/* ─── Design Tokens ─────────────────────────────────────────────────────────── */
/*
 * Palette — "Feeling Blue" stone theme
 * #3D5A73  #2F3D40  #455559  #28403D  #182625
 */

:root,
[data-theme="light"] {
  /* Light mode: pale carved stone — neumorphic dual-shadow */
  /* Base #edf1f0 │ Dark-shadow #c1c8c6 │ Light-shadow #ffffff */
  --bg:             #edf1f0;
  --bg-elevated:    #edf1f0;
  --bg-inset:       #edf1f0;
  --surface:        rgba(237, 241, 240, 0.97);
  --surface-raised: #edf1f0;
  --ink:            #182625;
  --ink-2:          #28403D;
  --ink-muted:      #455559;
  --ink-faint:      #7a9090;
  --accent:         #3D5A73;
  --accent-soft:    rgba(61, 90, 115, 0.12);
  --accent-glow:    rgba(61, 90, 115, 0.06);
  --border:         rgba(69, 85, 89, 0.08);
  --border-strong:  rgba(69, 85, 89, 0.14);
  --shadow-raise:   8px 8px 18px rgba(0,0,0,0.18), -5px -5px 14px rgba(255,255,255,0.9);
  --shadow-raise-sm: 5px 5px 11px rgba(0,0,0,0.16), -3px -3px 9px rgba(255,255,255,0.85);
  --shadow-raise-xs: 3px 3px 7px rgba(0,0,0,0.13), -2px -2px 5px rgba(255,255,255,0.8);
  --shadow-inset:   inset 5px 5px 12px rgba(0,0,0,0.17), inset -3px -3px 9px rgba(255,255,255,0.85);
  --shadow-inset-sm: inset 3px 3px 8px rgba(0,0,0,0.14), inset -2px -2px 6px rgba(255,255,255,0.8);
  --shadow-focus:   0 0 0 3px rgba(61, 90, 115, 0.22);
  --shadow-sm:      var(--shadow-raise-sm);
  --shadow-md:      var(--shadow-raise);
  --shadow-lg:      var(--shadow-raise);
  --shadow-plaque:  var(--shadow-raise-sm);
  --code-bg:        #d6dfdd;
  --code-border:    rgba(69, 85, 89, 0.10);
  --reader-bg:      #edf1f0;
  --kbd-bg:         rgba(24, 38, 36, 0.07);
  --kbd-border:     rgba(69, 85, 89, 0.14);
  --nav-bg:         rgba(237, 241, 240, 0.97);
  --r-xs: 4px;  --r-sm: 6px;  --r-md: 10px;  --r-lg: 14px;  --r-xl: 20px;

  /* Syntax highlighting — muted stone-toned */
  --syn-keyword:    #2F5577;
  --syn-string:     #2a5c48;
  --syn-comment:    #7a9090;
  --syn-number:     #2a4d66;
  --syn-function:   #1f4a66;
  --syn-type:       #2a4d66;
  --syn-attr:       #4a5c38;
  --syn-variable:   #182625;
  --syn-operator:   #3D5A73;
  --syn-punct:      #455559;
  --syn-meta:       #6a7e7c;
  --syn-regexp:     #2a5c48;
  --syn-tag:        #265c40;
  --syn-deleted:    #7a2a2a;
  --syn-inserted:   #2a5c40;

  /* CodeMirror editor tokens */
  --cm-bg:          #d8e0de;
  --cm-fg:          #182625;
  --cm-gutter-bg:   #cdd7d5;
  --cm-gutter-fg:   #7a9090;
  --cm-cursor:      #182625;
  --cm-selection:   rgba(61, 90, 115, 0.15);
  --cm-active-line: rgba(24, 38, 36, 0.04);

  color-scheme: light;
}

[data-theme="dark"] {
  /* Dark mode: carved stone — deep teal-slate neumorphic */
  /* Base #182625 │ Dark-shadow #0c1614 │ Light-shadow #243937 */
  --bg:             #182625;
  --bg-elevated:    #182625;
  --bg-inset:       #182625;
  --surface:        rgba(24, 38, 37, 0.97);
  --surface-raised: #182625;
  --ink:            #c5d2d0;
  --ink-2:          #9eb0ad;
  --ink-muted:      #6e8583;
  --ink-faint:      #3e5452;
  --accent:         #7da8c4;
  --accent-soft:    rgba(125, 168, 196, 0.14);
  --accent-glow:    rgba(125, 168, 196, 0.07);
  --border:         rgba(69, 85, 89, 0.15);
  --border-strong:  rgba(69, 85, 89, 0.28);
  --shadow-raise:    8px 8px 20px rgba(0,0,0,0.78), -4px -4px 12px rgba(255,255,255,0.04);
  --shadow-raise-sm: 5px 5px 13px rgba(0,0,0,0.70), -2px -2px 8px rgba(255,255,255,0.04);
  --shadow-raise-xs: 3px 3px 8px rgba(0,0,0,0.62), -1px -1px 5px rgba(255,255,255,0.04);
  --shadow-inset:    inset 5px 5px 14px rgba(0,0,0,0.85), inset -3px -3px 9px rgba(0,0,0,0.45);
  --shadow-inset-sm: inset 3px 3px 9px rgba(0,0,0,0.75), inset -2px -2px 5px rgba(0,0,0,0.35);
  --shadow-focus:   0 0 0 3px rgba(125, 168, 196, 0.32);
  --shadow-sm:      var(--shadow-raise-sm);
  --shadow-md:      var(--shadow-raise);
  --shadow-lg:      var(--shadow-raise);
  --shadow-plaque:  var(--shadow-raise-sm);
  --code-bg:        #111e1c;
  --code-border:    rgba(69, 85, 89, 0.18);
  --reader-bg:      #182625;
  --kbd-bg:         rgba(0, 0, 0, 0.28);
  --kbd-border:     rgba(69, 85, 89, 0.28);
  --nav-bg:         rgba(14, 22, 20, 0.98);

  /* Syntax highlighting — muted stone-toned */
  --syn-keyword:    #8fb5cc;
  --syn-string:     #89a89a;
  --syn-comment:    #4a6260;
  --syn-number:     #7aa0b8;
  --syn-function:   #9cbccf;
  --syn-type:       #7aa0b8;
  --syn-attr:       #8fb0a8;
  --syn-variable:   #b0c4c2;
  --syn-operator:   #7a9ea0;
  --syn-punct:      #6a8a88;
  --syn-meta:       #4a6260;
  --syn-regexp:     #89a89a;
  --syn-tag:        #6a9e8e;
  --syn-deleted:    #9e6666;
  --syn-inserted:   #6e9e8a;

  --cm-bg:          #0f1a18;
  --cm-fg:          #b0c4c2;
  --cm-gutter-bg:   #0f1a18;
  --cm-gutter-fg:   #3e5452;
  --cm-cursor:      #c5d2d0;
  --cm-selection:   rgba(61, 90, 115, 0.25);
  --cm-active-line: rgba(255, 255, 255, 0.03);

  color-scheme: dark;
}

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

html {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
}

html {
  overflow-x: clip;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "DM Sans", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Stone texture overlay — adds subtle grain to the stone surface */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.038;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 300px 300px;
}

[data-theme="light"] body::before { opacity: 0.022; }

/* ─── Page Shell ─────────────────────────────────────────────────────────────── */
.page-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  padding: 0 clamp(12px, 2.5vw, 48px) 48px;
  margin: 0 auto;
}

/* Staggered entry — hero elements appear sequentially */
.hero-text {
  animation: pageIn 0.35s ease both;
  animation-delay: 0.05s;
}

.search-form {
  animation: pageIn 0.35s ease both;
  animation-delay: 0.12s;
}

.bento-card {
  animation: pageIn 0.35s ease both;
}

.bento-card:nth-child(1) { animation-delay: 0.20s; }
.bento-card:nth-child(2) { animation-delay: 0.24s; }
.bento-card:nth-child(3) { animation-delay: 0.28s; }
.bento-card:nth-child(4) { animation-delay: 0.32s; }
.bento-card:nth-child(5) { animation-delay: 0.36s; }

.filter-bar {
  animation: pageIn 0.35s ease both;
  animation-delay: 0.38s;
}

/* ─── Sticky Top Bar ─────────────────────────────────────────────────────────── */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 12px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  user-select: none;
  flex-shrink: 0;
}

.logo-mark svg { color: var(--accent); flex-shrink: 0; }

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.top-nav { display: flex; gap: 2px; }

