* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

:root {
  --ink: #171717;
  --muted: #5f5f5f;
  --line: #d7d5ce;
  --line-soft: #e8e6df;
  --paper: #f7f5ef;
  --paper-2: #f2efe7;
  --card: #ffffff;
  --accent: #121212;
  --blue: #466db8;
  --orange: #cb5a37;
  --radius-lg: 18px;
  --radius-md: 14px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -5%, #ece8df 0, transparent 42%),
    radial-gradient(circle at 90% 0, #efe9de 0, transparent 38%),
    var(--paper);
  font-family: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 120;
  backdrop-filter: blur(8px);
  background: rgb(247 245 239 / 88%);
  border-bottom: 1px solid #e4dfd4;
}

.nav-shell {
  min-height: 74px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
}

.nav-brand {
  font-family: "Noto Serif", Georgia, serif;
  font-size: 2rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-dot {
  color: #cc4b2c;
}

.nav-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 1.02rem;
  font-weight: 600;
  color: #4c4c4c;
}

.nav-links a:hover {
  color: #141414;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 104px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid #101010;
  background: #111111;
  color: #ffffff;
  font-size: 0.98rem;
  font-weight: 600;
}

img,
video {
  display: block;
  width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

pre,
code {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.container {
  width: min(100% - 34px, 1240px);
  margin: 0 auto;
}

.container.medium {
  max-width: 980px;
}

.container.wide {
  max-width: 1280px;
}

.page-title,
.section-title,
.table-card h3,
.note-card h3 {
  font-family: "Noto Serif", Georgia, serif;
}

.hero-block {
  padding: 34px 0 20px;
}

.hero-shell {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(160deg, #fcfbf8 0%, #f7f4ee 100%);
  box-shadow: 0 10px 30px rgb(28 28 28 / 5%);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  gap: 20px;
  align-items: start;
}

.hero-tag {
  display: inline-flex;
  margin: 0 0 8px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid #c9c3b5;
  background: #f1ede4;
  color: #4f4b3f;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.page-title {
  margin: 0 0 10px;
  font-size: clamp(1.52rem, 2.4vw, 2.38rem);
  line-height: 1.2;
  font-weight: 700;
  max-width: 720px;
}

.hero-summary {
  margin: 0 0 10px;
  color: #363636;
  font-size: 1.04rem;
}

.author-line {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 98px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid #1c1c1c;
  font-size: 0.9rem;
  font-weight: 600;
  color: #ffffff;
  background: #111111;
}

.kpi-row {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kpi-pill {
  padding: 6px 10px;
  border: 1px solid #cfcabf;
  border-radius: 999px;
  background: #ffffff;
  font-size: 0.85rem;
  color: #4b4b4b;
}

.kpi-pill span {
  font-weight: 700;
  color: #111111;
}

.hero-figure {
  margin: 0;
  align-self: stretch;
}

.hero-figure img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: #ffffff;
}

.hero-figure figcaption {
  margin-top: 9px;
  color: #656565;
  font-size: 0.92rem;
}

.section-block {
  padding: 22px 0 30px;
}

.section-alt {
  background: linear-gradient(180deg, #f5f2ea 0%, #f8f6f1 100%);
  border-top: 1px solid #ebe7de;
  border-bottom: 1px solid #ebe7de;
}

.section-head {
  margin-bottom: 14px;
}

.section-title {
  margin: 0;
  font-size: 1.88rem;
  line-height: 1.2;
  text-align: left;
}

.section-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 940px;
}

.construction-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  gap: 16px;
}

.paper-figure {
  margin: 0;
}

.paper-figure img {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #ffffff;
}

.paper-figure figcaption {
  margin-top: 10px;
  color: #666666;
  font-size: 0.95rem;
}

.construction-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.note-card {
  padding: 14px 14px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fffdfa;
}

.note-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.note-card p {
  margin: 0;
  color: #5f5f5f;
  font-size: 0.95rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0 14px;
}

.stat-card {
  padding: 12px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #ffffff;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.55rem;
  line-height: 1.05;
  font-weight: 700;
}

.stat-label {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.88rem;
}

.statistics-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.distribution-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--line);
  padding: 10px;
}

.distribution-figure img {
  border: none;
  border-radius: 10px;
}

.table-stack {
  display: grid;
  gap: 10px;
}

.dimension-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.dimension-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 10px 6px;
  text-align: center;
}

.dimension-card strong {
  display: block;
  font-size: 1.18rem;
  line-height: 1.05;
}

.dimension-card span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.table-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.table-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 12px 12px 8px;
}

.table-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  text-align: center;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.stats-table th,
.stats-table td {
  padding: 5px 2px;
  border-bottom: 1px solid var(--line-soft);
}

.stats-table th {
  text-align: left;
  font-weight: 700;
}

.stats-table th:nth-child(2),
.stats-table th:nth-child(3),
.stats-table td:nth-child(2),
.stats-table td:nth-child(3) {
  text-align: right;
}

