/* ============================================================
   PT. MIMPI SEMESTA INDONESIA — "The Dream Atlas" (v3)
   One world: printed star-atlas on warm cream, ink + leaf-gold,
   hairline rules, marginalia, folios, filed registry document,
   a process star chart, and night pages for contact.
   ENGINEERING CONTRACT: every length derives from tokens.
   No magic numbers inside components.
   ============================================================ */

:root {
  /* ---- paper & ink ---- */
  --paper: #f6f1e7;
  --paper-2: #efe8d6;
  --ink: #16141f;
  --ink-soft: #4a4657;
  --gold: #b08514;        /* graphics on paper */
  --gold-ink: #82620e;    /* accent text on paper (AA) */
  --gold-l: #e0b23e;      /* graphics on night */
  --night: #14121f;
  --night-fg: #efe9db;
  --night-muted: #a29cb5;
  --terra-l: #d98a68;     /* illustration routes on night */

  /* ---- hairlines ---- */
  --hair: rgba(22, 20, 31, 0.22);
  --hair-soft: rgba(22, 20, 31, 0.12);
  --hair-night: rgba(239, 233, 219, 0.18);

  /* ---- type ---- */
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "Space Mono", "SFMono-Regular", Menlo, monospace;

  /* fluid type scale — every step, one formula */
  --fs-mono: clamp(0.66rem, 0.62rem + 0.2vw, 0.78rem);
  --fs-body: clamp(1rem, 0.95rem + 0.3vw, 1.15rem);
  --fs-lede: clamp(1.2rem, 1.05rem + 0.8vw, 1.6rem);
  --fs-h3: clamp(1.25rem, 1.1rem + 0.7vw, 1.7rem);
  --fs-h2: clamp(1.9rem, 1.5rem + 2vw, 3.1rem);
  --fs-h1: clamp(2.9rem, 2rem + 5.4vw, 6.2rem);

  /* ---- space: 4px base, half-steps via calc only ---- */
  --u: 4px;
  --s1: var(--u);             /*   4 */
  --s2: calc(var(--u) * 2);   /*   8 */
  --s3: calc(var(--u) * 3);   /*  12 */
  --s4: calc(var(--u) * 4);   /*  16 */
  --s6: calc(var(--u) * 6);   /*  24 */
  --s8: calc(var(--u) * 8);   /*  32 */
  --s12: calc(var(--u) * 12); /*  48 */
  --s16: calc(var(--u) * 16); /*  64 */
  --s24: calc(var(--u) * 24); /*  96 */
  --s32: calc(var(--u) * 32); /* 128 */

  /* ---- layout ---- */
  --content: 1280px;
  --gutter: clamp(var(--s6), 4vw, var(--s12));
  --masthead-h: 64px;

  /* ---- motion ---- */
  --t-fast: 160ms;
  --t-slow: 700ms;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  /* ---- radii: print-shop squareness ---- */
  --r-doc: 3px;
}

/* ================= base ================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

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

:focus-visible {
  outline: 2px solid var(--gold-ink);
  outline-offset: 3px;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-optical-sizing: auto;
  text-wrap: balance;
  margin: 0;
}

p {
  text-wrap: pretty;
}

/* paper grain, barely-there */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

/* ================= primitives ================= */
.shell {
  max-width: var(--content);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section[id] {
  scroll-margin-top: calc(var(--masthead-h) + var(--s2));
}

.skip-link {
  position: absolute;
  left: var(--s4);
  top: -200%;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  padding: var(--s3) var(--s4);
  border-radius: var(--r-doc);
  text-decoration: none;
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus {
  top: var(--s4);
}

/* mono label */
.kicker {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: var(--s2);
  margin: 0 0 var(--s4);
}

.kicker-star {
  color: var(--gold-ink);
}

/* folio page numbers */
.folio {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter) var(--s4);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: right;
}

.folio::before {
  content: "";
  display: block;
  width: var(--s6);
  border-top: 1px solid var(--hair);
  margin-left: auto;
  margin-bottom: var(--s2);
}

