@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("./fonts/ibm-plex-sans-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("./fonts/ibm-plex-sans-500.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 600; font-display: swap; src: url("./fonts/ibm-plex-sans-600.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("./fonts/ibm-plex-mono-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("./fonts/ibm-plex-mono-500.woff2") format("woff2"); }

/* ---------- tokens ---------- */
:root {
  --paper: #f7f5f1;
  --card: #fffefc;
  --ink: #191612;
  --muted: #57503f;
  --faint: #8b8172;
  --line: #e3ded5;
  --shade: #efece6;
  --desk: #e9e5dd;
  --accent: #0d7797;
  --accent-soft: #e0f0f5;
  --accent2: #ba3d78;
  --grid: rgba(25, 22, 18, 0.05);
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17140f;
    --card: #1e1a14;
    --ink: #e9e3d7;
    --muted: #ab9f8a;
    --faint: #7b7260;
    --line: #322c22;
    --shade: #201c15;
    --desk: #110e0a;
    --accent: #5cadc8;
    --accent-soft: #0e2f3a;
    --accent2: #d17ea8;
    --grid: rgba(233, 227, 215, 0.045);
  }
}
:root[data-theme="light"] {
  --paper: #f7f5f1; --card: #fffefc; --ink: #191612; --muted: #57503f;
  --faint: #8b8172; --line: #e3ded5; --shade: #efece6; --desk: #e9e5dd;
  --accent: #0d7797; --accent-soft: #e0f0f5; --accent2: #ba3d78;
  --grid: rgba(25, 22, 18, 0.05);
}
:root[data-theme="dark"] {
  --paper: #17140f; --card: #1e1a14; --ink: #e9e3d7; --muted: #ab9f8a;
  --faint: #7b7260; --line: #322c22; --shade: #201c15; --desk: #110e0a;
  --accent: #5cadc8; --accent-soft: #0e2f3a; --accent2: #d17ea8;
  --grid: rgba(233, 227, 215, 0.045);
}

/* ---------- base ---------- */
html { scroll-behavior: smooth; }
body {
  background: var(--desk);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "tnum";
}
a { color: inherit; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
h1, h2, h3 { text-wrap: balance; margin: 0; }
p { margin: 0; }
figure { margin: 0; }

.k {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- the sheet ---------- */
.sheet {
  position: relative;
  max-width: 1140px;
  margin: clamp(16px, 4vw, 48px) auto;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px, 32px 32px, auto;
  border: 1.5px solid var(--ink);
}
@media (max-width: 1188px) {
  .sheet { margin-left: 16px; margin-right: 16px; }
}

/* registration crosshairs on the sheet corners */
.reg { position: absolute; width: 22px; height: 22px; pointer-events: none; }
.reg::before, .reg::after { content: ""; position: absolute; background: var(--ink); }
.reg::before { left: 50%; top: 0; width: 1px; height: 100%; }
.reg::after { top: 50%; left: 0; height: 1px; width: 100%; }
.reg.tl { top: -12px; left: -12px; }
.reg.tr { top: -12px; right: -11px; }
.reg.bl { bottom: -11px; left: -12px; }
.reg.br { bottom: -11px; right: -11px; }

/* ---------- header ---------- */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(20px, 4vw, 36px);
  border-bottom: 1.5px solid var(--ink);
  background: var(--paper);
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 19px;
  letter-spacing: 0.01em;
}
.wordmark svg { display: block; }
.idx { display: flex; gap: clamp(14px, 3vw, 28px); }
.idx a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.idx a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- sections ---------- */
section { padding: clamp(44px, 7vw, 72px) clamp(20px, 4vw, 36px); scroll-margin-top: 16px; }
section + section { border-top: 1.5px solid var(--ink); }

.sec-head { margin-bottom: clamp(28px, 4vw, 44px); }
.sec-kicker {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}
.sec-kicker .no {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.14em;
}
.sec-kicker .rule { flex: 1; height: 1px; background: var(--line); }
.sec-kicker .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.sec-head h2 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 600; letter-spacing: -0.01em; }
.sec-lead { max-width: 62ch; margin-top: 12px; color: var(--muted); font-size: 16.5px; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 54px);
  line-height: 1.06;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.hero .lead {
  margin-top: 22px;
  max-width: 56ch;
  color: var(--muted);
  font-size: 17px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 22px;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  background: transparent;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.solid { background: var(--ink); color: var(--paper); }
.btn.solid:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
:root[data-theme="dark"] .btn.solid:hover, .btn.solid:hover { color: var(--paper); }

