:root {
  --color-paper: #f6f3ec;
  --color-chrome: #efebe3;
  --color-text: #1a1916;
  --color-text-secondary: #3f3c36;
  --color-muted: #6b665c;
  --color-border: #e3ddd2;
  --color-border-strong: #d4cdbf;
  --color-surface: #f6f3ec;
  --color-surface-hover: #e8e2d6;
  --color-accent: #3f5b4d;
  --radius-sm: 6px;
  --radius-md: 8px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --font-sans: "Inter Variable", "Inter", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --font-serif: "Source Serif 4 Variable", "Source Serif 4", "Yu Mincho", "Hiragino Mincho ProN",
    "MS Mincho", serif;
  font-size: 13px;
}

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

html {
  height: 100%;
}

body.site-page {
  display: flex;
  flex-direction: column;
  height: 100%;
  height: 100dvh;
  min-height: 0;
  margin: 0;
  overflow: hidden;
  background: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app-topbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  min-height: 44px;
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-chrome);
  z-index: 2;
}

.app-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.app-brand:focus-visible {
  outline: 2px solid #8aa392;
  outline-offset: 2px;
}

.app-sitemark-wrap {
  display: inline-flex;
  flex-shrink: 0;
  color: var(--color-accent);
}

.app-sitemark {
  display: block;
}

.app-wordmark {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  white-space: nowrap;
}

.app-wordmark--chrome {
  flex-shrink: 0;
  font-size: 0.95rem;
  line-height: 1.2;
}

.app-topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
  flex-shrink: 0;
}

.locale-switch {
  display: inline-flex;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.locale-switch__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 1.625rem;
  padding: 0 7px;
  border: none;
  background: transparent;
  color: var(--color-muted);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    color 0.15s ease;
}

a.locale-switch__btn:visited {
  color: var(--color-muted);
}

.locale-switch__btn + .locale-switch__btn {
  border-left: 1px solid var(--color-border);
}

.locale-switch__btn:hover:not([aria-pressed="true"]) {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.locale-switch__btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: #fff;
  cursor: default;
}

.locale-switch__btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.app-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 0.35rem;
  flex-shrink: 0;
  padding: 6px var(--space-4) 8px;
  border-top: 1px solid var(--color-border);
  background: var(--color-chrome);
  z-index: 2;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

.app-legal__name {
  font-weight: 500;
  color: var(--color-muted);
}

.app-legal a {
  color: var(--color-accent);
  text-decoration: none;
}

.app-legal a:hover {
  text-decoration: underline;
}

.site-doc {
  flex: 1;
  min-height: 0;
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
  overflow: auto;
  padding: 32px 20px;
  line-height: 1.7;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-strong) transparent;
}

.site-doc::-webkit-scrollbar {
  width: 3px;
}

.site-doc::-webkit-scrollbar-track {
  background: transparent;
}

.site-doc::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 999px;
}

.site-doc h1 {
  font-size: 1.4rem;
}

.site-doc h2 {
  margin-top: 2rem;
  font-size: 1.05rem;
}

.site-doc a {
  color: var(--color-accent);
}

.site-doc .note {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.site-doc figure {
  margin: 1.25rem 0 0;
}

.site-doc figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
}

.site-doc figcaption {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.site-doc .cta {
  margin: 2rem 0 0;
}

.site-doc dt {
  margin-top: 1rem;
  font-weight: 600;
}

.site-doc dd {
  margin: 0.25rem 0 0;
}

@media (max-width: 960px) {
  .app-topbar {
    flex-wrap: wrap;
    height: auto;
    padding: var(--space-2) var(--space-3);
  }
}