@font-face {
  font-family: "Instrument Serif";
  src: url("../fonts/InstrumentSerif-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Serif";
  src: url("../fonts/InstrumentSerif-Italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Noto Serif SC";
  src: url("../fonts/NotoSerifSC.woff2") format("woff2");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #120e18;
  --ink-2: #140c12;
  --cream: #f4ecdf;
  --cream-dim: rgba(244, 236, 223, 0.78);
  --red: #ff3355;
  --peach: #f0b59a;
  --line: rgba(244, 236, 223, 0.2);
  --display: "Instrument Serif", "Noto Serif SC", "Songti SC", "WenQuanYi Micro Hei", serif;
  --text: "Instrument Serif", "Noto Serif SC", "Songti SC", "WenQuanYi Micro Hei", serif;
  --mono: ui-monospace, "WenQuanYi Micro Hei Mono", "Sarasa Mono SC", monospace;
  --pad: clamp(16px, 3vw, 40px);
  --spine: 48px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--text);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
button, a { font: inherit; }
::selection { background: var(--red); color: #fff; }
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--cream);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  background: var(--cream);
  color: var(--ink);
  padding: 8px 12px;
  z-index: 5;
}
.skip:focus { top: 12px; }

.spine {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--spine);
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  letter-spacing: 0.42em;
  font-size: 13px;
  border-right: 1px solid var(--line);
}
.spine-mobile { display: none; margin: 0 0 10px; letter-spacing: 0.28em; font-size: 12px; }

.top, .foot { margin-left: var(--spine); }
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px var(--pad) 0;
}
.mark {
  font-family: var(--display);
  font-style: italic;
  font-size: 28px;
  line-height: 1;
  color: var(--cream);
  text-decoration: none;
}
.home-link {
  color: var(--cream);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.02em;
  border: 1px solid var(--line);
  padding: 7px 12px;
}
.home-link:hover { border-color: var(--cream); }

main { margin-left: var(--spine); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 28px 36px;
  align-items: start;
  padding: 28px var(--pad) 42px;
}
.kicker {
  margin: 0 0 12px;
  letter-spacing: 0.22em;
  font-size: 13px;
}
h1 {
  margin: 0;
  font-size: clamp(52px, 6.6vw, 104px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.045em;
}
h1 em { font-style: normal; color: var(--red); }
.latin {
  margin: 14px 0 0;
  font-family: var(--display);
  font-style: italic;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1;
}
.lede, .prose {
  max-width: 38em;
  margin: 18px 0 0;
}
.fine {
  margin: 14px 0 0;
  color: var(--cream-dim);
  font-size: 14px;
  max-width: 40em;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 0; }
.go, .repo, .actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  color: var(--cream);
}
.go { background: var(--red); color: var(--ink-2); }
.repo, .actions button { border-color: var(--line); }
.go:hover { background: #ff4b68; }
.repo:hover, .actions button:hover, .deck button:hover { border-color: var(--cream); }
figure { margin: 0; }
figcaption {
  margin-top: 10px;
  color: rgba(244, 236, 223, 0.9);
  font-size: 15px;
  line-height: 1.5;
  max-width: 62em;
}

.horizon { background: var(--peach); color: var(--ink-2); }
.horizon-label {
  margin: 0;
  padding: 16px var(--pad) 0;
  letter-spacing: 0.2em;
  font-size: 13px;
}
.cells { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.cells div {
  padding: 14px var(--pad) 22px 16px;
  border-left: 1px solid rgba(20, 12, 18, 0.16);
}
.cells div:first-child { border-left: 0; padding-left: var(--pad); }
.cells b {
  display: block;
  font-family: var(--display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(44px, 5vw, 76px);
  line-height: 0.9;
  letter-spacing: -0.03em;
}
.cells span { display: block; margin-top: 8px; font-size: 16px; }
.cells small { display: block; margin-top: 4px; font-size: 13px; line-height: 1.4; }

.block { padding: 72px var(--pad); }
.block + .block { border-top: 1px solid var(--line); }
h2 {
  margin: 0;
  font-size: clamp(36px, 4vw, 56px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
}
.plate { margin-top: 28px; }
.quiet { color: var(--cream-dim); font-size: 16px; }

.road {
  margin-top: 22px;
  max-width: 720px;
  background: #07060c;
  border: 1px solid var(--line);
  padding: 8px 18px 12px;
}
.road-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-height: 52px;
}
.road-row + .road-row { border-top: 1px dashed rgba(244, 236, 223, 0.35); }
.arrows {
  display: inline-flex;
  gap: 16px;
  align-items: center;
}
.arrows svg { display: block; }
.you-arrow { transform-origin: center; }
.road[data-against="true"] .you-arrow {
  transform: rotate(180deg);
  color: var(--red);
}
.tag { font-size: 13px; letter-spacing: 0.16em; }
.readout {
  min-height: 2.8em;
  margin: 18px 0 0;
  max-width: 40em;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.45;
}

.goals { list-style: none; margin: 28px 0 0; padding: 0; max-width: 760px; }
.goals li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 8px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.goals .n {
  font-family: var(--display);
  font-style: italic;
  font-size: 40px;
  line-height: 1;
  color: var(--peach);
}
.goals h3 { margin: 0; font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.goals p { margin: 6px 0 0; color: var(--cream-dim); }

.deck { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; max-width: 760px; }
.deck button {
  min-width: 84px;
  min-height: 76px;
  padding: 10px 12px 12px;
  text-align: left;
  background: transparent;
  color: var(--cream);
  border: 1px solid var(--line);
  cursor: pointer;
}
.deck button.is-on {
  background: var(--cream);
  color: var(--ink);
  border-color: var(--cream);
}
.deck kbd {
  display: block;
  font-family: var(--display);
  font-style: italic;
  font-size: 26px;
  line-height: 1;
  font-weight: 400;
}
.deck span { display: block; margin-top: 8px; font-size: 13px; }

.steps { margin: 18px 0 0; padding-left: 1.25em; max-width: 46em; }
.steps li { margin: 0 0 16px; padding-left: 4px; }
.steps a { color: var(--cream); }
pre {
  margin: 12px 0 0;
  padding: 12px 14px;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.55;
}
code { font-family: var(--mono); font-size: 0.92em; }

.foot {
  display: flex;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  padding: 22px var(--pad) 40px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.foot p { margin: 0; }
.foot-links { display: flex; gap: 18px; }
.foot a { color: var(--cream); }

@media (max-width: 900px) {
  .spine { display: none; }
  .spine-mobile { display: block; }
  .top, .foot, main { margin-left: 0; }
  .hero { grid-template-columns: 1fr; padding-top: 22px; }
  .cells { grid-template-columns: 1fr 1fr; }
  .cells div { border-left: 0; border-top: 1px solid rgba(20, 12, 18, 0.16); padding: 16px var(--pad) 18px; }
  .cells div:nth-child(-n+2) { border-top: 0; }
  .block { padding: 56px var(--pad); }
  h1 { letter-spacing: -0.035em; }
}

@media (max-width: 380px) {
  .goals li { grid-template-columns: 64px minmax(0, 1fr); }
  .goals .n { font-size: 32px; }
  .deck button { min-width: calc(50% - 4px); flex: 1 1 calc(50% - 4px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .you-arrow { transition: none; }
  .go:hover { background: var(--red); }
}