/* Stitchwright.
   The look is a printed pattern leaflet lying on knitter's graph paper: hard ink rules,
   a letterpress offset instead of a soft shadow, madder red and indigo. The background grid
   cells are 24x19px — wider than they are tall, the aspect ratio of an actual knit stitch,
   which is why a knitting chart never looks like squared maths paper. */

:root {
  --paper: #f6f1e4;
  --grid: rgba(43, 58, 92, .07);
  --panel: #fffdf7;
  --panel-2: #f2ece0;
  --ink: #23283a;
  --muted: #6f6a5e;
  --rule: #cdc4b2;
  --rule-strong: #23283a;
  --accent: #b3401f;
  --accent-soft: #f6e6df;
  --indigo: #2b3a5c;
  --warn: #8a5a12;
  --warn-soft: #f8eed8;
  --bad: #9c2626;
  --bad-soft: #f7e4e2;
  --offset: rgba(35, 40, 58, .18);
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --serif: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  --paper: #14161c;
  --grid: rgba(236, 231, 219, .055);
  --panel: #1c1f28;
  --panel-2: #232733;
  --ink: #ece7db;
  --muted: #948d80;
  --rule: #3a3f4d;
  --rule-strong: #6e7482;
  --accent: #e07c50;
  --accent-soft: #2d211b;
  --indigo: #9fb2d8;
  --warn: #d8ad5c;
  --warn-soft: #2a2416;
  --bad: #e0817a;
  --bad-soft: #2d1c1b;
  --offset: rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--ink);
  font: 16px/1.62 var(--sans);
  -webkit-font-smoothing: antialiased;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 24px 19px;
}

.wrap { width: min(1180px, 100% - 2.5rem); margin-inline: auto; }

.sr, .skip:not(:focus) {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.skip:focus {
  position: fixed; top: .6rem; left: .6rem; z-index: 20; background: var(--panel);
  padding: .6rem 1rem; border: 2px solid var(--ink);
}

/* ------------------------------------------------------------- header / footer */
header.site {
  border-bottom: 2px solid var(--rule-strong);
  background: var(--paper);
  position: sticky; top: 0; z-index: 10;
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .8rem 0; }
.bar-tools { display: flex; align-items: center; gap: .5rem; }
.brand {
  display: inline-flex; align-items: center; gap: .65rem;
  font: 600 1.2rem/1 var(--serif); color: var(--ink); text-decoration: none; letter-spacing: -.015em;
}
.mark { width: 42px; height: 34px; color: var(--accent); flex: none; }

.langs { display: flex; border: 1.5px solid var(--rule-strong); }
.langs button {
  background: none; border: 0; color: var(--muted); cursor: pointer;
  font: 600 .7rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase;
  padding: .62rem .6rem;
}
.langs button + button { border-left: 1.5px solid var(--rule-strong); }
.langs button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

button.ghost {
  background: none; border: 1.5px solid var(--rule-strong); color: var(--muted);
  width: 36px; height: 34px; cursor: pointer; font-size: .95rem; line-height: 1;
}
button.ghost:hover { color: var(--accent); }

footer.site { border-top: 2px solid var(--rule-strong); margin-top: 4.5rem; padding: 1.8rem 0 3rem; color: var(--muted); font-size: .9rem; }
footer.site a { color: var(--accent); }
footer .small { font-size: .84rem; opacity: .85; }

/* --------------------------------------------------------------------- hero */
.hero { padding: 3rem 0 2.4rem; max-width: 47rem; }
.eyebrow {
  font: 700 .72rem/1 var(--sans); letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .9rem;
}
h1 { font: 600 clamp(2.2rem, 6.4vw, 3.4rem)/1.03 var(--serif); margin: 0 0 .85rem; letter-spacing: -.028em; }
.lede { font-size: 1.12rem; margin: 0 0 .7rem; max-width: 40rem; }
.lede-sub { color: var(--muted); font-size: .95rem; margin: 0; }

/* ------------------------------------------------------------------- layout */
.tool { display: grid; grid-template-columns: minmax(0, 415px) minmax(0, 1fr); gap: 1.7rem; align-items: start; }
@media (max-width: 900px) { .tool { grid-template-columns: minmax(0, 1fr); } }

