/* ── Page Header ───────────────────────────────────────────────────────── */
.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 0.4rem;
}

.page-header p {
  font-size: 0.95rem;
  max-width: 600px;
}

/* ── Stat Card ─────────────────────────────────────────────────────────── */
.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}

.stat-icon.cyan { background: var(--accent-cyan-dim); color: var(--accent-cyan); }
.stat-icon.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.stat-icon.green { background: var(--status-green-dim); color: var(--status-green); }
.stat-icon.yellow { background: var(--status-yellow-dim); color: var(--status-yellow); }

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Nav Card (homepage links) ─────────────────────────────────────────── */
.nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all 0.2s;
}

.nav-card:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateY(-2px);
  color: inherit;
}

.nav-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.nav-card h3 { font-size: 1rem; color: var(--text-primary); }
.nav-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.5; }

/* ── Architecture Diagram ───────────────────────────────────────────────── */
.arch-diagram {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow-x: auto;
}

.arch-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: nowrap;
  min-width: 600px;
}

.arch-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  text-decoration: none;
  transition: all 0.2s;
  min-width: 90px;
}

.arch-node:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
}

.arch-node-icon { font-size: 1.4rem; margin-bottom: 4px; }
.arch-node-label { font-size: 0.72rem; font-weight: 600; color: var(--text-secondary); }

.arch-arrow {
  color: var(--text-muted);
  font-size: 1.4rem;
  padding: 0 0.25rem;
}

.arch-branch {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ── Bit Grid (decoder) ─────────────────────────────────────────────────── */
.bit-grid {
  display: grid;
  grid-template-columns: repeat(32, 1fr);
  gap: 2px;
  margin: 1rem 0;
  user-select: none;
}

.bit-cell {
  position: relative;
  aspect-ratio: 1;
  min-height: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  cursor: pointer;
  transition: transform 0.1s, filter 0.1s;
  font-size: 0.6rem;
}

.bit-cell:hover { transform: scaleY(1.15); filter: brightness(1.3); z-index: 1; }

.bit-cell .bit-index {
  position: absolute;
  top: 1px;
  font-size: 0.45rem;
  opacity: 0.6;
  color: rgba(255,255,255,0.8);
}

.bit-cell .bit-value {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: rgba(255,255,255,0.95);
}

.bit-cell.active { outline: 2px solid rgba(255,255,255,0.5); }

/* Field colors */
.field-opcd  { background: rgba(34, 211, 238, 0.5); }
.field-rt    { background: rgba(168, 85, 247, 0.5); }
.field-ra    { background: rgba(59, 130, 246, 0.5); }
.field-rb    { background: rgba(245, 158, 11, 0.5); }
.field-xo    { background: rgba(16, 185, 129, 0.5); }
.field-rc    { background: rgba(239, 68, 68, 0.5); }
.field-oe    { background: rgba(236, 72, 153, 0.5); }
.field-si    { background: rgba(132, 204, 22, 0.5); }
.field-li    { background: rgba(20, 184, 166, 0.5); }
.field-bd    { background: rgba(251, 191, 36, 0.5); }
.field-aa    { background: rgba(249, 115, 22, 0.5); }
.field-lk    { background: rgba(217, 70, 239, 0.5); }
.field-bo    { background: rgba(14, 165, 233, 0.5); }
.field-bi    { background: rgba(139, 92, 246, 0.5); }
.field-unknown { background: rgba(107, 114, 128, 0.3); }

.field-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.field-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.field-legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* ── Decoder Field Table ─────────────────────────────────────────────────── */
.field-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.field-table th {
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.field-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.field-table tr:last-child td { border-bottom: none; }

.field-table .field-name {
  display: flex;
  align-items: center;
  gap: 8px;
}

.field-table .field-swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── ISA Filter Bar ─────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  padding: 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.filter-bar .search-wrap {
  position: relative;
  flex: 1;
  min-width: 180px;
}

