/* ============================================================
   FuseAlign — project page
   Palette & layout follow Descript's brand academic template
   (Red & Maroon ramps), cf. descriptinc.github.io/ATS and uvm-v2
   ============================================================ */

:root {
  --rec-red:     #F73B3B;
  --rec-red-dk:  #B81B1E;
  --red-50:      #FFE8DB;
  --light-peach: #FFD6C5;
  --peach:       #FF8969;
  --canvas:      #FFF8F4;
  --edit-maroon: #651A39;
  --maroon-900:  #390A1A;
  --neutral-50:  #F1EAED;
  --neutral-100: #E4DDE0;
  --neutral-200: #D1C7CB;
  --neutral-600: #715661;
  --screen-black:#110A0D;

  --bg:          #ffffff;
  --bg-sunken:   var(--neutral-50);
  --ink:         var(--screen-black);
  --ink-soft:    var(--neutral-600);
  --ink-faint:   #9c8890;
  --line:        var(--neutral-100);
  --accent:      var(--edit-maroon);
  --accent-2:    var(--rec-red);

  /* error buckets: the paper's 25 / 50 / 300 ms thresholds */
  --good-bg: #D9F0E0; --good-fg: #1E6B3F;
  --mid-bg:  #FFF1A6; --mid-fg:  #6B5500;
  --poor-bg: #FFD6C5; --poor-fg: #B81B1E;
  --bad-bg:  #F73B3B; --bad-fg:  #ffffff;
  --ref-bg:  #EDE3E8; --ref-fg:  var(--edit-maroon);

  --maxw: 960px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(57, 10, 26, .05), 0 10px 30px rgba(57, 10, 26, .07);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 18px/1.6 var(--font); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; cursor: default; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

section { padding: 56px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }
section.sunken { background: var(--canvas); }

h1, h2, h3, h4 { color: var(--ink); font-weight: 600; letter-spacing: -.01em; }
h2 { font-size: 30px; margin: 0 0 24px; padding-bottom: 8px; border-bottom: 2px solid var(--accent); display: inline-block; }
h3 { font-size: 22px; margin: 44px 0 16px; }
h4 { font-size: 17px; margin: 28px 0 10px; }
p { color: var(--ink); }
p.soft, li.soft { color: var(--ink-soft); }
em { color: var(--accent); font-style: italic; }
strong { font-weight: 600; }
code { font-family: var(--font-mono); font-size: .88em; background: var(--neutral-50); padding: 1px 5px; border-radius: 4px; }
.small { font-size: 14.5px; color: var(--ink-soft); }
.kbd { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; margin: 4px; border-radius: 999px;
  background: var(--rec-red); color: #fff; font-size: 16px; font-weight: 600; letter-spacing: .01em;
  border: 1px solid transparent; transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}
.btn:hover { background: var(--rec-red-dk); text-decoration: none; }
.btn--sm { padding: 7px 14px; font-size: 14px; }
.btn--ghost { background: transparent; color: var(--edit-maroon); border-color: var(--neutral-200); }
.btn--ghost:hover { background: var(--canvas); color: var(--edit-maroon); border-color: var(--edit-maroon); }
.btn--ghost[aria-pressed="true"] { background: var(--light-peach); border-color: transparent; color: var(--rec-red-dk); }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; }

/* ---------- Header ---------- */
.site-header { background: var(--canvas); padding: 64px 0 36px; text-align: center; }
.eyebrow { font-family: var(--font-mono); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--rec-red); margin: 0 0 14px; }
.site-header h1 { font-size: clamp(42px, 7vw, 64px); line-height: 1.05; margin: 0 0 14px; }
.subtitle { font-size: 21px; color: var(--ink-soft); margin: 0 auto 20px; max-width: 900px; }
.authors { font-size: 19px; color: var(--ink-soft); margin: 0 0 6px; line-height: 1.5; }
.authors span { display: inline-block; margin: 0 8px; }
.affiliations { font-size: 16px; color: var(--edit-maroon); font-weight: 600; margin-bottom: 18px; }
.header__cta { display: flex; gap: 4px; justify-content: center; flex-wrap: wrap; }

/* ---------- Figures ---------- */
figure { margin: 24px 0; }
figure.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 20px 14px; }
figure.panel.paper-fig { margin: 28px 0; }
figure.panel.paper-fig img { display: block; width: 100%; height: auto; }
figure.panel.task { margin: 28px 0; padding: 14px 16px 10px; }
figure svg { display: block; width: 100%; height: auto; }
figcaption { font-size: 14.5px; color: var(--ink-soft); margin-top: 10px; line-height: 1.5; }
figcaption b { color: var(--ink); }
.cols { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; align-items: start; }
.cols--even { grid-template-columns: 1fr 1fr; }
.col-text p { color: var(--ink-soft); }
.col-text p strong { color: var(--ink); }

.chart-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13px; color: var(--ink-soft); margin: 8px 0 0; }
.chart-legend .sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 6px; }
.chart-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }

