/* STUDself — V4 Studboards visual alignment
   Same tokens, geometry, and component grammar as STUDresearch so the two
   products read as one experience. Dark-first; loads last so these rules win
   under body.stud-v3.v4 against the shared chrome static CSS. */

:root {
  --ink: #f7f8f4;
  --ink-muted: #9aa5b1;
  --ink-faint: #8491a1;
  --paper: #05070a;
  --paper-elevated: #0c1117;
  --paper-card: #10161e;
  --rule: rgba(255, 255, 255, 0.1);
  --rule-strong: rgba(255, 255, 255, 0.18);
  --signal: #c8f53f;
  --signal-soft: rgba(200, 245, 63, 0.14);
  --signal-ink: #101503;
  --peptide: #45dbf7;
  --caution: #ff8a7a;
  --disclaimer-bg: rgba(5, 7, 10, 0.96);
  --disclaimer-fg: #9aa5b1;
  --focus: #c8f53f;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.48);
  --glow-lime: 0 0 24px rgba(200, 245, 63, 0.22);
  --font-display: "Avenir Next", Avenir, "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-ui: "Avenir Next", Avenir, "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Roboto Mono", ui-monospace, Menlo, monospace;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --touch: 44px;
  --v4-max: 1240px;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

/* —— Shared site shell integration ——
   The masthead reuses the site's shared chrome assets; those scope their page
   theme off body.stud-v3.v4, so the rules below re-assert the STUDself product
   theme under the same scope. This file loads last, so these win. */
body.stud-v3.v4 {
  min-height: 100vh;
  background: var(--paper) !important;
  background-image:
    radial-gradient(ellipse 90% 50% at 50% -10%, rgba(200, 245, 63, 0.06), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(160, 107, 255, 0.05), transparent 50%) !important;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.45;
}

.site-header a,
.shell-mobile-nav-static a {
  text-decoration: none;
}

/* Owner-selected sticky stack (same as Research): masthead + disclaimer + A-Z.
   The shared menu stays above those layers and below the topic sheet (z-90). */
body.stud-v3.v4 > .site-header.site-header--open-wall {
  position: sticky !important;
  top: 0 !important;
  z-index: 70;
}

::selection {
  background: color-mix(in srgb, var(--signal) 35%, transparent);
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

a {
  color: var(--peptide);
}

a:hover {
  color: var(--signal);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 0.75rem;
  background: var(--signal);
  color: var(--signal-ink);
  font-weight: 700;
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* —— Disclaimer strip —— */
.disclaimer-top {
  position: sticky;
  top: var(--site-header-h, 70px);
  z-index: 65;
  background: var(--disclaimer-bg);
  color: var(--disclaimer-fg);
  padding: 0.55rem 1rem;
  text-align: center;
  font-size: 0.78rem;
  line-height: 1.35;
  letter-spacing: 0.01em;
  border-bottom: 1px solid var(--rule);
}

/* —— Self identity + command area. It deliberately scrolls away. —— */
.self-command {
  position: relative;
  z-index: 1;
  background:
    radial-gradient(circle at 12% 0%, rgba(200, 245, 63, 0.1), transparent 34%),
    radial-gradient(circle at 88% 10%, rgba(160, 107, 255, 0.09), transparent 32%),
    linear-gradient(180deg, rgba(12, 17, 23, 0.98), rgba(5, 7, 10, 0.98));
  border-bottom: 1px solid var(--rule-strong);
  overflow: hidden;
}

.self-command-inner {
  width: min(calc(100% - 2rem), 1180px);
  margin: 0 auto;
  padding: 1.15rem 0 1.05rem;
}

.self-identity {
  display: grid;
  gap: 0.38rem;
  min-width: 0;
  margin-bottom: 0.95rem;
}

.self-kicker,
.section-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

.self-kicker {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.self-kicker > span {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px var(--signal-soft), 0 0 18px rgba(200, 245, 63, 0.35);
}

