/* ---------------------------------------------------------------
   Euclid — shared visual system
   Paper + ink. Spectral + JetBrains Mono. Slow rhythm.
--------------------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Spectral:ital,wght@0,200;0,300;0,400;0,500;0,600;0,700;1,300;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* paper — warm cream, scholarly */
  --paper:        oklch(95.5% 0.014 78);
  --paper-deep:   oklch(92.8% 0.018 78);
  --paper-edge:   oklch(89%   0.018 76);

  /* ink — warm near-black, never pure */
  --ink:          oklch(22%   0.014 60);
  --ink-soft:     oklch(34%   0.014 60);
  --mute:         oklch(48%   0.012 65);
  --faint:        oklch(64%   0.012 70);
  --hairline:     oklch(82%   0.012 72);
  --hairline-2:   oklch(88%   0.010 75);

  /* accent — restrained classical blue */
  --accent:       oklch(44%   0.085 248);
  --accent-soft:  oklch(58%   0.065 250);
  --accent-tint:  oklch(90%   0.025 248);

  /* type */
  --serif:  'Spectral', 'Source Serif Pro', Georgia, serif;
  --mono:   'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;

  /* measure */
  --measure-prose: 38rem;     /* ~608px reading column */
  --measure-wide:  64rem;     /* editorial container */
  --measure-full:  84rem;

  /* rhythm */
  --rhythm:   1.7rem;
  --rhythm-l: 2.4rem;
  --rhythm-xl: 4rem;

  --density: 1;  /* tweakable */
}

/* themes ------------------------------------------------------- */
[data-theme="vellum"] {
  --paper:      oklch(94% 0.024 76);
  --paper-deep: oklch(91% 0.028 76);
  --paper-edge: oklch(88% 0.030 75);
  --hairline:   oklch(80% 0.020 72);
  --hairline-2: oklch(86% 0.018 74);
}
[data-theme="slate"] {
  --paper:      oklch(18% 0.010 70);
  --paper-deep: oklch(22% 0.012 70);
  --paper-edge: oklch(26% 0.014 68);
  --ink:        oklch(92% 0.014 78);
  --ink-soft:   oklch(82% 0.014 78);
  --mute:       oklch(64% 0.012 70);
  --faint:      oklch(48% 0.012 65);
  --hairline:   oklch(34% 0.014 70);
  --hairline-2: oklch(28% 0.012 70);
  --accent:     oklch(72% 0.080 250);
  --accent-soft: oklch(62% 0.060 250);
  --accent-tint: oklch(28% 0.040 248);
}

/* accents */
[data-accent="indigo"] { --accent: oklch(44% 0.085 270); --accent-soft: oklch(58% 0.065 270); --accent-tint: oklch(90% 0.025 270); }
[data-accent="ochre"]  { --accent: oklch(48% 0.085 65);  --accent-soft: oklch(60% 0.070 65);  --accent-tint: oklch(91% 0.030 70); }
[data-accent="sage"]   { --accent: oklch(44% 0.060 165); --accent-soft: oklch(58% 0.050 165); --accent-tint: oklch(91% 0.020 165); }
[data-accent="oxblood"]{ --accent: oklch(40% 0.090 24);  --accent-soft: oklch(54% 0.075 24);  --accent-tint: oklch(91% 0.025 24); }

/* density */
[data-density="generous"] { --rhythm: 2.1rem; --rhythm-l: 3rem; --rhythm-xl: 5rem; }

/* base --------------------------------------------------------- */
* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-feature-settings: "onum" 1, "kern" 1, "liga" 1;
  font-size: 23px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-tint); color: var(--ink); }

