/* ==========================================================================
   灰度 — premium grey blog stylesheet
   --------------------------------------------------------------------------
   Design rules, in priority order:
     1. Whitespace over decoration. Hierarchy comes from size and weight,
        not from colour or shadow.
     2. Greys only, plus ONE accent used sparingly (links, hover, selected).
     3. Square corners or 4px. Hairline 1px dividers. No drop shadows -
        cards are a 1px border on a very slightly lighter fill.
     4. Motion is transitions only (opacity / translateY, 200-300ms).
   Layered as: tokens -> reset -> base type -> components -> layouts -> admin.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */
:root {
  --bg:            #F5F5F5;
  --surface:       #FAFAFA;
  --surface-sunk:  #EFEFEF;
  --text:          #2C2C2C;
  --text-strong:   #1A1A1A;
  --muted:         #8A8A8A;
  --faint:         #A8A8A8;
  --border:        #E0E0E0;
  --border-strong: #C9C9C9;
  --accent:        #3D4F5F;
  --accent-soft:   rgba(61, 79, 95, 0.08);
  --danger:        #8C4A4A;
  --danger-soft:   rgba(140, 74, 74, 0.08);

  --font-serif: "Source Han Serif SC", "Source Han Serif CN", "Noto Serif CJK SC",
                "Noto Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans:  "Source Han Sans SC", "Source Han Sans CN", "Noto Sans CJK SC",
                "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono:  "JetBrains Mono", "SFMono-Regular", Menlo, Consolas,
                "Liberation Mono", "Courier New", monospace;

  --radius: 4px;
  --shell: 720px;         /* reading column */
  --shell-wide: 1080px;   /* page chrome */
  --shell-narrow: 560px;  /* forms */

  --leading: 1.75;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 240ms;
}

[data-theme="dark"] {
  --bg:            #1A1A1A;
  --surface:       #202020;
  --surface-sunk:  #242424;
  --text:          #E8E8E8;
  --text-strong:   #F5F5F5;
  --muted:         #8A8A8A;
  --faint:         #6E6E6E;
  --border:        #303030;
  --border-strong: #3D3D3D;
  /* The light-mode ink blue does not hold enough contrast on #1A1A1A, so the
     dark theme lifts the same hue instead of switching to a new colour. */
  --accent:        #9DB2C4;
  --accent-soft:   rgba(157, 178, 196, 0.10);
  --danger:        #C08A8A;
  --danger-soft:   rgba(192, 138, 138, 0.10);
  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;   /* clears the sticky header on anchor jumps */
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: var(--leading);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

img, svg, video { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; padding: 0; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;                 /* the 700 vs 400 contrast carries hierarchy */
  line-height: 1.35;
  letter-spacing: -0.012em;
  color: var(--text-strong);
  margin: 0;
}

p { margin: 0; }

a { color: var(--accent); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--text-strong); }

hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

::selection { background: var(--accent-soft); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Accessibility helpers */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  padding: 12px 18px; background: var(--text-strong); color: var(--bg);
}
.skip-link:focus { left: 12px; top: 12px; }

/* --------------------------------------------------------------------------
   3. Layout shells
   -------------------------------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}
.shell--wide { max-width: var(--shell-wide); }
.shell--narrow { max-width: var(--shell-narrow); }

.site-main { min-height: 60vh; padding-bottom: 96px; }

/* --------------------------------------------------------------------------
   4. Header / nav
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 68px;
}

.brand { display: flex; flex-direction: column; gap: 1px; color: var(--text-strong); }
.brand:hover { color: var(--accent); }
.brand__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
}
.brand__tag {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav__link {
  position: relative;
  padding: 8px 12px;
  color: var(--muted);
  font-size: 0.9375rem;
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-nav__link:hover { color: var(--text-strong); background: var(--accent-soft); }
.site-nav__link.is-active { color: var(--text-strong); font-weight: 500; }
.site-nav__link.is-active::after {
  content: "";
  position: absolute; left: 12px; right: 12px; bottom: 2px;
  height: 1px; background: var(--accent);
}

.site-tools { display: flex; align-items: center; gap: 10px; }

.nav-search__input {
  width: 132px;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  transition: width var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.nav-search__input::placeholder { color: var(--faint); }
.nav-search__input:focus {
  width: 200px;
  outline: none;
  border-color: var(--border-strong);
  background: var(--surface);
}