.self-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.85rem;
}

.brand {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 850;
  letter-spacing: -0.045em;
  margin: 0;
  line-height: 1;
  color: var(--ink);
}

.brand-stud {
  letter-spacing: 0.04em;
  font-weight: 800;
  color: var(--signal);
  text-shadow: 0 0 18px rgba(200, 245, 63, 0.25);
}

.self-lead {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 650;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.self-guardrails {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.self-guardrails span {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  padding: 0.2rem 0.58rem;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.045);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 650;
  letter-spacing: 0.045em;
  color: var(--ink-muted);
}

.self-guardrails span:first-child {
  border-color: color-mix(in srgb, var(--caution) 42%, var(--rule));
  color: color-mix(in srgb, var(--caution) 78%, var(--ink));
}

/* Search row — same contract as Research: search + Browse + Clear */
.search-row {
  display: flex;
  gap: 0.4rem;
  align-items: stretch;
}

.self-command .btn-ghost {
  min-height: 2.75rem;
  padding: 0 0.75rem;
  font-size: 0.72rem;
}

.self-command .search-wrap input {
  min-height: 2.75rem;
  font-size: 0.95rem;
}

.search-wrap {
  flex: 1;
  position: relative;
}

.search-wrap input {
  width: 100%;
  min-height: var(--touch);
  padding: 0.55rem 2.5rem 0.55rem 0.85rem;
  border: 1px solid var(--rule);
  background: var(--paper-elevated);
  border-radius: var(--radius-sm);
  outline: none;
}

.search-wrap input:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--signal) 35%, transparent);
}

.search-clear {
  position: absolute;
  right: 0.35rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  color: var(--ink-muted);
  font-size: 1.2rem;
  line-height: 1;
  display: grid;
  place-items: center;
}

.search-clear:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--rule) 40%, transparent);
}

.btn-ghost {
  min-height: var(--touch);
  padding: 0 0.85rem;
  border: 1px solid var(--rule);
  background: var(--paper-elevated);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.btn-ghost[aria-pressed="true"],
.btn-ghost.is-active {
  border-color: color-mix(in srgb, var(--signal) 55%, var(--rule));
  background: var(--signal-soft);
  color: var(--signal);
  box-shadow: var(--glow-lime);
}

.active-filters {
  margin: 0.25rem 0 0;
}

.active-filters:empty {
  display: none;
}

.active-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 1.85rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--signal);
  border-radius: 999px;
  background: color-mix(in srgb, var(--signal-soft) 35%, var(--paper-elevated));
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink);
}

/* —— Browse panel — hidden by default so the list leads —— */
.chrome-flow {
  padding: 0.4rem 0 0.35rem;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.chrome-flow[hidden] {
  display: none !important;
}

.value-line {
  margin: 0 1rem 0.35rem;
  font-size: 0.8rem;
  line-height: 1.3;
  color: var(--ink-muted);
  max-width: 42rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.value-line strong {
  color: var(--ink);
  font-weight: 650;
}

/* Hot searches — one horizontal strip, never a chip wall */
.hot-searches {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.3rem;
  margin: 0.15rem 0;
  padding: 0 1rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.hot-chip {
  flex: 0 0 auto;
  min-height: 1.65rem;
  padding: 0.12rem 0.5rem;
  border: 1px dashed var(--rule);
  border-radius: 999px;
  background: transparent;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--ink-muted);
  white-space: nowrap;
}

.hot-chip:hover {
  border-color: var(--signal);
  color: var(--ink);
}

/* Topic families — one horizontal strip, quick-filter grammar */
.family-filters {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.3rem;
  margin: 0.15rem 0 0.25rem;
  padding: 0 1rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.family-chip {
  flex: 0 0 auto;
  min-height: 1.85rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-elevated);
  font-size: 0.74rem;
  line-height: 1.2;
  color: var(--ink);
  white-space: nowrap;
}

