/* ═══════════════════════════════════════════════════════════════
   DOCSEARCH PRO — style.css
   Theme: shadcn/ui dark · matched to StyleGuard v0.1.0
   Geist + Geist Mono · rounded panes · neutral tokens
═══════════════════════════════════════════════════════════════ */

/* ── 1. SHARED TOKENS ─────────────────────────────────────── */
:root {
  --radius:    0.625rem;
  --radius-sm: calc(var(--radius) * 0.6);
  --radius-md: calc(var(--radius) * 0.8);
  --radius-lg: var(--radius);
  --radius-xl: calc(var(--radius) * 1.4);

  --font-sans: 'Geist', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'Geist Mono', 'JetBrains Mono', ui-monospace, monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-mid:  250ms;
}

/* ── 2. DARK TOKENS ───────────────────────────────────────── */
[data-theme="dark"] {
  color-scheme: dark;
  --background:           #09090b;
  --card:                 #18181b;
  --secondary:            #27272a;
  --muted:                #27272a;
  --accent:               #27272a;
  --foreground:           #fafafa;
  --card-foreground:      #fafafa;
  --primary:              #e4e4e7;
  --primary-foreground:   #18181b;
  --secondary-foreground: #fafafa;
  --muted-foreground:     #a1a1aa;
  --accent-foreground:    #fafafa;
  --border:               rgba(255,255,255,0.10);
  --input:                rgba(255,255,255,0.15);
  --ring:                 #71717a;
  --toggle-border:        rgba(255,255,255,0.18);

  --stat-words-bg:    rgba( 96,165,250,.10); --stat-words-fg:    #93c5fd;
  --stat-lines-bg:    rgba(251,191, 36,.10); --stat-lines-fg:    #fcd34d;
  --stat-sections-bg: rgba( 52,211,153,.10); --stat-sections-fg: #6ee7b7;

  --highlight-bg:  rgba(251,191,36,.25);
  --highlight-fg:  #fcd34d;
  --match-border:  rgba(251,191,36,.35);
}

/* ── 3. LIGHT TOKENS ──────────────────────────────────────── */
[data-theme="light"] {
  color-scheme: light;
  --background:           #ffffff;
  --card:                 #ffffff;
  --secondary:            #f4f4f5;
  --muted:                #f4f4f5;
  --accent:               #f4f4f5;
  --foreground:           #09090b;
  --card-foreground:      #09090b;
  --primary:              #18181b;
  --primary-foreground:   #fafafa;
  --secondary-foreground: #18181b;
  --muted-foreground:     #71717a;
  --accent-foreground:    #18181b;
  --border:               rgba(0,0,0,0.10);
  --input:                rgba(0,0,0,0.08);
  --ring:                 #a1a1aa;
  --toggle-border:        rgba(0,0,0,0.15);

  --stat-words-bg:    rgba( 37, 99,235,.07); --stat-words-fg:    #1d4ed8;
  --stat-lines-bg:    rgba(161,109,  8,.07); --stat-lines-fg:    #92400e;
  --stat-sections-bg: rgba(  5,150,105,.07); --stat-sections-fg: #065f46;

  --highlight-bg:  rgba(161,109,8,.15);
  --highlight-fg:  #92400e;
  --match-border:  rgba(161,109,8,.3);
}

/* ── 4. THEME TRANSITION ──────────────────────────────────── */
body, .site-header, .pane, .pane-header, .pane-step,
.stat, .site-footer, .btn,
.field-input, .field-textarea, .search-input,
.drop-zone, .doc-item, .result-card {
  transition:
    background-color var(--dur-mid) var(--ease-out),
    border-color     var(--dur-mid) var(--ease-out),
    color            var(--dur-mid) var(--ease-out),
    box-shadow       var(--dur-mid) var(--ease-out);
}

/* ── 5. RESET & BASE ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--foreground);
  background-color: var(--background);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ── 6. HEADER ────────────────────────────────────────────── */
.site-header {
  background-color: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand { display: flex; align-items: center; gap: 0.625rem; }