.nav-link {
  padding: 6px 14px;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--bg);
  border: none;
  border-radius: var(--r-sm);
  cursor: pointer;
  box-shadow: var(--shadow-raise-xs);
  transition: color 110ms, box-shadow 110ms;
  letter-spacing: -0.01em;
}

.nav-link:hover { color: var(--ink); box-shadow: var(--shadow-raise-sm); }
.nav-link.active { color: var(--accent); box-shadow: var(--shadow-inset-sm); border-radius: var(--r-xs); }

/* ─── Theme Toggle ───────────────────────────────────────────────────────────── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: none;
  border-radius: var(--r-sm);
  background: var(--bg);
  box-shadow: var(--shadow-raise-xs);
  color: var(--ink-muted);
  cursor: pointer;
  transition: color 150ms, box-shadow 150ms;
  flex-shrink: 0;
}

.theme-toggle:hover { color: var(--accent); box-shadow: var(--shadow-raise-sm); }

.theme-toggle svg {
  width: 17px; height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

/* ─── Hero ───────────────────────────────────────────────────────────────────── */
.hero {
  padding: 56px 0 36px;
  position: relative;
}

/* No atmospheric glow — clean stone surface */
.hero::before { display: none; }
.hero::after  { display: none; }

.hero > * { position: relative; z-index: 1; }

.hero-text { margin-bottom: 32px; }

h1 {
  margin: 0;
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(2.8rem, 5.5vw, 5rem);
  line-height: 1.0;
  letter-spacing: -0.04em;
  color: var(--ink);
}

[data-theme="dark"] .hero-text h1 {
  background: linear-gradient(135deg, #f4f4f5 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  max-width: 72ch;
  margin: 14px 0 0;
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--ink-muted);
}

/* ─── Search ─────────────────────────────────────────────────────────────────── */
.search-form { margin-bottom: 28px; }

.search-frame { position: relative; }

.search-icon {
  position: absolute;
  top: 50%;
  left: 20px;
  width: 19px;
  height: 19px;
  fill: var(--ink-faint);
  transform: translateY(-50%);
  pointer-events: none;
  transition: fill 180ms;
}

.search-frame:focus-within .search-icon { fill: var(--accent); }

.search-kbd {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--r-xs);
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  color: var(--ink-faint);
  pointer-events: none;
  letter-spacing: 0;
}

#query-input {
  width: 100%;
  border: none;
  border-radius: var(--r-md);
  padding: 0 80px 0 52px;
  height: 56px;
  font: inherit;
  font-size: 1rem;
  background: var(--bg-inset);
  color: var(--ink);
  box-shadow: var(--shadow-inset);
  transition: box-shadow 200ms;
}

#query-input::placeholder { color: var(--ink-faint); }

#query-input:focus {
  outline: none;
  box-shadow: var(--shadow-focus), var(--shadow-inset);
}

/* ─── Bento Stats ────────────────────────────────────────────────────────────── */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0 0;
}

.bento-card {
  padding: 16px 18px 14px;
  border: none;
  border-radius: var(--r-md);
  background: var(--bg);
  box-shadow: var(--shadow-raise-sm);
  transition: box-shadow 160ms ease, background 160ms ease;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

button.bento-card {
  appearance: none;
  -webkit-appearance: none;
  padding: 16px 18px 14px;
}

.bento-card:hover {
  box-shadow: var(--shadow-raise);
}

.bento-card.active {
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm);
  color: var(--accent);
}

.bento-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.bento-value {
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.65rem;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.bento-primary .bento-value { color: var(--accent); }

/* bento-card dark overrides handled by token system */

.bento-label {
  font-size: 0.7rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  white-space: nowrap;
}

.bento-date .bento-value {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: normal;
  line-height: 1.4;
  color: var(--ink-2);
}

.bento-date .bento-label {
  font-size: 0.65rem;
  color: var(--ink-faint);
}

/* ─── Filter Bar ─────────────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 32px;
  padding-top: 18px;
}

.scope-row { display: flex; flex-wrap: wrap; gap: 5px; }

.filter-bar .scope-row {
  width: 100%;
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: none;
  box-shadow: 0 1px 0 rgba(0,0,0,0.30);
}

.scope-chip {
  padding: 6px 13px;
  border: none;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  line-height: 1;
  box-shadow: var(--shadow-raise-xs);
  transition: box-shadow 120ms ease, color 90ms ease;
}

.scope-chip:hover { color: var(--ink); box-shadow: var(--shadow-raise-sm); }
.scope-chip:active { box-shadow: var(--shadow-inset-sm); opacity: 0.9; }
.scope-chip.active { background: var(--bg); color: var(--accent); box-shadow: var(--shadow-inset-sm); }

.suggestion-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  overflow-x: auto;
  padding-right: 16px;
  position: relative;
}

.suggestion-strip::after {
  content: "";
  position: sticky;
  right: 0;
  top: 0;
  bottom: 0;
  pointer-events: none;
  width: 40px;
  background: linear-gradient(to right, transparent, var(--bg));
  margin-left: -40px;
  z-index: 10;
}

.suggestion-button {
  padding: 4px 10px;
  border: none;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-faint);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  box-shadow: var(--shadow-raise-xs);
  transition: color 110ms, box-shadow 140ms;
}

.suggestion-button:hover { color: var(--accent); box-shadow: var(--shadow-raise-sm); }

/* ─── Main Layout ────────────────────────────────────────────────────────────── */
.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 28px;
  align-items: start;
  padding-top: 20px;
  padding-bottom: 18px;
  flex: 1;
}

/* ─── Results Toolbar ────────────────────────────────────────────────────────── */
.results-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

#results-summary {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
  font-weight: 500;
}

.results-meta {
  color: var(--ink-faint);
  font-size: 0.75rem;
  margin: 0;
  font-family: "DM Sans", system-ui, -apple-system, sans-serif;
  white-space: nowrap;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

/* ─── Empty State ────────────────────────────────────────────────────────────── */
.empty-state {
  padding: 44px 32px;
  border: none;
  border-radius: var(--r-lg);
  background: var(--bg);
  box-shadow: var(--shadow-raise-sm);
  text-align: center;
}

.empty-state h2 {
  margin: 0 0 8px;
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--ink-2);
}

.empty-state p { color: var(--ink-muted); margin: 0; }

/* ─── Result Card ────────────────────────────────────────────────────────────── */
.result-card {
  display: flex;
  flex-direction: column;
  padding: 14px 16px;
  border: none;
  border-radius: var(--r-sm);
  background: var(--bg);
  cursor: pointer;
  box-shadow: var(--shadow-raise-sm);
  transition: box-shadow 140ms ease-out;
  animation: cardIn 0.18s ease both;
}

.result-card:hover {
  box-shadow: var(--shadow-raise);
}

.result-card:active { opacity: 0.85; }

.result-card.active {
  box-shadow: var(--shadow-inset-sm);
  background: var(--bg);
}

.load-more-item {
  display: flex;
  justify-content: center;
  padding: 18px 0 10px;
}

.load-more-indicator {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  color: var(--ink-faint);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.load-more-indicator::before,
.load-more-indicator::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--border);
}

.load-more-indicator.loading {
  color: var(--accent);
}

.load-more-btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--r-md);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--shadow-raise-sm);
  transition: box-shadow 140ms, color 140ms;
}

.load-more-btn:hover {
  box-shadow: var(--shadow-raise);
  color: var(--accent);
}

.load-more-btn:active {
  transform: scale(0.98);
}

.result-topline {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
}

.result-path {
  display: none;
  margin: 0 0 4px;
  font-size: 0.72rem;
  color: var(--ink-faint);
  font-family: "JetBrains Mono", monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 52ch;
}

.result-title {
  margin: 0;
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.25;
  color: var(--ink);
}

.result-link { color: inherit; text-decoration: none; transition: color 140ms; }
.result-link:hover { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 2px; }

.result-scope-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: var(--r-xs);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 1px;
  background: var(--bg);
  color: var(--ink-faint);
  border: none;
  box-shadow: var(--shadow-raise-xs);
}

.result-scope-badge[data-scope="copilot"]   { background: var(--bg); color: var(--accent); box-shadow: var(--shadow-raise-xs); }
.result-scope-badge[data-scope="knowledge"] { background: var(--bg); color: var(--accent); box-shadow: var(--shadow-raise-xs); opacity: 0.9; }
.result-scope-badge[data-scope="archive"]   { background: var(--bg); color: var(--ink-faint); box-shadow: var(--shadow-raise-xs); }