.family-chip small {
  opacity: 0.62;
  font-size: 0.85em;
}

.family-chip.is-on,
.family-chip[aria-pressed="true"] {
  border-color: var(--signal);
  background: color-mix(in srgb, var(--signal) 18%, var(--paper-elevated));
  font-weight: 600;
}

.family-intro {
  margin: 0.35rem 1rem 0.5rem;
  padding: 0.55rem 0.75rem;
  border-left: 3px solid var(--signal);
  background: var(--paper-elevated);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.family-intro[hidden] {
  display: none !important;
}

.family-intro p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.86rem;
  line-height: 1.4;
}

.family-ask {
  color: var(--ink) !important;
  font-weight: 750;
  margin-bottom: 0.2rem !important;
}

/* Key / legend */
.legend {
  margin: 0.25rem 1rem 0.5rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--paper-elevated);
}

.legend-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 2rem;
  padding: 0.3rem 0.65rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.legend-body {
  display: none;
  padding: 0 0.85rem 0.85rem;
  font-size: 0.86rem;
  color: var(--ink);
  border-top: 1px solid var(--rule);
}

.legend.is-open .legend-body {
  display: block;
}

.legend-body ul {
  margin: 0.55rem 0 0;
  padding-left: 1.1rem;
}

.legend-body li {
  margin-bottom: 0.35rem;
}

/* —— Layout: sticky A-Z bar, most-discussed board, then canonical directory —— */
.workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 0 0 4rem;
}

.az-rail {
  display: flex;
  gap: 0.12rem;
  overflow-x: auto;
  padding: 0.3rem 0.7rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper-elevated) 94%, transparent);
  position: sticky;
  top: calc(var(--site-header-h, 70px) + var(--disclaimer-h, 2.35rem));
  z-index: 60;
  scrollbar-width: none;
  backdrop-filter: blur(22px) saturate(1.35);
  -webkit-backdrop-filter: blur(22px) saturate(1.35);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.az-rail::-webkit-scrollbar {
  display: none;
}

body.sheet-open .az-rail {
  visibility: hidden;
}

.az-btn {
  flex: 0 0 auto;
  min-width: 2rem;
  min-height: 2rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  border: 1px solid transparent;
  border-radius: 10px;
}

.az-btn:hover,
.az-btn:focus-visible {
  color: var(--ink);
  border-color: var(--rule);
}

.az-btn.is-active,
.az-btn[aria-pressed="true"] {
  color: var(--ink);
  border-color: var(--signal);
  background: color-mix(in srgb, var(--signal-soft) 55%, var(--paper-elevated));
  font-weight: 700;
}

.az-btn:disabled {
  opacity: 0.28;
  cursor: default;
}

.az-btn--top {
  font-size: 0.8rem;
}

.letter-heading {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--signal-soft) 28%, var(--paper));
  font-size: 0.88rem;
  color: var(--ink-muted);
  /* Leave room under the exact three-layer sticky stack when jumping. */
  scroll-margin-top: calc(
    var(--site-header-h, 70px) + var(--disclaimer-h, 2.35rem) + 3rem
  );
}

.letter-heading-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--paper-elevated);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
}

.letter-heading-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink);
}

.main-col {
  min-width: 0;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.8rem 1.25rem;
}

.section-head > div {
  min-width: 0;
}

.section-head h2 {
  margin: 0.28rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4vw, 2.35rem);
  font-weight: 820;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.section-head p:not(.section-kicker) {
  max-width: 46rem;
  margin: 0.5rem 0 0;
  color: var(--ink-muted);
  line-height: 1.48;
}

.popular-section {
  padding: 2rem 0 2.2rem;
  border-bottom: 1px solid var(--rule-strong);
  background:
    linear-gradient(180deg, rgba(160, 107, 255, 0.035), transparent 45%),
    var(--paper);
}

.popular-section-head,
.directory-section-head {
  padding: 0 1rem;
}

.popular-count,
.directory-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: var(--paper-elevated);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  white-space: nowrap;
}

