:root {
  --paper: #f8f3e9;
  --paper-2: #f1e9da;
  --card: #fbf8f1;
  --ink: #1b2540;
  --ink-soft: #4d556b;
  --camel: #a47c4a;
  --olive: #66693f;
  --rule: rgba(27, 37, 64, 0.16);
  --rule-strong: rgba(27, 37, 64, 0.38);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 var(--sans);
  overflow-x: hidden;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 400; margin: 0; }

:focus-visible { outline: 2px solid var(--camel); outline-offset: 3px; }

/* ---------- Masthead ---------- */
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 40px 14px;
  border-bottom: 1px solid var(--rule);
}
.brand { font-family: var(--serif); font-size: 22px; letter-spacing: .02em; }
.concept-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--olive);
  border: 1px solid var(--rule-strong);
  padding: 6px 12px;
  border-radius: 999px;
}
.disclaimer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 10px 40px;
  font-size: 14px;
  color: var(--ink-soft);
}
.disclaimer::before { content: "◆ "; color: var(--camel); font-size: 10px; vertical-align: 2px; }

main { max-width: 1280px; margin: 0 auto; padding: 0 40px; }

/* ---------- Intro ---------- */
.intro { padding: 36px 0 28px; max-width: 760px; }
.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--camel);
}
h1 { font-size: clamp(30px, 3.6vw, 46px); line-height: 1.1; letter-spacing: -.01em; }
.lede { margin: 14px 0 0; color: var(--ink-soft); font-size: 17px; }

/* ---------- Workspace ---------- */
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(340px, 0.9fr);
  gap: 48px;
  align-items: start;
  padding-bottom: 56px;
}

.stage {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 28px 28px 20px;
  position: sticky;
  top: 20px;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: -1px -1px;
  background-color: var(--card);
}
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(251, 248, 241, .92) 45%, rgba(251, 248, 241, .7));
  pointer-events: none;
}
.stage > * { position: relative; }

.shirt { display: block; width: 100%; height: auto; max-height: 640px; }
figcaption {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--rule);
  margin-top: 12px;
  padding-top: 12px;
  font-size: 14px;
}
.fig-label { font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); }
#shirt-desc { font-family: var(--serif); font-size: 17px; }

/* ---------- SVG drawing ---------- */
.shirt { --line: #1b2540; --stitch: rgba(27, 37, 64, .45); --fold: rgba(27, 37, 64, .14); }
.shirt[data-fabric="navy"] { --line: #0e1528; --stitch: rgba(240, 233, 216, .55); --fold: rgba(0, 0, 0, .25); }

.shirt .fab { fill: url(#pat-ivory); }
.shirt[data-fabric="sky"] .fab { fill: url(#pat-sky); }
.shirt[data-fabric="navy"] .fab { fill: url(#pat-navy); }

.shirt .line { stroke: var(--line); stroke-width: 1.4; stroke-linejoin: round; }
.shirt .line-strong { fill: none; stroke: var(--line); stroke-width: 1.4; }
.shirt .shade { fill: url(#shade); pointer-events: none; }
.shirt .stitch { fill: none; stroke: var(--stitch); stroke-width: .9; stroke-dasharray: 2.4 2; }
.shirt .fold { fill: none; stroke: var(--fold); stroke-width: 1.2; stroke-linecap: round; }
.shirt .fold-shadow { fill: rgba(27, 37, 64, .08); }
.shirt .neck { fill: rgba(27, 37, 64, .22); stroke: var(--line); stroke-width: 1; }
.shirt .btn { fill: #faf6ec; stroke: rgba(27, 37, 64, .55); stroke-width: 1; }
.shirt .btn-hole { stroke: rgba(27, 37, 64, .5); stroke-width: .9; }
.shirt .hook { fill: none; stroke: var(--camel); stroke-width: 3; stroke-linecap: round; }
.shirt .cufflink circle { fill: #c49a5c; stroke: #7a5a2e; stroke-width: 1.2; }
.shirt .cufflink path { stroke: #7a5a2e; stroke-width: 2.2; stroke-linecap: round; }

