/* Breathing Compass - full-screen dark, mobile-first (390x844 safe) */
:root {
  --bg: #111827;
  --ambient: #111827;
  --accent: #2dd4bf;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --orb: #2dd4bf;
  --orb-glow: rgba(45, 212, 191, 0.5);
  --scale: 1;
  --ring-p: 0;
  --transition: 0.9s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--ambient);
  color: var(--text);
  transition: background-color 1.2s ease-in-out;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: max(1rem, env(safe-area-inset-top)) 1.25rem max(1rem, env(safe-area-inset-bottom));
  gap: 1rem;
}

.app-header { text-align: center; padding-top: 0.5rem; }

.app-header h1 {
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tagline {
  color: var(--muted);
  font-size: 1rem;
  margin-top: 0.35rem;
}

.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  min-height: 46vh;
}

.orb-wrap { position: relative; width: min(64vw, 300px); aspect-ratio: 1; }

.session-ring {
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) calc(var(--ring-p) * 1%), rgba(255,255,255,0.08) 0);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
}

.pulse-orb {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.35), var(--orb) 62%);
  box-shadow: 0 0 42px 6px var(--orb-glow);
  transform: scale(var(--scale));
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.pulse-core {
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.5), transparent 70%);
  opacity: 0.55;
  animation: core-pulse 4s ease-in-out infinite;
}

@keyframes core-pulse {
  0%, 100% { transform: scale(0.92); opacity: 0.4; }
  50% { transform: scale(1.08); opacity: 0.7; }
}

.readout { text-align: center; }

.phase-label {
  font-size: clamp(1.5rem, 7vw, 2rem);
  font-weight: 600;
  min-height: 1.3em;
}

.count-label {
  color: var(--muted);
  font-size: 1.05rem;
  margin-top: 0.4rem;
  font-variant-numeric: tabular-nums;
}

.controls { display: flex; flex-direction: column; gap: 0.75rem; }

.preset-row, .action-row { display: flex; gap: 0.75rem; }

.btn {
  flex: 1;
  min-height: 54px;
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  touch-action: manipulation;
}

.btn:active { transform: scale(0.97); }

.btn[aria-pressed='true'] { border-color: var(--accent); background: rgba(45,212,191,0.16); color: var(--accent); }

.btn.primary { background: var(--accent); color: #0b1220; border-color: var(--accent); }

.btn:disabled { opacity: 0.45; cursor: default; }

.session-row { display: flex; align-items: center; gap: 0.75rem; }

.session-label { font-size: 1rem; color: var(--muted); }

.session-select {
  flex: 1;
  min-height: 54px;
  padding: 0 0.75rem;
  appearance: none;
  text-align: center;
}

.session-select option { background: #1f2937; color: var(--text); }

.app-footer {
  text-align: center;
  padding: 0.5rem 0 0.25rem;
  font-size: 0.85rem;
  opacity: 0.75;
}

.app-footer a { color: var(--accent); text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}