.app {
  width: min(1120px, 100%);
  min-height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  padding: 1.25rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.home-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
  flex-shrink: 0;
}
.home-btn:hover {
  color: var(--text);
  border-color: var(--surface-border-strong);
  background: var(--surface-strong);
}
.home-btn svg { width: 17px; height: 17px; }

.topbar-actions {
  display: inline-flex;
  border: 1px solid var(--surface-border);
  border-radius: 999px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: 0.24rem;
  box-shadow: var(--shadow-md);
}

.mode-btn {
  border: 0;
  border-radius: 999px;
  padding: 0.5rem 0.95rem;
  color: var(--muted);
  background: transparent;
  font-weight: 500;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: color 160ms ease, background 160ms ease;
}

.mode-btn.active {
  color: var(--text);
  background: linear-gradient(180deg, rgba(60, 110, 113, 0.38), rgba(60, 110, 113, 0.14));
}

.mode-btn.listening {
  color: var(--green);
  background: linear-gradient(180deg, rgba(60, 110, 113, 0.35), rgba(60, 110, 113, 0.12));
}

.display-wrap {
  border: 1px solid var(--surface-border-strong);
  background: linear-gradient(160deg, rgba(60, 110, 113, 0.12), rgba(26, 30, 30, 0.94));
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 2.4vw, 2rem);
  min-height: min(52vh, 480px);
  box-shadow: var(--shadow-lg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: border-color 300ms ease, box-shadow 300ms ease;
}

.display-wrap.alarm {
  border-color: rgba(201, 122, 122, 0.65);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(201, 122, 122, 0.2);
  animation: pulse-alarm 1s ease-in-out infinite;
}

@keyframes pulse-alarm {
  0%, 100% { box-shadow: var(--shadow-lg), 0 0 40px rgba(201, 122, 122, 0.12); }
  50% { box-shadow: var(--shadow-lg), 0 0 60px rgba(201, 122, 122, 0.32); }
}

.display-main {
  display: grid;
  place-items: center;
  width: 100%;
}

.status {
  margin: 0.55rem 0 0.1rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

#meterCanvas {
  width: min(420px, 90vw);
  height: auto;
  aspect-ratio: 5 / 3;
}

.level-display {
  margin: 0;
  font-size: clamp(3.5rem, 12vw, 9rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 8px 36px rgba(0, 0, 0, 0.46);
  transition: color 200ms ease;
}

.level-display.zone-green { color: var(--green); }
.level-display.zone-yellow { color: var(--yellow); }
.level-display.zone-red { color: var(--red); }

.streak-display {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.panel {
  border: 1px solid var(--surface-border);
  background: var(--surface);
  border-radius: 0;
  padding: 0.95rem;
  display: grid;
  gap: 0.9rem;
  box-shadow: var(--shadow-md);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

label {
  display: grid;
  gap: 0.42rem;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

input[type="number"] {
  width: 100%;
  border: 1px solid var(--surface-border);
  border-radius: 0;
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.64rem 0.7rem;
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

input[type="number"]:focus {
  border-color: rgba(92, 158, 161, 0.65);
  box-shadow: 0 0 0 4px rgba(60, 110, 113, 0.14);
}

input[type="range"] {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  accent-color: var(--accent);
}

.threshold-controls {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.85rem;
  align-items: start;
}

.range-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.range-value {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  min-width: 2ch;
  text-align: right;
}

.alert-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem;
}

.toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.9rem;
}

.toggle-label input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.preset-btn, .action-btn {
  border: 1px solid var(--surface-border);
  background: linear-gradient(180deg, rgba(60, 110, 113, 0.22), rgba(30, 34, 34, 0.85));
  color: var(--text);
  border-radius: 0;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: transform 120ms ease, border-color 140ms ease, background 140ms ease;
}

.preset-btn:hover, .action-btn:hover {
  border-color: rgba(60, 110, 113, 0.5);
  transform: translateY(-1px);
}

.preset-btn:active, .action-btn:active {
  transform: translateY(0);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.68rem;
}

.help {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.83rem;
}

kbd {
  border: 1px solid var(--surface-border);
  border-radius: 4px;
  padding: 0.16rem 0.42rem;
  background: rgba(26, 30, 30, 0.95);
  color: var(--text);
}

@media (max-width: 700px) {
  .app { padding: 0.9rem; }
  .topbar { justify-content: center; }
  .threshold-controls {
    grid-template-columns: 1fr;
  }
}