/* ===================================================================
   FLEXIGAS GAS PIPE SIZING CALCULATOR, scoped styles (.gsc-*)
   Builds on flexigas-website-2026.css tokens. Brand colours ONLY:
   black (--black), white (--white), yellow (--yellow) plus the
   functional greys (--ink, --muted, --line, --soft). No green, no red.
   PASS is expressed with yellow. FAIL/over-budget is a solid black
   panel with white text. Light-first, mobile-first, 44px tap targets.
   House rule: zero em dashes anywhere in this file.
   =================================================================== */

.gsc-tool { padding: 30px 16px 56px; background: var(--soft); }
.gsc-inner { max-width: var(--max); margin: 0 auto; }
.gsc-tool-head { text-align: center; margin: 0 0 22px; }
.gsc-tool-head h2 { font-family: var(--font-display); font-size: 28px; font-weight: 800; letter-spacing: -0.02em; margin: 4px 0 6px; color: var(--black); }
.gsc-tool-head p { font-size: 15px; color: var(--muted); margin: 0; }

/* ---- Lead-capture gate ---- */
.gsc-gate { max-width: 560px; margin: 0 auto; background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: 28px 26px; box-shadow: 0 18px 44px rgba(0,0,0,.07); position: relative; overflow: hidden; }
.gsc-gate::before { content: ""; position: absolute; top: 0; left: 0; width: 72px; height: 4px; background: var(--yellow); }
.gsc-gate-head h3 { font-family: var(--font-display); font-size: 22px; font-weight: 800; letter-spacing: -0.01em; margin: 6px 0 8px; color: var(--black); }
.gsc-gate-head p { font-size: 14px; line-height: 1.55; color: var(--muted); margin: 0 0 18px; }
.gsc-gate-stub { display: grid; gap: 12px; }
.gsc-gate-stub label { display: grid; gap: 6px; font-size: 12px; font-weight: 700; color: var(--ink); }
.gsc-gate-stub input, .gsc-gate-stub select { width: 100%; min-height: 46px; padding: 12px 13px; font-size: 15px; font-family: var(--font-body); border: 1px solid #c7c7c7; border-radius: 6px; background: var(--white); color: var(--ink); }
.gsc-gate-stub input:focus, .gsc-gate-stub select:focus { outline: none; border-color: var(--black); box-shadow: 0 0 0 3px rgba(249,201,0,.35); }
.gsc-gate-hint { font-size: 11.5px; font-weight: 500; color: var(--muted); margin: -2px 0 0; }
.gsc-gate-submit { margin-top: 4px; min-height: 48px; padding: 14px 18px; font-size: 15px; font-weight: 800; font-family: var(--font-display); background: var(--yellow); color: var(--black); border: 0; border-radius: 4px; cursor: pointer; transition: transform .12s ease, box-shadow .12s ease; }
.gsc-gate-submit:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(249,201,0,.4); }
.gsc-gate-embed { min-height: 40px; }
.gsc-gate-fine { font-size: 11.5px; line-height: 1.5; color: var(--muted); margin: 16px 0 0; }
.gsc-gate-fine a { color: var(--ink); }

/* ---- Calculator shell (hidden until gate cleared) ---- */
.gsc-calc { display: none; }
.gsc-calc.is-unlocked { display: block; }
.gsc-workbench { display: grid; grid-template-columns: minmax(300px, 380px) minmax(0, 1fr); gap: 22px; align-items: start; }
.gsc-config { display: grid; gap: 16px; position: sticky; top: 90px; }
.gsc-output { min-width: 0; }

.gsc-card { background: var(--white); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.gsc-card > h3 { font-family: var(--font-display); font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }
.gsc-card-note { font-size: 12.5px; color: var(--muted); margin: 0 0 14px; line-height: 1.45; }
.gsc-label { display: block; font-size: 12px; font-weight: 700; color: var(--ink); margin: 0 0 7px; }

