/* Hallmark · genre: atmospheric · macrostructure: Workbench · theme: Cyber Dark (design.md) · designed-as-app · nav: N5 · footer: Ft5 · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49, 50–57) */
/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */

:root {
  /* Semantic workbench status tokens extending public/assets/css/style.css */
  --gu-emerald: var(--color-accent);
  --gu-emerald-soft: rgba(16, 185, 129, 0.14);
  --gu-emerald-done-bg: rgba(16, 185, 129, 0.08);
  --gu-emerald-active-bg: rgba(16, 185, 129, 0.09);
  --gu-emerald-border: rgba(16, 185, 129, 0.42);
  --gu-emerald-text: #6ee7b7;

  --gu-cyan: var(--color-cyan);
  --gu-cyan-soft: rgba(6, 182, 212, 0.14);
  --gu-cyan-bloom: rgba(6, 182, 212, 0.06);
  --gu-cyan-hover: rgba(6, 182, 212, 0.24);
  --gu-cyan-active-bg: rgba(6, 182, 212, 0.09);
  --gu-cyan-border: rgba(6, 182, 212, 0.42);
  --gu-cyan-text: #67e8f9;

  --gu-amber: #f59e0b;
  --gu-amber-soft: rgba(245, 158, 11, 0.14);
  --gu-amber-active-bg: rgba(245, 158, 11, 0.09);
  --gu-amber-border: rgba(245, 158, 11, 0.42);
  --gu-amber-glow: rgba(245, 158, 11, 0.25);
  --gu-amber-text: #fcd34d;

  --gu-rose: var(--color-rose);
  --gu-rose-soft: rgba(244, 63, 94, 0.14);
  --gu-rose-active-bg: rgba(244, 63, 94, 0.09);
  --gu-rose-border: rgba(244, 63, 94, 0.45);
  --gu-rose-text: #fda4af;

  --gu-purple: var(--color-purple);
  --gu-purple-soft: rgba(139, 92, 246, 0.14);
  --gu-purple-border: rgba(139, 92, 246, 0.42);
  --gu-purple-text: #c4b5fd;

  --gu-panel-deep: rgba(6, 10, 20, 0.78);
  --gu-panel-inset: rgba(9, 15, 29, 0.72);
  --gu-status-well: rgba(2, 6, 14, 0.45);
  --gu-track-bg: rgba(148, 163, 184, 0.12);
  --gu-table-head-bg: rgba(148, 163, 184, 0.05);
  --gu-table-row-hover: rgba(148, 163, 184, 0.04);
  --gu-specular-top: rgba(255, 255, 255, 0.22);
  --gu-specular-clear: rgba(255, 255, 255, 0);
  --gu-code-ink: #7dd3fc;
  --gu-ink-dark: #04150e;

  --gu-banner-offset: 68px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-med: 240ms;

  /* Lock exact project font pair and ensure Thai inside mono falls back to Google Sans, never Courier New */
  --font-sans: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Google Sans', monospace;
}

html,
body {
  overflow-x: clip;
  font-family: var(--font-sans);
}

button,
input,
select,
textarea {
  font-family: var(--font-sans);
}

pre,
kbd,
samp,
.gu-mono {
  font-family: var(--font-mono);
}

.gu-tabular {
  font-variant-numeric: tabular-nums;
}

.gu-accent-word {
  color: var(--gu-emerald);
}

/* ---- Hero Workbench Overrides ---- */
.gu-hero {
  padding: 40px 20px 56px;
  background: radial-gradient(circle at 50% 15%, var(--gu-emerald-soft) 0%, var(--gu-cyan-bloom) 40%, transparent 72%);
  border-bottom: 1px solid var(--glass-border);
  position: relative;
}

.gu-hero-inner {
  max-width: 1240px;
  margin: 0 auto;
}

.gu-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}

.gu-hero-copy {
  min-width: 0;
}

.gu-badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.gu-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-subtle);
  color: var(--color-text-muted);
}

.gu-pill--emerald {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald-border);
  color: var(--gu-emerald-text);
}

