/* ---------- Fonts ---------- */
/* not the best import but time is of the essence */
@font-face {
  font-family: "MD Lórien";
  src: url("./fonts/MDLorien-Book.woff2") format("woff2");
  font-weight: 350;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "MD Lórien";
  src: url("./fonts/MDLorien-BookItalic.woff2") format("woff2");
  font-weight: 350;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "MD Lórien";
  src: url("./fonts/MDLorien-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "MD Lórien";
  src: url("./fonts/MDLorien-Italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "MD Lórien";
  src: url("./fonts/MDLorien-Semibold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "MD UI";
  src: url("./fonts/MDUI-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "MD UI";
  src: url("./fonts/MDUI-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --paper: #f1ece1;
  --paper-raised: #e8e1d1;
  --fog: #d4cdb9;
  --hairline: #b9b09a;
  --graphite-600: #3a3833;
  --graphite-900: #1b1a17;
  --ink: #1b1a17;
  --accent: #5a4a2f;
  --accent-soft: #8a7551;

  /* dark surface */
  --night: #16140f;          /* near-black with warmth */
  --night-raised: #1f1c16;
  --night-hairline: #3a342a;
  --night-text: #e9e2d1;     /* warm white */
  --night-muted: #aea493;

  /* paperwhite e-ink */
  --eink: #cfc7b4;           /* greenish-grey LCD tint, peep inspo */
  --eink-deep: #b6ad99;
  --eink-ink: #2a2820;

  --serif: "MD Lórien", "Iowan Old Style", "Charter", Georgia, serif;
  --sans:  "MD UI", -apple-system, BlinkMacSystemFont, "Inter", system-ui, sans-serif;
  --mono:  ui-monospace, "JetBrains Mono", "SFMono-Regular", "Menlo", monospace;

  --measure: 62ch;
  --max-w: none;
  --gutter: 40px;

  --ease-out: cubic-bezier(0.2, 0.7, 0.1, 1);
  --ease-soft: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ---------- Base ---------- */
body {
  font-family: var(--serif);
  font-weight: 350;
  background: var(--paper);
  color: var(--graphite-900);
  font-size: 18px;
  line-height: 1.6;
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.35;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.10  0 0 0 0 0.10  0 0 0 0 0.10  0 0 0 0.18 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 220px 220px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.018em;
  line-height: 1.04;
  margin: 0;
}

.eyebrow {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.label {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite-600);
}
.label.dark-label { color: var(--night-muted); }

.measure { max-width: var(--measure); }

p { margin: 0 0 1.1em; }
p + p { margin-top: 1.1em; }

em { font-style: italic; }

/* ---------- Layout ---------- */
.container {
  max-width: none;
  margin: 0;
  padding: 0 var(--gutter);
  position: relative;
  z-index: 2;
}

section {
  padding: clamp(110px, 16vw, 200px) 0;
  position: relative;
  z-index: 2;
}

/* ---------- Header/Nav ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 22px 0;
  transition: background-color 400ms var(--ease-out), border-color 400ms var(--ease-out), color 400ms var(--ease-out), transform 360ms var(--ease-out);
  border-bottom: 1px solid transparent;
  will-change: transform;
}
.site-header.is-hidden { transform: translateY(-100%); }
.site-header.scrolled {
  background: rgba(241, 236, 225, 0.78);
  backdrop-filter: blur(12px) saturate(115%);
  -webkit-backdrop-filter: blur(12px) saturate(115%);
  border-bottom-color: var(--hairline);
}
.site-header.on-dark {
  background: rgba(22, 20, 15, 0.7);
  backdrop-filter: blur(12px) saturate(110%);
  -webkit-backdrop-filter: blur(12px) saturate(110%);
  border-bottom-color: var(--night-hairline);
  color: var(--night-text);
}
.site-header.on-dark .nav-links a { color: var(--night-muted); }
.site-header.on-dark .nav-links a:hover { color: var(--night-text); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.018em;
  display: inline-block;
  text-transform: lowercase;
}
.nav-links {
  display: flex;
  gap: 36px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.nav-links a {
  position: relative;
  padding: 4px 0;
  color: var(--graphite-600);
  transition: color 250ms var(--ease-out);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px;
  width: 100%;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 280ms var(--ease-out);
}
.nav-links a:hover { color: var(--graphite-900); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-arrow { display: inline-block; transform: translate(2px, -1px); }

