/* FireCred Fire Dynamics Calculators - site stylesheet */

:root {
  --navy: #1a2e46;
  --navy-soft: #2a3f5c;
  --navy-line: #d6dde7;
  --orange: #f5a623;
  --orange-dark: #d88a06;
  --red: #ff0000;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-input: #fffbe8;
  --bg-result: #fff4e0;
  --text: #1a2e46;
  --muted: #5a6a82;
  --shadow: 0 1px 2px rgba(26, 46, 70, 0.06);
  --radius: 6px;
  --head-font: 'Montserrat', 'Poppins', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --body-font: 'Poppins', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--orange-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--head-font);
  color: var(--navy);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 0.5em 0;
}
h1 { font-size: 1.9rem; }
h2 { font-size: 1.35rem; margin-top: 1.8em; }
h3 { font-size: 1.1rem; margin-top: 1.4em; color: var(--navy-soft); }
p, ul, ol { margin: 0 0 1em 0; }

/* ---- Layout ---- */
.site-header {
  background: var(--navy);
  color: #fff;
  border-bottom: 4px solid var(--orange);
}
.site-header .wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}
.site-header a.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}
.site-header img.brand-logo {
  height: 40px;
  width: auto;
  background: #fff;
  padding: 4px 8px;
  border-radius: 4px;
}
.site-header .brand-tag {
  font-family: var(--head-font);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.78);
  margin-left: 4px;
}
.site-header nav {
  margin-left: auto;
  display: flex;
  gap: 18px;
  align-items: center;
}
.site-header nav a {
  color: #fff;
  font-weight: 500;
  font-size: 0.95rem;
}
.site-header nav a:hover { color: var(--orange); text-decoration: none; }

.search-box {
  position: relative;
}
.search-box input {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font: inherit;
  padding: 6px 10px;
  border-radius: var(--radius);
  width: 200px;
}
.search-box input::placeholder { color: rgba(255,255,255,0.6); }
.search-box input:focus { outline: 2px solid var(--orange); background: #fff; color: var(--navy); }
.search-results {
  position: absolute;
  top: 110%;
  right: 0;
  background: #fff;
  border: 1px solid var(--navy-line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(26,46,70,0.18);
  min-width: 280px;
  z-index: 50;
  max-height: 360px;
  overflow-y: auto;
  display: none;
}
.search-results.open { display: block; }
.search-results a {
  display: block;
  padding: 8px 12px;
  color: var(--navy);
  border-bottom: 1px solid var(--bg-soft);
}
.search-results a:hover { background: var(--bg-soft); text-decoration: none; }
.search-results a small { display: block; color: var(--muted); font-size: 0.78rem; }

main.wrap, .wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

/* ---- Disclaimer banner ---- */
.disclaimer {
  background: #fff6f6;
  border-left: 4px solid var(--red);
  padding: 10px 14px;
  margin: 18px 0 24px;
  font-size: 0.9rem;
  color: var(--navy);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.disclaimer strong { color: var(--red); }

/* ---- Calculator layout ---- */
.calc-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 880px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.calc-inputs {
  background: var(--bg-soft);
  border: 1px solid var(--navy-line);
  border-radius: var(--radius);
  padding: 18px 18px 8px;
  position: sticky;
  top: 18px;
}
.calc-inputs h2 { margin-top: 0; font-size: 1.05rem; color: var(--navy); }

.field { margin: 0 0 12px; }
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
}
.field label .desc {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.78rem;
  margin-left: 6px;
}
.field .row {
  display: flex;
  gap: 6px;
}
.field input[type=number],
.field input[type=text] {
  flex: 1 1 auto;
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--navy-line);
  font: inherit;
  font-size: 0.95rem;
  padding: 6px 10px;
  border-radius: var(--radius);
  color: var(--navy);
}
.field input[type=number]:focus,
.field input[type=text]:focus,
.field select:focus {
  outline: 2px solid var(--orange);
}
.field select {
  flex: 0 0 auto;
  background: #fff;
  border: 1px solid var(--navy-line);
  font: inherit;
  font-size: 0.85rem;
  padding: 5px 6px;
  border-radius: var(--radius);
  color: var(--navy);
  max-width: 130px;
}
.field select.full {
  flex: 1 1 auto;
  width: 100%;
  max-width: none;
}

.field.warning input[type=number] { background: #fff0f0; border-color: var(--red); }

.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
button.btn, a.btn {
  font: inherit;
  font-family: var(--head-font);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 12px;
  border: 1px solid var(--navy-line);
  background: #fff;
  color: var(--navy);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
}
button.btn:hover, a.btn:hover { background: var(--bg-soft); }
button.btn.primary, a.btn.primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}
button.btn.primary:hover, a.btn.primary:hover { background: var(--orange-dark); border-color: var(--orange-dark); }

