/* ===========================================================
   DramaPara — Minimalist "lab instrument" tech style
   Light surface · ink type · electric-blue signal · mono data
   =========================================================== */

:root {
  --paper: #fafbfc;
  --surface: #ffffff;
  --tint: #f3f6fb;
  --line: #e4e8ef;
  --line-strong: #ccd4e0;
  --ink: #0b1220;
  --ink-soft: #2a3344;
  --muted: #5b6678;
  --faint: #8a93a4;
  --accent: #2e5bff;
  --accent-press: #1d44d8;
  --accent-wash: rgba(46, 91, 255, 0.07);
  --signal: #19c3f5;

  /* keyword-annotation palette (used in Audio Samples Part 2 / 3) */
  --hl-emo: #b8560b;
  --hl-emo-wash: rgba(201, 96, 16, 0.12);
  --hl-shift: #0b7fa3;
  --hl-shift-wash: rgba(18, 156, 198, 0.13);
  --hl-pitch: #7b3fb0;
  --hl-pitch-wash: rgba(123, 63, 176, 0.12);
  --hl-volume: #2f8a52;
  --hl-volume-wash: rgba(47, 138, 82, 0.14);
  --hl-pace: #c02a6b;
  --hl-pace-wash: rgba(192, 42, 107, 0.12);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;

  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, Segoe UI, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  width: min(1120px, 90vw);
  margin: 0 auto;
}
.narrow {
  width: min(780px, 90vw);
}

/* ---------- shared eyebrow / mono label ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

/* =================== top nav =================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 251, 252, 0.82);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.16em;
  font-size: 14px;
  color: var(--ink);
}
.brand:hover {
  text-decoration: none;
}
.brand-mark {
  width: 18px;
  height: 18px;
  display: block;
}
.brand-mark rect {
  fill: var(--accent);
}
.nav-links {
  display: flex;
  gap: 26px;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
}
.nav-links a:hover {
  color: var(--ink);
  text-decoration: none;
}

/* =================== hero =================== */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
/* faint blueprint dot-grid texture, hero only */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--line-strong) 1px, transparent 1.4px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
  opacity: 0.5;
  pointer-events: none;
}
.hero-wrap {
  position: relative;
  text-align: center;
  padding: 78px 0 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 6px 14px;
}
.chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-wash);
}

.hero h1 {
  margin: 22px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(46px, 9vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.hero .subtitle {
  margin: 18px auto 0;
  max-width: 760px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2.3vw, 23px);
  line-height: 1.42;
  color: var(--ink-soft);
}

/* signature: audio waveform band */
.wave {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 78px;
  margin: 34px auto 6px;
  width: min(680px, 88vw);
}
.wave span {
  flex: 0 0 auto;
  width: 3px;
  height: var(--h, 30%);
  border-radius: 3px;
  background: linear-gradient(180deg, var(--signal), var(--accent));
  opacity: 0.85;
  transform-origin: center;
  animation: wavepulse var(--dur, 2.4s) ease-in-out var(--delay, 0s) infinite;
}
@keyframes wavepulse {
  0%, 100% { transform: scaleY(0.42); }
  50% { transform: scaleY(1); }
}

.authors {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  font-weight: 500;
  padding: 11px 20px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}
.btn:hover {
  text-decoration: none;
  border-color: var(--accent);
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-press);
  border-color: var(--accent-press);
}

/* instrument spec strip */
.specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 56px 0 0;
  border-top: 1px solid var(--line);
}
.spec {
  padding: 26px 18px 30px;
  border-right: 1px solid var(--line);
}
.spec:last-child {
  border-right: none;
}
.spec-val {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.spec-val .accent {
  color: var(--accent);
}
.spec-label {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

/* =================== sections =================== */
.section {
  padding: 84px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 70px;
}
.section.alt {
  background: var(--tint);
}
.section-head {
  margin: 0 0 36px;
}
.section-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.015em;
  color: var(--ink);
}
.lead {
  color: var(--muted);
  font-size: 16px;
  max-width: 720px;
  margin: 0 0 8px;
}

/* abstract */
.abstract-body {
  font-size: 18px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}
.abstract-body strong {
  color: var(--ink);
  font-weight: 600;
}
.abstract-body .mark {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