.filter-bar .search-wrap svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 14px;
  height: 14px;
}

.filter-bar .search-wrap input {
  padding-left: 2rem;
}

.filter-bar select { flex: 0 0 auto; width: auto; min-width: 130px; }

.filter-stats {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ── ISA Row Detail ─────────────────────────────────────────────────────── */
.isa-detail {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  font-size: 0.82rem;
}

.isa-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.isa-detail-item label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.isa-detail-item span {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* ── Register Block ─────────────────────────────────────────────────────── */
.reg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

.reg-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.6rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}

.reg-item:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-elevated);
}

.reg-item.selected {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

.reg-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 24px;
}

.reg-name {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.reg-alias {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  margin-left: auto;
}

/* ── CR Diagram ─────────────────────────────────────────────────────────── */
.cr-diagram {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0.5rem;
  margin: 1rem 0;
}

.cr-field {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
}

.cr-field:hover, .cr-field.active {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

.cr-field-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.cr-bits {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.cr-bit {
  font-size: 0.6rem;
  padding: 1px;
  background: var(--bg-elevated);
  border-radius: 2px;
  color: var(--text-muted);
}

/* ── XER Diagram ─────────────────────────────────────────────────────────── */
.xer-bits {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin: 0.75rem 0;
}

.xer-bit-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.xer-bit-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-align: center;
}

.xer-bit-box {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  min-width: 28px;
  text-align: center;
}

.xer-bit-box.named {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

/* ── Contributing sidebar ───────────────────────────────────────────────── */
.doc-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

.doc-sidebar {
  position: sticky;
  top: 1rem;
}

.doc-nav-item {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  border: none;
  background: none;
  text-align: left;
  width: 100%;
}

.doc-nav-item:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.doc-nav-item.active {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
}

/* ── Markdown styles ─────────────────────────────────────────────────────── */
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: var(--text-primary);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.markdown-body h1 { font-size: 1.6rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; }
.markdown-body h2 { font-size: 1.25rem; }
.markdown-body h3 { font-size: 1.05rem; }

.markdown-body p {
  color: var(--text-secondary);
  margin-bottom: 0.75em;
  line-height: 1.7;
}

.markdown-body ul, .markdown-body ol {
  color: var(--text-secondary);
  padding-left: 1.5rem;
  margin-bottom: 0.75em;
}

.markdown-body li { margin-bottom: 0.25em; line-height: 1.6; }

.markdown-body a { color: var(--accent-cyan); }
.markdown-body a:hover { text-decoration: underline; }

.markdown-body blockquote {
  border-left: 3px solid var(--accent-cyan);
  padding-left: 1rem;
  color: var(--text-secondary);
  font-style: italic;
  margin: 1rem 0;
}

.markdown-body table { border-collapse: collapse; width: 100%; margin: 1rem 0; }
.markdown-body th { background: var(--bg-elevated); color: var(--text-secondary); padding: 0.5rem 0.75rem; text-align: left; font-size: 0.85rem; border: 1px solid var(--border); }
.markdown-body td { padding: 0.5rem 0.75rem; border: 1px solid var(--border); color: var(--text-secondary); font-size: 0.85rem; }

.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }

/* ── Alert/Note boxes ────────────────────────────────────────────────────── */
.note {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  border-left: 3px solid;
}

.note-info {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--text-secondary);
}

.note-warning {
  background: var(--status-yellow-dim);
  border-color: var(--status-yellow);
  color: var(--text-secondary);
}

/* ── Loading spinner ─────────────────────────────────────────────────────── */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Tabs ────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.tab-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
  margin-bottom: -1px;
}

.tab-btn:hover { color: var(--text-primary); }

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Hex input ────────────────────────────────────────────────────────────── */
.hex-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hex-prefix {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-muted);
  padding: 0.5rem 0;
}

.hex-input {
  font-family: var(--font-mono) !important;
  font-size: 1.4rem !important;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  text-align: center;
  max-width: 230px;
  padding: 0.6rem 1rem !important;
}