/* segmented control */
.gsc-seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.gsc-seg button { flex: 1; min-height: 46px; padding: 11px 8px; font-size: 13px; font-weight: 700; font-family: var(--font-body); background: var(--white); color: var(--ink); border: 0; border-right: 1px solid var(--line); cursor: pointer; }
.gsc-seg button:last-child { border-right: 0; }
.gsc-seg button.is-active { background: var(--black); color: var(--yellow); }
.gsc-seg button:disabled { color: #b9b9b9; cursor: not-allowed; background: var(--soft); }
.gsc-seg button .gsc-soon { display: block; font-size: 9px; font-weight: 800; letter-spacing: .08em; color: #b9b9b9; }
.gsc-seg-hint { font-size: 11.5px; color: var(--muted); margin: 8px 0 0; }

/* appliance picker */
.gsc-add-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-bottom: 12px; }
.gsc-add-row select { width: 100%; min-height: 46px; padding: 12px 11px; font-size: 14px; font-family: var(--font-body); border: 1px solid #c7c7c7; border-radius: 8px; background: var(--white); color: var(--ink); }
.gsc-add-btn { min-height: 46px; padding: 0 16px; font-size: 14px; font-weight: 800; font-family: var(--font-display); background: var(--yellow); color: var(--black); border: 0; border-radius: 8px; cursor: pointer; }
.gsc-add-btn:hover { background: var(--yellow-2); }
.gsc-appliance-list { display: grid; gap: 8px; }
.gsc-appliance-row { display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; align-items: center; background: var(--soft); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.gsc-ar-name { font-size: 13px; font-weight: 700; color: var(--ink); min-width: 0; }
.gsc-ar-rate { display: inline-flex; align-items: center; gap: 4px; }
.gsc-ar-rate input { width: 56px; min-height: 38px; padding: 7px 6px; font-size: 14px; text-align: right; border: 1px solid #c7c7c7; border-radius: 6px; background: var(--white); color: var(--ink); font-variant-numeric: tabular-nums; }
.gsc-ar-rate input:focus { outline: none; border-color: var(--black); box-shadow: 0 0 0 3px rgba(249,201,0,.35); }
.gsc-ar-rate span { font-size: 11px; color: var(--muted); white-space: nowrap; }
.gsc-step { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: var(--white); }
.gsc-step button { width: 38px; height: 38px; border: 0; background: var(--white); color: var(--ink); font-size: 18px; line-height: 1; cursor: pointer; }
.gsc-step button:hover { background: var(--soft); }
.gsc-step span { min-width: 26px; text-align: center; font-size: 14px; font-weight: 700; font-variant-numeric: tabular-nums; }
.gsc-ar-remove { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); color: var(--muted); font-size: 18px; cursor: pointer; }
.gsc-ar-remove:hover { border-color: var(--black); color: var(--black); }
.gsc-appliance-empty { font-size: 12.5px; color: var(--muted); padding: 10px 0; text-align: center; }
.gsc-load-total { display: flex; justify-content: space-between; align-items: baseline; margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); }
.gsc-load-total span { font-size: 12px; font-weight: 700; color: var(--muted); }
.gsc-load-total strong { font-family: var(--font-display); font-size: 18px; font-weight: 800; color: var(--black); font-variant-numeric: tabular-nums; }

/* total-kw / custom-rate alternate input */
.gsc-numeric { display: flex; align-items: center; border: 1px solid #c7c7c7; border-radius: 8px; overflow: hidden; }
.gsc-numeric input { flex: 1; min-width: 0; min-height: 48px; padding: 12px 13px; font-size: 16px; border: 0; background: var(--white); color: var(--ink); font-variant-numeric: tabular-nums; }
.gsc-numeric input:focus { outline: none; }
.gsc-numeric:focus-within { border-color: var(--black); box-shadow: 0 0 0 3px rgba(249,201,0,.35); }
.gsc-numeric .gsc-unit { padding: 0 13px; font-size: 13px; font-weight: 700; color: var(--muted); background: var(--soft); align-self: stretch; display: flex; align-items: center; }

