/* ==========================================================================
   Kantetsu — Systems Atlas Project
   Paper, ink, one clay accent. Nothing else.
   ========================================================================== */

:root {
  /* Palette */
  --paper:      #F1EBE1;
  --paper-sunk: #E7DFD1;
  --rule:       #D3C8B6;
  --ink:        #191612;
  --ink-soft:   #6D6558;
  --ink-faint:  #9A9184;
  --clay:       #A2482C;
  --clay-soft:  #C98E7A;

  /* Type */
  --serif: ui-serif, "New York", "Iowan Old Style", "Palatino Linotype",
           Palatino, "Book Antiqua", Georgia, serif;
  --mono:  ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas,
           "Liberation Mono", monospace;

  /* Measure */
  --measure: 34rem;
  --wide: 62rem;
  --gutter: clamp(1.25rem, 5vw, 3rem);
}

/* Reset ------------------------------------------------------------------ */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1rem, 0.97rem + 0.15vw, 1.09rem);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p, ul, ol, figure, dl { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }

a { color: inherit; }

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

/* Shared layout ---------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.band { padding-block: clamp(3.5rem, 8vw, 6rem); }
.band--tight { padding-block: clamp(2.5rem, 5vw, 3.5rem); }
.band--sunk { background: var(--paper-sunk); }

/* Type roles ------------------------------------------------------------- */

.label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.4rem;
}

.label--clay { color: var(--clay); }

.display {
  font-size: clamp(2.4rem, 1.4rem + 4.4vw, 4.3rem);
  line-height: 1.04;
  letter-spacing: -0.022em;
  font-weight: 400;
  text-wrap: balance;
}

.h2 {
  font-size: clamp(1.55rem, 1.2rem + 1.4vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin: 0 0 1.1rem;
  text-wrap: balance;
}

.h3 {
  font-size: 1.13rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 0 0 0.4rem;
}

.lede {
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.32rem);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 32rem;
}

.prose p + p { margin-top: 1rem; }
.prose { color: var(--ink-soft); }
.prose strong { color: var(--ink); font-weight: 600; }

.kanji {
  font-size: 1.02em;
  letter-spacing: 0.06em;
}

/* Divider: the thread motif, reduced to a rule and a node ----------------- */

.thread-rule {
  position: relative;
  height: 1px;
  background: var(--rule);
  border: 0;
  margin: 0;
}

.thread-rule::after {
  content: "";
  position: absolute;
  top: 50%;
  left: max(var(--gutter), calc(50% - (var(--wide) / 2) + var(--gutter)));
  width: 7px;
  height: 7px;
  background: var(--paper);
  border: 1px solid var(--ink-faint);
  transform: translate(-50%, -50%) rotate(45deg);
}

.thread-rule--sunk::after { background: var(--paper-sunk); }

/* Masthead --------------------------------------------------------------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem 1.5rem;
  padding-block: 1.6rem;
}

.masthead__mark {
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}

.masthead__mark span { color: var(--clay); }

.masthead__origin {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-decoration: none;
}

.masthead__origin:hover { color: var(--ink); }

/* Hero ------------------------------------------------------------------- */

.hero { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 4vw, 3rem); }

.hero__display { margin-bottom: 1.4rem; max-width: 22ch; }

.hero__display em {
  font-style: normal;
  color: var(--clay);
}

.hero__meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 2rem;
}

/* Signature: the thread -------------------------------------------------- */

.thread {
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

/* Below ~660px the strip would compress to specks, so it scrolls instead. */
.thread__scroll {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  padding-block: 0.5rem;
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
}

.thread__scroll::-webkit-scrollbar { display: none; }

.thread__svg {
  width: 100%;
  min-width: 40rem;
  height: auto;
  overflow: visible;
}

@media (min-width: 46rem) {
  .thread__scroll {
    overflow: visible;
    margin-inline: 0;
    padding-inline: 0;
  }
  .thread__svg { min-width: 0; }
}

.thread__line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.25;
}

.thread__node {
  fill: var(--ink);
}

.thread__node--off {
  fill: none;
  stroke: var(--ink-faint);
  stroke-width: 1;
}

.thread__node--today {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1;
  stroke-dasharray: 2 2;
}

.thread__cut {
  stroke: var(--clay);
  stroke-width: 1.25;
}

.thread__cut-node {
  fill: none;
  stroke: var(--clay);
  stroke-width: 1.25;
}

.thread__tick { stroke: var(--rule); stroke-width: 1; }

.thread__caption {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--ink-faint);
}

.thread__caption--clay { fill: var(--clay); }

.thread__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-top: 1.6rem;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.thread__legend li { display: flex; align-items: center; gap: 0.5rem; }

.swatch {
  width: 8px;
  height: 8px;
  flex: none;
}

.swatch--kept { background: var(--ink); }
.swatch--broken { border: 1.25px solid var(--clay); }
.swatch--off { border: 1px solid var(--ink-faint); border-radius: 50%; }
.swatch--today { border: 1px dashed var(--ink); }

/* Loop ------------------------------------------------------------------- */

.loop {
  display: grid;
  gap: 2.2rem;
  grid-template-columns: 1fr;
  margin-top: 2.6rem;
}

