/* zer0 monochrome day / night — adapted from alpha THEME_ATELIER monochrome-day + monochrome-night */
:root,
html[data-theme="day"] {
  color-scheme: light;
  --ink: #f3f3f0;
  --paper: #fafaf8;
  --panel: #ffffff;
  --bg: var(--ink);
  --surface: var(--panel);
  --surface-hover: #efefe9;
  --text: #111111;
  --muted: #4f4f4b;
  --faint: rgba(81, 81, 76, 0.55);
  --line: rgba(16, 16, 16, 0.12);
  --line-dark: rgba(16, 16, 16, 0.22);
  --accent: #1c1c1c;
  --accent-soft: rgba(16, 16, 16, 0.08);
  --signal: #1c1c1c;
  --signal-soft: rgba(16, 16, 16, 0.06);
  --banner: #f0f0ec;
  --shell: min(1040px, calc(100vw - 28px));
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --hair: rgba(16, 16, 16, 0.14);
  --glow: rgba(16, 16, 16, 0.18);
  --glow-strong: rgba(16, 16, 16, 0.32);
  --activity-0: #ebedf0;
  --activity-1: #c6c6c1;
  --activity-2: #8e8e88;
  --activity-3: #4a4a46;
  --activity-4: #1c1c1c;
  --activity-border: rgba(16, 16, 16, 0.08);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 120ms;
  --dur: 180ms;
  --dur-slow: 260ms;
}

html[data-theme="night"] {
  color-scheme: dark;
  --ink: #030303;
  --paper: #080808;
  --panel: #101010;
  --bg: var(--ink);
  --surface: var(--panel);
  --surface-hover: #161616;
  --text: #efefec;
  --muted: #b8b8b2;
  --faint: rgba(184, 184, 178, 0.45);
  --line: rgba(235, 235, 235, 0.1);
  --line-dark: rgba(255, 255, 255, 0.18);
  --accent: #f3f3f0;
  --accent-soft: rgba(255, 255, 255, 0.1);
  --signal: #f3f3f0;
  --signal-soft: rgba(255, 255, 255, 0.08);
  --banner: #0c0c0c;
  --hair: rgba(235, 235, 235, 0.13);
  --glow: rgba(243, 243, 240, 0.22);
  --glow-strong: rgba(243, 243, 240, 0.45);
  --activity-0: #161616;
  --activity-1: #2e2e2c;
  --activity-2: #5a5a56;
  --activity-3: #a0a09a;
  --activity-4: #f3f3f0;
  --activity-border: rgba(255, 255, 255, 0.08);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 120ms;
  --dur: 180ms;
  --dur-slow: 260ms;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.45 var(--sans);
  -webkit-font-smoothing: antialiased;
  transition:
    background-color var(--dur) var(--ease-in-out),
    color var(--dur) var(--ease-in-out);
  /* Entire UI is intentionally all-lowercase. */
  text-transform: lowercase;
}
/* Trademark / product marks that must keep internal caps (zerOS). */
.tm-case {
  text-transform: none;
}
/* Middle-dot word breaks in softLabel() (audio·engine) stay subtle. */
.project-row h3,
.featured-item h3,
.project-row__path,
.featured-item__path {
  font-variant-ligatures: none;
}
/* Keep monospace inputs readable when typing URLs/ids without forced case mid-edit.
   select also none so option labels can show zerOS; softLabel lowercases the rest. */
input, textarea, select {
  text-transform: none;
}
input::placeholder {
  text-transform: lowercase;
}
button, input, select { font: inherit; }
a { color: inherit; }
::selection { background: var(--accent-soft); }

.shell { width: var(--shell); margin-inline: auto; }
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  z-index: 10;
  top: 8px;
  left: 8px;
  transform: translateY(-140%);
  padding: 6px 9px;
  border: 1px solid var(--text);
  background: var(--surface);
  font-family: var(--mono);
}
.skip-link:focus { transform: translateY(0); }

.intro {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  padding: 28px 0 18px;
  border-bottom: 1px solid var(--line-dark);
}
.intro h1 {
  margin: 0;
  font: 700 15px/1.3 var(--mono);
  letter-spacing: -0.02em;
}
.intro p { margin: 4px 0 0; color: var(--muted); }
.intro__lede {
  max-width: 54ch;
  margin-top: 8px !important;
  color: var(--text) !important;
  font: 13px/1.5 var(--sans);
}
/* Topic hub pages (static GEO discovery surfaces) */
.topic-page h1 {
  margin: 8px 0 0;
  font: 700 18px/1.3 var(--mono);
  letter-spacing: -0.02em;
}
.topic-page__count {
  margin: 10px 0 0;
  color: var(--faint);
  font: 11px/1.4 var(--mono);
}
.topic-page__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.topic-page__item {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.topic-page__item time {
  margin-left: 10px;
  color: var(--faint);
  font: 11px/1.4 var(--mono);
}
.topic-page__item p {
  margin: 4px 0 0;
  color: var(--muted);
  font: 12.5px/1.45 var(--sans);
  max-width: 70ch;
}
.topic-page__meta {
  color: var(--faint) !important;
  font: 10px/1.4 var(--mono) !important;
}
.topic-page__intents {
  margin-top: 18px;
  color: var(--faint);
  font: 11px/1.45 var(--mono);
  max-width: 70ch;
}
.topic-page__list--index li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font: 12.5px/1.45 var(--sans);
  color: var(--muted);
}
.topic-page a { color: inherit; }

