/* =====================================================
   iPhone-Optimized Styles for Guitar Practice Journal
   Supports iPhone 12/13/14/15 (Pro/Pro Max/Standard/Mini)
   ===================================================== */

/* ===== iPhone Viewport Sizes Reference =====
   iPhone 15 Pro Max: 430 x 932px (1290 x 2796 @ 3x)
   iPhone 15 Pro/15: 393 x 852px (1179 x 2556 @ 3x)
   iPhone 15 Plus: 430 x 932px (1290 x 2796 @ 3x)
   iPhone 14/13/12: 390 x 844px (1170 x 2532 @ 3x)
   iPhone 14/13/12 mini: 375 x 812px (1080 x 2340 @ 3x)
   iPhone SE: 375 x 667px (750 x 1334 @ 2x)
*/

/* ===== CSS Variables for iPhone =====*/
:root {
  /* Safe area insets for notch/dynamic island */
  --iphone-safe-top: env(safe-area-inset-top, 20px);
  --iphone-safe-bottom: env(safe-area-inset-bottom, 34px);
  --iphone-safe-left: env(safe-area-inset-left, 0px);
  --iphone-safe-right: env(safe-area-inset-right, 0px);

  /* Touch-optimized spacing */
  --touch-target-min: 44px;
  --touch-spacing: 8px;

  /* Mobile-first sizing */
  --mobile-header-height: 60px;
  --mobile-nav-height: 56px;
  --mobile-footer-height: 80px;

  /* Dynamic font scaling */
  --mobile-text-xs: clamp(0.75rem, 2.5vw, 0.875rem);
  --mobile-text-sm: clamp(0.875rem, 3vw, 1rem);
  --mobile-text-base: clamp(1rem, 3.5vw, 1.125rem);
  --mobile-text-lg: clamp(1.125rem, 4vw, 1.25rem);
  --mobile-text-xl: clamp(1.25rem, 4.5vw, 1.5rem);
  --mobile-text-2xl: clamp(1.5rem, 5vw, 2rem);
}

/* ===== Global Mobile Reset ===== */
@media screen and (max-width: 430px) {
  * {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
  }

  input, textarea {
    -webkit-user-select: text;
    user-select: text;
  }

  /* Prevent bounce scrolling on iOS */
  html, body {
    overscroll-behavior: none;
    position: fixed;
    width: 100%;
    height: 100%;
  }

  #app {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
}

/* ===== iPhone Notch/Dynamic Island Safe Areas ===== */
@media screen and (max-width: 430px) {
  .app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: calc(var(--mobile-header-height) + var(--iphone-safe-top));
    padding-top: var(--iphone-safe-top);
    z-index: 9999;
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 0.5px solid rgba(255, 255, 255, 0.1);
  }

  .main-content {
    position: absolute;
    top: calc(var(--mobile-header-height) + var(--iphone-safe-top));
    left: 0;
    right: 0;
    bottom: calc(var(--mobile-nav-height) + var(--iphone-safe-bottom));
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
  }

  /* Pull to refresh area */
  .main-content::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 0;
    right: 0;
    height: 100px;
  }
}

/* ===== Bottom Navigation Bar (iPhone Style) ===== */
@media screen and (max-width: 430px) {
  .top-navigation {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    top: auto !important;
    height: calc(var(--mobile-nav-height) + var(--iphone-safe-bottom)) !important;
    padding-bottom: var(--iphone-safe-bottom) !important;
    background: rgba(var(--bg-primary-rgb), 0.95) !important;
    backdrop-filter: blur(20px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
    border-top: 0.5px solid rgba(255, 255, 255, 0.1) !important;
    display: flex !important;
    flex-direction: row !important;
    justify-content: space-around !important;
    align-items: center !important;
    padding-left: var(--iphone-safe-left) !important;
    padding-right: var(--iphone-safe-right) !important;
    box-shadow: none !important;
  }

  .tab-nav {
    display: flex !important;
    flex-direction: row !important;
    justify-content: space-around !important;
    align-items: center !important;
    width: 100% !important;
    height: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
    gap: 0 !important;
  }