.brand-icon {
  width: 28px; height: 28px;
  background: var(--primary);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.625rem; font-weight: 600;
  color: var(--primary-foreground);
  letter-spacing: -0.02em;
}

.brand-text { display: flex; flex-direction: column; gap: 1px; }

.brand-name {
  font-size: 0.9375rem; font-weight: 600;
  letter-spacing: -0.015em; color: var(--foreground); line-height: 1.2;
}

.brand-tagline {
  font-size: 0.6875rem; color: var(--muted-foreground);
  font-weight: 400; line-height: 1;
}

.header-right { display: flex; align-items: center; gap: 0.75rem; }

/* ── 7. THEME TOGGLE ──────────────────────────────────────── */
.btn--icon {
  display: inline-flex; align-items: center; gap: 0.4rem;
  height: 2rem; padding: 0 0.75rem;
  border-radius: 9999px;
  background: var(--secondary);
  border: 1px solid var(--toggle-border);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 0.75rem; font-weight: 500;
  cursor: pointer; flex-shrink: 0;
  white-space: nowrap; line-height: 1;
  transition:
    background   var(--dur-fast) var(--ease-out),
    box-shadow   var(--dur-fast) var(--ease-out);
}

.btn--icon:hover        { background: var(--accent); box-shadow: 0 0 0 1px var(--ring); }
.btn--icon:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
.theme-toggle-label     { line-height: 1; }

[data-theme="dark"]  .icon-sun    { display: none; }
[data-theme="dark"]  .icon-moon   { display: block; }
[data-theme="light"] .icon-moon   { display: none; }
[data-theme="light"] .icon-sun    { display: block; }
[data-theme="dark"]  .label-dark  { display: inline; }
[data-theme="dark"]  .label-light { display: none; }
[data-theme="light"] .label-dark  { display: none; }
[data-theme="light"] .label-light { display: inline; }

.btn--icon.toggling svg { animation: spin-icon 0.35s var(--ease-out) both; }

@keyframes spin-icon {
  from { transform: rotate(-30deg) scale(0.8); opacity: 0; }
  to   { transform: rotate(0)      scale(1);   opacity: 1; }
}

/* ── 8. APP SHELL ─────────────────────────────────────────── */
.app-shell {
  flex: 1;
  max-width: 1280px; width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1rem;
  align-items: stretch;
}

/* ── 9. PANES ─────────────────────────────────────────────── */
.pane {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex; flex-direction: column;
}

.pane:focus-within { box-shadow: 0 0 0 1px var(--ring); }

.pane-header {
  display: flex; align-items: center;
  justify-content: space-between; gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.pane-title {
  font-size: 0.8125rem; font-weight: 500;
  color: var(--foreground);
  display: flex; align-items: center;
  gap: 0.5rem; line-height: 1;
}

.pane-step {
  font-family: var(--font-mono);
  font-size: 0.625rem; color: var(--muted-foreground);
  background: var(--secondary); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.15em 0.45em; line-height: 1.4;
}

/* ── 10. DROP ZONE ────────────────────────────────────────── */
.drop-zone {
  margin: 0.75rem 1rem 0;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition:
    border-color var(--dur-fast) var(--ease-out),
    background   var(--dur-fast) var(--ease-out);
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.drag-over {
  border-color: var(--ring);
  background: var(--secondary);
  outline: none;
}

.drop-zone-inner {
  display: flex; flex-direction: column;
  align-items: center; gap: 0.5rem;
  pointer-events: none;
}

.drop-zone-icon { color: var(--muted-foreground); opacity: 0.4; }

.drop-zone-text {
  font-size: 0.8125rem; color: var(--foreground);
}

.drop-zone-text code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.05em 0.3em;
}

.drop-zone-subtext {
  font-size: 0.6875rem; color: var(--muted-foreground);
}

/* ── 11. DOC LIST ─────────────────────────────────────────── */
.doc-list-wrap {
  margin: 0.5rem 1rem 0;
  max-height: 180px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.doc-list-wrap::-webkit-scrollbar       { width: 4px; }
.doc-list-wrap::-webkit-scrollbar-track { background: transparent; }
.doc-list-wrap::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 2px; }