.intro__quote {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  max-width: 52ch;
  margin: 12px 0 0;
  padding: 0 0 0 12px;
  border-left: 2px solid var(--line-dark);
}
.intro__quote-text {
  margin: 0;
  flex: 1 1 auto;
  color: var(--text);
  font: italic 13px/1.45 var(--sans);
}
.intro__quote-info {
  position: relative;
  flex: 0 0 auto;
  margin: 1px 0 0;
}
.intro__quote-info summary {
  list-style: none;
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--faint);
  font: 600 10px/1 var(--mono);
  text-align: center;
  cursor: pointer;
  user-select: none;
  transition:
    color var(--dur-fast) var(--ease-in-out),
    border-color var(--dur-fast) var(--ease-in-out),
    background var(--dur-fast) var(--ease-in-out),
    box-shadow var(--dur-fast) var(--ease-in-out),
    transform var(--dur-fast) var(--ease-out);
}
.intro__quote-info summary::-webkit-details-marker { display: none; }
.intro__quote-info summary:hover {
  color: var(--text);
  border-color: var(--line-dark);
  background: var(--surface-hover);
}
.intro__quote-info[open] summary {
  color: var(--text);
  border-color: var(--line-dark);
  background: var(--accent-soft);
  box-shadow: 0 0 0 3px var(--signal-soft);
}
.intro__quote-info summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.intro__quote-panel {
  position: absolute;
  z-index: 30;
  top: calc(100% + 10px);
  right: -6px;
  width: min(34ch, calc(100vw - 36px));
  padding: 12px 14px 12px;
  border: 1px solid var(--line-dark);
  border-radius: 10px;
  background: var(--panel);
  box-shadow:
    0 1px 0 color-mix(in srgb, var(--text) 6%, transparent) inset,
    0 14px 36px var(--glow),
    0 2px 8px color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--muted);
  font: 11px/1.45 var(--sans);
  animation: quote-panel-in 160ms var(--ease-out);
}
@supports (backdrop-filter: blur(10px)) {
  .intro__quote-panel {
    background: color-mix(in srgb, var(--panel) 88%, transparent);
    backdrop-filter: blur(14px) saturate(1.15);
    -webkit-backdrop-filter: blur(14px) saturate(1.15);
  }
}
/* Caret pointing at the i button */
.intro__quote-panel::before {
  content: "";
  position: absolute;
  top: -5px;
  right: 10px;
  width: 9px;
  height: 9px;
  background: var(--panel);
  border-left: 1px solid var(--line-dark);
  border-top: 1px solid var(--line-dark);
  transform: rotate(45deg);
}
.intro__quote-label {
  margin: 0 0 8px;
  color: var(--faint);
  font: 600 9px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: lowercase;
}
.intro__quote-full {
  margin: 0;
  padding: 0 0 0 10px;
  border-left: 2px solid var(--line-dark);
  color: var(--text);
  font: italic 12.5px/1.5 var(--sans);
}
.intro__quote-attr {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 5px;
  margin: 10px 0 0;
  color: var(--muted);
  font: 10px/1.45 var(--mono);
}
.intro__quote-author { color: var(--text); font-weight: 600; }
.intro__quote-sep { color: var(--faint); opacity: 0.8; }
.intro__quote-attr cite {
  font-style: italic;
  color: var(--muted);
}
.intro__quote-year { color: var(--faint); }
.intro__quote-note {
  margin: 10px 0 0;
  padding-top: 9px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font: 9.5px/1.4 var(--mono);
}
@keyframes quote-panel-in {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
@media (max-width: 520px) {
  .intro__quote-panel {
    right: auto;
    left: 50%;
    transform: translateX(-50%);
    width: min(34ch, calc(100vw - 28px));
  }
  .intro__quote-panel::before {
    right: auto;
    left: 50%;
    margin-left: -4px;
  }
  @keyframes quote-panel-in {
    from {
      opacity: 0;
      transform: translateX(-50%) translateY(-4px) scale(0.98);
    }
    to {
      opacity: 1;
      transform: translateX(-50%) translateY(0) scale(1);
    }
  }
}
.intro__body {
  max-width: 58ch;
  margin-top: 10px !important;
  color: var(--muted);
  font: 12.5px/1.5 var(--sans);
}
.intro__focus {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
  max-width: 64ch;
  margin-top: 10px;
  font: 11px/1.45 var(--mono);
}
.intro__focus-label {
  color: var(--faint);
  letter-spacing: 0.08em;
}
.intro__focus-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.intro__focus-chip {
  margin: 0;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font: 10.5px/1.3 var(--mono);
  cursor: pointer;
  transition:
    color var(--dur-fast) var(--ease-in-out),
    border-color var(--dur-fast) var(--ease-in-out),
    background var(--dur-fast) var(--ease-in-out),
    box-shadow var(--dur-fast) var(--ease-in-out);
}
.intro__focus-chip:hover {
  color: var(--text);
  border-color: var(--line-dark);
  box-shadow: 0 0 12px var(--glow);
}
.intro__focus-chip.is-active {
  color: var(--text);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.intro__meta { margin-top: 10px !important; font: 11px/1.4 var(--mono); color: var(--faint) !important; }
.about__copy {
  display: grid;
  gap: 10px;
  max-width: 720px;
}
.about__copy p {
  margin: 0;
  color: var(--muted);
  font: 12.5px/1.55 var(--sans);
}
.about__copy strong { color: var(--text); font-weight: 650; }
.about__copy code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--text);
}
.intro__company {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  font: 10px/1.2 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}
.intro__company strong {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.18em;
}
.intro__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px 14px;
  font: 12px/1.4 var(--mono);
}
.intro__links a {
  text-decoration: none;
  color: var(--muted);
  transition: color var(--dur-fast) var(--ease-in-out);
}
.intro__links a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

