:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --danger: #dc2626;
  --soft: #eef2ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.shell { max-width: 1600px; margin: 0 auto; padding: 24px; }
h1, h2, h3 { margin: 0 0 8px; }
h2 { font-size: 20px; }
h3 { font-size: 16px; }
a { color: inherit; text-decoration: none; }
small { font-size: 12px; }
.muted { color: var(--muted); }
.hint { color: var(--muted); }
.spacer { flex: 1; }
.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}
.topbar-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.back-link { display: inline-block; margin-bottom: 8px; color: var(--primary); }
.card, .auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
}
.card { padding: 20px; }
.auth-card {
  max-width: 420px;
  margin: 72px auto;
  padding: 28px;
}
.stack { display: grid; gap: 14px; }
.grid { display: grid; gap: 16px; }
.cards { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.editor-grid {
  display: grid;
  grid-template-columns: minmax(620px, 1.2fr) minmax(380px, 0.9fr);
  gap: 20px;
  align-items: start;
}
.left-column, .right-column { align-content: start; }
label { display: grid; gap: 6px; font-size: 14px; }
input, select, button, summary {
  font: inherit;
}
input, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: white;
  padding: 11px 12px;
}
input[type="color"] {
  padding: 6px;
  min-height: 46px;
}
input[type="range"] {
  padding: 0;
}
button, .button {
  border: none;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  padding: 11px 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.button.secondary { background: #111827; }
.button.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.button.danger { background: var(--danger); }
.button.small { padding: 8px 12px; font-size: 14px; }
.alert {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 16px;
}
.link-card {
  min-height: 180px;
  display: flex;
  flex-direction: column;
}
.card-title, .block-row-title {
  font-weight: 700;
}
.card-meta { color: var(--muted); font-size: 14px; }
.form-section {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  background: linear-gradient(180deg, #fff, #fcfcff);
}
.collapsible {
  padding-top: 14px;
}
.summary-heading {
  list-style: none;
  cursor: pointer;
  user-select: none;
  margin: -4px 0 0;
  padding-right: 34px;
  position: relative;
}
.summary-heading::-webkit-details-marker { display: none; }
.summary-heading::after {
  content: '▾';
  position: absolute;
  right: 0;
  top: 2px;
  color: var(--muted);
  font-size: 18px;
  transition: transform 0.2s ease;
}
.collapsible:not([open]) .summary-heading::after {
  transform: rotate(-90deg);
}
.section-heading { margin-bottom: 14px; }
.section-body { margin-top: 8px; }
.form-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.sticky-actions {
  position: sticky;
  bottom: 12px;
  background: rgba(255,255,255,0.96);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  backdrop-filter: blur(8px);
}
.form-status {
  font-size: 14px;
}
.blocks-list { display: grid; gap: 10px; }
.block-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
}
.section-gap { margin-top: 20px; }
.check { display: flex; align-items: center; gap: 8px; }
.check input { width: auto; }
.asset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.asset-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 12px;
  background: #fff;
}
.asset-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.asset-preview {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #f8fafc;
  object-fit: cover;
  display: block;
}
.background-preview { aspect-ratio: 16 / 9; }
.logo-preview { aspect-ratio: 16 / 9; object-fit: contain; padding: 16px; }
.asset-meta {
  font-size: 13px;
  color: var(--muted);
  word-break: break-word;
}
.empty-asset {
  border: 1px dashed var(--border);
  border-radius: 14px;
  min-height: 160px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  padding: 16px;
}
.preview-card { gap: 16px; }
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}
.preview-frame {
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  background: #fff;
  min-height: 220px;
}
.preview-image {
  width: 100%;
  display: block;
  background: #fff;
}
@media (max-width: 1280px) {
  .editor-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .cols-2, .asset-grid { grid-template-columns: 1fr; }
  .topbar, .preview-header, .form-actions { flex-direction: column; }
  .shell { padding: 14px; }
}


.block-card {
  border: 1px solid var(--border-color, #e3e7ee);
  border-radius: 18px;
  background: #fff;
  overflow: hidden;
}
.block-card + .block-card {
  margin-top: 10px;
}
.block-card .section-body {
  padding: 0 16px 16px;
}
.summary-heading {
  cursor: pointer;
  list-style: none;
}
.summary-heading::-webkit-details-marker {
  display: none;
}
.block-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
}
.block-row .topbar-actions {
  flex-shrink: 0;
}