:root {
  --fg: #1f2933;
  --fg-soft: #3d4a59;
  --fg-mute: #6b7785;
  --heading: #1d2d3a;
  --bg-page: #f4f6f9;
  --bg-card: #ffffff;
  --bg-tile: #f8fafc;
  --border: #dde2e9;
  --border-soft: #ebeef2;
  --row-hover: #f1f5fb;
  --link: #2461c4;
  --accent: #1f4fa8;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-page);
  color: var(--fg);
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 18px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 { color: var(--heading); font-weight: 700; }

.brand {
  font-family: "Roboto Slab", Georgia, serif;
  font-weight: 700;
  letter-spacing: 0;
}

.page {
  max-width: 1560px;
  margin: 0 auto;
  padding: 36px 28px 56px;
}

/* ---------- Card ---------- */

.card {
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: 0 6px 28px rgba(15, 23, 42, 0.07), 0 1px 2px rgba(15, 23, 42, 0.04);
  padding: 56px 64px;
  margin-bottom: 40px;
}

.card-heading {
  text-align: center;
  margin: 0 0 40px;
}

.card-heading h2 {
  display: inline-block;
  margin: 0;
  font-size: 34px;
  padding-bottom: 14px;
  border-bottom: 3px solid #d6dde6;
  letter-spacing: -0.01em;
}

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

.hero { text-align: center; padding-top: 64px; padding-bottom: 56px; }

.hero h1 {
  font-family: "Roboto Slab", Georgia, serif;
  font-size: 58px;
  margin: 0 0 14px;
  letter-spacing: 0;
  font-weight: 700;
}

.hero .tagline {
  font-size: 20px;
  color: var(--fg-soft);
  max-width: 820px;
  margin: 0 auto 8px;
  font-weight: 400;
}

.hero .byline {
  font-size: 16px;
  color: var(--fg-mute);
  margin: 0 0 26px;
  font-weight: 400;
}

.hero .badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
}
.hero .badges a { display: inline-flex; }
.hero .badges img { display: block; height: 28px; }

.hero .abstract {
  text-align: left;
  font-size: 17px;
  color: var(--fg);
  max-width: 1000px;
  margin: 0 auto 28px;
  line-height: 1.75;
}

.hero .abstract-label {
  display: block;
  margin-bottom: 6px;
  font-size: 20px;
}

.hero .contents-label {
  text-align: left;
  max-width: 1000px;
  margin: 16px auto 6px;
  font-size: 20px;
}

.hero .contents {
  text-align: left;
  max-width: 1000px;
  margin: 0 auto;
  padding-left: 24px;
  font-size: 17px;
  color: var(--fg-soft);
}
.hero .contents li { margin-bottom: 6px; }

/* ---------- Architecture ---------- */

.architecture { margin: 0; text-align: center; }
.architecture img {
  max-width: 720px;
  width: 100%;
  height: auto;
  border-radius: 10px;
}

.evaluation-charts {
  margin-top: 0;
}

.evaluation-chart {
  margin: 0 auto 28px;
  max-width: 1180px;
}

.evaluation-chart:last-child {
  margin-bottom: 0;
}

.evaluation-chart img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  background: #fbfcfe;
}

/* ---------- Blocks ---------- */

.blocks .block { margin-bottom: 44px; }
.blocks .block:last-child { margin-bottom: 0; }

.block-title { text-align: center; margin: 0 0 22px; }
.block-title h3 {
  display: inline-block;
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  color: var(--heading);
}

/* ---------- Table ---------- */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table.demo {
  border-collapse: collapse;
  width: 100%;
  margin: 0;
  font-size: 15.5px;
  background: var(--bg-card);
}

table.demo thead th {
  background: #eef2f7;
  color: var(--heading);
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: center;
  vertical-align: middle;
  white-space: nowrap;
}

table.demo tbody td {
  padding: 18px 16px;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: middle;
}

table.demo tbody tr:last-child td { border-bottom: none; }
table.demo tbody tr:hover td { background: var(--row-hover); }

/* Column-specific styling */

.col-lang {
  width: 130px;
  text-align: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-soft);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.col-ref, .col-result {
  width: 320px;
  text-align: center;
}

.col-text { text-align: left; line-height: 1.65; }

table.demo td.col-ref, table.demo td.col-result {
  background: rgba(36, 97, 196, 0.02);
}

table.demo td.col-ref audio,
table.demo td.col-result audio {
  width: 290px;
  height: 44px;
  display: block;
  margin: 0 auto;
}

.cell-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--fg);
}

.cell-audio { margin: 0; }

td.col-ref .cell-text {
  font-size: 13.5px;
  color: var(--fg-mute);
  line-height: 1.6;
  margin-bottom: 12px;
  text-align: left;
}

td.col-ref .cell-audio audio { margin: 0 auto; }

/* Audio pending placeholder */

.audio-pending {
  display: inline-block;
  color: var(--fg-mute);
  font-size: 13px;
  font-style: italic;
}

/* ---------- Footer ---------- */

footer {
  text-align: center;
  color: var(--fg-mute);
  font-size: 14px;
  padding: 28px 0 8px;
}
footer p { margin: 6px 0; }
.disclaimer { max-width: 760px; margin: 14px auto 0; line-height: 1.6; }

/* ---------- Responsive ---------- */

@media (max-width: 1100px) {
  .card { padding: 44px 40px; }
  .col-ref, .col-result { width: 280px; }
  table.demo td.col-ref audio,
  table.demo td.col-result audio { width: 250px; }
}

@media (max-width: 820px) {
  html, body { font-size: 16px; }
  .page { padding: 16px 12px 32px; }
  .card { padding: 28px 20px; border-radius: 12px; }
  .hero { padding-top: 36px; padding-bottom: 36px; }
  .hero h1 { font-size: 38px; }
  .hero .tagline, .hero .abstract, .hero .contents { font-size: 15px; }
  .hero .abstract-label, .hero .contents-label { font-size: 17px; }
  .card-heading h2 { font-size: 24px; }
  .evaluation-charts { margin-top: 0; }
  .evaluation-chart { margin-bottom: 18px; }
  .evaluation-chart img { border-radius: 8px; }
  .block-title h3 { font-size: 18px; }
  table.demo { font-size: 14px; }
  table.demo td.col-ref audio,
  table.demo td.col-result audio { width: 200px; height: 38px; }
  .col-ref, .col-result { width: 230px; }
  .metric-card { padding: 22px 16px; }
  .metric-card .metric-value { font-size: 36px; }
  .metric-card .metric-sub { font-size: 13.5px; }
}