@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

:root {
  --bg:           #111827;
  --surface:      #1f2937;
  --surface-2:    #263040;
  --border:       #374151;
  --text:         #f9fafb;
  --text-muted:   #9ca3af;
  --accent:       #6366f1;
  --accent-hover: #818cf8;
  --nav-bg:       rgba(17, 24, 39, 0.92);
  --thumb-bg:     #0d1117;
  --font:         'Inter', system-ui, -apple-system, sans-serif;
  --max-w:        860px;
  --nav-h:        60px;
}

[data-theme="light"] {
  --bg:           #f8f9fa;
  --surface:      #ffffff;
  --surface-2:    #f1f3f5;
  --border:       #dee2e6;
  --text:         #111827;
  --text-muted:   #6b7280;
  --accent:       #4f46e5;
  --accent-hover: #6366f1;
  --nav-bg:       rgba(248, 249, 250, 0.92);
  --thumb-bg:     #f1f3f5;
}

/* Badge overrides for light mode */
[data-theme="light"] .badge-nature   { background: #ede9fe; color: #5b21b6; }
[data-theme="light"] .badge-oral     { background: #dcfce7; color: #15803d; }
[data-theme="light"] .badge-conf     { background: #dbeafe; color: #1d4ed8; }
[data-theme="light"] .badge-journal  { background: #dbeafe; color: #1d4ed8; }
[data-theme="light"] .badge-preprint { background: #f3f4f6; color: #374151; border: 1px solid #e5e7eb; }
[data-theme="light"] .badge-thesis   { background: #fef3c7; color: #92400e; }
[data-theme="light"] .badge-intern   { background: #fef3c7; color: #92400e; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--accent-hover); }

/* Layout */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

main {
  padding-top: calc(var(--nav-h) + 48px);
  padding-bottom: 80px;
}

.section { margin-bottom: 64px; }

.section-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: middle;
  white-space: nowrap;
}
.badge-nature   { background: #3b1e6e; color: #c4b5fd; }
.badge-oral     { background: #14532d; color: #86efac; }
.badge-conf     { background: #1e3a5f; color: #93c5fd; }
.badge-journal  { background: #1e3a5f; color: #93c5fd; }
.badge-preprint { background: #374151; color: #d1d5db; }
.badge-thesis   { background: #292524; color: #d6d3d1; }
.badge-intern   { background: #292524; color: #d6d3d1; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent-hover); }

/* Skip to content */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 12px;
  z-index: 100;
  border-radius: 0 0 4px 0;
  font-size: 14px;
}
.skip-link:focus { top: 0; }

img { max-width: 100%; height: auto; display: block; }

/* Shared link pill button */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 14px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 500;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.15s;
  cursor: pointer;
}
.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.highlight { font-weight: 700; color: var(--text); }
.muted { color: var(--text-muted); }