/* SetSync App — dark theme extending the landing page CSS */

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App Header */
.app-header {
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
}
.app-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.app-header-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
}
.app-header-sep {
  width: 1px;
  height: 16px;
  background: var(--border);
}
.app-header-section {
  font-size: 14px;
  color: var(--text-2);
  font-weight: 500;
}
.app-nav-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 24px;
}
.app-tab {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
  border: none;
  background: none;
  transition: background 0.15s, color 0.15s;
}
.app-tab:hover { background: var(--bg-2); color: var(--text); }
.app-tab.active {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
}

/* App Body */
.app-body {
  flex: 1;
  padding: 48px 40px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Import Section */
.import-zone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 64px 40px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 40px;
}
.import-zone:hover, .import-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.import-zone-icon {
  font-size: 48px;
  margin-bottom: 16px;
}
.import-zone-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.import-zone-sub {
  font-size: 15px;
  color: var(--text-2);
}
.import-zone-sub strong { color: var(--accent); }
.import-input { display: none; }

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
}
.stat-card-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -1px;
  display: block;
}
.stat-card-label {
  font-size: 13px;
  color: var(--text-2);
  margin-top: 4px;
  display: block;
}

/* Section Headers */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
}
.section-badge {
  padding: 4px 12px;
  background: var(--accent-dim);
  border: 1px solid rgba(255,107,44,0.2);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}

/* Track List */
.track-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 48px;
}
.track-row {
  display: grid;
  grid-template-columns: 40px 1fr 80px 100px 80px 60px;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
}
.track-row:hover { border-color: rgba(255,107,44,0.3); }
.track-rank {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-3);
  text-align: center;
}
.track-row.top .track-rank { color: var(--accent); font-size: 16px; }
.track-info { min-width: 0; }
.track-name {
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.track-artist {
  font-size: 12px;
  color: var(--text-2);
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.track-bpm {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  text-align: right;
}
.track-key {
  font-size: 13px;
  color: var(--text-2);
  text-align: center;
  padding: 3px 8px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.track-plays {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  text-align: right;
}
.track-score {
  font-size: 13px;
  color: var(--text-3);
  text-align: right;
}
.score-bar-wrap {
  width: 60px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-left: auto;
}
.score-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* New/Unplayed Badge */
.new-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: #4ade80;
  text-transform: uppercase;
  padding: 4px 10px;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.25);
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.new-badge:hover { background: rgba(74, 222, 128, 0.2); }
.new-badge.kept { color: var(--text-2); background: var(--bg-2); border-color: var(--border); }

/* Taste Profile */
.taste-profile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 48px;
}
.taste-profile-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 24px;
}
.taste-dimensions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.taste-dim {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.taste-dim-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-3);
}
.taste-dim-val {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
}
.taste-dim-sub {
  font-size: 12px;
  color: var(--text-2);
}

/* Genre Breakdown */
.genre-breakdown {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.genre-chip {
  padding: 5px 14px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-2);
}
.genre-chip.primary {
  background: var(--accent-dim);
  border-color: rgba(255,107,44,0.3);
  color: var(--accent);
  font-weight: 600;
}

/* Action Bar */
.action-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 16px 40px;
  z-index: 60;
  display: none;
  align-items: center;
  gap: 16px;
}
.action-bar.visible { display: flex; }
.action-bar-info {
  flex: 1;
  font-size: 14px;
  color: var(--text-2);
}
.action-bar-info strong { color: var(--white); }
.action-count {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  margin-right: 4px;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--accent);
  color: var(--white);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
  text-decoration: none;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  text-decoration: none;
}
.btn-ghost:hover { border-color: var(--text-3); color: var(--text); }
.btn-ghost.red:hover { border-color: rgba(239,68,68,0.4); color: #ef4444; }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 40px;
}
.empty-icon { font-size: 64px; margin-bottom: 20px; }
.empty-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}
.empty-sub { font-size: 15px; color: var(--text-2); max-width: 400px; margin: 0 auto 32px; }

/* Simulate History Button */
.simulate-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  margin-bottom: 32px;
}
.simulate-btn:hover { border-color: var(--accent); color: var(--accent); }
.simulate-btn.running { color: var(--accent); border-color: rgba(255,107,44,0.3); }

/* Page visibility */
.page { display: none; }
.page.active { display: block; }

/* Responsive */
@media (max-width: 768px) {
  .app-header { padding: 0 24px; }
  .app-body { padding: 32px 24px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .taste-dimensions { grid-template-columns: repeat(2, 1fr); }
  .track-row {
    grid-template-columns: 32px 1fr 60px 60px;
    gap: 10px;
  }
  .track-plays, .track-score { display: none; }
  .action-bar { padding: 16px 24px; }
}