/* ==========================================================================
   Audio Merger Scoped Stylesheet
   Reverse-Engineered to match Submind and AllToolsNow design tokens
   Scoped under .merger-app
   ========================================================================== */

.merger-app {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1rem 3rem 1rem;
}

/* Hero Section */
.merger-hero {
  text-align: center;
  margin-bottom: 2rem;
  padding-top: 1rem;
}

.merger-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent-light, #EDE9FE);
  color: var(--accent, #7C3AED);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill, 9999px);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.merger-hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--text-primary, #0F172A);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.merger-hero p {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary, #475569);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Main Container Card */
.merger-card {
  background: var(--bg-surface, #FFFFFF);
  border: 1px solid var(--border, #E2E8F0);
  border-radius: var(--radius-2xl, 24px);
  box-shadow: var(--shadow-card, 0 4px 20px -2px rgba(15, 23, 42, 0.05));
  padding: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
}

/* Error Banner */
.merger-error {
  display: none;
  background-color: var(--danger-light, #FEE2E2);
  border: 1px solid var(--danger, #EF4444);
  color: var(--danger-text, #991B1B);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md, 10px);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
  align-items: center;
  justify-content: space-between;
}

.merger-error-btn {
  background: none;
  border: none;
  color: var(--danger-text, #991B1B);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  padding: 0.25rem 0.5rem;
}

/* 1. Intake Multi-File Dropzone */
.merger-dropzone {
  border: 2px dashed #93C5FD;
  background-color: #F8FAFC;
  border-radius: 20px;
  padding: 3.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.merger-dropzone:hover,
.merger-dropzone.dragover {
  border-color: #3B82F6;
  background-color: #EFF6FF;
  transform: translateY(-2px);
}

.merger-drop-icon {
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
}

.merger-drop-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.5rem;
}

.merger-drop-sub {
  font-size: 0.9375rem;
  color: var(--text-secondary, #475569);
  margin-bottom: 1rem;
}

.merger-formats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.merger-format-tag {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-surface-secondary, #F1F5F9);
  color: var(--text-secondary, #475569);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm, 6px);
}

.merger-privacy-pill {
  font-size: 0.8125rem;
  color: #475569;
  background: #EEF2F6;
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* 2. Loading State */
.merger-loading {
  text-align: center;
  padding: 3rem 1rem;
  display: none;
}

.merger-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--accent-light, #EDE9FE);
  border-top-color: var(--accent, #7C3AED);
  border-radius: 50%;
  animation: mergerSpin 0.8s linear infinite;
  margin: 0 auto 1.25rem auto;
}

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

.merger-loading-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.5rem;
}

.merger-loading-sub {
  font-size: 0.875rem;
  color: var(--text-secondary, #475569);
}

/* 3. Active Workspace (Submind Card Structure) */
.merger-workspace {
  display: none;
}

.merger-submind-card {
  background: #F3F4F6;
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 16px;
  border: 1px solid #E5E7EB;
}

.merger-workspace-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 0.75rem;
}

.merger-workspace-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #374151;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.merger-summary-pills {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.merger-pill-badge {
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  background: #FFFFFF;
  border: 1px solid #D1D5DB;
  color: #111827;
}

.merger-pill-badge.accent {
  background: #000000;
  color: #FFFFFF;
  border-color: #000000;
}

/* Track List Container */
.merger-track-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

/* Individual Track Card */
.merger-track-item {
  background: #FFFFFF;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: all 0.15s ease;
  user-select: none;
}

.merger-track-item:hover {
  border-color: #93C5FD;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.merger-track-item.dragging {
  opacity: 0.4;
  border-style: dashed;
  border-color: #3B82F6;
}

.merger-track-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.merger-drag-handle {
  cursor: grab;
  color: #9CA3AF;
  font-size: 1.25rem;
  line-height: 1;
  padding: 4px;
  touch-action: none;
}

