/* Firewood & BTU calculators — clean, fast, mobile-first. System fonts only. */
:root {
  --bg: #faf7f2;
  --surface: #ffffff;
  --ink: #2b2620;
  --muted: #6b6257;
  --line: #e7dfd2;
  --ember: #b3541e;
  --ember-dark: #8f4215;
  --moss: #3f6b4f;
  --warn-bg: #fdf3e7;
  --warn-line: #e8b04b;
  --radius: 10px;
  --maxw: 68rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 1.05rem;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header {
  background: var(--ink);
  color: #f5efe6;
  padding: 1rem 0;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.15rem; color: #fff; text-decoration: none; }
.brand span { color: var(--warn-line); }
.site-nav a { color: #e9dfcf; text-decoration: none; margin-left: 1.1rem; font-size: .95rem; }
.site-nav a:hover { color: #fff; text-decoration: underline; }

/* Hero */
.hero { padding: 2.5rem 0 1.5rem; }
.hero h1 { font-size: clamp(1.7rem, 4.5vw, 2.6rem); line-height: 1.2; margin: 0 0 .6rem; }
.hero p.lede { font-size: 1.12rem; color: var(--muted); max-width: 60ch; margin: 0; }

/* Cards / calculators */
.calc-grid { display: grid; gap: 1.5rem; margin: 2rem 0; }
@media (min-width: 60rem) { .calc-grid { grid-template-columns: 1fr 1fr; } }
.calc-grid .span-2 { grid-column: 1 / -1; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
}
.card h2 { margin-top: 0; font-size: 1.35rem; }
.card h2 .tag {
  display: inline-block; font-size: .72rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .04em; background: var(--warn-bg); border: 1px solid var(--warn-line);
  color: var(--ember-dark); border-radius: 999px; padding: .15rem .6rem; margin-left: .5rem; vertical-align: middle;
}

.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 600; margin-bottom: .3rem; }
.field .hint { font-size: .88rem; color: var(--muted); font-weight: 400; display: block; margin-top: .15rem; }
.field input[type="number"], .field select {
  width: 100%; padding: .65rem .75rem; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink);
}
.field input[type="number"]:focus, .field select:focus { outline: 2px solid var(--ember); border-color: var(--ember); }
.field-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
@media (max-width: 34rem) { .field-row { grid-template-columns: 1fr; } }

input[type="range"] { width: 100%; accent-color: var(--ember); }

.btn {
  display: inline-block; background: var(--ember); color: #fff; border: none;
  font-size: 1rem; font-weight: 700; padding: .75rem 1.4rem; border-radius: 6px; cursor: pointer;
}
.btn:hover { background: var(--ember-dark); }

.results {
  margin-top: 1.1rem; padding: 1rem 1.1rem; background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; display: none;
}
.results.show { display: block; }
.results dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: .3rem 1rem; }
.results dt { font-weight: 600; }
.results dd { margin: 0; }
.results .big { font-size: 1.5rem; font-weight: 800; color: var(--ember-dark); }

.moisture-note {
  margin-top: 1rem; padding: .85rem 1rem; background: var(--warn-bg);
  border-left: 4px solid var(--warn-line); border-radius: 0 8px 8px 0; font-size: .95rem;
}
.moisture-note strong { color: var(--ember-dark); }

/* Species table */
.species-table { width: 100%; border-collapse: collapse; font-size: .95rem; margin-top: 1rem; }
.species-table th, .species-table td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); }
.species-table th { font-size: .85rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
.species-table tr:hover td { background: var(--bg); }
.heat-bar { height: .5rem; background: var(--line); border-radius: 999px; overflow: hidden; min-width: 90px; }
.heat-bar i { display: block; height: 100%; background: var(--ember); border-radius: 999px; }

/* Guides */
.guide-list { display: grid; gap: 1rem; margin: 1.5rem 0 2.5rem; }
@media (min-width: 48rem) { .guide-list { grid-template-columns: repeat(3, 1fr); } }
.guide-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; text-decoration: none; color: inherit; display: block; }
.guide-card:hover { border-color: var(--ember); }
.guide-card h3 { margin: 0 0 .4rem; color: var(--ember-dark); }
.guide-card p { margin: 0; color: var(--muted); font-size: .95rem; }

.prose { max-width: 66ch; }
.prose h2 { margin-top: 2rem; }
.callout { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.2rem; margin: 1.2rem 0; }

/* FAQ */
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: .9rem 1.1rem; margin-bottom: .7rem; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq p { margin: .5rem 0 0; color: var(--muted); }

/* Affiliate placeholder */
.gear { margin: 2.5rem 0; }
.gear-grid { display: grid; gap: 1rem; }
@media (min-width: 48rem) { .gear-grid { grid-template-columns: repeat(3, 1fr); } }
.gear-item { background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); padding: 1.1rem; }
.gear-item h3 { margin: 0 0 .35rem; font-size: 1.05rem; }
.gear-item p { margin: 0 0 .6rem; font-size: .92rem; color: var(--muted); }
.gear-item a { color: var(--ember-dark); font-weight: 600; }
.disclosure { font-size: .85rem; color: var(--muted); font-style: italic; }

/* Footer */
.site-footer { background: var(--ink); color: #cfc4b2; padding: 2rem 0; margin-top: 3rem; font-size: .92rem; }
.site-footer a { color: #e9dfcf; }
.site-footer p { margin: .3rem 0; }

/* Source labels */
.src { font-size: .82rem; color: var(--muted); }