/* Hallmark-inspired · macrostructure: Index-First · theme: Plain
 * accent: deep ink-blue < 5% of viewport · enrichment: none (typography only)
 * fonts: Inter Tight display + Inter body + JetBrains Mono labels (self-hosted)
 */
:root {
  --paper: #f7f6f3;
  --paper-2: #efeee9;
  --rule: #e5e4df;
  --ink: #17191d;
  --ink-body: #2a2d33;
  --ink-soft: #565d68;
  --ink-muted: #686c76;
  --accent: #2f56c8;
  --accent-soft: rgba(47, 86, 200, 0.07);

  --font-display: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: "Inter", "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono",
    Consolas, "Liberation Mono", monospace;

  /* Shared reading measure: prose and detail-page heads align to one column */
  --measure-read: 34rem;

  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
  --space-3xl: 6.5rem;

  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-micro: 120ms;
}

html[data-theme="dark"] {
  --paper: #121417;
  --paper-2: #191b20;
  --rule: #2a2e36;
  --ink: #e9ebef;
  --ink-body: #c6cad3;
  --ink-soft: #a9afba;
  --ink-muted: #828690;
  --accent: #86a1ef;
  --accent-soft: rgba(134, 161, 239, 0.12);
}

@media (prefers-color-scheme: dark) {
  html[data-theme="system"],
  html:not([data-theme]) {
    --paper: #121417;
    --paper-2: #191b20;
    --rule: #2a2e36;
    --ink: #e9ebef;
    --ink-body: #c6cad3;
    --ink-soft: #a9afba;
    --ink-muted: #828690;
    --accent: #86a1ef;
    --accent-soft: rgba(134, 161, 239, 0.12);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body {
  margin: 0;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== Masthead (inner pages) ===== */
.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
  transition: box-shadow var(--dur-micro) var(--ease-out);
}
.masthead.scrolled {
  box-shadow: 0 1px 0 var(--rule);
}
body.home .masthead { display: none; }
body.index-page .masthead { display: none; }
.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 4rem;
}
.brand {
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}
.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-micro) var(--ease-out);
}
.nav-link__num {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.nav-link:hover { color: var(--ink); }
.nav-link.active { color: var(--ink); border-bottom-color: var(--accent); }
.masthead__actions { display: flex; align-items: center; gap: 0.75rem; }
.masthead__inline-actions { display: flex; align-items: center; gap: 0.75rem; }
.masthead__menu-actions { display: none; }
.lang-switch {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  padding: 0.45rem 0.8rem;
  transition: color var(--dur-micro) var(--ease-out),
    border-color var(--dur-micro) var(--ease-out);
}
.lang-switch:hover { color: var(--accent); border-color: var(--accent); }
.lang-switch-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.lang-switch--current {
  opacity: 0.55;
  pointer-events: none;
}
/* ===== Language drawer (mobile menu) ===== */
.lang-drawer { display: none; border-bottom: 1px solid var(--rule); }
.lang-drawer__toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 12px 0;
  background: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}
.lang-drawer__toggle-current {
  margin-left: auto;
  color: var(--ink);
}
.lang-drawer__arrow {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--ink-soft);
  transition: transform 200ms var(--ease-out);
}
.lang-drawer.is-open .lang-drawer__arrow { transform: rotate(180deg); }
.lang-drawer__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 240ms var(--ease-out);
}
.lang-drawer.is-open .lang-drawer__panel { max-height: 240px; }
.lang-drawer__panel-inner { padding-top: 12px; }
.lang-drawer__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 40px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  transition: color var(--dur-micro) var(--ease-out),
    border-color var(--dur-micro) var(--ease-out);
}
.lang-drawer__btn + .lang-drawer__btn { margin-top: 8px; }
.lang-drawer__btn:hover { color: var(--accent); border-color: var(--accent); }
.lang-drawer__btn--current {
  opacity: 0.55;
  pointer-events: none;
}
.theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--rule);
}
.theme-choice {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
  color: var(--ink-soft);
  padding: 0.42rem 0.55rem;
  cursor: pointer;
  transition: color var(--dur-micro) var(--ease-out),
    border-color var(--dur-micro) var(--ease-out);
}
.theme-choice:hover { color: var(--ink); }
.theme-choice[aria-pressed="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span {
  display: block;
  width: 1.25rem;
  height: 1px;
  background: var(--ink);
  margin: 0.35rem 0;
  transition: transform 120ms var(--ease-out);
}
.masthead.nav-open .nav-toggle span:first-child { transform: translateY(0.18rem) rotate(45deg); }
.masthead.nav-open .nav-toggle span:last-child { transform: translateY(-0.18rem) rotate(-45deg); }
.bp-drawer-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.5rem;
}
.bp-drawer-toggle__dots {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 1.25rem;
}
.bp-drawer-toggle__dots span {
  display: block;
  width: 1.25rem;
  height: 1px;
  background: var(--ink);
}
.bp-drawer {
  display: none;
  position: absolute;
  top: calc(100% + 0.25rem);
  right: 1.25rem;
  width: min(19rem, calc(100vw - 2.5rem));
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.14);
  padding: 0.75rem;
  z-index: 400;
}
.bp-drawer[hidden] { display: none; }
.bp-drawer__group + .bp-drawer__group {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
}
.bp-drawer__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}

