/* Mobile Styles – Phones */
@media (max-width: 640px) {
  .hero { padding: 3.5rem 1rem 3rem; }
  .hero h1 { font-size: 1.9rem; line-height: 1.15; }
  .hero p { font-size: 1rem; margin-bottom: 1.5rem; }
  nav { padding: 0 1rem; }
  nav a { margin-left: 0.6rem; font-size: 0.78rem; }
  .logo { font-size: 1rem; }
  .countdown { font-size: 3rem; }
  .controls { flex-direction: column; align-items: stretch; gap: 0.75rem; }
  .controls label { display: flex; justify-content: space-between; align-items: center; font-size: 0.95rem; }
  .btn-secondary { margin-left: 0; margin-top: 0.6rem; display: block; text-align: center; }
  .grid { grid-template-columns: 1fr; gap: 1.25rem; }
  section { padding: 2.5rem 0; }
  .timer-section { padding: 1.25rem; border-radius: 16px; }
  .stats { gap: 0.75rem; justify-content: space-around; }
  .stat-num { font-size: 1.6rem; }
  .card { padding: 1.25rem; }
  .progress-ring { width: 100px; height: 100px; }
  .mode-selector { width: 100%; justify-content: center; }
  .mode-btn { flex: 1; text-align: center; padding: 0.55rem 0.5rem; font-size: 0.9rem; }
  .container { padding: 0 1rem; }
  h2 { font-size: 1.65rem; }
  .live-hint { font-size: 0.95rem; }
}

/* Tablets & iPad (portrait) */
@media (min-width: 641px) and (max-width: 1024px) {
  .hero { padding: 5rem 2rem 4rem; }
  .hero h1 { font-size: 2.6rem; }
  .hero p { font-size: 1.15rem; }
  .container { padding: 0 2rem; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .countdown { font-size: 3.8rem; }
  .timer-section { padding: 2rem; }
  .progress-ring { width: 110px; height: 110px; }
  nav a { margin-left: 1.2rem; }
  section { padding: 4rem 0; }
}

/* iPad Pro & large tablets / small laptops */
@media (min-width: 1025px) and (max-width: 1366px) {
  .container { max-width: 1000px; }
  .hero { padding: 5.5rem 2rem 4.5rem; }
  .countdown { font-size: 4rem; }
  .progress-ring { width: 120px; height: 120px; }
  .grid { grid-template-columns: repeat(3, 1fr); }
  .timer-section { padding: 2.25rem; }
}

/* Very large screens */
@media (min-width: 1600px) {
  .container { max-width: 1200px; }
  .hero h1 { font-size: 3.6rem; }
  .countdown { font-size: 5rem; }
  .progress-ring { width: 140px; height: 140px; }
}

@media (max-width: 768px) {
  .selector-box, .choice-card, .grid > * { min-width: 0; }
  .selector-box, .container, .hero-content { overflow-wrap: anywhere; }
  nav, nav > div:last-child {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .35rem .85rem;
  }
  nav a { margin-left: 0; display: inline-block; padding-block: .25rem; }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
}