/* braingate components — plain HTML + CSS for the static site.
   Colours, spacing and radii come from tokens.css (var(--…)).
   Type sizes mirror the type styles in tokens.json. All classes are prefixed brg-.
   Language: set lang="ja" or lang="en" on <html> (or on any element); :lang() rules below
   switch typesetting. Fonts: --font-display (Montserrat → IBM Plex Sans JP) for brand/UI,
   --font-sans (IBM Plex Sans JP) for reading, --font-mono (IBM Plex Mono) for code. */

:root {
  --brg-measure: 680px;   /* article column */
  --brg-wide: 1040px;     /* header, footer, lists */
}

.brg-page {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 30px;
  -webkit-font-smoothing: antialiased;
}
.brg-page:lang(ja) { line-break: strict; word-break: normal; }
.brg-page:lang(en) { font-size: 17px; line-height: 28px; hyphens: manual; }
.brg-page *, .brg-page *::before, .brg-page *::after { box-sizing: border-box; }
.brg-page :focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: var(--radius-sm); }
.brg-container { max-width: var(--brg-wide); margin: 0 auto; padding: 0 var(--space-4); }
.brg-measure { max-width: var(--brg-measure); margin: 0 auto; padding: 0 var(--space-4); }

/* ---------- Site header ---------- */
.brg-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.brg-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); min-height: 72px; flex-wrap: wrap; padding-top: var(--space-2); padding-bottom: var(--space-2); }
.brg-header__logo { display: block; line-height: 0; }
.brg-header__end { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.brg-header__logo img { height: 28px; width: auto; }
.brg-logo--reverse { display: none; }
[data-theme="dark"] .brg-logo--default { display: none; }
[data-theme="dark"] .brg-logo--reverse { display: block; }
.brg-nav { display: flex; gap: var(--space-4); margin: 0; padding: 0; list-style: none; }
.brg-nav a { color: var(--ink); text-decoration: none; font-family: var(--font-display); font-size: 14px; line-height: 24px; font-weight: 600; padding: var(--space-1) 0; border-bottom: 2px solid transparent; }
.brg-nav a:hover { color: var(--action); }
.brg-nav a[aria-current="page"] { color: var(--action); border-bottom-color: var(--action); }

/* ---------- Site footer ---------- */
.brg-footer { border-top: 1px solid var(--border); margin-top: var(--space-6); padding: var(--space-5) 0; color: var(--ink-muted); font-family: var(--font-display); font-size: 14px; line-height: 24px; }
.brg-footer__inner { display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.brg-footer__brand { display: flex; align-items: center; gap: var(--space-2); }
.brg-footer__brand img { width: 28px; height: auto; }
.brg-footer__links { display: flex; gap: var(--space-4); list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.brg-footer a { color: var(--ink-muted); text-decoration: none; }
.brg-footer a:hover { color: var(--action); text-decoration: underline; }

/* ---------- Button ---------- */
.brg-button { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); min-height: 44px; padding: 0 var(--space-4); border-radius: var(--radius-full); border: 1px solid transparent; font: inherit; font-family: var(--font-display); font-size: 15px; line-height: 24px; font-weight: 600; text-decoration: none; cursor: pointer; }
.brg-button--primary { background: var(--action); color: var(--on-action); }
.brg-button--primary:hover { background: var(--ink-strong); color: var(--surface); }
.brg-button--secondary { background: var(--surface); color: var(--ink-strong); border-color: var(--border-strong); }
.brg-button--secondary:hover { border-color: var(--action); color: var(--action); }
.brg-link { color: var(--action); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.brg-link:hover { text-decoration-thickness: 2px; }

/* ---------- Category & tag ---------- */
.brg-category { display: inline-flex; align-items: center; gap: var(--space-2); color: var(--action); font-family: var(--font-display); font-size: 13px; line-height: 20px; font-weight: 600; text-decoration: none; }
.brg-category::before { content: ""; width: 10px; height: 10px; background: currentColor; flex: none; }
.brg-category--ai::before { border-radius: var(--radius-full); }
.brg-category--programming::before { border-radius: 0; }
.brg-category--form::before { clip-path: polygon(50% 0, 100% 100%, 0 100%); }
.brg-category--expression::before { border-radius: 10px 0 0 0; }
.brg-category:hover { text-decoration: underline; text-underline-offset: 3px; }
.brg-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.brg-tag { display: inline-block; padding: 2px 10px; border-radius: var(--radius-full); background: var(--surface-subtle); color: var(--ink); font-size: 12px; line-height: 20px; text-decoration: none; }
.brg-tag::before { content: "#"; color: var(--ink-muted); margin-right: 1px; }
a.brg-tag:hover { background: var(--surface-tint); }

