:root {
  --paper: #e8edf2;
  --paper-2: #dae2ea;
  --paper-3: #c8d3de;
  --ink: #151b24;
  --ink-2: #3a4757;
  --indigo: #1e2a52;
  --indigo-2: #36477a;
  --steel: #9fb0c4;
  --rope: #c08f4e;
  --rope-ink: #82501c;
  --rule: #aab8c7;
  --hair: #2a3d5a1c;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --gap: clamp(64px, 9vw, 116px);
  --pad: clamp(20px, 5vw, 48px);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--paper);
  background-image: linear-gradient(var(--hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--hair) 1px, transparent 1px);
  background-size: 100% 28px, 28px 100%;
  background-position: -1px -1px;
  color: var(--ink);
  font: 400 clamp(1rem, 0.96rem + 0.2vw, 1.075rem)/1.62 var(--sans);
}

.wrap { max-width: 1180px; margin-inline: auto; padding-inline: var(--pad); }
.wrap.narrow { max-width: 860px; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.012em; margin: 0; }
h1, h2, h3 { text-wrap: balance; }
p { margin: 0 0 1em; }
a { color: var(--indigo); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--rope-ink); }
strong, b { font-weight: 650; }

:focus-visible { outline: 2px solid var(--indigo); outline-offset: 3px; border-radius: 1px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 20; background: var(--indigo); color: var(--paper);
  padding: 12px 18px; font: 600 0.85rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em;
}
.skip:focus { left: 0; }

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}

.sitehead { padding: clamp(24px, 3.4vw, 38px) 16px clamp(16px, 2vw, 22px); text-align: center; }
.brand {
  display: inline-flex; align-items: center; gap: 14px; text-decoration: none; color: var(--indigo);
  font: 600 clamp(1.35rem, 1.1rem + 1vw, 1.85rem)/1 var(--serif); letter-spacing: 0.22em; text-transform: uppercase;
}
.brand span { margin-right: -0.22em; }
.mark { width: 36px; height: 36px; flex: none; }
.mark .a { stroke: var(--indigo); stroke-width: 7; }
.mark .b { stroke: var(--rope); stroke-width: 3.4; }
.tagline {
  margin: 12px 0 0; font: 500 0.72rem/1.4 var(--mono); letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-2);
}
.navrow {
  position: sticky; top: 0; z-index: 10; display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 8px;
  padding: 6px 12px; background: var(--paper); border-block: 1px solid var(--rule); box-shadow: 0 1px 0 var(--paper-3);
}
.navrow a {
  padding: 9px 12px; text-decoration: none; color: var(--ink-2); border: 1px solid transparent;
  font: 500 0.76rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase;
}
.navrow a:hover { color: var(--indigo); border-color: var(--rule); background: var(--paper-2); }

.masthead { padding-block: clamp(36px, 5vw, 68px) var(--gap); }
.mh-grid { display: grid; gap: clamp(28px, 4vw, 56px); align-items: start; }
.secnum, .phint, .qn, .cb, .footline {
  font: 500 0.76rem/1.4 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--rope-ink);
}
h1 { font-size: clamp(2rem, 1.2rem + 3.2vw, 3.3rem); line-height: 1.05; }

#mh { padding: 0 max(0px, calc(100% - 20ch)) 20px 0; border-bottom: 2px solid var(--indigo); }
.lede { margin: 22px 0 0; font-size: clamp(1.05rem, 1rem + 0.35vw, 1.22rem); max-width: 56ch; color: var(--ink-2); }
.caution {
  margin: 0; padding: 14px 16px; border: 1px solid var(--rule); border-left: 4px solid var(--rope);
  background: var(--paper-2); font-size: 0.94rem; max-width: 60ch;
}
.datablock { margin: 0; border-top: 2px solid var(--indigo); }
.datablock > div {
  display: flex; justify-content: space-between; gap: 16px; padding: 11px 0;
  border-bottom: 1px solid var(--rule);
}
.datablock dt {
  font: 500 0.74rem/1.5 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2);
}
.datablock dd { margin: 0; font: 500 0.86rem/1.5 var(--mono); color: var(--indigo); text-align: right; }

section + section { border-top: 1px solid var(--rule); }
section[id] { padding-block: var(--gap); scroll-margin-top: 60px; }
.secnum { margin: 0 0 10px; }
.secnum::after {
  content: ""; display: inline-block; width: 46px; height: 2px; background: var(--rope);
  vertical-align: 4px; margin-left: 12px;
}
section[id] > .wrap > h2 { font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.3rem); max-width: 22ch; }
.secintro { margin: 14px 0 clamp(28px, 4vw, 46px); max-width: 62ch; color: var(--ink-2); }

