:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --line: #d5dce5;
  --text: #142033;
  --muted: #5f6b7d;
  --accent: #1c7ed6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #e5efff 0%, var(--bg) 42%);
}

#root {
  height: 100vh;
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  height: 100%;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 14px;
  overflow: auto;
}

.rightbar {
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 14px;
  overflow: auto;
}

.title {
  margin: 0 0 12px;
  font-size: 18px;
}

.section {
  margin-bottom: 16px;
}

.section h3 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

button,
select,
input,
textarea {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

button {
  cursor: pointer;
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.node-btn {
  text-align: left;
}

.small {
  font-size: 12px;
  color: var(--muted);
}

.flow {
  height: 100%;
}

@media (max-width: 1200px) {
  .app {
    grid-template-columns: 260px 1fr;
    grid-template-rows: 1fr 300px;
  }

  .flow {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .rightbar {
    grid-column: 1;
    grid-row: 2;
    border-left: none;
    border-top: 1px solid var(--line);
  }
}

.custom-node {
  border: 1px solid #bbcadc;
  border-radius: 10px;
  background: #fff;
  min-width: 170px;
  box-shadow: 0 8px 16px rgba(20, 32, 51, 0.08);
}

.custom-node .head {
  padding: 7px 10px;
  border-bottom: 1px solid #e2e8f0;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
}

.custom-node .body {
  padding: 9px 10px;
  font-size: 12px;
}

.node-image-preview {
  display: block;
  width: 72px;
  height: 48px;
  margin-top: 8px;
  border: 1px solid #dbe3ee;
  border-radius: 6px;
  object-fit: cover;
  background: #f8fbff;
}

.msg {
  padding: 8px;
  border-radius: 8px;
  background: #eef3fb;
  border: 1px solid #dae5f5;
  font-size: 12px;
}

.image-preview {
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 4px;
}

.button-editor {
  margin-top: 8px;
  padding: 8px;
  border: 1px dashed var(--line);
  border-radius: 8px;
}