html,
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-bg-base);
  color: var(--color-text-base);
  font-family: var(--font-family-base);
  font-size: var(--font-size-md);
  line-height: var(--line-height-base);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

.app-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  padding: 0 var(--spacing-xl);
  height: 52px;
  background: var(--color-bg-base);
  border-bottom: 1px solid var(--color-border-base);
  position: sticky;
  top: 0;
  z-index: 100;
}

@media (max-width: 640px) {
  .app-nav {
    padding: 0 var(--spacing-md);
    gap: var(--spacing-sm);
  }
  .brand {
    font-size: 13px;
  }
  .radix-nav-list {
    gap: 4px;
  }
  .nav-link {
    padding: 4px 8px;
    font-size: 12px;
  }
  .nav-credits-link {
    margin-left: auto;
  }
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text-base);
  font-family: var(--font-family-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-base);
  font-size: 12px;
  line-height: 1;
}

.nav-links,
.prefs,
.user-area {
  display: flex;
  align-items: center;
}

.prefs,
.user-area {
  gap: var(--spacing-xs);
}

.prefs {
  flex-wrap: nowrap;
}

/* ── Nav divider ── */
.nav-divider {
  width: 1px;
  height: 16px;
  background: var(--color-border-base);
  margin: 0 var(--spacing-xs);
  flex-shrink: 0;
}

/* ── Nav links (center area) ── */
.nav-page-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  height: 32px;
  padding: 0 var(--spacing-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  font-family: var(--font-family-ui);
  text-decoration: none;
  cursor: pointer;
  border: 0;
  background: none;
  transition: color 0.12s, background 0.12s;
}

.nav-link:hover {
  color: var(--color-text-base);
  background: var(--color-ghost-base);
}

.nav-link.nav-link--active {
  color: var(--color-text-base);
  background: var(--color-ghost-base);
}

.nav-link--cta {
  background: var(--color-primary-base);
  color: var(--color-primary-text) !important;
}

.nav-link--cta:hover {
  background: var(--color-primary-hover) !important;
}

/* ── Credits badge ── */
.credit-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 30px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-base);
  color: var(--color-text-base);
  font-family: var(--font-family-ui);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
  white-space: nowrap;
}

.credit-badge:hover {
  border-color: var(--color-primary-base);
  background: var(--color-primary-glow);
  color: var(--color-text-base);
}

.credit-badge-gem {
  font-size: 14px;
  line-height: 1;
}

.credit-badge-count {
  font-variant-numeric: tabular-nums;
  color: var(--color-text-base);
}

.pref-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 var(--spacing-md);
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: var(--font-family-ui);
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  transition: color 0.12s, background 0.12s;
}

.pref-btn:hover {
  color: var(--color-text-base);
  background: var(--color-ghost-base);
}

.page-center {
  width: min(100%, var(--layout-page-max));
  margin-inline: auto;
}

/* Desktop: the asset shelf and inspector share one concise two-column workspace. */
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--layout-inspector-width);
  gap: var(--spacing-xl);
  align-items: start;
  padding: 0 var(--spacing-xl) var(--spacing-3xl);
}

.hero {
  margin-bottom: var(--spacing-xl);
}

.hero h1 {
  margin: 0 0 var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.04em;
}

.lede {
  margin: 0 0 var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.inspector {
  position: sticky;
  top: var(--spacing-lg);
  height: fit-content;
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border-base);
  border-radius: var(--radius-xl);
  background: var(--color-bg-panel);
}

.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  /* dashed border only shown when ad is explicitly in placeholder/draft state */
  background: var(--color-ghost-base);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.storage-usage-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  margin: var(--spacing-2xl) auto 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 600;
  line-height: var(--line-height-base);
  text-align: center;
}

.bottom-ad-area {
  /* Ads stay fully hidden until a real approved creative is available.
     Keep this at the shared CSS layer so HTML rebuilds cannot expose a blank white slot. */
  display: none !important;
  width: min(1120px, calc(100% - (2 * var(--spacing-xl))));
  margin: var(--spacing-2xl) auto 0;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border-base);
  background: var(--color-bg-base);
  overflow: hidden;
}

/* collapse entire ad area when the ad banner shrinks to zero */
.bottom-ad-area:has(.ad-banner:empty) {
  padding-top: 0;
  border-top: none;
}
.bottom-ad-area:has(.ad-banner:empty) .bottom-ad-label {
  display: none;
}

.bottom-ad-label {
  margin: 0 0 var(--spacing-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
}

