@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,300&family=Instrument+Serif:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

:root {
  --black: #0a0a0a;
  --white: #f5f4f0;
  --gray-100: #ebebea;
  --gray-300: #c8c7c3;
  --gray-500: #888884;
  --gray-700: #444442;
  --accent: #1a5c3a;
  --accent-light: #2d8a57;
  --accent-dim: rgba(26, 92, 58, 0.12);
  --mono: 'DM Mono', monospace;
  --serif: 'Instrument Serif', serif;
  --sans: 'DM Sans', sans-serif;
  --max: 1100px;
  --pad: clamp(1.5rem, 5vw, 4rem);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--white);
  color: var(--black);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(245, 244, 240, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-100);
  padding: 0 var(--pad);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--black);
  text-decoration: none;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-700);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

/* ── LAYOUT ── */
main {
  padding-top: 56px;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ── HERO ── */
.hero {
  padding: clamp(5rem, 12vw, 9rem) 0 clamp(4rem, 8vw, 7rem);
  border-bottom: 1px solid var(--gray-100);
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-label::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  max-width: 14ch;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--gray-700);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: 3rem;
  font-weight: 300;
}

/* ── SECTION ── */
section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  border-bottom: 1px solid var(--gray-100);
}

section:last-child {
  border-bottom: none;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: attr(data-num);
  color: var(--accent);
  font-size: 0.65rem;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

h3 {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
}

p {
  color: var(--gray-700);
  max-width: 65ch;
  margin-bottom: 1.25rem;
}

/* ── GRID ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--gray-100);
  border: 1px solid var(--gray-100);
}

.grid-cell {
  background: var(--white);
  padding: 2.5rem;
}

.grid-cell h3 {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.grid-cell p {
  font-size: 0.95rem;
  margin: 0;
}

/* ── LIST ── */
.clean-list {
  list-style: none;
  border-top: 1px solid var(--gray-100);
}

.clean-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--gray-700);
}

.clean-list li::before {
  content: attr(data-n);
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--accent);
  margin-top: 0.15rem;
  flex-shrink: 0;
  letter-spacing: 0.1em;
}

/* ── TAG ── */
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* ── LINK ── */
a {
  color: inherit;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  transition: gap 0.2s;
}

.link-arrow:hover {
  gap: 0.85rem;
}

.link-arrow::after {
  content: '→';
}

/* ── CTA BLOCK ── */
.cta-block {
  background: var(--black);
  color: var(--white);
  padding: clamp(3rem, 6vw, 5rem) var(--pad);
}

.cta-block h2 {
  color: var(--white);
  max-width: 20ch;
}

.cta-block p {
  color: var(--gray-300);
  margin-bottom: 2rem;
}

.cta-links {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.cta-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding-bottom: 0.25rem;
  transition: border-color 0.2s, gap 0.2s;
}

.cta-link:hover {
  border-color: var(--accent-light);
  gap: 0.85rem;
  color: var(--accent-light);
}

.cta-link::after {
  content: '→';
}

/* ── METRIC CARD ── */
.metric-card {
  padding: 2.5rem;
  border: 1px solid var(--gray-100);
}

.metric-value {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 1rem;
}

.metric-desc {
  font-size: 0.9rem;
  color: var(--gray-700);
  margin: 0;
  max-width: 30ch;
}

/* ── FOOTER ── */
footer {
  background: var(--black);
  color: var(--gray-500);
  padding: 3rem var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white);
}

.footer-meta {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  line-height: 1.8;
  text-align: right;
}

.footer-meta a {
  color: var(--accent-light);
  text-decoration: none;
}

/* ── TABLE ── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 2rem;
}

.data-table th {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-500);
  text-align: left;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--gray-100);
  font-weight: 400;
}

.data-table td {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
  vertical-align: top;
}

.data-table tr:hover td {
  background: rgba(26, 92, 58, 0.03);
}

/* ── TAXONOMY LEVEL ── */
.tax-level {
  display: flex;
  align-items: stretch;
  gap: 0;
  border: 1px solid var(--gray-100);
  margin-bottom: 1px;
}

.tax-num {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--white);
  background: var(--accent);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  writing-mode: vertical-lr;
  text-transform: uppercase;
  min-width: 3rem;
}

.tax-level.l1 .tax-num { background: var(--gray-300); color: var(--black); }
.tax-level.l2 .tax-num { background: var(--gray-500); }
.tax-level.l3 .tax-num { background: var(--accent); }
.tax-level.l4 .tax-num { background: var(--black); }

.tax-content {
  padding: 1.75rem 2rem;
  flex: 1;
}

.tax-content h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.tax-content p {
  font-size: 0.9rem;
  margin: 0;
}

/* ── PUB ENTRY ── */
.pub-entry {
  padding: 2rem 0;
  border-bottom: 1px solid var(--gray-100);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
}

.pub-type {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.pub-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.pub-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--gray-500);
  letter-spacing: 0.05em;
}

.pub-doi {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* ── MOBILE ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  footer { flex-direction: column; }
  footer .footer-meta { text-align: left; }
  .pub-entry { grid-template-columns: 1fr; }
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-label { animation: fadeUp 0.5s ease both; }
.hero h1 { animation: fadeUp 0.6s 0.1s ease both; }
.hero-sub { animation: fadeUp 0.6s 0.2s ease both; }
.hero .link-arrow { animation: fadeUp 0.6s 0.3s ease both; }