.popular-count {
  border-color: color-mix(in srgb, var(--signal) 38%, var(--rule));
  color: var(--signal);
  background: color-mix(in srgb, var(--signal-soft) 38%, var(--paper-elevated));
}

.popular-grid {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(17rem, 82vw);
  gap: 0.75rem;
  margin-top: 1rem;
  padding: 0.15rem 1rem 0.6rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 1rem;
  scrollbar-width: thin;
  overscroll-behavior-inline: contain;
}

/* Most-discussed tile — same card grammar as Research's popular card.
   Class name stays .topic-tile (display-proof contract). */
.topic-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 13.5rem;
  padding: 0.9rem;
  overflow: hidden;
  text-align: left;
  color: var(--ink);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 100% 0%, rgba(160, 107, 255, 0.12), transparent 42%),
    linear-gradient(150deg, var(--paper-card), var(--paper-elevated));
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.28);
  scroll-snap-align: start;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.topic-tile::after {
  position: absolute;
  right: -0.15rem;
  bottom: -1.2rem;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(160, 107, 255, 0.12), transparent 68%);
  content: "";
  pointer-events: none;
}

.topic-tile--lead {
  border-color: color-mix(in srgb, var(--signal) 44%, var(--rule));
  background:
    radial-gradient(circle at 100% 0%, rgba(200, 245, 63, 0.15), transparent 44%),
    linear-gradient(150deg, var(--paper-card), var(--paper-elevated));
}

.topic-tile:hover,
.topic-tile:focus-visible {
  border-color: color-mix(in srgb, var(--signal) 65%, var(--rule));
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.36), var(--glow-lime);
  transform: translateY(-3px);
}

.tile-top,
.tile-foot {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.tile-rank {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 850;
  letter-spacing: -0.04em;
  color: var(--signal);
}

.tile-signal {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 650;
  color: var(--ink-muted);
}

.tile-signal i {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-soft);
}

.tile-name {
  position: relative;
  z-index: 1;
  display: block;
  margin-top: 1rem;
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  overflow-wrap: anywhere;
}

.tile-blurb {
  position: relative;
  z-index: 1;
  display: -webkit-box;
  margin-top: 0.55rem;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  color: var(--ink-muted);
  font-size: 0.8rem;
  line-height: 1.42;
}

.tile-foot {
  margin-top: auto;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule);
}

.tile-foot > span:last-child {
  font-size: 0.68rem;
  font-weight: 750;
  color: var(--ink);
  white-space: nowrap;
}

.tile-foot b {
  color: var(--signal);
}

.directory-section {
  padding-top: 2rem;
  background: var(--paper);
}

.directory-section-head {
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule-strong);
}

/* —— Ledger rows —— */
.ledger {
  margin: 0;
  padding: 0;
}

.ledger-row-wrap {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: 1px solid var(--rule);
}

.ledger-row-wrap .ledger-row {
  border-bottom: none;
}

.ledger-row {
  display: grid;
  grid-template-columns: 5px 1fr auto;
  gap: 0.65rem 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.75rem 0.55rem 0.75rem 0.9rem;
  min-height: 56px;
  border-bottom: 1px solid var(--rule);
  background: transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.ledger-row:hover,
.ledger-row:focus-visible {
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--signal) 10%, transparent),
    color-mix(in srgb, var(--paper-elevated) 70%, transparent)
  );
  border-color: color-mix(in srgb, var(--signal) 28%, var(--rule));
}

.ledger-row .spine {
  width: 5px;
  border-radius: 1px;
  background: color-mix(in srgb, var(--ink) 25%, transparent);
  align-self: stretch;
}

.ledger-row .spine.high {
  background: var(--signal);
}

.ledger-row .spine.medium {
  background: color-mix(in srgb, var(--signal) 55%, transparent);
}

.ledger-row .spine.emerging {
  background: color-mix(in srgb, var(--ink) 28%, transparent);
}

