.main-shell {
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport height for mobile browsers */
  min-height: 100svh; /* Prefer small viewport to avoid bottom overscroll on mobile */
  display: flex;
  flex-direction: column;
  padding-top: 80px; /* Offset for fixed header */
}

@media (width <= 600px) {
  .main-shell {
    padding-top: 64px; /* Smaller header on mobile */
  }
}

main {
  flex: 1 0 auto;
}

.container {
  width: min(100%, var(--container-max));
  margin-inline: auto;
  padding-inline: clamp(var(--space-md), 3vw, var(--space-lg));
}

.section {
  padding-block: var(--space-xl);
}

.section[data-section-tone='surface'] {
  background: var(--bg-color);
}

.section[data-section-tone='sunken'] {
  background: var(--grey-light);
}

.section[data-section-tone='raised'] {
  background: var(--grey-light);
}

[data-theme="dark"] .section[data-section-tone='raised'] {
  background: #141414;
}

[data-theme="dark"] .section[data-section-tone='sunken'] {
  background: rgba(0, 0, 0, 0.3);
}

.pin-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background-color: var(--bg-color);
  width: 100%;
}

.pin-nav .container {
  width: 100%;
  max-width: 100%;
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-columns, 3), minmax(0, 1fr));
  gap: var(--grid-gap, var(--space-lg));
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap, var(--space-md));
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-gap, var(--space-sm));
  align-items: center;
}

.reading-width {
  max-width: 75ch;
}

.post-content {
  line-height: 1.7;
}

.post-content>*:first-child {
  margin-top: 0;
}

.post-content>*:last-child {
  margin-bottom: 0;
}

.post-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 1rem;
}

.post-hero__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.post-shell {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.post-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(var(--space-lg), 5vw, var(--space-xl));
}

.post-main {
  max-width: 75ch;
  width: 100%;
  margin: 0 auto;
}

.post-aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: sticky;
  top: calc(var(--space-xl) + 2rem);
  align-self: flex-start;
  max-width: 240px;
}

@media (width >=960px) {
  .post-grid {
    grid-template-columns: 1fr;
    justify-content: center;
    align-items: start;
  }

  .post-main {
    margin: 0 auto;
  }
}

.post-card {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  backdrop-filter: blur(6px);
  box-shadow: 0 10px 20px rgb(0 0 0 / 8%);
}

.post-card__label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.post-meta__value {
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.post-meta__value:last-child {
  margin-bottom: 0;
}

.post-card__list {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.post-card__row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.post-card__row dt {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.post-card__row dd {
  margin: 0;
  font-size: 1rem;
  color: var(--text-primary);
}

.post-share__actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.post-share__btn {
  border: 1px solid rgb(255 255 255 / 25%);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  background: rgb(255 255 255 / 5%);
  color: var(--text-primary);
  font-size: 0.95rem;
  text-align: center;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

.post-share__btn:hover,
.post-share__btn:focus-visible {
  background: rgb(255 255 255 / 15%);
  border-color: rgb(255 255 255 / 40%);
}

.post-share__btn:active {
  background: rgb(255 255 255 / 25%);
}

.post-share__help {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.post-share__status {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--white);
  min-height: 1em;
}

/* Desktop TOC Toggle Button */
.post-toc__desktop-btn {
  position: fixed;
  top: calc(var(--space-xl) + 1rem);
  right: var(--space-lg);
  z-index: var(--z-nav);
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(180deg, rgb(255 255 255 / 12%), rgb(255 255 255 / 8%));
  border: 1px solid rgb(255 255 255 / 20%);
  border-radius: 999px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgb(0 0 0 / 40%);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), border-color var(--transition-fast);
}

.post-toc__desktop-btn:hover,
.post-toc__desktop-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgb(0 0 0 / 50%);
  background: linear-gradient(180deg, rgb(255 255 255 / 18%), rgb(255 255 255 / 12%));
  border-color: rgb(255 255 255 / 30%);
  outline: none;
}

.post-toc__desktop-btn:active {
  transform: translateY(0);
}

.post-toc__desktop-btn-text {
  display: inline;
}

/* Show button on desktop when not hidden */
@media (width >=960px) {
  .post-toc__desktop-btn:not([hidden]) {
    display: flex !important;
  }
}

/* Hide button when hidden attribute is present */
.post-toc__desktop-btn[hidden] {
  display: none !important;
}

/* Desktop TOC Drawer */
.post-toc__desktop-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
  display: block;
}

.post-toc__desktop-drawer[hidden] {
  display: none;
}

@media (width <=959px) {
  .post-toc__desktop-drawer {
    display: none !important;
  }
}