/* ---------- Metric list ---------- */
.metric-list { padding-left: 1.3em; margin: 0 0 8px; }
.metric-list li { color: var(--ink-soft); margin-bottom: 12px; line-height: 1.55; }
.metric-list li strong { color: var(--ink); }
.metric-list li::marker { color: var(--accent); }

/* ---------- Tables ---------- */
.tbl { margin: 18px 0 8px; }
.tbl__title { font-weight: 600; font-size: 15px; color: var(--ink); margin: 0 0 6px; }
.tbl__scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: #fff; }
table.paper { border-collapse: collapse; width: 100%; font-size: 13.5px; font-variant-numeric: tabular-nums; }
table.paper th, table.paper td { padding: 6px 10px; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--neutral-50); }
table.paper th { font-weight: 600; color: var(--ink-soft); background: var(--canvas); border-bottom: 1px solid var(--line); }
table.paper td.lab, table.paper th.lab { text-align: left; color: var(--ink); }
table.paper tr.group-start td { border-top: 2px solid var(--line); }
table.paper td[rowspan] { vertical-align: top; font-weight: 600; }
table.paper .ci { font-size: 10.5px; color: var(--ink-faint); margin-left: 1px; }
table.paper .better { color: #1E6B3F; font-weight: 600; }
table.paper .worse { color: var(--rec-red-dk); font-weight: 600; }
table.paper b { color: var(--ink); }
table.paper tr.hl td { background: var(--red-50); }
.tbl__note { font-size: 13.5px; color: var(--ink-soft); margin: 8px 2px 0; line-height: 1.5; }
/* ---------- Metric buckets legend ---------- */
.legend { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 13.5px; color: var(--ink-soft); margin: 10px 0 18px; align-items: center; }
.legend .swatch { display: inline-block; width: 14px; height: 14px; border-radius: 4px; vertical-align: -2px; margin-right: 6px; border: 1px solid rgba(0,0,0,.08); }

/* ---------- Example cards (evaluation section) ---------- */
.examples { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 8px; }
.example { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); text-align: left; }
.example__kind { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--rec-red); margin-bottom: 6px; }
.example__ctx { font-size: 18px; line-height: 1.5; margin: 0 0 10px; color: var(--ink-soft); }
.example__ctx b { color: var(--rec-red-dk); background: var(--light-peach); border-radius: 5px; padding: 0 5px; }
.example .wavewrap { height: 110px; }
.example__spans { position: relative; height: 34px; margin-top: 4px; }
.example__spans .span { position: absolute; top: 0; height: 14px; border-radius: 3px; font-size: 10.5px; line-height: 14px; padding: 0 4px; white-space: nowrap; overflow: hidden; }
.example__spans .span.ref { background: var(--ref-bg); color: var(--ref-fg); border: 1px solid var(--edit-maroon); }
.example__spans .span.sys { top: 18px; background: var(--light-peach); color: var(--rec-red-dk); border: 1px solid var(--rec-red); }
.example__nums { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin: 10px 0 12px; }
.example__nums .chip { display: flex; justify-content: space-between; gap: 8px; border-radius: 8px; padding: 4px 10px; }
.chip { font-family: var(--font-mono); font-size: 12px; background: var(--neutral-50); color: var(--ink-soft); border-radius: 999px; padding: 3px 9px; }
.chip.good { background: var(--good-bg); color: var(--good-fg); }
.chip.bad { background: var(--poor-bg); color: var(--poor-fg); }
.example__play { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.example__play .btn { margin: 0; justify-content: center; }
.example__play .btn.wide { grid-column: 1 / -1; }
.example__verdict { font-size: 13.5px; color: var(--ink-soft); margin: 12px 0 0; line-height: 1.5; }

/* ---------- Waveform + playhead (shared) ---------- */
.wavewrap { position: relative; height: 96px; background: var(--canvas); border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.wavewrap canvas { display: block; width: 100%; height: 100%; }
.playhead { position: absolute; top: 0; bottom: 0; width: 2px; background: var(--rec-red); opacity: 0; pointer-events: none; transition: opacity .15s; }
.selband { position: absolute; top: 0; bottom: 0; background: color-mix(in srgb, var(--edit-maroon) 14%, transparent); border-left: 1px solid var(--edit-maroon); border-right: 1px solid var(--edit-maroon); opacity: 0; pointer-events: none; }
.wavewrap .mark { position: absolute; top: 0; bottom: 0; pointer-events: none; }
.wavewrap .mark.ref { background: color-mix(in srgb, var(--edit-maroon) 12%, transparent); border-left: 2px solid var(--edit-maroon); border-right: 2px solid var(--edit-maroon); }
.wavewrap .mark.sys { border-left: 2px dashed var(--rec-red); border-right: 2px dashed var(--rec-red); }