.panel {
  background: var(--panel);
  border: 1.5px solid var(--rule-strong);
  box-shadow: 4px 4px 0 var(--offset);
}
.form { padding: .2rem 1.2rem 1.2rem; position: sticky; top: 4.4rem; }
@media (max-width: 900px) { .form { position: static; } }

/* --------------------------------------------------------------------- form */
fieldset.step, details.step { border: 0; border-top: 1.5px solid var(--rule); padding: 1.1rem 0 .3rem; margin: 0; }
fieldset.step:first-of-type { border-top: 0; }
legend, summary {
  font: 700 .78rem/1.2 var(--sans); letter-spacing: .13em; text-transform: uppercase;
  padding: 0; display: flex; align-items: center; gap: .6rem; color: var(--ink);
}
summary { cursor: pointer; list-style: none; flex-wrap: wrap; padding-bottom: .3rem; }
summary::-webkit-details-marker { display: none; }
summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.sum-t { flex: none; }
summary em {
  font: 400 .78rem/1.3 var(--sans); color: var(--muted); font-style: normal;
  letter-spacing: 0; text-transform: none; flex: 1 1 100%; padding-left: 1.85rem;
}
.n {
  display: grid; place-items: center; width: 21px; height: 17px; flex: none;
  background: var(--accent); color: #fff; font-size: .72rem; font-weight: 700; letter-spacing: 0;
}
.hint { color: var(--muted); font-size: .87rem; margin: .55rem 0 0; }
.hint strong { color: var(--ink); }
.hint.reading { color: var(--indigo); font-weight: 500; }

label { display: block; font-size: .8rem; color: var(--muted); margin-top: .8rem; }
label > span:first-child { letter-spacing: .02em; }
.u { opacity: .65; font-size: .74rem; text-transform: lowercase; }
input, select {
  width: 100%; margin-top: .28rem; padding: .55rem .65rem;
  background: var(--paper); color: var(--ink);
  border: 1.5px solid var(--rule); border-radius: 0;
  font: 600 1rem/1.3 var(--sans); font-variant-numeric: tabular-nums;
}
input:hover, select:hover { border-color: var(--rule-strong); }
input:focus, select:focus { outline: 0; border-color: var(--accent); box-shadow: inset 0 -3px 0 var(--accent-soft); }
input[type="range"] { padding: 0; border: 0; accent-color: var(--accent); background: none; }
input[type="range"]:focus { box-shadow: none; outline: 2px solid var(--accent); outline-offset: 3px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: .65rem; }

.chips { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .7rem; }
.chip {
  border: 1.5px solid var(--rule); background: var(--paper); color: var(--muted);
  padding: .4rem .65rem; cursor: pointer; font: 500 .82rem/1 var(--sans);
}
.chip:hover { border-color: var(--rule-strong); color: var(--ink); }
.chip[aria-checked="true"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.slider { margin-top: 1rem; }
.slider output { float: right; font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------ results */
.results { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.2rem; min-width: 0; }
.summary { padding: 1.15rem; min-width: 0; }
.figures { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin-bottom: 1.1rem; border: 1.5px solid var(--rule); }
@media (max-width: 620px) { .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.fig { padding: .7rem .8rem; border-right: 1.5px solid var(--rule); }
.fig:last-child { border-right: 0; }
@media (max-width: 620px) {
  .fig:nth-child(2n) { border-right: 0; }
  .fig:nth-child(-n+2) { border-bottom: 1.5px solid var(--rule); }
}
.fig .k { display: block; font: 600 1.4rem/1.1 var(--serif); font-variant-numeric: tabular-nums; }
.fig .v { display: block; font-size: .69rem; color: var(--muted); margin-top: .25rem; letter-spacing: .1em; text-transform: uppercase; }

.schematic { overflow-x: auto; border: 1.5px solid var(--rule); background: var(--panel-2); }
.schematic svg { display: block; width: 100%; height: auto; min-width: 470px; }

.actions { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-top: 1.05rem; }
.actions button {
  border: 1.5px solid var(--rule-strong); background: var(--panel); color: var(--ink);
  padding: .58rem .9rem; cursor: pointer; font: 600 .85rem/1 var(--sans);
  letter-spacing: .04em; box-shadow: 2px 2px 0 var(--offset);
}
.actions button:hover { transform: translate(1px, 1px); box-shadow: 1px 1px 0 var(--offset); }
.actions button:active { transform: translate(2px, 2px); box-shadow: none; }
.actions button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.savemsg { font-size: .84rem; color: var(--muted); }
.savemsg a { color: var(--accent); }