.loop__item { max-width: 28rem; }

.loop__step {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clay);
  display: block;
  margin-bottom: 0.55rem;
}

.loop__item p { color: var(--ink-soft); font-size: 0.98rem; }

@media (min-width: 46rem) {
  .loop { grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
}

/* Thesis ----------------------------------------------------------------- */

.thesis__quote {
  font-size: clamp(1.5rem, 1.1rem + 1.7vw, 2.3rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  max-width: 20ch;
  margin: 0 0 1.6rem;
}

.thesis__quote em { font-style: normal; color: var(--clay); }

/* Feature list ----------------------------------------------------------- */

.features {
  margin-top: 2.5rem;
  border-top: 1px solid var(--rule);
}

.feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem 2.5rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.feature__body { color: var(--ink-soft); font-size: 0.99rem; max-width: 40rem; }

.feature__note {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clay);
  margin-top: 0.5rem;
}

@media (min-width: 46rem) {
  .feature { grid-template-columns: 13rem 1fr; align-items: baseline; }
  .feature .h3 { margin: 0; }
}

/* Absent list ------------------------------------------------------------ */

.absent {
  display: grid;
  gap: 0.9rem 2.5rem;
  margin-top: 2rem;
  grid-template-columns: 1fr;
}

.absent li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  color: var(--ink-soft);
  font-size: 0.99rem;
}

.absent li::before {
  content: "—";
  color: var(--clay);
  flex: none;
}

@media (min-width: 40rem) {
  .absent { grid-template-columns: 1fr 1fr; }
}

/* Name section ----------------------------------------------------------- */

.glyphs {
  display: flex;
  gap: 1.5rem;
  margin: 0 0 2rem;
  align-items: stretch;
}

.glyph {
  border: 1px solid var(--rule);
  padding: 1rem 1.1rem 0.9rem;
  min-width: 7.5rem;
  background: var(--paper);
}

.glyph__char {
  font-size: 2.6rem;
  line-height: 1;
  margin-bottom: 0.6rem;
  display: block;
}

.glyph__gloss {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
  line-height: 1.5;
}

.family {
  margin-top: 2.5rem;
  border-top: 1px solid var(--rule);
}

.family__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem 1.5rem;
  padding-block: 1.05rem;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  text-decoration: none;
}

.family__name { font-size: 1.05rem; }
.family__name .kanji { color: var(--ink-faint); margin-left: 0.5rem; font-size: 0.9em; }

.family__gloss { color: var(--ink-soft); font-size: 0.95rem; }

.family__link {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

a.family__row:hover .family__link { color: var(--clay); }
a.family__row:hover .family__name { color: var(--clay); }

@media (min-width: 46rem) {
  .family__row { grid-template-columns: 11rem 1fr auto; }
}

/* Call to action --------------------------------------------------------- */

.cta__status {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--clay);
  border: 1px solid var(--clay-soft);
  padding: 0.5rem 0.85rem;
  margin-bottom: 1.6rem;
}

.cta__platforms {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1.5rem;
}

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
}

.btn:hover { background: var(--clay); border-color: var(--clay); }

/* Footer ----------------------------------------------------------------- */

.footer {
  border-top: 1px solid var(--rule);
  padding-block: 2.5rem 3.5rem;
  margin-top: 1rem;
}

.footer__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  justify-content: space-between;
  align-items: baseline;
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer__nav a,
.footer__colophon a {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-decoration: none;
}

.footer__nav a:hover,
.footer__colophon a:hover { color: var(--clay); }

.footer__colophon {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* Document pages (privacy, support) -------------------------------------- */

.doc { padding-block: clamp(2rem, 5vw, 3.5rem) 4rem; }

.doc .measure { max-width: 38rem; }

.doc h2 {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2.6rem 0 0.7rem;
}

.doc h2:first-of-type { margin-top: 2rem; }

.doc p { color: var(--ink-soft); margin-bottom: 0.9rem; }

.doc ul {
  list-style: none;
  margin: 0 0 1.2rem;
}

.doc ul li {
  color: var(--ink-soft);
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.doc ul li::before { content: "—"; color: var(--clay); flex: none; }

.doc a { color: var(--clay); text-underline-offset: 3px; }

.doc__updated {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.6rem;
}

/* Motion ----------------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .thread__draw {
    stroke-dasharray: var(--len);
    stroke-dashoffset: var(--len);
    animation: draw 1.1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    animation-delay: var(--delay, 0s);
  }

  .thread__fade {
    opacity: 0;
    animation: fade 0.4s ease forwards;
    animation-delay: var(--delay, 0s);
  }
}

/* Orchestration for the hero thread. Kept here, not inline, so the page
   works under a Content-Security-Policy without 'unsafe-inline'. */
.t-run1   { --len: 432; --delay: 0.15s; }
.t-run2   { --len: 372; --delay: 1.05s; }
.t-tail   { --delay: 2s; }
.t-nodes1 { --delay: 0.5s; }
.t-cut    { --delay: 0.95s; }
.t-nodes2 { --delay: 1.4s; }
.t-today  { --delay: 2s; }
.t-caps   { --delay: 2.2s; }

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }

/* Print ------------------------------------------------------------------ */

@media print {
  .thread, .cta { display: none; }
  body { background: #fff; }
}