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 34px; height: 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text-strong); }
.icon-btn svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.icon-btn .icon-moon { display: none; }
[data-theme="dark"] .icon-btn .icon-sun  { display: none; }
[data-theme="dark"] .icon-btn .icon-moon { display: block; fill: none; }
.icon-btn--wide { width: 100%; height: auto; padding: 8px 12px; font-size: 0.875rem; }

/* --------------------------------------------------------------------------
   5. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  color: var(--text);
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease),
              color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.btn--sm { padding: 6px 13px; font-size: 0.875rem; }
.btn--block { width: 100%; }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #FFFFFF; }
.btn--primary:hover { opacity: 0.88; color: #FFFFFF; }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--danger { color: var(--danger); border-color: var(--border); }
.btn--danger:hover { background: var(--danger-soft); border-color: var(--danger); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

/* --------------------------------------------------------------------------
   6. Hero / page heads
   -------------------------------------------------------------------------- */
.hero { padding: 88px 0 56px; border-bottom: 1px solid var(--border); }
.hero__title {
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.hero__subtitle { color: var(--muted); font-size: 1.0625rem; max-width: 34em; }

.page-head { padding: 64px 0 32px; }
.page-head--center { text-align: center; }
.page-head__title { font-size: clamp(1.75rem, 4vw, 2.25rem); margin-bottom: 10px; }
.page-head__desc { color: var(--muted); font-size: 1rem; }

.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; padding-bottom: 14px; margin-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.section-head__title { font-size: 1.0625rem; letter-spacing: 0.02em; }
.section-head__count { color: var(--muted); font-size: 0.875rem; }

.crumb {
  display: flex; gap: 8px; align-items: center;
  font-size: 0.8125rem; color: var(--muted);
  padding-top: 40px;
}
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--accent); }

/* --------------------------------------------------------------------------
   7. Post list + cards
   -------------------------------------------------------------------------- */
.post-list { border-top: 1px solid var(--border); }

.post-card {
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.post-card:hover { opacity: 0.92; }

.post-card__meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  font-size: 0.8125rem; color: var(--muted);
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}
.post-card__cat { color: var(--muted); }
.post-card__cat:hover { color: var(--accent); }
.dot { color: var(--faint); }

.post-card__title { font-size: 1.375rem; margin-bottom: 10px; }
.post-card__title a { color: var(--text-strong); }
.post-card__title a:hover { color: var(--accent); }

.post-card__excerpt {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.72;
  margin-bottom: 14px;
  max-width: 62ch;
}

/* Reveal-on-load: transform + opacity only, never a bounce. */
.reveal { opacity: 0; transform: translateY(6px); }
.reveal.is-revealed {
  opacity: 1; transform: none;
  transition: opacity 300ms var(--ease), transform 300ms var(--ease);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
  * { transition-duration: 1ms !important; }
}

/* --------------------------------------------------------------------------
   8. Tags
   -------------------------------------------------------------------------- */
.tag-row { display: flex; gap: 8px; list-style: none; margin: 0; padding: 0; font-size: 0.8125rem; }
.tag-row--wrap { flex-wrap: wrap; }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.tag:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.tag.is-active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.tag__count { color: var(--faint); font-size: 0.75rem; font-variant-numeric: tabular-nums; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; margin: 0; padding: 0; }
.tag-cloud__item {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: calc(0.875rem + (var(--weight, 1) - 1) * 0.02rem);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.tag-cloud__item:hover { border-color: var(--accent); color: var(--accent); }
.tag-cloud__count { color: var(--faint); font-size: 0.75rem; }

.category-grid {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  list-style: none; margin: 0; padding: 0;
  background: var(--border);
  border: 1px solid var(--border);
}
.category-card { background: var(--surface); }
.category-card a { display: flex; flex-direction: column; gap: 4px; padding: 22px; height: 100%; }
.category-card__name { color: var(--text-strong); font-family: var(--font-serif); font-weight: 700; font-size: 1.0625rem; }
.category-card__count { color: var(--muted); font-size: 0.8125rem; }
.category-card__desc { color: var(--muted); font-size: 0.875rem; line-height: 1.6; }
.category-card a:hover .category-card__name { color: var(--accent); }

