/* Fretquest — single-colour print-sheet styling.
   One accent (electric indigo), hairline rules, square corners, no shadow, no gradient,
   no hover lift. Activation is expressed with outline and colour, never with movement. */

:root {
  --fret-paper: #F5F3EE;
  --fret-ink: #1B1F24;
  --fret-grid: #C8CCD0;
  --fret-mute: #9BA1A6;
  --fret-sig: #3D5AFE;
  --fret-field: #FBFAF7;
  --fret-rule: 1px solid var(--fret-grid);
  --fret-face-display: 'Familjen Grotesk', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --fret-face-body: 'DM Sans', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --fret-face-num: 'Martian Mono', 'DejaVu Sans Mono', ui-monospace, monospace;
  --fret-measure: 68ch;
  --fret-rail-w: 16px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--fret-paper);
  color: var(--fret-ink);
  font-family: var(--fret-face-body);
  font-size: 17px;
  line-height: 1.7;
  padding-right: var(--fret-rail-w);
}

a { color: var(--fret-ink); text-decoration: none; border-bottom: 1px solid var(--fret-grid); }
a:hover, a:focus-visible { color: var(--fret-sig); border-bottom-color: var(--fret-sig); }
a:focus-visible { outline: 1.5px solid var(--fret-sig); outline-offset: 2px; }

h1, h2, h3, h4 {
  font-family: var(--fret-face-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0 0 .6em;
}

.num, code, kbd, samp, .stamp, .dot-label { font-family: var(--fret-face-num); font-variant-numeric: tabular-nums; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
.measure { max-width: var(--fret-measure); }

/* ------------------------------------------------------------------ masthead */

.masthead {
  border-bottom: var(--fret-rule);
  background: var(--fret-paper);
  position: relative;
  z-index: 4;
}
.masthead-in {
  display: flex;
  align-items: baseline;
  gap: 22px;
  padding: 14px 28px 12px;
  flex-wrap: wrap;
}
.masthead .brandmark {
  font-family: var(--fret-face-display);
  font-size: 19px;
  letter-spacing: .04em;
  border: 0;
  text-transform: uppercase;
}
.masthead .brandmark span { color: var(--fret-sig); }
.masthead nav { display: flex; gap: 18px; align-items: baseline; flex-wrap: wrap; }
.masthead nav a { border: 0; font-size: 14px; letter-spacing: .06em; color: var(--fret-mute); }
.masthead nav a[aria-current='page'], .masthead nav a:hover { color: var(--fret-ink); }
.masthead nav a[aria-current='page'] { border-bottom: 1.5px solid var(--fret-sig); }
.masthead .langslot { margin-left: auto; font-size: 13px; letter-spacing: .04em; }
.masthead .langslot a { border: 0; color: var(--fret-mute); }
.masthead .langslot a[aria-current='true'] { color: var(--fret-sig); }

/* ------------- the sticky fingerboard strip that rides on top of inner pages ---- */

.pos-strip {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--fret-paper);
  border-bottom: var(--fret-rule);
  display: flex;
  gap: 0;
  overflow-x: auto;
}
.pos-strip a, .pos-strip span.bandmark {
  flex: 1 0 auto;
  text-align: center;
  padding: 8px 16px;
  font-family: var(--fret-face-num);
  font-size: 12px;
  letter-spacing: .18em;
  border-right: var(--fret-rule);
  color: var(--fret-mute);
  border-bottom: 0;
}
.pos-strip a { border-bottom: 0; }
.pos-strip a:hover { color: var(--fret-sig); }
.pos-strip .bandmark { color: var(--fret-sig); border-bottom: 1.5px solid var(--fret-sig); }

/* ------------------------------------------------------------------ home matrix */

.board-stage { display: flex; gap: 0; align-items: stretch; border-bottom: var(--fret-rule); }
.board-pane { flex: 1 1 63%; padding: 26px 28px 30px; border-right: var(--fret-rule); min-width: 0; }
.roster-pane { flex: 1 1 37%; padding: 26px 28px 30px; min-width: 0; }