.defcard {
  margin-top: 36px;
  max-width: 54ch;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--card);
  font-size: 14.5px;
  color: var(--muted);
}
.defcard .term { font-family: var(--mono); font-weight: 500; color: var(--ink); }
.defcard .gram { font-style: italic; color: var(--faint); }
.defcard .ipa { font-family: var(--mono); color: var(--faint); }

.epigraph {
  margin: 64px auto 0;
  max-width: 56ch;
  text-align: center;
}
.epigraph p {
  font-size: 18.5px;
  line-height: 1.6;
  font-style: italic;
  color: var(--muted);
}
.epigraph cite {
  display: block;
  margin-top: 12px;
  font-style: normal;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--faint);
}

.arrival {
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
}
.arrival code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--ink);
}
.arrival a { color: var(--accent); text-underline-offset: 3px; }
.arrival a code { color: inherit; }
.arrival a:hover { text-decoration-thickness: 2px; }

.hero-fig { position: relative; }
.hero-fig svg { display: block; width: 100%; height: auto; color: var(--ink); }
.hero-fig figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  text-align: center;
}

/* drawn-in strokes */
.draw {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: drawin 0.9s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  animation-delay: calc(var(--d, 0) * 1s);
}
.fadein {
  opacity: 0;
  animation: fadein 0.5s ease-out forwards;
  animation-delay: calc(var(--d, 0) * 1s);
}
@keyframes drawin { to { stroke-dashoffset: 0; } }
@keyframes fadein { to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .draw { animation: none; stroke-dashoffset: 0; }
  .fadein { animation: none; opacity: 1; }
}

/* ---------- principles ---------- */
.grid4 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.pcard {
  position: relative;
  padding: 26px 26px 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.pcard:hover { background: var(--card); }
.pcard .pid {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.pcard .picon { margin: 18px 0 14px; color: var(--muted); }
.pcard:hover .picon { color: var(--accent); }
.pcard h3 { font-size: 17.5px; font-weight: 600; margin-bottom: 8px; }
.pcard p { font-size: 14.5px; color: var(--muted); max-width: 46ch; }
.pcard code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--shade);
  padding: 1px 5px;
  border: 1px solid var(--line);
}

/* ---------- the window ---------- */
.plumb { position: relative; max-width: 820px; }
.station {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 8px 18px;
  padding: 22px 0;
  align-items: start;
}
.st-no {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--faint);
  position: relative;
  padding-top: 2px;
}
.st-no::after {
  content: "";
  position: absolute;
  top: 9px;
  right: -4px;
  width: 22px;
  height: 1px;
  background: var(--line);
}
.station h3 { font-size: 17.5px; font-weight: 600; margin-bottom: 6px; }
.station p { font-size: 14.5px; color: var(--muted); max-width: 58ch; }
.actor {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--card);
  padding: 4px 8px;
  white-space: nowrap;
  margin-top: 2px;
}
.actor.ai { color: var(--accent2); border-color: var(--accent2); }

.winbox {
  border: 2px solid var(--ink);
  background: var(--card);
  margin: 8px 0;
}
.winbox .station { padding: 22px 24px; }
.winbox .station + .station { border-top: 1px solid var(--line); }
.win-edge {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding: 13px 24px;
  background: var(--ink);
  color: var(--paper);
}
.win-edge .st-no { color: var(--paper); opacity: 0.65; padding-top: 0; }
.win-edge .st-no::after { display: none; }
.win-edge .t {
  font-weight: 600;
  font-size: 15.5px;
  letter-spacing: 0.01em;
}
.win-edge .note {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  opacity: 0.65;
  margin-left: auto;
}

