/* CSS Variables for Light/Dark Mode */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --nav-bg: #ffffff;
  --nav-border: #e2e8f0;
}

.dark-mode {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --border-color: #334155;
  --card-bg: #1e293b;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.5);
  --nav-bg: #1e293b;
  --nav-border: #334155;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: -webkit-fill-available;
  overflow: hidden;
  transition: background-color 0.3s, color 0.3s;
}

html {
  height: -webkit-fill-available;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

header h1 {
  font-size: 1.2rem;
  font-weight: 700;
}

.header-right {
  display: flex;
  gap: 8px;
}

.btn-icon {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: background-color 0.2s;
}

.btn-icon:hover {
  background-color: var(--bg-tertiary);
}

/* Main Content Area */
main {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  padding-bottom: 80px; /* Space for bottom nav */
}

.tab-content {
  display: none;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}

.tab-content.active {
  display: flex;
}

/* Buttons */
.btn {
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background-color: var(--accent);
  color: #000;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-small {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-large {
  padding: 14px 24px;
  font-size: 1.1rem;
  width: 100%;
}

/* Selector & Badges */
.selector-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.selector-container label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
}

select, input[type="text"] {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
}

.progression-info {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.badge {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.rhythm-box {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
}

/* Chords Display Grid */
.chords-display-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  background-color: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 8px;
  overflow-x: auto;
}

.chords-grid {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.chord-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 75px;
  max-width: 90px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.1s;
}

.chord-card:active {
  transform: scale(0.95);
}

.chord-card.playing {
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.chord-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.chord-svg {
  width: 60px;
  height: 75px;
}

.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Tuner Styles */
.tuner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  height: 100%;
  justify-content: space-around;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.tuner-visual {
  position: relative;
  width: 200px;
  height: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
}

.tuner-gauge {
  position: absolute;
  top: 0;
  width: 100%;
  height: 80px;
  border: 2px solid var(--border-color);
  border-bottom: none;
  border-radius: 100px 100px 0 0;
  overflow: hidden;
}

.tuner-needle {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 3px;
  height: 70px;
  background-color: var(--accent);
  transform-origin: bottom center;
  transform: translateX(-50%) rotate(0deg);
  transition: transform 0.1s ease-out;
}

.tuner-center-mark {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 6px;
  height: 12px;
  background-color: #10b981;
  transform: translateX(-50%);
}

.detected-note {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  margin-top: 10px;
}

.detune-amount {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.reference-notes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  width: 100%;
  max-width: 320px;
}

.ref-note-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px 0;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.ref-note-btn.playing {
  background-color: var(--accent);
  color: #000;
  border-color: var(--accent);
}

/* Metronome Styles */
.metronome-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  justify-content: space-around;
  height: 100%;
}

.metro-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.metro-visual-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--border-color);
  transition: background-color 0.05s;
}

.metro-visual-dot.flash {
  background-color: var(--accent);
  transform: scale(1.2);
}

.metro-visual-dot.flash-accent {
  background-color: #10b981;
  transform: scale(1.3);
}

.bpm-display {
  font-size: 3rem;
  font-weight: 800;
}

.bpm-unit {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.metro-controls {
  width: 100%;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.bpm-buttons {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.bpm-buttons button {
  flex: 1;
}

.time-signature-container {
  display: flex;
  gap: 8px;
}

.sig-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.sig-btn.active {
  background-color: var(--accent);
  color: #000;
  border-color: var(--accent);
}

/* Library Styles */
.library-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}

.search-box {
  position: sticky;
  top: 0;
  z-index: 5;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
  gap: 8px;
  overflow-y: auto;
  padding-bottom: 20px;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: var(--nav-bg);
  border-top: 1px solid var(--nav-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  flex: 1;
  height: 100%;
  gap: 4px;
}

.nav-item.active {
  color: var(--accent);
}

.nav-icon {
  font-size: 1.2rem;
}

.nav-label {
  font-size: 0.7rem;
  font-weight: 600;
}

/* Responsive adjustments */
@media (max-height: 600px) {
  header {
    padding: 6px 12px;
  }
  header h1 {
    font-size: 1rem;
  }
  .bottom-nav {
    height: 50px;
  }
  .nav-icon {
    font-size: 1rem;
  }
  .nav-label {
    font-size: 0.6rem;
  }
  .chords-display-container {
    min-height: 130px;
  }
  .chord-card {
    min-width: 60px;
    padding: 4px;
  }
  .chord-svg {
    width: 45px;
    height: 55px;
  }
  .tuner-visual {
    height: 80px;
  }
  .tuner-gauge {
    height: 60px;
  }
  .detected-note {
    font-size: 1.8rem;
  }
  .bpm-display {
    font-size: 2rem;
  }
}