.taxonomy-section { margin-bottom: 56px; }
.taxonomy-section .section-head__title { margin-bottom: 18px; }

/* --------------------------------------------------------------------------
   9. Home layout + aside
   -------------------------------------------------------------------------- */
.home-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 56px; padding-top: 56px; }
.home-aside { display: flex; flex-direction: column; gap: 36px; }

.aside-block__title {
  font-size: 0.8125rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 14px;
}
.aside-block__text { color: var(--muted); font-size: 0.875rem; line-height: 1.7; margin-bottom: 12px; }
.aside-block__more { display: inline-block; margin-top: 14px; font-size: 0.8125rem; color: var(--muted); }
.aside-block__more:hover { color: var(--accent); }

.aside-list { list-style: none; margin: 0; padding: 0; font-size: 0.9375rem; }
.aside-list li { border-bottom: 1px solid var(--border); }
.aside-list li:first-child { border-top: 1px solid var(--border); }
.aside-list a {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 10px 0; color: var(--text);
}
.aside-list a:hover { color: var(--accent); }
.aside-list a.is-active { color: var(--accent); font-weight: 500; }
.aside-list__count { color: var(--faint); font-size: 0.8125rem; font-variant-numeric: tabular-nums; }
.aside-list__empty { padding: 10px 0; color: var(--faint); font-size: 0.875rem; }

.filter-note { color: var(--muted); font-size: 0.875rem; padding: 14px 0 0; }
.link-quiet { color: var(--muted); border-bottom: 1px solid var(--border); transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.link-quiet:hover { color: var(--accent); border-color: var(--accent); }

/* --------------------------------------------------------------------------
   10. Post detail
   -------------------------------------------------------------------------- */
.reading-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px;
  z-index: 60; background: transparent; pointer-events: none;
}
.reading-progress__bar {
  height: 100%; width: 0;
  background: var(--accent);
  transition: width 120ms linear;
}

.post__header { padding-top: 8px; }
.post__header .crumb { padding-top: 40px; }
.post__title { font-size: clamp(1.875rem, 4.4vw, 2.6rem); margin: 20px 0 16px; letter-spacing: -0.018em; }
.post__lede { color: var(--muted); font-size: 1.0625rem; line-height: 1.7; max-width: 44em; margin-bottom: 24px; }

.post__meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 18px 0 24px;
  border-bottom: 1px solid var(--border);
  font-size: 0.8125rem; color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.post__cover { margin: 40px auto 0; }
.post__cover img { width: 100%; border: 1px solid var(--border); border-radius: var(--radius); }

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 48px;
  padding-top: 44px;
}
.post-layout--no-toc { max-width: var(--shell); }

.post-toc { display: none; }
.post-toc__inner { position: sticky; top: 96px; }
.post-toc__title {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 12px;
}
.post-toc__list { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.post-toc__item a {
  display: block; padding: 5px 0 5px 14px;
  font-size: 0.8125rem; line-height: 1.5; color: var(--muted);
  border-left: 1px solid transparent; margin-left: -1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.post-toc__item a:hover { color: var(--text-strong); }
.post-toc__item a.is-active { color: var(--accent); border-left-color: var(--accent); }
.post-toc__item--h3 a { padding-left: 26px; font-size: 0.78125rem; }
.post-toc__item--h4 a { padding-left: 38px; font-size: 0.75rem; }

.post__footer { padding-top: 48px; margin-top: 48px; border-top: 1px solid var(--border); }

.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 32px; }
.post-nav__item {
  display: flex; flex-direction: column; gap: 6px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--dur) var(--ease);
}
.post-nav__item:hover { border-color: var(--accent); }
.post-nav__item.is-empty { border-color: transparent; background: transparent; }
.post-nav__item--next { text-align: right; }
.post-nav__label { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.04em; }
.post-nav__title { color: var(--text-strong); font-family: var(--font-serif); font-weight: 700; font-size: 0.9375rem; line-height: 1.5; }
.post-nav__item:hover .post-nav__title { color: var(--accent); }

.related { padding-top: 72px; }
.related .section-head__title { display: block; padding-bottom: 16px; border-bottom: 1px solid var(--border); margin-bottom: 0; }