.notice { padding: .8rem .95rem; font-size: .9rem; border: 1.5px solid; border-left-width: 5px; }
.notice.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.notice.warn { background: var(--warn-soft); border-color: var(--warn); color: var(--warn); }
.notice strong { display: block; margin-bottom: .3rem; letter-spacing: .05em; text-transform: uppercase; font-size: .74rem; }
.notice ul { margin: 0; padding-left: 1.05rem; }
.notice li + li { margin-top: .35rem; }

/* ------------------------------------------------------------------ pattern */
.pattern { padding: 1.3rem 1.45rem 2rem; min-width: 0; overflow-wrap: break-word; }
.pattern h2 {
  font: 700 .8rem/1.2 var(--sans); letter-spacing: .16em; text-transform: uppercase;
  margin: 2.1rem 0 .8rem; padding-bottom: .35rem;
  border-bottom: 3px double var(--rule-strong); color: var(--accent);
}
.pattern h2:first-child { margin-top: 0; }
.pattern .title { font: 600 1.65rem/1.15 var(--serif); margin: 0 0 .2rem; letter-spacing: -.02em; }
.pattern h3 { font: 700 .74rem/1.2 var(--sans); letter-spacing: .14em; text-transform: uppercase; margin: 1.5rem 0 .5rem; color: var(--muted); }
.pattern p { margin: 0 0 .75rem; }
.pattern .step-line { margin: 0 0 .8rem; padding-left: .9rem; border-left: 2px solid var(--rule); }
.pattern .count { font: 700 .92rem var(--mono); color: var(--accent); white-space: nowrap; }
.pattern .detail { color: var(--muted); font-style: italic; }
.pattern .note { background: var(--panel-2); padding: .6rem .8rem; color: var(--muted); margin: 0 0 .8rem; font-size: .93rem; }
.pattern dl.meas { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: .4rem 1.4rem; margin: 0; }
.pattern dl.meas div { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px dotted var(--rule); padding-bottom: .26rem; }
.pattern dt { color: var(--muted); font-size: .88rem; }
.pattern dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }
.pattern .abbr { font-size: .85rem; color: var(--muted); line-height: 1.95; }
.pattern .abbr b { color: var(--ink); font-family: var(--mono); font-size: .82rem; }
.pattern .sched {
  font: .82rem/2 var(--mono); color: var(--muted);
  background: var(--panel-2); border: 1.5px solid var(--rule); padding: .75rem .85rem; word-spacing: .18rem;
}
.pattern .sched b { color: var(--accent); font-weight: 700; }
.pattern .materials { list-style: none; padding: 0; margin: 0; }
.pattern .materials li { padding: .55rem 0; border-bottom: 1px solid var(--rule); }
.pattern .materials li:last-child { border-bottom: 0; }
.pattern .materials .d { display: block; color: var(--muted); font-size: .86rem; margin-top: .2rem; }
.gaugebox { background: var(--accent-soft); border-left: 5px solid var(--accent); padding: .8rem .95rem; font-weight: 600; }

/* ---------------------------------------------------------------------- why */
.why { margin-top: 4.2rem; }
.why h2 { font: 600 1.75rem/1.15 var(--serif); margin: 0 0 1.2rem; letter-spacing: -.02em; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; }
.cards article { background: var(--panel); border: 1.5px solid var(--rule-strong); box-shadow: 4px 4px 0 var(--offset); padding: 1.05rem 1.15rem; }
.cards h3 { font: 700 .95rem/1.3 var(--sans); margin: 0 0 .45rem; color: var(--accent); }
.cards p { margin: 0; font-size: .92rem; color: var(--muted); }

/* -------------------------------------------------------------------- print */
@media print {
  header.site, footer.site, .hero, .why, .form, .actions, .skip, #warnings { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .wrap { width: 100%; }
  .tool { display: block; }
  .panel { border: 0; box-shadow: none; padding: 0; }
  .summary { margin-bottom: 1rem; }
  .pattern h2 { break-after: avoid; }
  .pattern .step-line, .pattern .note { break-inside: avoid; }
  .schematic svg { min-width: 0; }
}