*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: #1a1a2e;
  background: #fff;
  padding: 0 1rem 4rem;
}

a { color: #C0392B; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 900px; margin: 0 auto; }

/* ── Header ── */
header { border-bottom: 2px solid #C0392B; padding: 2rem 0 1.2rem; }
header h1 { font-size: 1.55rem; font-weight: 700; line-height: 1.3; margin-bottom: .5rem; }
.authors { font-size: .9rem; color: #444; margin-bottom: .8rem; }
.subtitle { font-size: .85rem; color: #666; margin-bottom: 1rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.btn {
  display: inline-block;
  padding: .35rem .9rem;
  border: 1.5px solid #C0392B;
  border-radius: 4px;
  font-size: .8rem;
  font-weight: 600;
  color: #C0392B;
  background: #fff;
  cursor: pointer;
}
.btn:hover { background: #C0392B; color: #fff; text-decoration: none; }

/* ── Sections ── */
section { margin-top: 2.5rem; }
h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 1rem;
     padding-bottom: .3rem; border-bottom: 1px solid #ddd; }
h3 { font-size: 1rem; font-weight: 700; margin: 1.4rem 0 .6rem; }

/* ── Overview ── */
.overview { background: #fdf5f5; border-left: 4px solid #C0392B; padding: 1rem 1.2rem; border-radius: 0 4px 4px 0; }

/* ── Research questions ── */
.rq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 640px) { .rq-grid { grid-template-columns: 1fr; } }
.rq-card { border: 1px solid #e8d0d0; border-radius: 6px; padding: 1rem; }
.rq-card strong { display: block; margin-bottom: .4rem; color: #C0392B; font-size: .9rem; }
.rq-card p { font-size: .88rem; color: #333; }
.rq-card .highlight { font-weight: 700; color: #C0392B; }

/* ── Taxonomy table ── */
.taxonomy-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.taxonomy-table th { background: #fdf0f0; text-align: left; padding: .45rem .7rem;
                      border: 1px solid #e0cccc; font-weight: 600; }
.taxonomy-table td { padding: .4rem .7rem; border: 1px solid #ddd; }
.taxonomy-table tr:nth-child(even) td { background: #fdf8f8; }
.ipa { font-family: "Noto Serif", Georgia, serif; font-size: .95em; }

/* ── Audio players ── */
.marker-section { margin-top: 1.8rem; }
.marker-section h3 { color: #1a1a2e; }
.listening-hint { font-size: .83rem; color: #555; margin-bottom: .9rem;
                  background: #f5f5f5; padding: .5rem .8rem; border-radius: 4px; }
.class-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.class-col h4 { font-size: .9rem; font-weight: 700; margin-bottom: .6rem; color: #C0392B; }
.clip { border: 1px solid #ddd; border-radius: 6px; overflow: hidden; margin-bottom: .7rem; background: #fff; }
.clip img { width: 100%; display: block; }
.clip-meta { padding: .4rem .6rem; display: flex; flex-direction: column; gap: .3rem; }
.clip-meta audio { width: 100%; height: 32px; }
.clip-meta span { font-size: .78rem; color: #555; }

/* ── Ablation table ── */
.table-scroll { overflow-x: auto; margin-top: .8rem; }
.ablation { border-collapse: collapse; font-size: .8rem; min-width: 500px; width: 100%; }
.ablation th, .ablation td { padding: .28rem .55rem; border: 1px solid #ccc; white-space: nowrap; }
.ablation thead th { background: #fdf0f0; font-weight: 700; text-align: center; }
.ablation thead th:first-child { text-align: left; }
.ablation td:first-child { text-align: left; }
.ablation td { text-align: center; }
.ablation td.combo { padding-left: 1.4rem; color: #333; }
.ablation tr.group-hdr th {
  background: #1a1a2e; color: #fff; font-size: .78rem;
  text-transform: uppercase; letter-spacing: .04em; text-align: left;
  padding: .3rem .55rem;
}
.std { font-size: .72em; opacity: .85; }
.legend { display: flex; align-items: center; gap: .7rem; margin-top: .6rem; font-size: .78rem; color: #555; }
.legend-bar {
  width: 140px; height: 12px; border-radius: 2px;
  background: linear-gradient(to right, #A50026, #F46D43, #FEFEBD, #A4D869, #006837);
  border: 1px solid #ccc;
}
.ablation-caption { font-size: .8rem; color: #555; margin-top: .5rem; }

/* ── Citation ── */
pre.bibtex {
  background: #f5f5f5; border: 1px solid #ddd; border-radius: 4px;
  padding: 1rem; font-size: .8rem; overflow-x: auto; white-space: pre;
}

/* ── Reproducibility ── */
code {
  background: #f5f5f5; border: 1px solid #ddd; border-radius: 3px;
  padding: .05rem .3rem; font-size: .85em;
}
code a { color: inherit; }

/* ── Footer ── */
footer { margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid #ddd;
         font-size: .8rem; color: #666; line-height: 1.8; }