* { box-sizing: border-box; }
body {
  background-color: #121212;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0; padding: 12px;
  display: flex; justify-content: center;
}
.container { width: 100%; max-width: 420px; }
h2 { text-align: center; margin-top: 5px; margin-bottom: 15px; color: #00e676; }
.card {
  background: #1e1e1e; padding: 15px; border-radius: 14px; margin-bottom: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
.card h3 { font-size: 13px; color: #aaa; margin: 0 0 10px 0; text-transform: uppercase; letter-spacing: 0.5px; }
.dashboard { background: #2a2a2a; text-align: center; }
.speed-box { font-size: 56px; font-weight: bold; color: #00e676; line-height: 1; margin-bottom: 5px; }
.unit { font-size: 18px; color: #aaa; }
.battery-section { margin-top: 15px; text-align: left; }
.battery-header { display: flex; justify-content: space-between; font-size: 13px; font-weight: bold; margin-bottom: 5px; color: #ddd; }
.battery-bar-bg { width: 100%; height: 12px; background-color: #444; border-radius: 6px; overflow: hidden; }
.battery-fill { height: 100%; background-color: #00e676; transition: width 0.3s ease; }
.status { margin-top: 12px; font-size: 13px; color: #ff9800; font-weight: bold; }
.btn-group { display: flex; gap: 8px; margin-bottom: 8px; }
.btn { flex: 1; padding: 12px 6px; border: none; border-radius: 8px; font-size: 13px; font-weight: bold; cursor: pointer; }
.full-width { width: 100%; display: block; }
.primary { background: #2196f3; color: #fff; }
.success { background: #4caf50; color: #fff; }
.warning { background: #ff9800; color: #fff; }
.danger { background: #f44336; color: #fff; }
.secondary { background: #333; color: #fff; border: 1px solid #444; }
.btn:active { opacity: 0.7; }
.speed-slider-container { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.slider { flex: 1; accent-color: #f44336; }
.speed-badge { font-weight: bold; font-size: 15px; color: #ff9800; min-width: 60px; }
.console-card { background: #181818; }
.console-box {
  background: #0d0d0d; color: #00ff66; font-family: monospace; font-size: 11px;
  padding: 10px; border-radius: 6px; max-height: 120px; overflow-y: auto; white-space: pre-wrap; word-break: break-all;
}