.merger-drag-handle:hover {
  color: #111827;
}

.merger-track-index {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #F3F4F6;
  color: #4B5563;
  font-size: 0.8125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.merger-track-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.merger-track-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #111827;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 380px;
}

.merger-track-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: #6B7280;
  margin-top: 2px;
}

.merger-track-duration {
  font-weight: 600;
  color: #374151;
}

/* Solo Audition Mini Player */
.btn-track-play {
  background: #F3F4F6;
  border: 1px solid #E5E7EB;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #111827;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.btn-track-play:hover {
  background: #000000;
  color: #FFFFFF;
  border-color: #000000;
}

.btn-track-play.playing {
  background: #7C3AED;
  color: #FFFFFF;
  border-color: #7C3AED;
}

/* Track Controls: Move Up, Move Down, Delete */
.merger-track-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.btn-track-action {
  background: #F9FAFB;
  border: 1px solid #E5E7EB;
  border-radius: 8px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4B5563;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 0.875rem;
}

.btn-track-action:hover:not(:disabled) {
  background: #F3F4F6;
  color: #111827;
  border-color: #D1D5DB;
}

.btn-track-action:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-track-action.danger:hover {
  background: #FEE2E2;
  color: #EF4444;
  border-color: #FCA5A5;
}

/* Add More Audio Files Button */
.merger-add-more-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-add-more-files {
  background: #FFFFFF;
  border: 1px solid #D1D5DB;
  border-radius: 9999px;
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 700;
  color: #111827;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-add-more-files:hover {
  background: #F3F4F6;
  border-color: #9CA3AF;
}

.btn-clear-all-tracks {
  background: none;
  border: none;
  color: #6B7280;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

.btn-clear-all-tracks:hover {
  color: #EF4444;
}

/* Crossfade & Transition Controls Card */
.merger-transition-card {
  margin-top: 16px;
  background: #F3F4F6;
  border-radius: 16px;
  padding: 16px 20px;
  border: 1px solid #E5E7EB;
}

.merger-transition-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.merger-transition-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: #374151;
}

.merger-transition-desc {
  font-size: 0.75rem;
  color: #6B7280;
  display: block;
}

.merger-transition-options {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-xfade-opt {
  background: #FFFFFF;
  border: 1px solid #D1D5DB;
  border-radius: 9999px;
  padding: 6px 12px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #374151;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-xfade-opt.active {
  background: #000000;
  color: #FFFFFF;
  border-color: #000000;
}

/* Primary Action CTA Button: Save / Merge */
.btn-submind-merge {
  width: 100%;
  background: #000000;
  color: #FFFFFF;
  padding: 18px 24px;
  border-radius: 9999px;
  border: none;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: background 0.15s ease, transform 0.1s ease;
  margin-top: 16px;
  margin-bottom: 8px;
  display: block;
}

.btn-submind-merge:hover:not(:disabled) {
  background: #1F2937;
}

.btn-submind-merge:active:not(:disabled) {
  transform: scale(0.99);
}

.btn-submind-merge:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.merger-tip-text {
  font-size: 0.8125rem;
  color: #6B7280;
  text-align: center;
  margin: 0;
  line-height: 1.5;
}

/* 4. Multi-Stage Progress Container */
.merger-progress-container {
  display: none;
  text-align: center;
  padding: 3rem 1.5rem;
}

.merger-progress-track {
  width: 100%;
  max-width: 480px;
  height: 8px;
  background: #E5E7EB;
  border-radius: 9999px;
  margin: 1.5rem auto 1rem auto;
  overflow: hidden;
}

.merger-progress-fill {
  height: 100%;
  width: 0%;
  background: #000000;
  border-radius: 9999px;
  transition: width 0.2s ease;
}

.merger-progress-stage {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #111827;
}

/* 5. Results & Instant Download View */
.merger-results {
  display: none;
}

.merger-success-header {
  text-align: center;
  margin-bottom: 2rem;
}

.merger-check-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--success-light, #D1FAE5);
  color: var(--success, #10B981);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem auto;
}

