:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #1f2933;
  --muted: #6b7280;
  --accent: #2f5d8a;
  --accent-soft: #e8eef5;
  --border: #e2e6ea;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
  line-height: 1.6;
}

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

/* Header / nav */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 0.9rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: baseline; gap: 0.6rem; }
.brand:hover { text-decoration: none; }
.brand-title { font-weight: 700; font-size: 1.15rem; color: var(--ink); }
.brand-tag {
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
}
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  display: block;
  padding: 0.35rem 0.7rem;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}
.site-nav a:hover { background: var(--accent-soft); text-decoration: none; }
.site-nav .active a { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* Layout */
.container { max-width: 980px; margin: 0 auto; padding: 2rem 1.5rem 3rem; }

.hero { text-align: center; padding: 2rem 0 1rem; }
.hero h1 { font-size: 2rem; margin: 0 0 0.25rem; }
.hero .subtitle { color: var(--accent); font-weight: 600; margin: 0 0 0.75rem; }
.hero .mission { color: var(--muted); max-width: 640px; margin: 0 auto; }

/* Home grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 1.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--ink);
  text-align: center;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.tile:hover {
  transform: translateY(-2px);
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}
.tile-icon { font-size: 1.8rem; }
.tile-label { font-weight: 600; font-size: 0.95rem; }

/* Section page */
.page-title { font-size: 1.6rem; margin: 0 0 0.5rem; }
.intro { color: var(--muted); margin: 0 0 1.5rem; }
.cards { display: grid; gap: 1rem; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.25rem;
}
.card-date { font-size: 0.8rem; color: var(--accent); font-weight: 600; }
.card-heading { margin: 0.2rem 0 0.4rem; font-size: 1.1rem; }
.card-body { margin: 0; color: var(--ink); white-space: pre-line; }
.empty { color: var(--muted); }

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border);
}