/* roughlogic.com - dark "encryptalotta" theme.
   Visual contract intentionally mirrors encryptalotta.com:
   - near-black/charcoal/graphite layered surfaces
   - white-on-dark text with two muted secondary tints
   - rounded cards with arrow-on-hover affordance
   - pill buttons, sticky topbar, gentle entry animations
   Spec.md section 8 (no emoji, no em-dash) and section 11 (live-render,
   48 px touch targets, single-h1 per view, aria-live output region) all
   continue to hold.
*/

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

/* The HTML `hidden` attribute should always hide an element, even when
   author CSS gives that element a more specific `display` rule (e.g.,
   the `.copy-all-btn` rule below sets `display: inline-flex`, which by
   specificity outranks the user-agent `[hidden] { display: none }`).
   This rule restores the expected behavior so `el.hidden = true` always
   visually hides the element. */
[hidden] { display: none !important; }

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;

  --fg: #ffffff;
  --fg-muted: #c8c8c8;       /* 8.5:1 on bg-secondary */
  --fg-dim: #9a9a9a;         /* 5.5:1 on bg-secondary */

  --border: #333333;
  --border-light: #404040;

  --accent-hover: #e0e0e0;
  --focus-ring: #4d90fe;
  --heart: #ff5d6c;

  /* Validity / error tokens. The dark-mode pair (border + reason) keeps
     readable contrast on bg-secondary; the light-mode override below
     swaps to deeper red shades that meet WCAG AA on white (>= 4.5:1). */
  --error-border: #ff5d6c;
  --error-text: #ff8c95;

  --header-bg: rgba(10, 10, 10, 0.85);

  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 14px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;

  --touch-min: 48px;
  --shell-max: 1100px;

  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, 'Cascadia Mono',
    'Roboto Mono', Consolas, 'Liberation Mono', monospace;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-primary);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--border-light);
  text-underline-offset: 3px;
}

a:hover { text-decoration-color: var(--fg); }

a:focus, button:focus, select:focus, input:focus, textarea:focus,
[tabindex]:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

button {
  font-family: inherit;
}

main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-5);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-2);
  background: var(--bg-secondary);
  color: var(--fg);
  padding: 10px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  left: var(--space-3);
}

/* Visually hidden (accessible) */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ============================================================
   Sticky topbar / site header (encryptalotta visual mirror)
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: rl-fade-down 0.5s ease-out;
}

.header-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--fg);
  flex: 0 0 auto;
  border-radius: var(--radius);
  padding: 4px 6px;
  margin: -4px -6px;
  transition: opacity 0.18s ease;
}

.brand:hover { opacity: 0.85; }

.header-search {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

.header-search .search-input {
  width: 100%;
  max-width: 520px;
  padding: 10px 16px;
  font-size: 0.95rem;
  background: var(--bg-secondary);
  border-color: var(--border);
}

.header-search .search-input:focus {
  background: var(--bg-tertiary);
  border-color: var(--fg-muted);
}

.wordmark {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.tagline {
  font-size: 0.92rem;
  color: var(--fg-muted);
}

.primary-nav {
  flex: 0 0 auto;
}

.primary-nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 12px;
  border-radius: var(--radius);
}

.primary-nav a:hover {
  color: var(--fg);
  background: var(--bg-secondary);
}

/* ============================================================
   Search input (header) - shared visual rules.
   The trade/group filter row was removed at the user's request; all
   filtering now happens via the header search box only.
   ============================================================ */
.search-input {
  width: 100%;
  background: var(--bg-tertiary);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.search-input::placeholder { color: var(--fg-dim); }

.search-input:focus {
  border-color: var(--fg);
  background: var(--bg-secondary);
}

/* "Clear pins" pill - kept lightweight since it's the only remaining
   .filter-btn left in the DOM. Touch-target floor matches spec.md
   section 11.6.                                                       */
.filter-btn {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0 16px;
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.filter-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--fg-muted);
  color: var(--fg);
}

