/* Blueprint: a drafting sheet. docs/website.md is the spec. */

:root {
  --paper: #E9EDF0;
  --ink: #13212E;
  --ink-2: #3A4A5A;
  --muted: #4A5968;
  --line: #2B5C8A;
  --fault: #B23A0C;
  --grid-minor: rgba(43, 92, 138, 0.07);
  --grid-major: rgba(43, 92, 138, 0.14);
  --inset: 24px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Archivo", ui-sans-serif, system-ui, -apple-system, sans-serif;
  color-scheme: light;
}

/* The dark variant is a real blueprint: dark ground, pale ink. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0E2233;
    --ink: #E6EEF4;
    --ink-2: #C3D0DB;
    --muted: #9FB2C3;
    --line: #8CC3EE;
    --fault: #F08A5D;
    --grid-minor: rgba(140, 195, 238, 0.07);
    --grid-major: rgba(140, 195, 238, 0.15);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0E2233;
  --ink: #E6EEF4;
  --ink-2: #C3D0DB;
  --muted: #9FB2C3;
  --line: #8CC3EE;
  --fault: #F08A5D;
  --grid-minor: rgba(140, 195, 238, 0.07);
  --grid-major: rgba(140, 195, 238, 0.15);
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  background-position: var(--inset) var(--inset);
  color: var(--ink-2);
  font: 400 18px/1.55 var(--sans);
}

/* The sheet's ruled border, inset from the viewport. */
body::before {
  content: "";
  position: fixed;
  inset: var(--inset);
  border: 1.5px solid var(--ink);
  pointer-events: none;
  z-index: 10;
}

a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--line); }
:focus-visible { outline: 2px solid var(--line); outline-offset: 2px; }

.page {
  max-width: 1000px;
  margin: 0 auto;
  padding: calc(var(--inset) + 40px) calc(var(--inset) + 40px) calc(var(--inset) + 48px);
}

/* Header: the drawing number and the navigation. */
.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px 32px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 56px;
}
.mark {
  font: 500 13px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.mark b { font-weight: 500; color: var(--line); }
nav { display: flex; flex-wrap: wrap; gap: 6px 22px; }
nav a {
  font: 400 13px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 0;
}
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }
nav a[aria-current="page"] { box-shadow: inset 0 -1.5px 0 var(--line); }

/* Type. */
h1, h2, h3 { font-family: var(--sans); color: var(--ink); margin: 0; }
h1 {
  font-weight: 700;
  font-size: clamp(36px, 6vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 16ch;
}
h2 {
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
h3 { font-weight: 600; font-size: 20px; line-height: 1.3; margin-bottom: 6px; }
p { margin: 0 0 1em; max-width: 620px; }
.lede { font-size: 21px; line-height: 1.5; color: var(--ink-2); max-width: 640px; margin-top: 24px; }
code, .mono { font-family: var(--mono); font-size: 0.86em; }
code { color: var(--ink); }
strong { color: var(--ink); font-weight: 600; }

.label, .section {
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.section { color: var(--line); margin-bottom: 14px; display: block; }

section { margin-top: 88px; }
section:first-of-type { margin-top: 0; }

/* A dimension line: a thin rule with end ticks and a label. */
.dim {
  position: relative;
  height: 28px;
  margin: 28px 0;
  color: var(--line);
}
.dim::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  border-top: 1px solid currentColor;
}
.dim > i, .dim::after {
  content: "";
  position: absolute;
  top: 25%; bottom: 25%;
  border-left: 1px solid currentColor;
}
.dim::after { right: 0; }
.dim > i { left: 0; }
.dim > span {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  background: var(--paper);
  padding: 0 10px;
  font: 400 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Boxes sit on paper so the grid does not show through. */
.box {
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 20px 22px;
}