.preset-btn {
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.preset-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ── Instruction result panel ─────────────────────────────────────────────── */
.instr-result {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-top: 1rem;
}

.instr-mnemonic {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.instr-assembly {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.instr-op {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
}

/* ── Category progress summary ──────────────────────────────────────────── */
.category-progress {
  margin-bottom: 0.5rem;
}

.category-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.category-progress-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: capitalize;
}

.category-progress-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── ISA Row Parent/Child hierarchy ────────────────────────────────────── */
.isa-row-parent {
  border-left: 3px solid transparent;
  transition: background 0.15s, border-color 0.15s;
}

.isa-row-parent.isa-status-implemented { border-left-color: var(--status-green); }
.isa-row-parent.isa-status-stub { border-left-color: var(--status-yellow); }
.isa-row-parent.isa-status-not_started { border-left-color: transparent; }

.isa-row-child {
  background: rgba(10, 14, 26, 0.4);
  border-left: 3px solid var(--border);
  opacity: 0.85;
}

.isa-row-child:hover { opacity: 1; background: var(--bg-hover); }

.isa-row.expanded {
  background: var(--bg-elevated);
}

.isa-name-cell {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.85rem;
}

.child-indicator {
  color: var(--text-muted);
  font-size: 0.75rem;
  flex-shrink: 0;
  padding-left: 0.5rem;
}

.variant-count-chip {
  font-size: 0.62rem;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.1rem 0.45rem;
  flex-shrink: 0;
}

.isa-row-parent:hover .variant-count-chip {
  border-color: var(--border-light);
  color: var(--text-secondary);
}

.badge-format {
  font-size: 0.65rem;
  padding: 0.1rem 0.4rem;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 0.35rem;
  flex-shrink: 0;
}

.status-dot-implemented { background: var(--status-green); }
.status-dot-stub { background: var(--status-yellow); }
.status-dot-not_started { background: var(--status-grey); }

/* ── ISA Filter bar responsive ──────────────────────────────────────────── */
.filter-bar-inner {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  width: 100%;
}

.variants-toggle-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  white-space: nowrap;
}

.variants-toggle-wrap label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Toggle switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 18px;
  flex-shrink: 0;
}

.toggle-switch input { display: none; }

.toggle-knob {
  position: absolute;
  inset: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 99px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-knob::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: left 0.2s, background 0.2s;
}

.toggle-switch input:checked + .toggle-knob {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
}

.toggle-switch input:checked + .toggle-knob::after {
  left: 18px;
  background: var(--accent-cyan);
}

/* ── ISA Stats mode toggle ──────────────────────────────────────────────── */
.stats-count-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.2rem 0;
  transition: color 0.15s;
}

.stats-count-toggle:hover { color: var(--accent-cyan); }

/* ── Variant tags ────────────────────────────────────────────────────────── */
.variant-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: all 0.15s;
}

.variant-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.variant-tag.variant-parent {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border-color: rgba(34,211,238,0.3);
}

.variant-tag.variant-implemented {
  border-color: rgba(16,185,129,0.4);
  color: var(--status-green);
}

.variant-tag.variant-not_started {
  opacity: 0.6;
}

/* ── Category progress (clickable) ─────────────────────────────────────── */
.category-progress {
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  transition: background 0.15s;
}

.category-progress:hover {
  background: var(--bg-hover);
}

.progress-fill-complete { background: linear-gradient(90deg, var(--status-green), #34d399); }

/* ── Decoder mode tabs ───────────────────────────────────────────────────── */
.decoder-mode-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 1.25rem;
}

.decoder-mode-btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}

.decoder-mode-btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.decoder-mode-btn.active {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border-color: rgba(34,211,238,0.4);
}

/* ── Input hint / prefix ─────────────────────────────────────────────────── */
.instr-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.input-prefix {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-muted);
  padding: 0.5rem 0;
  min-width: 2.5rem;
  text-align: right;
}

