:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #111827;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #60a5fa;
  --border: #1f2937;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
  background: var(--bg);
  color: var(--text);
}
.container { width: min(1080px, 92%); margin: 0 auto; }
a { color: var(--primary); text-decoration: none; }
a:hover { opacity: 0.85; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; }
.brand { font-weight: 700; color: var(--text); }
.site-nav { display: flex; align-items: center; gap: 0.9rem; }
.nav-link { color: var(--muted); font-size: 0.95rem; }
.nav-link.active { color: var(--primary); font-weight: 600; }
.theme-toggle, .menu-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
}
.menu-toggle { display: none; }

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  margin: 3rem 0 2rem;
  align-items: center;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.hero img { width: 100%; border-radius: 14px; object-fit: cover; aspect-ratio: 4/5; }
.btn-row { display: flex; gap: 0.7rem; flex-wrap: wrap; margin-top: 1.1rem; }
.btn {
  display: inline-block;
  padding: 0.55rem 0.95rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: white; }

.section { margin: 2.5rem 0; }
.section h2 { margin-bottom: 0.75rem; font-size: 1.5rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.tag { border: 1px solid var(--border); color: var(--muted); border-radius: 999px; padding: 0.2rem 0.65rem; font-size: 0.85rem; }
.list-clean { list-style: none; padding: 0; margin: 0; }
.pub-item, .project-item, .news-item { padding: 1rem 0; border-bottom: 1px solid var(--border); }
.meta { color: var(--muted); font-size: 0.92rem; }

.site-footer { margin-top: 2rem; border-top: 1px solid var(--border); padding: 1.4rem 0 2rem; }
.footer-grid { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.social-list { display: flex; gap: 1rem; list-style: none; margin: 0; padding: 0; }

@media (max-width: 860px) {
  .hero, .grid-2 { grid-template-columns: 1fr; }
  .menu-toggle { display: block; }
  .site-nav {
    position: absolute;
    top: 64px;
    right: 4%;
    flex-direction: column;
    align-items: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.7rem;
    display: none;
  }
  .site-nav.open { display: flex; }
}