@media (max-width: 720px) {
  .nav-links { gap: 18px; }
  .nav-links a:not(.gh) { display: none; }
}

/* ---------- Buttons/CTAs ---------- */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: center;
  margin-top: 48px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.04em;
  border: 1px solid var(--graphite-900);
  color: var(--graphite-900);
  background: transparent;
  transition: background 280ms var(--ease-out), color 280ms var(--ease-out), border-color 280ms var(--ease-out);
}
.btn:hover { background: var(--graphite-900); color: var(--paper); }
.btn-ghost {
  border: 0;
  padding-left: 0;
  position: relative;
}
.btn-ghost::after {
  content: "";
  position: absolute;
  left: 0; bottom: 6px;
  height: 1px;
  width: 100%;
  background: var(--graphite-600);
  transform: scaleX(1);
  transform-origin: left;
  transition: transform 320ms var(--ease-out);
}
.btn-ghost:hover { background: transparent; color: var(--graphite-900); }
.btn-ghost:hover::after { transform: scaleX(0.4); }

.btn-on-dark {
  border-color: var(--night-text);
  color: var(--night-text);
}
.btn-on-dark:hover { background: var(--night-text); color: var(--night); }
.btn-ghost.btn-on-dark { border: 0; }
.btn-ghost.btn-on-dark::after { background: var(--night-muted); }
.btn-ghost.btn-on-dark:hover { background: transparent; color: var(--night-text); }

/* ---------- Hero (dark) ---------- */
.hero {
  min-height: 100vh;
  padding-top: clamp(120px, 16vh, 200px);
  padding-bottom: clamp(80px, 10vw, 140px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--night-text);
}
.hero::before {
  /* warm grain over dark, lifted (matches section.dark) */
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  mix-blend-mode: screen;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.95  0 0 0 0 0.90  0 0 0 0 0.78  0 0 0 0.10 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 220px 220px;
  z-index: 0;
}
.hero canvas#hero-fog {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.32;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 55%, black 30%, transparent 92%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 55%, black 30%, transparent 92%);
}
.hero .container { z-index: 2; position: relative; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.55fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
}
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
}

.hero-eyebrow {
  margin-bottom: clamp(28px, 4vw, 40px);
}
.hero .eyebrow { color: var(--accent-soft); }

.hero-blurb {
  font-family: var(--serif);
  font-size: clamp(28px, 3.6vw, 46px);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.018em;
  color: var(--night-text);
  max-width: 22ch;
  margin: 0;
}
.hero-blurb .it { font-style: italic; font-weight: 400; }
.hero-blurb .muted { color: var(--night-muted); }

.hero .cta-row { margin-top: clamp(32px, 4vw, 48px); }

/* ---------- Kindle frame to host GitHub ---------- */
.kindle {
  width: 100%;
  background: #2a2620;
  border-radius: 14px;
  padding: 16px 16px 26px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.05) inset,
    0 30px 56px -22px rgba(0,0,0,0.55),
    0 12px 24px -16px rgba(0,0,0,0.6);
  position: relative;
}
.kindle::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 8px;
  transform: translateX(-50%);
  width: 30px; height: 4px;
  background: #1b1814;
  border-radius: 2px;
}
.kindle-screen {
  background:
    repeating-linear-gradient(0deg, rgba(43,42,32,0.05) 0 1px, transparent 1px 2px),
    var(--eink);
  color: var(--eink-ink);
  border-radius: 4px;
  padding: clamp(20px, 2.4vw, 32px);
  font-family: var(--sans);
  filter: contrast(0.96);
  min-height: clamp(380px, 44vw, 540px);
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 1.6vw, 20px);
}
.k-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--eink-ink);
  opacity: 0.6;
}
.k-batt {
  display: inline-block;
  width: 22px; height: 9px;
  border: 1px solid var(--eink-ink);
  position: relative;
}
.k-batt::after {
  content: "";
  position: absolute;
  right: -3px; top: 2px;
  width: 2px; height: 5px;
  background: var(--eink-ink);
}
.k-batt-bar { display: block; height: 100%; background: var(--eink-ink); opacity: 0.85; }