.gu-pill--cyan {
  background: var(--gu-cyan-soft);
  border-color: var(--gu-cyan-border);
  color: var(--gu-cyan-text);
}

.gu-pill--amber {
  background: var(--gu-amber-soft);
  border-color: var(--gu-amber-border);
  color: var(--gu-amber-text);
}

.gu-pill--rose {
  background: var(--gu-rose-soft);
  border-color: var(--gu-rose-border);
  color: var(--gu-rose-text);
}

.gu-pill--purple {
  background: var(--gu-purple-soft);
  border-color: var(--gu-purple-border);
  color: var(--gu-purple-text);
}

.gu-hero-title {
  font-size: clamp(1.85rem, 3.6vw + 0.6rem, 3.1rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin: 0 0 14px;
  overflow-wrap: anywhere;
  min-width: 0;
}

.gu-hero-lead {
  color: var(--color-text-muted);
  font-size: clamp(0.95rem, 1.2vw + 0.5rem, 1.08rem);
  line-height: 1.7;
  margin: 0;
  max-width: 65ch;
}

main :not(pre) > code,
.gu-inline-code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--gu-panel-deep);
  border: 1px solid var(--glass-border);
  color: var(--gu-cyan-text);
}

/* Telemetry Summary Strip */
.gu-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.gu-telemetry-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  min-width: 0;
}

.gu-telemetry-label {
  font-size: 0.76rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.gu-telemetry-label i {
  color: var(--gu-emerald);
}

.gu-telemetry-val {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 1.4vw, 1.08rem);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.gu-telemetry-sub {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--gu-emerald-text);
  margin-top: 3px;
  font-variant-numeric: tabular-nums;
}

/* ---- Main Workbench Container ---- */
.gu-workbench {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px 16px 88px;
}

/* ---- 6-Tab Navigation Rail ---- */
.gu-tab-rail-wrap {
  position: sticky;
  top: var(--gu-banner-offset);
  z-index: 90;
  margin-bottom: 24px;
  padding: 6px;
  background: var(--glass-bg-heavy);
  backdrop-filter: var(--glass-blur-lg);
  -webkit-backdrop-filter: var(--glass-blur-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular), var(--shadow-cyber);
  border-radius: var(--radius-md);
}

.gu-tab-rail {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.gu-tab-rail::-webkit-scrollbar {
  display: none;
}

.gu-tab-btn {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 10px 15px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.gu-tab-btn i {
  font-size: 0.9rem;
  color: var(--gu-cyan);
  transition: color var(--dur-fast) var(--ease-out);
}

.gu-tab-btn:hover {
  color: var(--color-text);
  background: var(--glass-bg-subtle);
  border-color: var(--glass-border);
}

.gu-tab-btn.is-active {
  background: linear-gradient(180deg, var(--gu-specular-top) 0%, var(--gu-specular-clear) 60%), var(--gu-emerald);
  color: var(--gu-ink-dark);
  border-color: var(--glass-border-light);
  box-shadow: 0 4px 16px var(--color-accent-glow);
  font-weight: 700;
}

.gu-tab-btn.is-active i {
  color: var(--gu-ink-dark);
}

/* Shared Accessible Interactive States (instant focus ring, active press, disabled) */
.gu-tab-btn:focus-visible,
.gu-phase-card:focus-visible,
.gu-ctrl-btn:focus-visible,
.gu-step-pill:focus-visible,
.gu-mini-copy-btn:focus-visible,
.gu-seg-btn:focus-visible {
  outline: 2px solid var(--gu-emerald);
  outline-offset: 2px;
}

.gu-tab-btn:active,
.gu-phase-card:active,
.gu-ctrl-btn:active,
.gu-step-pill:active,
.gu-mini-copy-btn:active,
.gu-seg-btn:active {
  transform: translateY(1px);
}

.gu-tab-btn:disabled,
.gu-phase-card:disabled,
.gu-ctrl-btn:disabled,
.gu-step-pill:disabled,
.gu-mini-copy-btn:disabled,
.gu-seg-btn:disabled,
[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

.gu-panel {
  display: none;
}

.gu-panel.is-active {
  display: block;
  animation: guFadeIn var(--dur-med) var(--ease-out);
}