.post-toc__desktop-drawer[data-toc-desktop-open] {
  pointer-events: auto;
}

.post-toc__desktop-drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / 40%);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--transition-med);
}

.post-toc__desktop-drawer[data-toc-desktop-open] .post-toc__desktop-drawer-overlay {
  opacity: 1;
}

.post-toc__desktop-drawer-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 30vw);
  max-width: 100%;
  background: linear-gradient(180deg, rgb(255 255 255 / 8%), rgb(255 255 255 / 4%));
  border-left: 1px solid rgb(255 255 255 / 12%);
  backdrop-filter: blur(16px);
  box-shadow: -8px 0 32px rgb(0 0 0 / 50%);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-med);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.post-toc__desktop-drawer[data-toc-desktop-open] .post-toc__desktop-drawer-content {
  transform: translateX(0);
}

.post-toc__desktop-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgb(255 255 255 / 10%);
}

.post-toc__desktop-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.post-toc__desktop-close:hover,
.post-toc__desktop-close:focus-visible {
  color: var(--white);
  background: rgb(255 255 255 / 8%);
  outline: none;
}

.post-toc__list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.post-toc__item a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.4;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  position: relative;
  padding-left: 0.75rem;
  transition: color var(--transition-fast);
}

.post-toc__item a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: rgb(255 255 255 / 35%);
  transition: background var(--transition-fast);
}

.post-toc__item a:hover,
.post-toc__item a:focus-visible {
  color: var(--white);
  text-decoration: underline;
  text-decoration-color: rgb(255 255 255 / 40%);
}

.post-toc__item a:hover::before,
.post-toc__item a:focus-visible::before {
  background: rgb(255 255 255 / 60%);
}

.post-toc__item a[aria-current='true'] {
  color: var(--white);
  font-weight: 500;
  text-decoration: none;
}

.post-toc__item a[aria-current='true']::before {
  background: var(--white);
  width: 5px;
  height: 5px;
}

.post-toc__item--level-3 {
  margin-left: 1rem;
  font-size: 0.9rem;
}

/* Mobile TOC Floating Button */
.post-toc__mobile-btn {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: calc(var(--z-nav) - 1);
  display: none;

  /* Hidden by default, shown on mobile */
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(180deg, rgb(255 255 255 / 12%), rgb(255 255 255 / 8%));
  border: 1px solid rgb(255 255 255 / 20%);
  border-radius: 999px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgb(0 0 0 / 40%);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), border-color var(--transition-fast);
}

.post-toc__mobile-btn:hover,
.post-toc__mobile-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgb(0 0 0 / 50%);
  background: linear-gradient(180deg, rgb(255 255 255 / 18%), rgb(255 255 255 / 12%));
  border-color: rgb(255 255 255 / 30%);
  outline: none;
}

.post-toc__mobile-btn:active {
  transform: translateY(0);
}

.post-toc__mobile-btn[hidden] {
  display: none !important;
}

.post-toc__mobile-btn-text {
  display: none;
}

@media (width <=959px) {
  .post-toc__mobile-btn:not([hidden]) {
    display: flex;
  }

  .post-toc__mobile-btn-text {
    display: inline;
  }
}

/* Mobile TOC Drawer */
.post-toc__mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
  display: block;
}

.post-toc__mobile-drawer[hidden] {
  display: none;
}

@media (width >=960px) {
  .post-toc__mobile-drawer {
    display: none !important;
  }
}

.post-toc__mobile-drawer[data-toc-mobile-open] {
  pointer-events: auto;
}

.post-toc__mobile-drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / 60%);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--transition-med);
}

.post-toc__mobile-drawer[data-toc-mobile-open] .post-toc__mobile-drawer-overlay {
  opacity: 1;
}

.post-toc__mobile-drawer-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 320px);
  max-width: 100%;
  background: linear-gradient(180deg, rgb(255 255 255 / 8%), rgb(255 255 255 / 4%));
  border-left: 1px solid rgb(255 255 255 / 12%);
  backdrop-filter: blur(16px);
  box-shadow: -8px 0 32px rgb(0 0 0 / 50%);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-med);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.post-toc__mobile-drawer[data-toc-mobile-open] .post-toc__mobile-drawer-content {
  transform: translateX(0);
}

.post-toc__mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgb(255 255 255 / 10%);
}

.post-toc__mobile-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.post-toc__mobile-close:hover,
.post-toc__mobile-close:focus-visible {
  color: var(--white);
  background: rgb(255 255 255 / 8%);
  outline: none;
}

