:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d9dee3;
  --accent: #b4f5c2;
  --accent-border: #82c990;
  --text: #1c2630;
  --muted: #6b7785;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-header {
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 22px;
}

.app-header p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) 1.2fr;
  gap: 20px;
  padding: 20px 28px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
}

.panel h2 {
  font-size: 15px;
  margin: 0;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 6px 0 12px;
}

.add-buttons button,
.actions button,
.block-tools button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 7px;
  padding: 7px 12px;
  font-size: 13px;
}

.add-buttons button:hover,
.actions button:hover {
  background: var(--accent);
  border-color: var(--accent-border);
}

.blocks {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 8px;
}

.block {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fbfcfd;
}

.block-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.block-tools .label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.block-tools .group button {
  padding: 2px 8px;
  margin-left: 4px;
}

.block textarea,
.block input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}

.block.subtitle input {
  font-weight: 700;
  font-size: 16px;
}

.empty-hint {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 14px;
}

.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
  color: var(--muted);
}

.field input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-size: 14px;
}

.warn {
  display: block;
  color: #b54708;
  font-size: 12px;
  margin-top: 4px;
}

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 6px;
}

.status {
  font-size: 13px;
  color: var(--muted);
}

.preview iframe {
  width: 100%;
  height: 720px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 12px;
  background: #fafeff;
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
  }
}