* { box-sizing: border-box; margin: 0; }

html {
  background: #fff;
  color: #1a1a1a;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  line-height: 1.7;
}

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 5rem 1.25rem;
  text-align: center;
}

header img { margin-bottom: 1rem; }
header h1 { font-size: 2rem; font-weight: 700; margin: 0; }
.aka { color: #a3a3a3; font-size: 0.85rem; margin-top: 0.35rem; letter-spacing: 0.01em; }
.subtitle { color: #737373; font-size: 0.95rem; margin-top: 0.25rem; }

.lang-switch { display: flex; justify-content: center; gap: 0.5rem; margin: 2rem 0; }
.lang-switch button {
  background: none; border: none; padding: 0.35rem 0.85rem;
  cursor: pointer; font-size: 0.85rem; color: #999;
  font-family: inherit;
}
.lang-switch button.active { color: #1a1a1a; border-bottom: 1.5px solid #1a1a1a; }

section p { margin: 1.5rem 0; color: #404040; }

.links { display: flex; gap: 1.5rem; justify-content: center; margin-top: 3rem; }
.links a { color: #1a1a1a; font-size: 0.95rem; }
.links a:hover { color: #666; }

.page-footer {
  text-align: center;
  color: #999;
  font-size: 0.8rem;
  margin-top: 5rem;
  padding: 0 1.25rem 2rem;
  line-height: 1.5;
}
.page-footer .code-line { font-family: ui-monospace, "SF Mono", Menlo, monospace; margin-bottom: 0.35rem; }
.page-footer .explain { max-width: 520px; margin: 0 auto; font-size: 0.75rem; color: #a3a3a3; }
body[data-lang="ko"] .explain-en { display: none; }
body[data-lang="en"] .explain-ko { display: none; }