  .tab-nav-item {
    flex: 1 !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 4px !important;
    padding: 0 !important;
    margin: 0 !important;
    min-height: var(--touch-target-min) !important;
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    color: var(--text-secondary) !important;
    transition: color 0.2s ease !important;
    position: relative !important;
  }

  .tab-nav-item.active {
    color: var(--primary) !important;
  }

  .tab-nav-item .icon {
    font-size: 20px !important;
    line-height: 1 !important;
  }

  .tab-nav-item span:not(.icon) {
    font-size: 10px !important;
    font-weight: 500 !important;
    letter-spacing: 0.5px !important;
  }

  /* Hide less important tabs on smaller screens */
  @media screen and (max-width: 375px) {
    .tab-nav-item.hide-mobile {
      display: none !important;
    }
  }
}

/* ===== Practice Interface Mobile Optimization ===== */
@media screen and (max-width: 430px) {
  /* Timer Display */
  .timer-display {
    font-size: clamp(48px, 12vw, 64px) !important;
    font-weight: 700 !important;
    text-align: center !important;
    padding: 24px 16px !important;
    background: var(--bg-secondary) !important;
    border-radius: 16px !important;
    margin: 16px !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1) !important;
  }

  /* Control Buttons */
  .timer-controls {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px !important;
    padding: 0 16px 16px !important;
  }

  .timer-controls button,
  .btn {
    min-height: 52px !important;
    border-radius: 12px !important;
    font-size: var(--mobile-text-base) !important;
    font-weight: 600 !important;
    padding: 12px 20px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    transition: all 0.2s ease !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
  }

  .btn-primary {
    background: var(--primary) !important;
    color: white !important;
  }

  .btn-primary:active {
    transform: scale(0.96) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12) !important;
  }

  /* Session name input */
  .session-input-group {
    padding: 16px !important;
  }

  .session-input-group input {
    width: 100% !important;
    height: 48px !important;
    padding: 12px 16px !important;
    font-size: var(--mobile-text-base) !important;
    border-radius: 12px !important;
    border: 1px solid var(--border) !important;
    background: var(--bg-secondary) !important;
  }

  /* Practice area selector */
  .practice-area-selector {
    padding: 0 16px !important;
  }

  .practice-area-selector select {
    width: 100% !important;
    height: 48px !important;
    padding: 12px 16px !important;
    font-size: var(--mobile-text-base) !important;
    border-radius: 12px !important;
    border: 1px solid var(--border) !important;
    background: var(--bg-secondary) !important;
    -webkit-appearance: none !important;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23999' stroke-width='1.5' fill='none'/%3E%3C/svg%3E") !important;
    background-repeat: no-repeat !important;
    background-position: right 16px center !important;
    padding-right: 40px !important;
  }
}

/* ===== Audio Player Mobile ===== */
@media screen and (max-width: 430px) {
  .audio-player-container {
    padding: 16px !important;
  }

  .waveform-container {
    height: 80px !important;
    margin: 16px 0 !important;
    border-radius: 12px !important;
    overflow: hidden !important;
    background: var(--bg-secondary) !important;
  }

  .audio-controls {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 8px !important;
    margin: 16px 0 !important;
  }

  .audio-control-btn {
    height: 48px !important;
    border-radius: 12px !important;
    font-size: 18px !important;
    background: var(--bg-secondary) !important;
    border: none !important;
    color: var(--text-primary) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
  }

  .audio-control-btn.play-btn {
    grid-column: 2 !important;
    background: var(--primary) !important;
    color: white !important;
    font-size: 24px !important;
  }

  /* Speed controls */
  .speed-controls {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    padding: 12px !important;
    background: var(--bg-secondary) !important;
    border-radius: 12px !important;
  }

  .speed-slider {
    flex: 1 !important;
    height: 40px !important;
    -webkit-appearance: none !important;
    background: transparent !important;
  }

  .speed-slider::-webkit-slider-track {
    height: 4px !important;
    background: var(--border) !important;
    border-radius: 2px !important;
  }

  .speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    width: 24px !important;
    height: 24px !important;
    border-radius: 12px !important;
    background: var(--primary) !important;
    margin-top: -10px !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2) !important;
  }

  .speed-display {
    min-width: 60px !important;
    text-align: center !important;
    font-weight: 600 !important;
    font-size: var(--mobile-text-sm) !important;
  }
}

