/* Heartwood: heartwood.forgesworn.dev
   Hardware datasheet meets field guide. Warm near-black wood, one amber accent
   (heartwood itself), the boot cat as the brand mark. No JavaScript anywhere on
   this site; everything below is CSS-only. */

/* ---------- fonts (served from this domain, nothing third-party) ---------- */

@font-face {
  font-family: "Fraunces";
  src: url("/fonts/fraunces-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-stretch: normal;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fraunces";
  src: url("/fonts/fraunces-italic-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/jetbrains-mono-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

/* ---------- tokens ---------- */

:root {
  --bg: #0b0806;
  --panel: #120d08;
  --card: #171009;
  --line: #2e2314;
  --line-soft: #221a0e;

  --ink: #ece4d3;
  --ink-dim: #b3a488;
  --ink-mute: #7d6f56;

  --heart: #e8a838;
  --heart-dim: #a8862e;
  --bark-c: #7fce7f;
  --sap: #a68ad4;
  --cambium-c: #bcd781;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 66ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

/* ---------- base ---------- */

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: 1.0625rem;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
}

/* faint growth rings, atmosphere only */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-radial-gradient(circle at -8% 110%,
      transparent 0 64px,
      rgba(232, 168, 56, 0.014) 64px 65px),
    repeating-linear-gradient(0deg,
      transparent 0 3px,
      rgba(236, 228, 211, 0.007) 3px 4px);
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

::selection { background: var(--heart); color: #171007; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--heart-dim);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 120ms ease, text-decoration-color 120ms ease;
}
a:hover { color: var(--heart); text-decoration-color: var(--heart); }

:focus-visible {
  outline: 2px solid var(--heart);
  outline-offset: 3px;
  border-radius: 2px;
}

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}

.mono { font-family: var(--mono); font-size: 0.85em; letter-spacing: 0.12em; }

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem var(--gutter);
  border-bottom: 1px solid var(--line-soft);
}

.wordmark {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.42em;
  text-decoration: none;
  color: var(--ink);
}
.wordmark::before {
  content: "◉ ";
  color: var(--heart);
  letter-spacing: 0;
}
.wordmark:hover { color: var(--heart); }

.mastnav {
  display: flex;
  gap: clamp(0.9rem, 2.5vw, 1.8rem);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}
.mastnav a { text-decoration: none; color: var(--ink-dim); }
.mastnav a:hover { color: var(--heart); }
.mastnav .ext::after { content: " ↗"; color: var(--ink-mute); }

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(4rem, 10vh, 7.5rem) var(--gutter) clamp(3rem, 8vh, 6rem);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--heart);
  margin-bottom: 1.4rem;
}

.hero h1 {
  font-weight: 480;
  font-variation-settings: "opsz" 144;
  font-size: clamp(2.9rem, 6.4vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin-bottom: 1.6rem;
  text-wrap: balance;
}
.hero h1 em {
  font-style: italic;
  font-weight: 430;
  color: var(--heart);
}

.lede {
  max-width: 54ch;
  color: var(--ink-dim);
  margin-bottom: 2.2rem;
}
.lede em, .lede strong { color: var(--ink); }

.cta-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 1.6rem; }

.btn {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.btn-primary {
  background: var(--heart);
  color: #1a1206;
  font-weight: 600;
}
.btn-primary:hover { background: #f2bd5c; color: #1a1206; }
.btn-ghost {
  border-color: var(--line);
  color: var(--ink-dim);
}
.btn-ghost:hover { border-color: var(--heart-dim); color: var(--heart); }

.hero-meta {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

/* ---------- plates (figures) ---------- */

.plate {
  background:
    radial-gradient(circle at 50% 46%, rgba(232, 168, 56, 0.05), transparent 62%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: clamp(1rem, 2.5vw, 1.8rem) clamp(1rem, 2.5vw, 1.8rem) 1rem;
}
.plate svg { display: block; width: 100%; height: auto; }
.plate.wide { margin-top: 0.5rem; }

.plate figcaption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-mute);
  border-top: 1px solid var(--line-soft);
  margin-top: 0.9rem;
  padding-top: 0.8rem;
}
.fig-no {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--heart);
}

/* the OLED screen: the boot GIF behind glass, scaled with hard pixels */
.oled {
  background: #060402;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: inset 0 0 44px rgba(232, 168, 56, 0.06);
  padding: clamp(0.8rem, 2vw, 1.4rem);
}
.oled img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

/* ---------- fig. 2 diagram ---------- */

.dg .node {
  fill: var(--card);
  stroke: var(--line);
  stroke-width: 1.25;
}
.dg .heart-node {
  fill: #1d1305;
  stroke: var(--heart-dim);
  stroke-width: 1.5;
}
.dg .nlbl {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  fill: var(--ink-dim);
}
.dg .heart-lbl { fill: var(--heart); }
.dg .nsub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13.5px;
  fill: var(--ink-mute);
}
.dg .heart-sub { fill: var(--heart-dim); }
.dg .wire {
  stroke: var(--heart-dim);
  stroke-width: 1.5;
  fill: none;
  marker-end: none;
}
.dg .wire.back { stroke: #4a3a1c; stroke-dasharray: 5 5; }
.dg .wlbl {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  fill: var(--ink-mute);
}

