:root {
  --bg: #0f1724;
  --card: #0b1220;
  --muted: #9aa3b2;
  --accent: #64b5f6;
}
* {
  box-sizing: border-box;
}
body {
  font-family: Inter, Segoe UI, Roboto, Arial;
  background: linear-gradient(180deg, #071025 0%, #071b2a 100%);
  color: #e6eef6;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
}
.wrap {
  width: 100%;
  max-width: 1000px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 8px 30px rgba(2, 6, 23, 0.7);
}
h1 {
  margin: 0 0 10px;
  font-size: 18px;
}
.grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
}
.panel {
  background: rgba(255, 255, 255, 0.02);
  padding: 12px;
  border-radius: 10px;
}
label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
select,
input,
textarea {
  width: 100%;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  background: transparent;
  color: inherit;
}
.row {
  display: flex;
  gap: 8px;
}
.row > * {
  flex: 1;
}
.preview-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
}
.box {
  width: 160px;
  height: 160px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1e293b, #0f1724);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}
.controls {
  display: grid;
  gap: 10px;
}
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.preset-btn {
  padding: 6px 8px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.03);
  color: #e6eef6;
  cursor: pointer;
}
.preset-btn.active {
  outline: 2px solid rgba(100, 181, 246, 0.18);
  background: rgba(100, 181, 246, 0.06);
}
button {
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 8px;
  border: 0;
  background: var(--accent);
  color: #072034;
  font-weight: 600;
}
textarea#cssOut {
  height: 200px;
  background: #071022;
  border: 1px solid rgba(255, 255, 255, 0.03);
  color: #cfe9ff;
  padding: 12px;
  border-radius: 8px;
  font-family: monospace;
}
@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .box {
    width: 120px;
    height: 120px;
  }
}