/* ============================================================
   Tile grid - encryptalotta tool-card visual mirror
   ============================================================ */
.tile-grid-region {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  margin-bottom: var(--space-6);
}

#tools.tile-grid-region { margin-top: var(--space-5); }

/* Group sections rendered on the home view (one block per spec.md group). */
.tools-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.tools-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.tools-section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
}

.tools-section-label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
}

.tools-section-count {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--fg-dim);
  font-variant-numeric: tabular-nums;
}

.empty-state {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg-muted);
  text-align: center;
  font-size: 0.95rem;
}

.tile-grid-region:last-child { margin-bottom: var(--space-3); }

.pinned-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.pinned-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-dim);
  margin: 0;
  padding-left: 4px;
}

#pinned-region { animation: rl-fade-up 0.4s ease-out; }

.tile-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-3);
  padding: 0;
  margin: 0;
}

.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) 22px;
  min-height: 110px;
  color: var(--fg);
  transition: transform 0.18s ease, border-color 0.18s ease,
    background 0.18s ease, box-shadow 0.18s ease;
}

.tile::after {
  content: "->";
  position: absolute;
  top: 22px;
  right: 22px;
  color: var(--fg-dim);
  font-family: var(--font-mono);
  font-size: 1rem;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease, color 0.18s ease;
}

.tile:hover,
.tile:focus-within {
  border-color: var(--border-light);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

.tile:hover::after,
.tile:focus-within::after {
  opacity: 1;
  transform: translateX(0);
  color: var(--fg);
}

.tile-title {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--fg);
  margin: 0;
  padding-right: 28px;
}

.tile-desc {
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

.tile-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-dim);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.tile-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.tile-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0 16px;
  background: var(--fg);
  color: var(--bg-primary);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  transition: background 0.18s ease, transform 0.12s ease;
}

.tile-link:hover, .tile-link:focus {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Card-link pattern: the entire tile body shows a pointer cursor so
   users can see the whole card is clickable. The actual click routing
   is handled by a JS handler on `.tile` that reads `data-tool` and
   calls navigateTo(). The Pin button has `position: relative; z-index`
   so its own click is not intercepted by the tile-level handler. */
.tile { cursor: pointer; }
.tile-pin {
  position: relative;
  z-index: 2;
  cursor: pointer;
}

.tile-pin {
  min-height: var(--touch-min);
  padding: 0 16px;
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.tile-pin:hover {
  color: var(--fg);
  border-color: var(--fg-muted);
  background: var(--bg-secondary);
}

.tile-pin[aria-pressed="true"] {
  background: var(--fg);
  color: var(--bg-primary);
  border-color: var(--fg);
}

/* ============================================================
   Tool view (content panel)
   ============================================================ */
.view-region {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  margin-top: var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-4);
  animation: rl-fade-up 0.4s ease-out;
}

.view-header-row {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0 14px;
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.back-link:hover {
  color: var(--fg);
  border-color: var(--border-light);
  background: var(--bg-tertiary);
}

.view-pin,
.view-share,
.view-bundle-copy,
.view-bundle-download,
.view-print {
  min-height: var(--touch-min);
  padding: 0 var(--space-3);
  background: var(--bg-tertiary);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
}

.view-pin:hover,
.view-share:hover,
.view-bundle-copy:hover,
.view-bundle-download:hover,
.view-print:hover {
  background: var(--bg-primary);
  border-color: var(--border-light);
  transform: translateY(-1px);
}

.view-pin[aria-pressed="true"] {
  background: var(--fg);
  color: var(--bg-primary);
  border-color: var(--fg);
}

.view-bundle-load {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  gap: var(--space-2);
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--fg);
  font-size: 0.88rem;
}

.view-bundle-load input[type="file"] {
  font-size: 0.82rem;
  min-height: 32px;
  color: var(--fg-muted);
}

.view-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-2);
  color: var(--fg);
}

.view-desc {
  font-size: 1.05rem;
  color: var(--fg-muted);
  margin: 0 0 var(--space-4);
}