.row-main {
  min-width: 0;
}

.row-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.5rem;
  margin-bottom: 0.15rem;
}

.row-name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.25;
}

.type-pill {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.1rem 0.38rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-muted);
}

/* Spoken one-liner — why people look it up */
.row-blurb {
  display: block;
  margin: 0.2rem 0 0.25rem;
  padding: 0.28rem 0.5rem;
  font-size: 0.86rem;
  line-height: 1.32;
  font-weight: 600;
  color: var(--ink);
  background: color-mix(in srgb, var(--signal-soft) 22%, var(--paper-elevated));
  border-left: 3px solid var(--signal);
  border-radius: 0 3px 3px 0;
}

.row-signal {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
  align-self: center;
  white-space: nowrap;
  max-width: 5.8rem;
  text-align: right;
  line-height: 1.2;
}

.row-signal-dot {
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--ink) 28%, transparent);
}

.row-signal-dot.high {
  background: var(--signal);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--signal) 25%, transparent);
}

.row-signal-dot.medium {
  background: color-mix(in srgb, var(--signal) 60%, transparent);
}

.row-signal-dot.emerging {
  background: color-mix(in srgb, var(--ink) 30%, transparent);
}

/* —— Empty state —— */
.empty-state {
  padding: 2.5rem 1.25rem;
  text-align: center;
  color: var(--ink-muted);
}

.empty-state strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.empty-state p {
  margin: 0.35rem 0 0.75rem;
  font-size: 0.9rem;
  line-height: 1.4;
}

.empty-suggest-k {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 1rem 0 0.4rem !important;
}

.empty-suggest {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.empty-link {
  min-height: 2.1rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-elevated);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}

.empty-link:hover {
  border-color: var(--signal);
}

/* —— Topic sheet — full-viewport content, minimal locked chrome —— */
.sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 21, 26, 0.5);
  z-index: 80;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.sheet-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.sheet {
  position: fixed;
  z-index: 90;
  left: 0;
  right: 0;
  bottom: 0;
  /* Near-full screen on mobile so content is readable */
  height: min(96dvh, 100%);
  max-height: min(96dvh, 100%);
  background: linear-gradient(165deg, var(--paper-card), var(--paper-elevated) 45%, var(--paper));
  border: 1px solid var(--rule-strong);
  border-bottom: none;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: var(--shadow), var(--glow-lime);
  display: flex;
  flex-direction: column;
  transform: translateY(105%);
  transition: transform 0.22s ease-out;
  outline: none;
  overflow: hidden;
}

.sheet.open {
  transform: translateY(0);
}

/* Locked bar: title/family/talk + close */
.sheet-bar {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem 0.55rem;
  border-bottom: 1px solid var(--rule);
  background: rgba(8, 11, 16, 0.92);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  z-index: 3;
}

.sheet-bar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-width: 0;
}

.sheet-bar-text {
  min-width: 0;
  flex: 1;
}

.sheet-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.15;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sheet-type-line {
  margin: 0.1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sheet-close {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--ink-muted);
  display: grid;
  place-items: center;
}

.sheet-close:hover {
  color: var(--ink);
  border-color: var(--rule-strong);
}

/* Single scroll region = nearly full sheet (only thin bar is locked) */
.sheet-scroll {
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding-bottom: max(1.5rem, env(safe-area-inset-bottom, 0));
}

.sheet-intro {
  padding: 0.55rem 1rem 0.35rem;
  border-bottom: 1px solid var(--rule);
  /* Must not create a nested scroll or sticky lock */
  position: static;
  overflow: visible;
}

.sheet-aliases {
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin: 0 0 0.45rem;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sheet-aliases:empty {
  display: none;
}

.sheet-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.55rem;
}

.meta-chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--paper);
}

.meta-chip.signal-high {
  border-color: var(--signal);
  color: color-mix(in srgb, var(--signal) 80%, var(--ink));
}