@keyframes guFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Glass Surfaces ---- */
.gu-surface {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular), var(--shadow-cyber);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 20px;
}

.gu-surface-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.gu-surface-title {
  font-size: clamp(1.1rem, 2vw, 1.38rem);
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  overflow-wrap: anywhere;
  min-width: 0;
}

.gu-surface-title i {
  color: var(--gu-emerald);
  flex-shrink: 0;
}

.gu-surface-sub {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin: 5px 0 0;
  line-height: 1.55;
}

/* ---- 4-Phase Lifecycle Strip ---- */
.gu-phase-grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 12px;
}

.gu-phase-card {
  appearance: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  background: var(--gu-panel-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 15px 16px;
  cursor: pointer;
  color: var(--color-text);
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.gu-phase-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-light);
  transform: translateY(-2px);
}

.gu-phase-card.is-current {
  background: var(--gu-cyan-soft);
  border-color: var(--gu-cyan);
  box-shadow: 0 0 22px var(--color-cyan-glow);
}

.gu-phase-card.is-done {
  background: var(--gu-emerald-done-bg);
  border-color: var(--gu-emerald-border);
}

.gu-phase-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.gu-phase-name {
  font-weight: 700;
  font-size: 0.94rem;
  margin-bottom: 4px;
  color: var(--color-text);
}

.gu-phase-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* ---- Simulator Control Bar ---- */
.gu-sim-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--gu-panel-inset);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 20px;
}

.gu-sim-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.gu-ctrl-btn {
  appearance: none;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 9px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border-light);
  background: var(--glass-bg-subtle);
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.gu-ctrl-btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--gu-cyan);
}

.gu-ctrl-btn--play {
  background: linear-gradient(180deg, var(--gu-specular-top) 0%, var(--gu-specular-clear) 60%), var(--gu-emerald);
  color: var(--gu-ink-dark);
  border-color: var(--glass-border-light);
  font-weight: 700;
}

.gu-ctrl-btn--play:hover {
  background: var(--gu-emerald);
  border-color: var(--gu-emerald);
  color: var(--gu-ink-dark);
}

.gu-ctrl-btn--play.is-playing {
  background: var(--gu-amber);
  border-color: var(--gu-amber);
  color: var(--gu-ink-dark);
}

.gu-ctrl-btn--next {
  background: var(--gu-cyan-soft);
  border-color: var(--gu-cyan-border);
  color: var(--gu-cyan-text);
}

.gu-ctrl-btn--next:hover {
  background: var(--gu-cyan-hover);
  color: var(--color-text);
}

.gu-step-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  max-width: 100%;
  padding-bottom: 2px;
}

.gu-step-pill {
  appearance: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  padding: 6px 11px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--gu-panel-deep);
  color: var(--color-text-muted);
  white-space: nowrap;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.gu-step-pill:hover {
  color: var(--color-text);
  border-color: var(--glass-border-light);
}

.gu-step-pill.is-done {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald-border);
  color: var(--gu-emerald-text);
}

.gu-step-pill.is-current {
  background: var(--gu-cyan);
  border-color: var(--gu-cyan);
  color: var(--gu-ink-dark);
  box-shadow: 0 0 14px var(--color-cyan-glow);
}

/* ---- Architecture Topology Board ---- */
.gu-step-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.gu-step-heading-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.gu-step-title {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 700;
  margin: 0;
  overflow-wrap: anywhere;
  min-width: 0;
}

.gu-step-sub {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gu-cyan-text);
  margin: 6px 0 0;
  overflow-wrap: anywhere;
}

.gu-arch-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.gu-arch-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--gu-panel-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  min-width: 0;
}

.gu-arch-col-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--gu-cyan-text);
}

.gu-arch-col-head--amber {
  color: var(--gu-amber-text);
}

.gu-arch-col-head--emerald {
  color: var(--gu-emerald-text);
}

.gu-node-card {
  background: var(--gu-panel-deep);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 13px;
  min-width: 0;
  transition: border-color var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              background-color var(--dur-med) var(--ease-out);
}