/* buttons — print-shop square */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: var(--s3) var(--s6);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--r-doc);
  border: 1.5px solid var(--ink);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn-ink {
  background: var(--ink);
  color: var(--paper);
}

.btn-ink:hover {
  background: transparent;
  color: var(--ink);
}

/* inked-in underline link */
.link-ink {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  padding-bottom: var(--s1, 4px);
  background-image: linear-gradient(var(--gold-ink), var(--gold-ink));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 2px;
  transition: background-size var(--t-slow) var(--ease);
}

.link-ink:hover {
  background-size: 100% 2px;
}

/* ================= masthead ================= */
.masthead {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--hair);
}

.masthead-row {
  display: flex;
  align-items: center;
  gap: var(--s6);
  min-height: var(--masthead-h);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.25rem);
  font-weight: 560;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
}

/* "The Constellation M" — glyph inks from text color,
   the valley dream-sparkle carries the gold */
.wordmark .glyph {
  flex: none;
}

.wordmark .glyph-star {
  fill: var(--gold-ink);
}

.colophon .wordmark .glyph-star {
  fill: var(--gold-l);
}

.mast-nav {
  margin-left: auto;
}

.mast-nav ul {
  display: flex;
  gap: var(--s6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.mast-nav a {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.mast-nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

.mast-cta {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border: 1.5px solid var(--ink);
  border-radius: var(--r-doc);
  padding: var(--s2) var(--s4);
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.mast-cta:hover {
  background: var(--ink);
  color: var(--paper);
}

/* EN | ID language toggle — same print-shop squareness */
.lang-toggle {
  display: inline-flex;
  border: 1.5px solid var(--ink);
  border-radius: var(--r-doc);
  overflow: hidden;
  flex: none;
}

.lang-toggle button {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: var(--s2) var(--s3);
  min-height: 32px;
  background: transparent;
  border: 0;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.lang-toggle button + button {
  border-left: 1.5px solid var(--ink);
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.lang-toggle button:not([aria-pressed="true"]):hover {
  color: var(--ink);
  background: var(--paper-2);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--ink);
  border-radius: var(--r-doc);
  color: var(--ink);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--s2) var(--s3);
  cursor: pointer;
}

/* ================= 01 · cover ================= */
.cover {
  position: relative;
  padding-top: calc(var(--masthead-h) + var(--s24));
  padding-bottom: var(--s12);
  border-bottom: 1px solid var(--hair);
  overflow: clip;
}

.spine {
  position: absolute;
  top: calc(var(--masthead-h) + var(--s16));
  left: max(calc((100% - var(--content)) / 2 - 56px), var(--s2));
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: 0.7;
  margin: 0;
  white-space: nowrap;
}

.cover-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: var(--s16);
  align-items: end;
}

.cover-main {
  max-width: 62rem;
}

.cover h1 {
  font-size: var(--fs-h1);
  font-weight: 380;
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin-bottom: var(--s6);
}

.cover h1 em {
  font-style: italic;
  font-weight: 340;
  color: var(--gold-ink);
}

.cover-lede {
  font-size: var(--fs-lede);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 34rem;
  margin: 0 0 var(--s8);
}

.cover-lede strong {
  color: var(--ink);
  font-weight: 600;
}

.cover-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s6);
}

/* marginalia column */
.marginalia {
  border-left: 1px solid var(--hair);
  padding-left: var(--s4);
  display: grid;
  gap: var(--s4);
  align-self: stretch;
  align-content: end;
}

.margin-title {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 var(--s1, 2px);
}

.margin-data {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.margin-live,
.doc-live {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #2e7d4f;
  flex: none;
}

/* engraved moon */
.cover-moon {
  position: absolute;
  top: calc(var(--masthead-h) + var(--s6));
  right: max(calc((100% - var(--content)) / 2 + var(--s12)), var(--s6));
  width: clamp(120px, 16vw, 210px);
  pointer-events: none;
}

.moon-svg path,
.moon-svg ellipse {
  vector-effect: non-scaling-stroke;
}

/* ================= section scaffolding ================= */
.theses,
.disciplines,
.route,
.registry-sec {
  padding-block: var(--s24) var(--s12);
  border-bottom: 1px solid var(--hair);
  position: relative;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s6);
  border-bottom: 1px solid var(--hair);
  padding-bottom: var(--s4);
  margin-bottom: var(--s12);
}