/* GitHub-style header inside Kindle */
.k-repo-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(42,40,32,0.18);
  padding-bottom: 14px;
}
.k-octicon {
  width: 18px; height: 18px;
  flex-shrink: 0;
  color: var(--eink-ink);
}
.k-repo-path {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--eink-ink);
  letter-spacing: 0;
}
.k-repo-path .k-org { opacity: 0.7; }
.k-repo-path .k-slash { opacity: 0.45; padding: 0 2px; }
.k-repo-path .k-name { font-weight: 600; }
.k-repo-vis {
  margin-left: 4px;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border: 1px solid rgba(42,40,32,0.4);
  border-radius: 999px;
  color: var(--eink-ink);
  opacity: 0.7;
}

.k-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  font-size: 12px;
  color: var(--eink-ink);
  opacity: 0.78;
}
.k-meta-row .k-stat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.k-meta-row svg { width: 12px; height: 12px; flex-shrink: 0; }

.k-desc {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(13.5px, 1.18vw, 15.5px);
  line-height: 1.55;
  color: var(--eink-ink);
  opacity: 0.85;
  margin: 0;
  max-width: 60ch;
}

/* language bar */
.k-lang-bar {
  display: flex;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  background: rgba(42,40,32,0.12);
}
.k-lang-bar > span { display: block; height: 100%; }
.k-lang-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--eink-ink);
  opacity: 0.78;
}
.k-lang-legend .dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: -1px;
}

/* file tree */
.k-tree {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--eink-ink);
  border: 1px solid rgba(42,40,32,0.18);
  border-radius: 4px;
}
.k-tree-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1.2fr) minmax(0, 2fr) auto;
  align-items: center;
  gap: 10px;
  padding: 7px 14px;
  border-bottom: 1px solid rgba(42,40,32,0.10);
}
.k-tree-row:last-child { border-bottom: 0; }
.k-tree-row svg { width: 13px; height: 13px; opacity: 0.7; }
.k-tree-row .k-tree-name { font-weight: 500; }
.k-tree-row .k-tree-msg {
  font-family: var(--serif);
  font-style: italic;
  font-size: 12.5px;
  opacity: 0.7;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.k-tree-row .k-tree-time {
  font-size: 11px;
  opacity: 0.55;
  white-space: nowrap;
}

.k-foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--eink-ink);
  opacity: 0.55;
  padding-top: 6px;
}
@media (max-width: 980px) {
  .kindle-screen { min-height: 420px; }
  .k-tree-row { grid-template-columns: 16px minmax(0, 1fr) auto; }
  .k-tree-row .k-tree-msg { display: none; }
}

/* ---------- Generic section heading ---------- */
.section-head {
  margin-bottom: clamp(24px, 7vw, 24px);
}
h2.section-title {
  font-size: clamp(38px, 5.4vw, 76px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.04;
  max-width: 18ch;
}
h2.section-title .it { font-style: italic; }

.section-body {
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.7;
  color: var(--graphite-600);
  max-width: var(--measure);
}
.section-body strong { color: var(--graphite-900); font-weight: 400; }

/* ---------- Two-column editorial ---------- */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; gap: 40px; }
}

/* ---------- Dark surface ---------- */
section.dark {
  background: var(--night);
  color: var(--night-text);
}
section.dark::before {
  /* warm grain over dark, lifted */
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  mix-blend-mode: screen;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.95  0 0 0 0 0.90  0 0 0 0 0.78  0 0 0 0.10 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 220px 220px;
  z-index: 0;
}
section.dark h2,
section.dark h3,
section.dark h4 { color: var(--night-text); }
section.dark .section-body { color: var(--night-muted); }
section.dark .section-body strong { color: var(--night-text); }

