/* ==============================================================================
   COMPONENTS & PATTERNS - zeshannasir.com
   ============================================================================== */

/* --- 1. SITE HEADER & NAVIGATION --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: var(--weight-bold);
  font-size: var(--text-body);
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.site-brand__mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.site-brand__name {
  display: flex;
  flex-direction: column;
}

.site-brand__title {
  font-size: 0.95rem;
  line-height: 1.2;
}

.site-brand__badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-teal);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-nav__link {
  font-size: 0.875rem;
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--text-primary);
  background-color: var(--bg-surface-raised);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background-color: var(--bg-surface-raised);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  padding: 0.5rem;
  color: var(--text-primary);
}

/* --- 2. HERO SECTION --- */
.hero-section {
  padding-top: clamp(3rem, 7vw, 6rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-teal);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-md);
}

.hero-title {
  font-size: var(--text-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  color: var(--text-primary);
  max-width: 22ch;
  margin-bottom: var(--space-lg);
}

.hero-title span.highlight {
  color: var(--accent-teal);
}

.hero-lead {
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-width: 48ch;
  margin-bottom: var(--space-xl);
}

.proof-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
}

.proof-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: var(--weight-medium);
  color: var(--text-primary);
}

.proof-item__label {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.proof-divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--border-strong);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.925rem;
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  cursor: pointer;
}

.btn--primary {
  background-color: var(--accent-teal);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background-color: var(--accent-teal-hover);
  transform: translateY(-1px);
}

.btn--secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn--secondary:hover {
  background-color: var(--bg-surface-raised);
  border-color: var(--accent-teal);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn--ghost {
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
}

.btn--ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-raised);
}

.btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* --- 3. SECTIONS COMMON --- */
.section {
  padding-top: clamp(4rem, 8vw, 6.5rem);
  padding-bottom: clamp(4rem, 8vw, 6.5rem);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: var(--space-3xl);
}

.section-eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-teal);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-xs);
}

.section-title {
  font-size: var(--text-h1);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.section-subtitle {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  max-width: 54ch;
}

/* --- 4. MANIFESTO / THESIS BENTO GRID --- */
.manifesto-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-lg);
}

.manifesto-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.manifesto-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.manifesto-card--large {
  grid-column: span 7;
}

.manifesto-card--medium {
  grid-column: span 5;
}

.manifesto-card--wide {
  grid-column: span 12;
}

.manifesto-card__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-teal);
  margin-bottom: var(--space-md);
  display: block;
}

.manifesto-card__title {
  font-size: var(--text-h3);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--leading-snug);
}

.manifesto-card__body {
  color: var(--text-secondary);
  font-size: var(--text-body);
  line-height: var(--leading-relaxed);
}

.manifesto-card__quote {
  margin-top: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 2px solid var(--accent-teal);
  font-style: italic;
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* --- 5. SELECTED SYSTEMS (FLAGSHIP WORK) --- */
.systems-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.system-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3.5vw, 2.5rem);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-normal);
}

.system-card:hover {
  border-color: var(--border-strong);
}

.system-card__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.system-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.system-card__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-teal);
  font-weight: var(--weight-semibold);
}

.system-card__domain {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
}

.system-card__title {
  font-size: var(--text-h2);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.system-card__tagline {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  max-width: 60ch;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.system-grid__content {
  grid-column: span 7;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.system-grid__sidebar {
  grid-column: span 5;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.system-block {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.system-block__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-teal);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: var(--weight-semibold);
}

.system-block__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: var(--leading-relaxed);
}

.metrics-box {
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}

.metrics-box__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.metrics-box__stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.metrics-box__val {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: var(--weight-bold);
  color: var(--text-primary);
}

.metrics-box__unit {
  font-size: 0.85rem;
  color: var(--accent-teal);
  font-weight: var(--weight-semibold);
}

.metrics-box__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.metrics-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
  border-left: 2px solid var(--border-strong);
  padding-left: var(--space-sm);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background-color: var(--bg-surface-raised);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.system-diagram-wrap {
  margin-top: var(--space-xl);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-canvas);
}

/* --- 6. RELIABILITY LAB & METRICS --- */
.lab-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
}

.telemetry-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.telemetry-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.telemetry-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.telemetry-card__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.telemetry-card__val {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.telemetry-card__desc {
  font-size: 0.825rem;
  color: var(--text-secondary);
}

/* Cluster Topology Frame */
.cluster-visual-container {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  margin-bottom: var(--space-3xl);
  box-shadow: var(--shadow-sm);
}

