/* Hallmark · genre: editorial · macrostructure: Index-First · theme: Almanac
 * nav: N13 inline search pill · footer: Ft4 dense colophon · enrichment: none
 * design-system: design.md · designed-as-app
 * tone: utilitarian-editorial · anchor hue: seal vermilion (30) · paper band: light
 * pre-emit critique: P5 H4 E5 S5 R5 V5
 */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; overflow-x: clip; background: var(--color-paper); }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  background: var(--color-paper);
  color: var(--color-ink);
  overflow-x: clip;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  transition: background-color 300ms var(--ease-out), color 300ms var(--ease-out);
}

a { color: inherit; }
::selection { background: var(--color-accent); color: var(--color-accent-ink); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  inset-inline-start: var(--space-md);
  top: -100px;
  z-index: var(--z-modal);
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
}
.skip-link:focus { top: var(--space-md); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------------- header · N13 inline search pill ---------------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-paper);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.head-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-sm) clamp(1rem, 4vw, 2rem);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  text-decoration: none;
  color: var(--color-ink);
  white-space: nowrap;
  flex-shrink: 0;
}
.wordmark__cn {
  font-family: var(--font-outlier);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.wordmark__en {
  font-family: var(--font-outlier);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--color-ink-3);
}
.wordmark__cn .box { color: var(--color-accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-inline-start: auto;
}
.site-nav a {
  font-size: var(--text-sm);
  color: var(--color-ink-3);
  text-decoration: none;
  white-space: nowrap;
  padding-block: var(--space-2xs);
  border-bottom: 2px solid transparent;
  transition: color var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out);
}
.site-nav a:hover { color: var(--color-ink); }
.site-nav a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.search {
  position: relative;
  flex: 0 1 260px;
  min-width: 0;
}
.search input {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-pill);
  padding: 0.42rem 4.6rem 0.42rem 0.9rem;
  transition: border-color var(--dur-micro) var(--ease-out);
}
.search input::placeholder { color: var(--color-ink-3); }
.search input:focus {
  outline: none;
  border-color: var(--color-focus);
}
.search input:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.search__hint {
  position: absolute;
  inset-inline-end: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-outlier);
  font-size: 0.62rem;
  color: var(--color-ink-3);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: 0.05rem 0.3rem;
  pointer-events: none;
}

.tb-suggest {
  position: absolute;
  top: calc(100% + 0.4rem);
  inset-inline: 0;
  z-index: var(--z-dropdown);
  background: var(--color-paper);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-whisper);
  overflow: hidden auto;
  max-height: 340px;
}
.tb-suggest[hidden] { display: none; }
.tb-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.55rem 0.85rem;
  text-decoration: none;
  color: var(--color-ink);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  transition: background-color var(--dur-micro) var(--ease-out);
}
.tb-item:last-child { border-bottom: none; }
.tb-item:hover,
.tb-item[aria-selected="true"] { background: var(--color-accent-soft); }
.tb-item__n {
  font-size: var(--text-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tb-item__c {
  font-family: var(--font-outlier);
  font-size: 0.66rem;
  color: var(--color-ink-3);
  flex-shrink: 0;
}
.tb-empty {
  padding: 0.7rem 0.85rem;
  font-size: var(--text-sm);
  color: var(--color-ink-3);
  margin: 0;
}
.tb-live {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: var(--rule-hair) solid transparent;
  background: transparent;
  border-radius: var(--radius-md);
  color: var(--color-ink-3);
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--dur-micro) var(--ease-out), background-color var(--dur-micro) var(--ease-out);
}
.theme-toggle:hover { color: var(--color-ink); background: var(--color-paper-2); }

.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  place-items: center;
  border: var(--rule-hair) solid var(--color-rule);
  background: transparent;
  border-radius: var(--radius-md);
  color: var(--color-ink-2);
  cursor: pointer;
  flex-shrink: 0;
}

.mobile-nav {
  display: none;
  border-top: var(--rule-hair) solid var(--color-rule);
}
.mobile-nav[data-open="true"] { display: block; }
.mobile-nav a {
  display: block;
  padding: 0.7rem clamp(1rem, 4vw, 2rem);
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  text-decoration: none;
  border-bottom: var(--rule-hair) solid var(--color-rule);
}
.mobile-nav a[aria-current="page"] { color: var(--color-accent); }