/* =================== figures =================== */
.figure-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 14px;
  margin-top: 22px;
}
.figure-cap {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 4px 6px 14px;
}
.figure-cap .idx {
  color: var(--accent);
}
.figure-wrap {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  padding: 18px;
}
.pdf-figure {
  display: block;
  width: 100%;
  height: auto;
}
.figure-half {
  width: 64%;
  margin: 0 auto;
}

/* =================== audio =================== */
.audio-block {
  margin-top: 44px;
}
.audio-block:first-of-type {
  margin-top: 8px;
}
.block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.block-head .part {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.block-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 21px;
  color: var(--ink);
}

.audio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 20px;
}
.audio-grid.cols-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.audio-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.audio-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 6px 22px -16px rgba(11, 18, 32, 0.4);
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 13px;
}
.card-id {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  white-space: nowrap;
}
.tag.ours {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-wash);
}

audio {
  width: 100%;
  margin: 2px 0 4px;
}

/* labelled key/value rows for transcript + descriptions */
.kv {
  margin-top: 14px;
  padding-left: 13px;
  border-left: 2px solid var(--line-strong);
}
.kv-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 3px;
}
.kv-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--ink-soft);
}
.kv.gt {
  border-color: var(--accent);
}
.kv.gt .kv-label {
  color: var(--accent);
}
.kv.after {
  border-color: var(--accent);
}
.kv.after .kv-label {
  color: var(--accent);
}
.kv.before .kv-label {
  color: var(--muted);
}

/* ---- keyword annotations inside descriptions ---- */
.hl {
  border-radius: 4px;
  padding: 0 3px;
  font-weight: 600;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.hl-emo {
  color: var(--hl-emo);
  background: var(--hl-emo-wash);
}
.hl-shift {
  color: var(--hl-shift);
  background: var(--hl-shift-wash);
}
.hl-pitch {
  color: var(--hl-pitch);
  background: var(--hl-pitch-wash);
}
.hl-volume {
  color: var(--hl-volume);
  background: var(--hl-volume-wash);
}
.hl-pace {
  color: var(--hl-pace);
  background: var(--hl-pace-wash);
}
.hl-vague {
  color: var(--muted);
  text-decoration: underline dotted var(--line-strong);
  text-underline-offset: 3px;
}

/* color key explaining what the annotations mean */
.hl-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 4px 0 18px;
}
.hl-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.hl-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex: none;
}
.hl-dot.emo {
  background: var(--hl-emo);
}
.hl-dot.shift {
  background: var(--hl-shift);
}
.hl-dot.pitch {
  background: var(--hl-pitch);
}
.hl-dot.volume {
  background: var(--hl-volume);
}
.hl-dot.pace {
  background: var(--hl-pace);
}
.hl-dot.vague {
  height: 8px;
  border-radius: 0;
  background: transparent;
  border-bottom: 2px dotted var(--line-strong);
}

/* short plain-language note that frames a sample block */
.block-note {
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--muted);
  max-width: 760px;
  margin: 2px 0 14px;
  padding-left: 13px;
  border-left: 2px solid var(--line);
}
.block-note strong {
  color: var(--ink-soft);
  font-weight: 600;
}

/* =================== sources =================== */
.sources {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.source {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 8px 13px;
  transition: border-color 0.16s ease, color 0.16s ease;
}
.source:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.source .dot {
  color: var(--accent);
  margin-right: 7px;
}

/* =================== footer =================== */
.footer {
  padding: 30px 0 44px;
  background: var(--paper);
}
.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.footer p,
.footer a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0;
}
.footer a:hover {
  color: var(--accent);
}

/* =================== scroll reveal =================== */
.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js .reveal.in {
  opacity: 1;
  transform: none;
}

/* =================== responsive =================== */
@media (max-width: 820px) {
  .nav-links {
    gap: 16px;
  }
  .nav-links a {
    font-size: 11px;
  }
  .specs {
    grid-template-columns: repeat(2, 1fr);
  }
  .spec:nth-child(even) {
    border-right: none;
  }
  .spec:nth-child(1),
  .spec:nth-child(2) {
    border-bottom: 1px solid var(--line);
  }
  .audio-grid.cols-three {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 60px 0;
  }
  .figure-half {
    width: 100%;
  }
}

@media (max-width: 540px) {
  .nav-links {
    display: none;
  }
}

/* =================== motion preference =================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .wave span {
    animation: none;
    transform: scaleY(0.8);
  }
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn:hover {
    transform: none;
  }
}

.figure-desc {
  margin: 14px 6px 4px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}