/* ==========================================================================
   Melodic Folds — one stylesheet, no framework.

   Paper rules: white ground, two ink colours, hairline rules instead of
   boxes, square corners everywhere, and no hover movement of any kind. Size
   range is deliberately wide: 14px body against a 56px display.
   ========================================================================== */

:root {
  --crease-mountain: #d7263d;
  --crease-valley: #16324f;
  --paper-grain: #f2f2f2;
  --crease-ground: #ffffff;
  --crease-rule: rgba(22, 50, 79, 0.14);
  --crease-soft: rgba(22, 50, 79, 0.62);
  --crease-dock: 58px;
  --crease-measure: 68ch;
  --crease-face: "Helvetica Neue", Helvetica, Inter, "Segoe UI", Arial, sans-serif;
  --crease-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--crease-ground);
  color: var(--crease-valley);
  font-family: var(--crease-face);
  font-size: 14px;
  line-height: 1.62;
  font-variant-numeric: tabular-nums;
  padding-bottom: calc(var(--crease-dock) + 24px);
}

/* The crease pattern that sits behind the home screen. It is a real file, not
   a background gradient, and it never moves. */
.lattice {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
  z-index: -1;
  pointer-events: none;
}

a { color: var(--crease-valley); text-decoration: none; }
a:hover { color: var(--crease-mountain); }
a:focus-visible { outline: 2px solid var(--crease-mountain); outline-offset: 2px; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--crease-mountain);
  color: #fff;
  padding: 10px 16px;
}
.skip:focus { left: 0; z-index: 50; }

/* ------------------------------------------------------------------ masthead */
.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 22px clamp(16px, 4vw, 48px) 18px;
  border-bottom: 1px solid var(--crease-rule);
}
.wordmark {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.lang {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--crease-mountain);
  padding-bottom: 2px;
  color: var(--crease-mountain);
}

main { display: block; }

.stage {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 64px) clamp(16px, 4vw, 48px) 40px;
}

/* ------------------------------------------------------------------ overture */
.overture { max-width: var(--crease-measure); margin-bottom: clamp(28px, 5vw, 56px); }
.kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-soft);
}
.display {
  font-size: clamp(30px, 6vw, 56px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 18px;
}
.lede {
  font-size: 16px;
  line-height: 1.58;
  margin: 0 0 18px;
  max-width: var(--crease-measure);
}

/* -------------------------------------------------------------------- lists */
.roll { margin-bottom: clamp(30px, 5vw, 56px); }
.roll-head {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-mountain);
  margin: 0 0 6px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--crease-valley);
}
.starlist { list-style: none; margin: 0; padding: 0; }
.starline {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) minmax(0, 15em);
  align-items: baseline;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--crease-rule);
}
.starline-title { font-weight: 700; }
.starline-meta { color: var(--crease-soft); font-size: 12.5px; }
.stars { color: var(--crease-mountain); letter-spacing: 0.08em; }
.glyph { font-family: var(--crease-mono); font-size: 12px; color: var(--crease-valley); }

/* --------------------------------------------------------------- folds list */
.foldlist { list-style: none; margin: 0; padding: 0; }
.foldrow {
  padding: 18px 0;
  border-bottom: 1px solid var(--crease-rule);
}
.foldrow-main {
  display: grid;
  grid-template-columns: 3.5em minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
}
.foldrow-count {
  font-family: var(--crease-mono);
  font-size: 22px;
  color: var(--crease-mountain);
}
.foldrow-title { font-size: 18px; font-weight: 700; }
.foldrow-meta { font-size: 12.5px; color: var(--crease-soft); white-space: nowrap; }
.foldrow-chips { margin: 8px 0 0 4.5em; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.chip { font-size: 12.5px; color: var(--crease-soft); }
.chip b { color: var(--crease-valley); font-weight: 700; }
.chip-mark {
  display: inline-block;
  width: 22px;
  height: 0;
  margin-right: 7px;
  vertical-align: middle;
}
.fam-mountain { border-top: 2px solid var(--crease-mountain); }
.fam-valley { border-top: 2px dashed var(--crease-valley); }