.shirt[data-collar="classic"] .collar-cutaway,
.shirt[data-collar="cutaway"] .collar-classic,
.shirt[data-cuff="button"] .cuff-french,
.shirt[data-cuff="french"] .cuff-button { display: none; }

.art.is-swapping { animation: swap .38s var(--ease); }
@keyframes swap { from { opacity: .45; } to { opacity: 1; } }

/* ---------- Controls ---------- */
.controls { min-width: 0; }
.controls-title { font-size: 28px; margin-bottom: 8px; }

.group { border: 0; margin: 0; padding: 18px 0 20px; border-top: 1px solid var(--rule); min-width: 0; }
.group legend {
  padding: 0;
  margin-bottom: 12px;
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 600;
}
.num { font-family: var(--serif); color: var(--camel); font-weight: 400; margin-right: 6px; letter-spacing: 0; font-size: 15px; }

.opts { display: grid; gap: 10px; }
.opts-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.opts-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.opt { position: relative; display: block; cursor: pointer; }
.opt input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  cursor: pointer;
}
.opt-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 44px;
  height: 100%;
  padding: 10px;
  border: 1px solid var(--rule);
  background: var(--card);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), background-color .2s var(--ease);
}
.opt-row { flex-direction: row; align-items: center; gap: 12px; }
.opt:hover .opt-body { border-color: var(--rule-strong); }
.opt input:checked + .opt-body {
  border-color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--ink);
  background: #fffdf8;
}
.opt input:checked + .opt-body .opt-name::after {
  content: " ✓";
  color: var(--camel);
}
.opt input:focus-visible + .opt-body { outline: 2px solid var(--camel); outline-offset: 3px; }

.opt-name { display: block; font-weight: 600; font-size: 15px; }
.opt-note { display: block; font-size: 13px; color: var(--ink-soft); }

.swatch {
  display: block;
  aspect-ratio: 4 / 3;
  width: 100%;
  margin-bottom: 8px;
  border: 1px solid var(--rule);
}
.swatch-ivory { background: repeating-conic-gradient(#e8dfc9 0 25%, #f4eddd 0 50%) 0 0 / 6px 6px; }
.swatch-sky {
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .35) 0 1px, transparent 1px 2px, rgba(142, 174, 203, .35) 2px 3px, transparent 3px 4px),
    #bcd2e5;
}
.swatch-navy { background: repeating-linear-gradient(90deg, #22335a 0 9px, #ece6d6 9px 10px, #22335a 10px 12px); }

.glyph { flex: none; width: 48px; height: 32px; fill: none; stroke: var(--ink); stroke-width: 1.5; stroke-linejoin: round; stroke-linecap: round; }

/* Selection summary */
.selection { border-top: 1px solid var(--rule); padding: 16px 0 4px; }
.selection-title { font-size: 13px; font-family: var(--sans); letter-spacing: .14em; text-transform: uppercase; font-weight: 600; margin-bottom: 8px; }
.selection dl { margin: 0; }
.selection dl > div { display: flex; justify-content: space-between; gap: 16px; padding: 6px 0; border-bottom: 1px dotted var(--rule-strong); }
.selection dt { color: var(--ink-soft); font-size: 14px; }
.selection dd { margin: 0; font-family: var(--serif); font-size: 17px; text-align: right; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; padding-top: 20px; }
.btn-primary, .btn-quiet, .tabs [role="tab"] {
  min-height: 48px;
  padding: 0 22px;
  font: 600 15px/1 var(--sans);
  letter-spacing: .02em;
  cursor: pointer;
  border: 1px solid var(--ink);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.btn-primary { background: var(--ink); color: var(--paper); flex: 1 1 200px; }
.btn-primary:hover { background: #2a375a; }
.btn-quiet { background: transparent; color: var(--ink); }
.btn-quiet:hover { background: var(--paper-2); }

/* ---------- Review ---------- */
.review { border-top: 1px solid var(--ink); padding: 40px 0 56px; scroll-margin-top: 16px; }
.review-head h2 { font-size: clamp(28px, 3vw, 38px); }
.review-head h2:focus { outline: none; }
.review-head h2:focus-visible { outline: 2px solid var(--camel); }
.ref { margin: 8px 0 0; color: var(--ink-soft); font-size: 14px; }
.ref code { font: 600 13px/1 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--ink); letter-spacing: .06em; }