/* ===== Section scaffolding ===== */
.section { padding: 2.5rem 0; }
.page .section {
  padding: 0;
  margin-bottom: var(--space-3xl);
  scroll-margin-top: 5rem;
}
.page-head { padding: 5.5rem 0 2rem; }
.page-head__title,
.article-head__title {
  font-weight: 600;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 1.25rem;
  text-wrap: balance;
  overflow-wrap: anywhere;
}
.page-head__intro {
  font-size: 1.125rem;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0;
  font-family: var(--font-body);
}
body.index-page .page-head__title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 var(--space-md);
}
body.index-page .page-head__intro {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink-body);
  font-family: var(--font-body);
}
.index-page .page { animation: page-in 0.35s var(--ease-out) both; }
@keyframes page-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ===== Index-First layout (home) ===== */
.page {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: var(--space-3xl);
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--space-2xl) 2rem var(--space-3xl);
}
.toc {
  position: sticky;
  top: 5.5rem;
  align-self: start;
  height: fit-content;
}
.toc__brand {
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 var(--space-3xs);
}
a.toc__brand { display: inline-block; }
a.toc__brand:hover { color: var(--accent); }
.toc__role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  display: block;
  margin: 0 0 var(--space-xl);
}
.toc__list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-xl);
  display: grid;
  gap: var(--space-2xs);
  border-top: 1px solid var(--rule);
  padding-top: var(--space-md);
}
.toc__list a {
  display: grid;
  grid-template-columns: 3.5ch 1fr;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  padding: var(--space-3xs) 0;
  transition: color var(--dur-micro) var(--ease-out);
}
.toc__list .num { color: var(--accent); font-variant-numeric: tabular-nums; }
.toc__list a:hover { color: var(--ink); }
.toc__list a.active { color: var(--ink); }
.toc__list a.active {
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 0.25rem 0.5rem;
  margin: 0 -0.5rem;
}
.toc__meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  border-top: 1px solid var(--rule);
  padding-top: var(--space-sm);
  display: grid;
  gap: var(--space-3xs);
}
.toc__lang {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
  width: fit-content;
  transition: color var(--dur-micro) var(--ease-out),
    border-color var(--dur-micro) var(--ease-out);
}
.toc__lang:hover { color: var(--accent); border-color: var(--accent); }
.toc__lang-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.toc__lang--current {
  opacity: 0.55;
  pointer-events: none;
}

.main { min-width: 0; max-width: 56rem; }
.section__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-md);
}
.section__head {
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-lg);
  color: var(--ink);
  text-wrap: balance;
}
.section__head--lede { font-size: clamp(2.5rem, 5vw, 4rem); }
.section__body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink-body);
  max-width: 60ch;
}
.section__body p { margin: 0 0 var(--space-md); }
.section__body p:last-child { margin-bottom: 0; }
.section__body strong { color: var(--ink); font-weight: 600; }
.section__skills {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink-soft);
  margin-top: var(--space-md);
}
.section__link { margin-top: var(--space-lg); }