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
  transition: border-color .25s ease, color .25s ease;
}
a:hover { border-color: var(--accent); color: var(--accent); }
a.plain { border: 0; }

p { margin: 0 0 var(--rhythm); text-wrap: pretty; hanging-punctuation: first last; }

h1, h2, h3, h4, h5 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.012em;
  margin: 0 0 1rem;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 5.4vw, 4.4rem); font-weight: 300; line-height: 1.05; letter-spacing: -0.022em; }
h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); font-weight: 400; line-height: 1.18; letter-spacing: -0.016em; }
h3 { font-size: 1.25rem; font-weight: 500; line-height: 1.3; }
h4 { font-size: 1rem; font-weight: 500; }

em { font-style: italic; }
strong { font-weight: 600; }
hr { border: 0; border-top: 1px solid var(--hairline); margin: var(--rhythm-l) 0; }

blockquote {
  margin: var(--rhythm-l) 0;
  padding-left: 1.4rem;
  border-left: 1px solid var(--accent);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.05em;
}
blockquote p:last-child { margin-bottom: 0; }

code, pre, .mono { font-family: var(--mono); font-size: 0.86em; }
code { color: var(--ink-soft); }

ul, ol { padding-left: 1.5rem; margin: 0 0 var(--rhythm); }
li { margin-bottom: 0.4rem; }

/* layout primitives ------------------------------------------- */
.container       { max-width: var(--measure-wide); margin: 0 auto; padding: 0 2rem; }
.container-prose { max-width: var(--measure-prose); margin: 0 auto; padding: 0 1.5rem; }
.container-full  { max-width: var(--measure-full); margin: 0 auto; padding: 0 2rem; }

@media (max-width: 640px) {
  .container, .container-prose, .container-full { padding: 0 1.25rem; }
  body { font-size: 17.5px; }
}

/* hairlines */
.rule { border: 0; border-top: 1px solid var(--hairline); }
.rule-thick { border: 0; border-top: 1px solid var(--ink); }

/* labels (small-caps mono) ------------------------------------ */
.label, .eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}
.label-ink { color: var(--ink); }
.label-accent { color: var(--accent); }

.section-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--faint);
}

/* nav ---------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in oklch, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.site-header__inner {
  max-width: var(--measure-full);
  margin: 0 auto;
  padding: 1.05rem 2rem;
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 2rem;
}
.brand {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  border: 0;
  display: inline-flex; align-items: baseline; gap: 0.55rem;
}
.brand .glyph {
  display: inline-block; width: 14px; height: 14px;
  border: 1px solid var(--ink);
  transform: rotate(45deg);
  position: relative; top: 1px;
}
.brand small {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
  margin-left: 0.4rem;
  font-weight: 500;
}
.nav { display: flex; gap: 1.6rem; align-items: baseline; }
.nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  border: 0;
  letter-spacing: 0.005em;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.nav a[aria-current="page"] { color: var(--ink); }
.nav .num {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  color: var(--faint);
  margin-right: 0.35rem;
}

@media (max-width: 880px) {
  /* Wrap the header onto a second row instead of trying to fit the brand
     and seven nav items on one line. The brand stays on its own row at
     the top; the nav drops below it and wraps as needed. */
  .site-header__inner {
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem 1rem;
    padding: 0.8rem 1.2rem;
  }
  .nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.5rem 1.1rem;
    justify-content: flex-start;
  }
  .nav .num { display: none; }
  .nav a { font-size: 0.85rem; }
  .brand small { display: none; }
}

/* footer ------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  margin-top: 8rem;
  padding: 4rem 0 5rem;
  color: var(--mute);
  font-size: 0.92rem;
}
.site-footer__inner {
  max-width: var(--measure-full);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
}
.site-footer h5 {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 1rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 0.55rem; }
.site-footer a { border: 0; color: var(--mute); }
.site-footer a:hover { color: var(--accent); }
.colophon { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); letter-spacing: 0.05em; }

/* Citation links — htag (history) and pref (proof list) — when rendered
   as <a> by EuclidRefs.tag(): show clear hover feedback even though their
   surrounding pill/tag styling is more specific than the default a:hover. */
a.htag:hover, a.pref:hover { border-color: var(--accent); color: var(--accent); }