.result-scope-badge.chip-button:hover { box-shadow: var(--shadow-raise-sm); color: var(--accent); background: var(--bg); }

.bento-date {
  cursor: default;
}

.bento-date:hover {
  transform: none;
}

.result-snippet {
  margin: 8px 0 10px;
  line-height: 1.55;
  color: var(--ink-muted);
  font-size: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.result-pills { display: flex; flex-wrap: wrap; gap: 4px; }

.result-pill, .keyword-pill, .meta-pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  font-size: 0.74rem;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-faint);
  font-weight: 500;
  border: none;
  box-shadow: var(--shadow-raise-xs);
}

.chip-button {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  line-height: 1.2;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms, box-shadow 120ms;
}

.chip-button:hover { box-shadow: var(--shadow-raise-sm); }

.chip-button:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus), var(--shadow-raise-xs);
}

.chip-button:active { opacity: 0.8; }

.result-pill.chip-button:hover,
.keyword-pill.chip-button:hover,
.meta-pill.chip-button:hover {
  background: var(--bg);
  color: var(--ink-muted);
  box-shadow: var(--shadow-raise-sm);
}

.meta-pill-path {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ─── Read Article Button ────────────────────────────────────────────────────── */
.read-article-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: auto;
  padding: 6px 13px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-muted);
  background: transparent;
  border: none;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color 130ms, background 130ms;
  letter-spacing: -0.01em;
}

.read-article-btn:hover { color: var(--ink); background: var(--bg-inset); }

/* ─── Preview Column ─────────────────────────────────────────────────────────── */
.preview-column-shell {
  position: sticky;
  top: 72px;
  align-self: start;
  padding-bottom: 10px;
}

.preview-column {
  max-height: calc(100vh - 96px);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  background: var(--bg-inset);
  border: none;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-inset);
  padding-bottom: 14px;
}

.preview-column::-webkit-scrollbar { width: 5px; }
.preview-column::-webkit-scrollbar-track { background: transparent; }
.preview-column::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}
.preview-column::-webkit-scrollbar-thumb:hover { background: var(--ink-faint); }

.preview-scroll-fade {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  height: 32px;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent, var(--bg-inset));
  border-radius: 0 0 var(--r-md) var(--r-md);
  opacity: 0;
  transition: opacity 200ms;
}

.preview-column.is-scrollable .preview-scroll-fade { opacity: 1; }
.preview-column.is-scrolled-end .preview-scroll-fade { opacity: 0; }
[data-theme="dark"] .preview-scroll-fade { background: linear-gradient(to bottom, transparent, var(--bg-inset)); }

.preview-card {
  padding: 20px 22px;
  border-radius: inherit;
  background: transparent;
  border-top: 2px solid var(--border-strong);
}

.preview-kicker {
  margin: 0 0 6px;
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

.preview-card h2 {
  margin: 0 0 10px;
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.2;
  color: var(--ink);
}

.preview-meta { display: flex; flex-wrap: wrap; gap: 5px; margin: 10px 0 12px; }

.preview-body {
  line-height: 1.65;
  color: var(--ink-muted);
  font-size: 0.875rem;
}

.preview-section-title {
  margin: 16px 0 7px;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 700;
}

.preview-links { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 14px; }

.preview-link {
  padding: 7px 13px;
  font: inherit;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink-2);
  border: none;
  border-radius: var(--r-sm);
  background: var(--bg);
  box-shadow: var(--shadow-raise-xs);
  transition: box-shadow 110ms, color 110ms;
}

.preview-link:hover { box-shadow: var(--shadow-raise-sm); color: var(--accent); }

.preview-keywords, .preview-headings { display: flex; flex-wrap: wrap; gap: 5px; }

.preview-related { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 6px; }

.related-trigger {
  padding: 6px 12px;
  font: inherit;
  font-size: 0.8rem;
  border: none;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-muted);
  cursor: pointer;
  box-shadow: var(--shadow-raise-xs);
  transition: color 110ms, box-shadow 140ms;
}

.related-trigger:hover { color: var(--accent); box-shadow: var(--shadow-raise-sm); }

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--r-sm);
  padding: 8px 16px;
  font-size: 0.875rem;
  transition: transform 100ms, background 130ms, color 130ms, border-color 130ms;
  letter-spacing: -0.01em;
}

.btn:active { transform: scale(0.97); }

.btn-ghost {
  color: var(--ink-muted);
  background: var(--bg);
  border: none;
  box-shadow: var(--shadow-raise-sm);
}

.btn-ghost:hover { color: var(--ink); box-shadow: var(--shadow-raise); background: var(--bg); }

.btn-primary {
  color: #fff;
  background: var(--accent);
  border: none;
  box-shadow: var(--shadow-raise-sm);
}

.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, #000); box-shadow: var(--shadow-raise); }

#reader-back {
  background: var(--bg);
  color: var(--ink-muted);
  border: none;
  box-shadow: var(--shadow-raise-sm);
}

#reader-back:hover { color: var(--accent); box-shadow: var(--shadow-raise); }

.btn-sm { padding: 6px 13px; font-size: 0.82rem; border-radius: var(--r-sm); }

/* ─── Article Reader ─────────────────────────────────────────────────────────── */
.reader-column { grid-column: 1 / -1; }
.reader-column.hidden { display: none; }

/* ─── Reader mode — collapse browse chrome ───────────────────────────────────── */
.page-shell:has(#reader-column:not(.hidden)) .hero,
.page-shell:has(#reader-column:not(.hidden)) .search-form,
.page-shell:has(#reader-column:not(.hidden)) .bento-grid,
.page-shell:has(#reader-column:not(.hidden)) .filter-bar {
  display: none;
}

.page-shell:has(#reader-column:not(.hidden)) .main-layout {
  padding-top: 4px;
}

.reader-toolbar {
  position: sticky;
  top: 56px;
  z-index: 120;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  margin: 0 0 4px;
  padding: 10px 16px;
  background: var(--bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: none;
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-raise-sm);
}

.reader-body {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 56px 48px;
  border: none;
  border-radius: var(--r-md);
  background: var(--reader-bg);
  box-shadow: var(--shadow-raise);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-2);
}

.reader-loading { color: var(--ink-muted); font-style: italic; }

.reader-body h1 {
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 24px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--border-strong);
  color: var(--ink);
}

[data-theme="dark"] .reader-body h1 {
  color: var(--ink);
}

.reader-body h2 {
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.25;
  font-style: normal;
  margin: 40px 0 14px;
  padding-top: 18px;
  color: var(--ink);
}

.reader-body h3 { font-size: 1.1rem; font-weight: 600; font-style: normal; margin: 32px 0 12px; color: var(--ink-2); }
.reader-body h4 { font-size: 0.875rem; font-weight: 700; font-style: normal; margin: 20px 0 8px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; }
.reader-body p { margin: 0 0 16px; }
.reader-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.reader-body a:hover { text-decoration-thickness: 2px; }

.see-also-label { font-size: 0.82rem; color: var(--ink-faint); font-weight: 500; margin-right: 4px; }
.see-also-link { 
  color: var(--accent); 
  text-decoration: none; 
  display: inline-flex; 
  align-items: center; 
  padding: 6px 12px; 
  background: var(--bg); 
  border: none; 
  border-radius: var(--r-xs); 
  font-weight: 500; 
  font-size: 0.9rem; 
  box-shadow: var(--shadow-raise-xs);
  transition: box-shadow 120ms, color 120ms; 
  cursor: pointer; 
}
.see-also-link:hover { 
  box-shadow: var(--shadow-raise-sm); 
  color: var(--accent); 
  text-decoration: none; 
}
.reader-body ul, .reader-body ol { margin: 0 0 16px; padding-left: 24px; }
.reader-body li { margin-bottom: 6px; }

.reader-body code {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.875em;
  padding: 2px 6px;
  border-radius: var(--r-xs);
  background: var(--code-bg);
  box-shadow: var(--shadow-inset-sm);
  color: var(--ink);
}

.reader-body pre {
  margin: 0 0 20px;
  padding: 18px 22px;
  border-radius: var(--r-md);
  background: var(--code-bg);
  border: none;
  box-shadow: var(--shadow-inset-sm);
  overflow-x: auto;
  line-height: 1.55;
}

