/* theme.css: ISO 14888-3 Revision Checker.
   Specimen-sheet layout: parchment ground, hairline grid, marginalia on the right.
   Seed-derived: teal primary, oxblood change marker, serif headings, mono plates. */

:root {
  --ink: #14181a;
  --ink-soft: #3d464a;
  --paper: #f4f1e8;
  --sheet: #fbf9f3;
  --teal: #0f4c4c;
  --teal-deep: #0a3636;
  --teal-wash: #e3ece8;
  --oxblood: #7a2e2a;
  --oxblood-wash: #f2e4e1;
  --rule: #d5cfbf;
  --rule-soft: #e6e1d4;
  --slate: #5d6569;
  --amber: #7a5308;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
}

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; line-height: 1.14; margin: 0 0 14px; letter-spacing: -0.01em; }
h1 { font-size: clamp(32px, 4.6vw, 54px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: 20px; line-height: 1.26; }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin: 7px 0; }
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
img { max-width: 100%; height: auto; display: block; }
code, .mono { font-family: var(--mono); font-size: 0.95em; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 30px 0; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 22px; }
.skip { position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff; padding: 12px 16px; z-index: 60; }
.skip:focus { left: 10px; top: 10px; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }

/* masthead */
.mast { background: var(--sheet); border-bottom: 1px solid var(--rule); }
.mast .wrap { display: flex; align-items: center; gap: 16px; justify-content: space-between; flex-wrap: wrap; padding-top: 12px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand .plate { font-family: var(--mono); font-weight: 700; font-size: 13px; letter-spacing: 0.04em; border: 1.5px solid var(--teal); color: var(--teal); padding: 5px 8px; }
.brand .txt { font-family: var(--serif); font-weight: 700; font-size: 18px; line-height: 1.1; }
.brand .sub { display: block; font-family: var(--mono); font-size: 12.5px; font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--slate); margin-top: 3px; }
nav.main { display: flex; gap: 2px; flex-wrap: wrap; align-items: center; }
nav.main a { display: inline-block; padding: 11px 9px; font-size: 15px; color: var(--ink-soft); text-decoration: none; }
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--teal); box-shadow: inset 0 -2px 0 var(--teal); }

/* index strip: the spec-sheet device, unique to this build */
.strip { background: var(--teal-deep); color: #e9efec; }
.strip .wrap { display: flex; gap: 0; overflow-x: auto; padding: 0 22px; scrollbar-width: thin; }
.strip a { color: #e9efec; text-decoration: none; font-family: var(--mono); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; padding: 10px 16px 9px 0; margin-right: 16px; white-space: nowrap; border-right: 1px solid rgba(255,255,255,0.18); }
.strip a:last-child { border-right: 0; }
.strip a span { color: #8fb3ae; margin-right: 7px; }
.strip a:hover { color: #fff; text-decoration: underline; }

/* hero: parchment sheet with a hairline grid */
.hero { position: relative; background:
    repeating-linear-gradient(0deg, transparent 0 38px, rgba(15,76,76,0.055) 38px 39px),
    repeating-linear-gradient(90deg, transparent 0 38px, rgba(15,76,76,0.055) 38px 39px),
    var(--paper);
  border-bottom: 1px solid var(--rule); padding: 42px 0 34px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr); gap: 44px; align-items: start; }
.eyebrow { font-family: var(--mono); font-size: 14px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--oxblood); margin: 0 0 12px; }
.hero h1 { margin-bottom: 16px; }
.lede { font-size: 18px; color: var(--ink-soft); max-width: 60ch; }
.price { font-family: var(--mono); font-size: 15px; color: var(--ink); background: var(--teal-wash); border-left: 3px solid var(--teal); padding: 9px 12px; margin: 16px 0; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 16px; }
.btn { display: inline-block; background: var(--teal); color: #fff; text-decoration: none; font-weight: 600; font-size: 16px; padding: 13px 20px; border: 1.5px solid var(--teal); border-radius: 2px; min-height: 48px; }
.btn:hover { background: var(--teal-deep); color: #fff; }
.btn.alt { background: transparent; color: var(--teal); }
.btn.alt:hover { background: var(--teal-wash); color: var(--teal-deep); }
.btn.on-dark { background: #fff; color: var(--teal-deep); border-color: #fff; }
.trustnote { font-size: 14.5px; color: var(--ink-soft); border-top: 1px dashed var(--rule); padding-top: 12px; margin-top: 16px; }
.badges { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 10px; }
.badge { font-family: var(--mono); font-size: 13px; letter-spacing: 0.03em; color: var(--teal-deep); background: var(--sheet); border: 1px solid var(--rule); padding: 5px 8px; }