.inline-notice {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--fg);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: var(--space-4);
  font-size: 0.92rem;
  color: var(--fg-muted);
}

/* v10 §B.1 limitation-banner: visually distinct from the citation
   footer and the result-area context band. Reuses .inline-notice as a
   base and thickens the left rule so the "what this is NOT" message
   reads at a glance. Color follows the High-Contrast palette through
   the existing inline-notice hook. */
.limitation-banner {
  border-left-width: 5px;
}
.limitation-banner .limitation-headline {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
  color: var(--fg);
}
.limitation-banner .limitation-replacement,
.limitation-banner .limitation-governs,
.limitation-banner .limitation-link {
  margin: 6px 0 0;
}
.limitation-banner .limitation-link a {
  color: var(--fg);
  text-decoration: underline;
}

.citation {
  font-size: 0.85rem;
  color: var(--fg-dim);
  font-style: italic;
  margin-bottom: var(--space-3);
}

.input-region, .output-region {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
}

/* Hide an empty input-region. Group H reference utilities (color codes,
   knot reference, etc.) render their content into the output region and
   leave the input region empty; without this rule the empty bordered
   box reads as a layout glitch. */
.input-region:empty { display: none; }

.input-region .field {
  margin-bottom: var(--space-3);
}

.input-region .field:last-child { margin-bottom: 0; }

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--fg);
  font-size: 0.92rem;
}

input[type="number"],
input[type="text"],
select,
textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-primary);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.18s ease, background 0.18s ease;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
  border-color: var(--fg);
  background: var(--bg-secondary);
}

input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--fg);
  vertical-align: middle;
  margin-right: 8px;
}

input::placeholder, textarea::placeholder { color: var(--fg-dim); }

input[aria-invalid="true"] {
  border-color: var(--error-border);
}

.validity-reason {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--error-text);
}

.output-region {
  background: var(--bg-primary);
}

.output-region p {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  color: var(--fg);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.output-region strong {
  color: var(--fg-muted);
  font-weight: 600;
  min-width: 0;
}

.out-value {
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.98rem;
}

.output-region.output-stale .out-value,
.output-region.output-stale span {
  text-decoration: line-through;
  color: var(--fg-dim);
}

.output-region dl {
  margin: 0;
}

.output-region dt {
  margin-top: var(--space-3);
  font-weight: 700;
  color: var(--fg);
}

.output-region dt:first-child { margin-top: 0; }

.output-region dd {
  margin: 4px 0 var(--space-2) 0;
  color: var(--fg-muted);
}

.output-region ul, .output-region ol {
  margin: 0 0 var(--space-2) var(--space-3);
  padding: 0;
  color: var(--fg-muted);
}

.output-region li {
  margin-bottom: 6px;
}

/* Per-output Copy and Copy-all. Min 48 px touch target per spec.md
   section 11.6 / spec-v2.md section 1. */
.copy-btn,
.copy-all-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-min);
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.copy-btn:hover,
.copy-all-btn:hover {
  color: var(--bg-primary);
  background: var(--fg);
  border-color: var(--fg);
}

.copy-all-btn {
  margin-top: var(--space-3);
}

.sources-region {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

/* v10 §6.2 (Phase D) companion-tile strip. Inline list of related-tile
   links below the result region. Visually subordinate to the result
   itself; no decorative icons (per spec hard-rules). Companions are the
   same for every user, computed at build time, and identical across
   themes. */
.companion-strip {
  margin-top: var(--space-3);
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-size: 0.92rem;
}
.companion-strip-heading {
  margin: 0 0 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: none;
  letter-spacing: 0;
}
.companion-strip-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}
.companion-strip-list li { margin: 0; }
.companion-strip-link {
  color: var(--fg);
  text-decoration: underline;
}
.companion-strip-link:hover,
.companion-strip-link:focus { text-decoration: none; }

