:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #5c5c5c;
  --border: #e2e2e2;
  --accent: #0a0a0a;
  --table-stripe: #f7f7f7;
  --code-bg: #f2f2f2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --fg: #ededed;
    --muted: #a3a3a3;
    --border: #262626;
    --accent: #ededed;
    --table-stripe: #151515;
    --code-bg: #171717;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR",
    "Noto Sans JP", "Malgun Gothic", "Hiragino Kaku Gothic ProN", Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

header.site {
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

header.site .wrap {
  padding-top: 24px;
  padding-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--fg);
  letter-spacing: -0.01em;
}

nav.switch {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

nav.switch a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

nav.switch a.active {
  color: var(--fg);
  border-bottom-color: var(--fg);
}

nav.switch a:hover { color: var(--fg); }

nav.switch .sep {
  color: var(--border);
}

h1 {
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2.4em;
  padding-top: 1.2em;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1rem;
  margin-top: 1.8em;
}

.meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 2.2em;
}

.meta div { margin: 2px 0; }

p, li { color: var(--fg); }

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

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.92rem;
}

caption {
  text-align: left;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--table-stripe);
  font-weight: 600;
  white-space: nowrap;
}

tbody tr:nth-child(even) { background: var(--table-stripe); }

.callout {
  border: 1px solid var(--border);
  background: var(--table-stripe);
  padding: 14px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
  margin: 1.2em 0;
}

.callout.legal-note {
  font-size: 0.82rem;
  color: var(--muted);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  white-space: pre-wrap;
}

footer.site {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
}

footer.site .wrap { padding: 0; max-width: 760px; }

.toc {
  font-size: 0.88rem;
  columns: 2;
  column-gap: 24px;
}

@media (max-width: 640px) {
  .toc { columns: 1; }
  h1 { font-size: 1.35rem; }
}

.toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  padding: 2px 0;
}

.toc a:hover { color: var(--fg); }

/* Account deletion page */

.authbuttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 1.2em 0;
}

.authform {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 360px;
  margin-top: 2em;
}

.authform p { margin: 0; font-size: 0.88rem; }

button,
input[type="email"],
input[type="password"],
input[type="text"] {
  font: inherit;
  font-size: 0.95rem;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}

input[type="text"] { max-width: 360px; width: 100%; display: block; }

button {
  cursor: pointer;
  font-weight: 600;
}

button:hover:not(:disabled) { border-color: var(--fg); }

button:disabled,
input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button.danger {
  border-color: #c0392b;
  color: #c0392b;
}

button.danger:hover:not(:disabled) {
  background: #c0392b;
  border-color: #c0392b;
  color: #ffffff;
}

.checkline {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 1.2em 0;
  font-size: 0.95rem;
}

.checkline input { margin-top: 5px; }

.home {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.home .card {
  max-width: 420px;
  padding: 40px;
}

.home h1 { font-size: 1.4rem; }

.langgrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
}

.langgrid a {
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-decoration: none;
  color: var(--fg);
}

.langgrid a:hover { border-color: var(--fg); }

.langgrid small {
  display: block;
  color: var(--muted);
  font-weight: 400;
  margin-top: 4px;
}