/* --------------------------------------------------------------------------
   11. Prose (rendered Markdown) — the heart of the site
   -------------------------------------------------------------------------- */
.prose {
  font-family: var(--font-serif);
  font-size: 1.0625rem;     /* 17px */
  line-height: var(--leading);
  color: var(--text);
  letter-spacing: 0.006em;
  overflow-wrap: break-word;
}
.prose > * + * { margin-top: 1.5em; }
.prose > :first-child { margin-top: 0; }

.prose h2, .prose h3, .prose h4 {
  font-family: var(--font-serif);
  margin-top: 2.4em;
  margin-bottom: 0.7em;
  scroll-margin-top: 92px;
}
.prose h2 { font-size: 1.5rem; padding-bottom: 0.4em; border-bottom: 1px solid var(--border); }
.prose h3 { font-size: 1.1875rem; }
.prose h4 { font-size: 1.0625rem; }

.prose p { margin: 0; }
.prose strong { font-weight: 700; color: var(--text-strong); }
.prose em { font-style: italic; }

.prose a { border-bottom: 1px solid var(--border); transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease); }
.prose a:hover { border-color: var(--accent); color: var(--accent); }

.prose ul, .prose ol { padding-left: 1.4em; margin: 0; }
.prose li + li { margin-top: 0.5em; }
.prose li::marker { color: var(--faint); }

.prose blockquote {
  margin: 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--border-strong);
  color: var(--muted);
  font-style: normal;
}
.prose blockquote p + p { margin-top: 1em; }

.prose img { border: 1px solid var(--border); border-radius: var(--radius); margin: 2em auto; }

.prose hr { margin: 3em 0; }

/* Inline code */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--surface-sunk);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-strong);
}

/* Fenced code blocks (Pygments wraps output in .codehilite) */
.prose pre,
.prose .codehilite {
  margin: 0;
  padding: 20px 22px;
  background: var(--surface-sunk);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
  -webkit-overflow-scrolling: touch;
}
.prose .codehilite pre { padding: 0; border: 0; background: none; }
.prose pre code {
  padding: 0; background: none; border: 0; font-size: inherit;
  color: var(--text); white-space: pre;
}

/* Tables: hairline grid, no zebra striping (keeps the print feel) */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  border: 1px solid var(--border);
}
.prose thead th {
  text-align: left;
  font-weight: 700;
  color: var(--text-strong);
  background: var(--surface-sunk);
  border-bottom: 1px solid var(--border);
}
.prose th, .prose td { padding: 11px 14px; border-bottom: 1px solid var(--border); }
.prose tbody tr:last-child td { border-bottom: 0; }

.prose figure { margin: 2em 0; }
.prose figcaption { margin-top: 10px; font-size: 0.875rem; color: var(--muted); text-align: center; font-family: var(--font-sans); }

.prose--about > * + * { margin-top: 1.6em; }
.prose--about h2 { border-bottom: 0; padding-bottom: 0; }

/* Syntax highlighting: a desaturated grey palette with the accent carrying
   keywords.  Deliberately low-chroma so code never fights the prose. */
.codehilite .c, .codehilite .c1, .codehilite .cm, .codehilite .cs { color: var(--faint); font-style: italic; }
.codehilite .k, .codehilite .kd, .codehilite .kn, .codehilite .kr, .codehilite .kt { color: var(--accent); font-weight: 500; }
.codehilite .s, .codehilite .s1, .codehilite .s2, .codehilite .sb, .codehilite .sc, .codehilite .sd { color: #5F6E5A; }
.codehilite .m, .codehilite .mi, .codehilite .mf, .codehilite .mh, .codehilite .il { color: #7A6A5F; }
.codehilite .n, .codehilite .na, .codehilite .nb, .codehilite .nc, .codehilite .nf { color: var(--text-strong); }
.codehilite .o, .codehilite .ow, .codehilite .p { color: var(--muted); }
.codehilite .err { color: var(--danger); }
[data-theme="dark"] .codehilite .s, [data-theme="dark"] .codehilite .s1,
[data-theme="dark"] .codehilite .s2 { color: #9BAF94; }
[data-theme="dark"] .codehilite .m, [data-theme="dark"] .codehilite .mi { color: #C0AC9C; }