.doc-list { list-style: none; }

.doc-item {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  animation: fade-up 0.2s var(--ease-out) both;
}

.doc-item:last-child { border-bottom: none; }

.doc-item-icon { color: var(--muted-foreground); opacity: 0.5; flex-shrink: 0; }

.doc-item-name {
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--foreground); flex: 1;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.doc-item-words {
  font-family: var(--font-mono); font-size: 0.625rem;
  color: var(--muted-foreground);
  white-space: nowrap; flex-shrink: 0;
}

.doc-item-remove {
  background: transparent; border: none;
  color: var(--muted-foreground);
  cursor: pointer; padding: 2px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center;
  opacity: 0; flex-shrink: 0;
  transition: opacity var(--dur-fast) var(--ease-out),
              color   var(--dur-fast) var(--ease-out);
}

.doc-item:hover .doc-item-remove { opacity: 1; }
.doc-item-remove:hover { color: var(--foreground); }
.doc-item-remove:focus-visible { outline: 2px solid var(--ring); outline-offset: 1px; opacity: 1; }

/* ── 12. PASTE AREA ───────────────────────────────────────── */
.paste-toggle-wrap {
  padding: 0.5rem 1rem 0;
}

.paste-toggle-btn {
  font-size: 0.75rem; gap: 0.35rem;
}

.paste-toggle-chevron {
  transition: transform var(--dur-fast) var(--ease-out);
}

.paste-toggle-btn[aria-expanded="true"] .paste-toggle-chevron {
  transform: rotate(180deg);
}

.paste-area {
  margin: 0.25rem 0 0;
  border-top: 1px solid var(--border);
  animation: fade-up 0.2s var(--ease-out) both;
}

/* ── 13. FORM FIELDS ──────────────────────────────────────── */
.field-group {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border);
}
.field-group:last-child { border-bottom: none; }

.field-label {
  display: flex; align-items: center; gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--muted-foreground); opacity: 0.65;
  margin-bottom: 0.375rem;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.field-group:focus-within .field-label { opacity: 1; }

.required-star { color: var(--muted-foreground); }

.field-input, .field-textarea {
  font-family: var(--font-mono); font-size: 0.8125rem;
  font-weight: 300; line-height: 1.75;
  color: var(--foreground); background: transparent;
  border: none; border-bottom: 1px solid var(--input);
  outline: none; width: 100%; padding: 0.25rem 0;
  resize: none; caret-color: var(--foreground);
  transition: border-color var(--dur-fast) var(--ease-out);
}

.field-input::placeholder,
.field-textarea::placeholder { color: var(--muted-foreground); opacity: 0.5; }

.field-input:focus,
.field-textarea:focus { border-bottom-color: var(--ring); }

.field-textarea { min-height: 80px; }

.field-select {
  font-family: var(--font-sans); font-size: 0.8125rem;
  font-weight: 300; color: var(--foreground);
  background: var(--secondary);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 0.35rem 2rem 0.35rem 0.65rem;
  cursor: pointer; outline: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2371717a' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.65rem center;
  transition: border-color var(--dur-fast) var(--ease-out),
              box-shadow   var(--dur-fast) var(--ease-out);
}

.field-select:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--ring) 30%, transparent);
}

.field-select option { background: var(--card); color: var(--foreground); }

/* ── 14. BUTTONS ──────────────────────────────────────────── */
.input-actions {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-top: 1px solid var(--border);
}

.btn {
  font-family: var(--font-sans); font-size: 0.8125rem;
  font-weight: 500; cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 0 0.875rem; height: 2rem;
  display: inline-flex; align-items: center; gap: 0.375rem;
  white-space: nowrap; user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    background    var(--dur-fast) var(--ease-out),
    color         var(--dur-fast) var(--ease-out),
    border-color  var(--dur-fast) var(--ease-out),
    opacity       var(--dur-fast) var(--ease-out);
}

