/* OriginTheme: child of Base (Bootstrap). Colours are tokens; dark mode swaps them. */
:root {
  --ot-bg: #f7f8fa;
  --ot-surface: #ffffff;
  --ot-ink: #1b2430;
  --ot-muted: #5b6675;
  --ot-line: #e2e6ec;
  --ot-accent: #0f6e6e;
  --ot-accent-ink: #0a4f4f;
  --ot-code-bg: #eef1f5;
  --ot-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", Arial, sans-serif;
  --ot-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter, Georgia, "Noto Serif", "Noto Serif Devanagari", serif;
  --ot-radius: 6px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ot-bg: #11161d;
    --ot-surface: #181f28;
    --ot-ink: #e7ebf0;
    --ot-muted: #9aa6b5;
    --ot-line: #263040;
    --ot-accent: #4fc3c3;
    --ot-accent-ink: #8fdede;
    --ot-code-bg: #1d2631;
    color-scheme: dark;
  }
}

html { scroll-behavior: smooth; }
body {
  background: var(--ot-bg);
  color: var(--ot-ink);
  font-family: var(--ot-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
body > main, body > .ot-wrap { flex: 1 0 auto; }

a { color: var(--ot-accent); text-underline-offset: 0.18em; }
a:hover { color: var(--ot-accent-ink); }
:focus-visible { outline: 2px solid var(--ot-accent); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--ot-accent); color: var(--ot-bg); }

/* Layout */
.ot-wrap { width: 100%; max-width: 920px; margin: 0 auto; padding: 0 1.25rem; }
.ot-wrap--read { max-width: 720px; }

/* Header */
.ot-header { border-bottom: 1px solid var(--ot-line); background: var(--ot-surface); }
.ot-header__inner { display: flex; align-items: center; min-height: 4rem; }
.ot-brand { display: inline-flex; align-items: center; gap: 0.65rem; text-decoration: none; color: var(--ot-ink); }
.ot-brand:hover { color: var(--ot-ink); }
.ot-brand__logo { height: 2rem; width: auto; display: block; }
.ot-brand__name { font-family: var(--ot-serif); font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }

/* Home */
.ot-home { padding-top: 4rem; padding-bottom: 4rem; }
.ot-intro { max-width: 640px; margin-bottom: 3.5rem; }
.ot-intro__title { font-family: var(--ot-serif); font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.1; letter-spacing: -0.02em; font-weight: 700; margin: 0 0 1rem; }
.ot-intro__lead { font-size: 1.15rem; color: var(--ot-muted); margin: 0; }

.ot-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ot-line); }
.ot-list__item { padding: 1.75rem 0; border-bottom: 1px solid var(--ot-line); }
.ot-list__title { font-family: var(--ot-serif); font-size: 1.55rem; line-height: 1.25; margin: 0.25rem 0 0.5rem; font-weight: 700; }
.ot-list__title a { color: var(--ot-ink); text-decoration: none; background: linear-gradient(var(--ot-accent), var(--ot-accent)) 0 100% / 0 2px no-repeat; transition: background-size 0.2s ease; }
.ot-list__title a:hover { background-size: 100% 2px; }
.ot-list__excerpt { color: var(--ot-muted); margin: 0; max-width: 62ch; }
.ot-meta { display: block; font-size: 0.875rem; color: var(--ot-muted); }
.ot-empty { color: var(--ot-muted); border: 1px dashed var(--ot-line); border-radius: var(--ot-radius); padding: 1.5rem; }

/* Article and page */
.ot-article { padding: 3.5rem 0 2rem; }
.ot-article__head { margin-bottom: 2.25rem; }
.ot-article__title { font-family: var(--ot-serif); font-size: clamp(2rem, 4.5vw, 2.9rem); line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; margin: 0.35rem 0 0; }
.ot-article__lead { font-family: var(--ot-serif); font-size: 1.25rem; line-height: 1.55; color: var(--ot-muted); margin: 1rem 0 0; }
.ot-back { padding-bottom: 3.5rem; font-size: 0.95rem; }