/* ===== Tabular rows (work / writing) ===== */
.rows { border-top: 1px solid var(--rule); }
.row {
  position: relative;
  display: grid;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  padding: 1.25rem 2.25rem 1.25rem 0.75rem;
  margin: 0 -0.75rem;
  border-bottom: 1px solid var(--rule);
  border-radius: 8px;
  color: var(--ink);
  transition: background-color var(--dur-micro) var(--ease-out),
    color var(--dur-micro) var(--ease-out),
    padding-left var(--dur-micro) var(--ease-out);
}
.row:hover {
  background: var(--paper-2);
  padding-left: 1.125rem;
}
.row::after {
  content: '→';
  position: absolute;
  top: 50%;
  right: 0.5rem;
  transform: translateY(-50%);
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--dur-micro) var(--ease-out),
    transform var(--dur-micro) var(--ease-out);
}
.row:hover::after {
  opacity: 1;
  transform: translateY(-50%) translateX(-2px);
}
.row--work { grid-template-columns: 3.5ch 8ch minmax(0, 1fr) auto; }
.row--post { grid-template-columns: 11ch minmax(0, 1fr) auto; }
.row__num,
.row__date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}
.row:hover .row__num { color: var(--accent); }
.row__title {
  font-weight: 500;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  padding-bottom: 2px;
  transition: color var(--dur-micro) var(--ease-out),
    background-size var(--dur-micro) var(--ease-out);
}
.row:hover .row__title { color: var(--accent); background-size: 100% 1px; }
.row__tags {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-align: right;
  white-space: nowrap;
}
.row__body { display: grid; gap: 0.25rem; min-width: 0; }
.row__summary {
  display: block;
  font-size: 0.875rem;
  color: var(--ink-soft);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.row__meta {
  display: grid;
  gap: 0.25rem;
  justify-items: end;
  text-align: right;
  min-width: 0;
}
.row__role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}
.row__excerpt {
  display: block;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

/* ===== Article head ===== */
.article-head { padding: 5.5rem 0 2rem; }
.article-head__summary {
  font-family: var(--font-body);
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--ink-body);
  max-width: 58ch;
  margin: 0 0 var(--space-lg);
}
.article-head__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  border-top: 1px solid var(--rule);
  margin: 0 0 var(--space-lg);
  padding: 0;
  max-width: 52rem;
}
.article-head__meta > div {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--rule);
}
.article-head__meta dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  width: 7rem;
  margin: 0;
}
.article-head__meta dd {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}
.article-head__meta--essay {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 64rem;
}
.article-head__links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

/* ===== Pager (prev / next) ===== */
.pager {
  display: flex;
  gap: var(--space-md);
  justify-content: space-between;
  border-top: 1px solid var(--rule);
  padding-top: var(--space-md);
  margin: 0 0 var(--space-lg);
}
.pager__item {
  display: grid;
  gap: 0.25rem;
  max-width: 48%;
  min-width: 0;
}
.pager__item--next {
  margin-left: auto;
  text-align: right;
  justify-items: end;
}
.pager__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}
.pager__title {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--dur-micro) var(--ease-out);
}
.pager__item:hover .pager__title { color: var(--accent); }

/* ===== Prose ===== */
.prose {
  max-width: var(--measure-read);
  margin: 0 auto;
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--ink-body);
}
.prose h2 {
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: var(--space-xl) 0 var(--space-sm);
}
.prose h3 {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--ink);
  margin: 2.25rem 0 var(--space-xs);
}
.prose p { margin: 0 0 1.25rem; }
.prose ul,
.prose ol { padding-left: 1.25rem; margin: 0 0 1.25rem; }
.prose li { margin: 0.4rem 0; }
.prose blockquote {
  margin: var(--space-lg) 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}
.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur-micro) var(--ease-out);
}
.prose a:hover { color: var(--ink); }
.prose pre {
  margin: var(--space-lg) 0;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}
.prose code { font-family: var(--font-mono); font-size: 0.875em; }
.prose p code,
.prose li code {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 0.1rem 0.35rem;
}
.prose img { border: 1px solid var(--rule); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: var(--space-xl) 0; }
.prose strong { font-weight: 600; }
.prose h2,
.prose h3 { scroll-margin-top: 5rem; }
.prose .table-wrap {
  overflow-x: auto;
  margin: 0 0 var(--space-lg);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
}
.prose th,
.prose td {
  border: 1px solid var(--rule);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}
.prose th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper-2);
}
.prose tbody tr:nth-child(even) td { background: var(--paper-2); }

