:root {
  --ink: #16202c;
  --muted: #5b6b7c;
  --line: #dfe5ec;
  --accent: #1d4e89;
  --initial: #c1121f;
  --bg-soft: #f6f8fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: #fff;
}

.wrap {
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---- Hero ------------------------------------------------------------- */

.hero {
  background: linear-gradient(160deg, #16202c, #1d4e89);
  color: #fff;
  padding: 3rem 0 2.5rem;
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0.2rem 0 0.75rem;
  line-height: 1.15;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: #9fc3e8;
}

.tagline {
  max-width: 46rem;
  font-size: 1.05rem;
  color: #dce7f2;
  margin: 0 0 1.25rem;
}

.links a {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  margin-right: 0.5rem;
  text-decoration: none;
  font-size: 0.85rem;
  display: inline-block;
}

.links a:hover { background: rgba(255, 255, 255, 0.15); }

/* ---- Sections --------------------------------------------------------- */

section { margin-bottom: 3rem; }

h2 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--line);
}

h3 { font-size: 1.05rem; margin: 1.75rem 0 0.5rem; }

code {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.05rem 0.3rem;
  font-size: 0.9em;
}

pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
}

pre code { border: 0; background: none; padding: 0; }

.paper-link {
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  padding: 0.7rem 1rem;
  margin: 0.6rem 0;
}

.paper-link a {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.paper-link span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.hint { color: var(--muted); font-size: 0.9rem; }

/* ---- Tables ----------------------------------------------------------- */

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

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.7rem;
  border-bottom: 1px solid var(--line);
}

/* Headings may wrap; numeric cells stay on one line so that the
   "initial -> optimized" pairs remain readable. */
thead th {
  background: var(--bg-soft);
  font-weight: 600;
  white-space: normal;
}

td.num {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.delta { color: var(--accent); font-weight: 600; }
.delta.worse { color: var(--initial); }

/* ---- Experiment cards ------------------------------------------------- */

.experiment {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.25rem 1.5rem 1.75rem;
  margin-bottom: 2.5rem;
}

.experiment h2 { border-bottom-color: var(--accent); }

/* The first heading now follows the title directly, so it needs less lead-in. */
.experiment h2 + h3 { margin-top: 1rem; }

.audio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1rem 1.5rem;
}

.player h4 {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.player.initial h4 { color: var(--initial); }
.player.optimized h4 { color: var(--accent); }

audio { width: 100%; }

figure { margin: 1.25rem 0; }

figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 6px;
}

figcaption {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

details {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.9rem;
}

details summary {
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--muted);
}

details pre { margin-bottom: 0; white-space: pre-wrap; word-break: break-all; }

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 1.25rem 3rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.disclaimer {
  border-left: 3px solid var(--line);
  padding-left: 0.9rem;
  font-style: italic;
  max-width: 46rem;
}

.error {
  border: 1px solid var(--initial);
  border-radius: 6px;
  padding: 1rem;
  color: var(--initial);
}