.btn--primary {
  background: var(--primary); color: var(--primary-foreground);
  border-color: var(--primary);
}
.btn--primary:hover   { opacity: 0.88; }
.btn--primary:active  { opacity: 0.75; }
.btn--primary:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.btn--ghost {
  background: transparent; color: var(--muted-foreground);
}
.btn--ghost:hover  { background: var(--accent); color: var(--accent-foreground); }
.btn--ghost:active { opacity: 0.8; }
.btn--ghost:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.btn--copy {
  font-size: 0.6875rem; height: 1.75rem;
  padding: 0 0.625rem;
  border: 1px solid var(--border);
  color: var(--muted-foreground); background: transparent;
}
.btn--copy:hover { color: var(--foreground); border-color: var(--ring); background: var(--secondary); }
.btn--copy:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.btn--success {
  color: var(--stat-sections-fg) !important;
  border-color: var(--stat-sections-fg) !important;
  background: var(--stat-sections-bg) !important;
}

.btn--warn {
  color: var(--stat-lines-fg) !important;
  border-color: var(--stat-lines-fg) !important;
  background: var(--stat-lines-bg) !important;
}

.btn:disabled { opacity: 0.4; cursor: not-allowed; pointer-events: none; }

/* ── 15. STATS BAR ────────────────────────────────────────── */
#stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.stat {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 0.75rem 0.5rem; gap: 0.2rem;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }

.stat-value {
  font-size: 1.375rem; font-weight: 600;
  line-height: 1; letter-spacing: -0.02em;
}

.stat-label {
  font-family: var(--font-mono); font-size: 0.5625rem;
  letter-spacing: 0.07em; text-transform: uppercase; opacity: 0.65;
}

.stat--words    { background: var(--stat-words-bg); }
.stat--words    .stat-value, .stat--words    .stat-label { color: var(--stat-words-fg); }
.stat--lines    { background: var(--stat-lines-bg); }
.stat--lines    .stat-value, .stat--lines    .stat-label { color: var(--stat-lines-fg); }
.stat--sections { background: var(--stat-sections-bg); }
.stat--sections .stat-value, .stat--sections .stat-label { color: var(--stat-sections-fg); }

.stat-value.updated { animation: pop-value 0.3s var(--ease-out) forwards; }

@keyframes pop-value {
  0%   { transform: scale(1.25); opacity: 0.5; }
  100% { transform: scale(1);    opacity: 1; }
}

/* ── 16. SEARCH INPUT ─────────────────────────────────────── */
.search-input-wrap {
  position: relative;
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.5rem;
}

.search-input-icon {
  color: var(--muted-foreground);
  flex-shrink: 0; pointer-events: none;
}

.search-input {
  flex: 1;
  font-family: var(--font-mono); font-size: 0.875rem;
  font-weight: 300; color: var(--foreground);
  background: transparent; border: none; outline: none;
  caret-color: var(--foreground);
  padding: 0.25rem 0;
  transition: none;
}

.search-input::placeholder { color: var(--muted-foreground); opacity: 0.5; }

.search-clear-btn {
  background: transparent; border: none;
  color: var(--muted-foreground);
  cursor: pointer; padding: 2px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center;
  flex-shrink: 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.search-clear-btn:hover { color: var(--foreground); }
.search-clear-btn:focus-visible { outline: 2px solid var(--ring); outline-offset: 1px; }

/* ── 17. FILTER BAR ───────────────────────────────────────── */
.filter-bar {
  display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--secondary) 40%, transparent);
}

.filter-group { display: flex; align-items: center; gap: 0.375rem; }

.filter-group--right { margin-left: auto; display: flex; gap: 0.625rem; }

.filter-label {
  font-family: var(--font-mono); font-size: 0.5625rem;
  letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--muted-foreground); opacity: 0.7;
  white-space: nowrap;
}

.filter-label--checkbox {
  display: flex; align-items: center; gap: 0.3rem;
  cursor: pointer; opacity: 1;
  font-family: var(--font-mono); font-size: 0.6875rem;
  text-transform: none; letter-spacing: 0;
  color: var(--muted-foreground);
  transition: color var(--dur-fast) var(--ease-out);
}