/* ---------------- page frame ---------------- */

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

main { display: block; padding-bottom: var(--space-3xl); flex: 1 0 auto; }

/* ---------------- home · index-first ---------------- */

.index-intro {
  padding-block: clamp(2.25rem, 5vw, 3.5rem) 0;
  max-width: 52rem;
}
.index-intro h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-display);
  line-height: 1.24;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}
.index-intro p {
  margin-top: var(--space-md);
  color: var(--color-ink-2);
  max-width: 56ch;
}
.index-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem var(--space-lg);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: var(--rule-hair) solid var(--color-rule);
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  color: var(--color-ink-3);
  font-variant-numeric: tabular-nums;
}
.index-meta b { color: var(--color-ink); font-weight: 500; }

.idx { margin-top: var(--space-2xl); }
.idx:first-of-type { margin-top: var(--space-xl); }

.idx-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-ink);
}
.idx-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.idx-count {
  font-family: var(--font-outlier);
  font-size: 0.68rem;
  color: var(--color-ink-3);
  font-variant-numeric: tabular-nums;
}
.idx-more {
  margin-inline-start: auto;
  font-family: var(--font-outlier);
  font-size: 0.7rem;
  color: var(--color-ink-3);
  text-decoration: none;
  white-space: nowrap;
}
.idx-more:hover { color: var(--color-accent); }

.idx-row {
  display: grid;
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr) 1.25rem;
  gap: var(--space-md);
  align-items: baseline;
  padding: 0.78rem 0;
  border-bottom: var(--rule-hair) solid var(--color-rule);
  text-decoration: none;
}
.idx-name {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-ink);
  overflow-wrap: anywhere;
  transition: color var(--dur-micro) var(--ease-out);
}
.idx-desc {
  font-size: var(--text-sm);
  color: var(--color-ink-3);
  line-height: 1.65;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.idx-mark {
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  color: var(--color-ink-3);
  text-align: end;
  opacity: 0;
  transform: translateX(-2px);
  transition: opacity var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out);
}
.idx-row:hover .idx-name { color: var(--color-accent); }
.idx-row:hover .idx-mark { opacity: 1; transform: translateX(0); color: var(--color-accent); }
.idx-row:active .idx-name { color: var(--color-accent-deep); }

.idx-row--post {
  grid-template-columns: minmax(0, 21rem) minmax(0, 1fr) 6.5rem 1.25rem;
}
.idx-date {
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  color: var(--color-ink-3);
  white-space: nowrap;
  text-align: end;
  font-variant-numeric: tabular-nums;
}

/* ---------------- sub-page head ---------------- */

.page-head { padding-block: var(--space-xl) var(--space-lg); }
.page-head .k {
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}
.page-head h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 1.1rem + 2vw, 2.2rem);
  line-height: 1.3;
  letter-spacing: -0.008em;
  overflow-wrap: anywhere;
}
.page-head .sub {
  margin-top: var(--space-sm);
  color: var(--color-ink-2);
  max-width: 60ch;
}
.page-meta {
  margin-top: var(--space-sm);
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  color: var(--color-ink-3);
}

/* ---------------- breadcrumb ---------------- */

.tb-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding-top: var(--space-md);
  font-family: var(--font-outlier);
  font-size: 0.7rem;
  color: var(--color-ink-3);
}
.tb-breadcrumb a { color: var(--color-ink-3); text-decoration: none; white-space: nowrap; }
.tb-breadcrumb a:hover { color: var(--color-ink); text-decoration: underline; text-underline-offset: 3px; }
.tb-breadcrumb .sep { color: var(--color-rule-strong); }
.tb-breadcrumb .current { color: var(--color-ink-2); white-space: nowrap; }
@media (max-width: 520px) {
  .tb-breadcrumb { flex-wrap: nowrap; }
  .tb-breadcrumb a,
  .tb-breadcrumb .sep { flex: 0 0 auto; }
  .tb-breadcrumb .current { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
}

/* ---------------- legacy list components (kept for tool pages / 404) ---------------- */