.reader-body pre code { padding: 0; border: none; background: none; font-size: 0.84rem; }

.reader-body blockquote {
  margin: 0 0 16px;
  padding: 12px 20px;
  border: none;
  background: var(--bg);
  border-radius: var(--r-sm);
  color: var(--ink-muted);
  box-shadow: var(--shadow-inset-sm);
}

.reader-body blockquote p { margin: 0; }

.reader-body table { width: 100%; border-collapse: collapse; margin: 0 0 20px; font-size: 0.9rem; }
.reader-body th, .reader-body td { padding: 8px 12px; border: none; text-align: left; }
.reader-body th { background: var(--bg); font-weight: 700; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-muted); border-bottom: 2px solid rgba(125,168,196,0.25); }
.reader-body table tbody tr:nth-child(odd) { background: rgba(125,168,196,0.04); }
[data-theme="dark"] .reader-body table tbody tr:nth-child(odd) { background: rgba(255, 255, 255, 0.04); }
.reader-body table thead tr { border-bottom: none; }
.reader-body hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.reader-body img { max-width: 100%; height: auto; border-radius: var(--r-sm); }

/* ─── Community Content Reader ───────────────────────────────────────────────── */
.community-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 20px;
}

.community-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--r-xs);
  background: var(--accent-soft);
  color: var(--accent);
  letter-spacing: 0.03em;
  text-transform: capitalize;
  border: none;
}

.community-badge.chip-button:hover {
  background: var(--accent-glow);
  box-shadow: var(--shadow-raise-xs);
}

.community-description {
  padding: 20px 24px;
  margin: 0 0 24px;
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm), inset 4px 0 0 0 rgba(125, 168, 196, 0.35);
  border-radius: var(--r-md);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-2);
}

.community-description p { margin: 0; }

.community-callout {
  padding: 14px 20px;
  margin: 0 0 14px;
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  line-height: 1.6;
}

.community-callout strong { font-weight: 600; }

.community-callout-warning {
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm), inset 3px 0 0 0 rgba(180, 140, 60, 0.55);
  color: var(--ink-2);
}

.community-callout-info {
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm), inset 3px 0 0 0 rgba(125, 168, 196, 0.45);
  color: var(--ink-2);
}

.community-detail {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.community-detail strong { color: var(--ink-2); }

.community-avoid { color: #a63a3a; }
[data-theme="dark"] .community-avoid { color: #c97070; }

.community-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 24px;
}

.community-topic {
  display: inline-flex;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-muted);
  border: none;
  box-shadow: var(--shadow-raise-xs);
}

[data-theme="dark"] .community-topic { color: var(--ink-muted); background: var(--bg); box-shadow: var(--shadow-raise-xs); }

.community-topic.chip-button:hover {
  color: var(--accent);
  box-shadow: var(--shadow-raise-sm);
}

[data-theme="dark"] .community-topic.chip-button:hover {
  color: var(--accent);
  box-shadow: var(--shadow-raise-sm);
}

.community-evidence {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 0 24px;
}

.community-evidence-link,
.community-evidence-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border: none;
  border-radius: var(--r-sm);
  background: var(--bg);
  box-shadow: var(--shadow-raise-sm);
  font-size: 0.88rem;
  color: var(--ink-2);
  text-decoration: none;
  transition: box-shadow 140ms, color 140ms;
}

.community-evidence-link:hover {
  box-shadow: var(--shadow-raise);
  color: var(--accent);
}

.community-source-type {
  margin-left: auto;
  padding: 2px 8px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--r-xs);
  background: var(--bg);
  color: var(--ink-faint);
  flex-shrink: 0;
  border: none;
  box-shadow: var(--shadow-raise-xs);
}

.community-resources {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
}

.community-resource-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: none;
  border-radius: var(--r-sm);
  background: var(--bg);
  box-shadow: var(--shadow-raise-xs);
  font-size: 0.88rem;
  color: var(--ink-2);
  text-decoration: none;
  transition: box-shadow 140ms, color 140ms;
}

.community-resource-link:hover { border-color: var(--accent); color: var(--accent); }

/* ─── About Page ─────────────────────────────────────────────────────────────── */
.page-hidden { display: none; }

/* Fill remaining flex space so footer doesn't float with sticky-footer layout */
#page-about { flex: 1; }

.about-page {
  max-width: 860px;
  margin-inline: auto;
  padding: 48px 0 48px;
  animation: pageIn 0.3s ease both;
}

.breadcrumb {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 20px;
  opacity: 0.9;
}

.about-page h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.about-page h2 {
  font-family: "Saira", system-ui, sans-serif;
  font-weight: 600;
  font-size: 1.2rem;
  margin: 40px 0 12px;
  padding: 0 0 10px;
  border-bottom: none;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.about-page h2:first-of-type,
.about-body h2:first-of-type {
  border-bottom: none;
}

.about-body { font-size: 1rem; line-height: 1.75; color: var(--ink-muted); }

.about-body > p:first-child {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--ink-2);
  padding: 20px 24px;
  border: none;
  background: var(--bg);
  border-radius: var(--r-md);
  margin-bottom: 32px;
  box-shadow: var(--shadow-inset);
}

.about-body p { margin: 0 0 16px; }

.about-body ul {
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 0 24px;
}

.about-body li {
  padding: 12px 16px;
  border: none;
  border-radius: var(--r-md);
  background: var(--bg);
  box-shadow: var(--shadow-raise-xs);
  margin-bottom: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  transition: box-shadow 120ms ease;
}

[data-theme="dark"] .about-body li {
  box-shadow: var(--shadow-raise-xs);
}

.about-body li strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 2px;
  color: var(--ink);
}

.about-body strong { color: var(--ink); font-weight: 600; }

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
.site-footer {
  margin-top: auto;
  padding: 32px 0 28px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
  font-family: "DM Sans", system-ui, sans-serif;
  letter-spacing: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 4px;
  padding-left: 0;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--bg);
  border: none;
  text-decoration: none;
  border-radius: var(--r-sm);
  cursor: pointer;
  box-shadow: var(--shadow-raise-xs);
  transition: color 120ms, box-shadow 120ms;
}

.footer-link:hover {
  color: var(--accent);
  box-shadow: var(--shadow-raise-sm);
  text-decoration: none;
}

.footer-link.active {
  color: var(--accent);
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm);
}

.footer-link svg {
  display: block;
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* ─── Utilities ──────────────────────────────────────────────────────────────── */
.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;
}

.hidden { display: none !important; }

mark {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 0.1em;
  border-radius: 2px;
}

[data-theme="dark"] mark {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ─── Animations ─────────────────────────────────────────────────────────────── */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(3px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

/* Bento loading shimmer — applied via .bento-loading class on .bento-grid */
.bento-grid.bento-loading .bento-value {
  display: block;
  width: 70px;
  height: 26px;
  border-radius: 6px;
  color: transparent;
  background: linear-gradient(
    90deg,
    var(--bg-inset) 0%,
    color-mix(in srgb, var(--border) 80%, transparent) 40%,
    var(--bg-inset) 80%
  );
  background-size: 800px 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

.bento-grid.bento-loading .bento-primary .bento-value { width: 90px; }
.bento-grid.bento-loading .bento-card:nth-child(2) .bento-value { animation-delay: 0.1s; }
.bento-grid.bento-loading .bento-card:nth-child(3) .bento-value { animation-delay: 0.2s; }
.bento-grid.bento-loading .bento-card:nth-child(4) .bento-value { animation-delay: 0.3s; }
.bento-grid.bento-loading .bento-card:nth-child(5) .bento-value { animation-delay: 0.4s; }

@keyframes skeletonFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Skeleton Loading Cards ─────────────────────────────────────────────────── */
.skeleton-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.skeleton-card {
  padding: 15px 18px;
  border: none;
  border-radius: var(--r-md);
  background: var(--bg);
  box-shadow: var(--shadow-raise-sm);
  animation: skeletonFadeIn 0.32s ease both;
}

.skeleton-line {
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(
    90deg,
    var(--bg-inset) 0%,
    color-mix(in srgb, var(--border) 60%, transparent) 40%,
    var(--bg-inset) 80%
  );
  background-size: 800px 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

.skeleton-line-short {
  width: 30%;
  height: 9px;
  margin-bottom: 10px;
  opacity: 0.5;
}