/* Minimal theme toggle with intentional glow */
.theme-toggle {
  position: relative;
  width: 42px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  flex: 0 0 auto;
  box-shadow:
    0 0 0 1px var(--accent-soft),
    0 0 14px var(--glow);
  transition:
    box-shadow var(--dur-slow) var(--ease-in-out),
    border-color var(--dur) var(--ease-in-out),
    background var(--dur) var(--ease-in-out),
    transform var(--dur-fast) var(--ease-out);
}
.theme-toggle:hover {
  border-color: var(--line-dark);
  box-shadow:
    0 0 0 1px var(--accent-soft),
    0 0 22px var(--glow-strong);
}
.theme-toggle:active {
  transform: scale(0.97);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.theme-toggle__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--glow-strong);
  transition:
    transform var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-in-out);
}
html[data-theme="night"] .theme-toggle__thumb {
  transform: translateX(20px);
}
.theme-toggle.is-switching {
  animation: theme-glow-pulse 420ms var(--ease-in-out);
}
@keyframes theme-glow-pulse {
  0% { box-shadow: 0 0 0 1px var(--accent-soft), 0 0 10px var(--glow); }
  45% { box-shadow: 0 0 0 1px var(--accent-soft), 0 0 28px var(--glow-strong); }
  100% { box-shadow: 0 0 0 1px var(--accent-soft), 0 0 14px var(--glow); }
}
.theme-toggle__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.featured, .archive, .about, .faq, .machine-readable, .links-panel { padding: 24px 0; }

/* Collapsed footer sections (about / faq / links) — same spirit as filter disclosure */
.section-disclosure {
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}
.section-disclosure:last-of-type {
  border-bottom: 1px solid var(--line);
}
.section-disclosure__summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 18px;
  min-height: 44px;
  padding: 12px 28px 12px 0;
  list-style: none;
  cursor: pointer;
  user-select: none;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.section-disclosure__summary::-webkit-details-marker { display: none; }
.section-disclosure__summary h2 {
  margin: 0;
  color: var(--muted);
  font: 11px/1.3 var(--mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}
.section-disclosure__summary h2 span { color: var(--faint); margin-right: 4px; }
.section-disclosure__hint {
  color: var(--faint);
  font: 10px/1.3 var(--mono);
  text-align: right;
}
.section-disclosure__summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font: 700 14px/1 var(--mono);
  transition: transform var(--dur) var(--ease-out);
}
.section-disclosure[open] > .section-disclosure__summary::after {
  content: "−";
}
.section-disclosure__summary:hover h2,
.section-disclosure[open] > .section-disclosure__summary h2 {
  color: var(--text);
}
.section-disclosure__summary:hover .section-disclosure__hint {
  color: var(--muted);
}
.section-disclosure__summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.section-disclosure__body {
  padding: 0 0 18px;
  animation: section-disclosure-in var(--dur-slow) var(--ease-out);
}
@keyframes section-disclosure-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}
.links-panel__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 28px;
  margin-top: 10px;
}
.links-panel__col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.links-panel__col h3 {
  margin: 0 0 4px;
  color: var(--faint);
  font: 10px/1.3 var(--mono);
  letter-spacing: 0.06em;
}
.links-panel__col a {
  color: var(--muted);
  font: 12px/1.4 var(--mono);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.links-panel__col a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.section-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}
.section-line h2 {
  margin: 0;
  font: 600 11px/1.3 var(--mono);
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--muted);
}
.section-line h2 span { color: var(--faint); margin-right: 4px; }
.section-line > span,
.section-line > p {
  margin: 0;
  color: var(--faint);
  font: 11px/1.3 var(--mono);
}

