@import url('https://fonts.googleapis.com/css2?family=Newsreader:opsz,wght@6..72,400;6..72,600;6..72,700&display=swap');
@import url('https://api.fontshare.com/v2/css?f[]=general-sans@400,500,600&display=swap');

:root {
  --bg:          #edeae3;
  --bg-card:     #e6e2da;
  --bg-white:    #f5f2ed;
  --ink:         #181814;
  --ink-2:       #4a4840;
  --ink-3:       #8a8880;
  --accent:      #c04030;
  --accent-soft: rgba(192, 64, 48, 0.08);
  --border:      rgba(24, 24, 20, 0.12);
  --border-2:    rgba(24, 24, 20, 0.07);
  --radius:      10px;
  --radius-sm:   6px;
  --shadow:      0 2px 16px rgba(24, 24, 20, 0.07);
  --font-sans:   "General Sans", system-ui, sans-serif;
  --font-serif:  "Newsreader", Georgia, serif;
  --max:         1200px;
  --nav-h:       60px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink-2);
  background: var(--bg);
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

/* ── Nav ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  background: rgba(237, 234, 227, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.07em;
  color: var(--ink);
  text-decoration: none;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand::after {
  content: "University of Maryland";
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--ink-3);
  letter-spacing: 0.01em;
  text-transform: none;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
}
.brand:hover { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--ink-2);
}
.nav-toggle svg { width: 22px; height: 22px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--ink-2);
  text-decoration: none;
}
.nav-links a:hover { color: var(--accent); }

.nav-cta {
  color: var(--ink) !important;
  font-weight: 600 !important;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 1px;
}
.nav-cta:hover { color: var(--accent) !important; }

@media (max-width: 860px) {
  .site-header { padding: 0 1.25rem; }
  .brand::after { display: none; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1.25rem 1.25rem;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 0.65rem 0; border-bottom: 1px solid var(--border-2); }
  .nav-links a:last-child { border-bottom: none; }
}

/* ── Hero ── */
.hero {
  padding: 5rem 2.5rem 4.5rem;
  max-width: var(--max);
  margin: 0 auto;
}

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 0 0 1.25rem;
}
.hero-kicker::before {
  content: "";
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--accent);
  flex-shrink: 0;
}

h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.4rem, 5vw, 3.75rem);
  line-height: 1.08;
  margin: 0 0 2rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 20ch;
}

/* Authors block */
.hero-meta {
  margin-bottom: 2rem;
}

.venue-badge {
  display: inline-block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(192, 64, 48, 0.2);
  border-radius: 4px;
  padding: 0.3rem 0.85rem;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.authors {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 0.4rem;
  line-height: 1.6;
}
.authors strong { font-weight: 600; }

.affil {
  font-size: 0.85rem;
  color: var(--ink-3);
  margin: 0 0 0.25rem;
}
.affil a { color: var(--ink-3); }
.affil a:hover { color: var(--accent); }

/* Hero two-col */
.hero-body {
  display: grid;
  grid-template-columns: 5fr 4fr;
  gap: 3rem 5rem;
  align-items: start;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.hero-desc {
  font-size: 0.97rem;
  color: var(--ink-2);
  line-height: 1.7;
  margin: 0 0 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.key-results { }
.key-results h4 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin: 0 0 1rem;
}
.key-result-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.key-result-item .num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  line-height: 1;
}
.key-result-item .desc {
  font-size: 0.88rem;
  color: var(--ink-2);
  line-height: 1.4;
}

@media (max-width: 720px) {
  .hero { padding: 3rem 1.25rem; }
  .hero-body { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.84rem;
  text-decoration: none;
  border: 1.5px solid transparent;
}
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; text-decoration: none; }
.btn-ghost { border-color: var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ── Divider ── */
hr.section-rule { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ── Main ── */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2.5rem 5rem;
}
@media (max-width: 720px) { main { padding: 0 1.25rem 4rem; } }

section { padding-top: 4.5rem; }
section[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }

/* ── Section overline ── */
.overline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 0 0 1rem;
}
.overline::before {
  content: "";
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--accent);
  flex-shrink: 0;
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 700;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
}

h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h4 {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin: 0 0 0.6rem;
}

/* ── Section layout ── */
.section-intro {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 2rem 5rem;
  align-items: start;
  margin-bottom: 2rem;
}
@media (max-width: 720px) {
  .section-intro { grid-template-columns: 1fr; gap: 1rem; }
}

/* ── Prose ── */
.prose {
  font-size: 0.97rem;
  font-weight: 400;
  color: var(--ink-2);
  line-height: 1.75;
}
.prose p { margin: 0 0 0.9rem; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.83em;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  color: var(--accent);
}

/* ── Figures ── */
.figure {
  margin: 2rem 0;
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}
.figure-img { padding: 1rem 1rem 0; }
.figure img { display: block; width: 100%; height: auto; border-radius: var(--radius-sm); max-height: 420px; object-fit: contain; }
.figure figcaption {
  font-size: 0.82rem;
  color: var(--ink-3);
  padding: 0.85rem 1rem 1rem;
  line-height: 1.5;
}
.figure figcaption strong { color: var(--ink-2); font-weight: 600; }

.figure.wide { margin-left: -1rem; margin-right: -1rem; }
@media (min-width: 900px) {
  .figure.wide { margin-left: -2rem; margin-right: -2rem; }
  .figure.wide .figure-img { padding: 1.25rem 1.25rem 0; }
}
.figure.wide img { max-height: 380px; }

/* ── Stat grid ── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0 2.5rem;
}
.stat { background: var(--bg-white); padding: 1.5rem 1.25rem; text-align: center; }
.stat-value {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.stat-label {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-top: 0.35rem;
}

/* ── Tables ── */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-white);
}
table { width: 100%; border-collapse: collapse; font-size: 0.82rem; font-variant-numeric: tabular-nums; }
th, td { padding: 0.6rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border-2); color: var(--ink-2); }
thead th {
  background: var(--bg-card);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-3);
  border-bottom: 1px solid var(--border);
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: var(--accent-soft); }
.num { text-align: right; white-space: nowrap; }
.best { font-weight: 700; color: var(--accent); }
.second { text-decoration: underline; text-underline-offset: 2px; }
.check { color: #1d7c4a; font-weight: 700; }
.cross { color: var(--ink-3); }

/* ── Math ── */
.math-block { overflow-x: auto; padding: 0.5rem 0; }
.katex-display { margin: 0.75rem 0 !important; }

/* ── Caption text ── */
.caption-text { font-size: 0.82rem; color: var(--ink-3); margin-top: 0.4rem; }

/* ── Results side-by-side ── */
.results-side {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 2rem 3rem;
  align-items: start;
  margin-top: 1.5rem;
}
@media (max-width: 760px) { .results-side { grid-template-columns: 1fr; } }

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 2.5rem 3rem;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--ink-3);
}
.footer-inner a { color: var(--ink-3); }
.footer-inner a:hover { color: var(--accent); }
.footer-brand {
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}