.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  min-height: var(--header-height);
  border-bottom: 1px solid color-mix(in srgb, var(--border-default) 82%, transparent);
  background: color-mix(in srgb, var(--bg-canvas) 92%, transparent);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text-primary);
  font-size: 1.12rem;
  font-weight: 580;
  text-decoration: none;
  letter-spacing: -0.035em;
}

.brand-icon {
  width: 2rem;
  height: 2rem;
  flex: 0 0 2rem;
  border-radius: 0.55rem;
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-toggle,
.theme-toggle {
  display: inline-grid;
  place-items: center;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition:
    background-color var(--motion-fast) var(--easing-standard),
    border-color var(--motion-fast) var(--easing-standard);
}

.nav-toggle:hover,
.theme-toggle:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.site-nav {
  position: absolute;
  inset: var(--header-height) 1rem auto;
  display: none;
  padding: var(--space-3);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  background: var(--bg-surface-raised);
  box-shadow: var(--shadow-md);
}

.site-nav[data-open="true"] {
  display: block;
}

.site-nav ul {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--primary-soft);
  color: var(--text-primary);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.7rem 1.05rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--motion-fast) var(--easing-standard),
    border-color var(--motion-fast) var(--easing-standard),
    color var(--motion-fast) var(--easing-standard);
}

.button--primary {
  background: var(--primary);
  color: var(--on-primary);
}

.button--primary:hover {
  background: var(--primary-hover);
  color: var(--on-primary);
}

.button--primary:active {
  background: var(--primary-active);
}

.button--secondary {
  border-color: var(--border-default);
  background: var(--bg-surface);
  color: var(--text-primary);
}

.button--secondary:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.button[disabled] {
  cursor: not-allowed;
  background: var(--bg-subtle);
  color: var(--text-muted);
  border-color: var(--border-default);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 650;
}

.status-badge::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--primary);
}

.mestro-line {
  width: 2px;
  border-radius: 999px;
  background: var(--primary);
}

.app-frame {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border-default);
  border-radius: 1rem;
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.app-frame__bar {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  height: 2.45rem;
  padding-inline: 0.8rem;
  border-bottom: 1px solid var(--border-default);
  background: var(--bg-surface-raised);
}

.app-frame__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--border-strong);
}

.app-frame__body {
  min-width: 0;
  min-height: 23rem;
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
}

.app-rail {
  display: grid;
  align-content: start;
  gap: 0.65rem;
  padding: 1rem 0.65rem;
  border-right: 1px solid var(--border-default);
  background: var(--bg-subtle);
}

.app-rail span {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.app-rail span[aria-current="page"] {
  border-color: var(--border-default);
  background: var(--primary-soft);
  box-shadow: inset 2px 0 0 var(--primary);
}

.app-canvas {
  min-width: 0;
  padding: 1.1rem;
  overflow: hidden;
}

.ui-heading {
  width: 52%;
  height: 0.8rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  background: var(--text-primary);
  opacity: 0.86;
}

.ui-copy {
  width: 72%;
  height: 0.45rem;
  margin-bottom: 0.45rem;
  border-radius: 999px;
  background: var(--border-strong);
}

.ui-copy--short {
  width: 44%;
}

.ui-sheet-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1.25rem;
}

.ui-sheet {
  min-height: 10rem;
  padding: 0.65rem;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: #fff;
}

html[data-theme="dark"] .ui-sheet {
  background: #f8f7f2;
}

.ui-sheet::before,
.ui-sheet::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: 1rem;
  background: #c8c8c2;
  box-shadow: 0 1rem 0 #d4d4cf, 0 2rem 0 #d4d4cf, 0 3rem 0 #d4d4cf;
}

.preview-label {
  display: inline-flex;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.world-visual {
  min-height: 24rem;
  position: relative;
}

.preview-list {
  display: grid;
  gap: 0.65rem;
  margin-top: 1.2rem;
}

.preview-row {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-default);
}

.preview-row:last-child {
  border-bottom: 0;
}

.preview-thumb {
  width: 2.5rem;
  aspect-ratio: 0.72;
  border: 1px solid var(--border-default);
  border-radius: 0.3rem;
  background: linear-gradient(var(--bg-surface-raised), var(--bg-surface));
}

.preview-row > div {
  min-width: 0;
}

.preview-row strong {
  display: block;
  font-size: 0.88rem;
}

.preview-row small {
  color: var(--text-muted);
}

.preview-chip {
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 700;
}

.flow {
  display: grid;
  gap: 0;
  margin-top: var(--space-5);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}

.flow-step {
  display: grid;
  grid-template-columns: 2px 1fr;
  gap: 1rem;
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--border-default);
}

.flow-step:last-child {
  border-bottom: 0;
}

.flow-step .mestro-line {
  min-height: 2.5rem;
}

.flow-step strong {
  display: block;
  margin-bottom: 0.15rem;
}

.flow-step span {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.form-field {
  display: grid;
  gap: 0.45rem;
}

.form-field label {
  font-weight: 700;
  font-size: 0.92rem;
}

.form-field input,
.form-field select {
  min-height: 3rem;
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-surface-raised);
  color: var(--text-primary);
}

.form-field input:focus-visible,
.form-field select:focus-visible {
  border-color: var(--primary);
}

.form-help {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.form-status {
  min-height: 1.5rem;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-status[data-state="error"] {
  color: var(--error);
}

.form-status[data-state="success"] {
  color: var(--success);
}

.form-status[data-state="info"] {
  color: var(--info);
}

.site-footer {
  padding-block: 2.5rem;
  border-top: 1px solid var(--border-default);
}

.footer-inner {
  display: grid;
  gap: 1.25rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.footer-meta {
  color: var(--text-muted);
  font-size: 0.86rem;
}

@media (min-width: 48rem) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: block;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-nav ul {
    display: flex;
    align-items: center;
    gap: 0.1rem;
  }

  .site-nav a {
    padding: 0.55rem 0.7rem;
  }

  .footer-inner {
    grid-template-columns: 1fr auto;
    align-items: end;
  }
}