.featured-list { border-top: 1px solid var(--line); }
.featured-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease-in-out), padding-left var(--dur) var(--ease-out);
}
.featured-item:hover {
  background: var(--surface-hover);
  box-shadow: 8px 0 0 var(--surface-hover), -8px 0 0 var(--surface-hover);
}
.featured-item__index {
  padding-top: 1px;
  color: var(--faint);
  font: 11px/1.4 var(--mono);
  transition: color var(--dur-fast) var(--ease-in-out), transform var(--dur) var(--ease-out);
}
.featured-item:hover .featured-item__index {
  color: var(--muted);
  transform: translateX(1px);
}
.featured-item__line { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; }
.featured-item h3 { margin: 0; font: 700 14px/1.35 var(--mono); }
.featured-item h3 a {
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 1px;
  transition: background-size var(--dur) var(--ease-out), color var(--dur-fast) var(--ease-in-out);
}
.featured-item h3 a:hover {
  color: var(--accent);
  background-size: 100% 1px;
  text-decoration: none;
}
.featured-item time { flex: 0 0 auto; color: var(--faint); font: 11px/1.4 var(--mono); }
.featured-item p { max-width: 760px; margin: 4px 0 0; color: var(--muted); }
.featured-item__meta { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 7px; font: 11px/1.4 var(--mono); }
.featured-item__meta > span { color: var(--faint); }
.featured-item__meta a { color: var(--accent); text-decoration: none; }
.featured-item__meta a:hover { text-decoration: underline; text-underline-offset: 2px; }
.featured-item__path {
  margin-top: 5px;
  font: 10px/1.4 var(--mono);
  color: var(--faint);
  letter-spacing: 0.02em;
}