.skeleton-line-title {
  width: 70%;
  height: 16px;
  margin-bottom: 12px;
}

.skeleton-line-body {
  width: 92%;
  margin-bottom: 6px;
}

.skeleton-line-body-short {
  width: 58%;
  margin-bottom: 12px;
}

.skeleton-pills {
  display: flex;
  gap: 6px;
}

.skeleton-pill {
  width: 64px;
  height: 22px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    var(--bg-inset) 0%,
    color-mix(in srgb, var(--border) 60%, transparent) 40%,
    var(--bg-inset) 80%
  );
  background-size: 800px 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

.skeleton-pill:nth-child(2) { width: 80px; animation-delay: 0.15s; }
.skeleton-pill:nth-child(3) { width: 56px; animation-delay: 0.3s; }

/* ─── Load More Indicators ───────────────────────────────────────────────────── */
.load-more-count {
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

.load-end-indicator {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  color: var(--ink-faint);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0;
  animation: skeletonFadeIn 0.4s ease 0.1s forwards;
}

.load-end-indicator::before,
.load-end-indicator::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--border);
}

/* ─── Syntax Highlighting (highlight.js overrides) ───────────────────────────── */
.hljs { background: transparent !important; color: inherit; }

.reader-body pre code.hljs,
.practice-panel pre code.hljs,
.feedback-card pre code.hljs {
  background: transparent;
  padding: 0;
}

.hljs-keyword, .hljs-selector-tag, .hljs-deletion { color: var(--syn-keyword); }
.hljs-string, .hljs-template-tag, .hljs-template-variable { color: var(--syn-string); }
.hljs-comment, .hljs-doctag { color: var(--syn-comment); font-style: italic; }
.hljs-number, .hljs-literal, .hljs-selector-id { color: var(--syn-number); }
.hljs-title.function_, .hljs-title.class_ { color: var(--syn-function); }
.hljs-type, .hljs-built_in, .hljs-builtin-name { color: var(--syn-type); }
.hljs-attr, .hljs-attribute, .hljs-selector-attr { color: var(--syn-attr); }
.hljs-variable, .hljs-params { color: var(--syn-variable); }
.hljs-operator, .hljs-selector-pseudo { color: var(--syn-operator); }
.hljs-punctuation { color: var(--syn-punct); }
.hljs-meta, .hljs-meta .hljs-keyword, .hljs-meta .hljs-string { color: var(--syn-meta); }
.hljs-regexp { color: var(--syn-regexp); }
.hljs-tag, .hljs-name { color: var(--syn-tag); }
.hljs-addition { color: var(--syn-inserted); background: rgba(34, 134, 58, 0.1); }
.hljs-section { color: var(--syn-function); font-weight: 700; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ─── CodeMirror Editor Theme ────────────────────────────────────────────────── */
.cm-s-atlas-light.CodeMirror,
.cm-s-atlas-dark.CodeMirror {
  background: var(--cm-bg);
  color: var(--cm-fg);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  border: none;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-inset);
  padding: 4px 0;
}

.cm-s-atlas-light .CodeMirror-gutters,
.cm-s-atlas-dark .CodeMirror-gutters {
  background: var(--cm-gutter-bg);
  box-shadow: 1px 0 0 rgba(0,0,0,0.35);
  padding-right: 4px;
}

.cm-s-atlas-light .CodeMirror-linenumber,
.cm-s-atlas-dark .CodeMirror-linenumber {
  color: var(--cm-gutter-fg);
  font-size: 0.78rem;
}

.cm-s-atlas-light .CodeMirror-cursor,
.cm-s-atlas-dark .CodeMirror-cursor {
  border-left-color: var(--cm-cursor);
}

.cm-s-atlas-light .CodeMirror-selected,
.cm-s-atlas-dark .CodeMirror-selected {
  background: var(--cm-selection);
}

.cm-s-atlas-light .CodeMirror-activeline-background,
.cm-s-atlas-dark .CodeMirror-activeline-background {
  background: var(--cm-active-line);
}

.cm-s-atlas-light .cm-keyword,
.cm-s-atlas-dark .cm-keyword { color: var(--syn-keyword); }
.cm-s-atlas-light .cm-string,
.cm-s-atlas-dark .cm-string { color: var(--syn-string); }
.cm-s-atlas-light .cm-comment,
.cm-s-atlas-dark .cm-comment { color: var(--syn-comment); font-style: italic; }
.cm-s-atlas-light .cm-number,
.cm-s-atlas-dark .cm-number { color: var(--syn-number); }
.cm-s-atlas-light .cm-def,
.cm-s-atlas-dark .cm-def { color: var(--syn-function); }
.cm-s-atlas-light .cm-variable,
.cm-s-atlas-dark .cm-variable { color: var(--syn-variable); }
.cm-s-atlas-light .cm-variable-2,
.cm-s-atlas-dark .cm-variable-2 { color: var(--syn-attr); }
.cm-s-atlas-light .cm-type,
.cm-s-atlas-dark .cm-type { color: var(--syn-type); }
.cm-s-atlas-light .cm-operator,
.cm-s-atlas-dark .cm-operator { color: var(--syn-operator); }
.cm-s-atlas-light .cm-builtin,
.cm-s-atlas-dark .cm-builtin { color: var(--syn-type); }
.cm-s-atlas-light .cm-meta,
.cm-s-atlas-dark .cm-meta { color: var(--syn-meta); }
.cm-s-atlas-light .cm-tag,
.cm-s-atlas-dark .cm-tag { color: var(--syn-tag); }
.cm-s-atlas-light .cm-attribute,
.cm-s-atlas-dark .cm-attribute { color: var(--syn-attr); }
.cm-s-atlas-light .cm-atom,
.cm-s-atlas-dark .cm-atom { color: var(--syn-number); }
.cm-s-atlas-light .CodeMirror-matchingbracket,
.cm-s-atlas-dark .CodeMirror-matchingbracket {
  color: var(--accent) !important;
  font-weight: 700;
  text-decoration: underline;
}

/* ─── Practice Panel — IDE-Style Interface ───────────────────────────────────── */
.reader-split {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.reader-column.practice-open .reader-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.practice-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.practice-toggle-btn.active {
  background: var(--accent);
  color: #fff;
}

.practice-panel {
  border: none;
  border-radius: var(--r-md);
  background: var(--bg-inset);
  box-shadow: var(--shadow-inset);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 112px;
  max-height: calc(100vh - 130px);
  overflow: hidden;
}

.practice-panel.hidden { display: none; }

/* ── IDE Toolbar ──────────────────────────────────────────────────────────────── */
.ide-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-inset);
  box-shadow: 0 1px 0 rgba(0,0,0,0.40);
  flex-shrink: 0;
}

.ide-toolbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ide-toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.practice-tabs {
  display: flex;
  gap: 1px;
  background: transparent;
  border-radius: 0;
  padding: 0;
}

.practice-tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 100ms, border-color 100ms;
  white-space: nowrap;
}
.practice-tab svg { opacity: 0.5; }

.practice-tab:hover { color: var(--ink); }
.practice-tab:hover svg { opacity: 0.7; }
.practice-tab.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}
.practice-tab.active svg { opacity: 1; color: var(--accent); }

/* Provider tabs */
.provider-tabs {
  display: flex;
  gap: 0;
  background: var(--bg);
  border-radius: 4px;
  padding: 2px;
  border: none;
  box-shadow: var(--shadow-inset-sm);
}
.provider-tab {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  font: inherit;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-muted);
  background: none;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: color 100ms, background 100ms;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.provider-tab:hover { color: var(--ink); }
.provider-tab.active {
  color: var(--accent);
  background: var(--bg);
  box-shadow: var(--shadow-raise-xs);
}

/* AI status */
.ai-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.68rem;
  color: var(--ink-muted);
}

.ai-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.ai-dot.ai-connected { background: #22c55e; box-shadow: 0 0 6px rgba(34, 197, 94, 0.5); }
.ai-dot.ai-warning { background: #eab308; box-shadow: 0 0 6px rgba(234, 179, 8, 0.4); }
.ai-dot.ai-disconnected { background: var(--ink-faint); }

.ai-label { white-space: nowrap; }

/* ── Control Bar ──────────────────────────────────────────────────────────────── */
.ide-control-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 12px;
  background: var(--bg-elevated);
  box-shadow: 0 1px 0 rgba(0,0,0,0.40);
  flex-shrink: 0;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.control-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* Difficulty selector */
.difficulty-selector {
  display: flex;
  gap: 0;
  border-radius: 4px;
  overflow: hidden;
  border: none;
  box-shadow: var(--shadow-inset-sm);
}