/* -------------------------------------------------------------- model cells */
.bandgroup { margin: 0 0 clamp(30px, 5vw, 54px); }
.bandhead {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-soft);
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--crease-valley);
}
.modelgrid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: 26px 28px;
}
.modelcell { padding: 0; }
.thumb { display: block; width: 100%; height: auto; background: var(--paper-grain); }
.modelcell-title { display: block; margin-top: 10px; font-weight: 700; font-size: 15px; }
.modelcell-meta { display: block; margin: 2px 0 10px; }
.modelcell-spec {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 12px;
  margin: 0;
  font-size: 12.5px;
  border-top: 1px solid var(--crease-rule);
  padding-top: 8px;
}
.modelcell-spec dt { color: var(--crease-soft); }
.modelcell-spec dd { margin: 0; font-family: var(--crease-mono); }

/* ---------------------------------------------------------------- record page */
.record { max-width: 1180px; margin: 0 auto; padding: clamp(24px, 4vw, 52px) clamp(16px, 4vw, 48px) 40px; }
.record-head { max-width: 46em; }
/* The stamp row: publish date and editorial byline, one line, hairline under it.
   It is deliberately quieter than the kicker above the headline. */
.stamp {
  max-width: var(--crease-measure);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--crease-rule);
  font-size: 12.5px;
  color: var(--crease-soft);
}
.stamp time { font-family: var(--crease-mono); color: var(--crease-valley); }
.stamp-by { color: var(--crease-soft); }
.stamp-author { font-weight: 700; }

.record-cp { margin: 26px 0 4px; max-width: 460px; }
.record-cp img { display: block; width: 100%; height: auto; border: 1px solid var(--crease-rule); }
.cp-caption { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--crease-soft); margin: 6px 0 0; }
.record h2 {
  font-size: 20px;
  margin: 40px 0 10px;
  letter-spacing: -0.01em;
}
.record p { max-width: var(--crease-measure); }
.record > p { margin: 0 0 14px; }

.sequence { margin: 44px 0 8px; border-top: 1px solid var(--crease-valley); padding-top: 16px; }
.sequence-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.sequence-head h2 { margin: 0; }
.progress { font-family: var(--crease-mono); font-size: 13px; color: var(--crease-mountain); }
.sequence-all { font-size: 12.5px; margin-top: 14px; }

.frame-row {
  display: grid;
  grid-template-columns: minmax(220px, 340px) minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
  padding: 20px 0;
  border-top: 1px solid var(--crease-rule);
}
.crease-frame { margin: 0; }
.crease-frame img { display: block; width: 100%; height: auto; background: var(--paper-grain); }
.crease-frame figcaption {
  font-family: var(--crease-mono);
  font-size: 12px;
  color: var(--crease-soft);
  padding-top: 6px;
}
.step-copy { max-width: 46ch; }
.step-head {
  font-size: 12px !important;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-mountain);
  margin: 0 0 8px !important;
}
.step-head a { color: inherit; }
.step-copy p { margin: 0; font-size: 15px; }

.next-crease {
  display: inline-block;
  margin: 20px 0 6px;
  padding: 10px 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-mountain);
  border-bottom: 2px solid var(--crease-mountain);
  cursor: pointer;
}
.sequence-end {
  margin: 20px 0 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--crease-soft);
}
.htmx-request.next-crease { color: var(--crease-soft); border-bottom-color: var(--crease-soft); }

/* -------------------------------------------------------------------- tables */
.tablewrap { margin: 40px 0; max-width: 860px; }
.spectable, .legendtable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.spectable th, .spectable td, .legendtable th, .legendtable td {
  text-align: left;
  padding: 9px 12px 9px 0;
  border-bottom: 1px solid var(--crease-rule);
  vertical-align: top;
}
.spectable th[scope="row"] { width: 12em; color: var(--crease-soft); font-weight: 400; }
.legendtable thead th {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--crease-soft);
  border-bottom: 1px solid var(--crease-valley);
}
.legendtable th[scope="row"] { font-weight: 400; white-space: nowrap; }