.stage-note { font-size: 15px; color: var(--fret-mute); margin: 0 0 18px; max-width: 62ch; }
.stage-note strong { color: var(--fret-ink); font-weight: 500; }

.fret-matrix {
  display: flex;
  border: var(--fret-rule);
  background: var(--fret-field);
  width: 100%;
}
.pos-band { flex: 1 1 0; min-width: 0; cursor: pointer; background: none; border: 0; padding: 0; display: block; }
.pos-band + .pos-band { border-left: 1px solid var(--fret-ink); }
.band-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.band-cell {
  position: relative;
  height: 34px;
  border-bottom: var(--fret-rule);
  border-right: var(--fret-rule);
}
.band-grid .band-cell:nth-child(3n) { border-right: 0; }
.band-grid .band-cell:nth-last-child(-n+3) { border-bottom: 0; }
.band-cell .dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 9px;
  height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border: 1.5px solid var(--fret-mute);
  border-radius: 50%;
}
.band-cell .dot-root { background: var(--fret-sig); border-color: var(--fret-sig); }
.band-cap {
  display: block;
  text-align: center;
  font-family: var(--fret-face-num);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--fret-mute);
  padding: 8px 0 0;
}
.pos-band.is-live .band-cell .dot-root, .pos-band:focus-visible .band-cell .dot-root { background: var(--fret-sig); }
.pos-band.is-live .band-cell .dot { border-color: var(--fret-sig); }
.pos-band.is-live .band-cap { color: var(--fret-sig); }
.fret-matrix.has-live .pos-band:not(.is-live) .band-cell .dot { border-color: var(--fret-grid); background: none; }
.fret-matrix.has-live .pos-band:not(.is-live) .band-cap { color: var(--fret-grid); }
.string-tags { display: flex; flex-direction: column; justify-content: space-between; padding-right: 6px; font-family: var(--fret-face-num); font-size: 10px; color: var(--fret-mute); }
.matrix-shell { display: flex; }
.matrix-shell .fret-matrix { flex: 1 1 auto; }
.matrix-foot { display: flex; justify-content: space-between; font-family: var(--fret-face-num); font-size: 10px; color: var(--fret-mute); padding-top: 6px; }

.roster-head { font-family: var(--fret-face-num); font-size: 11px; letter-spacing: .2em; color: var(--fret-mute); margin: 0 0 10px; }
.roster-group { border-top: var(--fret-rule); padding: 10px 0 14px; }
.roster-group[hidden] { display: none; }
.roster-group .r-band { font-family: var(--fret-face-num); font-size: 12px; letter-spacing: .18em; color: var(--fret-sig); display: block; margin-bottom: 6px; }
.entry-line { display: flex; align-items: baseline; gap: 10px; padding: 4px 0; border-bottom: 1px solid transparent; }
.entry-line a { border: 0; flex: 1 1 auto; }
.entry-line a:hover { border-bottom: 1px solid var(--fret-sig); }
.entry-line .pips { font-family: var(--fret-face-num); font-size: 10px; color: var(--fret-mute); letter-spacing: .12em; }
.pips-off { color: var(--fret-grid); }
.empty-note { color: var(--fret-mute); font-size: 14px; }

/* ------------------------------------------------------------------ index lists */

.sheet-head { padding: 40px 0 18px; border-bottom: 1px solid var(--fret-ink); }
.sheet-head h1 { font-size: 30px; margin-bottom: .35em; }
.sheet-head p { color: var(--fret-mute); max-width: 66ch; margin: 0 0 18px; }
.ledger { width: 100%; border-collapse: collapse; }
.ledger th, .ledger td { text-align: left; padding: 11px 10px 11px 0; border-bottom: var(--fret-rule); vertical-align: top; }
.ledger th { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .18em; color: var(--fret-mute); font-weight: 400; text-transform: uppercase; }
.ledger td.kind { font-family: var(--fret-face-num); font-size: 11px; color: var(--fret-mute); white-space: nowrap; }
.ledger td.stamp { font-size: 12px; color: var(--fret-mute); white-space: nowrap; }
.ledger tr:hover td { background: rgba(61, 90, 254, .045); }
.ledger .t-en { display: block; }
.ledger .t-zh { display: block; font-size: 13px; color: var(--fret-mute); font-family: var(--fret-face-body); }