.section-head h2 {
  font-size: var(--fs-h2);
  font-weight: 420;
  letter-spacing: -0.01em;
}

.section-note {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0;
  white-space: nowrap;
}

/* ================= 02 · theses ================= */
.thesis-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s12) var(--s16);
}

.thesis {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s4);
  align-items: start;
  border-top: 1px solid var(--hair);
  padding-top: var(--s4);
}

.thesis-no {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-ink);
  padding-top: 6px; /* optical align with serif cap-height */
}

.thesis h3 {
  font-size: var(--fs-h3);
  font-weight: 480;
  margin-bottom: var(--s2);
}

.thesis p {
  color: var(--ink-soft);
  margin: 0;
  max-width: 36rem;
}

/* ================= 03 · disciplines ledger ================= */
.ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.ledger li {
  border-bottom: 1px solid var(--hair);
}

.ledger a {
  display: grid;
  grid-template-columns: 56px 48px minmax(12rem, 0.9fr) 1.4fr auto;
  gap: var(--s6);
  align-items: center;
  padding: var(--s6) var(--s2);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.ledger a:hover {
  background: var(--paper-2);
  padding-left: var(--s4);
}

.ledger-no {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.ledger-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--ink);
}

.ledger-icon svg {
  width: 28px;
  height: 28px;
}

.ledger a:hover .ledger-icon {
  color: var(--gold-ink);
}

.ledger-name {
  font-family: var(--serif);
  font-size: var(--fs-h3);
  font-weight: 480;
  line-height: 1.15;
}

.ledger-desc {
  color: var(--ink-soft);
  max-width: 30rem;
}

.ledger-arrow {
  font-family: var(--mono);
  font-size: 1.25rem;
  color: var(--ink-soft);
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.ledger a:hover .ledger-arrow {
  transform: translateX(6px);
  color: var(--gold-ink);
}

/* ================= 04 · route / star chart ================= */
.route {
  background:
    radial-gradient(rgba(22, 20, 31, 0.05) 1px, transparent 1.4px);
  background-size: 28px 28px;
}

.star-chart {
  margin: 0;
}

.chart-svg {
  width: 100%;
  height: auto;
}

.chart-svg path,
.chart-svg circle {
  vector-effect: non-scaling-stroke;
}

.chart-line {
  stroke-dasharray: 1 10;
}

/* the line draws itself when revealed */
.chart-line {
  stroke-dashoffset: 0;
}

.star-chart.is-drawn .chart-line {
  animation: chartdraw 2.4s var(--ease) both;
}

@keyframes chartdraw {
  from { stroke-dashoffset: 12; }
  to { stroke-dashoffset: 0; }
}

/* nodes fade in sequence — opacity only, never transform
   (a CSS transform on the <g> would clobber its translate attribute) */
.star-chart.is-drawn .chart-node {
  animation: nodepop 500ms var(--ease) backwards;
}

.star-chart.is-drawn .chart-node:nth-of-type(2) { animation-delay: 300ms; }
.star-chart.is-drawn .chart-node:nth-of-type(3) { animation-delay: 900ms; }
.star-chart.is-drawn .chart-node:nth-of-type(4) { animation-delay: 1500ms; }

@keyframes nodepop {
  from { opacity: 0; }
  to { opacity: 1; }
}

.chart-legend {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s6);
  margin-top: var(--s8);
}

.chart-step {
  text-align: center;
  max-width: 15rem;
  margin-inline: auto;
}

.step-no {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-ink);
}

.chart-step h3 {
  font-size: var(--fs-h3);
  font-weight: 480;
  margin: var(--s1, 4px) 0 var(--s2);
}

.chart-step p {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ================= 05 · registry document ================= */
.registry-grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: var(--s16);
  align-items: start;
}

.registry-copy h2 {
  font-size: var(--fs-h2);
  font-weight: 420;
  letter-spacing: -0.01em;
  margin-bottom: var(--s4);
}

