:root {
  --bg: #0b1014;
  --bg-2: #121920;
  --bg-3: #1a232c;
  --bg-4: #232d38;
  --line: rgba(226, 196, 160, 0.14);
  --line-strong: rgba(226, 196, 160, 0.28);
  --ink: #f0e8dc;
  --ink-dim: #b7ae9f;
  --mute: #7e776c;
  --copper: #e28a4a;
  --copper-2: #f0b07a;
  --sea: #3fbeb4;
  --sea-2: #7ed9d0;
  --rose: #e07a7a;
  --good: #7ecf8a;
  --max: 760px;
  --wide: 1080px;
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Source Sans 3", "Source Sans Pro", "Helvetica Neue", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 18px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 50% at 10% -10%, rgba(226, 138, 74, 0.12), transparent 55%),
    radial-gradient(50% 40% at 100% 0%, rgba(63, 190, 180, 0.08), transparent 50%);
  z-index: 0;
}

a { color: var(--copper-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }

.wrap { width: min(var(--max), calc(100% - 2.4rem)); margin: 0 auto; }
.wrap-wide { width: min(var(--wide), calc(100% - 2.4rem)); margin: 0 auto; }

/* ---- nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: rgba(11, 16, 20, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  width: min(var(--wide), calc(100% - 2.4rem));
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  min-height: 56px;
}

.brand {
  flex: 0 0 auto;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 0.15rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  flex: 0 0 auto;
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 0.86rem;
  padding: 0.45rem 0.65rem;
  border-radius: 999px;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--ink);
  background: rgba(226, 138, 74, 0.12);
}

/* ---- hero ---- */
.hero { position: relative; z-index: 1; padding: 5.5rem 0 3.2rem; }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--copper-2);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.kicker::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 10px var(--copper);
}

.hero h1 {
  margin: 0.85rem 0 0.4rem;
  font-family: var(--serif);
  font-size: clamp(2.6rem, 6.4vw, 4.8rem);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.hero h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--copper-2);
}

.lede {
  max-width: 40rem;
  margin: 1rem 0 0;
  color: var(--ink-dim);
  font-size: 1.18rem;
  font-weight: 300;
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: 2.4rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.meta h3 {
  margin: 0 0 0.4rem;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.meta p { margin: 0; color: var(--ink-dim); font-size: 0.95rem; line-height: 1.5; }

/* ---- section cards ---- */
.jump {
  position: relative;
  z-index: 1;
  padding: 0 0 3.5rem;
}

.jump-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.jump a {
  display: block;
  padding: 1.15rem 1.1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg-2);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

.jump a:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.jump .n {
  color: var(--copper);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.jump h3 {
  margin: 0.45rem 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
}

.jump p { margin: 0; color: var(--mute); font-size: 0.9rem; }

/* ---- article ---- */
.section {
  position: relative;
  z-index: 1;
  padding: 3.4rem 0 1.2rem;
}

.section h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.03em;
}

.section h3 {
  margin: 2rem 0 0.6rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
}

.section h4 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 500;
}

.section p { margin: 0 0 1rem; color: var(--ink-dim); }
.section p.lead { color: var(--ink); font-size: 1.12rem; }

.pull {
  margin: 1.8rem 0;
  padding: 1.2rem 0 1.2rem 1.2rem;
  border-left: 3px solid var(--copper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.35rem;
  font-style: italic;
  line-height: 1.4;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 1.6rem 0 2rem;
}

.stat {
  padding: 1rem 1rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg-2);
}

.stat b {
  display: block;
  color: var(--copper-2);
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.stat span { color: var(--mute); font-size: 0.86rem; }

/* ---- listen widget ---- */
.panel {
  margin: 1.4rem 0 1.8rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent 40%), var(--bg-2);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.panel-head h3 { margin: 0; font-size: 1.2rem; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip, .btn {
  border: 1px solid var(--line);
  background: var(--bg-3);
  color: var(--ink-dim);
  font: 500 0.82rem/1 var(--sans);
  padding: 0.55rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
}

.chip.active, .btn.primary {
  border-color: transparent;
  background: var(--copper);
  color: #1a1008;
}

.btn:hover, .chip:hover { color: var(--ink); }
.btn.primary:hover { color: #1a1008; filter: brightness(1.05); }
.btn:disabled, .chip:disabled { opacity: 0.4; cursor: not-allowed; }

.scoreline {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.player {
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg);
}

.player.revealed-real { border-color: rgba(126, 207, 138, 0.55); }
.player.revealed-synth { border-color: rgba(224, 122, 122, 0.5); }

.player-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.player-label {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.play {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: var(--sea);
  color: #08201e;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.play.playing { background: var(--copper); color: #1a1008; }

.wave {
  display: block;
  width: 100%;
  height: 56px;
  border-radius: 8px;
  background: var(--bg-3);
}

.guess-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.transcript {
  margin-top: 0.95rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  background: var(--bg);
  color: var(--ink-dim);
  font-size: 0.95rem;
}

.transcript summary { cursor: pointer; color: var(--copper-2); }

.verdict {
  display: none;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  background: var(--bg-3);
}

.verdict.show { display: block; }
.verdict.ok { box-shadow: inset 3px 0 0 var(--good); }
.verdict.no { box-shadow: inset 3px 0 0 var(--rose); }

/* compare */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
}

#mfcc { margin-top: 1.8rem; }

.mfcc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 1.1rem 0 0.4rem;
}

.mfcc-card {
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg);
}

.mfcc-plot {
  display: block;
  width: 100%;
  height: 420px;
  border-radius: 8px;
  background: var(--bg-3);
}

