/* Fieldreason — design system v2: "field manual meets control room".
   Paper document surface, near-black ink, steel grey secondary, ONE signal colour (safety orange),
   mono for every label / reference / number, schematic linework as the only decoration. */
:root {
  color-scheme: light;
  --paper: #f3f1ec;        /* document paper */
  --paper-2: #eae7df;      /* secondary surface */
  --card: #fbfaf7;
  --ink: #15171b;          /* near-black */
  --ink-2: #2a2e35;
  --ink-inverse: #f3f1ec;
  --steel: #66707a;        /* secondary text */
  --steel-2: #8b949c;      /* muted labels */
  --line: #d6d5cf;
  --line-strong: #b9b8b1;
  --signal: #f04e23;       /* safety orange — CTA, markers, the one accent */
  --signal-fg: #fff7f3;
  --signal-soft: #fde6dd;
  --ok: #2f7a4d;           /* only for "live" / confirmations */
  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-sans: "Geist", "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 3px;
  --max: 1160px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; display: block; }
.wrap { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.02em; line-height: 1.02; }
h1 { font-size: clamp(2.6rem, 6.2vw, 5rem); font-stretch: 105%; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.7rem); }
h3 { font-size: 1.2rem; line-height: 1.25; letter-spacing: -0.01em; }
p { color: var(--ink-2); }
.mono { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.02em; }
.eyebrow { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--steel); margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ""; width: 10px; height: 10px; background: var(--signal); display: inline-block; }

/* schematic grid, used behind the hero and dark sections */
.grid-bg { background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 48px 48px; background-position: center top; }
.hero.grid-bg { background-image: linear-gradient(to bottom, rgba(243,241,236,0) 0%, var(--paper) 100%), linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(243, 241, 236, 0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.brand svg { width: 26px; height: 26px; }
.links { display: flex; gap: 28px; font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--steel); }
.links a:hover, .links a[aria-current] { color: var(--ink); }
.links a[aria-current] { box-shadow: inset 0 -2px 0 var(--signal); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 18px; border-radius: var(--radius); font-family: var(--font-mono); font-weight: 500; font-size: 0.82rem; letter-spacing: 0.04em; text-transform: uppercase; border: 1px solid transparent; transition: background 0.15s, color 0.15s, border-color 0.15s; }
.btn-primary { background: var(--signal); color: var(--signal-fg); }
.btn-primary:hover { background: #d43f18; }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); }
.btn-ink { background: var(--ink); color: var(--ink-inverse); }
.btn-ink:hover { background: var(--ink-2); }
.nav-cta { display: flex; gap: 10px; }

/* hero */
.hero { padding: 96px 0 80px; border-bottom: 1px solid var(--line); }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }
.hero h1 em { font-style: normal; color: var(--signal); }
.hero .lede { margin: 28px 0 34px; font-size: clamp(1.08rem, 1.5vw, 1.25rem); max-width: 560px; color: var(--ink-2); }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* system card = control-room panel (dark) */
.system { background: var(--ink); color: var(--ink-inverse); border: 1px solid #2c3037; border-radius: 4px; box-shadow: 0 30px 70px rgba(21, 23, 27, 0.18); overflow: hidden; font-size: 0.92rem; }
.system-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid #2c3037; }
.system-head .mono { color: var(--steel-2); }
.live { display: inline-flex; align-items: center; gap: 7px; color: #9fd8b2; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; }
.live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #58c47e; box-shadow: 0 0 0 3px rgba(88,196,126,0.2); }
.event { padding: 14px 16px; border-bottom: 1px solid #2c3037; color: #e6e3dc; }
.event .mono { color: var(--signal); display: block; margin-bottom: 4px; }
.event strong { font-weight: 600; color: #fff; }
.steps { padding: 4px 16px 10px; }
.step { display: grid; grid-template-columns: 26px 1fr; gap: 12px; padding: 11px 0; border-bottom: 1px dashed #2c3037; }
.step:last-child { border-bottom: 0; }
.step .dot { width: 26px; height: 20px; border-radius: 2px; display: grid; place-items: center; font-family: var(--font-mono); font-size: 0.66rem; color: var(--ink); background: #cfd3d8; margin-top: 2px; }
.step .dot.calm { background: #9fd8b2; }
.step .dot.action { background: var(--signal); color: var(--signal-fg); }
.step b { display: block; font-weight: 600; font-size: 0.9rem; color: #fff; font-family: var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase; font-size: 0.72rem; margin-bottom: 2px; }
.step span { color: #b9bdc4; font-size: 0.88rem; }
.system-foot { display: flex; justify-content: space-between; align-items: center; padding: 11px 16px; border-top: 1px solid #2c3037; font-size: 0.8rem; color: var(--steel-2); font-family: var(--font-mono); }
.pill { display: inline-block; padding: 3px 8px; border-radius: 2px; font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; }
.pill-calm { background: rgba(88,196,126,0.15); color: #9fd8b2; border: 1px solid rgba(88,196,126,0.35); }
.pill-kraft { background: var(--paper-2); color: var(--ink-2); }