.finder-grid { display: grid; gap: clamp(28px, 4vw, 48px); align-items: start; }
.finder fieldset { border: 0; border-top: 1px solid var(--rule); margin: 0 0 22px; padding: 16px 0 0; }
.finder legend {
  padding: 0; font: 600 0.9rem/1.3 var(--sans); color: var(--ink); display: flex; gap: 10px; align-items: baseline;
}
.qn { color: var(--indigo); }
.opts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.opts label {
  display: inline-flex; align-items: center; gap: 9px; padding: 9px 13px; cursor: pointer;
  border: 1px solid var(--rule); background: var(--paper); font-size: 0.9rem; line-height: 1.25;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.opts input { accent-color: var(--indigo); margin: 0; flex: none; }
.opts label:hover { background: var(--paper-2); }
.opts label:has(input:checked) { background: var(--indigo); border-color: var(--indigo); color: var(--paper); }
.opts input:checked { accent-color: var(--rope); }
.opts label:has(:focus-visible) { outline: 2px solid var(--indigo); outline-offset: 3px; }
.finder-actions { margin: 4px 0 0; }
.finder-actions button {
  background: none; border: 1px solid var(--indigo); color: var(--indigo); padding: 10px 16px; cursor: pointer;
  font: 500 0.76rem/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
}
.finder-actions button:hover { background: var(--indigo); color: var(--paper); }
.keepnote {
  margin: 18px 0 0; padding-left: 12px; max-width: 48ch; font-size: 0.86rem; color: var(--ink-2);
  border-left: 3px solid var(--rule);
}
.nojs {
  margin: 18px 0 0; padding-left: 12px; font-size: 0.9rem; color: var(--ink-2);
  border-left: 3px solid var(--rope);
}

.rescount {
  margin: 0 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--indigo);
  font: 500 0.78rem/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--indigo);
}
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.card { background: var(--paper-2); border-left: 4px solid var(--rope); padding: 16px 18px; }
.ck { margin: 0 0 6px; display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; }
.ck a { font: 600 1.08rem/1.3 var(--serif); }
.cw { margin: 0 0 6px; font-size: 0.95rem; }
.cc { margin: 0; font-size: 0.88rem; color: var(--ink-2); }
.cc b { color: var(--rope-ink); letter-spacing: 0.06em; font: 600 0.74rem var(--mono); text-transform: uppercase; }
.empty { background: var(--paper-2); border-left: 4px solid var(--indigo); padding: 16px 18px; font-size: 0.95rem; }

.plate {
  display: grid; gap: 18px; padding-block: clamp(32px, 4vw, 52px);
  border-top: 1px solid var(--rule); scroll-margin-top: 60px;
}
.plate:first-of-type { border-top: 2px solid var(--indigo); }
.pnum { margin: 0; display: flex; align-items: baseline; gap: 10px; }
.pnum span {
  font: 500 0.72rem/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2);
}
.pnum b { font: 400 2.1rem/0.9 var(--serif); color: var(--indigo); }
.pbody h3 { font-size: clamp(1.35rem, 1.1rem + 1vw, 1.8rem); }
.phint { margin: 8px 0 20px; letter-spacing: 0.1em; }
.phint span { white-space: nowrap; }

.fig { margin: 0 0 22px; }
.fig-svg {
  display: block; width: 100%; max-width: 440px; aspect-ratio: 200 / 130;
  background: var(--paper-2); border: 1px solid var(--rule);
}

.rc, .ro, .rr { fill: none; stroke-linejoin: round; stroke-linecap: var(--cap, round); }
.rc { stroke: var(--paper-2); stroke-width: 13; }
.ro { stroke: var(--indigo); stroke-width: 9; }
.rr { stroke: var(--rope); stroke-width: 5.2; stroke-linecap: var(--cap-core, round); }
.rc.tk { stroke-width: 17; }
.ro.tk { stroke-width: 12.5; }
.rr.tk { stroke-width: 8; }
.rc.tn { stroke-width: 10.5; }
.ro.tn { stroke-width: 6.5; }
.rr.tn { stroke-width: 3.4; }
.fig-svg .x { --cap: butt; --cap-core: square; }
.fig-svg .bar { fill: var(--paper-3); stroke: var(--indigo); stroke-width: 1.6; }
.fig-svg .ring { fill: none; stroke: var(--indigo); stroke-width: 11; }
.fig-svg .ring2 { fill: none; stroke: var(--steel); stroke-width: 5; }
.fig-svg .ah { fill: var(--indigo); stroke: none; }
.fig-svg .gh {
  fill: none; stroke: var(--indigo); stroke-width: 1.7; stroke-dasharray: 4 3; stroke-linecap: round;
}
.fig-svg .fl { font: 600 7px var(--mono); letter-spacing: 0.08em; fill: var(--ink-2); }
.fig figcaption {
  margin-top: 10px; max-width: 440px; font-size: 0.86rem; color: var(--ink-2); font-style: italic;
}