.note .mono {
  font-family: var(--mono);
  font-size: 0.84em;
}

.select {
  width: min(100%, 420px);
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--ink);
  font: 400 0.95rem var(--sans);
}

/* charts */
.bars { display: grid; gap: 0.55rem; margin: 1rem 0 1.4rem; }

.bar-row {
  display: grid;
  grid-template-columns: 9.5rem 1fr 3.2rem;
  gap: 0.7rem;
  align-items: center;
}

.bar-row span { color: var(--ink-dim); font-size: 0.9rem; }
.bar-row b { font-family: var(--mono); font-size: 0.82rem; font-weight: 500; text-align: right; }

.track {
  height: 10px;
  border-radius: 999px;
  background: var(--bg-4);
  overflow: hidden;
}

.fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--copper), var(--copper-2));
}

.fill.sea { background: linear-gradient(90deg, #2a8f88, var(--sea-2)); }
.fill.xvec { background: linear-gradient(90deg, #3d6f9a, #8ec0e0); }
.fill.mute { background: #5c6570; }
.fill.f5 { background: linear-gradient(90deg, #8a5a4a, #c4907c); }

.score-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  color: var(--ink-dim);
  font-size: 0.82rem;
}

.score-legend .dot {
  display: inline-block;
  width: 0.65rem;
  height: 0.65rem;
  margin-right: 0.4rem;
  border-radius: 999px;
  vertical-align: -0.05rem;
}

.dot.sea { background: var(--sea); }
.dot.xvec { background: #6ea8cc; }
.dot.chat { background: var(--copper); }
.dot.xtts { background: #5c6570; }
.dot.f5 { background: #c4907c; }

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 1.8rem;
  margin: 0.4rem 0 1.5rem;
}

.score-panel .corpus-bars {
  display: grid;
  gap: 0.7rem;
}

.corpus-row {
  display: grid;
  grid-template-columns: 6.6rem 1fr;
  gap: 0.5rem;
  align-items: center;
}

.corpus-row span {
  color: var(--ink-dim);
  font-size: 0.8rem;
}

.corpus-row.is-mean {
  padding-top: 0.35rem;
  border-top: 1px solid var(--line);
}

.corpus-row.is-mean span { color: var(--mute); }

.group {
  display: grid;
  gap: 2px;
}

.mini-track {
  height: 8px;
  border-radius: 999px;
  background: var(--bg-4);
  overflow: hidden;
}

.score-panel .fill {
  width: calc(var(--v) / var(--scale) * 100%);
}

.table-wrap { overflow-x: auto; margin: 1.1rem 0 1.5rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th, td {
  padding: 0.5rem 0.55rem;
  border-bottom: 1px solid var(--line);
  text-align: right;
}

th:first-child, td:first-child { text-align: left; color: var(--ink); }
th { color: var(--mute); font-weight: 500; }
td { color: var(--ink-dim); font-family: var(--mono); font-size: 0.8rem; }

.note { color: var(--mute); font-size: 0.88rem; }

.pipe {
  display: grid;
  grid-template-columns: 1.15fr auto 0.9fr auto 1.15fr;
  gap: 0.7rem;
  align-items: stretch;
}

.pipe-col {
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.pipe-col.hot {
  border-color: rgba(63, 190, 180, 0.55);
  box-shadow: 0 0 0 1px rgba(63, 190, 180, 0.18);
}

.pipe-kicker {
  margin-bottom: 0.7rem;
  color: var(--copper-2);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pipe-label {
  margin: 0.85rem 0 0.4rem;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pipe-copy {
  margin: 0 0 0.9rem;
  color: var(--ink-dim);
  font-size: 0.92rem;
}

.pipe-target, .pipe-asr {
  margin: 0 0 0.85rem;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.55;
}

.pipe-asr .leak {
  color: #1a1008;
  background: var(--rose);
  border-radius: 4px;
  padding: 0 0.25em;
}

.pipe-arrow {
  display: grid;
  place-items: center;
  color: var(--mute);
  font-size: 1.4rem;
}

.words {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.word {
  border: 1px solid var(--line);
  background: var(--bg-3);
  color: var(--ink);
  font: 500 0.82rem/1.2 var(--sans);
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  cursor: pointer;
}

.word:hover { color: var(--ink); border-color: var(--line-strong); }
.word.picked { border-color: var(--sea); color: var(--sea-2); }
.word.dirty {
  border-color: rgba(224, 122, 122, 0.7);
  background: rgba(224, 122, 122, 0.16);
  color: #f3c4c4;
}

.pipe-field {
  display: grid;
  gap: 0.3rem;
  margin: 0.75rem 0;
  color: var(--mute);
  font-size: 0.8rem;
}

.pipe-field[hidden] { display: none; }

.pipe-field .select { width: 100%; }

#pipe-run { margin-top: 0.4rem; }
#pipe-speak { margin-top: 0.15rem; }

.footer {
  position: relative;
  z-index: 1;
  margin-top: 3rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .jump-grid, .stats, .compare-grid { grid-template-columns: 1fr 1fr; }
  .mfcc-grid { grid-template-columns: 1fr; }
  .meta { grid-template-columns: 1fr; }
  .pipe { grid-template-columns: 1fr; }
  .pipe-arrow { transform: rotate(90deg); height: 1.2rem; }
}

@media (max-width: 700px) {
  .pair, .jump-grid, .stats, .compare-grid, .score-grid { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 1fr; gap: 0.25rem; }
  .bar-row b { text-align: left; }
  .corpus-row { grid-template-columns: 1fr; gap: 0.2rem; }
}