.gu-node-card--grow {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.gu-node-card--dashed {
  border-style: dashed;
}

/* Active node states */
@keyframes guPulseCyan {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-cyan-glow); }
  50% { box-shadow: 0 0 22px 2px var(--color-cyan-glow); }
}

@keyframes guPulseRose {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-rose-glow); }
  50% { box-shadow: 0 0 24px 2px var(--color-rose-glow); }
}

@keyframes guPulseEmerald {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-accent-glow); }
  50% { box-shadow: 0 0 22px 2px var(--color-accent-glow); }
}

@keyframes guPulseAmber {
  0%, 100% { box-shadow: 0 0 0 0 var(--gu-amber-glow); }
  50% { box-shadow: 0 0 22px 2px var(--gu-amber-glow); }
}

.gu-node-card.active-cyan {
  border-color: var(--gu-cyan);
  background: var(--gu-cyan-active-bg);
  animation: guPulseCyan 2.2s infinite ease-in-out;
}

.gu-node-card.active-rose {
  border-color: var(--gu-rose);
  background: var(--gu-rose-active-bg);
  animation: guPulseRose 1.9s infinite ease-in-out;
}

.gu-node-card.active-emerald {
  border-color: var(--gu-emerald);
  background: var(--gu-emerald-active-bg);
  animation: guPulseEmerald 2.2s infinite ease-in-out;
}

.gu-node-card.active-amber {
  border-color: var(--gu-amber);
  background: var(--gu-amber-active-bg);
  animation: guPulseAmber 2.2s infinite ease-in-out;
}

.gu-node-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.gu-node-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 7px;
}

.gu-node-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-dim);
  white-space: nowrap;
}

.gu-node-desc {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin: 6px 0 0;
  line-height: 1.5;
}

.gu-node-status {
  margin-top: 8px;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--gu-status-well);
  border: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--gu-cyan-text);
  overflow-wrap: anywhere;
}

.gu-node-status.is-alert {
  background: var(--gu-rose-soft);
  border-color: var(--gu-rose-border);
  color: var(--gu-rose-text);
  font-weight: 700;
}

.gu-node-status.is-ok {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald-border);
  color: var(--gu-emerald-text);
  font-weight: 700;
}

.gu-dma-list,
.gu-reg-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.gu-dma-item,
.gu-reg-item {
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--gu-status-well);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.gu-dma-item--danger {
  border-color: var(--gu-rose-border);
  color: var(--gu-rose-text);
}

.gu-reg-addr {
  font-size: 0.68rem;
  color: var(--color-text-dim);
}

.gu-reg-val {
  font-weight: 700;
  margin-top: 2px;
  color: var(--gu-amber-text);
}

.gu-reg-val.is-locked {
  color: var(--gu-rose-text);
}

.gu-reg-val.is-unlocked {
  color: var(--gu-emerald-text);
}

/* PCIe Bridge Column */
.gu-pcie-bridge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--gu-panel-inset);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-mono);
}

.gu-pcie-label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.gu-pcie-mode {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--gu-cyan-soft);
  border: 1px solid var(--gu-cyan-border);
  color: var(--gu-cyan-text);
  white-space: nowrap;
}

/* Step Explanation Box */
.gu-explain-callout {
  margin-top: 16px;
  background: var(--gu-panel-inset);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.gu-explain-head {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gu-emerald-text);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.gu-explain-body {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--color-text);
}

/* Bottom 3-Column Inspector Grid */
.gu-inspector-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.gu-inspector-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular);
  border-radius: var(--radius-md);
  padding: 18px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.gu-inspector-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gu-cyan-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.gu-callstack-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  overflow-x: auto;
}

.gu-callstack-line {
  padding: 6px 10px;
  border-radius: 7px;
  color: var(--color-text-muted);
  white-space: pre;
}

.gu-callstack-line.is-leaf {
  background: var(--gu-emerald-soft);
  border: 1px solid var(--gu-emerald-border);
  color: var(--gu-emerald-text);
  font-weight: 700;
}

.gu-code-viewer {
  position: relative;
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--gu-code-ink);
  overflow-x: auto;
  flex: 1;
}

