.alpf-main-card {
  background: var(--bg-surface, #fff);
  color: var(--text-base, #0f172a);
  border: 1px solid var(--border-base, #e2e8f0);
  border-radius: 1.25rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.theme-dark .alpf-main-card {
  background: var(--bg-surface, #0f172a);
  color: var(--text-base, #f8fafc);
  border-color: var(--border-base, #1e293b);
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.4);
}

.alpf-dropzone {
  border: 2px dashed var(--border-base, #cbd5e1);
  border-radius: 1rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  background: rgba(241, 245, 249, 0.4);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.theme-dark .alpf-dropzone {
  border-color: var(--border-base, #334155);
  background: rgba(30, 41, 59, 0.3);
}

.alpf-dropzone:hover,
.alpf-dropzone.drag-over {
  border-color: var(--accent-base, #6366f1);
  background: rgba(99, 102, 241, 0.06);
  transform: translateY(-2px);
}

.alpf-dropzone-icon {
  width: 3rem;
  height: 3rem;
  color: var(--accent-base, #6366f1);
}

.alpf-dropzone-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.alpf-dropzone-subtitle {
  font-size: 0.875rem;
  opacity: 0.7;
}

.alpf-file-input {
  display: none;
}

.alpf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 0.625rem;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.alpf-btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: var(--text-inverse, #fff);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.alpf-btn-primary:hover {
  background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.alpf-btn-primary:active {
  transform: translateY(0);
}

.alpf-btn-secondary {
  background: var(--bg-muted, #f1f5f9);
  color: var(--text-base, #334155);
  border: 1px solid var(--border-base, #cbd5e1);
}

.theme-dark .alpf-btn-secondary {
  background: var(--bg-muted, #1e293b);
  color: var(--text-base, #e2e8f0);
  border-color: var(--border-base, #334155);
}

.alpf-btn-secondary:hover {
  border-color: var(--accent-base, #6366f1);
  color: var(--accent-base, #6366f1);
}

.alpf-btn-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: var(--text-inverse, #fff);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.alpf-btn-success:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.alpf-workspace {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.alpf-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
}

.alpf-stat-card {
  background: var(--bg-muted, #f8fafc);
  border: 1px solid var(--border-base, #e2e8f0);
  border-radius: 0.75rem;
  padding: 0.875rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.theme-dark .alpf-stat-card {
  background: var(--bg-muted, #1e293b);
  border-color: var(--border-base, #334155);
}

.alpf-stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

.alpf-stat-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-base, #6366f1);
}

.theme-dark .alpf-stat-value {
  color: var(--accent-light, #818cf8);
}

.alpf-waveform-container {
  position: relative;
  background: #020617;
  border-radius: 0.875rem;
  border: 1px solid var(--border-base, #334155);
  padding: 0.5rem;
  overflow: hidden;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.5);
}

.alpf-waveform-canvas {
  width: 100%;
  height: 180px;
  display: block;
  cursor: crosshair;
}

.alpf-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem;
  background: var(--bg-muted, #f8fafc);
  border: 1px solid var(--border-base, #e2e8f0);
  border-radius: 0.75rem;
}

.theme-dark .alpf-toolbar {
  background: var(--bg-muted, #1e293b);
  border-color: var(--border-base, #334155);
}

.alpf-controls-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.alpf-marker-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.alpf-input-field {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.alpf-label {
  font-size: 0.875rem;
  font-weight: 600;
}

.alpf-input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.alpf-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-base, #cbd5e1);
  background: var(--bg-surface, #fff);
  color: var(--text-base, #0f172a);
  font-size: 0.9375rem;
}

.theme-dark .alpf-input {
  border-color: var(--border-base, #334155);
  background: var(--bg-surface, #0f172a);
  color: var(--text-base, #f8fafc);
}

.alpf-input:focus {
  outline: none;
  border-color: var(--accent-base, #6366f1);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.alpf-preset-chips {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.alpf-chip {
  padding: 0.375rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--border-base, #cbd5e1);
  background: var(--bg-surface, #fff);
  color: var(--text-base, #475569);
  cursor: pointer;
  transition: all 0.15s ease;
}

.theme-dark .alpf-chip {
  border-color: var(--border-base, #334155);
  background: var(--bg-surface, #1e293b);
  color: var(--text-base, #94a3b8);
}

.alpf-chip:hover {
  border-color: var(--accent-base, #6366f1);
  color: var(--accent-base, #6366f1);
  transform: translateY(-1px);
}

.alpf-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  background: var(--bg-muted, #f1f5f9);
}

.theme-dark .alpf-status-bar {
  background: var(--bg-muted, #1e293b);
}

.alpf-particle {
  position: absolute;
  pointer-events: none;
  font-weight: bold;
  font-size: 0.875rem;
  color: var(--accent-base, #6366f1);
  animation: alpf-particle-float 0.8s ease-out forwards;
}

@keyframes alpf-particle-float {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(0, -30px) scale(1.3);
  }
}