.activity { padding: 8px 0 14px; }
.activity__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 18px;
  margin-bottom: 8px;
  font-family: var(--mono);
  flex-wrap: wrap;
}
.activity__heading { min-width: 0; flex: 1 1 220px; }
.activity__header h3 { margin: 0; color: var(--muted); font-size: 10px; font-weight: 600; text-transform: lowercase; }
/* Mobile-only current mode label up top (desktop uses the pill selector). */
.activity__mode-label {
  display: none;
  margin: 6px 0 0;
  color: var(--text);
  font: 13px/1.25 var(--mono);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.activity__note {
  margin: 4px 0 0;
  max-width: 52ch;
  color: var(--faint);
  font: 10px/1.4 var(--mono);
}
.activity__controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  min-width: 0;
}
.activity__header #activity-selection {
  color: var(--faint);
  font-size: 10px;
  text-align: right;
  max-width: 100%;
  line-height: 1.35;
}
.activity-mode {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface);
  max-width: 100%;
}
.activity-mode__btn {
  margin: 0;
  padding: 4px 10px;
  border: 0;
  background: transparent;
  color: var(--faint);
  font: 10px/1.2 var(--mono);
  cursor: pointer;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition:
    color var(--dur-fast) var(--ease-in-out),
    background var(--dur) var(--ease-in-out),
    box-shadow var(--dur) var(--ease-in-out);
}
.activity-mode__btn + .activity-mode__btn { border-left: 1px solid var(--line); }
.activity-mode__btn:hover { color: var(--text); }
.activity-mode__btn:active { transform: translateY(0.5px); }
.activity-mode__btn.is-active {
  color: var(--text);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--hair);
}
/*
 * Activity widget: compact colored dots by default (mobile always; desktop rest).
 * Desktop hover/focus (.is-expanded) morphs dots → classic square calendar.
 */
.activity {
  --act-weeks: 52;
  --act-gap: 2px;
  --act-cell: 0; /* 0 = fluid fill */
  --act-radius: 50%;
  --act-label-w: 0px;
  --act-label-h: 0px;
  --act-label-opacity: 0;
  --act-border-w: 0px;
  --act-pad-top: 0px;
  --act-pad-left: 0px;
  transition:
    --act-gap 320ms var(--ease-out),
    --act-radius 320ms var(--ease-out),
    --act-label-w 320ms var(--ease-out),
    --act-label-h 320ms var(--ease-out),
    --act-label-opacity 240ms var(--ease-in-out),
    --act-border-w 240ms var(--ease-in-out),
    --act-pad-top 320ms var(--ease-out),
    --act-pad-left 320ms var(--ease-out);
}
.activity__viewport {
  overflow: hidden;
  padding: 4px 0 6px;
  border-radius: 8px;
  /* pan-y: vertical page scroll still works; horizontal swipes go to JS */
  touch-action: pan-y;
  -webkit-user-select: none;
  user-select: none;
  cursor: grab;
  position: relative;
  transition:
    background var(--dur) var(--ease-in-out),
    box-shadow var(--dur) var(--ease-in-out);
}
/* Dual-page track: builds | commits — swipe / mode change slides the pane */
.activity__track {
  display: flex;
  width: 200%;
  will-change: transform;
  transform: translate3d(0, 0, 0);
  transition: transform 340ms var(--ease-out);
}
.activity__track.is-dragging {
  transition: none;
}
.activity__page {
  flex: 0 0 50%;
  width: 50%;
  min-width: 0;
  box-sizing: border-box;
  padding: 0 1px;
  pointer-events: none;
}
.activity__page.is-active {
  pointer-events: auto;
}
.activity.is-expanded .activity__viewport {
  overflow-x: auto;
  scrollbar-width: thin;
  background: var(--signal-soft);
  padding: 8px 6px 10px;
}
/* Expanded calendar only shows the active page (no dual-pane chrome). */
.activity.is-expanded .activity__track {
  width: 100%;
  transform: none !important;
  transition: none;
}
.activity.is-expanded .activity__page {
  display: none;
  flex: none;
  width: 100%;
  padding: 0;
}
.activity.is-expanded .activity__page.is-active {
  display: block;
}
.activity__map {
  --activity-weeks: var(--act-weeks);
  position: relative;
  width: 100%;
  min-width: 0;
  padding: var(--act-pad-top) 0 0 var(--act-pad-left);
  transition:
    padding 320ms var(--ease-out),
    width 320ms var(--ease-out),
    min-width 320ms var(--ease-out);
}
.activity.is-expanded .activity__map {
  width: max-content;
  min-width: 100%;
}
.activity__months {
  position: absolute;
  top: 0;
  left: var(--act-pad-left);
  display: grid;
  grid-template-columns: repeat(var(--activity-weeks), minmax(0, 1fr));
  gap: var(--act-gap);
  height: var(--act-label-h);
  opacity: var(--act-label-opacity);
  color: var(--faint);
  font: 9px/1 var(--mono);
  pointer-events: none;
  transition:
    opacity 240ms var(--ease-in-out),
    height 320ms var(--ease-out),
    left 320ms var(--ease-out);
}
.activity.is-expanded .activity__months {
  grid-template-columns: repeat(var(--activity-weeks), 11px);
}
.activity__months span { white-space: nowrap; }
.activity__days {
  position: absolute;
  top: var(--act-pad-top);
  left: 0;
  display: grid;
  grid-template-rows: repeat(7, minmax(0, 1fr));
  gap: var(--act-gap);
  width: var(--act-label-w);
  height: calc(7 * 11px + 6 * 3px);
  opacity: var(--act-label-opacity);
  color: var(--faint);
  font: 8px/11px var(--mono);
  pointer-events: none;
  overflow: hidden;
  transition:
    opacity 240ms var(--ease-in-out),
    width 320ms var(--ease-out),
    top 320ms var(--ease-out);
}
.activity__days span:nth-child(1) { grid-row: 2; }
.activity__days span:nth-child(2) { grid-row: 4; }
.activity__days span:nth-child(3) { grid-row: 6; }
.activity__weeks {
  display: grid;
  grid-template-columns: repeat(var(--activity-weeks), minmax(0, 1fr));
  gap: var(--act-gap);
  width: 100%;
  transition: gap 320ms var(--ease-out);
}
.activity.is-expanded .activity__weeks {
  display: flex;
  width: max-content;
  gap: 3px;
}
.activity__week {
  display: grid;
  grid-template-rows: repeat(7, minmax(0, 1fr));
  gap: var(--act-gap);
  min-width: 0;
  transition: gap 320ms var(--ease-out);
}
.activity.is-expanded .activity__week {
  grid-template-rows: repeat(7, 11px);
  gap: 3px;
}
.activity__cell {
  width: 100%;
  aspect-ratio: 1;
  height: auto;
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: var(--act-border-w) solid var(--activity-border);
  border-radius: var(--act-radius);
  background: var(--activity-0);
  cursor: pointer;
  transform-origin: center;
  transition:
    transform 180ms var(--ease-out),
    border-radius 320ms var(--ease-out),
    border-color var(--dur-fast) var(--ease-in-out),
    border-width 240ms var(--ease-in-out),
    box-shadow var(--dur-fast) var(--ease-in-out),
    background var(--dur) var(--ease-in-out),
    width 320ms var(--ease-out),
    height 320ms var(--ease-out);
}
.activity.is-expanded .activity__cell {
  width: 11px;
  height: 11px;
  aspect-ratio: auto;
}
.activity__cell[data-level="1"] { background: var(--activity-1); }
.activity__cell[data-level="2"] { background: var(--activity-2); }
.activity__cell[data-level="3"] { background: var(--activity-3); }
.activity__cell[data-level="4"] { background: var(--activity-4); }
.activity__cell:hover {
  border-color: var(--text);
  transform: scale(1.35);
  box-shadow: 0 0 0 1px var(--accent-soft);
  z-index: 1;
}
.activity.is-expanded .activity__cell:hover { transform: scale(1.18); }
.activity__cell:active { transform: scale(1.05); }
.activity__cell.is-selected {
  outline: 1.5px solid var(--accent);
  outline-offset: 1px;
  box-shadow: 0 0 8px var(--glow);
}
.activity.is-expanded .activity__cell.is-selected {
  outline-width: 2px;
  box-shadow: 0 0 10px var(--glow);
}
.activity__cell:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Expanded chrome (desktop hover / keyboard focus) */
.activity.is-expanded {
  --act-gap: 3px;
  --act-radius: 2px;
  --act-label-w: 28px;
  --act-label-h: 14px;
  --act-label-opacity: 1;
  --act-border-w: 1px;
  --act-pad-top: 18px;
  --act-pad-left: 31px;
}