.post-toc__list--mobile {
  flex: 1;
  margin-top: 0;
}

.post-toc__list--mobile .post-toc__item a {
  font-size: 0.95rem;
  padding: var(--space-xs) var(--space-sm);
  padding-left: calc(var(--space-sm) + 0.75rem);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.post-toc__list--mobile .post-toc__item a:hover,
.post-toc__list--mobile .post-toc__item a:focus-visible {
  background: rgb(255 255 255 / 8%);
  text-decoration: none;
}

.post-toc__list--desktop {
  flex: 1;
  margin-top: 0;
}

.post-toc__list--desktop .post-toc__item a {
  font-size: 0.95rem;
  padding: var(--space-xs) var(--space-sm);
  padding-left: calc(var(--space-sm) + 0.75rem);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.post-toc__list--desktop .post-toc__item a:hover,
.post-toc__list--desktop .post-toc__item a:focus-visible {
  background: rgb(255 255 255 / 8%);
  text-decoration: none;
}

.post-footer {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-lg);
}


@media (width <=959px) {
  .post-card {
    width: 100%;
  }

  .post-footer {
    flex-direction: column;
    gap: var(--space-md);
    align-items: flex-start;
  }

  .post-footer .cluster {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

@media (width <=600px) {
  .post-hero__meta {
    font-size: 0.9rem;
    gap: 0.75rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .post-hero__meta-item {
    font-size: 0.9rem;
  }

  .post-card {
    padding: var(--space-md);
  }

  .post-card__label {
    font-size: 0.7rem;
  }

  .post-toc__mobile-btn {
    bottom: var(--space-md);
    right: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.85rem;
  }

  .post-toc__mobile-drawer-content {
    width: min(90vw, 320px);
    padding: var(--space-md);
  }

  .post-share__help {
    font-size: 0.8rem;
  }

  .post-share__status {
    font-size: 0.8rem;
  }

  .post-footer {
    padding-top: var(--space-md);
  }
}

.hero {
  padding-block: var(--space-xl);
  padding-block-start: calc(var(--space-xl) + 1rem);
}

.hero__kicker {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.85rem;
  color: var(--grey-4);
}

.hero__title {
  margin-block: var(--space-sm);
}

.hero__lead {
  color: var(--text-secondary);
  font-size: 1.15rem;
}

.panel {
  background: var(--grey-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

/* Dark mode panel styling */
[data-theme="dark"] .panel {
  background: #1a1a1a;
  border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .panel h3,
[data-theme="dark"] .section[data-section-tone="raised"] h3 {
  color: #f0f0f0 !important;
}

[data-theme="dark"] [data-section-tone="raised"] {
  background: rgba(255, 255, 255, 0.03);
}

.panel--dense {
  padding: var(--space-md);
}

main {
  flex: 1;
}

footer {
  padding-block: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

@media (width <=1024px) {
  .grid {
    grid-template-columns: repeat(var(--grid-columns-tablet, 2), minmax(0, 1fr));
  }
}

@media (width <=600px) {
  .grid {
    grid-template-columns: repeat(var(--grid-columns-mobile, 1), minmax(0, 1fr));
    gap: var(--space-md);
  }

  .panel {
    padding: var(--space-md);
  }

  .section {
    padding-block: var(--space-lg);
  }

  .hero {
    padding-block: var(--space-lg);
    padding-block-start: calc(var(--space-lg) + 1rem);
  }

  .hero__lead {
    font-size: 1rem;
  }

  .hero__title {
    overflow-wrap: break-word;
    hyphens: auto;
    margin-block: var(--space-xs);
  }

  .hero__kicker {
    font-size: 0.75rem;
  }

  .container {
    padding-inline: var(--space-md);
  }

  .cluster {
    gap: var(--space-xs) !important;
    flex-direction: column !important;
    align-items: stretch !important;
    justify-content: flex-start !important;
  }

  .cluster>* {
    width: 100% !important;
    text-align: center;
  }

  footer {
    text-align: center;
  }

  .reading-width {
    max-width: 100%;
  }
}

/* Extra small screens (phones in portrait) */
@media (width <=400px) {
  .container {
    padding-inline: var(--space-sm);
  }

  .hero {
    padding-block: var(--space-md);
    padding-block-start: calc(var(--space-md) + 0.5rem);
  }

  .hero__title {
    font-size: clamp(1.25rem, 5vw, 1.75rem);
  }

  .section {
    padding-block: var(--space-md);
  }

  .panel {
    padding: var(--space-sm);
  }

  .c-btn {
    padding-inline: var(--space-sm);
    font-size: 0.85rem;
  }

  .cluster .c-btn {
    width: 100%;
  }

  .c-header__brand-text {
    font-size: 0.9rem;
  }

  .cluster {
    gap: var(--space-sm) !important;
  }
}