/* the catalogue card */
.card { background: var(--sheet); border: 1px solid var(--rule); box-shadow: 4px 4px 0 rgba(15,76,76,0.08); padding: 18px 18px 14px; }
.card h2 { font-family: var(--mono); font-size: 14px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate); margin-bottom: 10px; font-weight: 600; }
.card .big { font-family: var(--serif); font-size: 54px; line-height: 1; margin: 0 0 4px; color: var(--teal-deep); }
.card .bigsub { font-size: 14.5px; color: var(--oxblood); margin-bottom: 12px; font-weight: 600; }
.card dl { margin: 0; }
.card dt { font-family: var(--mono); font-size: 14px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--slate); margin-top: 9px; }
.card dd { margin: 1px 0 0; font-size: 15px; }
.card .note { font-size: 14px; color: var(--slate); margin: 12px 0 0; border-top: 1px solid var(--rule-soft); padding-top: 9px; }

/* photo strip */
.photo-strip { border-bottom: 1px solid var(--rule); background: var(--sheet); }
.photo-strip img { width: 100%; height: clamp(180px, 30vw, 330px); object-fit: cover; }

/* sections: main column plus right marginalia */
.sheet { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 42px; padding: 44px 0; border-bottom: 1px solid var(--rule); }
.sheet:last-of-type { border-bottom: 0; }
.sheet .main { min-width: 0; max-width: 68ch; }
.sheet .margin { font-size: 14px; color: var(--ink-soft); border-left: 2px solid var(--rule); padding-left: 14px; }
.sheet .margin h3 { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--slate); margin-bottom: 7px; }
.sheet .margin p { margin-bottom: 10px; }
.kicker { font-family: var(--mono); font-size: 14px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--oxblood); margin: 0 0 8px; }
.num { font-family: var(--mono); font-size: 14px; color: var(--teal); letter-spacing: 0.08em; }
.wash { background: var(--teal-wash); }
.wash .sheet { border-bottom-color: #cfded8; }

/* ledger */
.ledger { margin: 22px 0; }
.ledger dt { font-family: var(--mono); font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal-deep); border-top: 1px solid var(--rule); padding-top: 11px; margin-top: 11px; }
.ledger dd { margin: 4px 0 0; }
.ledger dd ul { margin-bottom: 0; }
.answer { font-size: 19px; line-height: 1.55; border-left: 3px solid var(--oxblood); padding-left: 16px; margin: 18px 0 6px; }

/* tables */
.tablewrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--rule); background: var(--sheet); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
caption { text-align: left; font-size: 14px; color: var(--slate); padding: 10px 12px 0; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
th { font-family: var(--mono); font-size: 14px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--slate); background: var(--teal-wash); }
tbody tr:last-child td { border-bottom: 0; }
td code, .codelike { font-family: var(--mono); font-size: 14px; }

/* stage ladder */
.ladder { list-style: none; padding: 0; margin: 20px 0; border-left: 2px solid var(--rule); }
.ladder li { display: grid; grid-template-columns: 74px 108px 1fr; gap: 10px; padding: 9px 0 9px 16px; margin: 0; position: relative; font-size: 14.5px; border-bottom: 1px dotted var(--rule); }
.ladder li::before { content: ""; position: absolute; left: -6px; top: 16px; width: 10px; height: 10px; background: var(--sheet); border: 2px solid var(--rule); border-radius: 50%; }
.ladder li.done::before { background: var(--teal); border-color: var(--teal); }
.ladder li.now { background: var(--teal-wash); }
.ladder li.now::before { background: var(--oxblood); border-color: var(--oxblood); }
.ladder .code { font-family: var(--mono); font-weight: 700; color: var(--teal-deep); }
.ladder .date { font-family: var(--mono); color: var(--slate); font-size: 13px; }
.ladder .state { font-family: var(--mono); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--slate); }

/* panels and grids */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.panel { background: var(--sheet); border: 1px solid var(--rule); padding: 18px; }
.panel h3 { margin-bottom: 8px; }
.panel ul { margin-bottom: 0; }
.note { font-size: 14px; color: var(--slate); }

