@font-face {
  font-family: "Geist";
  src: local("Geist"), local("Inter");
  font-weight: 100 900;
}

:root {
  color-scheme: dark light;
  --ink: #0b0d10;
  --graphite: #14171c;
  --slate: #1d2127;
  --panel: #232831;
  --concrete: #2a2f36;
  --paper: #f5f6f7;
  --cloud: #e5e7eb;
  --accent: #2663eb;
  --bg: var(--ink);
  --bg-soft: var(--graphite);
  --surface: var(--slate);
  --surface-elevated: var(--panel);
  --text: var(--paper);
  --text-muted: #d0d5dd;
  --text-subtle: #a4acb8;
  --border: #e5e7eb1f;
  --border-strong: #e5e7eb38;
  --grid: #ffffff12;
  --shadow: 0 1px 0 #ffffff08 inset;
  --max: 72rem;
}

html[data-theme="light"] {
  --bg: #fafaf8;
  --bg-soft: #f3f3ef;
  --surface: #ffffff;
  --surface-elevated: #f1f2f0;
  --text: #0b0d10;
  --text-muted: #374151;
  --text-subtle: #555f57;
  --border: #0b0d101f;
  --border-strong: #0b0d1038;
  --grid: #0b0d1010;
  --shadow: 0 1px 0 #0b0d1008 inset;
}

* { box-sizing: border-box; border-radius: 0 !important; }
html, body { min-height: 100%; margin: 0; }
body {
  font-family: Geist, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(to bottom right, var(--bg), var(--bg-soft));
  color: var(--text-muted);
  transition: background-color .2s, color .2s;
}

a { color: inherit; }

.grid-pattern {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, var(--grid) 1px, transparent 1px), linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse at center, transparent 0%, transparent 35%, rgba(0,0,0,.5) 70%, black 100%);
  -webkit-mask-image: radial-gradient(ellipse at center, transparent 0%, transparent 35%, rgba(0,0,0,.5) 70%, black 100%);
}

.shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

.wrap { width: 100%; max-width: var(--max); animation: fade-in-up .4s ease-out; }
main { max-width: 46rem; margin: 0 auto; padding: 1rem .75rem 3rem; }

.topbar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 2rem; }
.back-link, .theme-button {
  color: var(--text-subtle);
  font-size: .875rem;
  font-weight: 500;
  text-decoration: none;
  border: 0;
  background: transparent;
  padding: .25rem 0;
  cursor: pointer;
}
.back-link:hover, .theme-button:hover { color: var(--text); }

.logo {
  width: 4.8rem;
  height: 4.8rem;
  display: grid;
  place-items: center;
  color: var(--text);
  border: 1px solid var(--border-strong);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
  box-shadow: var(--shadow);
  font-weight: 800;
  letter-spacing: -.08em;
  font-size: 2rem;
}

h1, h2, h3 { color: var(--text); margin: 0; line-height: 1.1; letter-spacing: -.04em; }
h1 { font-size: clamp(2.5rem, 8vw, 4.8rem); font-weight: 800; }
h2 { font-size: 1.35rem; font-weight: 650; margin-top: 2.5rem; margin-bottom: .75rem; }
h3 { font-size: 1rem; font-weight: 650; letter-spacing: -.02em; }
p { line-height: 1.65; }
.lede { margin: .75rem 0 2rem; font-size: 1rem; color: var(--text-muted); }
.brand-link, .inline-link {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  transition: color .16s, border-color .16s;
}
.brand-link:hover, .inline-link:hover { color: var(--accent); border-bottom-color: var(--accent); }

.kicker { color: var(--text-subtle); font-size: .875rem; text-transform: uppercase; letter-spacing: .14em; margin-bottom: .75rem; }
.card-list { display: grid; gap: .75rem; }
.resource-card {
  display: block;
  padding: 1rem;
  text-align: left;
  text-decoration: none;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  transition: all .16s ease;
}
.resource-card:hover, .resource-card:focus-visible {
  background: var(--surface-elevated);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
  outline: none;
}
.resource-title { display: block; color: var(--text); font-weight: 650; }
.resource-subtitle { display: block; color: var(--text-subtle); font-size: .92rem; line-height: 1.5; margin-top: .25rem; }