.filter-label--checkbox:hover { color: var(--foreground); }

.filter-select {
  font-size: 0.6875rem;
  height: 1.625rem;
  padding: 0 1.75rem 0 0.5rem;
}

.filter-checkbox {
  width: 12px; height: 12px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* ── 18. RESULTS ──────────────────────────────────────────── */
.results-scroll {
  flex: 1; overflow-y: auto;
  padding: 0.5rem 0;
}

.results-scroll::-webkit-scrollbar       { width: 4px; }
.results-scroll::-webkit-scrollbar-track { background: transparent; }
.results-scroll::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 2px; }

.preview-empty {
  min-height: 240px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 0.625rem; text-align: center; padding: 2rem;
}

.preview-empty-icon { color: var(--muted-foreground); opacity: 0.3; }

.preview-empty p {
  font-size: 0.75rem; color: var(--muted-foreground);
  max-width: 28ch; line-height: 1.55;
}

.result-list { list-style: none; padding: 0 0.75rem 0.5rem; display: flex; flex-direction: column; gap: 0.375rem; }

.result-card {
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.875rem;
  cursor: default;
  animation: fade-up 0.2s var(--ease-out) both;
  transition:
    border-color var(--dur-fast) var(--ease-out),
    background   var(--dur-fast) var(--ease-out);
}

.result-card:hover {
  border-color: var(--ring);
  background: color-mix(in srgb, var(--secondary) 80%, var(--accent));
}

.result-card-header {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 0.375rem;
}

.result-doc-name {
  font-family: var(--font-mono); font-size: 0.6875rem;
  font-weight: 500; color: var(--muted-foreground);
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.result-score {
  font-family: var(--font-mono); font-size: 0.5625rem;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--stat-sections-fg);
  background: var(--stat-sections-bg);
  border-radius: 999px;
  padding: 0.1em 0.5em;
  flex-shrink: 0;
}

.result-snippet {
  font-family: var(--font-mono); font-size: 0.75rem;
  font-weight: 300; line-height: 1.7;
  color: var(--foreground);
  white-space: pre-wrap; word-break: break-word;
}

.result-snippet mark {
  background: var(--highlight-bg);
  color: var(--highlight-fg);
  border-radius: 2px;
  padding: 0 0.1em;
  font-style: normal;
}

.result-meta {
  margin-top: 0.35rem;
  font-family: var(--font-mono); font-size: 0.5625rem;
  color: var(--muted-foreground); opacity: 0.6;
}

/* Stagger result cards */
.result-card:nth-child(1)  { animation-delay: 0.02s; }
.result-card:nth-child(2)  { animation-delay: 0.04s; }
.result-card:nth-child(3)  { animation-delay: 0.06s; }
.result-card:nth-child(4)  { animation-delay: 0.08s; }
.result-card:nth-child(5)  { animation-delay: 0.10s; }
.result-card:nth-child(6)  { animation-delay: 0.12s; }
.result-card:nth-child(7)  { animation-delay: 0.14s; }
.result-card:nth-child(8)  { animation-delay: 0.16s; }

/* ── 19. RESULT FOOTER ────────────────────────────────────── */
.result-footer {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--border);
}

.result-count-text {
  font-family: var(--font-mono); font-size: 0.6875rem;
  color: var(--muted-foreground);
}

.result-time-text {
  font-family: var(--font-mono); font-size: 0.5625rem;
  color: var(--muted-foreground); opacity: 0.5;
}

/* ── 20. LIVE DOT ─────────────────────────────────────────── */
.live-dot {
  display: inline-block; width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--stat-sections-fg);
  animation: live-pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes live-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

/* ── 21. FOOTER ───────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  font-size: 0.6875rem; color: var(--muted-foreground);
}

.site-footer-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex; align-items: center;
  justify-content: space-between; gap: 1rem;
}

.site-footer-inner p { opacity: 0.5; }

.footer-link {
  font-family: var(--font-mono); font-size: 0.6875rem;
  color: var(--muted-foreground); text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.35rem;
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 0.25em 0.65em;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.footer-link:hover { background: var(--secondary); color: var(--foreground); border-color: var(--ring); }