.gu-mini-copy-btn {
  appearance: none;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  border-radius: 7px;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 9px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.gu-mini-copy-btn:hover {
  color: var(--color-text);
  border-color: var(--gu-emerald-border);
}

.gu-mini-copy-btn.is-copied {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald);
  color: var(--gu-emerald-text);
}

.gu-bit-box {
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.gu-bit-box + .gu-bit-box {
  margin-top: 10px;
}

.gu-bit-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--color-text-dim);
  font-variant-numeric: tabular-nums;
}

.gu-bit-desc {
  font-size: 0.82rem;
  color: var(--color-text);
  line-height: 1.55;
  margin-top: 7px;
}

/* ---- Tab 2: SEC2 DMEM / IMEM & ROP Visualizer ---- */
.gu-segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.gu-seg-btn {
  appearance: none;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--gu-panel-deep);
  color: var(--color-text-muted);
  white-space: nowrap;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.gu-seg-btn:hover {
  color: var(--color-text);
  border-color: var(--glass-border-light);
}

.gu-seg-btn.is-active {
  background: var(--gu-emerald);
  border-color: var(--gu-emerald);
  color: var(--gu-ink-dark);
  font-weight: 700;
}

.gu-seg-btn--danger.is-active {
  background: var(--gu-rose);
  border-color: var(--gu-rose);
  color: var(--color-text);
}

.gu-rop-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.gu-dmem-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  background: var(--gu-panel-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.gu-dmem-block {
  padding: 12px 10px;
  border-radius: 8px;
  border: 1.5px solid var(--color-border);
  background: var(--gu-panel-deep);
  transition: background-color var(--dur-med) var(--ease-out),
              border-color var(--dur-med) var(--ease-out);
}

.gu-dmem-block.state-cyan {
  background: var(--gu-cyan-soft);
  border-color: var(--gu-cyan);
}

.gu-dmem-block.state-emerald {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald);
}

.gu-dmem-block.state-rose {
  background: var(--gu-rose-soft);
  border-color: var(--gu-rose);
}

.gu-slot-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.gu-slot-item {
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gu-slot-item > span:first-child {
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.gu-gadget-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.gu-gadget-card {
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--gu-panel-deep);
  border: 1px solid var(--gu-purple-border);
  text-align: center;
}

.gu-gadget-addr {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--gu-purple-text);
}

.gu-gadget-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 5px;
}

/* ---- Tab 3: Tensor Core Benchmark Bars & Table ---- */
.gu-ai-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.gu-meter-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.gu-meter-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  margin-bottom: 7px;
  font-variant-numeric: tabular-nums;
}

.gu-meter-head strong {
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.gu-meter-track {
  width: 100%;
  height: 12px;
  border-radius: var(--radius-pill);
  background: var(--gu-track-bg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.gu-meter-fill {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--gu-amber);
  transform-origin: left center;
  transform: scaleX(var(--gu-meter-scale, 0.55));
  transition: transform 0.55s var(--ease-out), background-color 0.3s var(--ease-out);
}

.gu-meter-fill.is-unlocked {
  background: linear-gradient(90deg, var(--gu-emerald), var(--gu-cyan));
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.gu-nibble-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 14px 0;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.gu-nibble-card {
  background: var(--gu-panel-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.gu-impact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.gu-impact-card {
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.gu-impact-card--high {
  border-color: var(--gu-emerald-border);
}

.gu-impact-card--warn {
  border-color: var(--gu-amber-border);
}

.gu-list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--color-text-muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

/* ---- Tab 4: Linux vs Windows Flow & Matrix Table ---- */
.gu-os-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 14px 0;
}

.gu-os-stage {
  padding: 14px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--gu-panel-inset);
  text-align: center;
  font-family: var(--font-sans);
  font-variant-numeric: tabular-nums;
}

.gu-os-stage--emerald {
  background: var(--gu-emerald-soft);
  border-color: var(--gu-emerald);
  color: var(--gu-emerald-text);
}

.gu-os-stage--cyan {
  background: var(--gu-cyan-soft);
  border-color: var(--gu-cyan-border);
  color: var(--gu-cyan-text);
}