/* Ask-the-tutor controls (lab.html and lab-prop.html share these). */
.socratic-controls { margin-top: 0.9rem; display: flex; align-items: center; gap: 0.9rem; flex-wrap: wrap; }
.ask-tutor {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--paper-deep); color: var(--ink); border: 1px solid var(--hairline);
  padding: 0.45rem 0.85rem; cursor: pointer;
  transition: border-color 200ms ease, color 200ms ease;
}
.ask-tutor:hover:not([disabled]) { border-color: var(--accent); color: var(--accent); }
.ask-tutor[disabled] { opacity: 0.5; cursor: not-allowed; }
.ask-tutor-status {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.05em; color: var(--mute);
}
.ask-tutor-status a { color: var(--accent); }
.ask-tutor-status.is-thinking::after { content: " ▍"; animation: blink 1s steps(2, end) infinite; }
@keyframes blink { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

/* a11y utilities ------------------------------------------------ */
/* Visually hidden but available to assistive tech. */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Skip link: hidden until focused, then visible top-left. */
.skip-link {
  position: absolute;
  top: -100px; left: 0;
  z-index: 1000;
  padding: 0.7rem 1.1rem;
  background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em;
  border: 0; text-decoration: none;
  transition: top 120ms ease;
}
.skip-link:focus { top: 0; }

/* footer bottom row: copyright on the left, meta links on the right */
.site-footer__bottom {
  display: flex !important;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.4rem;
  flex-wrap: wrap;
}
.site-footer__meta {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.site-footer__meta a {
  color: var(--mute);
  border-bottom: 1px solid var(--hairline-2);
  padding-bottom: 1px;
}
.site-footer__meta a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
}

/* buttons ------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1rem;
  padding: 0.85rem 1.4rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--hairline);
}
.btn--ghost:hover { border-color: var(--ink); background: transparent; color: var(--ink); }
.btn .arrow { font-family: var(--mono); font-size: 0.85em; opacity: 0.7; }

/* hero --------------------------------------------------------- */
.hero {
  padding: clamp(4rem, 9vw, 8rem) 0 clamp(3rem, 6vw, 6rem);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
@media (max-width: 880px) {
  .hero__grid { grid-template-columns: 1fr; }
}
.hero__title {
  font-size: clamp(2.6rem, 5.6vw, 4.6rem);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -0.025em;
  margin-bottom: 1.6rem;
}
.hero__title em { font-style: italic; font-weight: 300; color: var(--accent); }
.hero__lede {
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 30rem;
  margin-bottom: 2.4rem;
}
.hero__cta { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* section openers --------------------------------------------- */
.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  position: relative;
}
.section--ruled { border-top: 1px solid var(--hairline); }
.section__head {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
  align-items: baseline;
}
.section__head .num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--faint);
  padding-top: 0.6rem;
}
.section__head h2 {
  max-width: 30ch;
  font-weight: 300;
  letter-spacing: -0.018em;
}

@media (max-width: 720px) {
  .section__head { grid-template-columns: 1fr; gap: 0.5rem; }
}

/* prose elements ---------------------------------------------- */
.lede {
  font-size: 1.28rem;
  line-height: 1.55;
  color: var(--ink-soft);
  font-weight: 300;
  margin-bottom: var(--rhythm-l);
}
.dropcap::first-letter {
  font-family: var(--serif);
  font-size: 4.6em;
  font-weight: 300;
  float: left;
  line-height: 0.85;
  margin: 0.08em 0.08em 0 -0.04em;
  color: var(--ink);
}

/* aphorism / pull */
.aphorism {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1.6rem;
  line-height: 1.4;
  color: var(--ink);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 2rem 0;
  margin: var(--rhythm-xl) 0;
  text-wrap: balance;
}

/* cards / grid ------------------------------------------------ */
.cards {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hairline);
}
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.cards--2 { grid-template-columns: repeat(2, 1fr); }
.card {
  border-bottom: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  padding: 2.2rem 1.8rem 2.4rem;
  transition: background .25s ease;
  position: relative;
}
.cards--3 .card:nth-child(3n) { border-right: 0; }
.cards--2 .card:nth-child(2n) { border-right: 0; }
.card:hover { background: var(--paper-deep); }
.card .num { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.15em; color: var(--faint); }
.card h3 { margin: 0.6rem 0 0.7rem; font-weight: 400; font-size: 1.2rem; letter-spacing: -0.01em; }
.card p { font-size: 0.96rem; color: var(--ink-soft); margin: 0; line-height: 1.55; }