.chiprow { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 30px; }
.chip { border: 1px solid var(--fret-grid); padding: 3px 10px; font-family: var(--fret-face-num); font-size: 11px; letter-spacing: .1em; color: var(--fret-mute); }
.chip:hover { border-color: var(--fret-sig); color: var(--fret-sig); }
.chip[aria-current='page'] { border-color: var(--fret-sig); color: var(--fret-sig); }

/* ------------------------------------------------------------------ entry page */

.plate-band { border-bottom: var(--fret-rule); padding: 24px 0 26px; overflow-x: auto; }
.plate-band svg { display: block; min-width: 520px; }
.entry-head { padding: 34px 0 6px; }
.entry-head h1 { font-size: 29px; max-width: 30ch; }
.entry-head .sub { font-size: 15px; color: var(--fret-mute); margin: 0 0 14px; }
.entry-head .zh-title { font-size: 17px; color: var(--fret-mute); margin: 0 0 18px; font-family: var(--fret-face-body); }
.entry-head .byline { font-size: 13px; color: var(--fret-mute); margin: 0 0 18px; }
.entry-head .byline a { color: var(--fret-ink); border-bottom-color: var(--fret-sig); }
.entry-head .byline a:hover, .entry-head .byline a:focus-visible { color: var(--fret-sig); border-bottom-color: var(--fret-sig); }
.entry-head .byline time { font-family: var(--fret-face-num); font-size: 12px; letter-spacing: .04em; }
.specline { display: flex; flex-wrap: wrap; gap: 0; border-top: var(--fret-rule); border-bottom: var(--fret-rule); margin-bottom: 26px; }
.specline div { flex: 1 1 150px; padding: 10px 14px 10px 0; border-right: var(--fret-rule); padding-left: 14px; }
.specline div:first-child { padding-left: 0; }
.specline div:last-child { border-right: 0; }
.specline dt { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .16em; color: var(--fret-mute); text-transform: uppercase; }
.specline dd { margin: 3px 0 0; font-size: 15px; }

.prose { padding-bottom: 40px; }
.prose h2 { font-size: 21px; margin-top: 2em; padding-top: .2em; }
.prose h2:first-of-type { margin-top: 1.2em; }
.prose p { margin: 0 0 1.05em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 20px; }
.prose li { margin-bottom: .4em; }
.prose ul li::marker { color: var(--fret-mute); }
.prose .practice-flag { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .18em; color: var(--fret-sig); display: block; margin-bottom: 4px; }

.tab-block { margin: 22px 0 30px; border-top: 1px solid var(--fret-ink); border-bottom: 1px solid var(--fret-ink); padding: 14px 0 10px; overflow-x: auto; }
.tab-block .tab-cap { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .16em; color: var(--fret-mute); margin: 0 0 8px; }
.tab-staff svg { display: block; max-width: 100%; height: auto; }
.tab-bar { cursor: pointer; }
.tab-bar.is-cue rect { fill: rgba(61, 90, 254, .08); }
.tab-bar.is-cue .tab-fret { fill: var(--fret-sig); }
.tab-bar.is-cue .barline, .tab-bar.is-cue .stem, .tab-bar.is-cue .flag { stroke: var(--fret-sig); }
.tab-hint { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .12em; color: var(--fret-mute); }
.tab-readout { min-height: 1.6em; }
.tab-block .tab-foot { font-size: 12px; color: var(--fret-mute); margin: 8px 0 0; font-family: var(--fret-face-num); }

.fingering { width: 100%; border-collapse: collapse; margin: 8px 0 30px; }
.fingering caption { text-align: left; font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .16em; color: var(--fret-mute); padding-bottom: 8px; }
.fingering th, .fingering td { border-bottom: var(--fret-rule); padding: 9px 10px 9px 0; text-align: left; }
.fingering th { font-family: var(--fret-face-num); font-size: 10px; letter-spacing: .14em; color: var(--fret-mute); font-weight: 400; }
.fingering td.fn { font-family: var(--fret-face-num); font-size: 13px; letter-spacing: .08em; }

