:root {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-soft: #141b2f;
  --panel: #111a2b;
  --text: #e6edff;
  --muted: #8ea0c9;
  --accent: #6b8dff;
  --accent-2: #8f6bff;
  --border: rgba(255, 255, 255, 0.12);
  --ok: #5ad6a0;
  --danger: #ff6b7a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at top right, #1a2040 0%, var(--bg) 60%);
  color: var(--text);
}

.app-header {
  padding: 1.5rem 1rem 1rem;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.subtitle {
  margin: 0.4rem auto 0;
  max-width: 800px;
  color: var(--muted);
}

.layout {
  width: 95vw;
  max-width: 1600px;
  margin: 0 auto 2rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(12, 1fr);
}

.panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  backdrop-filter: blur(6px);
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 0.8rem;
  font-size: 1.05rem;
}

.upload-panel,
.lyrics-panel,
.actions-panel {
  grid-column: span 12;
}

.waveform-panel {
  grid-column: span 12;
  width: min(95vw, 1600px);
  justify-self: center;
}

@media (min-width: 900px) {
  .upload-panel,
  .lyrics-panel,
  .actions-panel {
    grid-column: span 4;
  }
}

.drop-zone {
  border: 1.5px dashed rgba(143, 107, 255, 0.65);
  border-radius: 12px;
  padding: 1.2rem;
  text-align: center;
  cursor: pointer;
  transition: 0.2s ease;
  background: rgba(20, 27, 47, 0.5);
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.drag-over {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 0 0 3px rgba(107, 141, 255, 0.2);
}

.drop-zone p {
  margin: 0;
}

.drop-zone small {
  color: var(--muted);
}

textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  padding: 0.8rem;
  resize: vertical;
  min-height: 170px;
}

.lyrics-mode-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 0.8rem;
}

.mode-tab {
  border: none;
  background: #16213b;
  color: var(--muted);
  padding: 0.55rem 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.mode-tab.active {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
}

.lyrics-view.hidden {
  display: none;
}

.chips-hint {
  margin: 0 0 0.55rem;
}

.word-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  max-height: 260px;
  overflow: auto;
  padding: 0.2rem;
}

.word-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(143, 107, 255, 0.5);
  background: rgba(143, 107, 255, 0.18);
  color: var(--text);
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  font-size: 0.92rem;
  cursor: grab;
  user-select: none;
}

.word-chip:active {
  cursor: grabbing;
}

.word-chip.placed {
  opacity: 0.4;
  text-decoration: line-through;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  cursor: not-allowed;
}

.actions-row {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--border);
  color: var(--text);
  background: #1a2542;
  padding: 0.65rem 0.95rem;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn:hover:enabled {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn.primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border: none;
}

.status {
  margin-top: 0.8rem;
  color: var(--muted);
  min-height: 1.4rem;
}

.status.error {
  color: var(--danger);
}

.status.ok {
  color: var(--ok);
}

.progress-wrap {
  margin-top: 0.8rem;
  padding: 0.65rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(20, 27, 47, 0.65);
}

.progress-wrap.hidden {
  display: none;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

progress {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
}

progress::-webkit-progress-bar {
  background: #1a2542;
}

progress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

progress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.waveform {
  width: 100%;
  min-height: 300px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #0f1627, #0c1220);
  overflow: hidden;
}

.waveform.drag-target {
  outline: 2px dashed rgba(143, 107, 255, 0.9);
  outline-offset: 4px;
}

.waveform-toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}

.zoom-control {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--muted);
  font-weight: 600;
}

.zoom-control input[type='range'] {
  width: min(460px, 60vw);
}

.zoom-value {
  min-width: 2.2rem;
  display: inline-block;
  text-align: right;
  color: var(--text);
}

/* Wavesurfer v7 uses shadow parts for regions/handles */
#waveform ::part(region) {
  overflow: visible;
}

#waveform ::part(region-handle),
#waveform ::part(region-handle-left),
#waveform ::part(region-handle-right) {
  width: 18px;
  min-width: 18px;
  background: transparent !important;
  border: none !important;
}

#waveform ::part(region-handle)::after,
#waveform ::part(region-handle-left)::after,
#waveform ::part(region-handle-right)::after {
  content: '';
  position: absolute;
  top: calc(50% - 10px);
  left: calc(50% - 10px);
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: #ffffff;
  border: 2px solid #1f2a45;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}

/* Fallback selectors for non-part handle DOM structures */
.wavesurfer-region [data-resize],
.wavesurfer-region-handle {
  width: 18px !important;
}

.muted {
  color: var(--muted);
}