/* ===== Rich article blocks (Hallmark · component: article-prose · theme: Plain) ===== */
.prose .prose-figure {
  margin: var(--space-lg) 0;
}
.prose .prose-figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.prose .prose-figure figcaption {
  margin-top: var(--space-2xs);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--ink-muted);
  text-align: center;
}
.prose mark {
  background: var(--accent-soft);
  color: inherit;
  padding: 0 0.18em;
  border-radius: 2px;
}
.prose .callout {
  margin: var(--space-lg) 0;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}
.prose .callout--tip { border-left-width: 2px; }
.prose .callout--warning {
  border-left-width: 4px;
  background: var(--paper-2);
}
.prose .callout__label {
  margin: 0 0 var(--space-2xs);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.prose .callout--warning .callout__label { color: var(--ink); }
.prose .callout__body p { margin: 0 0 var(--space-2xs); }
.prose .callout__body p:last-child { margin-bottom: 0; }
.prose li.task-list-item {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.prose li.task-list-item input[type="checkbox"] {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--accent);
  transform: translateY(2px);
}
.prose pre[data-lang] {
  position: relative;
  padding-top: calc(var(--space-sm) + 1.1rem);
}
.prose pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.55rem;
  right: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.prose h2,
.prose h3 { position: relative; }
.prose .heading-anchor {
  display: inline-block;
  margin-left: 0.35em;
  font-family: var(--font-mono);
  font-size: 0.7em;
  font-weight: 500;
  color: var(--ink-muted);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--dur-micro) var(--ease-out);
}
.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.prose .heading-anchor:focus-visible { opacity: 1; }

/* ===== Long-form essays ===== */
.essay-layout { padding: 0 0 var(--space-3xl); }
.essay-layout__inner {
  display: grid;
  grid-template-columns: 15rem minmax(0, 44rem);
  gap: var(--space-3xl);
  justify-content: center;
  align-items: start;
}
.essay-toc-wrap {
  position: sticky;
  top: 6rem;
}
.essay-toc__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-sm);
  margin: 0 0 var(--space-sm);
}
.essay-toc__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}
.essay-toc__toggle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  transition: color var(--dur-micro) var(--ease-out);
}
.essay-toc__toggle:hover { color: var(--accent); }
.essay-toc__toggle:focus-visible { outline-offset: 3px; }
.essay-toc-wrap .toc__list {
  display: grid;
  gap: 0.25rem;
  border-top: 0;
  padding-top: 0;
  margin: 0;
}
.essay-toc-wrap .toc__list a { padding: 0.25rem 0; }
.toc-group + .toc-group {
  border-top: 1px solid var(--rule);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
}
.toc-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
}
.toc-group__head a { flex: 1; }
.toc-group-toggle {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  transition: color var(--dur-micro) var(--ease-out);
}
.toc-group-toggle:hover { color: var(--accent); }
.toc-group-toggle:focus-visible { outline-offset: 3px; }
.toc-subs {
  list-style: none;
  margin: var(--space-2xs) 0 0;
  padding: 0;
}
.toc-subs[hidden] { display: none; }
.toc-subs a .toc__text { padding-left: 1rem; }
.toc-progress {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}
.toc-progress__track {
  flex: 1;
  height: 2px;
  background: var(--rule);
  overflow: hidden;
}
.toc-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 80ms linear;
}
.toc-progress__num { font-variant-numeric: tabular-nums; }
.essay-prose {
  max-width: 44rem;
  margin: 0;
  font-size: 1.1875rem;
  line-height: 1.9;
  font-family: Georgia, "Noto Serif SC", "Source Han Serif SC",
    "Songti SC", "STSong", "SimSun", serif;
  counter-reset: essay-chapter;
}
.essay-prose h2::before {
  counter-increment: essay-chapter;
  content: counter(essay-chapter, decimal-leading-zero) " · ";
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.essay-end {
  display: grid;
  place-items: center;
  padding: var(--space-2xl) 0 var(--space-lg);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 1.25rem;
}
.essay-cover {
  margin: 0 0 var(--space-lg);
}
.essay-cover img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: 8px;
}
.essay-prose > p:first-of-type {
  font-size: 1.3rem;
  line-height: 1.75;
  color: var(--ink);
  font-weight: 500;
}
.essays-empty {
  font-family: var(--font-body);
  color: var(--ink-soft);
  padding: var(--space-lg) 0;
  margin: 0;
}