/* ---------- Dates ---------- */
.brg-dates { display: flex; flex-wrap: wrap; gap: var(--space-3); color: var(--ink-muted); font-family: var(--font-display); font-size: 13px; line-height: 20px; font-variant-numeric: tabular-nums; }
.brg-dates dt { display: inline; margin: 0; }
.brg-dates dd { display: inline; margin: 0 0 0 var(--space-1); }

/* ---------- Post list ---------- */
.brg-postlist { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--border); }
.brg-postcard { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-4); padding: var(--space-4) 0; border-bottom: 1px solid var(--border); }
.brg-postcard--thumb { grid-template-columns: minmax(0, 1fr) 160px; }
.brg-postcard__body { display: flex; flex-direction: column; gap: var(--space-2); }
.brg-postcard__title { margin: 0; font-size: 20px; line-height: 30px; font-weight: 600; }
.brg-postcard__title:lang(ja) { font-feature-settings: "palt" 1; letter-spacing: 0.02em; }
.brg-postcard__title:lang(en) { font-family: var(--font-display); line-height: 28px; }
.brg-postcard__lang { font-family: var(--font-display); font-size: 11px; line-height: 16px; font-weight: 600; letter-spacing: 0.06em; color: var(--ink-muted); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0 5px; margin-left: var(--space-2); vertical-align: 2px; }
.brg-postcard__title a { color: var(--ink-strong); text-decoration: none; }
.brg-postcard__title a:hover { color: var(--action); text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.brg-postcard__excerpt { margin: 0; font-size: 14px; line-height: 24px; color: var(--ink); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.brg-postcard__thumb { width: 160px; aspect-ratio: 4 / 3; border-radius: var(--radius-md); overflow: hidden; background: var(--surface-tint); }
.brg-postcard__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
@media (max-width: 560px) {
  .brg-postcard--thumb { grid-template-columns: minmax(0, 1fr) 96px; }
  .brg-postcard__thumb { width: 96px; }
}

/* ---------- Article header ---------- */
.brg-article-header { padding: var(--space-5) 0 var(--space-4); display: flex; flex-direction: column; gap: var(--space-3); border-bottom: 1px solid var(--border); margin-bottom: var(--space-5); }
.brg-article-header__title { margin: 0; font-size: 32px; line-height: 44px; font-weight: 600; color: var(--ink-strong); letter-spacing: 0.01em; }
.brg-article-header__title:lang(ja) { font-feature-settings: "palt" 1; letter-spacing: 0.02em; }
.brg-article-header__title:lang(en) { font-family: var(--font-display); line-height: 40px; letter-spacing: -0.005em; }
@media (max-width: 560px) { .brg-article-header__title { font-size: 26px; line-height: 36px; } .brg-article-header__title:lang(en) { line-height: 34px; } }

