:root {
  --bg: #ffffff;
  --panel: #f8f9fa;
  --text: #2c3e50;
  --muted: #6c757d;
  --line: rgba(0, 0, 0, .12);
  --brand: #3498db;
  --shadow: 0 4px 12px rgba(0, 0, 0, .08);
  --radius: 14px;
  --max: 980px;
}

* {
  box-sizing: border-box
}

html,
body {
  height: 100%
}

body {
  margin: 0;
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 15% 0%, rgba(52, 152, 219, .08), transparent 60%),
    radial-gradient(900px 500px at 85% 10%, rgba(46, 204, 113, .06), transparent 60%),
    var(--bg);
}

a {
  color: inherit;
  text-decoration: none
}

a:hover {
  color: var(--brand)
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px
}

.brand {
  font-weight: 700;
  letter-spacing: .2px
}

.nav-links {
  display: flex;
  gap: 14px
}

.nav-links a {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  color: var(--muted);
}

.nav-links a:hover {
  border-color: var(--line);
  color: var(--text)
}

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

.page-header {
  margin: 8px 0 18px
}

.lead {
  color: var(--muted);
  margin: 8px 0 0
}

.section-title {
  margin: 26px 0 12px;
  font-size: 18px;
  color: var(--muted);
  font-weight: 600
}

.card-list {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 12px
}

@media (min-width: 780px) {
  .card-list {
    grid-template-columns: repeat(2, minmax(0, 1fr))
  }
}

.card {
  display: block;
  padding: 16px 16px 14px;
  background: linear-gradient(180deg, rgba(248, 249, 250, .95), rgba(255, 255, 255, .8));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-title {
  font-weight: 700;
  margin: 0 0 6px
}

.card-desc {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 10px
}

.card-meta {
  color: var(--muted);
  font-size: 12px
}

.post {
  max-width: 780px
}

.post-header {
  margin: 10px 0 20px
}

.post-meta {
  color: var(--muted);
  font-size: 13px
}

.muted {
  color: var(--muted)
}

.content {
  color: var(--text)
}

.content h2 {
  margin-top: 28px
}

.content ul {
  padding-left: 18px
}

.content li {
  margin: 6px 0
}

.content code {
  background: rgba(52, 152, 219, .08);
  border: 1px solid rgba(52, 152, 219, .2);
  padding: 2px 6px;
  border-radius: 8px
}