.group { margin-bottom: var(--space-xl); }
.group-title {
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-3);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  padding-bottom: var(--space-2xs);
  margin-bottom: var(--space-2xs);
}
.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-sm);
  padding-block: var(--space-md);
}
.nav-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  transition: border-color var(--dur-micro) var(--ease-out), background-color var(--dur-micro) var(--ease-out);
}
.nav-card:hover { border-color: var(--color-rule-strong); background: var(--color-paper-2); }
.nav-card__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--color-ink);
}
.nav-card__name .arrow {
  display: inline-block;
  font-family: var(--font-outlier);
  font-size: 0.72rem;
  color: var(--color-ink-3);
  font-weight: 400;
  transition: transform var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out);
}
.nav-card:hover .nav-card__name { color: var(--color-accent); }
.nav-card:hover .arrow { color: var(--color-accent); transform: translateX(2px); }
.nav-card__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-3);
  margin-top: 0.3rem;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-bottom: var(--rule-hair) solid var(--color-rule);
  padding: var(--space-md) 0;
  transition: background-color var(--dur-micro) var(--ease-out);
}
.card:hover { background: var(--color-paper-2); }
.card-row { display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-md); }
.card h2 { font-family: var(--font-display); font-weight: 700; font-size: var(--text-md); }
.card:hover h2 { color: var(--color-accent); }
.card .arrow {
  font-family: var(--font-outlier);
  color: var(--color-ink-3);
  flex-shrink: 0;
  transition: transform var(--dur-micro) var(--ease-out);
}
.card:hover .arrow { transform: translateX(3px); color: var(--color-accent); }
.card .desc { color: var(--color-ink-2); font-size: var(--text-sm); margin-top: 0.3rem; max-width: 64ch; }
.card .meta { font-family: var(--font-outlier); font-size: 0.7rem; color: var(--color-ink-3); margin-top: 0.35rem; }
.empty { color: var(--color-ink-3); padding: var(--space-lg) 0 var(--space-2xl); }

/* ---------------- tool shell (25 existing tool pages inherit this) ---------------- */

.tool-shell,
.game-shell { padding-bottom: var(--space-xl); }
.tool-shell textarea,
.tool-shell input[type="text"],
.tool-shell input[type="number"],
.tool-shell input[type="email"],
.tool-shell input[type="password"],
.tool-shell input[type="url"],
.tool-shell select {
  width: 100%;
  font-family: var(--font-outlier);
  font-size: 0.9rem;
  color: var(--color-ink);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color var(--dur-micro) var(--ease-out);
}
.tool-shell textarea:focus,
.tool-shell input:focus,
.tool-shell select:focus { outline: none; border-color: var(--color-focus); }
.tool-shell .btn,
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  text-align: center;
  border: 1px solid var(--color-ink);
  background: transparent;
  color: var(--color-ink);
  border-radius: var(--radius-md);
  padding: 0.48rem 1.15rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}
.tool-shell .btn:hover,
.btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.tool-shell .btn:active,
.btn:active { transform: translateY(1px); }
.tool-shell .btn-row,
.btn-row { display: flex; gap: var(--space-sm); flex-wrap: wrap; margin-block: var(--space-md); }
.field, .tool-shell .field { margin-bottom: var(--space-md); }
.field .fl,
.tool-shell .field .fl {
  display: block;
  font-family: var(--font-outlier);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-3);
  margin-bottom: var(--space-2xs);
}
.tool-shell .msg { font-family: var(--font-outlier); font-size: 0.78rem; margin-top: var(--space-sm); min-height: 1.4em; }
.tool-shell .msg.err { color: var(--color-accent); }
.tool-shell .msg.ok { color: var(--color-ink-2); }
.tool-shell label { display: flex; align-items: center; gap: var(--space-xs); font-size: var(--text-sm); color: var(--color-ink-2); cursor: pointer; }
.tool-shell output,
.tool-shell .result {
  display: block;
  font-family: var(--font-outlier);
  font-size: 0.92rem;
  color: var(--color-ink);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  margin-top: var(--space-md);
  word-break: break-all;
  min-height: 1.4em;
}
.field { margin-bottom: var(--space-md); }

