/* ─── Track Slot Container ───────────────────────────────────── */
.tracks-section { margin-bottom: 16px; }

.tracks-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.tracks-grid--single {
  grid-template-columns: 1fr;
  max-width: 600px;
  margin: 0 auto;
}
@media (max-width: 680px) {
  .tracks-grid { grid-template-columns: 1fr; }
}

.track-slot {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s;
}

/* ─── Drop Zone ──────────────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 20px 28px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.18s, background 0.18s;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 0;
}
.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(108, 99, 255, 0.04);
}
.dz-upload-mode,
.dz-youtube-mode {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}
.dropzone-content { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.upload-icon { margin-bottom: 4px; opacity: 0.6; }
.dropzone-hint {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}
.dropzone-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.browse-btn {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.browse-btn:hover { color: var(--accent-hover); }
.dropzone-formats {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 4px;
  letter-spacing: 0.03em;
}
.dropzone-error {
  font-size: 0.78rem;
  color: var(--danger);
  margin-top: 6px;
  font-weight: 500;
}

/* ─── Mode Tabs (Upload / YouTube) ──────────────────────────── */
.dz-mode-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}
.dz-mode-tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 99px;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.dz-mode-tab:hover { color: var(--text); border-color: var(--text-muted); }
.dz-mode-tab.active {
  color: var(--text);
  background: var(--surface);
  border-color: var(--accent);
}

/* ─── YouTube URL Input ──────────────────────────────────────── */
.yt-url-row {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 360px;
  margin-top: 8px;
}
.yt-url-input {
  flex: 1;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.8rem;
  padding: 7px 10px;
  transition: border-color 0.15s;
  min-width: 0;
}
.yt-url-input:focus { outline: none; border-color: var(--accent); }
.yt-url-input::placeholder { color: var(--text-dim); }
.yt-use-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  white-space: nowrap;
  transition: background 0.15s;
  flex-shrink: 0;
}
.yt-use-btn:hover:not(:disabled) { background: var(--accent-hover); }
.yt-use-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── YouTube Ready State ────────────────────────────────────── */
.yt-ready {
  display: none;           /* hidden by default; .is-youtube shows it */
  align-items: center;
  gap: 10px;
  padding: 14px 0 4px;
}
.track-ready.is-youtube .yt-ready { display: flex; }
.track-ready.is-youtube .waveform-container,
.track-ready.is-youtube .waveform-controls,
.track-ready.is-youtube .basic-analysis { display: none; }
.yt-ready-url {
  flex: 1;
  font-size: 0.82rem;
  color: var(--accent-ref);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-decoration: none;
}
.yt-ready-url:hover { text-decoration: underline; }

/* ─── Upload Spinner State ───────────────────────────────────── */
.upload-spinner {
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.spinner-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
}
.spinner-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  max-width: 240px;
  text-align: center;
  line-height: 1.5;
}
.spinner-retry-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(108, 99, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(108, 99, 255, 0.22);
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.spinner-retry-btn:hover {
  background: rgba(108, 99, 255, 0.18);
  border-color: rgba(108, 99, 255, 0.34);
  color: var(--accent-hover);
}