/* ---------- entrance motion (CSS only) ---------- */

@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

.reveal { animation: rise 0.7s cubic-bezier(0.2, 0.6, 0.2, 1) both; }
.r1 { animation-delay: 0.05s; }
.r2 { animation-delay: 0.14s; }
.r3 { animation-delay: 0.24s; }
.r4 { animation-delay: 0.34s; }
.r5 { animation-delay: 0.44s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { animation: none; }
}

/* ---------- sections ---------- */

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(3.5rem, 9vh, 6.5rem) var(--gutter) 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
  margin-bottom: clamp(1.6rem, 4vh, 2.6rem);
}
.section-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--heart);
}
.section-head h2 {
  font-weight: 470;
  font-variation-settings: "opsz" 60;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  letter-spacing: -0.01em;
}

.section-body p { max-width: var(--measure); color: var(--ink-dim); }
.section-body p + p, .two-col p + p { margin-top: 1rem; }
.section-body p a, .two-col p a, .aside a { color: var(--ink); }
.section-body strong { color: var(--ink); font-weight: 600; }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}
.two-col p { color: var(--ink-dim); }
.two-col p + p { margin-top: 0; }

/* ---------- spec rows ---------- */

.spec-rows { display: block; margin-top: 1.6rem; }
.spec-row {
  display: grid;
  grid-template-columns: 15rem 1fr;
  gap: 1rem 2.5rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line-soft);
}
.spec-row:last-child { border-bottom: 1px solid var(--line-soft); }
.spec-row dt {
  font-style: italic;
  font-weight: 450;
  font-size: 1.18rem;
  color: var(--heart);
}
.spec-row dd { color: var(--ink-dim); max-width: var(--measure); }
.spec-row dd a { color: var(--ink); }

/* ---------- steps ---------- */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.2rem, 3vw, 2rem);
}
.steps li { border-top: 2px solid var(--line); padding-top: 1rem; }
.step-no {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--heart);
  margin-bottom: 0.5rem;
}
.steps p { font-size: 0.97rem; color: var(--ink-dim); }
.steps p a, .steps p em { color: var(--ink); }

.aside {
  font-style: italic;
  color: var(--ink-mute);
  max-width: var(--measure);
  margin-top: 2rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--heart-dim);
}

/* ---------- code block ---------- */

.code {
  font-family: var(--mono);
  font-size: clamp(0.72rem, 1.9vw, 0.92rem);
  line-height: 1.8;
  color: var(--heart);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin: 1.8rem 0 1.2rem;
  overflow-x: auto;
  max-width: 100%;
}
.code code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* ---------- the tree (family) ---------- */

.family-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.family-card {
  display: block;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem 1.4rem 1.6rem;
  transition: border-color 150ms ease;
}
a.family-card:hover { border-color: var(--heart-dim); }
a.family-card:hover h3 { color: var(--heart); }
.family-card.current { border-style: dashed; border-color: var(--heart-dim); }
.family-ring {
  display: inline-block;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  margin-bottom: 0.9rem;
}
.heart-swatch { border: 3px solid var(--heart); }
.sap-swatch { border: 3px solid var(--sap); }
.cambium-swatch { border: 3px solid var(--cambium-c); }
.bark-swatch { border: 3px solid var(--bark-c); }
.family-card h3 {
  font-weight: 500;
  font-size: 1.15rem;
  margin-bottom: 0.45rem;
  color: var(--ink);
  transition: color 150ms ease;
}
.family-card p { font-size: 0.93rem; color: var(--ink-dim); }

/* ---------- colophon ---------- */

.colophon {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(3.5rem, 9vh, 6rem) var(--gutter) 3rem;
}
.colophon-links {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
  margin-bottom: 0.8rem;
}
.colophon-links a { color: var(--ink-dim); text-decoration: none; }
.colophon-links a:hover { color: var(--heart); }
.colophon-note {
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-mute);
  max-width: var(--measure);
}

/* ---------- responsive ---------- */

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .plate { max-width: 620px; }
  .steps { grid-template-columns: 1fr; }
  .family-row { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .two-col p + p { margin-top: 1rem; }
}

@media (max-width: 640px) {
  .masthead { flex-direction: column; gap: 0.8rem; align-items: flex-start; }
  .mastnav { flex-wrap: wrap; }
  .spec-row { grid-template-columns: 1fr; gap: 0.35rem; }
  .family-row { grid-template-columns: 1fr; }
  /* Fig. 2's 880-unit viewBox renders small on a phone; larger SVG text keeps
     the annotations legible at that scale. */
  .dg .nlbl { font-size: 19px; }
  .dg .nsub { font-size: 19px; }
  .dg .wlbl { font-size: 17px; }
}