.activity__footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px 16px;
  margin-top: 4px;
  min-height: 14px;
  flex-wrap: wrap;
}
.activity__legend {
  display: flex;
  align-items: center;
  gap: 3px;
  color: var(--faint);
  font: 9px/1 var(--mono);
  flex: 0 1 auto;
  margin-top: 2px;
}
/* Quiet vanity count — intentionally faint; consistency is the real signal. */
.activity__stat {
  margin: 2px 0 0 auto;
  color: var(--faint);
  font: 9px/1.3 var(--mono);
  letter-spacing: 0.01em;
  opacity: 0.62;
  text-align: right;
  max-width: 36ch;
}
.activity__swipe-meta {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  text-align: right;
  min-width: 0;
}
.activity__mode-next {
  margin: 0;
  color: var(--muted);
  font: 9px/1.25 var(--mono);
  letter-spacing: 0.02em;
}
.activity__swipe-hint {
  margin: 0;
  color: var(--faint);
  font: 9px/1.25 var(--mono);
  letter-spacing: 0.04em;
}
.activity__legend i {
  width: 8px;
  height: 8px;
  border: 0;
  border-radius: 50%;
  background: var(--activity-0);
  transition: border-radius 320ms var(--ease-out), width 320ms var(--ease-out), height 320ms var(--ease-out);
}
.activity.is-expanded .activity__legend i {
  width: 10px;
  height: 10px;
  border: 1px solid var(--activity-border);
  border-radius: 2px;
}
.activity__legend i[data-level="1"] { background: var(--activity-1); }
.activity__legend i[data-level="2"] { background: var(--activity-2); }
.activity__legend i[data-level="3"] { background: var(--activity-3); }
.activity__legend i[data-level="4"] { background: var(--activity-4); }

/* Touch / coarse pointer: never expand — stay compact dots */
@media (hover: none), (pointer: coarse) {
  .activity.is-expanded {
    --act-gap: 2px;
    --act-radius: 50%;
    --act-label-w: 0px;
    --act-label-h: 0px;
    --act-label-opacity: 0;
    --act-border-w: 0px;
    --act-pad-top: 0px;
    --act-pad-left: 0px;
  }
  .activity.is-expanded .activity__viewport {
    overflow: hidden;
    background: transparent;
    padding: 4px 0 6px;
  }
  .activity.is-expanded .activity__map {
    width: 100%;
    min-width: 0;
  }
  .activity.is-expanded .activity__weeks {
    display: grid;
    width: 100%;
    gap: var(--act-gap);
  }
  .activity.is-expanded .activity__week {
    grid-template-rows: repeat(7, minmax(0, 1fr));
    gap: var(--act-gap);
  }
  .activity.is-expanded .activity__cell {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
  }
  .activity.is-expanded .activity__legend i {
    width: 8px;
    height: 8px;
    border: 0;
    border-radius: 50%;
  }
}

.filter-disclosure {
  margin: 0 0 4px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-dark);
}
.filter-disclosure summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 36px;
  padding: 7px 26px 7px 0;
  color: var(--muted);
  font: 11px/1.4 var(--mono);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.filter-disclosure summary::-webkit-details-marker { display: none; }
.filter-disclosure summary::after {
  content: "+";
  position: absolute;
  right: 1px;
  color: var(--accent);
  font: 700 14px/1 var(--mono);
  transition: transform var(--dur) var(--ease-out), opacity var(--dur-fast) linear;
}
.filter-disclosure[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}
.filter-disclosure summary:hover { color: var(--accent); }
.filter-disclosure summary > span:last-child { color: var(--faint); }
.filter-disclosure[open] summary { border-bottom: 1px solid var(--line); }

