:root {
  --fg: #1f2328;
  --muted: #59636e;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --border: #d1d9e0;
  --accent: #004191; /* KAIST blue */
  --maxw: 1080px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans KR", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); font-weight: 400; }

.site-header { border-bottom: 1px solid var(--border); background: var(--bg); }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; min-height: 56px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--accent); }
.brand:hover { text-decoration: none; }
.brand img { display: block; height: 24px; width: auto; }
.site-header nav a { margin-left: 20px; color: var(--muted); }
.site-header nav a:first-child { margin-left: 0; }
.site-header nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

main.container { padding-top: 32px; padding-bottom: 48px; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 1.4rem; margin: 40px 0 16px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 760px; }
.hero { padding: 16px 0 8px; }
.areas { padding-left: 20px; }
.areas li { margin-bottom: 8px; }

/* Project cards: one per row (vertical stack). Whole card is clickable via .card-link::after */
.cards { display: flex; flex-direction: column; gap: 20px; }
.card {
  position: relative; display: flex; align-items: stretch;
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover, .card:focus-within {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(0, 65, 145, .12);
}
.card-thumb { flex: 0 0 320px; background: var(--bg-soft); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.card-thumb img { width: 100%; height: 100%; object-fit: contain; display: block; transition: transform .3s ease; }
.card:hover .card-thumb img { transform: scale(1.04); }
.card-body { flex: 1; padding: 18px 22px; min-width: 0; }
.card-body p { margin: 0 0 8px; }
.venue { display: inline-block; font-size: 0.8rem; font-weight: 600; color: var(--accent); background: #e6eef7; border-radius: 4px; padding: 1px 8px; }
.card-title { font-size: 1.15rem; line-height: 1.35; margin: 4px 0 6px; }
.card-title a { color: var(--fg); transition: color .18s ease; }
.card:hover .card-title a { color: var(--accent); }
.card-link::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.card-link:hover { text-decoration: none; }
.authors { font-size: 0.9rem; color: var(--muted); }
.summary { font-size: 0.95rem; }
.links { font-size: 0.9rem; position: relative; z-index: 2; }

.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); color: var(--muted); font-size: 0.9rem; padding: 20px 0; }
.site-footer p { margin: 4px 0; }

.at { color: var(--accent); }

@media (max-width: 700px) {
  h1 { font-size: 1.6rem; }
  .card { flex-direction: column; }
  .card-thumb { flex-basis: auto; aspect-ratio: 2 / 1; }
}
@media (prefers-reduced-motion: reduce) {
  .card, .card-thumb img, .card-title a { transition: none; }
  .card:hover { transform: none; }
}