:root {
  --bg: #0b0f14;
  --fg: #e7edf5;
  --muted: #a8b3c2;
  --card: #121826;
  --border: #223047;
  --accent: #7aa2ff;
  --code: #0f1522;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  border-bottom: 1px solid var(--border);
  background: radial-gradient(1200px 420px at 30% -10%, rgba(122,162,255,.25), transparent 60%),
              radial-gradient(900px 340px at 80% 0%, rgba(122,255,204,.14), transparent 55%);
  padding: 48px 0 24px;
}

.hero-top {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 900px) {
  .hero-top { grid-template-columns: 1fr; }
}

h1 {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1.15;
}

.subtitle {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 18px;
}

.meta {
  margin: 8px 0 14px;
  padding-left: 2px;
  font-size: 14px;
}

/* Links in the header meta block */
.meta-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
}

.meta-link:hover {
  border-bottom-color: var(--accent);
}

.badges { display: flex; flex-wrap: wrap; gap: 8px; }
.badge {
  border: 1px solid var(--border);
  background: rgba(18,24,38,.65);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--fg);
}

.hero-card {
  border: 1px solid var(--border);
  background: rgba(18,24,38,.65);
  border-radius: 14px;
  padding: 16px;
}

.smallcaps {
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--muted);
}

.nav {
  margin-top: 18px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
}

.nav a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.nav a[aria-current="page"] {
  color: #111827;
  background: rgba(199,210,254,.18);
  border-radius: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(199,210,254,.45);
  border-bottom: 1px solid rgba(199,210,254,.45);
}

.local-nav {
  margin-top: 22px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(15,21,34,.55);
}

.tags {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(122,162,255,.45);
  background: rgba(122,162,255,.12);
  color: rgba(240,244,255,.95);
  font-size: 12px;
}

main { padding: 30px 0 60px; }

h2 { margin: 34px 0 10px; font-size: 26px; }
h3 { margin: 0 0 8px; font-size: 18px; }
.subhead { margin-top: 18px; }

.muted { color: var(--muted); }

.equation {
  margin: 8px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(15,21,34,.6);
  overflow-x: auto;
}

.note {
  margin: 12px 0;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(122,162,255,.35);
  background: rgba(122,162,255,.10);
}

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

@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr; }
}

.grid2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

@media (max-width: 900px) {
  .grid2 { grid-template-columns: 1fr; }
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 14px;
  padding: 14px 14px 12px;
}

pre {
  margin: 10px 0 0;
  border: 1px solid var(--border);
  background: rgba(15,21,34,.9);
  padding: 12px;
  border-radius: 12px;
  overflow-x: auto;
}

code {
  background: rgba(15,21,34,.9);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 8px;
}

.footer {
  margin-top: 46px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

/* --- Added for /research pages --- */

/* General link styling inside main content */
main a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
}

main a:hover {
  border-bottom-color: var(--accent);
}

/* Tables (results + comparisons) */
.tablewrap {
  margin: 10px 0;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(15,21,34,.6);
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

/* Research index table: keep columns readable (horizontal scroll if needed) */
table.papers { min-width: 1120px; }
table.papers td.paper-col { min-width: 360px; }

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  vertical-align: top;
}

th {
  background: rgba(18,24,38,.65);
  text-align: left;
}

/* --- Research UI controls (inputs/buttons) --- */
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }

.input, .select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--fg);
  outline: none;
}

/* Improve native select dropdown visibility in dark theme */
.select{color-scheme:dark;}
.select option{background-color:var(--code);color:var(--fg);}
.select option:disabled{color:var(--muted);}
.input { width: 100%; }
.select { min-width: 160px; }

.btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.06);
  color: var(--fg);
  cursor: pointer;
  font-weight: 600;
}
.btn:hover { background: rgba(255,255,255,0.10); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.primary {
  background: rgba(120,170,255,0.18);
  border-color: rgba(120,170,255,0.35);
}
.btn.primary:hover { background: rgba(120,170,255,0.26); }

.papers .muted.small { font-size: 12px; margin-top: 6px; }

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
}
.badge-curated { background: rgba(70, 200, 140, 0.12); border-color: rgba(70, 200, 140, 0.35); }
.badge-index { background: rgba(255, 200, 120, 0.10); border-color: rgba(255, 200, 120, 0.28); }

.nowrap { white-space: nowrap; }
.center { text-align: center; }


/* Clickable ASCII tree */
pre.ascii-tree a{color:#93c5fd;text-decoration:none;}
pre.ascii-tree a:hover{color:#bfdbfe;text-decoration:underline;}


/* --- Home: intro card --- */
#intro{
  border: 1px solid var(--border);
  background: rgba(18,24,38,.45);
  border-radius: 18px;
  padding: 18px 18px 14px;
}
#intro p{margin-top:10px;}
#intro em{color:var(--accent); font-style: italic;}


/* Improve native <select> dropdown visibility in dark theme (cross-browser) */
select{color-scheme:dark;}
select option{background-color:var(--code);color:var(--fg);} 
select option:disabled{color:var(--muted);} 
select optgroup{background-color:var(--code);color:var(--fg);}