.registry-copy p {
  color: var(--ink-soft);
  max-width: 26rem;
  margin: 0;
}

.document {
  position: relative;
  border: 1px solid var(--hair);
  background: var(--paper);
  box-shadow: 0 1px 0 var(--hair-soft), 0 32px 64px -40px rgba(22, 20, 31, 0.4);
}

/* print crop marks */
.crop {
  position: absolute;
  width: 14px;
  height: 14px;
  border-color: var(--ink);
  border-style: solid;
  border-width: 0;
}

.crop.tl { top: -7px; left: -7px; border-top-width: 1.5px; border-left-width: 1.5px; }
.crop.tr { top: -7px; right: -7px; border-top-width: 1.5px; border-right-width: 1.5px; }
.crop.bl { bottom: -7px; left: -7px; border-bottom-width: 1.5px; border-left-width: 1.5px; }
.crop.br { bottom: -7px; right: -7px; border-bottom-width: 1.5px; border-right-width: 1.5px; }

.doc-head {
  display: flex;
  justify-content: space-between;
  gap: var(--s4);
  padding: var(--s3) var(--s6);
  border-bottom: 1px solid var(--hair);
  background: var(--paper-2);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.document dl {
  margin: 0;
  padding: var(--s6);
  display: grid;
  grid-template-columns: minmax(9rem, auto) 1fr;
  column-gap: var(--s8);
  row-gap: var(--s4);
  align-items: baseline;
}

.document dt {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.document dd {
  margin: 0;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.doc-num {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: 0.28em;
}

.doc-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--s6);
  padding: var(--s4) var(--s6) var(--s6);
  border-top: 1px solid var(--hair);
  background: var(--paper-2);
}

/* specimen barcode — decorative, aria-hidden in HTML */
.barcode {
  width: 128px;
  height: 30px;
  background:
    repeating-linear-gradient(90deg,
      var(--ink) 0 2px, transparent 2px 5px,
      var(--ink) 5px 6px, transparent 6px 10px,
      var(--ink) 10px 13px, transparent 13px 15px),
    repeating-linear-gradient(90deg,
      var(--ink) 0 1px, transparent 1px 7px);
}

.doc-source {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 26rem;
  text-align: right;
}

/* ================= 06 · night pages ================= */
.night {
  position: relative;
  background:
    radial-gradient(900px 420px at 80% 115%, rgba(224, 178, 62, 0.07), transparent 60%),
    var(--night);
  color: var(--night-fg);
  padding-block: var(--s24) var(--s12);
}

.night-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--s16);
  align-items: center;
}

.kicker-night {
  color: var(--night-muted);
}

.kicker-night .kicker-star {
  color: var(--gold-l);
}

.night h2 {
  font-size: var(--fs-h2);
  font-weight: 380;
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin-bottom: var(--s6);
}

.night h2 em {
  font-style: italic;
  color: var(--gold-l);
}

.night-lede {
  color: var(--night-muted);
  font-size: var(--fs-lede);
  line-height: 1.5;
  max-width: 30rem;
  margin: 0 0 var(--s8);
}

.mail {
  font-family: var(--serif);
  font-style: italic;
  font-optical-sizing: auto;
  font-size: var(--fs-h3);
  color: var(--night-fg);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-l);
  padding-bottom: 2px;
  transition: color var(--t-fast) var(--ease);
}

.mail:hover {
  color: var(--gold-l);
}

.night-addr {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  line-height: 2;
  color: var(--night-muted);
  margin: var(--s6) 0 0;
}

.scene-svg path,
.scene-svg rect {
  vector-effect: non-scaling-stroke;
}

.night-scene .scene-svg {
  width: min(100%, 360px);
  margin-inline: auto;
}

.folio-night {
  color: var(--night-muted);
}

.folio-night::before {
  border-top-color: var(--hair-night);
}

/* ================= colophon ================= */
.colophon {
  background: var(--night);
  color: var(--night-muted);
  border-top: 1px solid var(--hair-night);
  padding-block: var(--s12);
  font-size: 0.9rem;
}