.diff-btn {
  padding: 3px 10px;
  font: inherit;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--ink-muted);
  background: var(--bg);
  border: none;
  border-right: 1px solid rgba(69,85,89,0.1);
  cursor: pointer;
  transition: all 100ms;
}
.diff-btn:last-child { border-right: none; }
.diff-btn:hover { color: var(--ink); background: var(--bg-inset); }
.diff-btn.active[data-difficulty="easy"] {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}
.diff-btn.active[data-difficulty="medium"] {
  background: rgba(234, 179, 8, 0.15);
  color: #ca8a04;
}
.diff-btn.active[data-difficulty="hard"] {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

[data-theme="dark"] .diff-btn.active[data-difficulty="easy"] { color: #4ade80; }
[data-theme="dark"] .diff-btn.active[data-difficulty="medium"] { color: #facc15; }
[data-theme="dark"] .diff-btn.active[data-difficulty="hard"] { color: #f87171; }

/* Model selector */
.model-selector {
  font: inherit;
  font-size: 0.7rem;
  padding: 3px 6px;
  border: none;
  border-radius: 4px;
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm);
  color: var(--ink);
  max-width: 150px;
  cursor: pointer;
  transition: box-shadow 100ms;
}
.model-selector:hover { box-shadow: var(--shadow-raise-xs); }
.model-selector:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── IDE Workspace ────────────────────────────────────────────────────────────── */
.ide-workspace {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

/* Problem pane */
.ide-problem-pane {
  padding: 14px 14px 10px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.35);
  max-height: 260px;
  overflow-y: auto;
}

/* Empty state */
.practice-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 32px 20px;
  text-align: center;
  color: var(--ink-muted);
}
.practice-empty-state svg { opacity: 0.4; }
.practice-empty-state h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}
.practice-empty-state p {
  margin: 0;
  font-size: 0.84rem;
  max-width: 280px;
}

/* Problem card */
.problem-card {
  border-radius: var(--r-sm);
  background: transparent;
  border: none;
  padding: 0;
}

.problem-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  padding-bottom: 10px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.30);
}

.problem-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
  flex: 1;
}

.difficulty-badge,
.language-badge {
  display: inline-flex;
  padding: 2px 8px;
  font-size: 0.66rem;
  font-weight: 700;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.difficulty-easy { background: rgba(34, 197, 94, 0.15); color: #16a34a; }
.difficulty-medium { background: rgba(234, 179, 8, 0.15); color: #ca8a04; }
.difficulty-hard { background: rgba(239, 68, 68, 0.15); color: #dc2626; }
.language-badge { background: var(--accent-soft); color: var(--accent); }

[data-theme="dark"] .difficulty-easy { color: #4ade80; }
[data-theme="dark"] .difficulty-medium { color: #facc15; }
[data-theme="dark"] .difficulty-hard { color: #f87171; }

.problem-description {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--ink-2);
}
.problem-description code {
  font-size: 0.78em;
  padding: 1px 5px;
  background: var(--code-bg);
  border-radius: 3px;
  box-shadow: var(--shadow-inset-sm);
}

/* ── Editor Pane ──────────────────────────────────────────────────────────────── */
.ide-editor-area {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.ide-editor-column {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.ide-editor-pane {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.editor-tab-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  background: var(--bg-inset);
  box-shadow: 0 1px 0 rgba(0,0,0,0.40);
  height: 32px;
  flex-shrink: 0;
}

.editor-tabs-left {
  display: flex;
  align-items: center;
  gap: 0;
  height: 100%;
}

.editor-file-tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 12px;
  height: 100%;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--bg-elevated);
  border: none;
  box-shadow: 1px 0 0 rgba(0,0,0,0.30);
  cursor: default;
}
.editor-file-tab.active {
  color: var(--ink);
  background: var(--surface-raised);
  box-shadow: 1px 0 0 rgba(0,0,0,0.30), inset 0 -2px 0 var(--accent);
}
.editor-file-tab svg { opacity: 0.5; }

.editor-tabs-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.editor-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: none;
  border: none;
  border-radius: 4px;
  color: var(--ink-muted);
  cursor: pointer;
  transition: background 100ms, color 100ms;
}
.editor-action-btn:hover {
  background: var(--bg-inset);
  color: var(--ink);
}

/* Editor container — no extra border/radius, flush with tab bar */
.editor-container {
  border-radius: 0;
  overflow: hidden;
  border: none;
  box-shadow: none;
}

.editor-container .CodeMirror {
  height: 240px;
  font-size: 0.82rem;
  border: none;
  border-radius: 0;
}

/* Override CodeMirror themes within IDE */
.practice-panel .cm-s-atlas-light.CodeMirror,
.practice-panel .cm-s-atlas-dark.CodeMirror {
  border: none;
  border-radius: 0;
  padding: 2px 0;
}

/* ── Action Bar ───────────────────────────────────────────────────────────────── */
.ide-action-bar {
  padding: 6px 10px;
  background: var(--bg-inset);
  box-shadow: 0 -1px 0 rgba(0,0,0,0.40), 0 1px 0 rgba(0,0,0,0.40);
  flex-shrink: 0;
}

.practice-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

.actions-spacer { flex: 1; }

/* Run button accent style */
.btn.ide-run-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: #16a34a;
  color: #fff;
  border: none;
  box-shadow: var(--shadow-raise-sm);
  font-weight: 600;
}
.btn.ide-run-btn:hover:not(:disabled) { background: #15803d; box-shadow: var(--shadow-raise); }
.btn.ide-run-btn:disabled { opacity: 0.4; }

.practice-actions .btn svg { flex-shrink: 0; }

/* ── Output Pane ──────────────────────────────────────────────────────────────── */
.ide-output-pane {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  max-height: 200px;
  overflow: hidden;
}

.output-tab-bar {
  display: flex;
  align-items: center;
  padding: 0 10px;
  height: 28px;
  background: var(--bg-inset);
  box-shadow: 0 1px 0 rgba(0,0,0,0.40);
  flex-shrink: 0;
}

.output-tab {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: inset 0 -2px 0 var(--accent);
  padding: 4px 8px;
  line-height: 1;
}

.output-content {
  padding: 10px 12px;
  overflow-y: auto;
  flex: 1;
  font-size: 0.82rem;
  line-height: 1.55;
}

.output-placeholder {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-style: italic;
  margin: 0;
  padding: 8px 0;
}

/* Feedback card in output pane */
.feedback-card {
  padding: 10px 14px;
  border-radius: var(--r-sm);
  background: var(--bg);
  border: none;
  box-shadow: var(--shadow-inset-sm);
  font-size: 0.82rem;
  line-height: 1.6;
}

.feedback-card strong { color: var(--ink); }
.feedback-card code {
  font-size: 0.78em;
  padding: 1px 5px;
  background: var(--code-bg);
  border-radius: 3px;
}

.feedback-loading { display: flex; align-items: center; gap: 10px; min-height: 40px; }
.feedback-error { border-color: rgba(239, 68, 68, 0.3); }

.solution-reveal pre {
  margin: 8px 0;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  background: var(--code-bg);
  box-shadow: var(--shadow-inset-sm);
  overflow-x: auto;
}

.solution-reveal pre code { padding: 0; border: none; background: none; font-size: 0.8rem; }

.solution-badge {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 6px;
}

/* ── IDE Status Bar ───────────────────────────────────────────────────────────── */
.ide-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  height: 24px;
  background: var(--accent);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.66rem;
  font-weight: 500;
  flex-shrink: 0;
  border-radius: 0 0 calc(var(--r-md) - 1px) calc(var(--r-md) - 1px);
}

[data-theme="dark"] .ide-status-bar {
  background: #1e40af;
}

.status-left,
.status-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.status-branch svg { opacity: 0.7; }

/* ── Hint Display ─────────────────────────────────────────────────────────────── */
.hint-card {
  padding: 8px 12px;
  border-radius: var(--r-sm);
  background: rgba(234, 179, 8, 0.06);
  border-left: 3px solid #eab308;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.5;
}

.hint-badge {
  display: inline-block;
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #ca8a04;
  margin-bottom: 3px;
}

.hint-loading { min-height: 36px; display: flex; align-items: center; }

/* ── Loading & Error States ───────────────────────────────────────────────────── */
.practice-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px;
  color: var(--ink-muted);
  font-size: 0.84rem;
}