/* Prose */
.ot-prose { font-family: var(--ot-serif); font-size: 1.125rem; line-height: 1.8; }
.ot-prose > * + * { margin-top: 1.25em; }
.ot-prose h2, .ot-prose h3, .ot-prose h4 { font-family: var(--ot-serif); line-height: 1.25; letter-spacing: -0.01em; margin-top: 2.2em; margin-bottom: 0; }
.ot-prose h2 { font-size: 1.65rem; }
.ot-prose h3 { font-size: 1.3rem; }
.ot-prose h4 { font-size: 1.1rem; }
.ot-prose img, .ot-prose video { max-width: 100%; height: auto; border-radius: var(--ot-radius); }
.ot-prose blockquote { margin-left: 0; padding: 0.1rem 0 0.1rem 1.25rem; border-left: 3px solid var(--ot-accent); color: var(--ot-muted); font-style: italic; }
.ot-prose hr { border: 0; border-top: 1px solid var(--ot-line); margin: 2.5em 0; opacity: 1; }
.ot-prose code { font-size: 0.9em; background: var(--ot-code-bg); padding: 0.12em 0.4em; border-radius: 4px; }
.ot-prose pre { background: var(--ot-code-bg); padding: 1rem 1.15rem; border-radius: var(--ot-radius); overflow-x: auto; line-height: 1.55; }
.ot-prose pre code { background: none; padding: 0; }
.ot-prose table { width: 100%; border-collapse: collapse; font-family: var(--ot-sans); font-size: 0.95rem; display: block; overflow-x: auto; }
.ot-prose th, .ot-prose td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--ot-line); text-align: left; }
.ot-prose th { font-weight: 600; border-bottom-width: 2px; }
.ot-prose ul, .ot-prose ol { padding-left: 1.4em; }
.ot-prose li + li { margin-top: 0.4em; }

/* Footer */
.ot-footer { border-top: 1px solid var(--ot-line); background: var(--ot-surface); color: var(--ot-muted); font-size: 0.9rem; margin-top: auto; }
.ot-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 1.5rem; padding-top: 1.5rem; padding-bottom: 1.5rem; }
.ot-footer__desc { max-width: 48ch; }

/* Light touch on Bootstrap pieces rendered by Base partials (breadcrumbs, pagination, forms) */
.breadcrumb { --bs-breadcrumb-divider-color: var(--ot-muted); font-size: 0.9rem; }
.page-link { color: var(--ot-accent); background: var(--ot-surface); border-color: var(--ot-line); }
.page-link:hover { color: var(--ot-accent-ink); background: var(--ot-code-bg); border-color: var(--ot-line); }
.page-item.active .page-link { background: var(--ot-accent); border-color: var(--ot-accent); color: var(--ot-bg); }
.btn-primary { --bs-btn-bg: var(--ot-accent); --bs-btn-border-color: var(--ot-accent); --bs-btn-hover-bg: var(--ot-accent-ink); --bs-btn-hover-border-color: var(--ot-accent-ink); --bs-btn-color: var(--ot-bg); --bs-btn-hover-color: var(--ot-bg); --bs-btn-active-bg: var(--ot-accent-ink); --bs-btn-active-border-color: var(--ot-accent-ink); --bs-btn-active-color: var(--ot-bg); }
.form-control { background: var(--ot-surface); color: var(--ot-ink); border-color: var(--ot-line); }
.form-control:focus { background: var(--ot-surface); color: var(--ot-ink); border-color: var(--ot-accent); box-shadow: 0 0 0 0.2rem color-mix(in srgb, var(--ot-accent) 25%, transparent); }
.breadcrumb-item.active{ color: #ffffff; }

@media (max-width: 575.98px) {
  .ot-home { padding-top: 2.5rem; }
  .ot-article { padding-top: 2.25rem; }
  .ot-prose { font-size: 1.05rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}