:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #eef0ea;
  --text: #1d2420;
  --muted: #5d6862;
  --border: #d9ddd5;
  --grid: #e4e7e0;
  --brand: #1f4d3a;
  --accent: #c2410c;
  --accent-2: #2563a6;
  --flag: #b91c1c;
  --pass: #15803d;
  --c-low: #3b82f6;
  --c-mod: #22a35a;
  --c-high: #e0b100;
  --c-vhigh: #ea7a12;
  --c-ext: #d02a2a;
  --radius: 12px;
  --max: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121614;
    --surface: #1a201d;
    --surface-2: #222a26;
    --text: #e7ebe8;
    --muted: #9aa69f;
    --border: #2f3934;
    --grid: #29322d;
    --brand: #7fc4a2;
    --accent: #f97c3c;
    --accent-2: #6aa8ec;
    --flag: #f87171;
    --pass: #4ade80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); }
a:hover { color: var(--accent); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -.01em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; font-weight: 700; color: var(--accent); margin-bottom: .6em; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.logo { font-weight: 800; text-decoration: none; color: var(--text); white-space: nowrap; }
.logo span { color: var(--accent); }
.nav { display: flex; gap: 20px; overflow-x: auto; }
.nav a { color: var(--muted); text-decoration: none; font-size: .92rem; font-weight: 600; white-space: nowrap; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero { padding: 72px 0 56px; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); letter-spacing: -.02em; max-width: 18ch; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero .lede { font-size: 1.15rem; color: var(--muted); max-width: 62ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; font-weight: 700; font-size: .95rem;
  text-decoration: none; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer;
}
.btn.primary { background: var(--brand); color: var(--bg); border-color: var(--brand); }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 44px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat b { display: block; font-size: 1.7rem; color: var(--brand); }
.stat span { font-size: .88rem; color: var(--muted); }

section { padding: 64px 0; }
section.alt { background: var(--surface-2); }
.section-intro { max-width: 70ch; color: var(--muted); margin-bottom: 32px; }

/* Bridge: how experience maps to fire science */
.map-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.map-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.map-card h3 { display: flex; gap: 10px; align-items: baseline; }
.map-card h3 .n { color: var(--accent); font-size: .9rem; }
.map-card p { margin: 0; color: var(--muted); font-size: .95rem; }
.map-card .from { font-size: .82rem; color: var(--brand); font-weight: 700; margin-top: 10px; display: block; }

/* Projects */
.projects { display: grid; gap: 20px; }
.project {
  display: grid; grid-template-columns: 1fr 1.5fr; gap: 28px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px;
}
.project .tag { display: inline-block; font-size: .78rem; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
.project h3 { font-size: 1.3rem; }
.project dl { margin: 0; display: grid; gap: 12px; }
.project dt { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; }
.project dd { margin: 2px 0 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; padding: 0; list-style: none; }
.chips li { font-size: .8rem; padding: 3px 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); }
.fire-link { margin-top: 14px; padding: 12px 14px; border-left: 3px solid var(--accent); background: var(--surface-2); border-radius: 0 8px 8px 0; font-size: .93rem; }
.fire-link b { color: var(--accent); }
.note { font-size: .88rem; color: var(--muted); margin-top: 20px; }

.shot { grid-column: 1 / -1; margin: 0; }
.shot img { width: 100%; height: auto; display: block; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.shot figcaption { font-size: .85rem; color: var(--muted); margin-top: 8px; }

/* Diagram */
.layers { display: grid; gap: 8px; margin-top: 4px; }
.layer { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; background: var(--surface-2); }
.layer b { display: block; font-size: .92rem; }
.layer span { font-size: .84rem; color: var(--muted); }
.layer.l1 { border-left: 4px solid var(--accent); }
.layer.l2 { border-left: 4px solid var(--c-high); }
.layer.l3 { border-left: 4px solid var(--brand); }

/* Demos */
.demo { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.demo-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.demo-head p { margin: 0; color: var(--muted); max-width: 70ch; }
.calc { display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; }
.fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin: 0 0 12px; }
legend { font-size: .8rem; font-weight: 700; color: var(--muted); padding: 0 6px; }
label { display: grid; gap: 4px; font-size: .84rem; font-weight: 600; }
input, select {
  font: inherit; font-size: .95rem; padding: 7px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text); width: 100%;
}
input:focus, select:focus, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
#fwi-out { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; align-content: start; }
.code { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
.code span { display: block; font-size: .75rem; font-weight: 700; color: var(--muted); letter-spacing: .06em; }
.code b { font-size: 1.4rem; font-variant-numeric: tabular-nums; }
.code-main { border-color: var(--accent); }
.code-main b { color: var(--accent); }
.class-pill {
  grid-column: 1 / -1; text-align: center; font-weight: 800; padding: 8px; border-radius: 8px;
  background: color-mix(in srgb, var(--pill) 18%, transparent); border: 1px solid var(--pill);
}
.controls { display: flex; gap: 16px; align-items: end; flex-wrap: wrap; }
.controls label { min-width: 200px; }
input[type=range] { padding: 0; accent-color: var(--accent); }
.chart-box { position: relative; }
canvas { width: 100%; display: block; }
#season-chart { height: 280px; touch-action: none; }
#qc-temp, #qc-rh { height: 190px; }
.tip { font-size: .85rem; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; margin-top: 8px; font-variant-numeric: tabular-nums; }
.tip[hidden] { display: block; visibility: hidden; }
.class-counts { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: .88rem; }
.class-counts i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; }
.class-counts b { margin-left: 6px; font-variant-numeric: tabular-nums; }
#season-summary p { margin: 12px 0 0; }
.qc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.chart-title { font-size: .85rem; font-weight: 700; color: var(--muted); margin: 0 0 4px; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.status { font-size: .78rem; font-weight: 800; padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.status.pass { color: var(--pass); background: color-mix(in srgb, var(--pass) 14%, transparent); }
.status.fail { color: var(--flag); background: color-mix(in srgb, var(--flag) 14%, transparent); }
#qc-score { margin: 12px 0 0; font-size: .95rem; }
.legend-flag { display: inline-flex; align-items: center; gap: 6px; font-size: .85rem; color: var(--muted); }
.legend-flag i { width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--flag); }
details { margin-top: 16px; font-size: .92rem; }
summary { cursor: pointer; font-weight: 700; color: var(--brand); }

/* Experience */
.timeline { display: grid; gap: 14px; }
.job { display: grid; grid-template-columns: 200px 1fr; gap: 20px; padding: 18px 0; border-top: 1px solid var(--border); }
.job .when { color: var(--muted); font-size: .9rem; font-weight: 600; }
.job h3 { margin-bottom: .2em; }
.job p { margin: 0; color: var(--muted); }
.skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 32px; }
.skill { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.skill h3 { font-size: 1rem; }
.skill ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: .92rem; }

/* Contact */
.contact { text-align: center; }
.contact p { max-width: 60ch; margin: 0 auto 1em; color: var(--muted); }
.contact .cta { justify-content: center; }
footer { padding: 28px 0; border-top: 1px solid var(--border); font-size: .85rem; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .project, .calc, .qc-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .job { grid-template-columns: 1fr; gap: 4px; }
  .nav { display: none; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .project, .demo { padding: 18px; }
  #fwi-out { grid-template-columns: repeat(2, 1fr); }
}