/* Cambium — cambium.forgesworn.dev
   Botanical field-guide meets security spec-sheet. Dark bark, one living-green
   accent (the cambium layer itself), amber for heartwood. 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: #0d0a07;
  --panel: #14100a;
  --card: #191309;
  --line: #2c2314;
  --line-soft: #211a0e;

  --ink: #ece5d6;
  --ink-dim: #b3a68c;
  --ink-mute: #7d715a;

  --cambium: #bcd781;
  --cambium-dim: #8ba354;
  --heart: #d39c57;
  --bark: #5b4830;
  --sap: #6f5836;

  --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 wood grain + one ghost ring set, atmosphere only */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-radial-gradient(circle at 110% -12%,
      transparent 0 54px,
      rgba(188, 215, 129, 0.016) 54px 55px),
    repeating-linear-gradient(90deg,
      transparent 0 3px,
      rgba(236, 229, 214, 0.008) 3px 4px);
  z-index: 0;
}

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

::selection { background: var(--cambium); color: #131107; }

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

:focus-visible {
  outline: 2px solid var(--cambium);
  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;
}

/* ---------- 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(--cambium);
  letter-spacing: 0;
}
.wordmark:hover { color: var(--cambium); }

.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(--cambium); }
.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(--cambium);
  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(--cambium);
}

.lede {
  max-width: 54ch;
  color: var(--ink-dim);
  margin-bottom: 2.2rem;
}
.lede em { 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(--cambium);
  color: #16130a;
  font-weight: 600;
}
.btn-primary:hover { background: #cfe69a; color: #16130a; }
.btn-ghost {
  border-color: var(--line);
  color: var(--ink-dim);
}
.btn-ghost:hover { border-color: var(--cambium-dim); color: var(--cambium); }

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

/* ---------- the plate (Fig. 1) ---------- */

.plate {
  background:
    radial-gradient(circle at 50% 46%, rgba(211, 156, 87, 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 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);
}

/* rings */
.ring { fill: none; transform-box: view-box; transform-origin: center; }
.bark { stroke: var(--bark); stroke-width: 7; opacity: 0.9; }
.bark.thin { stroke-width: 1.5; opacity: 0.45; }
.cambium { stroke: var(--cambium); stroke-width: 2.75; }
.cambium-glow { stroke: var(--cambium); stroke-width: 10; opacity: 0.1; }
.sap { stroke: var(--sap); stroke-width: 1.6; opacity: 0.7; }
.sap.faint { stroke-width: 1; opacity: 0.32; }
.heart-fill { fill: #271a0b; transform-box: view-box; transform-origin: center; }
.ring.heart { stroke: var(--heart); stroke-width: 2; opacity: 0.85; }
.heart.thin { stroke-width: 1; opacity: 0.4; }
.heart-core { fill: var(--heart); transform-box: view-box; transform-origin: center; }

/* annotations */
.leader { fill: none; stroke: #45391f; stroke-width: 1; }
.cambium-leader { stroke: #5f6f3b; }
.leader-dot { fill: #93835f; transform-box: view-box; transform-origin: center; }
.cambium-dot { fill: var(--cambium); }
.heart-dot { fill: var(--heart); }
.lbl {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  fill: var(--ink-dim);
}
.cambium-lbl { fill: var(--cambium); }
.heart-lbl { fill: var(--heart); }
.lbl-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15.5px;
  fill: var(--ink-mute);
}

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

@keyframes rise { from { opacity: 0; transform: translateY(14px); } }
@keyframes ringIn { from { opacity: 0; transform: scale(0.965); } }

.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; }

.d1, .d2, .d3, .d4, .d5, .d6, .d7, .d8, .d9, .d10, .d11, .d12, .d13, .d14 {
  animation: ringIn 0.8s ease both;
}
.d1 { animation-delay: 0.25s; }  .d2 { animation-delay: 0.32s; }
.d3 { animation-delay: 0.40s; }  .d4 { animation-delay: 0.47s; }
.d5 { animation-delay: 0.53s; }  .d6 { animation-delay: 0.59s; }
.d7 { animation-delay: 0.65s; }  .d8 { animation-delay: 0.71s; }
.d9 { animation-delay: 0.78s; }  .d10 { animation-delay: 0.85s; }
.d11 { animation-delay: 1.00s; } .d12 { animation-delay: 1.10s; }
.d13 { animation-delay: 1.20s; } .d14 { animation-delay: 1.30s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .d1, .d2, .d3, .d4, .d5, .d6, .d7,
  .d8, .d9, .d10, .d11, .d12, .d13, .d14 { 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); }

.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; }

/* ---------- 02 · spec rows ---------- */

.spec-rows { display: block; }
.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(--cambium);
}
.spec-row dd { color: var(--ink-dim); max-width: var(--measure); }

/* ---------- 03 · features ---------- */

.feature-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  overflow: hidden;
}
.feature-grid li {
  background: var(--panel);
  padding: 1.6rem 1.5rem 1.7rem;
  transition: background 150ms ease;
}
.feature-grid li:hover { background: var(--card); }
.feature-grid h3 {
  font-weight: 500;
  font-size: 1.12rem;
  letter-spacing: -0.005em;
  margin-bottom: 0.55rem;
}
.feature-grid h3::before {
  content: "◍";
  color: var(--cambium-dim);
  font-size: 0.7em;
  margin-right: 0.55em;
}
.feature-grid p { font-size: 0.95rem; color: var(--ink-dim); }
.feature-grid p em { color: var(--ink); }

/* ---------- 04 · steps ---------- */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1.2rem, 3vw, 2rem);
  counter-reset: step;
}
.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(--cambium-dim);
}

/* ---------- 05 · fingerprint ---------- */

.fingerprint {
  font-family: var(--mono);
  font-size: clamp(0.72rem, 1.9vw, 0.92rem);
  line-height: 1.8;
  color: var(--cambium);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin: 1.6rem 0 1.2rem;
  overflow-x: auto;
  max-width: 100%;
}
.fingerprint code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

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

.family-row {
  display: grid;
  grid-template-columns: repeat(3, 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(--cambium-dim); }
a.family-card:hover h3 { color: var(--cambium); }
.family-card.current { border-style: dashed; border-color: var(--cambium-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); }
.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(--cambium); }
.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; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .family-row { grid-template-columns: 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; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .spec-row { grid-template-columns: 1fr; gap: 0.35rem; }
  /* The 800-unit viewBox renders small on a phone; larger SVG text keeps the
     annotations legible at that scale. */
  .lbl { font-size: 21px; letter-spacing: 0.14em; }
  .lbl-sub { font-size: 25px; }
}