.typing-dots {
  display: flex;
  gap: 4px;
}

.typing-dots span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: typingBounce 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typingBounce {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1.1); }
}

.practice-error {
  text-align: center;
  padding: 14px;
  color: var(--ink-muted);
}

/* ── Setup/Gate Cards ─────────────────────────────────────────────────────────── */
.setup-card {
  padding: 14px 18px;
  border-radius: var(--r-sm);
  background: var(--bg);
  border: none;
  box-shadow: var(--shadow-inset-sm);
  font-size: 0.84rem;
}

.setup-card h4 { margin: 0 0 8px; font-size: 1rem; color: var(--ink); }
.setup-card ol { padding-left: 20px; margin: 8px 0; }
.setup-card li { margin: 4px 0; }
.setup-card code { font-size: 0.78em; padding: 2px 6px; background: var(--code-bg); border-radius: 3px; border: 1px solid var(--code-border); }

/* Hosted login gate */
.hosted-gate { text-align: center; padding: 32px 24px 28px; }
.hosted-gate-icon { color: var(--accent); margin-bottom: 14px; }
.hosted-gate h3 { font-size: 1.15rem; margin: 0 0 8px; font-weight: 700; }
.hosted-gate-desc { font-size: 0.82rem; color: var(--ink-2); line-height: 1.55; max-width: 380px; margin: 0 auto 14px; }

.hosted-login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 290px;
  margin: 0 auto;
}
.hosted-field {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-align: left;
}
.hosted-field input {
  font: inherit;
  font-size: 0.82rem;
  padding: 8px 12px;
  border: none;
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  box-shadow: var(--shadow-inset-sm);
  transition: box-shadow 150ms;
}
.hosted-field input:focus {
  outline: none;
  box-shadow: var(--shadow-inset), var(--shadow-focus);
}
.hosted-login-btn { margin-top: 4px; }
.hosted-gate-footer {
  font-size: 0.78rem;
  color: var(--ink-muted);
  margin-top: 14px;
}
.hosted-gate-footer a { color: var(--accent); text-decoration: underline; }

/* Hosted status bar */
.hosted-status-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  background: var(--bg-inset);
  box-shadow: 0 1px 0 rgba(0,0,0,0.40);
  font-size: 0.72rem;
  color: var(--ink-muted);
}
.hosted-user {
  font-weight: 600;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 140px;
}
.quota-display {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
}
.quota-display.quota-low { color: var(--red, #e53e3e); font-weight: 600; }
.hosted-logout-btn { font-size: 0.68rem; padding: 2px 6px; }

/* Hosted auth error */
.hosted-auth-error {
  color: var(--red, #e53e3e);
  font-size: 0.78rem;
  text-align: center;
  padding: 6px 10px;
  background: rgba(229, 62, 62, 0.08);
  border-radius: 4px;
  margin-bottom: 4px;
}

/* Install gate */
.setup-gate { text-align: center; padding: 32px 24px 28px; }
.setup-gate-icon { color: var(--accent); margin-bottom: 14px; }
.setup-gate h3 { font-size: 1.15rem; margin: 0 0 10px; font-weight: 700; }
.setup-gate-desc { font-size: 0.82rem; color: var(--ink-2); line-height: 1.55; max-width: 400px; margin: 0 auto 8px; }
.setup-gate-size { font-size: 0.78rem; color: var(--ink-muted); }
.setup-alert {
  max-width: 480px;
  margin: 14px auto 0;
  padding: 10px 12px;
  border-radius: 4px;
  box-shadow: var(--shadow-inset-sm), inset 3px 0 0 0 rgba(245, 158, 11, 0.50);
  background: var(--bg);
  color: var(--ink-2);
  text-align: left;
  line-height: 1.5;
  font-size: 0.82rem;
}
.setup-alert code { white-space: nowrap; }
.setup-troubleshoot {
  max-width: 480px;
  margin: 10px auto 0;
  text-align: left;
}
.setup-troubleshoot-title {
  margin: 0 0 6px;
  font-size: 0.72rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.setup-command {
  margin: 0;
  padding: 10px 12px;
  border-radius: 4px;
  border: 1px solid var(--code-border);
  background: var(--code-bg);
  color: var(--ink);
  overflow-x: auto;
  font: 0.78rem/1.5 'JetBrains Mono', monospace;
  white-space: pre-wrap;
  word-break: break-word;
}
.setup-troubleshoot-note {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
}
.setup-steps {
  display: grid;
  gap: 8px;
  max-width: 460px;
  margin: 14px auto 0;
  text-align: left;
}
.setup-step {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 8px;
  align-items: start;
  padding: 8px 10px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--bg-elevated) 70%, transparent);
  border: 1px solid var(--border);
  color: var(--ink-2);
  font-size: 0.82rem;
}
.setup-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
}
.setup-gate-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 18px 0 16px;
}
.setup-download-btn,
.setup-check-btn { font-size: 0.92rem; padding: 12px 28px; }
.setup-gate-polling {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; font-size: 0.78rem; color: var(--ink-muted);
}
.setup-gate-polling .typing-dots { display: inline-flex; gap: 3px; }
.setup-gate-polling .typing-dots span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--ink-muted); animation: gatePulse 1.4s ease-in-out infinite;
}
.setup-gate-polling .typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.setup-gate-polling .typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes gatePulse { 0%, 80%, 100% { opacity: 0.3; } 40% { opacity: 1; } }

.setup-checkbox {
  flex-direction: row !important;
  align-items: center !important;
  gap: 6px !important;
}
.setup-checkbox input[type="checkbox"] { width: auto; }

.setup-intro { margin: 8px 0 16px; line-height: 1.55; }
.setup-intro a { color: var(--accent); text-decoration: underline; }
.setup-done-text { color: var(--accent); font-weight: 600; }
.setup-alt { font-size: 0.78rem; color: var(--ink-muted); }
.setup-ready { text-align: center; padding: 20px 16px; }
.setup-ready-icon { font-size: 2rem; color: var(--accent); margin-bottom: 8px; }
.setup-ready h4 { font-size: 1rem; }

.setup-pulling { text-align: center; padding: 32px 24px; }
.setup-pulling h3 { font-size: 1.1rem; margin: 0 0 4px; }
.setup-pull-sub { font-size: 0.78rem; color: var(--ink-muted); margin: 0 0 20px; }
.pull-progress-wrap { max-width: 360px; margin: 0 auto; }
.pull-progress-bar {
  width: 100%; height: 8px; border-radius: 4px;
  background: var(--bg); border: none; box-shadow: var(--shadow-inset-sm);
  overflow: hidden;
}
.pull-progress-fill {
  height: 100%; width: 0; border-radius: 4px;
  background: var(--accent); transition: width 0.3s ease;
}
.pull-status { font-size: 0.72rem; color: var(--ink-muted); margin-top: 8px; }
.pull-error { color: #dc2626; }
[data-theme="dark"] .pull-error { color: #f87171; }

.setup-advanced { margin-top: 10px; border-top: 1px solid var(--border); padding-top: 6px; }
.setup-advanced summary { font-size: 0.78rem; color: var(--ink-muted); cursor: pointer; }
.setup-advanced summary:hover { color: var(--ink); }

.setup-config {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  align-items: flex-end;
}

.setup-config label {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 0.72rem;
  color: var(--ink-muted);
}

.setup-config input {
  font: inherit;
  font-size: 0.78rem;
  padding: 5px 8px;
  border: none;
  border-radius: 4px;
  background: var(--bg);
  box-shadow: var(--shadow-inset-sm);
  color: var(--ink);
}

/* ── Examples Tab ─────────────────────────────────────────────────────────────── */
.examples-empty {
  color: var(--ink-muted);
  font-size: 0.82rem;
  font-style: italic;
  padding: 14px;
}

.example-card {
  padding: 12px 14px;
  border-radius: var(--r-sm);
  background: var(--bg);
  border: none;
  box-shadow: var(--shadow-raise-xs);
  margin-bottom: 10px;
}

.example-header {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  margin-bottom: 5px;
}

.example-source-badge {
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--accent-soft);
  color: var(--accent);
}

.example-tag {
  font-size: 0.64rem;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--ink-muted);
}

.example-card h4 { margin: 0 0 5px; font-size: 0.88rem; color: var(--ink); }
.example-card p { margin: 0 0 6px; font-size: 0.78rem; color: var(--ink-2); }

.example-card pre {
  margin: 6px 0;
  padding: 10px 12px;
  border-radius: 4px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  overflow-x: auto;
}