@media (max-width: 880px) {
  .cards--3 { grid-template-columns: repeat(2, 1fr); }
  .cards--3 .card:nth-child(3n) { border-right: 1px solid var(--hairline); }
  .cards--3 .card:nth-child(2n) { border-right: 0; }
}
@media (max-width: 600px) {
  .cards--3, .cards--2 { grid-template-columns: 1fr; }
  .card { border-right: 0 !important; }
}

/* essays list ------------------------------------------------- */
.essay-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--hairline); }
.essay-list li {
  display: grid;
  grid-template-columns: 5rem 1fr auto;
  gap: 2rem;
  align-items: baseline;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--hairline);
  margin: 0;
}
.essay-list .num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.15em; color: var(--faint); }
.essay-list .title {
  font-family: var(--serif); font-size: 1.3rem; font-weight: 400;
  letter-spacing: -0.012em; color: var(--ink); border: 0;
}
.essay-list .title:hover { color: var(--accent); }
.essay-list .meta { font-family: var(--mono); font-size: 0.74rem; color: var(--mute); letter-spacing: 0.05em; }
.essay-list .desc { font-size: 0.95rem; color: var(--ink-soft); margin-top: 0.3rem; max-width: 42rem; }

@media (max-width: 600px) {
  .essay-list li { grid-template-columns: 1fr; gap: 0.4rem; }
}

/* Euclid I.1 figure ------------------------------------------- */
.figure {
  background: var(--paper-deep);
  border: 1px solid var(--hairline);
  position: relative;
  overflow: hidden;
}
.figure__svg { display: block; width: 100%; height: auto; }
.figure__caption {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mute);
  padding: 0.9rem 1.2rem;
  border-top: 1px solid var(--hairline);
  display: flex; justify-content: space-between; gap: 1rem;
}

/* lab interactive container */
.lab-stage {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0;
  border: 1px solid var(--hairline);
  background: var(--paper-deep);
  margin: var(--rhythm-l) 0;
}
.lab-canvas {
  background:
    linear-gradient(var(--hairline-2) 1px, transparent 1px) 0 0/24px 24px,
    linear-gradient(90deg, var(--hairline-2) 1px, transparent 1px) 0 0/24px 24px,
    var(--paper);
  position: relative;
  min-height: 420px;
}
.lab-side {
  border-left: 1px solid var(--hairline);
  padding: 1.6rem;
  background: var(--paper-deep);
  font-size: 0.96rem;
}
@media (max-width: 880px) {
  .lab-stage { grid-template-columns: 1fr; }
  .lab-side { border-left: 0; border-top: 1px solid var(--hairline); }
}

.lab-step {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.6rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--hairline-2);
  cursor: pointer;
  align-items: baseline;
}
.lab-step:last-child { border-bottom: 0; }
.lab-step .n {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--faint);
  padding-top: 0.15em;
}
.lab-step.is-active .n { color: var(--accent); }
.lab-step.is-active .text { color: var(--ink); }
.lab-step .text {
  font-family: var(--serif);
  color: var(--mute);
  line-height: 1.45;
  transition: color .2s ease;
}
.lab-step .ref {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  display: block;
  margin-top: 0.25rem;
  opacity: 0.85;
}

.lab-controls {
  display: flex; gap: 0.6rem; align-items: center;
  padding: 1rem 1.2rem;
  border-top: 1px solid var(--hairline);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--mute);
  letter-spacing: 0.04em;
}
.lab-controls button {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--ink);
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  transition: all .2s ease;
}
.lab-controls button:hover { border-color: var(--ink); }
.lab-controls button[disabled] { color: var(--faint); border-color: var(--hairline-2); cursor: not-allowed; }
.lab-controls .spacer { flex: 1; }
.lab-progress {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mute);
}