/* ---- Results ---- */
.results {
  background: var(--bg-result);
  border: 1px solid #f1c97f;
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 8px 0 22px;
}
.results h3 { margin: 0 0 8px; color: var(--orange-dark); font-size: 1rem; }
.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 0;
  border-bottom: 1px dashed #e6d4a8;
}
.result-row:last-child { border-bottom: 0; }
.result-row .label { color: var(--navy-soft); font-size: 0.9rem; }
.result-row .val {
  font-family: var(--head-font);
  font-weight: 700;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
  font-size: 1.1rem;
}
.result-row .val .unit {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.85rem;
  margin-left: 4px;
}
.result-note { color: var(--muted); font-size: 0.85rem; margin-top: 6px; }
.result-note.warn { color: var(--red); }

/* ---- Content body ---- */
.calc-body { min-width: 0; }
.calc-body h1 small {
  display: block;
  font-family: var(--body-font);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 400;
  margin-top: 4px;
}

.section { margin-bottom: 28px; }
.equation {
  background: var(--bg-soft);
  border: 1px solid var(--navy-line);
  border-radius: var(--radius);
  padding: 12px 18px;
  margin: 10px 0;
  font-family: 'KaTeX_Math', 'Times New Roman', serif;
  font-size: 1.05rem;
  overflow-x: auto;
}
.equation .caption {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-family: var(--body-font);
  font-size: 0.85rem;
  font-style: italic;
}

.var-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 14px;
  font-size: 0.95rem;
  padding: 8px 12px;
  background: var(--bg-soft);
  border-radius: var(--radius);
}
.var-list dt { font-weight: 600; color: var(--navy); }
.var-list dd { margin: 0; color: var(--navy-soft); }

.example {
  background: #f0f6ff;
  border-left: 3px solid var(--navy-soft);
  padding: 10px 14px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 12px 0;
}
.example h4 { margin: 0 0 6px; color: var(--navy); font-size: 1rem; }
.example .try-it { margin-top: 8px; }

.refs ol { padding-left: 22px; }
.refs li { margin-bottom: 4px; }

/* ---- Home / cards ---- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-soft) 100%);
  color: #fff;
  padding: 40px 28px 50px;
  border-radius: var(--radius);
  margin-bottom: 28px;
}
.hero h1 { color: #fff; font-size: 2.2rem; margin-bottom: 10px; }
.hero p { color: rgba(255,255,255,0.85); max-width: 720px; font-size: 1.05rem; }
.hero .accent { color: var(--orange); }

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.calc-card {
  background: #fff;
  border: 1px solid var(--navy-line);
  border-radius: var(--radius);
  padding: 16px 18px;
  text-decoration: none;
  color: var(--navy);
  display: block;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.calc-card:hover {
  border-color: var(--orange);
  box-shadow: 0 4px 12px rgba(26,46,70,0.08);
  text-decoration: none;
}
.calc-card h3 { margin: 0 0 6px; font-size: 1.05rem; color: var(--navy); }
.calc-card .topic {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--orange-dark);
  background: var(--bg-result);
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.calc-card p { color: var(--muted); font-size: 0.9rem; margin: 0; }

.topic-group { margin-bottom: 28px; }
.topic-group h2 { color: var(--navy); border-bottom: 2px solid var(--orange); padding-bottom: 4px; }

/* ---- Footer ---- */
footer.site-footer {
  border-top: 1px solid var(--navy-line);
  background: var(--bg-soft);
  padding: 20px 24px;
  color: var(--muted);
  font-size: 0.85rem;
}
footer.site-footer .wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
footer.site-footer a { color: var(--navy-soft); }

/* ---- Chart container ---- */
.chart-wrap {
  background: #fff;
  border: 1px solid var(--navy-line);
  border-radius: var(--radius);
  padding: 12px;
  margin: 10px 0;
}
.chart-wrap canvas { max-width: 100%; height: 360px !important; }

/* ---- Table ---- */
table.data {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.92rem;
}
table.data th, table.data td {
  border: 1px solid var(--navy-line);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}
table.data th {
  background: var(--bg-soft);
  font-family: var(--head-font);
  font-weight: 600;
  color: var(--navy);
}
table.data td.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Quick-jump help */
kbd {
  background: var(--bg-soft);
  border: 1px solid var(--navy-line);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 0.82em;
  font-family: 'Menlo','Consolas',monospace;
  color: var(--navy);
}