.example-card pre code { padding: 0; border: none; background: none; font-size: 0.78rem; }

.example-insight {
  font-size: 0.78rem;
  color: var(--accent);
  border-top: 1px solid var(--border);
  padding-top: 6px;
  margin-top: 6px;
}

.practice-intro { color: var(--ink-muted); font-size: 0.82rem; margin: 0; }

/* ── File Explorer ────────────────────────────────────────────────────────────── */
.ide-file-explorer {
  width: 180px;
  min-width: 140px;
  max-width: 240px;
  background: var(--bg-inset);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.ide-file-explorer.hidden { display: none; }

.explorer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.explorer-title {
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.explorer-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: none;
  border: none;
  border-radius: 3px;
  color: var(--ink-muted);
  cursor: pointer;
  transition: background 100ms, color 100ms;
}
.explorer-action-btn:hover { background: var(--bg-elevated); color: var(--ink); }

.explorer-tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.explorer-item {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px 3px 14px;
  font-size: 0.72rem;
  color: var(--ink-2);
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: background 80ms;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.explorer-item:hover { background: var(--bg-elevated); }
.explorer-item.active {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--ink);
  border-left-color: var(--accent);
  font-weight: 500;
}
.explorer-item.readonly { opacity: 0.5; font-style: italic; }
.explorer-item svg { flex-shrink: 0; opacity: 0.5; }

.explorer-item-actions {
  margin-left: auto;
  display: flex;
  gap: 2px;
  opacity: 0;
}
.explorer-item:hover .explorer-item-actions { opacity: 1; }

.explorer-item-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: none;
  border: none;
  border-radius: 2px;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.65rem;
}
.explorer-item-btn:hover { background: var(--bg-inset); color: var(--ink); }

.explorer-notice {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  font-size: 0.65rem;
  color: var(--ink-muted);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  line-height: 1.4;
}
.explorer-notice svg { flex-shrink: 0; opacity: 0.5; }

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
  padding: 0;
}
.btn-link:hover { opacity: 0.8; }

/* ── Multi-file Tabs ──────────────────────────────────────────────────────────── */
.editor-file-tab .tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-left: 4px;
  background: none;
  border: none;
  border-radius: 2px;
  color: var(--ink-faint);
  cursor: pointer;
  font-size: 0.8rem;
  line-height: 1;
  opacity: 0;
  transition: opacity 80ms, color 80ms;
}
.editor-file-tab:hover .tab-close { opacity: 1; }
.editor-file-tab .tab-close:hover { background: var(--bg-inset); color: var(--ink); }
.editor-file-tab.modified .tab-close { opacity: 1; }
.editor-file-tab.modified::after {
  content: "\25CF";
  font-size: 0.5rem;
  color: var(--accent);
  margin-left: 4px;
}

/* ── View Controls (explorer, mode, fullscreen) ───────────────────────────────── */
.ide-view-controls {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 8px;
}

.ide-view-controls .editor-action-btn.active {
  background: var(--bg-inset);
  color: var(--accent);
}

/* ── Run Button (green play) ──────────────────────────────────────────────────── */
.btn.btn-success {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: #16a34a;
  color: #fff;
  border-color: #16a34a;
  font-weight: 600;
}
.btn.btn-success:hover:not(:disabled) { background: #15803d; border-color: #15803d; }
.btn.btn-success:disabled { opacity: 0.4; }

/* ── Output Tabs (clickable) ──────────────────────────────────────────────────── */
.output-tab {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  padding: 4px 8px;
  line-height: 1;
  cursor: pointer;
  transition: color 100ms, border-color 100ms;
}
.output-tab:hover { color: var(--ink); }
.output-tab.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ── Console Display ──────────────────────────────────────────────────────────── */
.console-output {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
  margin: 0;
}

.console-line { margin: 0; }
.console-line.stdout { color: var(--ink); }
.console-line.stderr { color: #dc2626; }
[data-theme="dark"] .console-line.stderr { color: #f87171; }
.console-line.info { color: var(--ink-muted); font-style: italic; }

.console-running {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  color: var(--ink-muted);
  font-size: 0.78rem;
}

/* ── Fullscreen Mode ──────────────────────────────────────────────────────────── */
.practice-panel.ide-fullscreen {
  position: fixed !important;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  max-height: none !important;
  height: 100vh !important;
  width: 100vw !important;
  border-radius: 0;
  border: none;
  margin: 0;
}

.practice-panel.ide-fullscreen .ide-workspace {
  flex: 1;
  min-height: 0;
}

.practice-panel.ide-fullscreen .editor-container .CodeMirror {
  height: 100% !important;
  flex: 1;
}

.practice-panel.ide-fullscreen .ide-editor-column {
  flex: 1;
}

.practice-panel.ide-fullscreen .editor-container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.practice-panel.ide-fullscreen .ide-problem-pane {
  max-height: 40vh;
}

.practice-panel.ide-fullscreen .ide-output-pane {
  max-height: 30vh;
}

.practice-panel.ide-fullscreen .ide-status-bar {
  border-radius: 0;
}

/* Fullscreen button icon swap */
.practice-panel.ide-fullscreen #ide-fullscreen-btn svg {
  transform: rotate(180deg);
}

/* ── IDE Mode: Full (show explorer, bigger editor) ────────────────────────────── */
.practice-panel.ide-mode-full .ide-file-explorer {
  display: flex !important;
}

.practice-panel.ide-mode-full .editor-container .CodeMirror {
  height: 320px;
}

/* ── IDE Mode: Simplified (default — hide explorer, compact) ──────────────────── */
.practice-panel:not(.ide-mode-full) .ide-file-explorer {
  display: none !important;
}

.practice-panel:not(.ide-mode-full) .explorer-notice {
  display: none;
}

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .main-layout { grid-template-columns: minmax(0, 1fr) 340px; gap: 22px; }
  .reader-body { padding: 40px 40px; }
  .reader-column.practice-open .reader-split { grid-template-columns: 1fr; }
  .practice-panel { position: static; max-height: none; }

  .setup-step { grid-template-columns: 24px 1fr; padding: 8px 10px; }
  .setup-step-num { width: 24px; height: 24px; }
  .setup-download-btn, .setup-check-btn { width: 100%; padding: 10px 16px; }
}

@media (max-width: 1060px) {
  .bento-grid { grid-template-columns: repeat(3, 1fr); }
  .main-layout { grid-template-columns: 1fr; }
  .preview-column-shell { position: static; padding-bottom: 0; }
  .preview-column { max-height: none; overflow-y: visible; }
  .reader-body { padding: 36px 32px; }
  .reader-column.practice-open .reader-split { grid-template-columns: 1fr; }
  .practice-panel { position: static; max-height: none; }
}

@media (max-width: 740px) {
  .page-shell { padding: 0 12px 48px; }
  h1 { font-size: clamp(2rem, 8.5vw, 2.8rem); }
  .bento-grid { grid-template-columns: repeat(2, 1fr); max-width: 100%; }
  .filter-bar { max-width: 100%; }
  #query-input { max-width: 100%; }
  .search-kbd { display: none; }
  #query-input { padding-right: 16px; height: 52px; }
  .results-toolbar { flex-direction: column; align-items: flex-start; gap: 2px; }
  .reader-body { padding: 24px 20px; }
  .reader-body h1 { font-size: 1.6rem; }
  .top-nav { display: none; }
  .hero { padding: 36px 0 24px; }
  .hero::before { display: none; }
  .main-layout { padding-top: 24px; }

  .ide-toolbar { flex-direction: column; align-items: flex-start; gap: 6px; }
  .ide-control-bar { flex-wrap: wrap; gap: 10px; }
  .ide-problem-pane { max-height: 200px; }
  .editor-container .CodeMirror { height: 200px; }
  .ide-file-explorer { display: none !important; }
  .ide-view-controls { display: none; }
}


/* -- Developer links collapsible ------------------------------------------- */
.dev-links-details {
  margin: 14px 0;
}
.dev-links-details > summary {
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-muted);
  user-select: none;
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 5px;
}
.dev-links-details > summary::-webkit-details-marker { display: none; }
.dev-links-details > summary::before {
  content: "\25B6";
  font-size: 0.55rem;
  transition: transform 0.15s;
  display: inline-block;
}
.dev-links-details[open] > summary::before {
  transform: rotate(90deg);
}
.dev-links-details > summary:hover { color: var(--ink); }