/* calculator result tables (loan / ratios / sharpe …) */
.si-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); margin-top: var(--space-sm); }
.si-table th,
.si-table td {
  border-bottom: var(--rule-hair) solid var(--color-rule);
  padding: 0.5rem 0.6rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.si-table th {
  color: var(--color-ink-3);
  font-family: var(--font-outlier);
  font-weight: 400;
  font-size: 0.72rem;
}
.si-table td:first-child,
.si-table th:first-child { text-align: left; }
.si-table tfoot td { font-weight: 700; color: var(--color-accent); border-bottom: none; }
.si-summary { margin-top: var(--space-md); font-size: 0.95rem; color: var(--color-ink-2); line-height: 1.9; }
.si-summary b { color: var(--color-ink); }

.howto {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  border-left: 2px solid var(--color-accent);
  background: var(--color-paper-2);
  padding: 0.8rem 1.1rem;
  margin-bottom: var(--space-lg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.score-row { display: flex; gap: var(--space-md); margin-bottom: var(--space-md); flex-wrap: wrap; align-items: center; }
.score-box {
  font-family: var(--font-outlier);
  font-size: 0.78rem;
  color: var(--color-ink-2);
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.9rem;
  font-variant-numeric: tabular-nums;
}
.score-box b { color: var(--color-accent); font-size: 1rem; }

/* ---------------- prose / article ---------------- */

.prose {
  padding-block: var(--space-lg) var(--space-2xl);
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--color-ink-2);
  max-width: 68ch;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--color-ink);
  margin: var(--space-xl) 0 var(--space-sm);
  letter-spacing: -0.005em;
  line-height: 1.4;
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--color-ink);
  margin: var(--space-lg) 0 var(--space-xs);
  line-height: 1.45;
}
.prose p { margin-bottom: var(--space-md); }
.prose a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; overflow-wrap: anywhere; }
.prose a:hover { color: var(--color-accent-deep); }
.prose ul, .prose ol { padding-inline-start: 1.4rem; margin-bottom: var(--space-md); }
.prose li { margin-bottom: var(--space-2xs); }
.prose li::marker { color: var(--color-accent); }
.prose blockquote {
  border-left: 2px solid var(--color-accent);
  background: var(--color-paper-2);
  padding: var(--space-md) var(--space-lg);
  color: var(--color-ink);
  margin: var(--space-lg) 0;
}
.prose code {
  font-family: var(--font-outlier);
  font-size: 0.85em;
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
}
.prose pre {
  background: var(--color-paper-2);
  color: var(--color-ink);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  margin: var(--space-lg) 0;
  font-size: 0.86rem;
  line-height: 1.7;
}
.prose pre code { background: none; border: none; color: inherit; padding: 0; font-size: inherit; }
.prose hr { border: none; border-top: var(--rule-hair) solid var(--color-rule); margin: var(--space-xl) 0; }
.prose img { max-width: 100%; height: auto; border: var(--rule-hair) solid var(--color-rule); margin: var(--space-lg) 0; }
.prose strong { color: var(--color-ink); font-weight: 600; }
.prose table { width: 100%; border-collapse: collapse; margin: var(--space-lg) 0; font-size: var(--text-sm); }
.prose th, .prose td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: var(--rule-hair) solid var(--color-rule); }
.prose th { color: var(--color-ink); font-weight: 600; }

/* ---------------- article head ---------------- */

.back-link {
  display: inline-block;
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  color: var(--color-ink-3);
  text-decoration: none;
}
.back-link:hover { color: var(--color-accent); }

/* ---------------- faq / contact ---------------- */

.faq-list {
  display: flex;
  flex-direction: column;
  max-width: 68ch;
  border-top: var(--rule-hair) solid var(--color-rule);
}
.faq-item {
  padding: var(--space-md) 0;
  border-bottom: var(--rule-hair) solid var(--color-rule);
}
.faq-q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-ink);
  margin-bottom: var(--space-2xs);
}
.faq-a {
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--color-ink-2);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.contact-list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  font-size: var(--text-base);
}
.contact-list .lbl {
  min-width: 3.5rem;
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-3);
}
.contact-list a {
  min-width: 0;
  overflow-wrap: anywhere;
}
.muted-note {
  color: var(--color-ink-3);
  font-size: var(--text-sm);
  line-height: 1.9;
}