/* ---------- Paperwhite interstitial (e-ink homage) ---------- */
.paperwhite {
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-raised) 100%);
  padding: clamp(80px, 10vw, 140px) 0;
}
.paperwhite-frame {
  margin: 0 auto;
  max-width: 720px;
  background: #2a2620;
  border-radius: 12px;
  padding: 18px 18px 28px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 24px 40px -20px rgba(0,0,0,0.25);
  position: relative;
}
.paperwhite-frame::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 8px;
  transform: translateX(-50%);
  width: 26px; height: 4px;
  background: #1b1814;
  border-radius: 2px;
}
.pw-screen {
  background:
    repeating-linear-gradient(0deg, rgba(43,42,32,0.045) 0 1px, transparent 1px 2px),
    var(--eink);
  color: var(--eink-ink);
  border-radius: 4px;
  padding: 36px 38px 44px;
  font-family: var(--serif);
  position: relative;
  min-height: 220px;
  filter: contrast(0.96);
}
.pw-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--eink-ink);
  opacity: 0.55;
  margin-bottom: 28px;
}
.pw-batt {
  display: inline-block;
  width: 22px; height: 9px;
  border: 1px solid var(--eink-ink);
  position: relative;
}
.pw-batt::after {
  content: "";
  position: absolute;
  right: -3px; top: 2px;
  width: 2px; height: 5px;
  background: var(--eink-ink);
}
.pw-batt-bar {
  display: block;
  height: 100%;
  background: var(--eink-ink);
  opacity: 0.85;
}
.pw-eyebrow {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.55;
  margin: 0 0 14px;
}
.pw-quote {
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.35;
  font-weight: 400;
  margin: 0 0 26px;
  max-width: 28ch;
}
.pw-meta {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.45;
  margin: 0;
}

/* ---------- FoW canvas ---------- */
.howitworks .canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: clamp(48px, 6vw, 96px);
  border: 1px solid var(--night);
  background: var(--night);
  overflow: hidden;
  cursor: crosshair;
}
.howitworks canvas#map {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.howitworks .canvas-hint {
  position: absolute;
  left: 18px; top: 16px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--night-text);
  opacity: 0.65;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  transition: opacity 600ms var(--ease-out);
}
.howitworks .canvas-wrap:hover .canvas-hint { opacity: 0; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(48px, 6vw, 80px);
}
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step .num {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 14px;
}
.step h3 {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 400;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.step p {
  font-size: 15.5px;
  color: var(--graphite-600);
  line-height: 1.6;
  max-width: 38ch;
}
.howitworks.dark .step p { color: var(--night-muted); }
.howitworks.dark .step .num { color: var(--accent-soft); }
.howitworks.dark .canvas-wrap { border-color: var(--night-hairline); }
.howitworks.dark .canvas-hint { color: var(--night-muted); }

/* ---------- Strata stack ---------- */
.strata-intro { max-width: 720px; margin-bottom: clamp(48px, 6vw, 88px); }

.strata-stack {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  grid-template-areas:
    "tab1 cards"
    "tab2 cards"
    "tab3 cards";
  column-gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
.strata-stack .strata-tab:nth-of-type(1) { grid-area: tab1; }
.strata-stack .strata-tab:nth-of-type(2) { grid-area: tab2; }
.strata-stack .strata-tab:nth-of-type(3) { grid-area: tab3; }
.strata-stack .strata-cards { grid-area: cards; }
@media (max-width: 860px) {
  .strata-stack {
    grid-template-columns: 1fr;
    grid-template-areas: "tab1" "tab2" "tab3" "cards";
    gap: 16px;
  }
}

.strata-tab {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 14px 16px;
  text-align: left;
  padding: 18px 0;
  border-top: 1px solid var(--hairline);
  cursor: pointer;
  transition: opacity 280ms var(--ease-out), border-color 280ms var(--ease-out);
  opacity: 0.55;
}
.strata-tab:last-of-type { border-bottom: 1px solid var(--hairline); }
.strata-tab[aria-pressed="true"] { opacity: 1; border-color: var(--graphite-900); }
.strata-tab[aria-pressed="true"] + .strata-tab { border-top-color: var(--graphite-900); }
.strata-tab:hover { opacity: 0.85; }

.strata-tab-num {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
}
.strata-tab-cat {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite-600);
}
.strata-tab-title {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: -0.01em;
  line-height: 1.25;
  grid-column: 1 / -1;
}

.strata-cards {
  position: relative;
  min-height: 540px;
}
.strata-card {
  position: absolute;
  inset: 0;
  background: var(--paper);
  border: 1px solid var(--hairline);
  padding: clamp(32px, 4vw, 56px);
  transition: opacity 600ms var(--ease-out), transform 700ms var(--ease-out);
  opacity: 0;
  transform: translateY(28px) scale(0.985);
  pointer-events: none;
  box-shadow: 0 1px 0 rgba(27,26,23,0.04), 0 30px 60px -40px rgba(27,26,23,0.18);
}
.strata-card.is-active {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.strata-card.is-prev {
  opacity: 0;
  transform: translateY(-12px) scale(0.985);
}
@media (max-width: 860px) {
  .strata-cards { min-height: auto; }
  .strata-card { position: static; opacity: 1; transform: none; pointer-events: auto; display: none; }
  .strata-card.is-active { display: block; }
}