.folds { border-top: solid var(--fret-ink); border-top-width: 1px; }
.folds details { border-bottom: var(--fret-rule); padding: 12px 0; }
.folds summary { cursor: pointer; font-family: var(--fret-face-display); font-size: 16px; }
.folds summary::marker { color: var(--fret-sig); }
.folds p { margin: 8px 0 0; max-width: var(--fret-measure); }

.callout { border-left: 1.5px solid var(--fret-sig); padding: 12px 0 12px 16px; margin: 26px 0; font-size: 15px; color: var(--fret-mute); }

.term-index { margin: 4px 0 40px; }
.term-row { border-bottom: var(--fret-rule); padding: 14px 0; display: grid; grid-template-columns: 190px 1fr; gap: 18px; }
.term-row h3 { margin: 0; font-size: 16px; }
.term-row h3 em { display: block; font-style: normal; font-size: 13px; color: var(--fret-mute); font-family: var(--fret-face-body); }
.term-row p { margin: 0; max-width: 62ch; }
@media (max-width: 680px) { .term-row { grid-template-columns: 1fr; gap: 4px; } }

/* ------------------------------------------------------------------ fret rail */

.fret-rail {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--fret-rail-w);
  height: 100vh;
  z-index: 5;
  background: var(--fret-paper);
  border-left: var(--fret-rule);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
  padding: 0;
  margin: 0;
  border-top: 0;
}
.fret-rail button {
  flex: 0 0 auto;
  height: 14px;
  margin: 0;
  padding: 0;
  border: 0;
  border-top: 1px solid var(--fret-grid);
  background: none;
  cursor: pointer;
  position: relative;
}
.fret-rail button:last-child { border-bottom: 1px solid var(--fret-grid); }
.fret-rail button::after {
  content: '';
  position: absolute;
  right: 3px;
  top: 50%;
  width: 4px;
  height: 1px;
  background: var(--fret-grid);
}
.fret-rail button.on::after { background: var(--fret-sig); width: 7px; }
.fret-rail button:hover::after { background: var(--fret-sig); width: 7px; }
.fret-rail .needle {
  position: absolute;
  right: 0;
  width: 9px;
  height: 1.5px;
  background: var(--fret-sig);
  transition: none;
}

/* ------------------------------------------------------------------ colophon */

.colophon { border-top: 1px solid var(--fret-ink); padding: 26px 0 46px; font-size: 13px; color: var(--fret-mute); }
.colophon .cols { display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; }
.colophon a { color: var(--fret-mute); border-bottom-color: var(--fret-grid); }
.colophon a:hover { color: var(--fret-sig); }
.colophon .legal-links { display: flex; gap: 16px; flex-wrap: wrap; }
.colophon .disclaimer { margin: 16px 0 0; padding-top: 12px; border-top: var(--fret-rule); max-width: 78ch; }

/* ------------------------------------------------------------------ responsive */

@media (max-width: 900px) {
  .board-stage { flex-direction: column; }
  .board-pane { border-right: 0; border-bottom: var(--fret-rule); }
  .masthead-in { padding: 12px 18px; gap: 12px; }
  .wrap { padding: 0 18px; }
  .specline div { flex-basis: 50%; }
}
@media (max-width: 560px) {
  body { font-size: 16px; padding-right: 12px; }
  :root { --fret-rail-w: 12px; }
  .band-cell { height: 28px; }
  .entry-head h1 { font-size: 23px; }
}

/* ------------------------------------------------------------------ print sheet */

@media print {
  :root { --fret-paper: #fff; --fret-grid: #999; --fret-mute: #444; --fret-sig: #000; }
  body { padding: 0; font-size: 11pt; }
  .masthead nav, .langslot, .fret-rail, .pos-strip, .chiprow, .colophon .legal-links { display: none !important; }
  .plate-band svg, .tab-block svg { filter: grayscale(1); }
  .board-stage { border: 0; }
  .entry-line .pips { color: #000; }
  a { border: 0; color: #000; }
}