/* ---------------- error page ---------------- */

.error-page {
  max-width: 640px;
  padding-top: var(--space-2xl);
  text-align: center;
}
.error-code {
  font-family: var(--font-outlier);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.error-page h1 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-top: var(--space-sm);
  overflow-wrap: anywhere;
}
.error-sub {
  margin-top: var(--space-sm);
  color: var(--color-ink-2);
}
.nf-search { margin: var(--space-lg) auto 0; max-width: 420px; }
.nf-search input {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--text-base);
  padding: 0.6rem 0.95rem;
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
  color: var(--color-ink);
  border-radius: var(--radius-pill);
}
.nf-search input:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
.nf-results { padding-top: var(--space-md); text-align: start; }
.nf-results:empty { display: none; }
.error-actions { justify-content: center; }

/* ---------------- footer · Ft4 dense colophon ---------------- */

.site-foot {
  border-top: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper);
}
.colophon {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-xl) clamp(1rem, 4vw, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.colophon__line {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  line-height: 1.8;
  max-width: 78ch;
}
.colophon__meta {
  font-family: var(--font-outlier);
  font-size: 0.7rem;
  color: var(--color-ink-3);
  line-height: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.6rem;
  font-variant-numeric: tabular-nums;
}
.colophon__meta a { color: var(--color-ink-3); text-decoration: none; white-space: nowrap; }
.colophon__meta a:hover { color: var(--color-ink); text-decoration: underline; text-underline-offset: 3px; }
.colophon__meta .dot { color: var(--color-rule-strong); }

/* ---------------- responsive ---------------- */

@media (max-width: 860px) {
  .search { flex-basis: 200px; }
  .site-nav { gap: var(--space-md); }
  .idx-row {
    grid-template-columns: minmax(0, 1fr) 1rem;
    gap: 0.2rem var(--space-xs);
    padding: 0.7rem 0;
  }
  .idx-name { grid-row: 1; grid-column: 1; }
  .idx-desc { grid-column: 1 / -1; grid-row: 2; }
  .idx-mark { grid-row: 1; grid-column: 2; }
  .idx-row--post { grid-template-columns: minmax(0, 1fr) auto 1rem; }
  .idx-row--post .idx-name { grid-row: 1; grid-column: 1; }
  .idx-row--post .idx-date { grid-row: 1; grid-column: 2; }
  .idx-row--post .idx-mark { grid-row: 1; grid-column: 3; }
  .idx-row--post .idx-desc { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 520px) {
  .idx-row--post { grid-template-columns: minmax(0, 1fr) 1rem; }
  .idx-row--post .idx-name { grid-row: 1; grid-column: 1; }
  .idx-row--post .idx-date { grid-row: 2; grid-column: 1; text-align: start; }
  .idx-row--post .idx-desc { grid-row: 3; grid-column: 1 / -1; }
  .idx-row--post .idx-mark { grid-row: 1; grid-column: 2; }
}

@media (max-width: 720px) {
  .head-inner {
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding-block: var(--space-sm);
  }
  .site-nav { display: none; }
  .theme-toggle { margin-inline-start: auto; }
  .menu-toggle { display: grid; margin-inline-start: 0; }
  .search {
    order: 3;
    flex: 1 0 100%;
    max-width: none;
  }
  .search input { min-height: 40px; }
  .search__hint { display: none; }
  .idx-row:hover .idx-mark { opacity: 1; }
  .index-intro { padding-top: var(--space-lg); }
  .tool-shell .btn { min-height: 44px; }
  .tool-shell textarea,
  .tool-shell input[type="text"],
  .tool-shell input[type="number"],
  .tool-shell input[type="email"],
  .tool-shell input[type="password"],
  .tool-shell input[type="url"] { font-size: 16px; }
  .nav-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .colophon { padding-block: var(--space-lg); }
}

@media (max-width: 400px) {
  .wordmark__en { display: none; }
  .index-meta { gap: 0.3rem var(--space-md); }
}

@media (hover: none) {
  .idx-mark { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}