.spec { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin: 28px 0 36px; border-top: 1px solid var(--rule); }
.spec > div { padding: 18px 24px 18px 0; border-bottom: 1px solid var(--rule); }
.spec > div + div { padding-left: 24px; border-left: 1px solid var(--rule); }
.spec dt { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--camel); margin-bottom: 6px; }
.spec dd { margin: 0; }
.spec strong { display: block; font: 400 21px/1.25 var(--serif); }
.spec dd span { display: block; color: var(--ink-soft); font-size: 14px; margin-top: 4px; }

.paths { max-width: 760px; }
.paths-intro { margin: 0 0 12px; font-size: 14px; color: var(--olive); }
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--ink); }
.tabs [role="tab"] { background: transparent; color: var(--ink-soft); border-color: transparent; border-bottom: 0; flex: 0 1 auto; }
.tabs [role="tab"][aria-selected="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tabs [role="tab"]:hover:not([aria-selected="true"]) { color: var(--ink); background: var(--paper-2); }
.panel { padding: 20px 4px 4px; }
.panel p { margin: 0 0 8px; }
.panel ul { margin: 0 0 12px; padding-left: 20px; }
.panel li { margin: 4px 0; }
.panel-flag { display: inline-block; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--olive); border: 1px solid currentColor; padding: 4px 10px; }
.panel-foot { font-size: 14px; color: var(--ink-soft); font-style: italic; }

/* ---------- Credit ---------- */
.credit { border-top: 1px solid var(--rule); text-align: center; padding: 28px 20px 40px; }
.credit p { margin: 0; font-family: var(--serif); font-style: italic; color: var(--ink-soft); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .workspace { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .stage { position: relative; top: auto; }
}

@media (max-width: 600px) {
  /* Keyboard focus scrolls clear of the sticky preview (~280px tall). */
  html { scroll-padding-top: 296px; }
  .masthead { padding: 10px 16px 8px; gap: 8px; }
  .brand { font-size: 18px; }
  .concept-label { font-size: 10px; letter-spacing: .08em; padding: 4px 8px; }
  .disclaimer { padding: 6px 16px; font-size: 12px; }
  main { padding: 0 16px; }
  .intro { padding: 10px 0 12px; }
  .eyebrow { margin-bottom: 6px; font-size: 11px; }
  h1 { font-size: 24px; }
  .lede { margin-top: 6px; font-size: 14px; }
  /* Block flow (not grid) so the sticky preview is bounded by the whole
     workspace and releases at its end, before the review section. */
  .workspace { display: block; padding-bottom: 40px; }
  .stage {
    position: sticky;
    top: 0;
    z-index: 5;
    margin: 0 -16px 12px;
    padding: 8px 16px 8px;
    border-width: 0 0 1px;
    box-shadow: 0 6px 12px -10px rgba(27, 37, 64, .35);
  }
  .shirt { height: 232px; max-height: none; min-height: 0; }
  figcaption { margin-top: 6px; padding-top: 6px; }
  .fig-label { display: none; }
  #shirt-desc { font-size: 14px; line-height: 1.3; text-align: center; }
  .review { scroll-margin-top: 8px; }
  .controls-title { font-size: 22px; }
  .group { padding: 12px 0 14px; }
  .group legend { margin-bottom: 8px; }
  .opts { gap: 8px; }
  .opt-body { padding: 8px; }
  .opt-row { gap: 8px; }
  .glyph { width: 36px; height: 24px; }
  .opt-name { font-size: 14px; }
  .opt-note { font-size: 12px; }
  .swatch { aspect-ratio: 16 / 9; margin-bottom: 6px; }
  .opts-3 .opt-note { display: none; }
  .actions .btn-quiet { flex: 1 1 100%; }
  .spec { grid-template-columns: minmax(0, 1fr); }
  .spec > div, .spec > div + div { padding: 14px 0; border-left: 0; }
  .tabs [role="tab"] { flex: 1 1 50%; padding: 0 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}