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

:root {
  --apple-black: #1d1d1f;
  --apple-gray: #86868b;
  --apple-blue: #0071e3;
  --apple-white: #fbfbfd;
  --apple-text: #1d1d1f;
  --apple-text-secondary: #86868b;
  --pad-active: #4ade80;
  --pad-playing: #60a5fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --apple-black: #fbfbfd;
    --apple-gray: #86868b;
    --apple-blue: #0a84ff;
    --apple-white: #1d1d1f;
    --apple-text: #fbfbfd;
    --apple-text-secondary: #86868b;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: var(--apple-white);
  color: var(--apple-text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

.header {
  text-align: center;
  margin-bottom: 40px;
  padding-top: 20px;
}

.header h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  color: var(--apple-text);
}

.subtitle {
  font-size: 18px;
  color: var(--apple-text-secondary);
}

/* Upload Section */
.upload-section {
  margin-bottom: 40px;
}

.upload-area {
  border: 2px dashed var(--apple-gray);
  border-radius: 18px;
  padding: 60px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.upload-area:hover {
  border-color: var(--apple-blue);
  background: rgba(255, 255, 255, 0.7);
  transform: translateY(-2px);
}

.upload-area.dragover {
  border-color: var(--apple-blue);
  background: rgba(0, 113, 227, 0.1);
}

.upload-content svg {
  color: var(--apple-blue);
  margin-bottom: 16px;
}

.upload-content h2 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--apple-text);
}

.upload-content p {
  color: var(--apple-text-secondary);
  margin-bottom: 4px;
}

.formats {
  font-size: 14px;
  opacity: 0.7;
  margin-top: 8px;
}

/* Audio Info */
.audio-info {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.label {
  font-weight: 600;
  color: var(--apple-text-secondary);
  font-size: 14px;
}

.value {
  color: var(--apple-text);
  font-size: 14px;
}

/* Waveform Section */
.waveform-section {
  margin-bottom: 40px;
}

.controls-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.btn-primary {
  background: var(--apple-blue);
  color: white;
}

.btn-primary:hover {
  background: #005bb5;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--apple-gray);
  color: white;
}

.btn-secondary:hover {
  background: #6b6b6f;
  transform: translateY(-1px);
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-group label {
  font-size: 14px;
  color: var(--apple-text-secondary);
}

.slider-group input[type="range"] {
  width: 120px;
  height: 4px;
  border-radius: 2px;
  background: var(--apple-gray);
  outline: none;
  -webkit-appearance: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--apple-blue);
  cursor: pointer;
}

.slider-group input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--apple-blue);
  cursor: pointer;
  border: none;
}

.slider-group span {
  font-size: 14px;
  color: var(--apple-text);
  min-width: 40px;
}

.waveform-container {
  position: relative;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
}

#waveformCanvas {
  width: 100%;
  height: 200px;
  cursor: crosshair;
  display: block;
}

.slice-markers {
  position: absolute;
  top: 20px;
  left: 20px;
  right: 20px;
  height: 200px;
  pointer-events: none;
}

.slice-marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--apple-blue);
  cursor: pointer;
  pointer-events: auto;
  transition: width 0.2s ease;
}

.slice-marker:hover {
  width: 4px;
  background: #ff3b30;
}

.slice-marker::before {
  content: '';
  position: absolute;
  top: -8px;
  left: -4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--apple-blue);
  border: 2px solid var(--apple-white);
}

/* Pads Section */
.pads-section {
  margin-bottom: 40px;
}

.pads-section h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}

.pads-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: center;
  margin-bottom: 30px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
}

.pads-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .pads-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}

.pad {
  aspect-ratio: 1;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.1s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.pad:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.pad.active {
  background: rgba(74, 222, 128, 0.3);
  border-color: var(--pad-active);
  transform: scale(0.95);
}

.pad.playing {
  background: rgba(96, 165, 250, 0.3);
  border-color: var(--pad-playing);
  animation: pulse 0.3s ease;
}

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

.pad-number {
  font-size: 12px;
  font-weight: 600;
  color: var(--apple-text-secondary);
  margin-bottom: 4px;
}

.pad-label {
  font-size: 10px;
  color: var(--apple-text-secondary);
  text-align: center;
  padding: 0 4px;
  word-break: break-word;
}

.pad.empty .pad-label {
  opacity: 0.5;
}

.keyboard-hint {
  text-align: center;
  margin-top: 20px;
  color: var(--apple-text-secondary);
  font-size: 14px;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay p {
  color: white;
  margin-top: 20px;
  font-size: 16px;
}

/* Header Actions */
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

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

.btn-icon {
  background: transparent;
  border: 1px solid var(--apple-gray);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s ease;
  color: var(--apple-text);
}

.btn-icon:hover {
  background: rgba(0, 113, 227, 0.1);
  border-color: var(--apple-blue);
}

/* Controls Groups */
.controls-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.checkbox-group {
  display: flex;
  gap: 16px;
  align-items: center;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  cursor: pointer;
}

.select-input {
  padding: 8px 12px;
  border: 1px solid var(--apple-gray);
  border-radius: 6px;
  background: var(--apple-white);
  color: var(--apple-text);
  font-size: 14px;
  cursor: pointer;
}

/* Waveform Enhancements */
.waveform-wrapper {
  position: relative;
}

.waveform-scroll-container {
  overflow-x: auto;
  overflow-y: hidden;
  position: relative;
}