.data-source-stamp {
  font-size: 0.82rem;
  color: var(--fg-dim);
  font-family: var(--font-mono);
  margin: 0;
}

/* v6 §3 reference block. Mounts in the sources-region beneath the result,
   above the legacy data-source-stamp. Sized at the same scale as the answer
   per spec §8 (the reference is part of the answer). */
.v6-reference-block {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px dashed var(--border);
}
.v6-reference-heading {
  font-size: 1rem;
  margin: 0 0 var(--space-2) 0;
}
.v6-reference-subheading {
  font-size: 0.95rem;
  margin: var(--space-2) 0 var(--space-1) 0;
}
.v6-reference-list,
.v6-assumption-list {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px var(--space-2);
}
.v6-reference-list dt,
.v6-assumption-list dt {
  font-weight: 600;
  white-space: nowrap;
}
.v6-reference-list dd,
.v6-assumption-list dd {
  margin: 0;
}
.v6-assumption-note {
  margin: var(--space-1) 0 0 0;
  font-size: 0.9rem;
  color: var(--fg-dim);
}
.view-copy-reference {
  margin-top: var(--space-3);
  min-height: var(--touch-min);
}

/* ============================================================
   Footer (encryptalotta credit-pill mirror)
   ============================================================ */
.site-footer {
  margin: var(--space-6) auto var(--space-5);
  max-width: var(--shell-max);
  padding: 0 var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.site-footer .disclaimer {
  font-size: 0.82rem;
  color: var(--fg-dim);
  max-width: 720px;
  line-height: 1.6;
  margin: 0;
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-secondary);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease, box-shadow 0.18s ease;
}

.footer-badge:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.footer-badge-icon {
  display: block;
}

.footer-badge-heart {
  color: var(--heart);
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.18s ease;
}

.footer-badge:hover .footer-badge-heart {
  transform: scale(1.18);
}

/* Integrity banner */
.integrity-banner {
  background: var(--bg-secondary);
  border: 1px solid var(--error-border);
  border-left: 4px solid var(--error-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: var(--space-3) auto;
  max-width: var(--shell-max);
  color: var(--fg);
  font-size: 0.92rem;
}

/* ============================================================
   Animations
   ============================================================ */
/* Entry animations: transform-only so element contents render at full
   contrast at every frame. An opacity ramp would briefly composite text
   at sub-full opacity over the body bg, producing apparent low-contrast
   that axe-core flags as a WCAG 2 AA violation. */
@keyframes rl-fade-up {
  from { transform: translateY(12px); }
  to { transform: translateY(0); }
}

@keyframes rl-fade-down {
  from { transform: translateY(-8px); }
  to { transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   Changelog static viewer (scoped)
   ============================================================ */
#changelog-content h2 {
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-1);
  font-size: 1.4rem;
  color: var(--fg);
}

#changelog-content h3 {
  margin-top: var(--space-3);
  margin-bottom: var(--space-2);
  font-size: 1.05rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#changelog-content h4 {
  margin-top: var(--space-2);
  margin-bottom: var(--space-1);
  font-size: 0.95rem;
  color: var(--fg-dim);
}

#changelog-content ul {
  margin: 0 0 var(--space-3) var(--space-3);
  padding: 0;
  color: var(--fg-muted);
}

#changelog-content li {
  margin-bottom: var(--space-2);
}

#changelog-content p {
  margin: 0 0 var(--space-2) 0;
  color: var(--fg-muted);
}

/* ============================================================
   Mobile breakpoint
   ============================================================ */
.noscript-notice {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--fg-muted);
  font-size: 0.92rem;
  margin: var(--space-4) auto;
  max-width: 720px;
  text-align: center;
}