/* --------------------------------------------------------------------------
   12. Pagination, empty states, search, auth, error
   -------------------------------------------------------------------------- */
.pagination {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 34px 0;
  font-size: 0.875rem;
}
.pagination__link { color: var(--muted); transition: color var(--dur) var(--ease); }
.pagination__link:hover { color: var(--accent); }
.pagination__link.is-disabled { color: var(--faint); opacity: 0.55; }
.pagination__status { color: var(--muted); font-variant-numeric: tabular-nums; }

.empty-state {
  padding: 72px 24px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  margin: 32px 0;
}
.empty-state__mark {
  width: 34px; height: 34px; margin: 0 auto 18px;
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  background:
    linear-gradient(var(--border-strong), var(--border-strong)) 8px 12px / 18px 1px no-repeat,
    linear-gradient(var(--border), var(--border)) 8px 18px / 12px 1px no-repeat;
}
.empty-state__title { color: var(--text-strong); font-family: var(--font-serif); font-weight: 700; margin-bottom: 8px; }
.empty-state__hint { color: var(--muted); font-size: 0.9375rem; margin-bottom: 18px; }

.search-form { display: flex; gap: 10px; padding: 8px 0 26px; }
.search-form__input {
  flex: 1; padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease);
}
.search-form__input:focus { outline: none; border-color: var(--accent); }

.search-status { color: var(--muted); font-size: 0.875rem; padding-bottom: 18px; min-height: 1.2em; }

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 26px;
}
.card__title {
  font-size: 1rem; margin-bottom: 18px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.form { display: flex; flex-direction: column; gap: 18px; }
.auth-shell { padding-top: 24px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field__label { font-size: 0.8125rem; color: var(--muted); letter-spacing: 0.02em; }
.field__input {
  width: 100%; padding: 10px 13px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.field__input:focus { outline: none; border-color: var(--accent); background: var(--surface); }
.field__input--sm { padding: 7px 11px; font-size: 0.875rem; }
.field__input--mono { font-family: var(--font-mono); font-size: 0.875rem; line-height: 1.65; }
.field__hint { font-size: 0.8125rem; color: var(--faint); }
.form__hint { text-align: center; font-size: 0.875rem; color: var(--muted); }
.form__error {
  padding: 11px 14px; font-size: 0.875rem;
  color: var(--danger); background: var(--danger-soft);
  border: 1px solid var(--danger); border-radius: var(--radius);
}

.error-shell { padding: 96px 24px; text-align: center; }
.error-shell__code { font-family: var(--font-serif); font-size: 3.5rem; font-weight: 700; color: var(--border-strong); line-height: 1; }
.error-shell__title { font-size: 1.5rem; margin: 14px 0 10px; }
.error-shell__message { color: var(--muted); margin-bottom: 26px; }
.error-shell__actions { display: flex; gap: 12px; justify-content: center; }

/* --------------------------------------------------------------------------
   13. Archive
   -------------------------------------------------------------------------- */
.archive { border-top: 1px solid var(--border); padding-top: 8px; }
.archive-year { padding: 34px 0 12px; }
.archive-year__label {
  display: flex; align-items: baseline; gap: 14px;
  padding-bottom: 14px; border-bottom: 1px solid var(--border);
}
.archive-year__number { font-size: 1.75rem; letter-spacing: 0.04em; font-variant-numeric: tabular-nums; }
.archive-year__count { color: var(--muted); font-size: 0.8125rem; font-weight: 400; }

.archive-month { padding: 22px 0 4px 0; }
.archive-month__label {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 10px; font-family: var(--font-sans);
}
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px; align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
}
.archive-item__date { color: var(--faint); font-size: 0.8125rem; font-variant-numeric: tabular-nums; }
.archive-item__title { color: var(--text); font-size: 0.9375rem; }
.archive-item__title:hover { color: var(--accent); }
.archive-item__meta { color: var(--faint); font-size: 0.75rem; white-space: nowrap; }