/* ---------- Prose (article body from Markdown) ---------- */
.brg-prose { font-size: 16px; line-height: 30px; color: var(--ink); overflow-wrap: anywhere; }
.brg-prose > * + * { margin-top: var(--space-4); }
.brg-prose > :first-child { margin-top: 0; }
.brg-prose p { margin-bottom: 0; }
.brg-prose h2 { margin: var(--space-5) 0 0; font-size: 24px; line-height: 36px; font-weight: 600; color: var(--ink-strong); }
.brg-prose h3 { margin: var(--space-5) 0 0; font-size: 19px; line-height: 30px; font-weight: 600; color: var(--ink-strong); }
.brg-prose h2 + *, .brg-prose h3 + * { margin-top: var(--space-3); }
.brg-prose a { color: var(--action); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.brg-prose a:hover { text-decoration-thickness: 2px; }
.brg-prose strong { font-weight: 600; color: var(--ink-strong); }
.brg-prose ul, .brg-prose ol { padding-left: 1.5em; margin-bottom: 0; }
.brg-prose li + li { margin-top: var(--space-1); }
.brg-prose li::marker { color: var(--action); }
.brg-prose blockquote { margin-left: 0; margin-right: 0; padding: var(--space-3) var(--space-4); background: var(--surface-tint); border-radius: var(--radius-md); color: var(--ink); }
.brg-prose blockquote > :first-child { margin-top: 0; }
.brg-prose blockquote > :last-child { margin-bottom: 0; }
.brg-prose code { font-family: var(--font-mono); font-size: 0.875em; padding: 2px 6px; border-radius: var(--radius-sm); background: var(--surface-subtle); color: var(--ink-strong); }
.brg-prose pre { margin-left: 0; margin-right: 0; padding: var(--space-3) var(--space-4); background: var(--surface-subtle); border: 1px solid var(--border); border-radius: var(--radius-md); overflow-x: auto; font-size: 14px; line-height: 22px; }
.brg-prose pre code { padding: 0; background: none; font-size: inherit; color: var(--ink); }
.brg-prose figure { margin-left: 0; margin-right: 0; }
.brg-prose img { max-width: 100%; height: auto; border-radius: var(--radius-md); display: block; }
.brg-prose figcaption { margin-top: var(--space-2); color: var(--ink-muted); font-size: 13px; line-height: 20px; }
.brg-prose table { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 24px; display: block; overflow-x: auto; }
.brg-prose th, .brg-prose td { text-align: left; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--border); }
.brg-prose th { background: var(--surface-subtle); color: var(--ink-strong); font-weight: 600; }
.brg-prose:lang(en) { font-size: 17px; line-height: 28px; overflow-wrap: break-word; }
.brg-prose:lang(en) h2 { font-family: var(--font-display); font-size: 24px; line-height: 32px; }
.brg-prose:lang(en) h3 { font-family: var(--font-display); font-size: 19px; line-height: 28px; }
.brg-prose:lang(ja) h2, .brg-prose:lang(ja) h3 { font-feature-settings: "palt" 1; letter-spacing: 0.02em; }
.brg-prose hr { border: 0; border-top: 1px solid var(--border); margin: var(--space-5) 0; }

/* ---------- Pagination ---------- */
.brg-pagination { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: var(--space-4) 0; font-family: var(--font-display); font-size: 14px; line-height: 24px; }
.brg-pagination__pages { display: flex; gap: var(--space-1); list-style: none; margin: 0; padding: 0; }
.brg-pagination__pages a, .brg-pagination__pages span { display: inline-flex; align-items: center; justify-content: center; min-width: 40px; height: 40px; border-radius: var(--radius-full); color: var(--ink); text-decoration: none; font-variant-numeric: tabular-nums; }
.brg-pagination__pages a:hover { background: var(--surface-subtle); }
.brg-pagination__pages [aria-current="page"] { background: var(--surface-tint); color: var(--ink-strong); font-weight: 600; }
.brg-pagination__step { color: var(--action); text-decoration: none; font-weight: 600; }
.brg-pagination__step:hover { text-decoration: underline; text-underline-offset: 3px; }
.brg-pagination__step[aria-disabled="true"] { visibility: hidden; }

/* ---------- Profile ---------- */
.brg-profile { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: var(--space-3) var(--space-4); padding: var(--space-4); border-radius: var(--radius-lg); background: var(--surface-subtle); }
.brg-profile__avatar { width: 64px; height: 64px; border-radius: var(--radius-full); background: var(--surface); display: flex; align-items: center; justify-content: center; }
.brg-profile__avatar img { width: 40px; height: auto; }
.brg-profile__name { margin: 0; font-size: 18px; line-height: 28px; font-weight: 600; color: var(--ink-strong); }
.brg-profile__role { margin: 0; color: var(--ink-muted); font-size: 13px; line-height: 20px; }
.brg-profile__bio { margin: var(--space-2) 0 0; font-size: 14px; line-height: 24px; }
.brg-profile__links { grid-column: 2; display: flex; gap: var(--space-4); flex-wrap: wrap; list-style: none; margin: 0; padding: 0; font-size: 14px; line-height: 24px; }
.brg-profile__links a { color: var(--action); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
@media (max-width: 480px) { .brg-profile__links { grid-column: 1 / -1; } }

/* ---------- Language switch ---------- */
.brg-langswitch { display: inline-flex; padding: 2px; gap: 2px; border: 1px solid var(--border-strong); border-radius: var(--radius-full); font-family: var(--font-display); font-size: 12px; line-height: 20px; font-weight: 600; letter-spacing: 0.06em; }
.brg-langswitch a, .brg-langswitch span { display: inline-flex; align-items: center; justify-content: center; min-width: 36px; padding: 2px 8px; border-radius: var(--radius-full); text-decoration: none; color: var(--ink); }
.brg-langswitch a:hover { background: var(--surface-subtle); color: var(--action); }
.brg-langswitch [aria-current="true"] { background: var(--surface-tint); color: var(--ink-strong); }
.brg-langswitch [aria-disabled="true"] { color: var(--ink-muted); }