.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--accent-gold);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.8rem);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.45rem, 2vw, 2rem);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
}

.hero-subtitle,
.card-intro,
.simulation-intro,
p,
li {
  color: var(--text-2);
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  padding: var(--space-5);
}

.card-header,
.simulation-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.card > pre,
.callout pre {
  margin: 0 0 var(--space-4);
  max-width: 100%;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.card > pre code,
.callout pre code {
  white-space: inherit;
  overflow-wrap: inherit;
  word-break: inherit;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  text-decoration: none;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(180deg, var(--accent-blue), #347dd1);
  color: white;
  border-color: transparent;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-1);
}

.hero-actions,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-2);
  font-size: 0.9rem;
}

.concept-card p,
.prose-card p {
  margin-bottom: 0;
}

.callout {
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  border: 1px solid var(--line);
}

.callout-warning {
  background: rgba(255, 209, 102, 0.08);
  border-color: rgba(255, 209, 102, 0.28);
}

.takeaway-list,
.feature-list {
  margin: 0;
  padding-left: 1.1rem;
}

.sidebar-brand {
  margin-bottom: var(--space-5);
}

.sidebar-brand h2 {
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.sidebar-brand p,
.nav-group-label,
.site-footer p {
  color: var(--text-3);
}

.nav-group {
  margin-bottom: var(--space-5);
}

.nav-group-label {
  display: block;
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.nav-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--text-2);
}

.nav-link:hover,
.nav-link.is-active {
  background: rgba(78, 161, 255, 0.12);
  color: var(--text-1);
  text-decoration: none;
}
/* 00 content */
.accent-blue-card {
  border-left: 4px solid var(--accent-blue);
}

.accent-red-card {
  border-left: 4px solid var(--accent-red);
}

.accent-gold-card {
  border-left: 4px solid var(--accent-gold);
}

.inline-code-panel {
  margin: var(--space-4) 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.inline-code-panel pre {
  margin: 0;
  padding: 14px 16px;
  font-family: var(--font-mono);
  color: var(--text-1);
  white-space: pre-wrap;
}

.mini-note {
  margin-top: var(--space-4);
  padding: 12px 14px;
  border: 1px dashed rgba(78, 161, 255, 0.5);
  border-radius: var(--radius-md);
  background: rgba(78, 161, 255, 0.08);
  color: var(--text-2);
}

.memory-stack {
  margin-top: var(--space-4);
  display: grid;
  gap: 10px;
}

.memory-stack-label {
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.memory-box {
  border: 1px solid rgba(255, 107, 107, 0.45);
  border-radius: 10px;
  padding: 10px 12px;
  background: rgba(255, 107, 107, 0.06);
  color: var(--text-2);
  font-family: var(--font-mono);
}

.memory-box-c {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-1);
  text-align: center;
}

.memory-box-value {
  border-color: rgba(61, 220, 151, 0.55);
  background: rgba(61, 220, 151, 0.08);
  color: var(--accent-green);
}

.supporting-note {
  margin-top: var(--space-4);
  color: var(--text-3);
  font-size: 0.95rem;
}

.concept-subcard {
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.025);
}

.binary-preview {
  margin-top: var(--space-4);
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.25);
}

.binary-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--accent-blue);
  border-radius: 8px;
  color: var(--accent-blue);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.binary-preview-text {
  color: var(--text-2);
  margin-bottom: 8px;
}

.binary-preview-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.table-intro {
  margin-top: 0;
  margin-bottom: var(--space-4);
  color: var(--text-2);
}

.table-wrap {
  overflow-x: auto;
}

.deep-dive-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

.deep-dive-table th,
.deep-dive-table td {
  text-align: left;
  padding: 14px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.deep-dive-table th {
  color: var(--text-3);
  font-size: 0.92rem;
  font-weight: 700;
}

.deep-dive-table td {
  color: var(--text-2);
}

.deep-dive-table tbody tr:last-child td {
  border-bottom: 0;
}

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

.container-comparison-card {
  display: grid;
  gap: 10px;
}

.container-compare-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.8fr 0.8fr 1fr 1fr 1.35fr;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.container-compare-grid-header {
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  background: rgba(78, 161, 255, 0.06);
}

.container-profile-card {
  border-left: 4px solid var(--line-strong);
}

.container-profile-list {
  border-left-color: var(--accent-blue);
}

.container-profile-tuple {
  border-left-color: var(--accent-purple);
}

.container-profile-dict {
  border-left-color: var(--accent-green);
}

.container-profile-set {
  border-left-color: var(--accent-gold);
}

.page-utility-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-7);
}

@media (max-width: 980px) {
  .card-grid-2,
  .container-compare-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-utility-nav {
    flex-direction: column;
  }
}

.cheat-sheet-panel[hidden] {
  display: none;
}

.cheat-sheet-panel {
  position: fixed;
  inset: 0;
  z-index: 1200;
}

.cheat-sheet-overlay {
  position: absolute;
  inset: 0;
  border: 0;
  padding: 0;
  background: rgba(4, 8, 16, 0.62);
  cursor: pointer;
}

.cheat-sheet-drawer {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: min(560px, 92vw);
  background: linear-gradient(180deg, rgba(14, 18, 28, 0.98), rgba(10, 14, 22, 0.98));
  border-left: 1px solid var(--line-strong);
  box-shadow: -16px 0 40px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.cheat-sheet-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  border-bottom: 1px solid var(--line);
  flex: 0 0 auto;
}

.cheat-sheet-toolbar h2 {
  margin-bottom: var(--space-2);
}

.cheat-sheet-intro {
  margin: 0;
  max-width: 48ch;
}

.cheat-sheet-tabs-wrap {
  padding: var(--space-4) var(--space-5) 0;
  flex: 0 0 auto;
}

.cheat-sheet-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.cheat-sheet-tab {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-2);
  border-radius: 999px;
  padding: 10px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.cheat-sheet-tab:hover,
.cheat-sheet-tab:focus-visible {
  border-color: var(--line-strong);
  color: var(--text-1);
  outline: none;
}

.cheat-sheet-tab.is-active {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-blue);
  color: var(--text-1);
  box-shadow: inset 0 0 0 1px rgba(110, 168, 254, 0.12);
}

.cheat-sheet-content {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-5);
  display: block;
}

.cheat-sheet-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
  display: block;
}

.cheat-sheet-group + .cheat-sheet-group {
  margin-top: var(--space-5);
}

.cheat-sheet-group-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.cheat-sheet-group-header h3 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.cheat-sheet-group-header p {
  margin: 0;
}

.cheat-sheet-method-list {
  display: block;
}

.cheat-sheet-method {
  display: block;
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cheat-sheet-method:first-child {
  border-top: 0;
}

.cheat-sheet-method-name {
  margin-bottom: 8px;
  color: var(--accent-gold);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
}

.cheat-sheet-method-description {
  margin: 0;
}

.cheat-sheet-method-example {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.28);
  overflow: hidden;
}

.cheat-sheet-method-example pre {
  margin: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  color: var(--text-1);
  white-space: pre-wrap;
}

.hero-actions {
  margin-top: var(--space-4);
}

@media (max-width: 680px) {
  .cheat-sheet-drawer {
    width: 100vw;
  }

  .cheat-sheet-toolbar,
  .cheat-sheet-tabs-wrap,
  .cheat-sheet-content,
  .cheat-sheet-group-header,
  .cheat-sheet-method {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}