.filters {
  display: grid;
  grid-template-columns: minmax(200px, 1.6fr) repeat(5, minmax(96px, 0.7fr)) auto;
  align-items: end;
  gap: 7px;
  padding: 10px 0;
  animation: filter-panel-in var(--dur-slow) var(--ease-out);
}
@keyframes filter-panel-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.filter { position: relative; display: grid; gap: 3px; min-width: 0; }
.filter > span { color: var(--faint); font: 10px/1.2 var(--mono); text-transform: lowercase; }
.filter input, .filter select {
  width: 100%;
  height: 31px;
  min-width: 0;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface);
  color: var(--text);
  font: 12px/1 var(--mono);
  transition:
    border-color var(--dur-fast) var(--ease-in-out),
    box-shadow var(--dur-fast) var(--ease-in-out),
    background var(--dur) var(--ease-in-out);
}
.filter input:hover, .filter select:hover { border-color: var(--line-dark); }
.filter input:focus, .filter select:focus {
  border-color: var(--accent);
  outline: 2px solid var(--accent-soft);
  outline-offset: 0;
  box-shadow: 0 0 0 1px var(--accent-soft);
}
.filter--search input { padding-right: 34px; }
.filter kbd {
  position: absolute;
  right: 7px;
  bottom: 6px;
  min-width: 18px;
  padding: 1px 4px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--faint);
  background: var(--bg);
  font: 10px/1.4 var(--mono);
  text-align: center;
}
.filter-actions { display: flex; gap: 5px; }
.filter-actions button, .empty-state button {
  height: 31px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  font: 11px/1 var(--mono);
  transition:
    border-color var(--dur-fast) var(--ease-in-out),
    color var(--dur-fast) var(--ease-in-out),
    background var(--dur-fast) var(--ease-in-out),
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-in-out);
}
.filter-actions button:hover, .empty-state button:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--glow);
}
.filter-actions button:active, .empty-state button:active {
  transform: translateY(1px);
}
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.list-head, .project-row {
  display: grid;
  grid-template-columns: 98px minmax(0, 1fr) minmax(150px, 220px);
  gap: 14px;
}
.list-head {
  padding: 8px 0 5px;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font: 10px/1.3 var(--mono);
}
.project-row {
  align-items: start;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  transition:
    background var(--dur) var(--ease-in-out),
    opacity var(--dur) var(--ease-in-out),
    transform var(--dur) var(--ease-out);
}
.project-row.is-enter {
  animation: row-enter var(--dur-slow) var(--ease-out) both;
}
@keyframes row-enter {
  from {
    opacity: 0;
    transform: translateY(3px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.project-row:hover {
  background: var(--surface-hover);
  box-shadow: 8px 0 0 var(--surface-hover), -8px 0 0 var(--surface-hover);
}
.project-row time {
  padding-top: 2px;
  color: var(--faint);
  font: 11px/1.4 var(--mono);
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.project-row:hover time { color: var(--muted); }
.project-row h3 { margin: 0; font: 650 13px/1.4 var(--mono); }
.project-row h3 a {
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 1px;
  transition:
    color var(--dur-fast) var(--ease-in-out),
    background-size var(--dur) var(--ease-out);
}
.project-row h3 a span {
  color: var(--faint);
  font-weight: 400;
  display: inline-block;
  transition: transform var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-in-out);
}
.project-row h3 a:hover {
  color: var(--accent);
  background-size: 100% 1px;
  text-decoration: none;
}
.project-row h3 a:hover span {
  color: var(--accent);
  transform: translate(1px, -1px);
}
.project-row p { margin: 2px 0 0; color: var(--muted); font-size: 12px; line-height: 1.42; }
.project-row__path {
  margin-top: 4px;
  font: 10px/1.4 var(--mono);
  color: var(--faint);
  letter-spacing: 0.01em;
}
.project-row__path button {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.project-row__path button:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.project-row__path .sep { margin: 0 5px; opacity: 0.55; }
.project-row__links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  margin-top: 4px;
  font: 10.5px/1.4 var(--mono);
}
.project-row__links a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-in-out);
}
.project-row__links a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
  opacity: 0.88;
}
.project-row__tags { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 3px 8px; padding-top: 1px; font: 10.5px/1.5 var(--mono); }
.project-row__tags button,
.project-row__tags a {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--faint);
  cursor: pointer;
  text-decoration: none;
  font: inherit;
  transition: color var(--dur-fast) var(--ease-in-out);
}
.project-row__tags button:hover,
.project-row__tags a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.project-row__tags .type-tag { color: var(--muted); }

.empty-state { padding: 28px 0; color: var(--muted); text-align: center; }
.empty-state p { margin: 0 0 10px; }

.about p, .faq p, .machine-readable p { max-width: 720px; margin: 0; color: var(--muted); }

.faq__list {
  display: grid;
  gap: 14px;
  max-width: 720px;
}
.faq__item h3 {
  margin: 0 0 4px;
  font: 600 12.5px/1.4 var(--sans);
  color: var(--text);
  letter-spacing: 0.01em;
}
.faq__item p {
  font: 12.5px/1.55 var(--sans);
}
.machine-readable__links { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 8px; font: 11px/1.5 var(--mono); }
.machine-readable__links a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-in-out);
}
.machine-readable__links a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
  opacity: 0.88;
}

footer.shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 18px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font: 11px/1.4 var(--mono);
}
footer.shell a {
  text-decoration: none;
  color: var(--muted);
  transition: color var(--dur-fast) var(--ease-in-out);
}
footer.shell a:hover { color: var(--accent); }

/* Micro-interactions: mechanical, no bounce (zer0 motion grammar). */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .activity__cell:hover,
  .activity__cell:active {
    transform: none;
  }
  .theme-toggle:active,
  .filter-actions button:active,
  .empty-state button:active {
    transform: none;
  }
}

.noscript {
  width: var(--shell);
  margin: 0 auto 24px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  color: var(--muted);
  font: 12px/1.4 var(--mono);
}