.strata-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.strata-label {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite-600);
}
.strata-status {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.strata-card h3 {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 400;
  letter-spacing: -0.012em;
  margin-bottom: 22px;
  line-height: 1.1;
}
.strata-card .summary {
  font-size: 17px;
  line-height: 1.65;
  color: var(--graphite-600);
  margin-bottom: 26px;
}
.strata-meta {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px 24px;
  border-top: 1px solid var(--hairline);
  padding-top: 22px;
  margin-top: 22px;
}
@media (max-width: 540px) {
  .strata-meta { grid-template-columns: 1fr; gap: 4px 0; }
  .strata-meta dt { margin-top: 14px; }
}
.strata-meta dt {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite-600);
  align-self: center;
}
.strata-meta dd {
  margin: 0;
  font-size: 15.5px;
  color: var(--graphite-900);
}
.strata-meta dd .tag {
  display: inline-block;
  margin-right: 10px;
  padding: 3px 9px;
  border: 1px solid var(--hairline);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--graphite-600);
}

/* ---------- Field notes ---------- */
.fieldnotes { background: var(--paper-raised); }
.fieldnotes h2.section-title { color: var(--graphite-900); }
.fieldnotes .stipple {
  margin-top: 56px;
  height: 180px;
  background-image: radial-gradient(circle at 25% 30%, var(--graphite-600) 0.6px, transparent 1.2px),
                    radial-gradient(circle at 75% 70%, var(--graphite-600) 0.6px, transparent 1.2px),
                    radial-gradient(circle at 50% 50%, var(--graphite-600) 0.4px, transparent 1px);
  background-size: 14px 14px, 22px 22px, 9px 9px;
  opacity: 0.18;
  mask-image: linear-gradient(to bottom, transparent, black 30%, black 70%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, black 30%, black 70%, transparent);
}

/* ---------- Build with us ---------- */
.build-section { overflow: hidden; }
.build-section .build-head { justify-content: center; text-align: center; }
.build-title {
  text-align: center;
  text-wrap: balance;
  max-width: min(70vw, 760px);
  margin-left: auto;
  margin-right: auto;
}
.build-body {
  text-align: center;
  text-wrap: balance;
  max-width: min(70vw, 680px);
  margin: 28px auto 0;
}
.build-section .cta-row { justify-content: center; }
.build-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 2.4vw, 32px);
  margin-top: clamp(56px, 7vw, 88px);
}
@media (max-width: 880px) { .build-grid { grid-template-columns: 1fr; } }

.build-step {
  border: 1px solid var(--night-hairline);
  background: var(--night-raised);
  padding: 26px 26px 28px;
  position: relative;
}
.build-step .build-num {
  display: block;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent-soft);
  margin-bottom: 12px;
}
.build-step h4 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
  font-weight: 400;
  color: var(--night-text);
}
.terminal {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--night-text);
  background: rgba(0,0,0,0.28);
  border: 1px solid var(--night-hairline);
  padding: 14px 16px;
  margin: 0;
  white-space: pre;
  overflow-x: auto;
}
.terminal .prompt { color: var(--accent-soft); user-select: none; margin-right: 8px; }
.terminal .comment { color: var(--night-muted); font-style: italic; }

/* ---------- Closing ---------- */
.closing {
  text-align: center;
  padding: clamp(140px, 18vw, 220px) 0;
}
.closing-eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin: 0 0 28px;
}
.closing h2 {
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 22ch;
  margin: 0 auto;
}
.closing h2 .it { font-style: italic; }
.closing .cta-row { justify-content: center; margin-top: 56px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 44px 0 32px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite-600);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  padding-right: clamp(0px, 12vw, 240px);
}
.footer-row.colophon {
  padding-right: 0;
}
.footer-bottom {
  margin-top: 36px;
  font-size: 12px;
  letter-spacing: 0.02em;
  opacity: 0.7;
}
@media (max-width: 720px) {
  .site-footer { padding-bottom: 180px; }  /* dock stacks taller on mobile */
  .footer-row { padding-right: 0; }
}