/* fittings */
.gsc-fittings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.gsc-fit { display: grid; gap: 6px; }
.gsc-fit label { font-size: 12px; font-weight: 700; color: var(--ink); line-height: 1.2; }
.gsc-fit label small { display: block; font-weight: 500; color: var(--muted); font-size: 10.5px; }
.gsc-fit .gsc-step { width: 100%; justify-content: space-between; }

/* advanced */
.gsc-advanced { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--white); }
.gsc-advanced summary { list-style: none; cursor: pointer; min-height: 50px; padding: 15px 18px; display: flex; justify-content: space-between; gap: 12px; align-items: center; font-family: var(--font-display); font-size: 13px; font-weight: 800; color: var(--black); }
.gsc-advanced summary::-webkit-details-marker { display: none; }
.gsc-advanced summary span { font-family: var(--font-body); font-size: 11.5px; font-weight: 500; color: var(--muted); }
.gsc-advanced-body { border-top: 1px solid var(--line); padding: 16px 18px; display: grid; gap: 16px; }
.gsc-range label { display: flex; justify-content: space-between; font-size: 12px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.gsc-range label span { font-family: var(--font-display); color: var(--black); font-variant-numeric: tabular-nums; }
.gsc-range input[type="range"] { width: 100%; accent-color: var(--yellow); height: 28px; }
.gsc-range p { margin: 6px 0 0; font-size: 11px; line-height: 1.4; color: var(--muted); }

/* ===== VERDICT CARD ===== */
/* PASS: dark premium card, big YELLOW size, yellow pill. */
/* FAIL: solid black panel, WHITE text, no yellow. */
.gsc-verdict { background: #0c0c0c; color: var(--white); border-radius: 12px; padding: 24px; margin: 0 0 16px; box-shadow: 0 18px 46px rgba(0,0,0,.22); overflow: hidden; }
.gsc-verdict-top { display: grid; grid-template-columns: auto minmax(0,1fr); gap: 20px; align-items: center; }
.gsc-verdict-size { font-family: var(--font-display); font-weight: 900; font-size: 60px; line-height: .9; letter-spacing: -.02em; color: var(--yellow); }
.gsc-verdict-size small { display: block; font-size: 11px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: rgba(255,255,255,.5); margin-bottom: 6px; }
.gsc-verdict-headline { font-family: var(--font-display); font-size: 19px; font-weight: 700; line-height: 1.25; margin: 0 0 6px; color: var(--white); }
.gsc-verdict-sub { font-size: 13px; line-height: 1.5; color: rgba(255,255,255,.74); margin: 0; }
.gsc-verdict-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.gsc-kpi { border: 1px solid rgba(255,255,255,.14); border-radius: 8px; padding: 12px; background: rgba(255,255,255,.05); }
.gsc-kpi span { display: block; font-size: 10px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.5); margin-bottom: 5px; }
.gsc-kpi strong { display: block; font-family: var(--font-display); font-size: 21px; font-weight: 800; color: var(--white); font-variant-numeric: tabular-nums; line-height: 1; }
.gsc-kpi em { display: block; font-style: normal; font-size: 11px; color: rgba(255,255,255,.6); margin-top: 4px; }
.gsc-verdict-pill { display: inline-flex; align-items: center; gap: 7px; margin-top: 16px; padding: 9px 14px; border-radius: 999px; font-size: 12px; font-weight: 800; letter-spacing: .03em; background: var(--yellow); color: var(--black); }
.gsc-verdict-pill svg { width: 15px; height: 15px; }

/* FAIL state: no yellow, white "size up" treatment */
.gsc-verdict.is-fail .gsc-verdict-size { color: var(--white); font-size: 40px; }
.gsc-verdict.is-fail .gsc-verdict-pill { background: transparent; color: var(--white); border: 1.5px solid var(--white); }