.colophon-grid {
  display: grid;
  grid-template-columns: 1.2fr auto 1.2fr;
  gap: var(--s12);
  align-items: start;
}

.colophon .wordmark {
  color: var(--night-fg);
}

.colophon-note {
  margin: var(--s4) 0 0;
  max-width: 22rem;
  line-height: 1.7;
}

.colophon-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--s2);
}

.colophon-nav a {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.colophon-nav a:hover {
  color: var(--night-fg);
}

.colophon-legal {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  line-height: 2;
  margin: 0;
  text-align: right;
}

/* ================= illustration motion ================= */
@media (prefers-reduced-motion: no-preference) {
  .float {
    animation: float 7s ease-in-out infinite alternate;
  }

  @keyframes float {
    from { transform: translateY(0); }
    to { transform: translateY(-12px); }
  }

  .twinkle {
    animation: twinkle 4.5s ease-in-out infinite;
  }

  .twinkle-late {
    animation-delay: 2.2s;
  }

  @keyframes twinkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
  }
}

/* ================= reveal on scroll ================= */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ================= reduced motion ================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .float,
  .twinkle,
  .star-chart.is-drawn .chart-line,
  .star-chart.is-drawn .chart-node {
    animation: none;
  }

  .chart-node {
    opacity: 1;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .ledger a,
  .ledger-arrow,
  .link-ink,
  .mail,
  .mast-nav a,
  .mast-cta {
    transition: none;
  }
}

/* ================= responsive ================= */
@media (max-width: 1100px) {
  .spine {
    display: none;
  }
}

@media (max-width: 960px) {
  .cover-grid {
    grid-template-columns: 1fr;
    gap: var(--s12);
  }

  .marginalia {
    border-left: 0;
    border-top: 1px solid var(--hair);
    padding-left: 0;
    padding-top: var(--s6);
    grid-template-columns: repeat(2, 1fr);
    align-content: start;
  }

  .cover-moon {
    width: 128px;
    right: var(--s4);
    top: calc(var(--masthead-h) + var(--s4));
    opacity: 0.85;
  }

  .thesis-list {
    grid-template-columns: 1fr;
    gap: var(--s8);
  }

  .ledger a {
    grid-template-columns: 48px 1fr auto;
  }

  .ledger-no,
  .ledger-desc {
    display: none;
  }

  .chart-legend {
    grid-template-columns: 1fr 1fr;
    gap: var(--s8) var(--s6);
  }

  .chart-step {
    text-align: left;
    margin-inline: 0;
  }

  .registry-grid,
  .night-grid {
    grid-template-columns: 1fr;
    gap: var(--s12);
  }

  .night-scene {
    display: none;
  }

  .colophon-grid {
    grid-template-columns: 1fr;
    gap: var(--s8);
  }

  .colophon-legal {
    text-align: left;
  }
}

@media (max-width: 640px) {
  :root {
    --masthead-h: 56px;
  }

  .nav-toggle {
    display: inline-block;
    margin-left: auto;
  }

  .mast-cta {
    display: none;
  }

  .mast-nav {
    position: fixed;
    inset-inline: 0;
    top: var(--masthead-h);
    margin-left: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--hair);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease),
      visibility 0s linear var(--t-fast);
  }

  .mast-nav.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
  }

  .mast-nav ul {
    flex-direction: column;
    gap: 0;
    padding: var(--s2) var(--gutter) var(--s6);
  }

  .mast-nav a {
    display: block;
    padding: var(--s3) 0;
    font-size: var(--fs-mono);
    border-bottom: 1px solid var(--hair-soft);
  }

  .mast-nav li:last-child a {
    border-bottom: 0;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s2);
  }

  .folio {
    text-align: left;
  }

  .folio::before {
    margin-left: 0;
  }

  .document dl {
    grid-template-columns: 1fr;
    row-gap: 0;
  }

  .document dt {
    padding-top: var(--s4);
  }

  .document dd {
    border-top: 1px dashed var(--hair);
    padding-top: var(--s2);
  }

  .doc-foot {
    flex-direction: column;
    align-items: flex-start;
  }

  .doc-source {
    text-align: left;
  }
}