:root {
  --bg: #0f1117;
  --surface: #171a22;
  --surface-2: #1e222d;
  --border: #2a3040;
  --text: #e8eaef;
  --muted: #8b93a7;
  --accent: #5eead4;
  --accent-dim: #2dd4bf;
  --accent-glow: rgba(94, 234, 212, 0.15);
  --danger: #f87171;
  --marker: #fbbf24;
  --radius: 12px;
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(94, 234, 212, 0.08), transparent),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.app-wide {
  max-width: 1100px;
}

.header {
  margin-bottom: 1.5rem;
}

.app-intro {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.95rem;
}

.app-intro p {
  margin: 0;
}

.app-help {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.9rem;
}

.help-tips {
  margin: 0;
}

.help-tips summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.help-tips ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.help-tips li {
  margin-bottom: 0.35rem;
  line-height: 1.45;
}

.tool-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.tool-nav-link {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.tool-nav-link:hover {
  color: var(--text);
  border-color: var(--muted);
}

.tool-nav-link.active {
  background: var(--accent-glow);
  border-color: rgba(94, 234, 212, 0.35);
  color: var(--accent);
}

.hub-section {
  margin-bottom: 2rem;
}

.hub-category {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}

.tool-card:hover {
  border-color: rgba(94, 234, 212, 0.35);
  background: rgba(94, 234, 212, 0.04);
  transform: translateY(-1px);
}

.tool-card-icon {
  font-size: 1.35rem;
}

.tool-card-name {
  font-weight: 700;
  font-size: 1rem;
}

.tool-card-desc {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

.tool-hint {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.tool-form {
  margin-top: 0.5rem;
}

.info-result {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.info-result h2 {
  margin: 0 0 0.85rem;
  font-size: 1rem;
}

.info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.45rem 1.25rem;
  margin: 0;
}

.info-grid dt {
  color: var(--muted);
  font-size: 0.85rem;
}

.info-grid dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.9rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 10px;
  background: var(--accent-glow);
  border: 1px solid rgba(94, 234, 212, 0.25);
  font-size: 1.4rem;
}

.logo h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.hidden {
  display: none !important;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent-dim);
  background: var(--accent-glow);
}

.dropzone-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

.dropzone-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.dropzone-hint {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.file-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.file-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.file-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-duration {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
}

.waveform-wrap {
  margin-bottom: 1rem;
}

.player {
  margin-bottom: 1.25rem;
}

.player-mount {
  margin-bottom: 1.25rem;
}

.player-unavailable-wrap {
  padding: 1.25rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.player-unavailable {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.resample-warning {
  color: var(--marker);
  margin: -0.25rem 0 1rem;
}

.merge-item.selected {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.clip-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.clip-slot-label {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.dropzone-compact {
  padding: 1.75rem 1rem;
}

.clip-meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-top: 0.65rem;
  font-size: 0.85rem;
}

.clip-meta-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.clip-meta-duration {
  font-family: var(--mono);
  color: var(--muted);
}

.mix-editor {
  margin-top: 1.25rem;
}

.mix-preview-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.option-field input[type="range"] {
  width: 100%;
  accent-color: var(--accent-dim);
}

@media (max-width: 700px) {
  .clip-slots {
    grid-template-columns: 1fr;
  }
}

.player-btn.hidden {
  display: none;
}

.waveform-stack {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface-2);
}

#waveform {
  cursor: pointer;
}

.split-markers {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.split-marker-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  margin-left: -1px;
  background: var(--marker);
  box-shadow: 0 0 8px rgba(251, 191, 36, 0.45);
}

.player-bar {
  margin-top: 0.85rem;
  padding: 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.player-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.transport-row {
  justify-content: space-between;
}

.transport {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.player-btn {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.player-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--accent);
}

.player-btn-main {
  width: 2.75rem;
  height: 2.75rem;
  background: var(--accent-glow);
  border: 1px solid rgba(94, 234, 212, 0.25);
}

.player-btn-main:hover {
  background: rgba(94, 234, 212, 0.22);
}

.player-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

.player-btn-main svg {
  width: 1.35rem;
  height: 1.35rem;
}

.time-display {
  font-family: var(--mono);
  font-size: 0.95rem;
  white-space: nowrap;
}

.time-current {
  color: var(--accent);
}

.time-sep,
.time-total {
  color: var(--muted);
}

.options-row {
  justify-content: flex-start;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 12rem;
  flex: 1;
}

.volume-slider {
  flex: 1;
  min-width: 6rem;
  accent-color: var(--accent-dim);
}

.volume-label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 2.75rem;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.speed-control label {
  font-size: 0.85rem;
  color: var(--muted);
}

.player-select {
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
}

.loop-toggle {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.loop-toggle input {
  accent-color: var(--accent-dim);
}

.split-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.waveform-hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.time-input-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.time-input-group label {
  font-size: 0.85rem;
  color: var(--muted);
}

.time-input-group input {
  width: 8rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
}

.time-input-group input:focus {
  outline: none;
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.btn {
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s, transform 0.1s;
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

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

.btn-primary {
  background: var(--accent-dim);
  color: #0f1117;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--muted);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--muted);
}

.btn-icon {
  padding: 0.35rem 0.55rem;
  background: transparent;
  color: var(--muted);
  border: none;
  font-size: 1.1rem;
  line-height: 1;
}

.btn-icon:hover {
  color: var(--danger);
}

.splits-section {
  margin-bottom: 1.5rem;
}

.splits-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.splits-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.segment-count {
  font-size: 0.85rem;
  color: var(--muted);
}

.splits-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.split-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.split-marker {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--marker);
  flex-shrink: 0;
}

.split-time {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 5.5rem;
}

.split-label {
  flex: 1;
  font-size: 0.85rem;
  color: var(--muted);
}

.empty-splits {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.empty-splits.hidden {
  display: none;
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  min-height: 1.35em;
}

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

.status.success {
  color: var(--accent);
}

.merge-editor {
  margin-top: 1.25rem;
}

.merge-toolbar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.merge-summary {
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.merge-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.merge-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: grab;
}

.merge-item.dragging {
  opacity: 0.55;
}

.merge-item.drag-over {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.merge-handle {
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: -0.15em;
  user-select: none;
}

.merge-index {
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 6px;
  background: var(--accent-glow);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
}

.merge-item-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.merge-item-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.merge-item-duration {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

.merge-hint {
  margin: 0.75rem 0 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.merge-options {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.option-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 10rem;
  flex: 1;
}

.option-field label {
  font-size: 0.85rem;
  color: var(--muted);
}

.option-field input {
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
}

.option-field input:focus {
  outline: none;
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

@media (max-width: 600px) {
  .app {
    padding: 1.25rem 1rem 3rem;
  }

  .transport-row,
  .options-row {
    flex-direction: column;
    align-items: stretch;
  }

  .transport {
    justify-content: center;
    flex-wrap: wrap;
  }

  .time-display {
    text-align: center;
  }

  .volume-control {
    min-width: 0;
  }

  .split-tools {
    flex-direction: column;
    align-items: stretch;
  }

  .time-input-group input {
    flex: 1;
  }
}