:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef4f8;
  --ink: #0f172a;
  --muted: #5f6b7a;
  --line: #dbe3ea;
  --blue: #0f4c81;
  --blue-soft: #e7f1fb;
  --arxiv-red: #b31b1b;
  --green: #1e8e5a;
  --orange: #f27d2d;
  --red: #d94848;
  --shadow: 0 18px 55px rgba(15, 23, 42, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(15, 76, 129, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(15, 76, 129, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(180deg, black 0%, transparent 72%);
}

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

button {
  font: inherit;
}

.wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(219, 227, 234, 0.86);
  background: rgba(246, 248, 251, 0.88);
  backdrop-filter: blur(16px);
}

.nav {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.nav-links {
  gap: 24px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 700;
}

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

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  padding: 62px 0 54px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 38px;
  align-items: center;
}

.hero-copy {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  margin: 0 0 13px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  font-size: clamp(3.4rem, 9vw, 7.2rem);
  line-height: 0.9;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1;
  letter-spacing: 0;
}

.paper-title {
  max-width: 900px;
  margin: 0 auto 24px;
  color: var(--ink);
  font-size: clamp(1.55rem, 3.2vw, 3rem);
  line-height: 1.08;
  font-weight: 800;
}

.summary,
.split p,
.quiet p,
.teaser figcaption {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.68;
}

.summary {
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.authors {
  margin: 0 0 7px;
  color: var(--ink);
  font-size: clamp(1.05rem, 1.6vw, 1.22rem);
  font-weight: 800;
  line-height: 1.45;
}

.paper-meta {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.affiliation {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.45;
}

.release-banner {
  width: min(620px, 100%);
  margin: 24px auto 0;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid rgba(242, 125, 45, 0.35);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  background: rgba(242, 125, 45, 0.10);
  color: #7a3a0b;
}

.release-banner strong {
  flex: 0 0 auto;
  color: #a2490d;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.release-banner span {
  color: var(--muted);
  font-weight: 700;
  line-height: 1.35;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}

.hero-badges span,
.source-strip span {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--blue);
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.82rem;
  font-weight: 800;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn.primary {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.18);
}

.btn.arxiv-button {
  background: var(--arxiv-red);
  border-color: var(--arxiv-red);
}

.btn.ghost {
  background: var(--surface);
}

.btn.disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: none;
}

.btn.disabled:hover {
  transform: none;
}

.paper-link {
  min-width: 96px;
}

.arxiv-logo {
  display: block;
  width: 58px;
  height: auto;
}

.btn-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.teaser {
  grid-column: 1 / -1;
  width: 100%;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.teaser img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 68vh;
  object-fit: contain;
  border-radius: 5px;
}

.teaser figcaption {
  margin-top: 11px;
  font-size: 0.88rem;
}

.section {
  padding: 76px 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 26px;
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.fact,
.quiet {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.fact {
  min-height: 148px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.fact strong {
  display: block;
  font-size: clamp(2.25rem, 4vw, 4rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.fact span {
  color: var(--muted);
  font-weight: 700;
  line-height: 1.35;
}

.source-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.source-strip span {
  color: var(--muted);
  background: var(--surface);
}

.split-section {
  background: #0f172a;
  color: #fff;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 46px;
  align-items: center;
}

.split-section .eyebrow {
  color: #8fd3ff;
}

.split-section p {
  color: rgba(255, 255, 255, 0.7);
}

.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.category-list span {
  min-height: 42px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 800;
}

.category-list span:nth-child(1) { background: rgba(26, 188, 211, 0.26); }
.category-list span:nth-child(2) { background: rgba(242, 125, 45, 0.26); }
.category-list span:nth-child(3) { background: rgba(117, 100, 196, 0.26); }
.category-list span:nth-child(4) { background: rgba(15, 76, 129, 0.34); }
.category-list span:nth-child(5) { background: rgba(217, 72, 72, 0.28); }
.category-list span:nth-child(6) { background: rgba(30, 142, 90, 0.30); }
.category-list span:nth-child(7) { background: rgba(42, 143, 184, 0.28); }

.quiet-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.quiet {
  padding: 30px;
}

.quiet h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.regime-track {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.07);
}

.regime-track div {
  min-height: 116px;
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--blue-soft), #fff);
  border: 1px solid rgba(15, 76, 129, 0.08);
}

.regime-track div:nth-child(n+5) {
  background: linear-gradient(180deg, rgba(30, 142, 90, 0.12), #fff);
}

.regime-track strong {
  font-size: 0.92rem;
  line-height: 1.15;
}

.regime-track span {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.info,
.insight {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.info {
  padding: 24px;
  min-height: 230px;
}

.info span {
  display: inline-flex;
  margin-bottom: 34px;
  color: var(--blue);
  font-weight: 800;
  font-size: 0.82rem;
}

.info h3 {
  margin-bottom: 12px;
  font-size: 1.12rem;
  line-height: 1.18;
}

.info p,
.insight p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.62;
}

.insight {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 34px;
  align-items: start;
  padding: 34px;
}

.insight h2 {
  margin-bottom: 0;
  font-size: clamp(1.9rem, 3.2vw, 3.2rem);
}

.insight-list {
  display: grid;
  gap: 14px;
}

.insight-list p {
  padding-left: 16px;
  border-left: 3px solid var(--blue);
}

.footer {
  padding: 32px 0 44px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-weight: 700;
}

.footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 940px) {
  .hero-grid,
  .split,
  .quiet-grid,
  .insight {
    grid-template-columns: 1fr;
  }

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

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

  .regime-track {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .wrap {
    width: min(100% - 28px, 1160px);
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 68px;
    right: 14px;
    width: min(260px, calc(100vw - 28px));
    padding: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: 0.18s ease;
  }

  .nav-links a {
    padding: 12px;
  }

  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .hero {
    padding-top: 46px;
  }

  .release-banner {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  h1 {
    font-size: clamp(3.2rem, 18vw, 5.2rem);
  }

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

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

  .regime-track {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
  }
}