/* ---------- Dancing Colophon ---------- */
.footer-colophon { display: inline-block; }
.footer-colophon .ch {
  display: inline-block;
  will-change: transform;
  animation: colophon-wave .3s ease-in-out infinite;
  animation-delay: calc(var(--i, 0) * 90ms);
  font-weight: bold;
}
@keyframes colophon-wave {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}
@media (prefers-reduced-motion: reduce) {
  .footer-colophon .ch { animation: none; }
}

/* ---------- Sound dock (@smallbits 8x8 pixel) ---------- */
.sound-dock {
  position: fixed;
  right: 18px; bottom: 18px;
  z-index: 60;
  display: flex;
  gap: 8px;
  background: rgba(241, 236, 225, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--hairline);
  padding: 6px;
  border-radius: 0; /* hard-edged, retro device feel */
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite-600);
  transition: opacity 400ms var(--ease-out);
}
body.is-dark-context .sound-dock {
  background: rgba(22, 20, 15, 0.7);
  border-color: var(--night-hairline);
  color: var(--night-muted);
}
.sd-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid transparent;
  transition: background 220ms var(--ease-out), border-color 220ms var(--ease-out), color 220ms var(--ease-out);
}
.sd-btn:hover { background: rgba(27,26,23,0.06); border-color: var(--hairline); color: var(--graphite-900); }
body.is-dark-context .sd-btn:hover { background: rgba(255,255,255,0.06); border-color: var(--night-hairline); color: var(--night-text); }

.sd-btn .pix {
  width: 16px; height: 16px;
  shape-rendering: crispEdges;
  image-rendering: pixelated;
  fill: currentColor;
}
.sd-btn .pix-off { display: none; }
.sd-btn[aria-pressed="true"] .pix-on { display: none; }
.sd-btn[aria-pressed="true"] .pix-off { display: block; }

.sd-label {
  display: inline-block;
  min-width: 4ch;
}

/* Sub-pulse when sound is on */
.sd-mute[aria-pressed="false"] .pix-on rect:last-of-type {
  animation: pix-blink 1.6s steps(1) infinite;
}
@keyframes pix-blink {
  0%, 60% { opacity: 1; }
  61%, 100% { opacity: 0; }
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 800ms var(--ease-out), transform 900ms var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }

.reveal-mask {
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
}
.reveal-mask > span {
  display: inline-block;
  transform: translateY(105%);
  transition: transform 900ms var(--ease-out);
}
.reveal-mask.in > span { transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-mask > span { transition: none; }
  .reveal { opacity: 1; transform: none; }
  .reveal-mask > span { transform: none; }
  .sd-mute[aria-pressed="false"] .pix-on rect:last-of-type { animation: none; }
  .strata-card { transition: none; }
}

/* Grow Repo on Hero */
.build-link--primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  will-change: transform;
}

.build-link--primary:hover,
.build-link--primary:focus-visible {
  transform: scale(1.03);
}

/* ---------- Colophon ---------- */
body.colophon-page { background: var(--paper); color: var(--graphite-900); }

.col-hero {
      padding: clamp(140px, 16vw, 200px) 0 clamp(56px, 7vw, 96px);
      border-bottom: 1px solid rgba(27, 26, 23, 0.08);
    }
.col-hero .label { color: var(--accent); }
    .col-hero h1 {
      font-family: var(--serif);
      font-weight: 400;
      font-size: clamp(48px, 8vw, 96px);
      line-height: 1.02;
      letter-spacing: -0.01em;
      margin: 18px 0 28px;
      max-width: 22ch;
    }
    .col-hero .lede {
      font-family: var(--serif);
      font-size: clamp(18px, 1.6vw, 22px);
      line-height: 1.55;
      color: var(--graphite-600);
      max-width: 48ch;
      text-wrap: balance;
    }
    .col-hero .lede em { font-style: italic; color: var(--graphite-900); }

