:root {
  --bg: #f6f2ea;
  --bg-deep: #efe2cf;
  --surface: rgba(255, 255, 255, 0.8);
  --ink: #1f2430;
  --ink-soft: #4b5568;
  --accent: #176b58;
  --accent-2: #c5522b;
  --line: rgba(31, 36, 48, 0.12);
  --radius: 18px;
  --shadow: 0 20px 45px rgba(35, 30, 20, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Trebuchet MS", "Segoe UI", "Calibri", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 15%, #fff7ec 0%, transparent 35%),
    radial-gradient(circle at 85% 12%, #e7f4ee 0%, transparent 40%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-deep) 100%);
  min-height: 100vh;
  line-height: 1.6;
  position: relative;
}

main {
  width: min(1100px, 92%);
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(26px);
  opacity: 0.45;
  z-index: -1;
}

.orb-1 {
  width: 260px;
  height: 260px;
  background: #f8b88f;
  top: 4vh;
  right: 8vw;
}

.orb-2 {
  width: 340px;
  height: 340px;
  background: #96ceb8;
  bottom: 5vh;
  left: 2vw;
}

.site-header {
  width: min(1100px, 92%);
  margin: 1.2rem auto 0;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--surface);
  backdrop-filter: blur(5px);
  position: sticky;
  top: 0.8rem;
  z-index: 20;
}

.brand {
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.brand-mark {
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.brand-text {
  font-size: 0.92rem;
}

.nav {
  display: flex;
  gap: 0.3rem;
}

.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.93rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  transition: 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--ink);
  background: rgba(23, 107, 88, 0.12);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-family: inherit;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.2;
}

h1 {
  font-family: "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 0.8rem;
}

.hero {
  margin-top: 2rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--accent);
  margin-bottom: 0.7rem;
  font-weight: 700;
}

.lead {
  color: var(--ink-soft);
  max-width: 70ch;
}

.meta-inline {
  margin: 0.55rem 0 0.7rem;
  font-size: 0.93rem;
  color: var(--ink-soft);
}

.badge-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.75rem 0 1rem;
}

.badge-strip a {
  display: inline-flex;
  line-height: 0;
  border-radius: 999px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.badge-strip a:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(40, 35, 24, 0.15);
}

.badge-strip img {
  height: 22px;
}

.hero-actions {
  margin-top: 1.2rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border-radius: 999px;
  text-decoration: none;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.6);
}

.text-link {
  color: var(--accent-2);
  text-decoration-thickness: 2px;
}

.stats {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
}

.stats article,
.card,
.paper-card,
.filters {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(40, 35, 24, 0.06);
}

.card {
  margin-top: 1rem;
}

.card h2 {
  margin-bottom: 0.6rem;
}

.card p {
  margin: 0.5rem 0;
}

.stats h2 {
  font-size: 1.4rem;
  margin-bottom: 0.2rem;
}

.stats p {
  margin: 0;
  color: var(--ink-soft);
}

.grid-2 {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.grid-3 {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.section-heading {
  margin-top: 2rem;
  margin-bottom: 0.1rem;
}

.section-heading h2 {
  font-size: 1.35rem;
  font-family: "Palatino Linotype", "Book Antiqua", Georgia, serif;
}

.finding-card {
  text-align: center;
}

.finding-icon {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.beta-notice {
  margin-top: 1.5rem;
  background: linear-gradient(135deg, rgba(255, 247, 236, 0.9), rgba(231, 244, 238, 0.7));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.beta-notice p {
  margin: 0;
  flex: 1;
}

.access-steps {
  margin-top: 0.5rem;
}

.steps-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.2rem 0;
  display: grid;
  gap: 1rem;
}

.steps-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.steps-list p {
  margin: 0.2rem 0 0;
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.citation-text {
  background: rgba(23, 107, 88, 0.06);
  border-left: 3px solid var(--accent);
  padding: 0.6rem 0.85rem;
  border-radius: 0 8px 8px 0;
  margin: 0.6rem 0;
}

.citation-grid {
  margin-top: 0.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  align-items: start;
}

.citation-prose,
.citation-bibtex {
  height: 100%;
}

.citation-note {
  margin-top: 0.8rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  font-style: italic;
}

.card ul,
.card ol {
  padding-left: 1.2rem;
}

.toc-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(231, 244, 238, 0.68));
}

.toc-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.toc-list li {
  margin: 0;
}

.toc-list a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  background: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

.citation-block {
  margin: 0.8rem 0;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.65);
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.86rem;
  line-height: 1.45;
}

.page-intro {
  margin-top: 1.8rem;
}

.filters {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: auto 1fr auto 220px;
  gap: 0.6rem;
  align-items: center;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.55rem 0.7rem;
  font: inherit;
  background: #fff;
}

.paper-meta {
  margin-top: 0.7rem;
}

.papers-list {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.paper-card {
  display: grid;
  gap: 0.45rem;
}

.paper-card h3 {
  margin-bottom: 0.2rem;
  font-size: 1.05rem;
}

.paper-authors,
.paper-journal {
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.paper-tags span,
.paper-type {
  display: inline-block;
  font-size: 0.76rem;
  padding: 0.16rem 0.55rem;
  border-radius: 999px;
  background: rgba(23, 107, 88, 0.12);
}

.paper-type {
  background: rgba(197, 82, 43, 0.14);
}

.site-footer {
  width: min(1100px, 92%);
  margin: 0 auto 2rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  padding-top: 1rem;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: reveal 0.5s ease forwards;
}

.stagger > * {
  opacity: 0;
  transform: translateY(10px);
  animation: reveal 0.45s ease forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.08s; }
.stagger > *:nth-child(2) { animation-delay: 0.16s; }
.stagger > *:nth-child(3) { animation-delay: 0.24s; }
.stagger > *:nth-child(4) { animation-delay: 0.32s; }
.stagger > *:nth-child(5) { animation-delay: 0.40s; }
.stagger > *:nth-child(6) { animation-delay: 0.48s; }

@keyframes reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .stats,
  .grid-2,
  .grid-3,
  .citation-grid,
  .papers-list {
    grid-template-columns: 1fr;
  }

  .beta-notice {
    flex-direction: column;
  }

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

  .site-header {
    border-radius: 16px;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  .nav {
    width: 100%;
    display: none;
    flex-direction: column;
    gap: 0.2rem;
  }

  .nav.open {
    display: flex;
  }

  .toc-list {
    grid-template-columns: 1fr;
  }
}