@media (max-width: 900px) {
  .filters { grid-template-columns: 1fr 1fr; }
  .filter--search { grid-column: 1 / -1; }
  .filter-actions { grid-column: 1 / -1; }
  .list-head, .project-row { grid-template-columns: 86px minmax(0, 1fr); }
  .list-head span:last-child,
  .project-row__tags { grid-column: 2; justify-content: flex-start; margin-top: -5px; }
}
@media (max-width: 640px) {
  :root,
  html[data-theme="day"],
  html[data-theme="night"] {
    --shell: min(1040px, calc(100vw - 20px));
  }

  .intro { flex-direction: column; gap: 12px; padding: 18px 0 12px; }
  .intro__links {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px 12px;
  }
  .intro__focus-chip {
    font-size: 10px;
    padding: 4px 8px;
  }
  .featured, .archive, .about, .faq, .machine-readable, .links-panel { padding: 16px 0; }
  .section-disclosure__summary { min-height: 40px; padding: 10px 26px 10px 0; }
  .section-disclosure__summary h2 { font-size: 10px; }
  .section-disclosure__hint { font-size: 9px; max-width: 42vw; }
  .links-panel__grid { grid-template-columns: 1fr; gap: 16px; }
  .section-line {
    gap: 10px;
    margin-bottom: 8px;
  }
  .section-line h2 { font-size: 10px; }
  .section-line > span,
  .section-line > p { font-size: 10px; }

  /* Featured: title + date stack cleanly; meta stays one horizontal band when possible */
  .featured-item {
    grid-template-columns: 22px minmax(0, 1fr);
    gap: 6px 10px;
    padding: 12px 0;
  }
  .featured-item__line {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 2px 10px;
  }
  .featured-item h3 { font-size: 13px; }
  .featured-item time {
    display: inline;
    margin-top: 0;
    font-size: 10px;
  }
  .featured-item p { font-size: 12px; line-height: 1.4; }
  .featured-item__meta {
    gap: 4px 8px;
    margin-top: 6px;
    font-size: 10px;
  }
  .featured-item__path { font-size: 9px; }

  .filters { grid-template-columns: 1fr; }

  /*
   * Archive rows (mobile):
   *  date ………………… #dev [ts] [fork]   ← one meta row
   *  title
   *  description
   *  path / links
   */
  .list-head { display: none; } /* column headers are noise on phone */
  .project-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "date tags"
      "main main";
    column-gap: 8px;
    row-gap: 3px;
    padding: 11px 0;
    align-items: baseline;
  }
  .project-row time {
    grid-area: date;
    padding-top: 0;
    font-size: 10px;
    line-height: 1.3;
  }
  .project-row__tags {
    grid-area: tags;
    grid-column: auto;
    justify-content: flex-end;
    align-items: center;
    margin-top: 0;
    padding-top: 0;
    gap: 2px 5px;
    font: 9px/1.2 var(--mono);
    flex-wrap: nowrap;
    max-width: min(58vw, 220px);
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    mask-image: linear-gradient(90deg, #000 88%, transparent);
  }
  .project-row__tags::-webkit-scrollbar { display: none; }
  .project-row__tags button,
  .project-row__tags a,
  .project-row__tags .type-tag {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 0;
  }
  .project-row__main {
    grid-area: main;
    min-width: 0;
  }
  .project-row h3 { font-size: 13px; line-height: 1.35; }
  .project-row p {
    margin-top: 3px;
    font-size: 11.5px;
    line-height: 1.4;
  }
  .project-row__path {
    margin-top: 4px;
    font-size: 9px;
  }
  .project-row__links {
    margin-top: 4px;
    gap: 6px 10px;
    font-size: 10px;
  }

  footer.shell {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  /* Activity: compact header, mode once, swipe affordance under graph */
  .activity { padding: 8px 0 14px; }
  .activity__header {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 4px 12px;
    margin-bottom: 8px;
  }
  .activity__heading { flex: 1 1 auto; min-width: 0; }
  .activity__header h3 {
    display: inline;
    margin-right: 8px;
  }
  .activity__mode-label {
    display: inline;
    margin: 0;
    font-size: 12px;
    font-weight: 600;
  }
  .activity__note { display: none; }
  .activity__controls {
    flex: 1 1 100%;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }
  .activity-mode { display: none; }
  /* Stats only — mode name lives in the label above (avoid “build log” twice) */
  .activity__header #activity-selection {
    text-align: left;
    font-size: 9px;
    line-height: 1.35;
  }
  .activity__viewport {
    padding: 6px 0 8px;
    touch-action: pan-y;
  }
  .activity__footer {
    margin-top: 6px;
    align-items: flex-start;
    justify-content: space-between;
  }
  .activity__stat {
    order: 3;
    flex: 1 1 100%;
    margin: 4px 0 0;
    text-align: left;
    opacity: 0.55;
    font-size: 8px;
    max-width: none;
  }
  .activity__swipe-meta { display: flex; }
  .activity__mode-next,
  .activity__swipe-hint { font-size: 9px; }
  .activity { --act-gap: 2.5px; }
  .activity__cell { touch-action: none; }
}