.sheet-jump {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.15rem 0 0.85rem;
  padding: 0.7rem 0 0.15rem;
  border-top: 1px solid var(--rule-strong);
}

.sheet-jump[hidden] {
  display: none !important;
}

.notes-kicker {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.notes-jumps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
}

.jump-btn {
  min-height: 1.95rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-elevated);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink);
}

.jump-btn:hover,
.jump-btn:focus-visible {
  border-color: var(--signal);
  background: color-mix(in srgb, var(--signal-soft) 35%, var(--paper-elevated));
  outline: none;
}

.jump-btn.is-caution {
  border-color: color-mix(in srgb, var(--caution) 45%, var(--rule));
  color: var(--caution);
}

.sheet-disclaimer {
  font-size: max(12.5px, 0.8125rem);
  color: var(--ink-muted);
  border-left: 3px solid var(--signal);
  padding: 0.3rem 0.5rem;
  background: color-mix(in srgb, var(--paper) 70%, transparent);
  margin: 0 0 0.45rem;
  line-height: 1.35;
}

/* Body is NOT a nested scroller — parent .sheet-scroll owns scroll */
.sheet-body {
  flex: none;
  overflow: visible;
  padding: 0.15rem 1rem 2.5rem;
}

.sheet-loading,
.sheet-error {
  padding: 2rem 0.5rem;
  text-align: center;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Spoken first line — leads the card, locked */
.sheet-first {
  margin: 0.75rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--ink);
}

/* The common picture — short easy snapshot rows (amount, then why) */
.cut-list {
  display: grid;
  gap: 0.55rem;
  margin: 0.9rem 0;
}

.cut-k {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-family: var(--font-mono);
}

.cut {
  display: grid;
  gap: 0.15rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--paper);
}

.cut-lead {
  font-weight: 800;
  font-size: 1.02rem;
}

.cut-v {
  color: var(--ink-muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

/* One short Good to know — stays compact, not the focus */
.sheet-watch {
  margin: 0.9rem 0 1rem;
  padding: 0.55rem 0.7rem;
  border-left: 3px solid var(--signal);
  background: color-mix(in srgb, var(--signal-soft) 18%, var(--paper-elevated));
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
  line-height: 1.4;
  color: var(--ink-muted);
}

.sheet-watch strong {
  color: var(--ink);
  font-weight: 750;
}

/* Notes sections — open, scannable, jump-chip targets */
.section {
  margin: 0 0 0.6rem;
  padding: 0.5rem 0.55rem 0.6rem;
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: 0.5rem;
}

.section.open {
  background: color-mix(in srgb, var(--paper-elevated) 70%, transparent);
  border-radius: 8px;
  border-bottom-color: transparent;
}

.sec-title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.sec-title.caution {
  color: var(--caution);
}

.note-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.note-list li {
  position: relative;
  padding: 0.35rem 0.35rem 0.35rem 0.75rem;
  font-size: 0.9rem;
  line-height: 1.38;
  border-left: 3px solid var(--signal);
  margin-bottom: 0.28rem;
  border-radius: 0 3px 3px 0;
  background: color-mix(in srgb, var(--signal-soft) 12%, transparent);
}

.note-list strong {
  color: var(--ink);
}

.section[data-sec="watchForLong"] .note-list li {
  border-left-color: color-mix(in srgb, var(--caution) 55%, var(--rule));
  background: color-mix(in srgb, var(--caution) 6%, transparent);
}

.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.related-list button,
.pointer-link {
  display: inline-flex;
  align-items: center;
  min-height: 1.95rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper-elevated);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--signal);
  text-decoration: none;
}

.related-list button:hover,
.pointer-link:hover {
  border-color: var(--signal);
  background: color-mix(in srgb, var(--signal-soft) 35%, var(--paper-elevated));
  color: var(--signal);
}

.open-pointers {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.open-note {
  margin: 0.55rem 0 0;
  color: var(--ink-muted);
  font-size: 0.84rem;
  line-height: 1.4;
}