/* ===== Metronome Mobile ===== */
@media screen and (max-width: 430px) {
  .metronome-container {
    padding: 16px !important;
  }

  .bpm-display {
    font-size: clamp(36px, 10vw, 48px) !important;
    font-weight: 700 !important;
    text-align: center !important;
    padding: 20px !important;
    background: var(--bg-secondary) !important;
    border-radius: 16px !important;
    margin-bottom: 16px !important;
  }

  .bpm-display .bpm-value {
    display: block !important;
    font-size: clamp(48px, 12vw, 64px) !important;
    color: var(--primary) !important;
  }

  .bpm-display .bpm-label {
    display: block !important;
    font-size: var(--mobile-text-sm) !important;
    color: var(--text-secondary) !important;
    margin-top: 4px !important;
  }

  .tempo-slider-container {
    padding: 16px !important;
    background: var(--bg-secondary) !important;
    border-radius: 12px !important;
    margin-bottom: 16px !important;
  }

  .tempo-slider {
    width: 100% !important;
    height: 48px !important;
  }

  .tempo-presets {
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 8px !important;
    margin-bottom: 16px !important;
  }

  .tempo-preset-btn {
    height: 40px !important;
    border-radius: 8px !important;
    font-size: var(--mobile-text-sm) !important;
    font-weight: 600 !important;
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border) !important;
    color: var(--text-primary) !important;
  }

  .tempo-preset-btn.active {
    background: var(--primary) !important;
    color: white !important;
    border-color: var(--primary) !important;
  }

  .time-signature-selector {
    display: flex !important;
    gap: 8px !important;
    justify-content: center !important;
    margin-bottom: 16px !important;
  }

  .time-signature-btn {
    padding: 8px 16px !important;
    border-radius: 8px !important;
    font-size: var(--mobile-text-sm) !important;
    font-weight: 600 !important;
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border) !important;
    color: var(--text-primary) !important;
  }

  .time-signature-btn.active {
    background: var(--primary) !important;
    color: white !important;
    border-color: var(--primary) !important;
  }
}

/* ===== Modals & Dialogs Mobile ===== */
@media screen and (max-width: 430px) {
  .modal-overlay {
    padding: 0 !important;
    display: flex !important;
    align-items: flex-end !important;
  }

  .modal-content {
    width: 100% !important;
    max-width: 100% !important;
    max-height: calc(100vh - var(--iphone-safe-top) - 20px) !important;
    margin: 0 !important;
    border-radius: 24px 24px 0 0 !important;
    padding-bottom: var(--iphone-safe-bottom) !important;
    animation: slideUp 0.3s ease !important;
  }

  @keyframes slideUp {
    from {
      transform: translateY(100%);
    }
    to {
      transform: translateY(0);
    }
  }

  .modal-header {
    position: sticky !important;
    top: 0 !important;
    background: var(--bg-primary) !important;
    padding: 16px !important;
    border-bottom: 1px solid var(--border) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    border-radius: 24px 24px 0 0 !important;
  }

  .modal-header::before {
    content: '' !important;
    position: absolute !important;
    top: 8px !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    width: 36px !important;
    height: 4px !important;
    background: var(--border) !important;
    border-radius: 2px !important;
  }

  .modal-body {
    padding: 16px !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .modal-footer {
    position: sticky !important;
    bottom: 0 !important;
    background: var(--bg-primary) !important;
    padding: 16px !important;
    padding-bottom: calc(16px + var(--iphone-safe-bottom)) !important;
    border-top: 1px solid var(--border) !important;
    display: flex !important;
    gap: 12px !important;
  }

  .modal-footer button {
    flex: 1 !important;
    height: 48px !important;
    border-radius: 12px !important;
    font-size: var(--mobile-text-base) !important;
    font-weight: 600 !important;
  }
}

/* ===== History/Sessions List Mobile ===== */
@media screen and (max-width: 430px) {
  .session-list {
    padding: 16px !important;
    padding-bottom: 32px !important;
  }

  .session-card {
    background: var(--bg-secondary) !important;
    border-radius: 16px !important;
    padding: 16px !important;
    margin-bottom: 12px !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05) !important;
    transition: transform 0.2s ease !important;
  }