@media (max-width: 760px) {
  main { padding: 0 var(--space-3) var(--space-4); }
  .header-inner {
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 10px;
  }
  .wordmark { font-size: 1.1rem; }
  .tagline { display: none; }
  /* Mobile header lays out as two rows:
     row 1: brand (left) + theme toggle (right)
     row 2: search bar (full width)
     The search wraps to its own row via flex: 1 1 100%; explicit order
     values prevent any future-added element from squeezing it back. */
  .brand { order: 1; }
  .theme-toggle { order: 2; margin-left: auto; }
  .header-search { order: 3; flex: 1 1 100%; }
  .header-search .search-input { max-width: 100%; }
  .tile-grid-region { padding: 0 var(--space-3); }
  #tools.tile-grid-region { margin-top: var(--space-4); }
  .tile-grid { grid-template-columns: 1fr; gap: 12px; }
  .tile { padding: 20px 18px; min-height: 96px; }
  .tile::after { top: 18px; right: 18px; }
  .view-region { padding: var(--space-4) var(--space-3); }
  .view-title { font-size: 1.7rem; }
  .site-footer { margin: var(--space-5) auto var(--space-4); }
  /* v12 Phase F.1: the reference block uses
     grid-template-columns: max-content 1fr on dt+dd. At a 375 px
     viewport the longest dt label ("Edition selector / disclosure")
     plus a long codes.iccsafe.org / nfpa.org / ecfr.gov URL in dd
     overflows the container because max-content does not shrink
     below intrinsic min-width. Collapse to a single-column stack
     on mobile and allow long URLs to break anywhere. Same treatment
     for the citation footer, the data-source stamp, and the
     limitation banner so every long-string surface wraps cleanly. */
  .v6-reference-list,
  .v6-assumption-list {
    grid-template-columns: 1fr;
    gap: 2px var(--space-2);
  }
  .v6-reference-list dt,
  .v6-assumption-list dt {
    white-space: normal;
    margin-top: var(--space-2);
  }
  .v6-reference-list dd,
  .v6-assumption-list dd,
  .v6-assumption-note,
  .citation,
  .data-source-stamp,
  .limitation-banner {
    overflow-wrap: anywhere;
    word-break: break-word;
  }
}

/* ============================================================
   Print stylesheet
   ============================================================ */
@media print {
  .site-header, .header-search, .primary-nav, .skip-link,
  .tile-pin, .view-pin, .copy-btn, .copy-all-btn, .tile-actions,
  .view-share, .view-bundle-copy, .view-bundle-download, .view-bundle-load,
  .view-print, .integrity-banner, #pinned-region,
  .back-link, .site-footer .footer-badges {
    display: none !important;
  }
  body, .view-region, .input-region, .output-region {
    background: white !important;
    color: black !important;
    border-color: #999 !important;
  }
  .view-region, .input-region, .output-region {
    box-shadow: none !important;
  }
  a {
    color: black !important;
    text-decoration: underline !important;
  }
}

/* ============================================================
   Light theme override.
   Activated by `<html data-theme="light">` (set by theme.js before paint).
   The dark palette in :root remains the default so the site still
   renders correctly when the script has not yet run.
   ============================================================ */
:root[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #e8e8e8;

  --fg: #0a0a0a;
  --fg-muted: #404040;
  --fg-dim: #5e5e5e;

  --border: #d0d0d0;
  --border-light: #b8b8b8;

  --accent-hover: #2a2a2a;

  --header-bg: rgba(255, 255, 255, 0.85);

  /* Deeper reds that hit WCAG AA on white (5.4:1 and 6.6:1). */
  --error-border: #c0392b;
  --error-text: #a93226;
}

/* ============================================================
   Theme toggle button (sun/moon)
   ============================================================ */
.theme-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-min);
  height: var(--touch-min);
  padding: 0;
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.theme-toggle:hover {
  color: var(--fg);
  background: var(--bg-secondary);
  border-color: var(--fg-muted);
}

.theme-icon {
  display: none;
}

/* In dark mode show the sun (clicking switches to light). In light mode
   show the moon. The button toggles between dark and light. */
:root:not([data-theme="light"]) .theme-icon-sun { display: block; }
:root[data-theme="light"] .theme-icon-moon { display: block; }