/* ── 22. VERSION + CHANGELOG ──────────────────────────────── */
.version-tag {
  font-family: var(--font-mono); font-size: 0.6875rem;
  font-weight: 400; letter-spacing: 0.04em;
  color: var(--muted-foreground);
  background: transparent; border: none;
  padding: 0.2em 0.5em; border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}
.version-tag:hover {
  color: var(--foreground); background: var(--secondary);
  text-decoration: underline dotted; text-underline-offset: 3px;
}
.version-tag:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.changelog-panel {
  border-top: 1px solid var(--border);
  background: var(--card);
  overflow: hidden;
  max-height: 0; opacity: 0;
  transition:
    max-height var(--dur-mid) var(--ease-out),
    opacity    var(--dur-mid) var(--ease-out);
}

.changelog-panel:not([hidden]) { max-height: 480px; opacity: 1; }
.changelog-panel[hidden] { display: block !important; visibility: visible; pointer-events: none; }

.changelog-inner { max-width: 1280px; margin: 0 auto; padding: 1rem 1.5rem 1.25rem; }

.changelog-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; margin-bottom: 0.875rem; padding-bottom: 0.625rem;
  border-bottom: 1px solid var(--border);
}

.changelog-title {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: 0.75rem; font-weight: 600; color: var(--foreground);
}

.changelog-gh-link {
  display: inline-flex; align-items: center; gap: 0.3em;
  font-family: var(--font-mono); font-size: 0.6875rem;
  color: var(--muted-foreground); text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.changelog-gh-link:hover { color: var(--foreground); }

.changelog-content {
  overflow-y: auto; max-height: 340px;
  display: flex; flex-direction: column; gap: 1.25rem;
}
.changelog-content::-webkit-scrollbar       { width: 4px; }
.changelog-content::-webkit-scrollbar-track { background: transparent; }
.changelog-content::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 2px; }

.changelog-release        { display: flex; flex-direction: column; gap: 0.375rem; }
.changelog-release-header { display: flex; align-items: baseline; gap: 0.625rem; }
.changelog-version  { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; color: var(--foreground); }
.changelog-date     { font-family: var(--font-mono); font-size: 0.625rem; color: var(--muted-foreground); }
.changelog-latest-badge {
  font-family: var(--font-mono); font-size: 0.5625rem; font-weight: 500;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--stat-sections-fg); background: var(--stat-sections-bg);
  border-radius: 999px; padding: 0.1em 0.55em;
}
.changelog-items { list-style: none; display: flex; flex-direction: column; gap: 0.2rem; }
.changelog-item {
  font-family: var(--font-mono); font-size: 0.75rem;
  font-weight: 300; color: var(--muted-foreground); line-height: 1.5;
  display: flex; gap: 0.5rem;
}
.changelog-item::before { content: '—'; color: var(--ring); flex-shrink: 0; }

/* ── 23. UTILITY ──────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── 24. PAGE LOAD ────────────────────────────────────────── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.site-header  { animation: fade-up 0.3s  var(--ease-out) both; }
.pane--input  { animation: fade-up 0.35s 0.05s var(--ease-out) both; }
.pane--output { animation: fade-up 0.35s 0.10s var(--ease-out) both; }
.site-footer  { animation: fade-up 0.3s  0.15s var(--ease-out) both; }

/* ── 25. RESPONSIVE ───────────────────────────────────────── */
@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 1rem; gap: 0.875rem; align-items: start;
  }
}

@media (max-width: 560px) {
  .header-inner  { padding: 0 1rem; height: 48px; }
  .brand-tagline { display: none; }
  .app-shell     { padding: 0.75rem; gap: 0.75rem; }
  .btn           { height: 1.875rem; font-size: 0.75rem; }
  #stats-bar     { grid-template-columns: repeat(3, 1fr); }
  .filter-bar    { gap: 0.5rem; }
  .filter-group--right { margin-left: 0; width: 100%; }
  .site-footer-inner { flex-direction: column; align-items: flex-start; gap: 0.5rem; padding: 0.75rem 1rem; }
}

/* ── 26. REDUCED MOTION ───────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}