/* The Completion Illusion — site styles
   DNA: black background, cream serif title, red accent, monospace details. */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg: #0c0b0a;
  --bg-elev: #14110f;
  --bg-soft: #1a1715;
  --ink: #ece5d6;       /* cream, off the cover */
  --ink-soft: #b9b09e;
  --ink-mute: #756d5e;
  --rule: #2a2622;
  --accent: #c33b2c;     /* spine red */
  --accent-dim: #7a2218;
  --green: #4a8a47;      /* dot ring green */
  --serif: 'EB Garamond', 'Garamond', 'Baskerville Old Face', Baskerville, 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --maxw: 1180px;
  --gutter: clamp(20px, 4vw, 56px);
}

[data-theme="paper"] {
  --bg: #ece5d6;
  --bg-elev: #e3dac8;
  --bg-soft: #d8cdb8;
  --ink: #1a1714;
  --ink-soft: #4a4036;
  --ink-mute: #8a7e6c;
  --rule: #c3b9a4;
  --accent: #b8311f;
  --accent-dim: #7a2218;
  --green: #3f7a3c;
}

[data-theme="charcoal"] {
  --bg: #1c1a18;
  --bg-elev: #25221f;
  --bg-soft: #2c2925;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

/* ---------- Layout helpers ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 var(--gutter); }
.wrap-wide { max-width: 1320px; margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px var(--gutter);
  max-width: 1320px; margin: 0 auto;
}
.nav-brand {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.nav-brand .tci-mark {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  margin-right: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.nav-links { display: flex; gap: 28px; align-items: center; font-size: 14px; }
.nav-links a { color: var(--ink-soft); transition: color .15s ease; }
.nav-links a.active, .nav-links a:hover { color: var(--ink); }
.nav-buy {
  font-family: var(--sans);
  font-size: 13px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--ink) !important;
  letter-spacing: 0.02em;
  transition: all .15s ease;
}
.nav-buy:hover { border-color: var(--accent); color: var(--accent) !important; }

@media (max-width: 720px) {
  .nav-links { gap: 16px; font-size: 13px; }
  .nav-links .nav-link-hide { display: none; }
}

/* ---------- Type ---------- */
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.005em; line-height: 1.08; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(44px, 7vw, 96px); }
h2 { font-size: clamp(32px, 4.4vw, 56px); }
h3 { font-size: clamp(22px, 2.6vw, 32px); }
.subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(18px, 2vw, 24px);
  color: var(--ink-soft);
  font-weight: 400;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.eyebrow .dot {
  display: inline-block; width: 6px; height: 6px;
  background: var(--accent); border-radius: 50%;
  margin-right: 8px; vertical-align: middle;
}

p { text-wrap: pretty; }
.lede {
  font-family: var(--serif);
  font-size: clamp(20px, 2vw, 24px);
  line-height: 1.5;
  color: var(--ink);
}

.mono { font-family: var(--mono); }
.serif { font-family: var(--serif); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 12px 20px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: all .18s ease;
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #d44a3a; border-color: #d44a3a; color: #fff; }
.btn .arr { font-family: var(--mono); }

/* ---------- Sections ---------- */
section { padding: clamp(80px, 10vh, 140px) 0; position: relative; }
.section-head { display: grid; gap: 14px; margin-bottom: 56px; max-width: 760px; }
.section-divider { height: 1px; background: var(--rule); margin: 0; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--rule);
  padding: 56px 0 40px;
  margin-top: 80px;
  font-size: 13px;
  color: var(--ink-mute);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer h4 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 16px;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer .colophon {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.5;
  font-style: italic;
}
.footer .meta {
  margin-top: 40px;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}
@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer .meta { flex-direction: column; gap: 8px; }
}

/* ---------- Cover ring (the cover come to life) ---------- */
.ring-stage {
  position: relative;
  width: min(520px, 80vw);
  aspect-ratio: 1;
  margin: 0 auto;
}
.ring-stage svg { width: 100%; height: 100%; display: block; }
.ring-center {
  position: absolute; inset: 0;
  display: grid; place-items: center; text-align: center;
  pointer-events: none;
}
.ring-pct {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  font-weight: 400;
}
.ring-label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-top: 6px;
}
.ring-todo {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-mute);
  text-align: center;
  margin-top: 20px;
  letter-spacing: 0.04em;
}

/* ---------- Pull quote ---------- */
blockquote.pull {
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.18;
  font-weight: 400;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
  font-style: italic;
}
blockquote.pull::before { content: "“"; color: var(--accent); margin-right: -4px; }
blockquote.pull::after { content: "”"; color: var(--accent); margin-left: -4px; }
.pull-attr {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ---------- Cards / grid ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 920px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.card {
  border: 1px solid var(--rule);
  padding: 28px;
  background: var(--bg-elev);
  border-radius: 2px;
}
.card-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex; align-items: baseline; gap: 8px;
}
.card-num .ord { color: var(--ink-mute); }
.card h3 { font-size: 24px; margin-bottom: 12px; }
.card p { color: var(--ink-soft); font-size: 15px; line-height: 1.55; margin: 0; }

/* ---------- Code block ---------- */
.code {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: 22px 24px;
  border-radius: 2px;
  overflow: auto;
  white-space: pre;
  color: var(--ink-soft);
}
.code .kw { color: #c8a673; }
.code .str { color: #8aa890; }
.code .com { color: var(--ink-mute); font-style: italic; }
.code .fn { color: #d4c4a3; }
.code .err { color: var(--accent); text-decoration: underline wavy var(--accent); }
.code .add { background: rgba(74, 138, 71, 0.12); display: block; }
.code .del { background: rgba(195, 59, 44, 0.12); display: block; }

/* ---------- TOC list ---------- */
.toc-row {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  transition: padding-left .2s ease;
}
.toc-row:hover { padding-left: 8px; }
.toc-row:hover .toc-num { color: var(--accent); }
.toc-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  transition: color .2s ease;
}
.toc-title { font-family: var(--serif); font-size: clamp(20px, 2.2vw, 28px); }
.toc-teaser { color: var(--ink-soft); font-size: 14px; margin-top: 6px; max-width: 64ch; }
.toc-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ---------- Tweaks panel ---------- */
.tw-panel {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 280px;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 18px;
  z-index: 100;
  font-size: 13px;
  display: none;
  font-family: var(--sans);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}
.tw-panel.open { display: block; }
.tw-panel h4 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin: 0 0 16px 0;
  color: var(--ink-soft);
}
.tw-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.tw-row label {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
}
.tw-segs { display: flex; gap: 4px; }
.tw-segs button {
  flex: 1;
  padding: 7px 8px;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 12px;
  cursor: pointer;
  border-radius: 2px;
}
.tw-segs button.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.tw-close {
  position: absolute; top: 12px; right: 12px;
  background: transparent; border: none; cursor: pointer;
  color: var(--ink-mute); font-family: var(--mono); font-size: 14px;
}
.tw-swatch-row { display: flex; gap: 8px; }
.tw-swatch {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1px solid var(--rule);
  cursor: pointer;
}
.tw-swatch.on { box-shadow: 0 0 0 2px var(--ink); }

/* ---------- Misc utilities ---------- */
.label-line {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.label-line::before, .label-line::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}
.label-line::after { display: none; }

.kbd {
  font-family: var(--mono);
  font-size: 11px;
  border: 1px solid var(--rule);
  padding: 2px 6px;
  border-radius: 2px;
  color: var(--ink-soft);
}