:root {
  --bg-0: #06080f;
  --bg-1: #0a1024;
  --panel: rgba(11, 18, 42, 0.78);
  --text: #d6f3ff;
  --muted: #8fb2ca;
  --accent-cyan: #4ce8ff;
  --accent-lime: #5aff96;
  --accent-rose: #ff4d6d;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: radial-gradient(circle at 20% 20%, #0f1f42 0%, var(--bg-1) 35%, var(--bg-0) 100%);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

#app {
  width: 100%;
  height: 100%;
  display: block;
}

.overlay {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 10;
  pointer-events: none;
}

.panel {
  width: min(320px, calc(100vw - 32px));
  border: 1px solid rgba(132, 206, 255, 0.35);
  background: linear-gradient(150deg, rgba(20, 37, 80, 0.78), var(--panel));
  border-radius: 14px;
  padding: 14px 16px;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 24px rgba(76, 232, 255, 0.18), inset 0 0 20px rgba(76, 232, 255, 0.08);
}

h1 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 5px 0 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
}

.metric-row strong {
  color: var(--accent-cyan);
  font-size: 1.06rem;
}

#receptionStateLabel {
  color: #9cb6ff;
  letter-spacing: 0.01em;
}

#resonanceFreqLabel {
  color: #8ff7d2;
}

.bar-group {
  margin-bottom: 8px;
}

.bar-group label {
  font-size: 0.82rem;
  color: var(--muted);
}

.bar-shell {
  margin-top: 4px;
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: rgba(20, 34, 60, 0.95);
  border: 1px solid rgba(163, 205, 237, 0.2);
  overflow: hidden;
}

.bar {
  width: 0%;
  height: 100%;
  transition: width 120ms linear;
}

.bar-tx {
  background: linear-gradient(90deg, #17f2ff, var(--accent-lime));
  box-shadow: 0 0 10px rgba(90, 255, 150, 0.6);
}

.bar-rx {
  background: linear-gradient(90deg, #ff9a3d, var(--accent-rose));
  box-shadow: 0 0 10px rgba(255, 77, 109, 0.6);
}

.bar-recv {
  background: linear-gradient(90deg, #6ba8ff, #9f7bff);
  box-shadow: 0 0 10px rgba(159, 123, 255, 0.6);
}

.hint {
  margin: 10px 0 2px;
  font-size: 0.76rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .overlay {
    top: auto;
    left: 10px;
    right: 10px;
    bottom: 10px;
  }

  .panel {
    width: 100%;
  }
}