:root {
  --bg: #f5efe4;
  --paper: #fffaf2;
  --ink: #132233;
  --muted: #4f6373;
  --line: #dfd2be;
  --teal: #0b8e85;
  --teal-soft: #d4f3ef;
  --orange: #ea6f46;
  --orange-soft: #ffe5d7;
  --radius: 18px;
  --shadow: 0 14px 42px rgba(16, 34, 51, 0.08);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: 'Sora', 'Noto Sans KR', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, #c4ebe3 0%, rgba(196, 235, 227, 0) 32%),
    radial-gradient(circle at 90% 6%, #ffd7c4 0%, rgba(255, 215, 196, 0) 30%),
    linear-gradient(180deg, #f7f2e8 0%, #efe8db 100%);
  min-height: 100vh;
  position: relative;
}

.noise-layer {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(19, 34, 51, 0.05) 0.6px, transparent 0.6px);
  background-size: 6px 6px;
  opacity: 0.15;
  z-index: 0;
}

.site-header,
main,
.site-footer {
  width: min(1120px, calc(100vw - 32px));
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}

.site-header {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 250, 242, 0.82);
  backdrop-filter: blur(10px);
  padding: 10px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-family: 'Fraunces', serif;
  font-size: 1.1rem;
}

nav {
  display: flex;
  gap: 14px;
}

nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 999px;
  transition: background-color 0.2s ease;
}

nav a:hover {
  background: var(--teal-soft);
}

.hero {
  margin-top: 34px;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(135deg, rgba(255, 250, 242, 0.94), rgba(212, 243, 239, 0.45));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--teal);
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: 'Fraunces', serif;
  line-height: 1.1;
}

h1 {
  margin: 10px 0 6px;
  font-size: clamp(2.2rem, 4.2vw, 4rem);
}

.hero-subtitle {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--muted);
}

.hero-description {
  margin-top: 12px;
  max-width: 760px;
  font-size: 0.98rem;
  color: var(--muted);
}

.stats-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.8);
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 4px;
}

.section {
  margin-top: 28px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
  margin-bottom: 16px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.collection-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  background: linear-gradient(170deg, #fff, #fff8ef);
}

.collection-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.collection-meta {
  margin-top: 9px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  background: var(--teal-soft);
  color: #0d5754;
  padding: 5px 10px;
  font-size: 0.78rem;
  font-weight: 600;
}

.collection-focus {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.collection-source {
  margin-top: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-size: 0.74rem;
  color: #6b7d8c;
}

.paper-list {
  display: grid;
  gap: 12px;
}

.paper-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: #fff;
}

.paper-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.paper-domain {
  font-size: 0.75rem;
  font-weight: 700;
  color: #0b5e9a;
  letter-spacing: 0.02em;
}

.paper-score {
  border-radius: 999px;
  background: var(--orange-soft);
  color: #8e3d1e;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
}

.paper-title {
  margin: 10px 0 6px;
  font-size: 1rem;
  line-height: 1.35;
}

.paper-authors,
.paper-date {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.paper-links {
  margin-top: 10px;
  display: flex;
  gap: 8px;
}

.paper-links a,
.notebook-link {
  text-decoration: none;
  font-size: 0.8rem;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.paper-links a:hover,
.notebook-link:hover {
  background: var(--teal-soft);
  transform: translateY(-2px);
}

.notebook-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.notebook-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: linear-gradient(165deg, #ffffff, #fff7ec);
}

.notebook-card h3 {
  margin: 0;
  font-size: 1rem;
}

.notebook-meta {
  margin: 8px 0 12px;
  font-size: 0.84rem;
  color: var(--muted);
}

.reference-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.reference-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
}

.reference-title {
  font-size: 0.95rem;
  font-weight: 600;
}

.reference-path {
  margin-top: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-size: 0.74rem;
  color: #708090;
}

.site-footer {
  margin-top: 24px;
  margin-bottom: 40px;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(24px) scale(0.99);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@media (max-width: 980px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-grid,
  .notebook-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 8px 12px;
  }

  nav {
    gap: 6px;
  }

  nav a {
    padding: 6px 8px;
    font-size: 0.78rem;
  }

  .hero,
  .section {
    padding: 18px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer {
    flex-direction: column;
  }
}