:root {
  color-scheme: light;
  --bg: #ffffff;
  --ink: #202124;
  --muted: #5f6368;
  --line: #dadce0;
  --soft: #f7f8f9;
  --accent: #1a73e8;
  --emphasis: #b06000;
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
}

.site-header {
  border-bottom: 1px solid var(--line);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  gap: 28px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 600;
}

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

.hero,
main {
  width: min(1500px, calc(100% - 24px));
  margin: 0 auto;
}

.hero {
  padding: 58px 0 42px;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(2.3rem, 6vw, 4.3rem);
  line-height: 1.05;
  letter-spacing: 0;
  font-weight: 700;
}

.lede {
  max-width: 760px;
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 1.15rem;
}

main {
  padding: 30px 0 56px;
}

.intro {
  max-width: 860px;
  margin: 0 auto 34px;
  color: var(--muted);
  text-align: center;
}

.sample-section {
  padding: 34px 0 16px;
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 20px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.sample-list {
  display: grid;
  gap: 24px;
}

.sample-block {
  border: 1px solid var(--line);
  background: var(--bg);
}

.target-row {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 13px 14px;
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.target-row p {
  margin: 0;
  overflow-wrap: anywhere;
}

.target-row strong {
  color: var(--emphasis);
  font-weight: 800;
}

.sample-index {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 6px;
}

.demo-table {
  width: 100%;
  min-width: 1500px;
  border-collapse: collapse;
  background: var(--bg);
  table-layout: fixed;
}

.demo-table th,
.demo-table td {
  padding: 8px 9px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}

.demo-table th:last-child,
.demo-table td:last-child {
  border-right: 0;
}

.demo-table tbody tr:last-child td {
  border-bottom: 0;
}

.demo-table thead th {
  background: var(--soft);
  text-align: center;
  white-space: nowrap;
  font-size: 0.86rem;
  font-weight: 700;
}

.paper-math .katex {
  font-size: 1em;
}

audio {
  display: block;
  width: 100%;
  min-width: 145px;
  height: 32px;
}

.load-error {
  padding: 14px;
  border: 1px solid #c5221f;
  background: #fce8e6;
  color: #8c1d18;
}

@media (max-width: 720px) {
  .nav {
    justify-content: flex-start;
    gap: 20px;
    overflow-x: auto;
  }

  .hero {
    padding: 42px 0 32px;
  }

  .target-row {
    display: block;
  }

  .sample-index {
    margin-bottom: 5px;
  }

  .demo-table {
    min-width: 1500px;
  }
}