.gu-os-stage--amber {
  background: var(--gu-amber-soft);
  border-color: var(--gu-amber-border);
  color: var(--gu-amber-text);
}

.gu-os-stage--rose {
  background: var(--gu-rose-soft);
  border-color: var(--gu-rose);
  color: var(--gu-rose-text);
}

.gu-os-stage--purple {
  background: var(--gu-purple-soft);
  border-color: var(--gu-purple-border);
  color: var(--gu-purple-text);
}

.gu-two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.gu-four-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.gu-reason-card {
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.gu-reason-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.gu-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--gu-panel-deep);
}

.gu-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.gu-table th,
.gu-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.gu-table thead th {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  background: var(--gu-table-head-bg);
  color: var(--color-text);
  white-space: nowrap;
}

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

.gu-table tbody tr:hover {
  background: var(--gu-table-row-hover);
}

/* ---- Tab 6: Glossary Search & Explorer ---- */
.gu-search-box {
  position: relative;
  margin-bottom: 16px;
}

.gu-search-box i {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-dim);
  pointer-events: none;
}

.gu-search-input {
  width: 100%;
  min-height: 44px;
  padding: 10px 14px 10px 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  outline: 2px solid transparent;
  outline-offset: 1px;
  background: var(--gu-panel-deep);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.gu-search-input:hover {
  border-color: var(--glass-border-light);
}

.gu-search-input:focus-visible {
  outline: 2px solid var(--gu-emerald);
  border-color: var(--gu-emerald-border);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.gu-search-input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.gu-dict-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.gu-dict-item {
  background: var(--gu-panel-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.gu-dict-item.is-hidden {
  display: none;
}

/* ---- Mobile Sticky Simulator Control Bar ---- */
.gu-mobile-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 950;
  background: var(--glass-bg-heavy);
  backdrop-filter: var(--glass-blur-lg);
  -webkit-backdrop-filter: var(--glass-blur-lg);
  border-top: 1px solid var(--glass-border);
  padding: 10px 12px max(10px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.gu-mobile-bar.is-hidden {
  display: none;
}

@media (max-width: 767px) {
  .glass-back-to-top {
    bottom: 76px;
  }
}

/* ---- Content-Driven Responsive Upgrades (min-width) ---- */
@media (min-width: 40rem) {
  .gu-workbench {
    padding: 34px 20px 72px;
  }

  .gu-surface {
    padding: 28px;
  }

  .gu-phase-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gu-dmem-strip {
    grid-template-columns: minmax(0, 3fr) minmax(0, 4fr) minmax(0, 2fr) minmax(0, 3fr);
  }

  .gu-slot-grid,
  .gu-nibble-grid,
  .gu-four-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gu-gadget-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .gu-os-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 48rem) {
  .gu-mobile-bar {
    display: none !important;
  }

  .gu-two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gu-impact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .gu-hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.95fr);
  }

  .gu-phase-grid,
  .gu-four-col {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .gu-arch-board {
    grid-template-columns: minmax(0, 3fr) 56px minmax(0, 4fr) minmax(0, 3fr);
    align-items: stretch;
  }

  .gu-pcie-bridge {
    flex-direction: column;
    padding: 14px 4px;
  }

  .gu-pcie-label {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }

  .gu-pcie-mode {
    font-size: 0.62rem;
    padding: 3px 5px;
  }

  .gu-inspector-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr);
  }

  .gu-rop-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .gu-ai-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

/* ---- Reduced Motion Support ---- */
@media (prefers-reduced-motion: reduce) {
  .gu-panel.is-active,
  .gu-node-card.active-cyan,
  .gu-node-card.active-rose,
  .gu-node-card.active-emerald,
  .gu-node-card.active-amber {
    animation: none !important;
  }

  .gu-tab-btn,
  .gu-phase-card,
  .gu-ctrl-btn,
  .gu-step-pill,
  .gu-node-card,
  .gu-dmem-block,
  .gu-seg-btn,
  .gu-mini-copy-btn {
    transition: opacity 120ms linear !important;
    transform: none !important;
  }

  .gu-meter-fill {
    transition: none !important;
  }
}