/* --------------------------------------------------------------------------
   14. Footer
   -------------------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.site-footer__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap; padding-top: 30px; padding-bottom: 30px;
}
.site-footer__text { color: var(--muted); font-size: 0.8125rem; }
.site-footer__note { color: var(--muted); font-size: 0.75rem; margin-top: 4px; }
.site-footer__note a { color: var(--muted); }
.site-footer__note a:hover { color: var(--accent); }
.site-footer__links { display: flex; gap: 18px; font-size: 0.8125rem; }
.site-footer__links a { color: var(--muted); }
.site-footer__links a:hover { color: var(--accent); }

/* --------------------------------------------------------------------------
   15. Admin
   -------------------------------------------------------------------------- */
.admin-body { background: var(--bg); }
.admin { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; }

.admin-side {
  display: flex; flex-direction: column; gap: 28px;
  padding: 26px 20px;
  border-right: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0; height: 100vh;
}
.admin-brand { display: flex; flex-direction: column; gap: 2px; }
.admin-brand__name { font-family: var(--font-serif); font-weight: 700; color: var(--text-strong); font-size: 1.0625rem; }
.admin-brand__sub { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.08em; }

.admin-nav { display: flex; flex-direction: column; gap: 2px; }
.admin-nav__link {
  padding: 8px 12px; border-radius: var(--radius);
  color: var(--muted); font-size: 0.9375rem;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.admin-nav__link:hover { color: var(--text-strong); background: var(--accent-soft); }
.admin-nav__link.is-active { color: var(--accent); background: var(--accent-soft); font-weight: 500; }

.admin-side__foot { margin-top: auto; display: flex; flex-direction: column; gap: 12px; }
.admin-user { display: flex; flex-direction: column; gap: 2px; padding-top: 16px; border-top: 1px solid var(--border); }
.admin-user__name { color: var(--text-strong); font-size: 0.9375rem; }
.admin-user__role { color: var(--muted); font-size: 0.75rem; }
.admin-side__actions { display: flex; gap: 8px; }
.admin-side__actions .btn { flex: 1; }

.admin-main { min-width: 0; }
.admin-head {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 26px 34px;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  z-index: 20;
}
.admin-head__title { font-size: 1.25rem; }
.admin-head__actions { display: flex; align-items: center; gap: 10px; }
.admin-content { padding: 30px 34px 80px; display: flex; flex-direction: column; gap: 26px; }
.admin-note { color: var(--muted); font-size: 0.875rem; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.stat { display: flex; flex-direction: column; gap: 6px; padding: 20px 22px; background: var(--surface); }
.stat__label { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
.stat__value { font-family: var(--font-serif); font-weight: 700; font-size: 1.625rem; color: var(--text-strong); font-variant-numeric: tabular-nums; }
.stat__hint { font-size: 0.75rem; color: var(--faint); }

.admin-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 22px; }

.sparkline { display: flex; align-items: flex-end; gap: 5px; height: 128px; padding-top: 10px; }
.sparkline__col { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; gap: 6px; }
.sparkline__bar { width: 100%; min-height: 2px; background: var(--accent); opacity: 0.75; border-radius: 1px; transition: opacity var(--dur) var(--ease); }
.sparkline__col:hover .sparkline__bar { opacity: 1; }
.sparkline__label { font-size: 0.6875rem; color: var(--faint); font-variant-numeric: tabular-nums; }

.table-wrap { border: 1px solid var(--border); border-radius: var(--radius); overflow-x: auto; background: var(--surface); }
.table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.table th {
  text-align: left; font-weight: 500; font-size: 0.75rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--muted);
  padding: 13px 16px; border-bottom: 1px solid var(--border); white-space: nowrap;
}
.table td { padding: 13px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tbody tr:last-child td { border-bottom: 0; }
.table tbody tr { transition: background-color var(--dur) var(--ease); }
.table tbody tr:hover { background: var(--surface-sunk); }
.table--compact td, .table--compact th { padding: 9px 12px; }
.table__num { text-align: right; font-variant-numeric: tabular-nums; }
.table__muted { color: var(--muted); font-size: 0.875rem; white-space: nowrap; }
.table__title { color: var(--text-strong); }
.table__slug { display: block; color: var(--faint); font-size: 0.75rem; font-family: var(--font-mono); margin-top: 2px; }
.table__empty { text-align: center; color: var(--muted); padding: 34px 16px; }
.table__check { width: 40px; }
.table__actions { text-align: right; white-space: nowrap; }
.table__actions .link-quiet { margin-left: 12px; font-size: 0.8125rem; }
.table tr.is-deleted { opacity: 0.55; }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: var(--radius);
  font-size: 0.6875rem; letter-spacing: 0.04em;
  border: 1px solid var(--border); color: var(--muted); background: var(--surface-sunk);
  vertical-align: middle;
}
.badge--published { color: #4A6B52; border-color: #B9CDBE; background: #EDF3EE; }
.badge--draft { color: var(--muted); }
.badge--scheduled { color: var(--accent); border-color: var(--border-strong); }
.badge--deleted { color: var(--danger); border-color: #D8B9B9; background: var(--danger-soft); }
.badge--featured { color: var(--accent); border-color: var(--accent); }
.badge--role-admin { color: var(--accent); border-color: var(--accent); }
[data-theme="dark"] .badge--published { color: #9EC2A8; border-color: #3B4A3F; background: #212A23; }

.keyvalue { display: flex; flex-direction: column; gap: 0; margin: 0; }
.keyvalue > div { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.keyvalue > div:last-child { border-bottom: 0; }
.keyvalue dt { color: var(--muted); font-size: 0.875rem; }
.keyvalue dd { margin: 0; color: var(--text-strong); font-size: 0.875rem; font-variant-numeric: tabular-nums; }

.filter-bar, .bulk-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 14px 16px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.filter-bar__group { display: flex; align-items: center; gap: 8px; }
.filter-bar__group--grow { flex: 1; min-width: 160px; }
.filter-bar__group--grow .field__input { width: 100%; }

.bulk-form { display: flex; flex-direction: column; gap: 14px; }
.bulk-bar { justify-content: space-between; }
.bulk-bar__count { color: var(--muted); font-size: 0.875rem; }
.bulk-bar__actions { display: flex; gap: 8px; flex-wrap: wrap; }

.list-foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.list-foot__meta { color: var(--muted); font-size: 0.875rem; }

.inline-form { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.settings-form { display: flex; flex-direction: column; gap: 30px; }
.settings-group { display: flex; flex-direction: column; gap: 16px; }

.autosave-indicator { font-size: 0.8125rem; color: var(--muted); transition: color var(--dur) var(--ease); }
.autosave-indicator.is-saved { color: var(--accent); }
.autosave-indicator.is-saving { color: var(--faint); }

/* Media library */
.media-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 18px; }
.media-grid__empty { grid-column: 1 / -1; }
.media-item { margin: 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.media-item__thumb { display: block; width: 100%; aspect-ratio: 16 / 10; background: var(--surface-sunk); cursor: copy; }
.media-item__thumb img { width: 100%; height: 100%; object-fit: cover; }
.media-item__meta { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border-top: 1px solid var(--border); }
.media-item__name { font-size: 0.8125rem; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.media-item__size { font-size: 0.6875rem; color: var(--faint); }

.revisions { margin-top: 26px; }
.revision-list { list-style: none; margin: 0; padding: 0; }
.revision { display: flex; align-items: center; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
.revision:last-child { border-bottom: 0; }
.revision__time { color: var(--muted); min-width: 84px; }
.revision__note { color: var(--text); flex: 1; }
.revision__size { color: var(--faint); font-size: 0.75rem; }

/* --------------------------------------------------------------------------
   16. Editor
   -------------------------------------------------------------------------- */
.editor { display: flex; flex-direction: column; gap: 18px; }
.editor__meta { display: flex; flex-direction: column; gap: 16px; padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.editor__title {
  width: 100%; padding: 10px 0;
  border: 0; border-bottom: 1px solid var(--border);
  background: transparent;
  font-family: var(--font-serif); font-weight: 700; font-size: 1.625rem; color: var(--text-strong);
  letter-spacing: -0.01em;
  transition: border-color var(--dur) var(--ease);
}
.editor__title:focus { outline: none; border-color: var(--accent); }
.editor__title::placeholder { color: var(--faint); }

.editor__fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.field--inline { gap: 5px; }
.editor__excerpt { display: flex; flex-direction: column; gap: 6px; }

.editor__toolbar {
  display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
  padding: 8px 10px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.tool {
  padding: 6px 11px; border-radius: 3px;
  font-size: 0.8125rem; color: var(--muted);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  cursor: pointer;
}
.tool:hover { background: var(--accent-soft); color: var(--accent); }
.tool--file { cursor: pointer; }
.tool-sep { width: 1px; height: 18px; background: var(--border); margin: 0 4px; }

.editor__panes { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; min-height: 60vh; }
.editor__pane { display: flex; flex-direction: column; background: var(--bg); min-width: 0; }
.editor__pane-head {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 14px; border-bottom: 1px solid var(--border);
  font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
  background: var(--surface);
}
.editor__stats { text-transform: none; letter-spacing: 0; font-size: 0.75rem; color: var(--faint); }
.editor__textarea {
  flex: 1; width: 100%; min-height: 56vh; padding: 20px;
  border: 0; background: transparent; resize: vertical;
  font-family: var(--font-mono); font-size: 0.9375rem; line-height: 1.8;
  color: var(--text);
}
.editor__textarea:focus { outline: none; }
.editor__preview { flex: 1; padding: 20px 22px; overflow-y: auto; max-height: 74vh; }
.editor__placeholder { color: var(--faint); font-family: var(--font-sans); font-size: 0.9375rem; }
.editor__panes.is-preview-only .editor__pane--write { display: none; }
.editor__panes.is-preview-only { grid-template-columns: 1fr; }
.editor__panes.is-write-only .editor__pane--preview { display: none; }
.editor__panes.is-write-only { grid-template-columns: 1fr; }

.editor__drop { outline: 2px dashed var(--accent); outline-offset: -6px; }

/* --------------------------------------------------------------------------
   17. Toasts
   -------------------------------------------------------------------------- */
.toast-stack {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  display: flex; flex-direction: column; gap: 10px; align-items: flex-end;
  pointer-events: none;
}
.toast {
  padding: 11px 16px;
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  font-size: 0.875rem; max-width: 340px;
  opacity: 0; transform: translateY(8px);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
}
.toast.is-visible { opacity: 1; transform: none; }
.toast--ok { border-color: var(--accent); }
.toast--error { border-color: var(--danger); color: var(--danger); }

/* --------------------------------------------------------------------------
   18. Responsive
   -------------------------------------------------------------------------- */
@media (min-width: 1100px) {
  /* The TOC sidebar only appears when there is genuinely room for it. */
  .post-layout { grid-template-columns: minmax(0, 1fr) 210px; }
  .post-layout--no-toc { grid-template-columns: minmax(0, 1fr); }
  .post-toc { display: block; }
}

@media (max-width: 980px) {
  .home-layout { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .home-aside { flex-direction: row; flex-wrap: wrap; gap: 32px; }
  .home-aside > * { flex: 1 1 220px; }
  .editor__panes { grid-template-columns: 1fr; }
  .admin { grid-template-columns: 1fr; }
  .admin-side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .admin-nav { flex-direction: row; flex-wrap: wrap; }
  .admin-side__foot { flex-direction: row; align-items: center; justify-content: space-between; flex-wrap: wrap; }
  .admin-user { border-top: 0; padding-top: 0; }
  .icon-btn--wide { width: auto; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .shell { padding: 0 18px; }
  .site-header__inner { flex-wrap: wrap; gap: 12px; padding-top: 10px; padding-bottom: 10px; min-height: 0; }
  .brand { width: 100%; }
  .site-nav { margin-left: 0; order: 3; width: 100%; overflow-x: auto; }
  .site-tools { margin-left: auto; }
  .nav-search__input { width: 104px; }
  .nav-search__input:focus { width: 150px; }
  .hero { padding: 56px 0 40px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav__item--next { text-align: left; }
  .archive-item { grid-template-columns: 28px minmax(0, 1fr); }
  .archive-item__meta { display: none; }
  .admin-head, .admin-content { padding-left: 18px; padding-right: 18px; }
  .post__title { font-size: 1.75rem; }
  .prose { font-size: 1rem; }
  .prose pre { font-size: 0.8125rem; padding: 16px; }
}

@media print {
  .site-header, .site-footer, .post-toc, .reading-progress, .post-nav, .related { display: none; }
  body { background: #FFFFFF; color: #000000; }
  .prose { font-size: 11pt; }
}