/* ============================================================
   Field Notes scratchpad (v3 utility 185).
   Per-tool 280-char textarea bound to the URL hash `k=...`. Notes never
   leave the page.
   ============================================================ */
.scratchpad-region {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.scratchpad-region label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  color: var(--fg-muted);
}
.scratchpad-input {
  width: 100%;
  min-height: var(--touch-min);
  background: var(--bg-tertiary);
  color: var(--fg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
}
.scratchpad-note {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--fg-dim);
}
@media print {
  .scratchpad-region { background: transparent; border: 1px solid #000; }
  .scratchpad-note { display: none; }
}

/* ============================================================
   Crash-Safe Resume panel (v3 utility 187).
   ============================================================ */
.crash-panel {
  border-color: var(--error-border);
  color: var(--error-text);
}

/* ============================================================
   Preset chip row (v8 §C.1 wire-ampacity ambient presets).
   Chips render as a horizontal group below the input they prefill.
   Each chip honors the 48 px touch-min like every other interactive
   control.
   ============================================================ */
.preset-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
}
.preset-chip {
  min-height: var(--touch-min);
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--fg);
  font-size: 0.88rem;
  cursor: pointer;
}
.preset-chip:hover, .preset-chip:focus {
  background: var(--bg-primary);
  border-color: var(--border-light);
}

/* ============================================================
   v9 §F.2 lightning-countdown 30-minute resume timer.
   The hidden persistence input (id="lc-timer") is type="hidden" and
   layout-invisible via the UA stylesheet; the visible button + readout
   sit side-by-side in a flex row. The readout is monospace + tabular-
   nums so the count does not jiggle laterally as digits change.
   ============================================================ */
.lightning-timer-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.lightning-timer-btn,
.lightning-timer-reset {
  min-height: var(--touch-min);
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--fg);
  font-size: 0.95rem;
  cursor: pointer;
}
.lightning-timer-btn:hover, .lightning-timer-btn:focus,
.lightning-timer-reset:hover, .lightning-timer-reset:focus {
  background: var(--bg-primary);
  border-color: var(--border-light);
}
.lightning-timer-readout {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-variant-numeric: tabular-nums;
  font-size: 1.1rem;
  min-width: 5.5ch;
  text-align: center;
  color: var(--fg);
}

/* ============================================================
   v5 Step 62 utility 269: CSV export button.
   ============================================================ */
.copy-csv-btn {
  min-height: var(--touch-min);
  margin: var(--space-2) 0;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--fg);
  font-size: 0.88rem;
  cursor: pointer;
}
.copy-csv-btn:hover, .copy-csv-btn:focus {
  background: var(--bg-primary);
  border-color: var(--border-light);
}

/* ============================================================
   v5 Step 62 utility 270: Print-optimized table view.
   Multi-row tables (amortization, mileage roll-up, PCR master mix)
   need rows that don't break across pages and a thead that repeats
   on every printed page. Wrapper class scopes the rules so non-tabular
   prints aren't affected.
   ============================================================ */
@media print {
  .tabular-tool table {
    page-break-inside: auto;
    border-collapse: collapse;
    width: 100%;
  }
  .tabular-tool tr {
    page-break-inside: avoid;
    page-break-after: auto;
  }
  .tabular-tool thead {
    display: table-header-group;
  }
  .tabular-tool tfoot {
    display: table-footer-group;
  }
  .tabular-tool th, .tabular-tool td {
    border: 1px solid #000;
    padding: 4px 8px;
    font-size: 10pt;
  }
}

/* ============================================================
   v5 Step 62 utility 271: Inline glossary tooltip.
   Tooltip is hidden by default; the JS toggle in v5-platform.js
   shows / hides it via inline style. Positioned inline so it
   renders next to the field; mobile reads it inline as a clarifying
   line of text when shown.
   ============================================================ */
.glossary-tooltip {
  display: inline-block;
  margin: var(--space-1) 0 var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--fg);
  font-size: 0.8125rem;
  max-width: 60ch;
}