/* SVG construction styling */
.eu-line { stroke: var(--ink); stroke-width: 1.4; fill: none; }
.eu-line--given { stroke: var(--ink); stroke-width: 1.8; }
.eu-line--result { stroke: var(--accent); stroke-width: 1.8; }
.eu-circle { stroke: var(--ink-soft); stroke-width: 1.1; fill: none; }
.eu-circle.dim { stroke: var(--hairline); stroke-dasharray: 2 3; }
.eu-pt { fill: var(--ink); }
.eu-pt--result { fill: var(--accent); }
.eu-label { font-family: var(--serif); font-size: 14px; fill: var(--ink); font-style: italic; }
.eu-aux { stroke-dasharray: 3 4; stroke: var(--mute); stroke-width: 1; fill: none; }
/* Equality tick marks: small perpendicular dashes centred on a segment.
   Two segments sharing the same tick count visually claim equal length —
   the supposition the figure embodies. Used by I.7's given figure to mark
   the four claimed-equal segments of the reductio. */
.eu-tick { stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; fill: none; }

/* Degenerate state: a derived element whose recipe cannot be solved at the
   current parent positions (e.g. circles drifted apart after a drag), or
   whose parent is itself degenerate. The geometry shown is stale; fade it
   so the user can see which parts of the figure are no longer trustworthy. */
.eu-degenerate { opacity: 0.22; }
.eu-pt.eu-degenerate { opacity: 0.3; }
.eu-label.eu-degenerate { opacity: 0.35; }

/* Hit lines for given segments / circles — invisible thicker stroke
   layered atop the visible shape so it accepts pointerdown for drag. */
.eu-segment-hit { stroke: transparent; stroke-width: 14; fill: none; cursor: grab; }
.eu-segment-hit:active { cursor: grabbing; }
.eu-circle-hit  { stroke: transparent; stroke-width: 12; fill: none; cursor: grab; }
.eu-circle-hit:active { cursor: grabbing; }

/* Lab minimap (bottom-left overlay on lab.html / lab-prop.html).
   Explicit width/height because `.canvas svg { width:100%; height:100% }`
   in lab-prop's inline CSS would otherwise blow this up to fill the canvas. */
svg.eu-minimap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  width: 140px;
  height: 100px;
  background: oklch(from var(--paper) l c h / 0.88);
  border: 1px solid var(--hairline);
  cursor: pointer;
  z-index: 5;
  display: block;
}
.eu-minimap:hover { border-color: var(--accent); }
.eu-mm-bg       { fill: var(--paper); }
.eu-mm-ext      { stroke: var(--ink); stroke-width: 4; stroke-dasharray: 12 8; opacity: 0.55; }
.eu-mm-circle   { stroke: var(--ink-soft); stroke-width: 3; fill: none; opacity: 0.6; }
.eu-mm-line          { stroke: var(--accent); stroke-width: 5; }
.eu-mm-line--given   { stroke: var(--ink);    stroke-width: 6; }
.eu-mm-pt          { fill: var(--accent); }
.eu-mm-pt--given   { fill: var(--ink); }
.eu-mm-vp { fill: oklch(from var(--accent) l c h / 0.10); stroke: var(--accent); stroke-width: 2; vector-effect: non-scaling-stroke; pointer-events: none; }
.fade { opacity: 0; transition: opacity .5s ease; }
.fade.in { opacity: 1; }

/* dependency chips */
.dep {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  padding: 0.18rem 0.5rem;
  border: 1px solid var(--hairline);
  color: var(--mute);
  margin: 0.2rem 0.3rem 0.2rem 0;
  text-decoration: none;
}
a.dep:hover { color: var(--ink); border-color: var(--ink); }
.dep[data-active="true"] { color: var(--accent); border-color: var(--accent); }

/* sidenote / margin note */
.marginnote {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--mute);
  line-height: 1.45;
  border-left: 1px solid var(--accent);
  padding-left: 1rem;
  margin: var(--rhythm) 0;
}

