:root {
  --bg: #0b0f14;
  --panel: #141a22;
  --panel-2: #1b232d;
  --border: #2a3441;
  --text: #e6edf3;
  --muted: #8b97a5;
  --accent: #00ff66;      /* ECAM-style green for the corrected result */
  --amber: #ffbf00;       /* warnings and correction signs */
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.page-head { margin-bottom: 24px; }
.back {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
}
.back:hover { color: var(--text); }
.page-head h1 { font-size: 1.6rem; font-weight: 700; margin: 8px 0 4px; }
.page-head .sub { color: var(--muted); margin: 0; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.panel__title { font-size: 0.95rem; font-weight: 600; margin: 0 0 14px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.9rem; margin-bottom: 6px; }
.field__hint { margin: 8px 0 0; font-size: 0.75rem; color: var(--muted); line-height: 1.4; }
.field__hint:empty { display: none; }

input[type="text"], select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
  width: 100%;
  min-width: 0;
  font-variant-numeric: tabular-nums;
}
input[type="text"]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}
input::placeholder { color: var(--muted); opacity: 0.7; }

.btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn--quiet { background: none; border-color: transparent; color: var(--muted); }
.btn--armed { border-color: var(--amber); color: var(--amber); }

/* Method selector */
.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.seg label {
  display: flex; align-items: center; justify-content: center; text-align: center;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 6px; font-size: 0.85rem; line-height: 1.25; color: var(--muted); cursor: pointer;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label:has(input:checked) { border-color: var(--accent); color: var(--accent); }
.seg label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Readings */
.readings { display: grid; grid-template-columns: minmax(64px, auto) 1.4fr 1fr; gap: 8px 10px; align-items: center; }
.readings > label { font-size: 0.9rem; }
.readings__head { display: flex; align-items: center; gap: 8px; font-size: 0.75rem; color: var(--muted); }
.readings__head select { width: auto; padding: 4px 6px; font-size: 0.8rem; }
.angle { margin: 16px 0 0; }

/* Correction lines */
.lines__legend { margin: 0 0 12px; }
.lines__legend b { color: var(--amber); }
.lines__head, .line {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 78px 78px 26px;
  gap: 6px;
  align-items: center;
}
.lines__head { font-size: 0.72rem; color: var(--muted); padding-bottom: 4px; }
.lines__head[hidden] { display: none; }
.num { text-align: right; }
.line { padding: 8px 0; border-top: 1px solid var(--border); }
.line input[type="text"] { padding: 7px 8px; font-size: 0.85rem; }
.line__num input { text-align: right; }
.line__out { text-align: right; font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.line__sign {
  width: 34px; height: 34px; padding: 0; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--amber); font: inherit; font-size: 1.1rem; font-weight: 700; cursor: pointer;
}
.line__del { width: 26px; height: 34px; padding: 0; background: none; border: 0; color: var(--muted); font-size: 1.1rem; cursor: pointer; }
.line__del:hover { color: var(--text); }
.line__sign:focus-visible, .line__del:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.line__label { font-size: 0.85rem; line-height: 1.3; overflow-wrap: anywhere; }
.line__source { display: block; font-size: 0.68rem; color: var(--muted); line-height: 1.3; margin-top: 2px; overflow-wrap: anywhere; }
.line__qty { display: flex; gap: 4px; margin-top: 4px; }
.line__qty input[type="text"] { flex: 1 1 auto; width: 0; }
.line__qty select { flex: 0 0 auto; width: auto; padding: 5px 4px; font-size: 0.8rem; }
.density { margin: 12px 0 0; }
.density[hidden] { display: none; }
.density input { max-width: 120px; }
.adders { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-top: 12px; }
#partsNote[hidden] { display: none; }

/* Warnings */
.warnings { margin: 0 0 16px; }
.warnings:empty { margin: 0; }
.warnings .warn {
  background: rgba(255, 191, 0, 0.1);
  border: 1px solid var(--amber);
  color: var(--amber);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

/* Results */
.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.result { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; min-width: 0; }
.result--main { border-color: var(--accent); }
.result__label { font-size: 0.72rem; font-weight: 600; color: var(--muted); margin: 0 0 6px; text-transform: uppercase; letter-spacing: 0.03em; }
.result__value { margin: 0; font-size: 1.45rem; font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }
.result--main .result__value { color: var(--accent); }
.result__alt { margin: 0; font-size: 0.75rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.result__alt:empty { display: none; }
.kv { margin: 8px 0 0; }
.kv div { display: flex; justify-content: space-between; gap: 8px; font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; white-space: nowrap; }

.source { color: var(--muted); font-size: 0.75rem; line-height: 1.4; margin: 0 0 12px; }

.reference { border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); padding: 0 16px; }
.reference summary { cursor: pointer; padding: 14px 0; font-weight: 600; }
.reference__body { color: var(--muted); font-size: 0.8rem; padding-bottom: 14px; overflow-wrap: anywhere; }
.reference__body p { margin: 0 0 8px; }
.reference__body b { color: var(--text); font-weight: 600; }

.clear { text-align: center; margin-top: 12px; }
.foot { margin-top: 12px; color: var(--muted); font-size: 0.75rem; text-align: center; }

/* Phones: the item takes its own row, with weight and FS labelled underneath. */
@media (max-width: 480px) {
  .lines__head { display: none; }
  .line { grid-template-columns: 34px minmax(0, 1fr) minmax(0, 1fr) 26px; row-gap: 6px; }
  .line > :nth-child(1) { grid-column: 1; grid-row: 1; }
  .line > :nth-child(2) { grid-column: 2 / span 2; grid-row: 1; }
  .line > :nth-child(3) { grid-column: 2; grid-row: 2; }
  .line > :nth-child(4) { grid-column: 3; grid-row: 2; }
  .line > :nth-child(5) { grid-column: 4; grid-row: 1; }
  .line__num::before, .line__out::before {
    content: attr(data-label);
    display: block;
    font-size: 0.68rem;
    color: var(--muted);
    text-align: right;
    margin-bottom: 2px;
  }
  .adders { grid-template-columns: 1fr; }
  .seg label { font-size: 0.78rem; padding: 10px 4px; }
}