.cols { display: grid; gap: clamp(22px, 3vw, 40px); }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; }
.steps li {
  counter-increment: s; position: relative; padding: 0 0 12px 40px; margin-bottom: 12px;
  border-bottom: 1px dotted var(--rule); font-size: 0.97rem;
}
.steps li:last-child { border-bottom: 0; margin-bottom: 0; }
.steps li::before {
  content: counter(s, decimal-leading-zero); position: absolute; left: 0; top: 1px;
  font: 500 0.8rem/1.5 var(--mono); color: var(--rope-ink);
}
.watch { background: var(--paper-2); border-top: 2px solid var(--indigo); padding: 16px 18px; align-self: start; }
.watch h4 {
  margin: 0 0 8px; font: 500 0.74rem/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--indigo);
}
.watch p { margin: 0; font-size: 0.93rem; }

.note { border-top: 1px solid var(--rule); }
.note:first-of-type { border-top: 2px solid var(--indigo); }
.note summary {
  display: flex; align-items: baseline; gap: 14px; padding: 20px 44px 20px 0; cursor: pointer; position: relative;
  font: 600 clamp(1.1rem, 1rem + 0.6vw, 1.35rem)/1.3 var(--serif); list-style: none;
}
.note summary::-webkit-details-marker { display: none; }
.note summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; translate: 0 -50%;
  font: 400 1.5rem/1 var(--mono); color: var(--indigo);
}
.note[open] summary::after { content: "\2212"; }
.note summary:hover { color: var(--indigo); }
.nnum {
  flex: none; width: 26px; height: 26px; display: grid; place-items: center; background: var(--indigo);
  color: var(--paper); font: 500 0.78rem/1 var(--mono); translate: 0 -1px;
}
.notebody {
  padding: 0 0 26px 40px; max-width: 66ch; border-left: 2px solid var(--paper-3); margin-left: 12px;
}
.notebody p:last-child { margin-bottom: 0; }

.tscroll { overflow-x: auto; border-top: 2px solid var(--indigo); }
table { border-collapse: collapse; width: 100%; min-width: 620px; }
caption { text-align: left; }
th, td { text-align: left; vertical-align: top; padding: 12px 18px 12px 0; border-bottom: 1px solid var(--rule); }
thead th {
  font: 500 0.72rem/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2);
  padding-top: 12px;
}
tbody th { font: 600 0.99rem/1.4 var(--serif); color: var(--ink); width: 24%; }
tbody td { font-size: 0.9rem; color: var(--ink-2); }
tbody tr:hover { background: var(--paper-2); }
tbody td:nth-child(3) {
  font: 500 0.74rem/1.6 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--rope-ink);
}

footer { border-top: 2px solid var(--indigo); background: var(--paper-2); padding-block: clamp(40px, 5vw, 72px); }
.foot { display: grid; gap: 32px; }
.footbrand {
  margin: 0 0 6px; font: 650 0.94rem/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--indigo);
}
.footline { color: var(--ink-2); letter-spacing: 0.06em; text-transform: none; }
.footnav { display: flex; flex-direction: column; gap: 8px; }
.footnav a {
  font: 500 0.78rem/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none;
}
.footnav a:hover { text-decoration: underline; }

@media (min-width: 720px) {
  .cols { grid-template-columns: 1.1fr 0.9fr; }
  .foot { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 48px; }
}

@media (min-width: 860px) {
  .mh-grid { grid-template-columns: minmax(0, 1.55fr) minmax(260px, 1fr); }
  .mh-grid > div { grid-row: 1 / span 2; }
  .mh-grid .caution { grid-column: 2; }
  .finder-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); }
  .plate { grid-template-columns: 6.5rem minmax(0, 1fr); gap: 0 clamp(24px, 3vw, 44px); }
  .pnum { flex-direction: column; gap: 4px; position: sticky; top: 72px; align-self: start; }
  .pnum b { font-size: 3rem; }
}

@media (min-width: 1000px) {
  .pbody { display: grid; grid-template-columns: minmax(0, 440px) minmax(0, 1fr); column-gap: clamp(28px, 3vw, 44px); }
  .pbody > h3, .pbody > .phint { grid-column: 1 / -1; }
  .cols { display: contents; }
  .fig { grid-column: 1; grid-row: 3; }
  .steps { grid-column: 2; grid-row: 3 / span 2; }
  .watch { grid-column: 1; grid-row: 4; }
}

@media (max-width: 760px) {
  .datablock dd { font-size: 0.8rem; }
  .notebody { padding-left: 20px; margin-left: 4px; }
  .opts label { font-size: 0.88rem; padding: 8px 11px; }
}

@media (max-width: 440px) {
  .navrow { gap: 2px; padding-inline: 4px; }
  .navrow a { padding: 9px 8px; letter-spacing: 0.08em; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}