/* sections */
section { padding: 80px 0; }
.band { background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dark { background: var(--ink); color: var(--ink-inverse); }
.dark p, .dark .eyebrow { color: #b9bdc4; }
.dark h2 { color: var(--ink-inverse); }
.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head p { margin-top: 16px; font-size: 1.05rem; color: var(--steel); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card { background: var(--card); padding: 28px; }
.grid-2 .card { border: 1px solid var(--line); }
.card h3 { margin: 16px 0 10px; }
.card p { font-size: 0.97rem; color: var(--steel); }
.card .num { font-family: var(--font-mono); font-size: 0.72rem; color: var(--signal); letter-spacing: 0.1em; text-transform: uppercase; }
.tile { background: var(--card); padding: 22px 14px; text-align: center; }
.tile .glyph { font-family: var(--font-mono); font-size: 0.66rem; color: var(--steel-2); letter-spacing: 0.12em; text-transform: uppercase; }
.tile strong { display: block; margin-top: 8px; font-weight: 600; font-size: 1rem; font-family: var(--font-display); }
.quote { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.4rem, 2.5vw, 2rem); line-height: 1.22; max-width: 920px; color: var(--ink); letter-spacing: -0.015em; }
.dark .quote { color: var(--ink-inverse); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.stat { border-top: 2px solid var(--signal); padding-top: 14px; }
.stat b { display: block; font-family: var(--font-mono); font-weight: 500; font-size: 2rem; line-height: 1; margin-bottom: 8px; letter-spacing: -0.02em; }
.stat span { color: #b9bdc4; font-size: 0.9rem; }

/* tables */
table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); font-size: 0.95rem; }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--steel); background: var(--paper-2); font-weight: 500; }
tr:last-child td { border-bottom: 0; }
td:first-child { font-weight: 600; font-family: var(--font-display); }
.table-wrap { overflow-x: auto; }

/* method timeline */
.timeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); counter-reset: s; }
.timeline .card { position: relative; }
.timeline .card::before { counter-increment: s; content: "0" counter(s); font-family: var(--font-mono); font-size: 0.72rem; color: var(--signal); letter-spacing: 0.1em; }
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 48px; }
.principles li { list-style: none; padding: 20px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 34px 1fr; gap: 12px; counter-increment: pr; }
.principles li::before { content: counter(pr, decimal-leading-zero); font-family: var(--font-mono); font-size: 0.72rem; color: var(--steel-2); padding-top: 6px; }
.principles { counter-reset: pr; }
.principles li strong { display: block; font-family: var(--font-display); font-size: 1.12rem; margin-bottom: 6px; letter-spacing: -0.01em; }
.principles li span { color: var(--steel); font-size: 0.97rem; }

/* cta band */
.cta-band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.cta-band h2 { max-width: 640px; }

/* people */
.person { display: grid; grid-template-columns: 96px 1fr; gap: 22px; align-items: start; }
.avatar { width: 96px; height: 96px; border-radius: 2px; background: var(--ink); border: 1px solid var(--ink); display: grid; place-items: center; font-family: var(--font-mono); font-weight: 500; font-size: 1.4rem; color: var(--ink-inverse); }
.avatar.open { background: transparent; border: 1px dashed var(--line-strong); color: var(--steel-2); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.role { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--signal); margin-bottom: 6px; }

/* prose pages */
.prose { max-width: 760px; }
.wrap.prose { margin-left: max(24px, calc((100% - var(--max)) / 2)); margin-right: auto; }
@media (max-width: 1208px) { .wrap.prose { margin-left: 24px; } }
.prose h2 { font-size: 1.5rem; margin: 44px 0 12px; padding-top: 18px; border-top: 1px solid var(--line); }
.prose p, .prose li { margin-bottom: 12px; font-size: 1.02rem; }
.prose ul { padding-left: 20px; }
.prose ul li { color: var(--ink-2); }

/* footer = document footer */
footer { border-top: 1px solid var(--line); padding: 48px 0 28px; background: var(--paper-2); }
footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
footer p, footer a { color: var(--steel); font-size: 0.92rem; }
footer .col h4 { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--steel-2); margin-bottom: 12px; font-weight: 500; }
footer .col a { display: block; margin-bottom: 8px; }
footer .col a:hover { color: var(--ink); }
.legal-line { margin-top: 36px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--steel-2); }

@media (max-width: 900px) {
  .hero .wrap, .grid-3, .grid-2, .timeline, .principles, footer .wrap { grid-template-columns: 1fr; }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 56px 0 48px; }
  .links { display: none; }
  .cta-band .wrap { flex-direction: column; align-items: flex-start; }
  .person { grid-template-columns: 72px 1fr; }
  .avatar { width: 72px; height: 72px; }
}
@media (max-width: 560px) {
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
  .wrap { width: calc(100% - 32px); }
  section { padding: 56px 0; }
}

/* principles: number in col 1 spanning both rows; title + text in col 2 */
.principles li::before { grid-row: 1 / span 2; grid-column: 1; }
.principles li strong, .principles li span { grid-column: 2; }

/* brand mark (site-marker logo, PNG) */
.brand .brand-mark { width: 28px; height: 28px; border-radius: 4px; display: inline-block; }