme: dark) {
  :root {
    --room: #1b2633;
    --carpet: #8a6a44;
    --carpet-ink: #f6e8d4;
    --slab: #4a4f56;
    --slab-ink: #eef0f2;
    --water: #5aa2f0;
    --hot: #f0705c;
    --accent: #4cc3c3;
    --input-bg: #23272b;
    --input-ink: #f3f4f1;
    --chip: rgb(255 255 255 / .1);
    --warn: #e39a5c;
  }
}

.title { font-size: clamp(3rem, 9vw, 6.5rem); }

/* The section card needs about 690px to keep its labels on one line. */
.layout { display: grid; grid-template-columns: minmax(690px, 1.4fr) minmax(0, 1fr); gap: 16px; margin-top: clamp(24px, 4.5vh, 44px); font-size: 14px; line-height: 1.4; }
.stack { display: grid; gap: 16px; align-content: start; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.card h2 { margin: 0 0 10px; color: var(--graphite); font-size: 13px; font-weight: 600; letter-spacing: .6px; text-transform: uppercase; }

/* Cross-section */
.xs { display: grid; grid-template-columns: 172px minmax(0, 1fr); gap: 0 12px; }
.loop { grid-row: 1 / span 5; display: flex; flex-direction: column; justify-content: center; gap: 10px; padding: 8px; border-right: 1px dashed var(--line); }
.loop input[type=number] { width: 66px; }
.band { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; padding: 10px 12px; }
.band.room { background: var(--room); border-radius: 8px 8px 0 0; }
.band.carpet, .band.ceiling { background: var(--carpet); color: var(--carpet-ink); }
.band.slab { display: grid; grid-template-columns: 1fr auto; min-height: 150px; background: var(--slab); color: var(--slab-ink); }
.band.below { background: var(--room); border-radius: 0 0 8px 8px; }
.slab-fields { display: flex; flex-direction: column; gap: 8px; }
.slab-fields.tube { align-items: center; }
.pipe {
  display: grid; place-items: center; align-self: center;
  width: 92px; height: 92px; padding: 6px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #d24a36, #96220f);
  box-shadow: 0 0 0 6px rgb(0 0 0 / .08);
  color: #fff; font-size: 12px; font-weight: 600; text-align: center; text-shadow: 0 1px 2px rgb(0 0 0 / .35);
}
.pipe.cool { background: radial-gradient(circle at 35% 35%, #2f78c9, #123f7a); }

label.f { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
label.f .u { font-size: 12px; opacity: .78; }
input[type=number] {
  width: 74px; padding: 4px 6px;
  border: 1px solid var(--line); border-radius: 5px;
  background: var(--input-bg); color: var(--input-ink);
  font: inherit; font-variant-numeric: tabular-nums;
}
input[type=number]:focus { outline: 2px solid var(--accent); outline-offset: 0; }
input:disabled { opacity: .55; }
button { padding: 4px 10px; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); color: var(--ink); font: inherit; cursor: pointer; }
button:hover { border-color: var(--graphite); }

.out { padding: 2px 8px; border-radius: 5px; background: var(--chip); font-weight: 650; font-variant-numeric: tabular-nums; }
.note { color: var(--graphite); font-size: 12px; }
.band .note { color: inherit; opacity: .85; }
.note.after { margin: 10px 0 0; }
.err { margin-top: 8px; color: var(--warn); font-size: 13px; }

/* Results */
.kpis { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.kpi { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; }
.kpi .k { color: var(--graphite); font-size: 12px; }
.kpi .v { margin-top: 2px; font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; }
.kpi .v small { margin-left: 4px; color: var(--graphite); font-size: 12px; font-weight: 500; }
.kpi .s { color: var(--graphite); font-size: 11px; }
.heat { color: var(--hot); }
.cool { color: var(--water); }

/* Chart */
#chart { display: block; width: 100%; height: auto; }
#chart text { fill: var(--graphite); font-size: 11px; }
#chart .grid { stroke: var(--line); }
#chart .room { stroke: var(--graphite); stroke-dasharray: 4 4; }
#chart .floor, #chart .water { fill: none; stroke-width: 2; }
#chart .floor { stroke: var(--hot); }
#chart .water { stroke: var(--water); }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 6px; color: var(--graphite); font-size: 12px; }
.sw { display: inline-block; width: 14px; height: 3px; margin-right: 5px; border-radius: 2px; vertical-align: middle; }
.sw.water { background: var(--water); }
.sw.floor { background: var(--hot); }
.sw.room { background: var(--graphite); }

/* Resistance table */
#rtable { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
#rtable td, #rtable th { padding: 4px 6px; border-bottom: 1px solid var(--line); text-align: right; }
#rtable th { color: var(--graphite); font-size: 12px; font-weight: 600; }
#rtable td:nth-child(1), #rtable th:nth-child(1), #rtable td:nth-child(4), #rtable th:nth-child(4) { text-align: left; }
#rtable td:nth-child(4), #rtable th:nth-child(4) { padding-left: 14px; }
#rtable td:nth-child(3), #rtable th:nth-child(3), #rtable td:nth-child(6), #rtable th:nth-child(6) { width: 22%; }
.bar { height: 8px; border-radius: 4px; background: var(--accent); opacity: .75; }

.adv { margin-top: 10px; }
.adv summary { color: var(--graphite); font-size: 13px; cursor: pointer; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 10px; }

.foot { margin: 20px 0 0; max-width: 90ch; color: var(--graphite); font-size: 12px; }

@media (max-width: 1239px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 800px) {
  .xs { grid-template-columns: minmax(0, 1fr); }
  .loop { grid-row: auto; flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: flex-start; gap: 10px 18px; border-right: 0; border-bottom: 1px dashed var(--line); }
}
@media (max-width: 600px) {
  label.f { flex-wrap: wrap; white-space: normal; }
  .band.slab { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: 1fr; }
  #rtable td:nth-child(3), #rtable th:nth-child(3), #rtable td:nth-child(6), #rtable th:nth-child(6) { display: none; }
}