/* ---------- scope note ---------- */
.sec-note { padding-top: clamp(32px, 5vw, 48px); padding-bottom: clamp(32px, 5vw, 48px); }
.sec-note .sec-head { margin-bottom: 18px; }
.sec-note h2 { font-size: clamp(18px, 2.4vw, 21px); }
.bounds { max-width: 62ch; }
.bounds p { font-size: 14.5px; color: var(--muted); }
.bounds p + p { margin-top: 14px; }
.bound-list { list-style: none; margin: 16px 0; padding: 0; }
.bound-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 9px 0;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--muted);
}
.bound-list li:last-child { border-bottom: 1px solid var(--line); }
.bound-list .actor { min-width: 104px; text-align: center; margin-top: 0; }

/* ---------- projects ---------- */
.tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.tool {
  position: relative;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.tool:hover { background: var(--card); }
.tool-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
}
.tool-head .sheetno {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--faint);
}
.tool-head .role {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid currentColor;
  padding: 3px 8px;
}
.tool-body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.tool-body h3 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}
.tool-body > p { font-size: 14.5px; color: var(--muted); margin-bottom: 40px; }
p.tool-def {
  font-size: 12.5px;
  color: var(--faint);
  margin: -4px 0 14px;
}
.tool-def .term { font-family: var(--mono); font-weight: 500; color: var(--muted); }
.tool-def .ipa { font-family: var(--mono); }
.tool-def .gram { font-style: italic; }
.spec { margin-top: auto; padding-top: 18px; border-top: 1px solid var(--line); }
.spec li {
  list-style: none;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.spec { padding: 0; margin-left: 0; margin-bottom: 0; }
.tool-link {
  display: block;
  padding: 14px 22px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
}
/* the link covers the whole card, so any part of it is clickable */
.tool-link::after { content: ""; position: absolute; inset: 0; }
.tool:hover .tool-link { color: var(--accent); }
.tool-link:focus-visible { outline: none; }
.tool-link:focus-visible::after { outline: 2px solid var(--accent); outline-offset: -3px; }
.tool-link .arrow { color: var(--accent); }

/* ---------- the agreement ---------- */
.ag-head { margin-bottom: clamp(28px, 4vw, 40px); }
.ag-lead { max-width: 62ch; color: var(--muted); font-size: 16.5px; }
.ag-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.ag-actions .arrow { display: inline-block; }

/* the file itself, framed as a sheet */
.doc {
  max-width: 74ch;
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--line);
  background: var(--card);
}
.doc h1 { font-size: clamp(26px, 3.6vw, 34px); font-weight: 600; letter-spacing: -0.015em; }
.doc h2 {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 18px;
  font-weight: 600;
}
.doc p { margin-top: 14px; color: var(--muted); }
.doc ol, .doc ul { margin: 14px 0 0; padding-left: 24px; color: var(--muted); }
.doc li { margin-top: 12px; }
.doc li p { margin-top: 0; }
.doc li p + p { margin-top: 10px; }
.doc li::marker { font-family: var(--mono); color: var(--accent); }
.doc strong { color: var(--ink); font-weight: 600; }
.doc code { font-family: var(--mono); font-size: 0.92em; color: var(--ink); }
.doc a { color: var(--accent); text-underline-offset: 3px; }

/* ---------- title block ---------- */
.titleblock { border-top: 2px solid var(--ink); background: var(--paper); }
.tb-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
}
.tb-row.crew { grid-template-columns: 1fr 1fr 1fr 2fr; border-top: 1px solid var(--line); }
.tb-cell { padding: 12px 18px; border-right: 1px solid var(--line); min-width: 0; }
.tb-cell:last-child { border-right: none; }
.tb-cell .lbl {
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 3px;
}
.tb-cell .val { font-family: var(--mono); font-size: 12.5px; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-cell .val a { text-decoration: none; color: var(--accent); }
.tb-cell .val a:hover { text-decoration: underline; }

/* ---------- responsive ---------- */
@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; }
  .hero-fig { max-width: 520px; margin: 0 auto; }
  .tools { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .grid4 { grid-template-columns: 1fr; }
  .station { grid-template-columns: 44px minmax(0, 1fr); }
  .station .actor { grid-column: 2; justify-self: start; }
  .win-edge .note { margin-left: 0; width: 100%; }
  .tb-row, .tb-row.crew { grid-template-columns: 1fr 1fr; }
  .tb-cell { border-bottom: 1px solid var(--line); }
  .idx a:not(:last-child) { display: none; }
}