.playhead {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #ff3b30;
  pointer-events: none;
  z-index: 10;
  display: none;
}

.time-display {
  position: absolute;
  top: -20px;
  left: 0;
  padding: 2px 6px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 11px;
  border-radius: 3px;
  pointer-events: none;
  display: none;
}

.grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  opacity: 0.2;
  display: none;
}

.grid-overlay.show {
  display: block;
}

.slice-marker {
  position: relative;
}

.slice-marker::after {
  content: attr(data-index);
  position: absolute;
  top: -18px;
  left: -8px;
  font-size: 10px;
  color: var(--apple-blue);
  font-weight: 600;
  background: var(--apple-white);
  padding: 2px 4px;
  border-radius: 3px;
  display: none;
}

.slice-marker:hover::after {
  display: block;
}

/* Minimap */
.waveform-minimap {
  height: 60px;
  position: relative;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 6px;
  margin-top: 8px;
  cursor: pointer;
}

#minimapCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.minimap-viewport {
  position: absolute;
  top: 0;
  bottom: 0;
  background: rgba(0, 113, 227, 0.3);
  border: 1px solid var(--apple-blue);
  pointer-events: none;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.toast {
  background: var(--apple-white);
  border: 1px solid var(--apple-gray);
  border-radius: 8px;
  padding: 12px 16px;
  min-width: 250px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 12px;
  opacity: 0;
  transform: translateX(100%);
  transition: all 0.3s ease;
  pointer-events: auto;
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

.toast-icon {
  font-size: 18px;
  font-weight: bold;
}

.toast-success {
  border-color: #4ade80;
  background: rgba(74, 222, 128, 0.1);
}

.toast-error {
  border-color: #ff3b30;
  background: rgba(255, 59, 48, 0.1);
}

.toast-warning {
  border-color: #ff9500;
  background: rgba(255, 149, 0, 0.1);
}

.toast-info {
  border-color: var(--apple-blue);
  background: rgba(0, 113, 227, 0.1);
}

/* Progress Bars */
.progress-bar-container {
  width: 100%;
  max-width: 400px;
  margin: 20px 0;
}

.progress-label {
  font-size: 14px;
  color: white;
  margin-bottom: 8px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--apple-blue);
  transition: width 0.3s ease;
  width: 0%;
}

.progress-percent {
  font-size: 12px;
  color: white;
  margin-top: 4px;
  text-align: right;
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-content {
  background: var(--apple-white);
  border-radius: 12px;
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--apple-gray);
}

.modal-header h3 {
  margin: 0;
  font-size: 24px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--apple-text-secondary);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--apple-text);
}

.modal-body {
  padding: 20px;
  flex: 1;
  overflow-y: auto;
}

.modal-footer {
  padding: 20px;
  border-top: 1px solid var(--apple-gray);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* Settings Tabs */
.settings-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--apple-gray);
  margin-bottom: 20px;
}

.tab-btn {
  padding: 12px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 14px;
  color: var(--apple-text-secondary);
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--apple-text);
}

.tab-btn.active {
  color: var(--apple-blue);
  border-bottom-color: var(--apple-blue);
}

.tab-content {
  display: none;
}

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

.setting-item {
  margin-bottom: 20px;
}

.setting-item label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--apple-text);
}

.setting-item select,
.setting-item input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--apple-gray);
  border-radius: 6px;
  font-size: 14px;
}

/* Pad Settings */
.pad-settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--apple-text);
}

.setting-group input[type="range"] {
  width: 100%;
}

.setting-group span {
  font-size: 12px;
  color: var(--apple-text-secondary);
}

/* Section Header */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-actions {
  display: flex;
  gap: 8px;
}

/* Search Input */
.search-input {
  padding: 8px 12px;
  border: 1px solid var(--apple-gray);
  border-radius: 6px;
  font-size: 14px;
  width: 200px;
}

/* Spectrum Analyzer */
.spectrum-analyzer {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 300px;
  height: 150px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
}

#spectrumCanvas {
  width: 100%;
  height: 100%;
}

/* Project Actions */
.project-actions {
  position: fixed;
  bottom: 20px;
  left: 20px;
  display: flex;
  gap: 8px;
  z-index: 1000;
}

/* Tutorial System */
.tutorial-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20000;
  pointer-events: none;
}

.tutorial-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.tutorial-card {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--apple-white);
  border-radius: 12px;
  padding: 24px;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  z-index: 20001;
  pointer-events: auto;
}

.tutorial-card h3 {
  margin: 0 0 12px 0;
  font-size: 20px;
  color: var(--apple-text);
}

.tutorial-card p {
  margin: 0 0 20px 0;
  color: var(--apple-text-secondary);
  line-height: 1.6;
}

.tutorial-buttons {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.tutorial-target {
  position: relative;
  z-index: 20002;
}

/* Responsive */
@media (max-width: 768px) {
  .pads-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .controls-group {
    flex-direction: column;
    align-items: stretch;
  }

  .slider-group {
    width: 100%;
  }

  .slider-group input[type="range"] {
    flex: 1;
  }

  .modal-content {
    max-width: 100%;
    margin: 10px;
  }

  .pad-settings-grid {
    grid-template-columns: 1fr;
  }

  .header-top {
    flex-direction: column;
    gap: 12px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .project-actions {
    flex-direction: column;
    width: calc(100% - 40px);
  }
}