/* Mark Velednitsky — personal site theme
   Self-contained, no external CDNs. Mobile-first, respects the OS dark mode. */

:root {
  --accent: #0d7d84;
  --accent-soft: #e5f2f3;
  --bg: #ffffff;
  --bg-soft: #f4f6f7;
  --text: #1b2733;
  --muted: #5b6b78;
  --border: #e2e7ea;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 12px;
  --maxw: 820px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #34c0cc;
    --accent-soft: #0f2a2e;
    --bg: #0f141a;
    --bg-soft: #161d26;
    --text: #e6edf3;
    --muted: #9aa7b4;
    --border: #26303b;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-soft);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(8px);
}
.nav .brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.nav .brand:hover { text-decoration: none; }
.nav .links {
  display: flex;
  gap: 18px;
  font-size: .95rem;
  flex-wrap: wrap;
}
.nav .links a { color: var(--muted); }
.nav .links a:hover { color: var(--accent); text-decoration: none; }

/* ---- Layout ---- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

/* ---- Identity / hero ---- */
.identity {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.identity img {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-soft);
  box-shadow: var(--shadow);
}
.identity h1 { margin: 0 0 2px; font-size: 1.9rem; }
.identity .role { margin: 0; color: var(--muted); font-size: 1.05rem; }
.identity .loc { margin: 4px 0 0; color: var(--muted); font-size: .9rem; }
.identity .quick { margin: 12px 0 0; font-size: .9rem; }
.identity .quick a { margin-right: 16px; }

/* ---- Cards / sections ---- */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin-bottom: 24px;
}
.card h2 {
  margin: 0 0 14px;
  font-size: .85rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.card p { margin: 0 0 12px; }
.card p:last-child { margin-bottom: 0; }

/* ---- Publications ---- */
.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.pubs li:last-child { border-bottom: none; }
.pubs .title { font-weight: 600; color: var(--text); }
.pubs .venue { color: var(--muted); font-size: .92rem; font-style: italic; }
.pubs .links { margin-top: 6px; font-size: .9rem; }
.pubs .links a + a { margin-left: 16px; }
.pubs .links a + a::before {
  content: "·";
  color: var(--muted);
  margin-right: 16px;
}
.pubs .more { margin-top: 16px; font-weight: 600; }

/* ---- Blog list ---- */
.blog-list { list-style: none; margin: 0; padding: 0; }
.blog-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.blog-list li:last-child { border-bottom: none; }
.blog-list .date { color: var(--muted); font-size: .9rem; white-space: nowrap; }
.blog-list .entry a { font-weight: 600; }

/* ---- Link list (homepage hub) ---- */
.link-list { list-style: none; margin: 0; padding: 0; }
.link-list li { border-bottom: 1px solid var(--border); }
.link-list li:last-child { border-bottom: none; }
.link-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 0;
  font-size: 1.05rem;
  color: var(--text);
}
.link-list a:hover { text-decoration: none; color: var(--accent); }
.link-list .lbl { font-weight: 600; }
.link-list .hint { color: var(--muted); font-size: .9rem; }

/* ---- Article (blog post) ---- */
.article {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 36px;
}
.article > :first-child { margin-top: 0; }
.article h1 { font-size: 1.8rem; }
.article h2 { margin-top: 1.8em; }
.article pre {
  background: var(--bg-soft);
  padding: 12px 14px;
  border-radius: 8px;
  overflow-x: auto;
}
.article .back { display: inline-block; margin-bottom: 16px; font-size: .9rem; color: var(--muted); }

/* ---- Footer ---- */
footer {
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  padding: 28px 24px 40px;
}
footer a { color: var(--muted); }

/* ---- Small screens ---- */
@media (max-width: 600px) {
  .identity { justify-content: center; text-align: center; }
  .identity .quick a { margin-right: 10px; }
  .article { padding: 22px 18px; }
  .blog-list li { flex-direction: column; gap: 4px; }
}