/* The record strip: records as joined boxes. */
/* One row, scrolled sideways when it is longer than the sheet, so every
   connector joins two boxes. */
.strip {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  overflow-x: auto;
  margin: 8px 0;
  padding: 4px 4px 10px;
  list-style: none;
}
.strip li {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 112px;
  padding: 10px 12px;
  background: var(--paper);
  border: 1px solid var(--ink);
  font: 400 12px/1.3 var(--mono);
  color: var(--muted);
  flex: 0 0 auto;
  margin-right: 22px;
}
.strip li:last-child { margin-right: 0; }
.strip li:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -23px; top: 50%;
  width: 22px;
  border-top: 1px solid var(--ink);
}
.strip li b {
  font-weight: 500;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.strip li .to { color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 150px; }
.strip li[data-ok="true"] { border-color: var(--line); }
.strip li[data-ok="true"] .tick { color: var(--line); }
.strip li[data-ok="false"] { border-color: var(--fault); }
.strip li[data-ok="false"] .tick { color: var(--fault); }
.strip li[data-state="fault"] b { color: var(--fault); }
.strip li button {
  all: unset;
  position: absolute;
  inset: 0;
  cursor: pointer;
}
.strip li button:focus-visible { outline: 2px solid var(--line); outline-offset: 2px; }
.strip li[aria-current="true"] { box-shadow: 0 0 0 2px var(--line); }
.tick { min-height: 1.3em; }

/* The title block, bottom right, as on a drawing. */
.title-block {
  display: grid;
  grid-template-columns: auto 1fr;
  width: min(100%, 420px);
  margin: 96px 0 0 auto;
  background: var(--paper);
  border: 1.5px solid var(--ink);
  font: 400 12px/1.3 var(--mono);
}
.title-block > div {
  padding: 8px 12px;
  border-bottom: 1px solid var(--ink);
}
.title-block > div:nth-last-child(-n + 2) { border-bottom: 0; }
.title-block > div:nth-child(odd) {
  border-right: 1px solid var(--ink);
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.title-block > div:nth-child(even) { color: var(--ink); overflow-wrap: anywhere; }
.title-block .head { color: var(--line); }
.title-block .bad { color: var(--fault); }

/* Grids of cards and two-column layouts. */
.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.cols .box p { font-size: 16px; margin: 0; }
.num {
  display: block;
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.1em;
  color: var(--line);
  margin-bottom: 12px;
}

/* Tables. */
.table-wrap { overflow-x: auto; background: var(--paper); border: 1px solid var(--ink); }
table { width: 100%; border-collapse: collapse; font-size: 16px; }
th, td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--grid-major); }
tr:last-child td { border-bottom: 0; }
th {
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--ink);
}
td.status { font-family: var(--mono); font-size: 13px; color: var(--ink); white-space: nowrap; }

pre {
  margin: 0;
  overflow-x: auto;
  font: 400 13px/1.6 var(--mono);
  color: var(--ink);
}

.list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--ink); }
.list li { padding: 18px 0; border-bottom: 1px solid var(--grid-major); }
.list li p { margin: 4px 0 0; font-size: 16px; }
.list a, .list strong { font-weight: 600; color: var(--ink); }

.fault { color: var(--fault); }

/* Buttons. */
.btn {
  appearance: none;
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 11px 14px;
  cursor: pointer;
}
.btn:hover { color: var(--line); border-color: var(--line); }
.btn:disabled { color: var(--muted); border-color: var(--muted); cursor: default; }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--line); border-color: var(--line); color: var(--paper); }
.btn[aria-pressed="true"] { box-shadow: inset 0 -2px 0 var(--line); color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }

@media (max-width: 640px) {
  :root { --inset: 10px; }
  body { font-size: 17px; }
  .page { padding: calc(var(--inset) + 24px) calc(var(--inset) + 16px) calc(var(--inset) + 32px); }
  .top { margin-bottom: 40px; }
  section { margin-top: 64px; }
  .title-block { margin-top: 64px; }
  .dim > span { white-space: normal; text-align: center; max-width: 80%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}