/* ------------------------------------------------------------------ problems */
.problems details {
  border-bottom: 1px solid var(--crease-rule);
  padding: 10px 0;
  max-width: var(--crease-measure);
}
.problems summary { cursor: pointer; font-weight: 700; }
.problems summary:hover { color: var(--crease-mountain); }
.problems p { margin: 8px 0 4px; }

.tipsbox ul { max-width: var(--crease-measure); padding-left: 18px; }
.tipsbox li { margin-bottom: 6px; }

/* ---------------------------------------------------------------- symbol page */
.term {
  max-width: 62em;
  padding: 30px 0 34px;
  border-top: 1px solid var(--crease-rule);
}
.term-head {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 36px);
  align-items: end;
  margin-bottom: 18px;
}
.term-art { display: block; width: 100%; height: auto; background: var(--paper-grain); }
.term-title h2 { margin: 0 0 4px; font-size: 30px; letter-spacing: -0.02em; }
.term-alt { margin: 0; font-size: 13px; color: var(--crease-soft); }
.term-glyph { margin: 6px 0 0; font-size: 15px; letter-spacing: 0.16em; color: var(--crease-mountain); }
.term h3 { font-size: 15px; margin: 22px 0 6px; letter-spacing: 0.02em; }
.term p { max-width: var(--crease-measure); margin: 0 0 12px; }
.term-steps, .term-pitfalls { max-width: var(--crease-measure); padding-left: 20px; }
.term-steps li, .term-pitfalls li { margin-bottom: 6px; }
.term-pitfalls { color: var(--crease-soft); }
.term-used { font-size: 13px; margin-top: 16px; }

/* ---------------------------------------------------------------- legal pages */
.legalbody { max-width: var(--crease-measure); }
.legalbody h2 { font-size: 17px; margin: 30px 0 8px; }
.legalbody p { margin: 0 0 12px; }

/* ------------------------------------------------------------------- related */
.rail {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 46px 0 10px;
  padding-top: 16px;
  border-top: 1px solid var(--crease-valley);
}
.railcard { font-weight: 700; font-size: 14px; }
.railcard-stars { display: block; color: var(--crease-mountain); font-size: 12px; letter-spacing: 0.1em; }

/* ------------------------------------------------------------------- colophon */
.colophon {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px clamp(16px, 4vw, 48px) 40px;
  border-top: 1px solid var(--crease-rule);
  font-size: 13px;
}
.colophon h2 {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crease-soft);
  margin: 0 0 8px;
}
.colophon .col a, .colophon .col span { display: block; padding: 2px 0; }
/* Editorial disclaimer. Both languages are printed, one per line, at the foot of
   every page: the site is bilingual and the English wording is the one that
   governs, so it is not swapped out on the Chinese pages. */
.colophon .disclaimer {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--crease-rule);
  font-size: 12px;
  color: var(--crease-soft);
  max-width: 90ch;
}
.muted { color: var(--crease-soft); }
.mono { font-family: var(--crease-mono); }

/* ---------------------------------------------------------------------- dock */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--crease-ground);
  border-top: 1px solid var(--crease-valley);
}
.dock-item {
  text-align: center;
  padding: 17px 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-right: 1px solid var(--crease-rule);
}
.dock-item:last-child { border-right: 0; }
.dock-item.is-here { color: var(--crease-mountain); border-bottom: 3px solid var(--crease-mountain); padding-bottom: 14px; }

/* ------------------------------------------------------------------- narrow */
@media (max-width: 720px) {
  .starline { grid-template-columns: 74px minmax(0, 1fr); }
  .starline-meta { grid-column: 2; }
  .frame-row { grid-template-columns: minmax(0, 1fr); }
  .term-head { grid-template-columns: minmax(0, 1fr); }
  .term-art { max-width: 220px; }
  .foldrow-main { grid-template-columns: 3em minmax(0, 1fr); }
  .foldrow-meta { grid-column: 2; }
  .foldrow-chips { margin-left: 3.5em; }
  .record-cp { max-width: 100%; }
}