/* path cards (reading paths) ---------------------------------- */
.paths {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--hairline);
}
.path {
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 2.4rem 2rem 2.6rem;
}
.paths .path:nth-child(2n) { border-right: 0; }
.path .num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.18em; color: var(--accent); }
.path h3 { margin: 0.5rem 0 0.6rem; font-weight: 400; font-size: 1.35rem; letter-spacing: -0.014em; }
.path p { font-size: 0.96rem; color: var(--ink-soft); margin: 0 0 1rem; }
.path ol {
  list-style: none;
  padding: 0; margin: 1rem 0 0;
  border-top: 1px solid var(--hairline-2);
}
.path li {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--mute);
  letter-spacing: 0.02em;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--hairline-2);
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.6rem;
  margin: 0;
}
.path li .step { color: var(--faint); letter-spacing: 0.1em; }
@media (max-width: 720px) {
  .paths { grid-template-columns: 1fr; }
  .path { border-right: 0; }
}

/* manifesto closing */
.closing {
  text-align: center;
  padding: 6rem 0;
  border-top: 1px solid var(--hairline);
  margin-top: 6rem;
}
.closing .glyph {
  display: inline-block; width: 18px; height: 18px;
  border: 1px solid var(--ink);
  transform: rotate(45deg);
  margin-bottom: 2rem;
}
.closing p {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1.4rem;
  color: var(--ink);
  max-width: 32rem;
  margin: 0 auto;
  line-height: 1.45;
}

/* tweaks panel ------------------------------------------------ */
.tweaks-fab {
  position: fixed;
  bottom: 1.4rem; right: 1.4rem;
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--hairline);
  cursor: pointer;
  z-index: 50;
  display: none;
  align-items: center; justify-content: center;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-soft);
  transition: all .2s ease;
}
.tweaks-fab:hover { border-color: var(--ink); }
.tweaks-fab[data-show="1"] { display: flex; }

.tweaks-panel {
  position: fixed;
  bottom: 1.4rem; right: 1.4rem;
  width: 296px;
  background: var(--paper);
  border: 1px solid var(--ink);
  z-index: 60;
  display: none;
  font-family: var(--serif);
  font-size: 0.92rem;
}
.tweaks-panel[data-open="1"] { display: block; }
.tweaks-panel header {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: space-between;
}
.tweaks-panel header h6 {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink);
}
.tweaks-panel header button {
  background: transparent; border: 0; cursor: pointer;
  font-family: var(--mono); font-size: 0.85rem; color: var(--mute);
}
.tweaks-panel section { padding: 0.95rem 1rem; border-bottom: 1px solid var(--hairline); }
.tweaks-panel section:last-child { border-bottom: 0; }
.tweaks-panel .field-label {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 0.55rem;
}
.tw-row { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.tw-chip {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--hairline);
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .15s ease;
}
.tw-chip:hover { border-color: var(--ink-soft); }
.tw-chip[data-active="1"] { border-color: var(--ink); color: var(--ink); background: var(--paper-deep); }
.tw-swatch {
  width: 22px; height: 22px;
  border: 1px solid var(--hairline);
  cursor: pointer;
  position: relative;
  border-radius: 50%;
}
.tw-swatch[data-active="1"]::after {
  content: ""; position: absolute; inset: -4px;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

/* misc -------------------------------------------------------- */
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--mute);
  border: 1px solid var(--hairline);
  padding: 0.18rem 0.55rem;
}

/* utility */
.muted  { color: var(--mute); }
.faint  { color: var(--faint); }
.accent { color: var(--accent); }
.center { text-align: center; }
.mt-l { margin-top: var(--rhythm-l); }
.mt-xl { margin-top: var(--rhythm-xl); }
.mb-l { margin-bottom: var(--rhythm-l); }
.mb-xl { margin-bottom: var(--rhythm-xl); }

/* glossary ---------------------------------------------------- */
.glossary { border-top: 1px solid var(--hairline); }
.term {
  display: grid;
  grid-template-columns: 14rem 1fr;
  gap: 3rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--hairline);
  align-items: baseline;
}
.term h3 { font-weight: 400; font-size: 1.2rem; letter-spacing: -0.01em; }
.term .syn {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--mute);
  margin-top: 0.4rem;
  display: block;
}
.term p { font-size: 1rem; color: var(--ink-soft); }
.term p:last-child { margin-bottom: 0; }
@media (max-width: 720px) {
  .term { grid-template-columns: 1fr; gap: 0.6rem; }
}