/* Quillharbor Cycleworks — drawing-office language. Graphite on paper, blueprint rule, mono specs. */

:root {
  --paper: #f4f6f7;
  --paper-2: #e8ecee;
  --paper-3: #dde3e6;
  --graphite: #171b1f;
  --graphite-2: #48535a;
  --graphite-3: #6d787e;
  --rule: #c6ced2;
  --blue: #12657f;
  --blue-2: #0e4f64;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --wrap: 1140px;
  --pad: clamp(18px, 4vw, 44px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14181b; --paper-2: #1b2125; --paper-3: #232a2f;
    --graphite: #e7edf0; --graphite-2: #a8b4ba; --graphite-3: #7d8990;
    --rule: #2f383d; --blue: #6fb6cf; --blue-2: #8fcde3;
  }
}
:root[data-theme="dark"] {
  --paper: #14181b; --paper-2: #1b2125; --paper-3: #232a2f;
  --graphite: #e7edf0; --graphite-2: #a8b4ba; --graphite-3: #7d8990;
  --rule: #2f383d; --blue: #6fb6cf; --blue-2: #8fcde3;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--graphite);
  font: 400 1rem/1.62 var(--sans);
}
h1, h2, h3 { margin: 0; line-height: 1.08; text-wrap: balance; }
h1 { font: 700 clamp(2rem, 5.2vw, 3.25rem)/1.03 var(--sans); letter-spacing: -0.028em; text-transform: uppercase; }
h2 { font: 700 clamp(1.15rem, 2.4vw, 1.5rem)/1.1 var(--sans); letter-spacing: -0.012em; text-transform: uppercase; }
h3 { font: 700 1rem/1.3 var(--sans); letter-spacing: -0.006em; }
p { margin: 0 0 1em; max-width: 68ch; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 0.16em; }
a:hover { color: var(--graphite); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
svg { max-width: 100%; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 9; background: var(--graphite); color: var(--paper); padding: 8px 14px; }

.tag {
  font: 400 0.6875rem/1 var(--mono);
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--graphite-3);
  font-variant-numeric: tabular-nums;
}

/* header: a title block, like a drawing sheet */
.sheet { border-bottom: 2px solid var(--graphite); background: var(--paper-2); }
.sheet .wrap { display: grid; grid-template-columns: auto 1fr auto; gap: 12px 24px; align-items: center; padding-block: 12px; }
.mark { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--graphite); }
.mark svg { width: 30px; height: 30px; }
.mark span { font: 700 0.9375rem/1 var(--sans); letter-spacing: 0.04em; text-transform: uppercase; }
.sheet nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0; padding: 0; list-style: none; }
.sheet nav a { font: 400 0.75rem/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; text-decoration: none; color: var(--graphite-2); padding: 6px 0; border-bottom: 2px solid transparent; }
.sheet nav a:hover, .sheet nav a[aria-current="page"] { color: var(--graphite); border-bottom-color: var(--blue); }
.sheet .rev { font: 400 0.6875rem/1.4 var(--mono); color: var(--graphite-3); text-align: right; }

/* sections keyed like drawing views */
.view { border-bottom: 1px solid var(--rule); padding-block: clamp(34px, 6vw, 76px); }
.view .wrap { display: grid; grid-template-columns: 78px minmax(0, 1fr); gap: 0 clamp(16px, 3vw, 40px); }
.view .key { font: 400 0.75rem/1.35 var(--mono); color: var(--blue); letter-spacing: 0.06em; padding-top: 4px; }
.view .body { min-width: 0; }
.lead { font-size: clamp(1.0625rem, 1.7vw, 1.1875rem); color: var(--graphite-2); max-width: 58ch; }

.opener { background: var(--paper-2); }
.opener h1 { margin-bottom: 18px; }
.opener .body { display: grid; gap: 22px; }

/* spec grid */
.specs { display: grid; grid-template-columns: repeat(auto-fit, minmax(178px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin: 6px 0 0; padding: 0; list-style: none; }
.specs > li { background: var(--paper); padding: 14px 16px; }
.specs dt, .specs .k { font: 400 0.6875rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--graphite-3); }
.specs .v { display: block; margin-top: 7px; font: 400 1.0625rem/1.25 var(--mono); font-variant-numeric: tabular-nums; }
.specs .v small { font-size: 0.75rem; color: var(--graphite-3); }

/* tables */
.scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
caption { text-align: left; font: 400 0.75rem/1.5 var(--mono); color: var(--graphite-3); padding-bottom: 10px; }
th, td { padding: 10px 16px 10px 0; text-align: left; border-bottom: 1px solid var(--rule); }
thead th { font: 400 0.6875rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--graphite-3); border-bottom-color: var(--graphite); }
tbody th { font: 400 0.9375rem/1.4 var(--mono); white-space: nowrap; }
td { font: 400 0.9375rem/1.4 var(--mono); }
td.t, th.t { font-family: var(--sans); font-size: 0.9375rem; }
.num { text-align: right; padding-right: 0; }
tbody tr:hover td, tbody tr:hover th { background: var(--paper-2); }

/* drawing */
.drawing { margin: 0; background: var(--paper-2); border: 1px solid var(--rule); padding: clamp(12px, 2.5vw, 26px); }
.drawing figcaption { margin-top: 14px; font: 400 0.75rem/1.5 var(--mono); color: var(--graphite-3); }
.dim { stroke: var(--blue); stroke-width: 1; fill: none; }
.tube { stroke: var(--graphite); stroke-width: 3.2; fill: none; stroke-linecap: round; }
.thin { stroke: var(--graphite-3); stroke-width: .8; fill: none; stroke-dasharray: 5 4; }
.dlabel { fill: var(--blue); font: 11px var(--mono); }
.drawing:hover .dim { stroke-width: 1.4; }
.dim, .tube { transition: stroke-width .2s ease; }

/* prose columns */
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); gap: clamp(20px, 3vw, 44px); }
.cols h3 { margin-bottom: 8px; }
.cols p { margin-bottom: 0.7em; }
.rulehead { border-top: 2px solid var(--graphite); padding-top: 10px; margin-bottom: 20px; }

/* footer */
.foot { background: var(--paper-2); padding-block: clamp(28px, 4vw, 48px) 34px; }
.foot .wrap { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.foot h3 { font: 400 0.6875rem/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--graphite-3); margin-bottom: 10px; }
.foot p, .foot address { margin: 0 0 6px; font-style: normal; font-size: 0.875rem; color: var(--graphite-2); }
.foot .fine { grid-column: 1 / -1; border-top: 1px solid var(--rule); padding-top: 16px; font: 400 0.75rem/1.6 var(--mono); color: var(--graphite-3); }

.gone { padding-block: clamp(70px, 12vw, 150px); }

@media (max-width: 680px) {
  .sheet .wrap { grid-template-columns: 1fr; }
  .sheet .rev { text-align: left; }
  .view .wrap { grid-template-columns: minmax(0, 1fr); }
  .view .key { padding-bottom: 12px; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }