/* enhancements.css — add-ons that improve the polish layer */

/* Theme toggle (lives in masthead) */
.theme-toggle {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--c-paper-edge);
  background: var(--c-paper);
  color: var(--c-ink-soft);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-standard),
              color var(--dur-fast) var(--ease-standard),
              transform var(--dur-base) var(--ease-emph);
}
.theme-toggle:hover {
  color: var(--c-brand);
  border-color: var(--c-brand);
  transform: rotate(-15deg);
}

/* ── Command palette (Cmd-K) ── */
.cmdk { display: none; }
.cmdk.is-open { display: block; }
.cmdk__backdrop {
  position: fixed; inset: 0;
  background: rgba(26, 31, 29, 0.36);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 60;
  animation: cmdk-fade var(--dur-base) var(--ease-emph);
}
.cmdk__panel {
  position: fixed;
  top: 12vh; left: 50%; transform: translateX(-50%);
  width: min(640px, calc(100% - 2rem));
  background: var(--c-paper);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--r-md);
  box-shadow: 0 24px 48px -16px rgba(26, 31, 29, 0.32);
  z-index: 61;
  overflow: hidden;
  animation: cmdk-pop var(--dur-base) var(--ease-emph);
}
@keyframes cmdk-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes cmdk-pop { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

.cmdk__head {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-4);
  border-bottom: 1px solid var(--c-paper-edge);
  font-size: 1.1rem;
}
.cmdk__head span[aria-hidden] {
  color: var(--c-ink-mute);
  font-size: 1.3rem;
}
.cmdk__input {
  flex: 1;
  border: 0 !important;
  outline: none;
  background: transparent;
  font-size: 1.05rem;
  font-family: var(--ff-sans);
  padding: 0;
  box-shadow: none !important;
}
.cmdk__input:focus { box-shadow: none !important; }
.cmdk__hint {
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-caps);
  color: var(--c-ink-mute);
  border: 1px solid var(--c-paper-edge);
  padding: 0.1em 0.5em;
  border-radius: var(--r-sm);
}

.cmdk__results {
  list-style: none; padding: 0; margin: 0;
  max-height: 50vh; overflow-y: auto;
}
.cmdk__results li {
  border-bottom: 1px solid var(--c-paper-edge);
}
.cmdk__results li:last-child { border-bottom: 0; }
.cmdk__results li a {
  display: flex; flex-direction: column;
  padding: var(--sp-3) var(--sp-4);
  text-decoration: none;
  color: var(--c-ink);
  gap: 0.2em;
}
.cmdk__results li.is-cursor { background: var(--c-brand-glow); }
.cmdk__results li.is-cursor strong { color: var(--c-brand); }
.cmdk__path {
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  color: var(--c-ink-mute);
}
.cmdk__empty {
  padding: var(--sp-5);
  text-align: center;
  color: var(--c-ink-mute);
}
.cmdk__foot {
  display: flex; gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-top: 1px solid var(--c-paper-edge);
  font-size: var(--fs-xs);
  color: var(--c-ink-mute);
  letter-spacing: var(--tracking-caps);
}

/* ── Empty state illustration ── */
.empty-illu {
  display: block;
  margin: 0 auto var(--sp-4);
  max-width: 180px;
  opacity: 0.7;
}
.empty-illu path,
.empty-illu circle,
.empty-illu line {
  fill: none;
  stroke: var(--c-line-strong);
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.empty-illu .accent {
  stroke: var(--c-brand);
}

/* ── i18n typography: 中英混排间距 ── */
.prose :lang(en),
.muted :lang(en) {
  margin-inline: 0.05em;
}
.prose, .card__body, .lede {
  word-break: break-word;
}
/* CJK quote marks 跟正文紧挨 */
.prose blockquote { quotes: "「" "」" "『" "』"; }

/* Backlinks panel: shown at the bottom of every document */
.backlinks {
  margin-top: var(--sp-7);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--c-paper-edge);
}
.backlinks__list {
  list-style: none;
  padding: 0;
  margin: var(--sp-3) 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-3);
}
.backlinks__list li {
  background: var(--c-paper-soft);
  border-radius: var(--r-md);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.backlinks__list li:hover { border-color: var(--c-line-strong); }
.backlinks__list a { text-decoration: none; }

/* Reading progress bar — barely-there, fixed top */
.reading-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--c-brand), var(--c-accent));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 50;
  pointer-events: none;
}

/* Copy button on code blocks */
.prose pre { position: relative; }
.prose pre .copy-btn {
  position: absolute;
  top: 0.6em; right: 0.7em;
  font-family: var(--ff-sans);
  font-size: 0.72rem;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  background: var(--c-paper);
  color: var(--c-ink-soft);
  border: 1px solid var(--c-paper-edge);
  padding: 0.25em 0.7em;
  border-radius: var(--r-sm);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-standard);
  cursor: pointer;
}
.prose pre:hover .copy-btn,
.prose pre .copy-btn:focus { opacity: 1; }
.prose pre .copy-btn:hover { color: var(--c-brand); border-color: var(--c-brand); }

/* Tree hit highlighting */
mark.tree__hit {
  background: rgba(180, 138, 58, 0.22);
  color: var(--c-ink);
  padding: 0 0.1em;
  border-radius: 2px;
}

/* Keyboard kbd */
.prose kbd {
  font-family: var(--ff-mono);
  font-size: 0.85em;
  padding: 0.05em 0.45em;
  border: 1px solid var(--c-line);
  border-radius: 4px;
  background: var(--c-paper-soft);
  box-shadow: 0 1px 0 var(--c-line);
  color: var(--c-ink-soft);
}

/* ── Review page (GitHub-style side-by-side diff) ───────────────── */
.review-back { margin-bottom: var(--sp-4); }
.link-quiet { color: var(--c-ink-mute); text-decoration: none; font-size: 0.85rem; }
.link-quiet:hover { color: var(--c-brand); }

.review-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-5);
  flex-wrap: wrap;
}
.review-head__main { min-width: 0; flex: 1; }
.review-title { margin: 0.2em 0 0.3em; }
.review-meta { display: flex; flex-wrap: wrap; gap: 0.4em; align-items: center; font-size: 0.82rem; }
.review-meta .sep { opacity: 0.5; }
.review-meta code { font-size: 0.8rem; }
.review-actions--top { display: flex; gap: var(--sp-2); flex-shrink: 0; }

.review-statbar {
  display: flex;
  gap: var(--sp-4);
  align-items: center;
  margin: var(--sp-4) 0 var(--sp-3);
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  flex-wrap: wrap;
}
.review-stat { color: var(--c-ink-mute); }
.review-stat--add { color: #2da44e; font-weight: 600; }
.review-stat--del { color: #cf222e; font-weight: 600; }
.review-stat--chg { color: #9a6700; font-weight: 600; }

.review-note {
  margin: 0 0 var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--c-brand);
  background: var(--c-paper-soft);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.review-note__label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--c-ink-mute);
  margin-bottom: 0.3em;
}
.review-note p { margin: 0; }

/* Diff container: full width, no wasted space */
.review-diff {
  margin: 0 0 var(--sp-5);
  overflow-x: auto;
  border: 1px solid var(--c-paper-edge);
  border-radius: var(--r-md);
  background: var(--c-paper);
}
.ld-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  line-height: 1.55;
  table-layout: fixed;
}
.ld-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 0.45rem 0.8rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.74rem;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  background: var(--c-paper-soft);
  border-bottom: 1px solid var(--c-paper-edge);
}
.ld-side--old { color: #cf222e; }
.ld-side--new { color: #2da44e; border-left: 1px solid var(--c-paper-edge); }

/* line-number gutter + code cell, two columns each side */
.ld-num {
  width: 1%;
  min-width: 3em;
  padding: 0 0.6em;
  text-align: right;
  color: var(--c-ink-faint);
  background: var(--c-paper-soft);
  user-select: none;
  vertical-align: top;
  border-right: 1px solid var(--c-paper-edge);
  white-space: nowrap;
}
.ld-code + .ld-num { border-left: 2px solid var(--c-paper-edge); }
.ld-code {
  width: 49%;
  padding: 0 0.7em 0 1.6em;
  white-space: pre-wrap;
  word-break: break-word;
  vertical-align: top;
  color: var(--c-ink);
  position: relative;
}
/* GitHub-style +/− markers in the gutter of each code cell */
.ld-add::before,
.ld-del::before {
  position: absolute;
  left: 0.5em;
  font-weight: 700;
  opacity: 0.7;
}
.ld-add::before { content: "+"; color: #1a7f37; }
.ld-del::before { content: "\2212"; color: #cf222e; }

.ld-ctx { color: var(--c-ink-soft); }
.ld-del {
  background: rgba(207, 34, 46, 0.16);
  color: #82151d;
}
.ld-add {
  background: rgba(45, 164, 78, 0.18);
  color: #0a5128;
}
.ld-empty {
  background: repeating-linear-gradient(
    45deg, var(--c-paper-soft), var(--c-paper-soft) 6px,
    rgba(0,0,0,0.025) 6px, rgba(0,0,0,0.025) 12px);
}
/* line-number gutter tint for changed rows */
tr:has(.ld-del) > .ld-num { background: rgba(207, 34, 46, 0.12); color: #82151d; }
tr:has(.ld-add) > .ld-num { background: rgba(45, 164, 78, 0.14); color: #0a5128; }
.ld-gap, .ld-skip .ld-code {
  text-align: center;
  color: var(--c-ink-faint);
  background: var(--c-paper-soft);
  font-style: italic;
  padding: 0.3rem;
}

/* collapsible draft preview — hidden by default, no empty boxes */
.review-extra {
  border: 1px solid var(--c-paper-edge);
  border-radius: var(--r-md);
  margin-bottom: var(--sp-5);
}
.review-extra > summary {
  cursor: pointer;
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.85rem;
  color: var(--c-ink-soft);
  user-select: none;
}
.review-extra > summary:hover { color: var(--c-brand); }
.review-extra__prose { padding: var(--sp-4); border-top: 1px solid var(--c-paper-edge); }
.review-err { padding: var(--sp-4); color: var(--c-danger, #b04030); }

.review-doclink { margin-bottom: var(--sp-5); }
.review-decide { margin-top: var(--sp-4); }
.review-decide__btns { display: flex; gap: var(--sp-3); margin-top: var(--sp-3); }
.review-verdict { margin-top: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); }
.review-verdict__note { margin: 0; color: var(--c-ink-soft); }

/* On narrow screens, stack the two sides */
@media (max-width: 720px) {
  .ld-table, .ld-table tbody, .ld-table tr { display: block; }
  .ld-table thead { display: none; }
  .ld-table td { display: inline-block; }
  .ld-code { width: calc(100% - 4em); }
}


/* Statistics page */
.statistics-page {
  display: flex;
  flex-direction: column;
  gap: var(--sp-7);
}
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--sp-4);
}
.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-4);
  border: 1px solid var(--c-paper-edge);
  border-radius: var(--r-md);
  background: var(--c-paper);
}
.stat-card--highlight {
  border-color: var(--c-brand);
  background: var(--c-brand-glow);
}
.stat-number,
.stat-donut-total {
  font-family: var(--ff-serif);
  font-size: clamp(1.7rem, 3vw, 2.45rem);
  line-height: 1;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}
.stat-label,
.stat-donut-caption {
  color: var(--c-ink-soft);
  font-size: var(--fs-small);
}
.stat-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: var(--sp-5);
  align-items: stretch;
}
@media (max-width: 900px) {
  .stat-grid { grid-template-columns: 1fr; }
}
.stat-donut-shell {
  width: min(320px, 100%);
  margin: var(--sp-4) auto;
}
.stat-donut {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px var(--c-paper-edge);
}
.stat-donut-hole {
  position: absolute;
  inset: 23%;
  border-radius: 50%;
  background: var(--c-paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 0 0 1px var(--c-paper-edge);
}
.stat-legend {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.stat-legend-item {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  padding: var(--sp-3);
  border: 1px solid var(--c-paper-edge);
  border-radius: var(--r-md);
  background: var(--c-paper-soft);
}
.stat-swatch {
  flex: 0 0 auto;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  margin-top: 0.25rem;
}
.stat-legend-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
}
.stat-legend-head {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  font-variant-numeric: tabular-nums;
}

/* Anchor on heading hover */
.prose h2, .prose h3, .prose h4 { position: relative; }
.prose h2[id]:hover::before,
.prose h3[id]:hover::before,
.prose h4[id]:hover::before {
  content: "§";
  position: absolute;
  left: -1.4em; top: 0.2em;
  color: var(--c-ink-faint);
  font-size: 0.85em;
}

/* Project detail page */
.project-summary {
  max-width: 68rem;
  margin: var(--sp-3) 0 0;
  color: var(--c-ink-soft);
  font-size: 1.05rem;
  line-height: 1.75;
}
.project-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  gap: var(--sp-6);
  align-items: start;
  margin-top: var(--sp-5);
}
.project-prose {
  max-width: none;
  min-width: 0;
}
.project-prose > blockquote:first-child {
  margin-top: 0;
}
.project-aside {
  display: grid;
  gap: var(--sp-4);
  position: sticky;
  top: var(--sp-4);
}
.project-aside .card__title code {
  white-space: normal;
  overflow-wrap: anywhere;
}
@media (max-width: 900px) {
  .project-layout {
    grid-template-columns: 1fr;
  }
  .project-aside {
    position: static;
  }
}

/* Hero background — subtle radial accents (never look like a stock template) */
.section--hero {
  position: relative;
  isolation: isolate;
}
.section--hero::before {
  content: "";
  position: absolute;
  inset: -10% -5% auto auto;
  width: 320px; height: 320px;
  z-index: -1;
  background: radial-gradient(circle at 30% 30%,
    rgba(46, 79, 61, 0.08), transparent 65%);
  filter: blur(20px);
  pointer-events: none;
}
.section--hero::after {
  content: "";
  position: absolute;
  inset: auto auto -20% -10%;
  width: 280px; height: 280px;
  z-index: -1;
  background: radial-gradient(circle at 50% 50%,
    rgba(181, 58, 44, 0.06), transparent 65%);
  filter: blur(16px);
  pointer-events: none;
}

/* Marker decoration on entry-card hover */
@keyframes mark-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* ── Editorial refinements ─────────────────────────────────────────── */
/* ② serif-italic connective words inside the stacked hero title */
.hero__ital {
  font-family: var(--ff-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--c-ink-mute);
  letter-spacing: 0;
  padding-inline: 0.03em;
}

/* ⑤ modality cards lift gently on hover (keeping the existing left accent bar);
   trailing arrow glyphs nudge forward on any button. */
.entry-card {
  transition:
    transform var(--dur-base) var(--ease-out),
    border-color var(--dur-fast) var(--ease-standard),
    box-shadow var(--dur-base) var(--ease-out);
}
.entry-card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px -18px rgba(15, 23, 42, 0.5); }
.btn > span[aria-hidden] { transition: transform var(--dur-base) var(--ease-out); }
.btn:hover > span[aria-hidden] { transform: translateX(3px); }

/* ── Responsive: rendered Markdown tables scroll on their own instead of
   forcing the whole page to scroll sideways on mobile. ── */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.prose table { display: block; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* Scrollbar polish (WebKit) */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb {
  background: var(--c-line);
  border-radius: 999px;
  border: 2px solid var(--c-paper);
}
*::-webkit-scrollbar-thumb:hover { background: var(--c-line-strong); }
*::-webkit-scrollbar-track { background: transparent; }