    .col-section {
      padding: clamp(56px, 8vw, 104px) 0;
      border-bottom: 1px solid rgba(27, 26, 23, 0.08);
    }
    .col-grid {
      display: grid;
      grid-template-columns: 0.32fr 1fr;
      gap: clamp(28px, 5vw, 72px);
      align-items: start;
    }
    @media (max-width: 820px) {
      .col-grid { grid-template-columns: 1fr; gap: 28px; }
    }
    .col-section h2 {
      font-family: var(--serif);
      font-weight: 400;
      font-size: clamp(28px, 3.4vw, 44px);
      line-height: 1.1;
      letter-spacing: -0.005em;
      margin: 0;
      max-width: 14ch;
    }
    .col-section h2 em { font-style: italic; color: var(--accent); }
    .col-section .col-eyebrow {
      font-family: var(--sans);
      font-size: 12px;
      letter-spacing: 0.04em;
      color: var(--graphite-600);
      margin-bottom: 10px;
    }
    .col-body p {
      font-family: var(--serif);
      font-size: 17.5px;
      line-height: 1.65;
      color: var(--graphite-900);
      max-width: 62ch;
      margin: 0 0 18px;
    }
    .col-body p.muted-graf {
      color: var(--graphite-600);
    }

    /* Typeface specimens */
    .specimen-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 28px;
    }
    .specimen {
      padding: 22px 26px;
      border: 1px solid rgba(27, 26, 23, 0.10);
      background: var(--paper-raised);
      border-radius: 4px;
    }
    .specimen .spec-name {
      font-family: var(--serif);
      font-size: clamp(34px, 4vw, 52px);
      line-height: 1;
      letter-spacing: -0.01em;
      display: block;
      margin-bottom: 6px;
    }
    .specimen.sans .spec-name { font-family: var(--sans); font-weight: 500; }
    .specimen .spec-meta {
      font-family: var(--sans);
      font-size: 13px;
      letter-spacing: 0.02em;
      color: var(--graphite-600);
      line-height: 1.5;
    }
    .specimen .spec-meta a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

    /* Generic linked reference list */
    .ref-subhead {
      font-family: var(--serif);
      font-size: 14px;
      font-weight: bold;
      text-transform: capitalize;
      color: #8a7551;
      margin: 40px 0 14px;
      padding-bottom: 6px;
      border-bottom: 1px solid rgba(27, 26, 23, 0.10);
    }
    .ref-subhead:first-child { margin-top: 0; }
    .ref-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 22px;
    }
    .ref-list li {
      padding-left: 0;
      display: grid;
      grid-template-columns: 22px 1fr;
      gap: 14px;
      align-items: start;
    }
    .ref-list .ref-num {
      font-family: var(--sans);
      font-size: 12px;
      color: var(--graphite-600);
      padding-top: 5px;
      letter-spacing: 0.04em;
    }
    .ref-list .ref-title {
      font-family: var(--serif);
      font-size: 17.5px;
      line-height: 1.45;
      color: var(--graphite-900);
      display: block;
    }
    .ref-list .ref-title em { font-style: italic; }
    .ref-list .ref-meta {
      font-family: var(--sans);
      font-size: 13px;
      color: var(--graphite-600);
      line-height: 1.55;
      margin-top: 4px;
      display: block;
    }
    .ref-list a {
      color: var(--accent);
      text-decoration: underline;
      text-underline-offset: 3px;
      text-decoration-thickness: 1px;
    }
    .ref-list a:hover { color: var(--graphite-900); }

    /* People grid */
    .people-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px 28px;
    }
    @media (max-width: 620px) {
      .people-grid { grid-template-columns: 1fr; }
    }
    .people-grid li {
      list-style: none;
      font-family: var(--serif);
      font-size: 17px;
      color: var(--graphite-900);
      line-height: 1.5;
    }
    .people-grid li .role {
      display: block;
      font-family: var(--sans);
      font-size: 12px;
      letter-spacing: 0.04em;
      color: var(--graphite-600);
      margin-top: 2px;
    }

    /* Closing note */
    .col-closing {
      padding: clamp(72px, 10vw, 140px) 0 clamp(56px, 8vw, 104px);
      text-align: center;
    }
    .col-closing p {
      font-family: var(--serif);
      font-style: italic;
      font-size: clamp(22px, 2.4vw, 32px);
      line-height: 1.4;
      color: var(--graphite-600);
      max-width: 38ch;
      margin: 0 auto;
      text-wrap: balance;
    }
    .col-closing .sig {
      font-family: var(--serif);
      font-size: 17px;
      color: var(--graphite-900);
      margin-top: 28px;
      font-style: normal;
    }
    .col-closing .sig strong { font-weight: 600; }

    .back-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-family: var(--sans);
      font-size: 14px;
      color: var(--graphite-600);
      text-decoration: none;
      margin-top: 24px;
    }
    .back-link:hover { color: var(--graphite-900); }
    .back-link::before { content: "←"; }