/* ===== SIZING LADDER ===== */
.gsc-ladder { margin: 0 0 16px; background: var(--white); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.gsc-ladder > summary { list-style: none; cursor: pointer; min-height: 52px; padding: 16px 18px; display: flex; justify-content: space-between; align-items: center; gap: 12px; font-family: var(--font-display); font-size: 15px; font-weight: 800; color: var(--black); }
.gsc-ladder > summary::-webkit-details-marker { display: none; }
.gsc-ladder > summary span { font-family: var(--font-body); font-size: 12px; font-weight: 500; color: var(--muted); }
.gsc-ladder-rows { display: grid; gap: 7px; padding: 0 18px 18px; }
.gsc-rung { display: grid; grid-template-columns: 64px 1fr auto; gap: 12px; align-items: center; background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 11px 14px; }
.gsc-rung.is-pick { border-color: var(--black); border-width: 2px; padding: 10px 13px; background: #fffdf2; }
.gsc-rung.is-fail { opacity: .7; }
.gsc-rung-dn { font-family: var(--font-display); font-size: 18px; font-weight: 800; color: var(--black); font-variant-numeric: tabular-nums; }
.gsc-rung-dn small { display: block; font-size: 10px; font-weight: 600; color: var(--muted); letter-spacing: .04em; }
.gsc-rung-bar { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.gsc-rung-bar i { display: block; height: 100%; border-radius: 4px; }
.gsc-rung-meta { font-size: 11.5px; color: var(--muted); margin: 5px 0 0; font-variant-numeric: tabular-nums; }
.gsc-rung-status { font-size: 11px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; white-space: nowrap; padding: 5px 10px; border-radius: 999px; }
.gsc-rung-status.pick { background: var(--black); color: var(--yellow); }
.gsc-rung-status.ok { background: rgba(249,201,0,.22); color: #7a6300; }
.gsc-rung-status.fail { background: var(--soft); color: var(--muted); }

/* ===== INSTALL REFERENCE + STANDARDS ===== */
.gsc-ref { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin: 0 0 16px; }
.gsc-ref-cell { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 14px; }
.gsc-ref-cell span { display: block; font-size: 10px; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.gsc-ref-cell strong { display: block; font-family: var(--font-display); font-size: 18px; font-weight: 800; color: var(--black); font-variant-numeric: tabular-nums; }
.gsc-ref-cell em { font-style: normal; font-size: 11.5px; color: var(--muted); }

.gsc-standards { background: var(--white); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin: 0 0 14px; }
.gsc-standards-tags { display: flex; flex-wrap: wrap; gap: 6px 8px; margin: 0 0 12px; }
.gsc-standards-tags span { font-size: 11px; font-weight: 700; color: var(--ink); background: var(--soft); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; }
.gsc-cite { font-size: 12px; color: var(--muted); margin: 0 0 10px; font-weight: 600; }
.gsc-disclaimer { font-size: 12px; line-height: 1.55; color: var(--muted); margin: 0; }
.gsc-disclaimer strong { color: var(--ink); }

.gsc-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.gsc-action { display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 12px 18px; font-size: 13px; font-weight: 800; font-family: var(--font-display); border-radius: 4px; cursor: pointer; border: 1px solid var(--line); background: var(--white); color: var(--ink); }
.gsc-action.is-primary { background: var(--yellow); color: var(--black); border-color: var(--yellow); }
.gsc-action.is-primary:hover { background: var(--yellow-2); }
.gsc-action svg { width: 16px; height: 16px; }
.gsc-app-note { font-size: 12px; color: var(--muted); margin: 14px 0 0; text-align: center; }
.gsc-app-note a { color: var(--ink); font-weight: 700; }

@media (max-width: 920px) {
  .gsc-workbench { grid-template-columns: 1fr; }
  .gsc-config { position: static; }
}
@media (max-width: 560px) {
  .gsc-verdict-top { grid-template-columns: 1fr; gap: 12px; }
  .gsc-verdict-size { font-size: 54px; }
  .gsc-verdict-kpis { grid-template-columns: 1fr 1fr; }
  .gsc-ref { grid-template-columns: 1fr; }
  .gsc-fittings-grid { grid-template-columns: 1fr; }
}