/* ===== Links ===== */
.text-link {
  color: var(--accent);
  font-weight: 500;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  padding-bottom: 2px;
  transition: color var(--dur-micro) var(--ease-out),
    background-size var(--dur-micro) var(--ease-out);
}
.text-link:hover { color: var(--ink); background-size: 100% 1px; }

/* ===== Contact ===== */
.contact-rows {
  max-width: 52rem;
  border-top: 1px solid var(--rule);
}
.contact-row {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-md);
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
  transition: color var(--dur-micro) var(--ease-out);
}
.contact-row__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.contact-row__value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ink);
  word-break: break-word;
  transition: color var(--dur-micro) var(--ease-out);
}
.contact-row:hover .contact-row__label,
.contact-row:hover .contact-row__value { color: var(--accent); }
.contact-row--plain { cursor: default; }
.contact-row--plain:hover .contact-row__label,
.contact-row--plain:hover .contact-row__value { color: var(--ink-soft); }
.contact-note {
  margin-top: var(--space-lg);
  color: var(--ink-soft);
  max-width: 60ch;
  font-family: var(--font-body);
}
.contact-note p { margin: 0; }

/* ===== Colophon ===== */
.colophon {
  border-top: 1px solid var(--rule);
  padding: var(--space-lg) 0;
  margin-top: var(--space-lg);
}
.colophon__inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
}
.colophon__admin {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted var(--ink-muted);
  padding-bottom: 1px;
}
.colophon__admin:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ===== Root language index ===== */
.root-body { min-height: 100vh; }
.root-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 100vh;
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 2rem;
}
.root-brand { align-self: center; }
.root-brand__name {
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-2xs);
}
.root-brand__role {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  margin: 0 0 var(--space-lg);
}
.root-brand__meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  margin: 0;
}
.root-theme { margin-top: var(--space-lg); }
.root-links {
  align-self: center;
  border-top: 1px solid var(--rule);
}
.root-link {
  display: grid;
  grid-template-columns: 3.5ch 1fr auto;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--rule);
  font-size: 1.25rem;
  font-weight: 500;
  transition: color var(--dur-micro) var(--ease-out);
}
.root-link .num { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--accent); }
.root-link .arrow {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ink-muted);
  transition: transform var(--dur-micro) var(--ease-out);
}
.root-link:hover { color: var(--accent); }
.root-link:hover .arrow { transform: translateX(4px); }

/* ===== Motion: reveal / letters / progress ===== */
.js-reveal {
  opacity: 0;
  transform: translateY(14px);
}
.js-reveal.is-inview {
  animation: reveal-in 0.55s var(--ease-out) both;
  animation-delay: var(--reveal-delay, 0ms);
}
@keyframes reveal-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

/* TOC index: staggered typeset entrance */
.toc__list a {
  opacity: 0;
  animation: toc-in 0.45s var(--ease-out) forwards;
}
.toc__list li:nth-child(1) a { animation-delay: 0.3s; }
.toc__list li:nth-child(2) a { animation-delay: 0.38s; }
.toc__list li:nth-child(3) a { animation-delay: 0.46s; }
.toc__list li:nth-child(4) a { animation-delay: 0.54s; }
.toc__list li:nth-child(5) a { animation-delay: 0.62s; }
.toc__list li:nth-child(6) a { animation-delay: 0.7s; }
@keyframes toc-in {
  from { opacity: 0; transform: translateY(0.3em); }
  to { opacity: 1; transform: none; }
}