/* —— Footer disclaimer —— */
.disclaimer-bottom {
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.35)), var(--disclaimer-bg);
  color: var(--disclaimer-fg);
  padding: 2rem 1.25rem 3rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.disclaimer-bottom-inner {
  max-width: 1040px;
  margin: 0 auto;
}

.disclaimer-bottom .site-disclaimer {
  max-width: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.disclaimer-bottom .site-disclaimer::before {
  display: none;
}

.disclaimer-bottom h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 0.75rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.disclaimer-bottom .disclaimer-label {
  font-weight: 800;
  color: var(--signal);
  letter-spacing: 0.02em;
  margin-right: 0.25rem;
}

.disclaimer-bottom strong {
  color: var(--ink);
}

.disclaimer-bottom p {
  font-size: max(13px, 0.9rem);
  line-height: 1.55;
  color: var(--ink-muted);
  margin: 0 0 0.75rem;
}

body.stud-v3.v4 .disclaimer-bottom .site-disclaimer.site-disclaimer--portfolio .site-disclaimer__copy {
  font-size: 13px !important;
  line-height: 1.55 !important;
}

.disclaimer-bottom a {
  color: var(--signal);
  text-decoration: none;
  font-weight: 600;
}

.disclaimer-bottom a:hover {
  text-decoration: underline;
}

.disclaimer-bottom p:last-child {
  margin-bottom: 0;
}

body.sheet-open {
  overflow: hidden;
}

/* Focus visibility across the product */
.btn-ghost:focus-visible,
.family-chip:focus-visible,
.hot-chip:focus-visible,
.ledger-row:focus-visible,
.az-btn:focus-visible,
.sheet-close:focus-visible,
.jump-btn:focus-visible,
.related-list button:focus-visible,
.legend-toggle:focus-visible,
.empty-link:focus-visible,
.active-filter-chip:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

@media (max-width: 639px) {
  .disclaimer-top {
    padding: 0.42rem 0.7rem;
    font-size: 0.68rem;
    line-height: 1.28;
  }

  .self-command-inner {
    width: min(calc(100% - 1.5rem), 1180px);
    padding: 0.95rem 0 0.85rem;
  }

  .self-identity {
    margin-bottom: 0.8rem;
  }

  .self-title-row {
    display: grid;
    gap: 0.25rem;
  }

  .self-lead {
    color: var(--ink-muted);
  }

  .self-guardrails span {
    min-height: 1.55rem;
    padding: 0.16rem 0.48rem;
    font-size: 0.6rem;
  }

  .search-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .search-wrap {
    grid-column: 1 / -1;
  }

  .self-command .search-row > .btn-ghost {
    width: 100%;
  }

  .az-rail {
    padding-inline: 0.45rem;
  }

  .az-btn {
    min-width: 1.9rem;
  }

  .section-head {
    align-items: flex-start;
  }

  .popular-count,
  .directory-count {
    min-height: 1.8rem;
  }

  .directory-section {
    padding-top: 1.65rem;
  }

  .row-signal {
    max-width: 4.6rem;
    font-size: 0.58rem;
  }
}

@media (min-width: 640px) {
  .popular-grid {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: visible;
    scroll-snap-type: none;
  }
}

/* Desktop */
@media (min-width: 900px) {
  .chrome-flow {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  .workspace {
    width: min(calc(100% - 3rem), 1180px);
    padding-bottom: 5rem;
  }

  .az-rail {
    padding-inline: 0.55rem;
  }

  .az-btn {
    flex: 1 1 2rem;
  }

  .sheet {
    left: auto;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(520px, 46vw);
    height: 100%;
    max-height: 100%;
    border-radius: 0;
    transform: translateX(105%);
  }

  .sheet.open {
    transform: translateX(0);
  }

  .sheet-title {
    font-size: 1.35rem;
    white-space: normal;
  }
}

@media (min-width: 1000px) {
  .popular-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .sheet {
    width: min(560px, 42vw);
  }
}