  .session-card:active {
    transform: scale(0.98) !important;
  }

  .session-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: flex-start !important;
    margin-bottom: 12px !important;
  }

  .session-title {
    font-size: var(--mobile-text-base) !important;
    font-weight: 600 !important;
    color: var(--text-primary) !important;
    margin-bottom: 4px !important;
  }

  .session-date {
    font-size: var(--mobile-text-sm) !important;
    color: var(--text-secondary) !important;
  }

  .session-duration {
    font-size: var(--mobile-text-lg) !important;
    font-weight: 700 !important;
    color: var(--primary) !important;
  }

  .session-details {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
    margin-top: 12px !important;
    padding-top: 12px !important;
    border-top: 1px solid var(--border) !important;
  }

  .session-detail-item {
    display: flex !important;
    align-items: center !important;
    gap: 4px !important;
    font-size: var(--mobile-text-sm) !important;
    color: var(--text-secondary) !important;
  }

  .session-detail-item .icon {
    font-size: 14px !important;
    color: var(--primary) !important;
  }
}

/* ===== Goals Mobile ===== */
@media screen and (max-width: 430px) {
  .goals-container {
    padding: 16px !important;
    padding-bottom: 32px !important;
  }

  .goal-card {
    background: var(--bg-secondary) !important;
    border-radius: 16px !important;
    padding: 16px !important;
    margin-bottom: 12px !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05) !important;
  }

  .goal-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    margin-bottom: 12px !important;
  }

  .goal-title {
    font-size: var(--mobile-text-base) !important;
    font-weight: 600 !important;
    color: var(--text-primary) !important;
  }

  .goal-badge {
    padding: 4px 8px !important;
    border-radius: 6px !important;
    font-size: 10px !important;
    font-weight: 600 !important;
    text-transform: uppercase !important;
    letter-spacing: 0.5px !important;
  }

  .goal-badge.active {
    background: rgba(var(--primary-rgb), 0.1) !important;
    color: var(--primary) !important;
  }

  .goal-badge.completed {
    background: rgba(var(--success-rgb), 0.1) !important;
    color: var(--success) !important;
  }

  .goal-progress {
    margin: 12px 0 !important;
  }

  .goal-progress-bar {
    height: 8px !important;
    background: var(--border) !important;
    border-radius: 4px !important;
    overflow: hidden !important;
  }

  .goal-progress-fill {
    height: 100% !important;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark)) !important;
    border-radius: 4px !important;
    transition: width 0.3s ease !important;
  }

  .goal-progress-text {
    display: flex !important;
    justify-content: space-between !important;
    margin-top: 8px !important;
    font-size: var(--mobile-text-sm) !important;
  }

  .goal-current {
    color: var(--text-primary) !important;
    font-weight: 600 !important;
  }

  .goal-target {
    color: var(--text-secondary) !important;
  }

  .goal-actions {
    display: flex !important;
    gap: 8px !important;
    margin-top: 12px !important;
  }

  .goal-action-btn {
    flex: 1 !important;
    height: 36px !important;
    border-radius: 8px !important;
    font-size: var(--mobile-text-sm) !important;
    font-weight: 600 !important;
    border: 1px solid var(--border) !important;
    background: var(--bg-primary) !important;
    color: var(--text-primary) !important;
  }

  .goal-action-btn.primary {
    background: var(--primary) !important;
    color: white !important;
    border-color: var(--primary) !important;
  }
}

/* ===== Floating Action Button (FAB) ===== */
@media screen and (max-width: 430px) {
  .fab {
    position: fixed !important;
    bottom: calc(var(--mobile-nav-height) + var(--iphone-safe-bottom) + 16px) !important;
    right: 16px !important;
    width: 56px !important;
    height: 56px !important;
    border-radius: 28px !important;
    background: var(--primary) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 24px !important;
    z-index: 1000 !important;
    transition: transform 0.2s ease !important;
  }

  .fab:active {
    transform: scale(0.9) !important;
  }

  .fab.extended {
    width: auto !important;
    padding: 0 20px !important;
    font-size: var(--mobile-text-base) !important;
    font-weight: 600 !important;
  }
}

