:root {
  --bg: #0b0f14;
  --panel: #121820;
  --panel-2: #171f2a;
  --border: #263241;
  --text: #e6edf3;
  --text-dim: #8b98a5;
  --accent: #35c2e8;
  --accent-dim: #1c6f85;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top left, #0e1520, var(--bg) 60%);
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
}

#app { max-width: 1000px; margin: 0 auto; padding: 24px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.topbar h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar h1 .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.topbar .sub {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--mono);
  border: 1px solid var(--border);
  background: var(--panel-2);
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 20px;
}

.card h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin: 0 0 16px 0;
}

/* --- Hero card: truck visualization + weigh controls --- */

.hero { padding: 28px; }

.scene {
  position: relative;
  height: 110px;
  border-radius: 12px;
  background: repeating-linear-gradient(90deg, #0d1420, #0d1420 18px, #121a28 18px, #121a28 36px);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 18px;
}

.scene .platform {
  position: absolute;
  left: calc(50% - 60px);
  bottom: 0;
  width: 120px;
  height: 10px;
  background: var(--accent-dim);
  border-top: 2px solid var(--accent);
  opacity: 0.7;
}

.scene .platform-label {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scene .truck {
  position: absolute;
  bottom: 18px;
  font-size: 44px;
  transform: translateX(-50%) scaleX(-1);
  transition: left 0.3s linear;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.4));
}

.scene .truck.settled { filter: drop-shadow(0 0 10px var(--good)); }
.scene .truck.moving { animation: bob 0.35s infinite ease-in-out; }

@keyframes bob { 0%,100% { bottom: 18px; } 50% { bottom: 21px; } }

.scene .empty-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 13px;
  font-family: var(--mono);
}

.status-caption {
  text-align: center;
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 20px;
  font-family: var(--mono);
}
.status-caption.stable { color: var(--good); }
.status-caption.moving { color: var(--warn); }

.readout {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}

.readout .value {
  font-family: var(--mono);
  font-size: 64px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  text-shadow: 0 0 24px rgba(53, 194, 232, 0.25);
}

.readout .unit {
  font-family: var(--mono);
  font-size: 22px;
  color: var(--text-dim);
}

.weigh-form {
  display: flex;
  gap: 12px;
  align-items: stretch;
}

.weigh-form input[type="number"] {
  flex: 1;
  min-width: 0;
  font-size: 24px;
  padding: 16px 18px;
  text-align: center;
}

.weigh-form button {
  flex: 0 0 auto;
  font-size: 15px;
  padding: 0 28px;
}

.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-family: var(--mono);
}

input[type="number"], input[type="text"], select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 10px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 14px;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }

.row { display: flex; gap: 10px; align-items: end; }
.row > * { flex: 1; }

button {
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: #eafcff;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
button:hover { background: var(--accent); color: #041014; }
button:active { transform: scale(0.98); }
button.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
button.secondary:hover { border-color: var(--text-dim); background: var(--panel-2); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

.secondary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.auto-cycle { display: flex; align-items: center; gap: 10px; }
.auto-cycle .range { font-family: var(--mono); font-size: 12px; color: var(--text-dim); }
.auto-cycle .range input {
  width: 80px; display: inline-block; padding: 4px 6px; font-size: 12px;
}

.switch {
  position: relative; width: 42px; height: 24px;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer; transition: background 0.15s; flex: 0 0 auto;
}
.switch.on { background: var(--accent-dim); border-color: var(--accent); }
.switch .knob {
  position: absolute; top: 2px; left: 2px; width: 18px; height: 18px;
  border-radius: 50%; background: var(--text-dim); transition: left 0.15s, background 0.15s;
}
.switch.on .knob { left: 20px; background: var(--accent); }

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

/* --- Advanced (collapsible) --- */

.advanced-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
  padding: 10px 4px;
}
.advanced-toggle:hover { color: var(--text); }
.advanced-toggle .chevron { transition: transform 0.15s; }
.advanced-toggle .chevron.open { transform: rotate(90deg); }

.advanced-body { padding-top: 10px; }

.frame-log {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  max-height: 200px;
  overflow-y: auto;
  background: #0a0e13;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
}
.frame-log .line { white-space: nowrap; padding: 2px 0; border-bottom: 1px dashed #1a2330; }
.frame-log .line:last-child { border-bottom: none; }
.frame-log .t { color: var(--accent-dim); margin-right: 8px; }

.hint { color: var(--text-dim); font-size: 12px; margin-top: 6px; }

footer.hint { text-align: center; margin-top: 20px; margin-bottom: 4px; }