/* ---------- Demo cards (alignment comparison) ---------- */
.demos { display: flex; flex-direction: column; gap: 18px; margin-top: 8px; }
.demo { background: #fff; border: 1px solid color-mix(in srgb, var(--rec-red) 28%, var(--line)); border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow); text-align: left; }
.demo__head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.demo__title { font-weight: 600; font-size: 15px; color: var(--ink-soft); }
.demo__title b { color: var(--ink); }
.demo__controls { display: flex; gap: 4px; flex-wrap: wrap; }
.demo__controls .btn { margin: 0; }
.transcript { font-size: 17px; line-height: 1.7; color: var(--ink-soft); margin: 0 0 10px; }
.transcript span { border-radius: 4px; padding: 0 2px; }
.transcript span.on { background: var(--light-peach); color: var(--rec-red-dk); }
.tracks { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
.track { display: grid; grid-template-columns: 150px 1fr; gap: 10px; align-items: stretch; }
.track-label { font-size: 13px; line-height: 1.25; color: var(--ink); padding-top: 4px; }
.track-label b { display: block; font-weight: 600; }
.track-label i { display: block; font-style: normal; color: var(--ink-faint); font-size: 11.5px; }
.track-label .chips { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 3px; }
.track-label .chips .chip { font-size: 10.5px; padding: 1px 6px; }
.track-lane { position: relative; height: 30px; background: var(--canvas); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.track.truth .track-lane { background: #fff; }
.word { position: absolute; top: 3px; bottom: 3px; border-radius: 4px; font-size: 11px; line-height: 22px; padding: 0 4px; overflow: hidden; white-space: nowrap; text-overflow: clip; border: 1px solid transparent; transition: box-shadow .12s; }
.word.truth { background: var(--ref-bg); color: var(--ref-fg); border-color: color-mix(in srgb, var(--edit-maroon) 40%, transparent); }
.word.g-good { background: var(--good-bg); color: var(--good-fg); }
.word.g-mid { background: var(--mid-bg); color: var(--mid-fg); }
.word.g-bad { background: var(--bad-bg); color: var(--bad-fg); }
.word.g-none { background: transparent; color: var(--ink-faint); border: 1px dashed var(--neutral-200); text-align: center; }
.word.sel { box-shadow: 0 0 0 2px var(--rec-red); z-index: 2; }
.readout { margin-top: 10px; font-size: 13.5px; color: var(--ink-soft); min-height: 28px; }
.readout table { border-collapse: collapse; width: auto; font-variant-numeric: tabular-nums; }
.readout th, .readout td { padding: 4px 12px 4px 0; text-align: left; border-bottom: 1px solid var(--neutral-50); }
.readout th { color: var(--ink); font-weight: 600; }
.readout td.err { font-weight: 600; }
.readout .play { border: 1px solid var(--neutral-200); background: #fff; color: var(--edit-maroon); border-radius: 999px; padding: 1px 9px; font-size: 12px; }
.readout .play:hover { border-color: var(--rec-red); color: var(--rec-red-dk); }

/* ---------- Credits ---------- */
.credits { font-size: 13.5px; color: var(--ink-soft); line-height: 1.55; }
.credits li { margin-bottom: 6px; }
.credits code { font-size: 11.5px; }

/* ---------- BibTeX ---------- */
.bib { position: relative; text-align: left; }
.bib__copy { position: absolute; top: 12px; right: 12px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--neutral-200); background: #fff; color: var(--edit-maroon); font-size: 13px; font-weight: 600; transition: .2s; }
.bib__copy:hover { border-color: var(--rec-red); color: var(--rec-red-dk); }
.bib__copy.copied { background: var(--light-peach); border-color: transparent; }
pre { background: var(--neutral-50); border: 1px solid var(--line); border-radius: 6px; padding: 18px; overflow-x: auto; font-size: 14px; line-height: 1.55; font-family: var(--font-mono); color: var(--ink); }

/* ---------- Footer ---------- */
footer { padding: 36px 0; text-align: center; }
footer .footer-logo { margin-bottom: 14px; line-height: 0; }
footer .footer-logo img { display: inline-block; width: auto; height: 22px; max-height: 22px; max-width: 120px; opacity: .75; }
footer .muted { color: var(--ink-faint); font-size: 14px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
[hidden] { display: none !important; }
.empty-note { font-size: 14.5px; color: var(--ink-faint); border: 1px dashed var(--neutral-200); border-radius: var(--radius-sm); padding: 14px 16px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .cols, .examples { grid-template-columns: 1fr; }
  .track { grid-template-columns: 110px 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .container { padding: 0 18px; }
  section { padding: 40px 0; }
  h2 { font-size: 24px; margin-bottom: 20px; }
  h3 { font-size: 19px; margin: 32px 0 14px; }
  .site-header { padding: 44px 0 28px; }
  .subtitle { font-size: 18px; }
  .authors { font-size: 16px; }
  .authors span { margin: 0 5px; }
  .btn { padding: 10px 18px; font-size: 15px; }
  .track { grid-template-columns: 1fr; gap: 2px; }
  .track-label { display: flex; gap: 8px; align-items: baseline; }
  .track-label .chips { display: none; }
  pre { font-size: 12.5px; padding: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
}