/* ===== Swipe Gestures Support ===== */
@media screen and (max-width: 430px) {
  .swipeable {
    position: relative !important;
    overflow: hidden !important;
  }

  .swipe-actions {
    position: absolute !important;
    top: 0 !important;
    right: -100px !important;
    bottom: 0 !important;
    width: 100px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    background: var(--danger) !important;
    color: white !important;
    transition: transform 0.3s ease !important;
  }

  .swipeable.swiped .swipe-actions {
    transform: translateX(-100px) !important;
  }

  .swipeable-content {
    position: relative !important;
    z-index: 1 !important;
    background: var(--bg-primary) !important;
    transition: transform 0.3s ease !important;
  }

  .swipeable.swiped .swipeable-content {
    transform: translateX(-100px) !important;
  }
}

/* ===== Loading & Skeleton Screens ===== */
@media screen and (max-width: 430px) {
  .skeleton-card {
    background: var(--bg-secondary) !important;
    border-radius: 16px !important;
    padding: 16px !important;
    margin-bottom: 12px !important;
  }

  .skeleton-line {
    height: 12px !important;
    background: linear-gradient(
      90deg,
      var(--border) 25%,
      rgba(255, 255, 255, 0.1) 50%,
      var(--border) 75%
    ) !important;
    background-size: 200% 100% !important;
    animation: shimmer 1.5s infinite !important;
    border-radius: 6px !important;
    margin-bottom: 8px !important;
  }

  .skeleton-line.title {
    height: 16px !important;
    width: 60% !important;
  }

  .skeleton-line.subtitle {
    height: 12px !important;
    width: 40% !important;
  }

  @keyframes shimmer {
    0% {
      background-position: 200% 0;
    }
    100% {
      background-position: -200% 0;
    }
  }
}

/* ===== Haptic Feedback Visual Cues ===== */
@media screen and (max-width: 430px) {
  .haptic-light {
    animation: haptic-light 0.1s ease !important;
  }

  .haptic-medium {
    animation: haptic-medium 0.15s ease !important;
  }

  .haptic-heavy {
    animation: haptic-heavy 0.2s ease !important;
  }

  @keyframes haptic-light {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.98); }
  }

  @keyframes haptic-medium {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.96); }
  }

  @keyframes haptic-heavy {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.94); }
  }
}

/* ===== iOS Keyboard Handling ===== */
@media screen and (max-width: 430px) {
  .keyboard-open .main-content {
    padding-bottom: 0 !important;
  }

  .keyboard-open .top-navigation {
    display: none !important;
  }

  .keyboard-open .modal-content {
    max-height: calc(100vh - 300px) !important;
  }
}

/* ===== Performance Optimizations ===== */
@media screen and (max-width: 430px) {
  /* Use GPU acceleration for animations */
  .animated {
    will-change: transform;
    transform: translateZ(0);
  }

  /* Reduce motion for users who prefer it */
  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }

  /* Optimize scrolling performance */
  .scroll-container {
    -webkit-overflow-scrolling: touch;
    contain: strict;
  }

  /* Lazy load images */
  img[loading="lazy"] {
    background: var(--bg-secondary);
    min-height: 100px;
  }
}

/* ===== Dark Mode Optimizations ===== */
@media screen and (max-width: 430px) and (prefers-color-scheme: dark) {
  :root {
    --bg-primary-rgb: 0, 0, 0;
  }

  .app-header,
  .top-navigation {
    background: rgba(28, 28, 30, 0.95) !important;
  }

  .modal-content {
    background: rgb(28, 28, 30) !important;
  }

  .session-card,
  .goal-card,
  .skeleton-card {
    background: rgb(44, 44, 46) !important;
  }
}

/* ===== Accessibility Improvements ===== */
@media screen and (max-width: 430px) {
  /* Focus visible indicators */
  :focus-visible {
    outline: 3px solid var(--primary) !important;
    outline-offset: 2px !important;
  }

  /* Screen reader only content */
  .sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  /* High contrast mode support */
  @media (prefers-contrast: high) {
    .btn,
    .session-card,
    .goal-card {
      border: 2px solid currentColor !important;
    }
  }
}