.stats-table tbody tr:last-child td {
  border-bottom: none;
}

.analysis-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 14px;
  align-items: start;
}

.text-content {
  font-size: 1.05rem;
}

.text-content p {
  margin: 0 0 12px;
}

.result-copy {
  margin-bottom: 10px;
}

.results-panel {
  display: grid;
  gap: 10px;
}

.result-row {
  display: grid;
  grid-template-columns: minmax(170px, 230px) minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
}

.result-model {
  font-weight: 700;
}

.result-bar {
  height: 13px;
  border-radius: 999px;
  background: #ebe7de;
  overflow: hidden;
}

.result-fill {
  height: 100%;
  background: var(--blue);
}

.result-fill.ours {
  background: var(--orange);
}

.result-score {
  min-width: 58px;
  text-align: right;
  font-weight: 700;
}

.compact {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #ffffff;
  padding: 10px;
}

.compact img {
  border: none;
  border-radius: 10px;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 10px 0 16px;
}

.filter-chip {
  padding: 8px 14px;
  border: 1px solid #c7c2b6;
  border-radius: 999px;
  background: #fefdf9;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: #3f3f3f;
  cursor: pointer;
}

.filter-chip.active {
  border-color: #131313;
  background: #141414;
  color: #ffffff;
}

.sample-browser {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #ffffff;
}

.sample-card {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
}

.sample-video-wrap {
  background: #111111;
  aspect-ratio: 16 / 9;
}

.sample-video {
  height: 100%;
  object-fit: cover;
}

.sample-content {
  border-left: 1px solid var(--line);
  padding: 14px 16px 16px;
}

.sample-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 9px;
}

.sample-counter {
  color: var(--muted);
  font-size: 0.93rem;
  font-weight: 600;
}

.sample-nav {
  display: flex;
  gap: 6px;
}

.sample-nav button {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid #cecabf;
  background: #ffffff;
  font: inherit;
  cursor: pointer;
}

.sample-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 9px;
}

.sample-chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  background: #f2efe7;
  font-size: 0.84rem;
  font-weight: 600;
  color: #4a4a4a;
}

.sample-chip.gold {
  background: #f0efe8;
  color: #2f2f2f;
}

.sample-question {
  margin: 0 0 8px;
  font-size: 1.1rem;
  line-height: 1.4;
}

.option-block {
  margin: 0 0 10px;
  padding: 10px 11px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  background: #fbfaf6;
}

.option-block strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

.option-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.option-item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 6px 7px;
  border: 1px solid #e3e0d7;
  border-radius: 8px;
  background: #ffffff;
}

.option-item.correct {
  border-color: #8ab78f;
  background: #f5fbf5;
}

.option-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1px solid #d2cec2;
  font-size: 0.8rem;
  font-weight: 700;
  color: #4a4a4a;
  background: #fbfaf6;
}

.option-item.correct .option-key {
  border-color: #81ab86;
  color: #2d6738;
  background: #ecf8ed;
}

.option-text {
  font-size: 0.88rem;
  line-height: 1.4;
  color: #464646;
}

.sample-text {
  margin: 0 0 8px;
  color: #4f4f4f;
}

.oe-card {
  margin-top: 10px;
  padding: 10px 12px 11px;
  border: 1px solid #cfd9e6;
  border-radius: 11px;
  background: linear-gradient(180deg, #f7fbff 0%, #f1f7fd 100%);
}

.oe-head {
  margin-bottom: 6px;
}

.oe-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid #b8cbe3;
  background: #ffffff;
  color: #355684;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.oe-text {
  margin: 0;
  color: #3f4f64;
  font-size: 0.9rem;
  line-height: 1.45;
}

.answer-box {
  margin-top: 8px;
  padding: 10px 12px;
  border-left: 3px solid #355fa6;
  background: #f6f8fc;
}

.answer-box strong {
  display: block;
  margin-bottom: 3px;
}

.citation-block {
  margin: 0;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fcfbf8;
  line-height: 1.6;
  overflow-x: auto;
}

@media (max-width: 1120px) {
  .hero-layout,
  .construction-layout,
  .statistics-layout,
  .analysis-grid,
  .sample-card {
    grid-template-columns: 1fr;
  }

  .sample-content {
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .table-grid {
    grid-template-columns: 1fr;
  }

  .dimension-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .nav-shell {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 10px 0 12px;
  }

  .nav-brand {
    font-size: 1.55rem;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 16px;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 4px;
  }

  .nav-links a {
    font-size: 0.92rem;
  }

  .nav-cta {
    justify-self: start;
    height: 38px;
    min-width: 94px;
    font-size: 0.88rem;
  }

  .container {
    width: min(100% - 18px, 1240px);
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .dimension-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .construction-notes {
    grid-template-columns: 1fr;
  }

  .result-row {
    grid-template-columns: 1fr;
  }
}