/* units */
.unit-head { display: flex; gap: 18px; align-items: flex-start; margin: 6px 0 4px; }
.codeplate { font-family: var(--mono); font-weight: 700; font-size: 14px; color: var(--teal-deep); border: 1.5px solid var(--teal); padding: 7px 9px; white-space: nowrap; margin: 6px 0 0; }
.meta { font-family: var(--mono); font-size: 12.5px; color: var(--slate); margin: 4px 0 0; }
.crumb { font-size: 14px; color: var(--slate); margin-bottom: 14px; }
.provenance { font-size: 14px; color: var(--ink-soft); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 10px 0; margin: 22px 0; }
.pager { display: flex; justify-content: space-between; gap: 14px; font-size: 14.5px; margin-top: 18px; }
.chip { display: inline-block; font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase; padding: 3px 7px; border: 1px solid var(--rule); color: var(--slate); }
.chip.new { color: var(--oxblood); border-color: var(--oxblood); background: var(--oxblood-wash); }
.chip.replaced { color: var(--amber); border-color: var(--amber); background: #f7f0df; }
.chip.extended { color: var(--teal-deep); border-color: var(--teal); background: var(--teal-wash); }

/* check */
.check { background: var(--sheet); border: 1px solid var(--rule); padding: 20px; margin: 18px 0; }
.check h2 { font-size: 24px; }
fieldset { border: 1px solid var(--rule); padding: 12px 14px; margin: 0 0 14px; }
legend { font-weight: 600; font-size: 15px; padding: 0 6px; }
label.radio { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 4px 0; font-size: 15.5px; }
label.radio input { width: 24px; height: 24px; flex: 0 0 24px; accent-color: var(--teal); }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.field select, .field input { width: 100%; font-size: 16px; padding: 11px 10px; border: 1px solid var(--rule); background: #fff; min-height: 46px; color: var(--ink); }
.hint { font-size: 14px; color: var(--slate); margin: 4px 0 0; }
.verdict { border: 1px solid var(--teal); background: var(--teal-wash); padding: 16px; margin: 16px 0; }
.verdict h3 { margin-bottom: 6px; }
.verdict ul { margin-bottom: 0; }
.disclaimer { font-size: 14px; color: var(--slate); margin-top: 12px; }
.answerbox textarea { width: 100%; min-height: 220px; font-family: var(--mono); font-size: 13px; line-height: 1.5; padding: 12px; border: 1px solid var(--rule); background: #fff; }

/* faq */
.faq details { border-bottom: 1px solid var(--rule); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 16.5px; }
.faq p { margin: 9px 0 0; }

/* footer */
footer { background: var(--teal-deep); color: #d8e2df; margin-top: 0; }
footer .wrap { padding: 30px 22px 34px; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 26px; font-size: 14px; }
footer h3 { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.09em; text-transform: uppercase; color: #9dbcb7; margin-bottom: 8px; }
footer a { color: #fff; }
footer ul { list-style: none; padding: 0; margin: 0; }
footer li { margin: 5px 0; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .sheet { grid-template-columns: 1fr; gap: 20px; padding: 32px 0; }
  .sheet .margin { border-left: 0; border-top: 1px solid var(--rule); padding-left: 0; padding-top: 12px; }
  .grid2 { grid-template-columns: 1fr; }
  footer .wrap { grid-template-columns: 1fr; }
  .card .big { font-size: 44px; }
}
@media (max-width: 560px) {
  body { font-size: 17px; }
  nav.main { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; max-width: 100%; }
  nav.main::-webkit-scrollbar { display: none; }
  nav.main a { padding: 10px 8px; font-size: 14.5px; white-space: nowrap; }
  .brand .sub { font-size: 12px; }
  .actions .btn { flex: 1 1 auto; text-align: center; }
  h1 { font-size: clamp(30px, 8.4vw, 38px); }
  .ladder li { grid-template-columns: 62px 1fr; }
  .ladder .what { grid-column: 1 / -1; }
  .unit-head { flex-direction: column; gap: 8px; }
  .hero { padding: 26px 0 24px; }
}
@media print {
  .mast, .strip, footer, .actions, .photo-strip { display: none; }
  .hero { background: none; }
  .sheet { display: block; }
}

/* tap targets: inline links inside prose reach 24px without changing the visual rhythm */
p a, li a, dd a, td a, .crumb a, footer a, .provenance a, .note a, .margin a, summary a {
  display: inline-block; padding-top: 3px; padding-bottom: 3px;
}
footer li a { padding-top: 4px; padding-bottom: 4px; }
.strip a { padding-top: 12px; padding-bottom: 11px; }