.merger-success-header h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #0F172A;
  margin-bottom: 0.5rem;
}

.merger-success-header p {
  color: #475569;
  font-size: 0.9375rem;
  max-width: 560px;
  margin: 0 auto;
}

/* Merged Output Audio Player Card */
.merger-output-player-card {
  background: #F3F4F6;
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 24px;
  border: 1px solid #E5E7EB;
}

.merger-output-player-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.merger-output-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: #6B7280;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.merger-output-time {
  font-size: 0.95rem;
  font-weight: 700;
  color: #111827;
}

.merger-output-audio {
  width: 100%;
  height: 44px;
  outline: none;
  border-radius: 9999px;
}

/* Dual Instant Download Cards (User Preferred 2-Column Grid) */
.merger-downloads-section-title {
  font-size: 1rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 1rem;
}

.merger-downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.merger-download-card {
  border: 1px solid #E2E8F0;
  border-radius: 16px;
  padding: 1.5rem;
  background: #FFFFFF;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  position: relative;
  transition: all 0.2s ease;
}

.merger-download-card:hover {
  border-color: #7C3AED;
  box-shadow: 0 8px 20px -4px rgba(124, 58, 237, 0.15);
  transform: translateY(-2px);
}

.merger-download-card.card-recommended {
  border-color: #7C3AED;
  background: linear-gradient(180deg, #FAF5FF 0%, #FFFFFF 100%);
}

.merger-badge-rec {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #7C3AED;
  color: #FFFFFF;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
}

.merger-badge-lossless {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #0F172A;
  color: #FFFFFF;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
}

.merger-dl-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: #0F172A;
  margin-bottom: 0.35rem;
}

.merger-dl-desc {
  font-size: 0.8125rem;
  color: #475569;
  line-height: 1.5;
}

.btn-download-trigger {
  width: 100%;
  padding: 0.85rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: 9999px;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.15s ease;
}

.btn-download-primary {
  background: #7C3AED;
  color: #FFFFFF;
}

.btn-download-primary:hover {
  background: #6D28D9;
}

.btn-download-trigger.encoding {
  background: #64748B;
  color: #F8FAFC;
  cursor: wait;
  opacity: 0.95;
}

.btn-download-trigger.encoding:hover {
  background: #475569;
}

.merger-btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: mergerSpin 0.8s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

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

.btn-download-secondary {
  background: #0F172A;
  color: #FFFFFF;
}

.btn-download-secondary:hover {
  background: #1E293B;
}

/* Stats Metric Grid */
.merger-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.merger-stat-card {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}

.merger-stat-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #64748B;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.merger-stat-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: #0F172A;
  font-family: var(--font-sans);
}

.merger-stat-val.accent {
  color: #7C3AED;
}

/* Results Action Bar */
.merger-reset-bar {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: 1px solid #E2E8F0;
}

.btn-text-action {
  background: none;
  border: none;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.15s ease;
}

.btn-text-action:hover {
  color: #7C3AED;
}

/* Next Steps Recommendation Grid */
.merger-next-tools {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid #E2E8F0;
}

.merger-next-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: #64748B;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.merger-next-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

.merger-next-card {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: #0F172A;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.15s ease;
}

.merger-next-card:hover {
  border-color: #7C3AED;
  background: #FFFFFF;
  transform: translateY(-1px);
}

.merger-next-icon {
  font-size: 1.25rem;
}

.merger-next-name {
  font-size: 0.875rem;
  font-weight: 700;
}

.merger-next-desc {
  font-size: 0.75rem;
  color: #64748B;
}

/* Mobile & Touch Responsiveness */
@media (max-width: 768px) {
  .merger-card {
    padding: 1.25rem;
    border-radius: 16px;
  }

  .merger-submind-card {
    padding: 16px 14px;
  }

  .merger-track-name {
    max-width: 180px;
  }

  .merger-downloads-grid {
    grid-template-columns: 1fr;
  }

  .merger-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn-submind-merge {
    min-height: 52px;
  }
}