:root {
  --bg: #f3efe6;
  --paper: #fffaf2;
  --ink: #1a1814;
  --muted: #5a5348;
  --line: #d4cbb8;
  --accent: #b8431f;
  --accent-deep: #8f3014;
  --teal: #1f5c52;
  --teal-soft: #dceae6;
  --staff: rgba(26, 24, 20, 0.06);
  --max: 64rem;
  --display: "Fraunces", "Source Serif 4", Georgia, serif;
  --font: "Source Sans 3", "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      var(--staff) 27px,
      var(--staff) 28px
    );
  line-height: 1.6;
}

a { color: var(--teal); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-deep); }

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* sticky academic nav */
header.site {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 250, 242, 0.92);
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  align-items: center;
  padding: 0.75rem 0;
}

.brand {
  font-family: var(--display);
  font-weight: 650;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
  letter-spacing: -0.02em;
}

.brand span {
  display: block;
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

nav.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  align-items: center;
}

nav.links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

nav.links a[aria-current="page"],
nav.links a:hover {
  color: var(--accent);
}

nav.links .icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 0.35rem;
  color: var(--ink);
  border: 1px solid transparent;
}

nav.links .icon-link.music-ai-link {
  width: auto;
  height: 1.7rem;
  padding: 0 0.35rem;
}

nav.links .icon-link:hover {
  color: var(--accent);
  border-color: var(--line);
  background: var(--paper);
}

nav.links .icon-link svg,
nav.links .icon-link img {
  width: 1.2rem;
  height: 1.2rem;
  display: block;
}

nav.links .icon-link.music-ai-link img {
  width: auto;
  height: 1.35rem;
}

/* paper hero */
.paper-hero {
  padding: 2.6rem 0 1.2rem;
  text-align: center;
}

.paper-hero h1 {
  font-family: var(--display);
  font-size: clamp(1.85rem, 4.2vw, 2.75rem);
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
  margin-bottom: 1.35rem;
}

.badges a img { height: 1.4rem; }

.authors {
  max-width: 42rem;
  margin: 0 auto 0.65rem;
  font-size: 0.95rem;
  font-weight: 550;
}

.authors a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.authors a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.authors sup { color: var(--muted); font-size: 0.7em; }

.affiliations {
  max-width: 40rem;
  margin: 0 auto;
  font-size: 0.88rem;
  color: var(--muted);
}

.affiliations a { color: var(--muted); }
.affiliations a:hover { color: var(--accent); }

.abstract {
  margin: 1.75rem auto 0;
  max-width: 44rem;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1.1rem 1.25rem 0.85rem;
}

.abstract h2 {
  margin: 0 0 0.5rem;
  font-family: var(--display);
  font-size: 1.15rem;
  text-align: center;
}

.abstract p {
  margin: 0;
  color: var(--ink);
  text-align: justify;
  hyphens: auto;
}

.note {
  margin: 1.25rem auto 0;
  max-width: 44rem;
  padding: 0.75rem 0.95rem;
  border-left: 3px solid var(--teal);
  background: var(--teal-soft);
  color: #16362f;
  font-size: 0.92rem;
  text-align: left;
}

section {
  padding: 1.75rem 0 0.5rem;
}

section h2 {
  margin: 0 0 0.55rem;
  font-family: var(--display);
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

section > p.lead {
  margin: 0 0 1rem;
  color: var(--muted);
}

.goal {
  margin: 1.5rem auto 0;
  max-width: 44rem;
  text-align: left;
}

.goal p {
  margin: 0 0 0.75rem;
  color: var(--ink);
  font-size: 1.02rem;
}

.page-guide {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

.page-guide li {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
}

.page-guide a {
  font-family: var(--display);
  font-weight: 650;
  font-size: 1.1rem;
  text-decoration: none;
}

.page-guide p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.plot-block {
  margin-top: 0.5rem;
}

.plot-fig {
  max-width: min(100%, 52rem);
  margin-inline: auto;
}

.arch {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.75rem;
  margin: 0.75rem 0 0.25rem;
}

.arch img {
  display: block;
  width: 100%;
  height: auto;
}

.clip audio.audio-error {
  outline: 1px solid var(--accent);
}

.caption {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.song {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1rem 1rem 0.85rem;
  margin: 0 0 1rem;
}

.song h3 {
  margin: 0 0 0.25rem;
  font-size: 1.02rem;
  font-family: var(--mono);
}

.song .meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.85rem;
}

.grid { display: grid; gap: 0.65rem; }

.clip {
  display: grid;
  gap: 0.2rem 0.75rem;
  grid-template-columns: minmax(8.5rem, 14rem) 1fr;
  align-items: center;
}

.clip-label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.clip label { font-size: 0.88rem; line-height: 1.25; }
.clip-note {
  font-size: 0.72rem;
  line-height: 1.3;
  color: var(--muted, #6b5e55);
  font-style: italic;
}
.clip audio { width: 100%; height: 2.1rem; }
.clip.missing label { color: var(--accent); }
.clip.missing::after {
  content: "rendering…";
  grid-column: 2;
  font-size: 0.8rem;
  color: var(--accent);
}

.table-wrap { overflow-x: auto; }

table.case {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--paper);
  border: 1px solid var(--line);
}

table.case th,
table.case td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.45rem;
  vertical-align: middle;
  text-align: left;
}

table.case th {
  background: #efe6d6;
  font-weight: 650;
  white-space: normal;
  min-width: 9.5rem;
  line-height: 1.25;
}

table.case .th-sub {
  display: block;
  margin-top: 0.2rem;
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--muted);
}

table.case audio {
  width: min(100%, 14rem);
  height: 2rem;
}

.ext-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: center;
  margin-top: 1.25rem;
  font-size: 0.92rem;
}

footer {
  margin: 2.75rem 0 2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.status {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .clip { grid-template-columns: 1fr; }
  nav.links { width: 100%; }
}