/* ==========================================================
   responsive.css — Mobile-first breakpoints
   Tested viewports: 320, 360, 375, 390, 393, 412, 430, 768, 1024
   ========================================================== */

/* Default styles are already mobile-first */

/* Hide sidebar on small screens, show bottom nav */
@media (max-width: 960px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    height: 100dvh;
    transform: translateX(-100%);
    transition: transform 0.3s var(--ease);
    z-index: 50;
    width: 280px;
    box-shadow: 0 0 80px rgba(0, 0, 0, 0.7);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-btn {
    display: inline-flex;
  }

  .bottom-nav {
    display: flex;
  }

  .app {
    grid-template-columns: 1fr;
  }

  .page-container {
    padding: 16px;
    padding-bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + 24px);
  }
}

/* Sidebar backdrop overlay */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 0.2s var(--ease);
}

.sidebar-backdrop.show {
  display: block;
}

/* ---------- Small phones (320-360) ---------- */
@media (max-width: 380px) {
  .page-container {
    padding: 12px;
    padding-bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + 20px);
  }

  .notes-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .note-btn {
    min-height: 60px;
    padding: 8px 2px;
  }

  .note-btn .note-sym {
    font-size: 18px;
  }

  .note-btn .note-en {
    font-size: 8.5px;
  }

  .hero-title {
    font-size: 38px;
  }

  .hero-note {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .stat-tile-val {
    font-size: 22px;
  }

  .pitch-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .stat-card {
    padding: 10px;
  }

  .stat-value {
    font-size: 16px;
  }

  .controls-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .ctrl-btn {
    min-height: 60px;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }

  .piano {
    height: 150px;
  }

  .piano-key {
    flex: 1 0 32px;
    min-width: 32px;
  }

  .piano-key.black {
    flex: 0 0 22px;
    min-width: 22px;
  }

  .tanpura-icon {
    width: 100px;
    height: 100px;
    font-size: 42px;
  }

  .bpm-display {
    font-size: 64px;
  }

  .metronome {
    padding: 16px 12px;
  }

  .modal {
    padding: 18px;
    border-radius: var(--r-lg);
  }

  .challenge-hero {
    padding: 18px;
  }

  .breath-circle {
    width: 220px;
    height: 220px;
  }

  .breath-text {
    font-size: 22px;
  }

  .topbar {
    padding: 10px 12px;
    padding-top: calc(10px + var(--safe-top));
  }

  .topbar-page {
    font-size: 16px;
  }

  .streak-pill,
  .xp-pill {
    padding: 5px 9px;
    font-size: 11px;
  }

  .level-step {
    min-width: 60px;
  }
}

/* ---------- Standard phones (380-560) ---------- */
@media (min-width: 381px) and (max-width: 560px) {
  .notes-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quick-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- Large phones / small tablets (560-768) ---------- */
@media (min-width: 561px) and (max-width: 768px) {
  .notes-row {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .pitch-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- Tablet / Desktop ---------- */
@media (min-width: 769px) {
  .notes-row {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .features {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .pitch-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .hero-mock-inner {
    padding: 24px;
  }

  .piano {
    height: 200px;
  }

  .piano-key {
    flex: 1 0 44px;
    min-width: 44px;
  }

  .piano-key.black {
    flex: 0 0 30px;
    min-width: 30px;
  }
}

@media (min-width: 1024px) {
  .features {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- Landscape phones ---------- */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: 24px 0;
  }
  .hero-title {
    font-size: 32px;
  }
  .pitch-stage {
    padding: 14px;
  }
  .target-note-name {
    font-size: 48px;
  }
  .detected-name {
    font-size: 36px;
  }
  .waveform-wrap {
    height: 70px;
  }
  .mic-controls {
    position: static;
  }
}

/* ---------- High-density / safe areas ---------- */
@supports (padding: max(0px)) {
  .bottom-nav {
    padding-bottom: max(var(--safe-bottom), 6px);
  }
  .topbar {
    padding-top: max(var(--safe-top), 12px);
  }
}

/* ---------- Print ---------- */
@media print {
  .sidebar, .topbar, .bottom-nav, .loader { display: none; }
  body { background: #fff; color: #000; }
}