.socials { display: flex; justify-content: center; gap: 1.2rem; flex-wrap: wrap; padding-top: 2.5rem; }
.socials a { color: var(--text-subtle); text-decoration: none; font-weight: 600; transition: color .16s, transform .16s; }
.socials a:hover { color: var(--text); transform: scale(1.06); }

.sheet {
  background: linear-gradient(to bottom right, color-mix(in srgb, var(--surface) 82%, var(--bg)), color-mix(in srgb, var(--surface-elevated) 70%, var(--surface)));
  border: 1px solid var(--border);
  box-shadow: var(--shadow), 0 24px 90px #00000024;
  padding: clamp(1.25rem, 3vw, 2.5rem);
}
.grid { display: grid; gap: 1rem; }
@media (min-width: 760px) { .grid.two { grid-template-columns: 1fr 1fr; } }
.project { border-left: 1px solid var(--border-strong); padding-left: 1rem; }
.project p { margin: .35rem 0 0; color: var(--text-subtle); font-size: .92rem; }
.project a { color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border-strong); }
.project a:hover { color: var(--accent); border-color: var(--accent); }
.note { color: var(--text-subtle); font-size: .9rem; }

@keyframes fade-in-up { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .wrap { animation: none; } .resource-card, .socials a { transition: none; } }

/* Long-form field notes: narrow reading measure inside the site's industrial shell. */
.article { max-width: 54rem; }
.article-header { margin-bottom: 2rem; }
.article h1 { max-width: 12ch; font-size: clamp(3rem, 9vw, 6.4rem); }
.article .lede { max-width: 42rem; font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.55; }
.article-meta { display: flex; flex-wrap: wrap; gap: .55rem 1rem; color: var(--text-subtle); font-size: .84rem; }
.article-body { max-width: 44rem; }
.article-body h2 { margin-top: 3.4rem; font-size: clamp(1.6rem, 4vw, 2.35rem); }
.article-body h3 { margin-top: 2rem; font-size: 1.15rem; }
.article-body p, .article-body li { font-size: 1.02rem; line-height: 1.78; }
.article-body ul, .article-body ol { padding-left: 1.25rem; }
.article-body li + li { margin-top: .55rem; }
.article-body a { color: var(--text); text-underline-offset: .2em; text-decoration-color: var(--border-strong); }
.article-body a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); margin: 2.2rem 0; border: 1px solid var(--border-strong); }
.metric-strip > div { padding: 1rem; min-height: 7.5rem; background: color-mix(in srgb, var(--surface) 68%, transparent); }
.metric-strip > div + div { border-left: 1px solid var(--border-strong); }
.metric-value { display: block; color: var(--text); font-size: clamp(2rem, 7vw, 3.5rem); font-weight: 800; letter-spacing: -.06em; }
.metric-label { display: block; margin-top: .4rem; color: var(--text-subtle); font-size: .8rem; line-height: 1.35; text-transform: uppercase; letter-spacing: .08em; }
.method-map { margin: 2rem 0; border-left: 3px solid var(--accent); padding: .25rem 0 .25rem 1.25rem; }
.method-map strong { color: var(--text); }
.callout { margin: 2rem 0; padding: 1.25rem; border: 1px solid var(--border-strong); background: var(--surface-elevated); }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.sources { font-size: .9rem; color: var(--text-subtle); }
.sources li { font-size: .9rem; }
.article-footer { margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border); color: var(--text-subtle); }
@media (max-width: 640px) {
  .metric-strip { grid-template-columns: 1fr; }
  .metric-strip > div { min-height: 0; }
  .metric-strip > div + div { border-left: 0; border-top: 1px solid var(--border-strong); }
}