.instr-input {
  font-family: var(--font-mono) !important;
  font-size: 1.3rem !important;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-align: center;
  max-width: 280px;
  padding: 0.6rem 1rem !important;
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Binary display ─────────────────────────────────────────────────────── */
.binary-display {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin: 0.5rem 0 0;
  display: none;
}

/* ── History section ─────────────────────────────────────────────────────── */
.history-section {
  display: none;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.history-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.history-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.history-pill {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.72rem;
  transition: all 0.15s;
}

.history-pill:hover { border-color: var(--accent-cyan); }

.history-pill-name {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.history-pill-hex {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.65rem;
}

/* ── Instruction result enhancements ─────────────────────────────────────── */
.instr-result-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.instr-repr {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.instr-repr-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.instr-repr-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.35rem;
}

.instr-repr-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-primary);
}

.instr-family {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.btn-sm {
  padding: 0.3rem 0.65rem !important;
  font-size: 0.78rem !important;
}

.decoder-link {
  font-size: 0.78rem !important;
  padding: 0.3rem 0.7rem !important;
}

/* ── Builder UI ──────────────────────────────────────────────────────────── */
.builder-search-wrap {
  position: relative;
}

.builder-search-input {
  width: 100%;
  font-family: var(--font-mono) !important;
  font-size: 0.9rem !important;
}

.builder-results {
  display: none;
  position: fixed; /* fixed instead of absolute to escape stacking context from backdrop-filter */
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  max-height: 280px;
  overflow-y: auto;
  z-index: 9999;
  box-shadow: var(--shadow-lg);
}

.builder-result-item {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

.builder-result-item:last-child { border-bottom: none; }
.builder-result-item:hover { background: var(--bg-hover); }

.builder-result-child { padding-left: 1.5rem; opacity: 0.75; }

.builder-result-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-primary);
  min-width: 70px;
}

.builder-result-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.builder-selected-info {
  display: none;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.75rem;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
}

.builder-selected-name {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.builder-selected-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.builder-flags-info {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.builder-fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.builder-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.builder-field-flag {
  flex-direction: row;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.builder-field-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.builder-field-hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.builder-field-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.4rem 0.6rem;
  width: 100%;
  transition: border-color 0.15s;
}

.builder-field-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px var(--accent-cyan-dim);
}

.builder-field-name {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.builder-output {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.builder-hex-out {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
}

.builder-bin-out {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.builder-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

/* ── Responsive for doc layout ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-sidebar {
    position: static;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .doc-nav-item {
    flex: 0 0 auto;
    width: auto;
  }

  .cr-diagram {
    grid-template-columns: repeat(4, 1fr);
  }

  .bit-grid {
    overflow-x: auto;
    padding-bottom: 4px;
  }

  /* ISA table — hide less important columns on mobile */
  .col-format, .col-opcd {
    display: none;
  }

  .col-desc {
    max-width: 180px;
    font-size: 0.78rem;
    white-space: normal;
    line-height: 1.3;
  }

  /* Filter bar — stack on mobile */
  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-bar .search-wrap { min-width: 0; }
  .filter-bar select { width: 100%; }

  .variants-toggle-wrap { margin-left: 0; }

  /* Decoder panels — stack on mobile */
  #decode-panels { grid-template-columns: 1fr !important; }

  .instr-input { max-width: 100%; font-size: 1.1rem !important; }

  .bit-cell { min-height: 26px; }
  .bit-cell .bit-value { font-size: 0.6rem; }
  .bit-cell .bit-index { font-size: 0.38rem; }

  /* Builder fields full width */
  .builder-fields-grid { grid-template-columns: 1fr; }

  .decoder-mode-tabs { flex: 1; }
  .decoder-mode-btn { flex: 1; text-align: center; }

  /* ISA detail grid - stack */
  .isa-detail-grid { grid-template-columns: 1fr !important; }
  .isa-detail-item { grid-column: 1 !important; }
}