:root {
  --accent: #183a5a;
  --accent-soft: #e8eef5;
  --ink: #1f2937;
  --muted: #5f6b7a;
  --line: #d9e1ea;
  --surface: #ffffff;
}

body {
  color: var(--ink);
  background: var(--surface);
  font-family: "Source Sans Pro", "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
}

.navbar {
  border-bottom: 1px solid var(--line);
  box-shadow: none;
}

.navbar-title {
  font-weight: 700;
  letter-spacing: 0;
}

.quarto-title-banner {
  background: var(--surface);
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

#title-block-header {
  display: none;
}

.content {
  max-width: 980px;
}

h1,
h2,
h3 {
  color: var(--ink);
  letter-spacing: 0;
}

h1 {
  font-weight: 750;
}

h2 {
  margin-top: 2.5rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.35rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(200px, 0.6fr);
  gap: 2.25rem;
  align-items: center;
  padding: 1.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.hero-copy h1 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  line-height: 1.05;
}

.hero-copy > p:first-of-type {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 1.1rem;
}

.hero-copy p {
  max-width: 680px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-image img {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  display: block;
  margin-left: auto;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.35rem;
}

.btn {
  border-radius: 6px;
  font-weight: 650;
  padding: 0.55rem 0.9rem;
}

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background-color: #102a42;
  border-color: #102a42;
}

.btn-outline-primary,
.btn-outline-secondary {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-outline-primary:hover,
.btn-outline-secondary:hover {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature,
.content-item,
.contact-row,
.talk-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.feature,
.content-item {
  padding: 1.15rem;
}

.feature h3,
.content-item h3 {
  margin-top: 0;
  color: var(--accent);
  font-size: 1.12rem;
}

.content-list,
.contact-panel {
  display: grid;
  gap: 1rem;
}

.keyword-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 1.25rem;
}

.keyword-list code {
  display: inline-block;
  padding: 0.35rem 0.55rem;
}

.compact-list ul {
  margin-bottom: 0;
}

.contact-row {
  padding: 1rem 1.15rem;
}

.contact-row p {
  margin-bottom: 0;
}

.language-switch {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.talk-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.talk-card {
  overflow: hidden;
}

.talk-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.talk-card p {
  padding: 0.9rem 1rem 1rem;
  margin: 0;
  color: var(--muted);
}

code {
  color: #374151;
  background-color: var(--accent-soft);
  border-radius: 4px;
  padding: 0.1rem 0.25rem;
}

footer.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-note {
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1rem;
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-top: 1rem;
  }

  .hero-image {
    order: -1;
  }

  .hero-image img {
    max-width: 220px;
    margin: 0;
  }

  .talk-gallery {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .btn {
    text-align: center;
  }
}