.cluster-visual-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.cluster-visual-title {
  font-size: 1rem;
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.cluster-visual-controls {
  display: flex;
  gap: var(--space-xs);
}

/* Services Matrix */
.services-table-wrap {
  overflow-x: auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.services-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.services-table caption {
  caption-side: top;
  text-align: left;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.services-table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-raised);
}

.services-table td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.services-table tbody th {
  font-family: inherit;
  font-size: inherit;
  text-transform: none;
  background-color: transparent;
  color: var(--text-primary);
  vertical-align: top;
}

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

.services-table tr:hover td {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
}

.service-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  color: var(--accent-teal);
}

/* --- 7. ARCHITECTURAL DECISIONS (ADR) --- */
.adr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: var(--space-lg);
}

.adr-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.adr-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.adr-card__badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-teal);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: var(--weight-semibold);
}

.adr-card__title {
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: var(--leading-snug);
}

.adr-card__section {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.adr-card__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.adr-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- 8. CAREER & AUTHORITY SIGNAL --- */
.career-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 4vw, 3rem);
}

.career-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-2xl);
}

.career-summary {
  grid-column: span 5;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.career-summary__lead {
  font-size: var(--text-body-lg);
  color: var(--text-primary);
  line-height: var(--leading-relaxed);
}

.career-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 480px) {
  .career-stats {
    grid-template-columns: 1fr;
  }
}

.career-stat {
  padding: var(--space-md);
  background-color: var(--bg-surface-raised);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.career-stat__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: var(--weight-bold);
  color: var(--accent-teal);
}

.career-stat__label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.career-timeline {
  grid-column: span 7;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  border-left: 1px solid var(--border-strong);
  padding-left: var(--space-xl);
}

.timeline-item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) - 5px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-teal);
  border: 2px solid var(--bg-surface);
}

.timeline-item__period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.timeline-item__role {
  font-size: 1.15rem;
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.timeline-item__company {
  color: var(--accent-teal);
  font-size: 0.95rem;
}

.timeline-item__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: var(--leading-normal);
  margin-top: 0.25rem;
}

/* --- 9. CONTACT & OPERATOR CLOSE --- */
.contact-section {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.contact-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

button.contact-channel {
  font: inherit;
  text-align: left;
  width: 100%;
  appearance: none;
}

.contact-channel {
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.contact-channel:hover {
  border-color: var(--accent-teal);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.contact-channel__icon {
  width: 24px;
  height: 24px;
  stroke: var(--accent-teal);
  stroke-width: 2;
  fill: none;
}

.contact-channel__title {
  font-size: 1.1rem;
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.contact-channel__detail {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.contact-channel__action {
  font-size: 0.8rem;
  color: var(--accent-teal);
  font-weight: var(--weight-medium);
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--accent-teal);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 9999;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- 10. FOOTER & COLOPHON --- */
.site-footer {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background-color: var(--bg-canvas);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-colophon {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-xl);
}

.colophon-block h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.colophon-block p {
  font-size: 0.825rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  transition: color var(--transition-fast);
}

.footer-back-to-top:hover {
  color: var(--accent-teal);
}

/* --- RESPONSIVE MEDIA QUERIES --- */
@media (max-width: 960px) {
  .manifesto-grid,
  .system-grid,
  .career-grid {
    grid-template-columns: 1fr;
  }

  .manifesto-card--large,
  .manifesto-card--medium {
    grid-column: span 1;
  }

  .system-grid__content,
  .system-grid__sidebar {
    grid-column: span 1;
  }

  .career-summary,
  .career-timeline {
    grid-column: span 1;
  }

  .career-timeline {
    border-left: none;
    padding-left: 0;
    margin-top: var(--space-lg);
  }

  .timeline-item::before {
    display: none;
  }
}

@media (max-width: 768px) {
  .site-nav {
    display: none;
  }

  .site-nav.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-strong);
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
  }

  .mobile-toggle {
    display: block;
  }
}

/* ==============================================================================
   404 PAGE — moved out of an inline <style> block so the Content-Security-Policy
   can drop 'unsafe-inline' from style-src.
   ============================================================================== */

.error-hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--container-pad);
}

.error-box {
  max-width: 540px;
  padding: var(--space-2xl);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: var(--weight-bold);
  color: var(--accent-teal);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.error-text {
  margin-top: var(--space-md);
  margin-bottom: var(--space-xl);
}