:root {
  --bg: #0b0f14;
  --bg-elevated: #121821;
  --text: #e8eef7;
  --muted: #9aabbd;
  --accent: #6ee7c5;
  --accent-dim: #2f6f5f;
  --border: #243041;
  --danger: #f0a8a8;
  --max: 44rem;
  --font: "IBM Plex Sans", "Noto Sans KR", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, #163028 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1a2435 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: #b7ffe9;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--accent);
  color: #04231a;
  padding: 0.5rem 0.8rem;
  border-radius: 0.35rem;
  z-index: 10;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.site-footer,
main {
  width: min(100% - 2rem, 64rem);
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0 0.5rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 650;
}

.brand-name-ko {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a[aria-current="page"],
.nav a:hover,
.nav a:focus-visible {
  color: var(--text);
}

main {
  padding: 2rem 0 4rem;
}

.hero {
  display: grid;
  gap: 1.25rem;
  padding: 1.5rem 0 2rem;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 650;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin: 0;
  max-width: 18ch;
}

.lede {
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0;
}

.panel {
  background: color-mix(in srgb, var(--bg-elevated) 92%, black);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1.35rem;
}

.grid-2 {
  display: grid;
  gap: 1rem;
}

@media (min-width: 760px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .grid-2 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.meta-list,
.source-list,
.rule-list {
  margin: 0;
  padding-left: 1.15rem;
}

.meta-list li,
.source-list li,
.rule-list li {
  margin: 0.35rem 0;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 0.4rem;
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card-link:hover,
.card-link:focus-visible {
  border-color: var(--accent-dim);
  transform: translateY(-1px);
}

.card-link h2 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}

.card-link p {
  margin: 0;
  color: var(--muted);
}

.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  color: var(--muted);
  margin-bottom: 0.7rem;
}

.section {
  margin-top: 2.25rem;
}

.section h2 {
  margin: 0 0 0.8rem;
  font-size: 1.35rem;
}

.prose p {
  max-width: var(--max);
}

.prose h2 {
  margin-top: 2rem;
}

.reading-key {
  display: grid;
  gap: 0;
  margin: 0;
}

.reading-key div {
  display: grid;
  grid-template-columns: minmax(7rem, 0.32fr) 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--border);
}

.reading-key div:first-child {
  border-top: 0;
  padding-top: 0;
}

.reading-key div:last-child {
  padding-bottom: 0;
}

.reading-key dt {
  font-weight: 650;
}

.reading-key dd {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 480px) {
  .reading-key div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

.note {
  border-left: 3px solid var(--accent-dim);
  padding-left: 0.9rem;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0.35rem 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}