body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #111827 0, #030712 55%, #020617 100%);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* App shell */

.app-header {
  width: 100%;
  max-width: 960px;
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-md);
}

.app-title {
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0;
}

.app-subtitle {
  margin: var(--spacing-xs) 0 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.app-main {
  width: 100%;
  max-width: 960px;
  padding: 0 var(--spacing-lg) var(--spacing-xl);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-gap: var(--spacing-xl);
}

.app-footer {
  width: 100%;
  max-width: 960px;
  padding: 0 var(--spacing-lg) var(--spacing-xl);
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

/* Main / sidebar */

.metronome-main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.metronome-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

/* Visual area */

.visual-and-transport {
  background: linear-gradient(145deg, #020617, #020617 40%, #111827 100%);
  border-radius: 20px;
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.visual-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.beat-indicator {
  display: flex;
  gap: var(--spacing-sm);
}

/* Panels */

.panel {
  background: radial-gradient(circle at top left, #1f2933 0, #020617 52%);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

.panel-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.panel-header h2 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin: 0;
}

/* BPM panel */

.bpm-panel .panel-header {
  align-items: center;
}

.bpm-display {
  font-size: 2.4rem;
  font-weight: 600;
}

.bpm-unit {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
}

/* Fields */

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: var(--spacing-md);
}

.field-group:last-child {
  margin-bottom: 0;
}

.field-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
}

.field-help {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.inline-field {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.field-suffix {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.toggle-row {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

/* Transport / timer */

.transport-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.practice-timer {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.timer-row {
  display: grid;
  grid-template-columns: 1.2fr auto auto;
  gap: var(--spacing-sm);
  align-items: center;
}

.timer-display {
  min-width: 4rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.overload-status {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--spacing-sm);
}