/* Section heads: hairline draws in once revealed */
.section__head {
  position: relative;
  padding-bottom: 0.4rem;
}
.section__head::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 3.5rem;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
}
.section__head.is-inview::after {
  animation: rule-draw 0.55s var(--ease-out) 0.22s both;
}
@keyframes rule-draw {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.toc__brand .letter {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.45em);
  animation: letter-in 0.5s var(--ease-out) forwards;
  animation-delay: var(--letter-delay, 0s);
}
@keyframes letter-in {
  to { opacity: 1; transform: none; }
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 100;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: var(--accent);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  color: var(--ink);
  font-size: 1.125rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity var(--dur-micro) var(--ease-out),
    transform var(--dur-micro) var(--ease-out),
    background-color var(--dur-micro) var(--ease-out),
    color var(--dur-micro) var(--ease-out);
}
.to-top.show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.to-top:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== Responsive ===== */
@media (max-width: 68rem) {
  .page {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    padding-top: var(--space-xl);
  }
  .essay-layout__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .essay-toc-wrap {
    position: static;
    border-bottom: 1px solid var(--rule);
    padding-bottom: var(--space-lg);
    margin-bottom: var(--space-md);
  }
  .essay-toc-wrap,
  .essay-prose { min-width: 0; }
  .essay-toc-wrap .toc__list { display: none; }
  .essay-toc-wrap .toc__list.is-open { display: grid; }
  .toc-progress { display: none; }
  .article-head__meta--essay {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .toc {
    position: static;
    border-bottom: 1px solid var(--rule);
    padding-bottom: var(--space-lg);
  }
  .toc__role { margin-bottom: var(--space-md); }
  .toc > nav .toc__list {
    grid-template-columns: repeat(5, auto);
    justify-content: start;
    gap: 0 var(--space-md);
    border-top: 0;
    padding-top: 0;
    margin-bottom: var(--space-md);
  }
  .toc > nav .toc__list a { grid-template-columns: 2.5ch 1fr; gap: 0.5rem; }
  .toc__meta { border-top: 0; padding-top: 0; grid-template-columns: repeat(3, auto); gap: var(--space-sm); }
}

@media (min-width: 68.01rem) {
  .essay-toc__toggle { display: none; }
}

@media (max-width: 48rem) {
  .container { padding: 0 1.25rem; }
  .page { padding: var(--space-xl) 1.25rem var(--space-2xl); }
  .article-head__meta--essay {
    grid-template-columns: 1fr;
  }
  .masthead__inner { height: 3.75rem; gap: 1rem; }
  .masthead__actions { gap: 0.4rem; }
  .masthead__inline-actions { display: none; }
  .theme-choice { padding: 0.35rem 0.4rem; font-size: 0.65rem; }
  .toc > nav .toc__list {
    grid-template-columns: repeat(5, max-content);
    gap: 0 var(--space-sm);
    overflow-x: auto;
  }
  .toc__meta { grid-template-columns: 1fr; }
  .site-nav {
    display: flex;
    position: static;
    flex: 1 1 auto;
    min-width: 0;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.25rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    border-bottom: 0;
    padding: 0;
  }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav .nav-link {
    flex: 0 0 auto;
  }
  .bp-drawer-toggle { display: block; }
  .bp-drawer {
    display: block;
    top: calc(100% + 0.25rem);
    right: 1.25rem;
  }
  .bp-drawer .theme-switch { width: 100%; }
  .bp-drawer .theme-choice { flex: 1; text-align: center; }
  .bp-drawer .lang-switch-group {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .bp-drawer .lang-switch {
    display: block;
    border: 0;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--rule);
  }
  .bp-drawer .lang-switch:last-child,
  .bp-drawer .lang-switch--current:last-child { border-bottom: 0; }
  .page-head,
  .article-head { padding: 3.75rem 0 1.5rem; }
  .section { padding: 2rem 0; }

  .row--work {
    grid-template-columns: 3.5ch minmax(0, 1fr);
    row-gap: 0.25rem;
  }
  .row--work .row__num { grid-column: 1; grid-row: 1 / span 2; }
  .row--work .row__date { grid-column: 2; grid-row: 1; }
  .row--work .row__body { grid-column: 2; grid-row: 2; }
  .row--work .row__meta { grid-column: 2; grid-row: 3; justify-items: start; text-align: left; }
  .row--work .row__tags,
  .row--work .row__summary { white-space: normal; }
  .row--post { grid-template-columns: 1fr; gap: 0.25rem; }
  .row--post .row__num { grid-column: 1; grid-row: 1; }
  .row--post .row__body { grid-column: 1; grid-row: 2; }
  .row--post .row__tags { grid-column: 1; grid-row: 3; text-align: left; white-space: normal; }
  .pager__title { white-space: normal; }
  .to-top { right: 1rem; bottom: 1rem; width: 2.5rem; height: 2.5rem; }
  .contact-row { grid-template-columns: 7rem minmax(0, 1fr); }
  .root-page {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl) 1.25rem;
  }
  .root-brand { align-self: start; }
  .root-links { align-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
  .js-reveal,
  .toc__brand .letter,
  .toc__list a {
    opacity: 1 !important;
    transform: none !important;
  }
  .section__head::after {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
}