.ad-banner {
  height: 90px;
  max-height: 90px;
  margin: 0;
  border-radius: var(--radius-lg);
  background: var(--color-bg-base);
  overflow: hidden;
  min-height: 0;
}

.ad-banner:empty,
.ad-banner:has(> ins:empty:not([data-ad-status])) {
  height: 0;
  border-radius: 0;
}

.ad-banner .adsbygoogle {
  width: 100%;
  min-height: 0 !important;
  max-height: 90px !important;
  background: var(--color-bg-base) !important;
  overflow: hidden;
}

/* AdSense 주입 iframe·div 흰 배경 강제 클리핑 */
.ad-banner iframe,
.ad-banner > ins > div,
.ad-banner > ins > iframe {
  background: transparent !important;
  color-scheme: dark;
}

.site-footer {
  padding: var(--spacing-3xl) var(--spacing-xl);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-align: center;
}

.site-footer-copy {
  margin-bottom: var(--spacing-md);
}

.site-footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.site-footer-links a:hover {
  color: var(--color-text-base);
}

.app-nav a:focus-visible,
.app-nav button:focus-visible {
  border-radius: var(--radius-sm);
  outline: 2px solid var(--color-primary-base);
  outline-offset: 2px;
}

/* Mirrors --breakpoint-tablet. CSS custom properties are not valid media conditions. */
@media (max-width: 860px) {
  .workspace {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-lg) var(--spacing-2xl);
  }

  .result {
    grid-template-columns: 1fr;
  }

  .stage {
    min-width: 0;
    overflow: visible;
  }

  .stage-head {
    flex-wrap: wrap;
  }

  .frame-example-pair {
    justify-content: flex-start;
  }

  .frame-example {
    width: 128px;
    height: 128px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .inspector {
    position: static;
    margin-top: var(--spacing-lg);
  }
}

/* Mirrors --breakpoint-mobile. The full interface becomes one vertical flow. */
@media (max-width: 640px) {
  .app-nav {
    height: auto;
    min-height: 52px;
    padding: 0 var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    align-items: stretch;
    justify-content: space-between;
  }

  .brand {
    font-size: 13px;
    width: 100%;
    justify-content: center;
    flex-shrink: 0;
  }

  .brand-icon {
    width: 20px;
    height: 20px;
    font-size: 11px;
  }

  .nav-links {
    width: 100%;
    justify-content: center;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .radix-nav-root,
  .radix-nav-list {
    width: 100%;
    justify-content: center;
  }

  .radix-nav-list > li:has(.nav-credits-link) {
    margin-left: 0;
  }

  .nav-links .prefs {
    justify-content: center;
    flex-wrap: wrap;
  }

  .nav-page-links {
    order: 0;
    width: auto;
    justify-content: flex-end;
    gap: 2px;
  }

  .prefs {
    margin-left: 0;
  }

  .pref-btn {
    min-height: 44px;
    padding-inline: var(--spacing-sm);
  }

  .workspace {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-md) var(--spacing-xl);
  }

  .hero {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
  }

  .hero h1 {
    font-size: var(--font-size-xl);
  }

  .product-guide {
    padding-inline: var(--spacing-lg);
  }

  .product-guide h2 {
    font-size: var(--font-size-xl);
  }

  .type-grid {
    grid-template-columns: 1fr;
  }

  .rail-head,
  .stage-copy {
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-xs);
  }

  .frame-example {
    width: 96px;
    height: 96px;
  }

  .dropzone {
    margin: var(--spacing-lg) calc(-1 * var(--spacing-md));
    border-right: none;
    border-left: none;
    border-radius: 0;
  }

  .actions {
    margin: 0 calc(-1 * var(--spacing-md)) var(--spacing-lg);
    padding: 0;
  }

  .actions .btn-primary,
  .sheet-action-row .btn,
  #download-png {
    width: 100%;
    min-height: 56px;
    border-right: none;
    border-left: none;
    border-radius: 0;
  }

  .result-action-group {
    padding-right: 0;
    padding-left: 0;
    border-right: none;
    border-left: none;
    border-radius: 0;
  }

  .result-action-group .result-eyebrow,
  .result-action-group .result-action-note,
  .result-action-group .sheet-custom-actions,
  .result-action-group .sheet-result {
    padding-inline: var(--spacing-md);
  }

  .result {
    padding: 0 var(--spacing-md) var(--spacing-lg);
  }

  .result-panel {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .bottom-ad-area {
    width: 100%;
    padding-top: var(--spacing-xl);
  }

  .ad-banner {
    margin-inline: 0;
    border-radius: 0;
  }

  .site-footer {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
}