/* ==========================================================================
 * 2026-09-02 优化：分页规范 · 正文块显现 · 防呆加固（与主题升级同步）
 * ========================================================================== */

/* 1. 分页条规范化：长标题格内折行（不再省略号截断），单一项靠对应侧 */
.pager {
  flex-wrap: nowrap;
  align-items: flex-start;
}
.pager__item {
  flex: 0 1 50%;
  max-width: 50%;
}
.pager__item:only-child { flex: 0 1 auto; }
.pager__item:only-child.pager__item--next { margin-left: auto; }
.pager__item:only-child.pager__item--prev { margin-right: auto; }
.pager__title {
  white-space: normal;
  text-overflow: clip;
  overflow-wrap: anywhere;
  min-width: 0;
}
@media (max-width: 40rem) {
  .pager {
    flex-direction: column;
    align-items: stretch;
  }
  .pager__item {
    flex: 1 1 auto;
    max-width: 100%;
  }
  .pager__item--next {
    margin-left: 0;
    text-align: left;
    justify-items: start;
  }
}

/* 2. 正文块柔和滚动显现 */
.prose blockquote.js-reveal,
.prose pre.js-reveal,
.prose .callout.js-reveal,
.prose .prose-figure.js-reveal,
.table-wrap.js-reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s var(--ease-out),
    transform 0.5s var(--ease-out);
}
.prose blockquote.js-reveal.is-inview,
.prose pre.js-reveal.is-inview,
.prose .callout.js-reveal.is-inview,
.prose .prose-figure.js-reveal.is-inview,
.table-wrap.js-reveal.is-inview {
  opacity: 1;
  transform: none;
  animation: none;
}

/* 3. 显现防呆：is-inview 直接显形，不依赖动画填充 */
.js-reveal.is-inview {
  opacity: 1;
  transform: none;
}

/* 4. 入场防呆：TOC 与品牌字母默认可见 + backwards 填充 */
.toc__list a {
  opacity: 1;
  animation-fill-mode: backwards;
}
.toc__brand .letter {
  opacity: 1;
  animation-fill-mode: backwards;
}

/* 5. hover / 键盘等价态 */
.row:hover,
.row:focus-visible {
  background: var(--paper-2);
  padding-left: 1.125rem;
}
.row:hover::after,
.row:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(-2px);
}
.root-link:hover,
.root-link:focus-visible {
  color: var(--accent);
}
.root-link:hover .arrow,
.root-link:focus-visible .arrow {
  transform: translateX(4px);
}

/* ===== Print (long-form essays save nicely as PDF) ===== */
@media print {
  .masthead,
  .to-top,
  .reading-progress,
  .essay-toc-wrap,
  .nav-toggle { display: none !important; }
  .js-reveal, .js-reveal.is-inview,
  .toc__list a,
  .toc__brand .letter {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
  .section__head::after { transform: none !important; animation: none !important; }
  body { background: #fff !important; color: #000 !important; }
  .container { max-width: none; }
  .article-head { padding: 0 0 var(--space-md); }
  .essay-layout { padding: 0; }
  .essay-layout__inner { display: block; }
  .essay-prose {
    max-width: none;
    margin: 0;
    font-size: 1rem;
    line-height: 1.7;
  }
  .prose a { color: #000; }
  .prose a::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #444;
  }
  .prose h2,
  .prose h3 { page-break-after: avoid; break-after: avoid; }
  .prose pre,
  .prose table,
  .prose .table-wrap { page-break-inside: avoid; break-inside: avoid; }
  .essay-end { color: #444; }
}

/* ---- 风格档案（classic 版） ---- */
.colophon__styles {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.archive-rule {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-transform: uppercase;
}
.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: var(--space-lg);
}
.style-card {
  position: relative;
  border-top: 1px solid var(--rule);
  padding-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.style-card__preview {
  display: block;
  border: 1px solid var(--rule);
  line-height: 0;
}
.style-card__preview img {
  width: 100%;
  height: auto;
  display: block;
}
.style-card__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}
.style-card__week {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}
.style-card__name {
  font-size: 1.25rem;
  margin: 0;
}
.style-card__summary {
  color: var(--ink-soft);
  margin: 0;
}
.style-card__link {
  margin-top: var(--space-2xs);
}
.style-card__badge {
  position: absolute;
  top: var(--space-sm);
  right: 0;
  background: var(--accent);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 6px;
}