* {
  box-sizing: border-box;
}

:root {
  --bg: #0f0f12;
  --surface: #1a1a20;
  --border: #2a2a32;
  --text: #e8e8ec;
  --muted: #888;
  --accent: #7c5cff;
  --accent-hover: #9378ff;
  --on: #00d4aa;
  --bass: #00d4aa;
  --lead: #ff6b9d;
  --alwin: #f0b429;
  --ghost: rgba(255, 255, 255, 0.15);
  --cell-size: 28px;
}

body {
  margin: 0;
  font-family: "SF Mono", "Consolas", "Monaco", monospace;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.4;
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

.header {
  position: relative;
  text-align: center;
  margin-bottom: 1.5rem;
}

.btn-chat {
  position: absolute;
  top: 0.25rem;
  right: 0;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  letter-spacing: 0.05em;
}

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

/* Controls */
.controls {
  margin-bottom: 0.75rem;
}

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

.btn {
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: #252530;
  border-color: #3a3a45;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

#btn-play {
  min-width: 6rem;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-mute {
  background: #c0392b;
  border-color: #c0392b;
  color: #fff;
}

.btn-mute:hover {
  background: #e74c3c;
  border-color: #e74c3c;
}

.btn-mute.muted {
  background: #7f2a20;
  border-color: #7f2a20;
  color: rgba(255, 255, 255, 0.8);
}

.btn-accent {
  background: #00b894;
  border-color: #00b894;
  color: #fff;
}

.btn-accent:hover {
  background: #00d4aa;
  border-color: #00d4aa;
}

.control-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.control-item span {
  color: var(--muted);
}

.control-item input,
.control-item select {
  width: 4.5rem;
  padding: 0.4rem 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
}

.control-slider input[type="range"] {
  width: 5rem;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 3px;
}

.control-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.control-slider output {
  min-width: 2rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

/* Mixer */
.mixer-section {
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.mixer-title {
  margin: 0 0 0.75rem 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.mixer-faders {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-end;
}

.mixer-fader {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  min-width: 5rem;
  max-width: 8rem;
}

.mixer-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
  cursor: pointer;
}
.mixer-label:hover {
  color: var(--text);
}

.mixer-fader input[type="range"] {
  width: 100%;
}

.mixer-fader output {
  font-size: 0.75rem;
  color: var(--muted);
  min-width: 2ch;
}

/* Pattern section */
.pattern-section {
  margin-bottom: 0.75rem;
}

.pattern-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.pattern-count-label {
  font-size: 0.9rem;
  color: var(--muted);
}

.pattern-count-label select {
  margin-left: 0.35rem;
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  font-size: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
}

.pattern-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.pattern-btn {
  padding: 0.35rem 0.6rem;
  font-family: inherit;
  font-size: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.pattern-btn:hover {
  background: #252530;
  border-color: #3a3a45;
}

.pattern-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.pattern-copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.pattern-copy-row select {
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  font-size: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
}

.pattern-copy-to {
  margin: 0 0.1rem;
}

/* Song section — arrangement grid (rows = patterns, columns = measures) */
.song-section {
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.song-grid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.drum-arrangement-row,
.synth-arrangement-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
  margin-top: 0.75rem;
}

.synth-arrangement-row {
  margin-top: 0;
}

.song-view-mode {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.song-grid-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}
.song-grid-title.arranger-instrument-label {
  cursor: pointer;
  border-radius: 2px;
  padding: 0.15rem 0.25rem;
}
.song-grid-title.arranger-instrument-label:hover {
  background: var(--surface-hover);
  color: var(--on);
}

.view-mode-buttons {
  display: flex;
  gap: 0;
}

.view-mode-btn {
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
  border-radius: 0;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.view-mode-btn:first-child {
  border-radius: 6px 0 0 6px;
}

.view-mode-btn:last-child {
  border-radius: 0 6px 6px 0;
}

.view-mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.song-grid-wrap {
  overflow-x: auto;
}

.song-grid {
  display: grid;
  grid-template-columns: 3rem repeat(8, 2.5rem);
  gap: 2px;
  width: max-content;
  font-size: 0.8rem;
}

.song-grid-header-cell {
  padding: 0.25rem;
  text-align: center;
  color: var(--muted);
  font-weight: 600;
}

.song-grid-label-cell {
  display: flex;
  align-items: stretch;
  gap: 2px;
  cursor: pointer;
}

.song-grid-label {
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0.2rem;
  text-align: center;
  font-weight: 600;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.song-grid-label:hover {
  background: #252530;
  border-color: #3a3a45;
}

.song-grid-label.editing {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.song-grid-delete {
  flex-shrink: 0;
  width: 1.5rem;
  padding: 0;
  font-size: 1rem;
  line-height: 1;
  font-weight: 400;
  background: #252530;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.song-grid-delete:hover:not(:disabled) {
  background: #c44;
  color: #fff;
  border-color: #c44;
}

.song-grid-delete:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.song-grid-cell {
  width: 2.5rem;
  height: 2.25rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  background: #1e1e24;
  border: 2px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.song-grid-cell:hover {
  background: #2a2a34;
  border-color: #3a3a45;
}

.song-grid-cell.filled {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.song-grid-cell.col-current {
  box-shadow: inset 0 0 0 2px var(--on);
}

.song-grid-col-header {
  padding: 0.25rem;
  text-align: center;
  color: var(--muted);
  font-weight: 600;
}

button.song-grid-col-header {
  font-family: inherit;
  font-size: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 2px;
}

button.song-grid-col-header:hover {
  color: var(--on);
  background: var(--surface-hover);
}

/* Instrument tabs */
.instrument-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 0.5rem;
}

.tab {
  padding: 0.5rem 1.25rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
  border-right: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tab:first-of-type {
  border-radius: 6px 0 0 6px;
}

.tab:last-of-type {
  border-right: 1px solid var(--border);
  border-radius: 0 6px 6px 0;
}

.tab:hover {
  color: var(--text);
  background: #252530;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  z-index: 1;
}

.tab.active + .tab {
  border-left-color: var(--accent);
}

.tab:nth-child(3) {
  border-right: 1px solid var(--border);
}

.pattern-list-section {
  margin-bottom: 0.75rem;
  padding: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.pattern-list-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.pattern-list-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.pattern-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.pattern-list-btn {
  padding: 0.35rem 0.6rem;
  font-family: inherit;
  font-size: 0.8rem;
  min-width: 2.25rem;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.pattern-list-btn:hover {
  background: #353540;
  border-color: #404050;
}

.pattern-list-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.playlist-section {
  margin-bottom: 0.75rem;
}

.playlist-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.playlist-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.playlist-track {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 2.5rem;
}

.playlist-block {
  flex: 1;
  min-width: 3rem;
  max-width: 4rem;
  padding: 0.4rem 0.25rem;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.playlist-block:hover {
  background: #252530;
  border-color: #3a3a45;
}

.playlist-block.current {
  border-color: var(--on);
  box-shadow: 0 0 6px rgba(0, 212, 170, 0.3);
}

.measure-indicator {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Sequencer */
.sequencer-section {
  margin-bottom: 1rem;
}

.sequencer-wrap {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.piano-labels {
  width: 3rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: #141418;
  border-right: 1px solid var(--border);
  padding: calc(0.25rem + 2px) 0.25rem 0.25rem 0;
}

.piano-labels span {
  height: var(--cell-size);
  min-height: var(--cell-size);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--muted);
}

.grid-wrap {
  overflow-x: auto;
  padding: 0.25rem 0;
}

.sequencer-grid {
  display: grid;
  gap: 2px;
  padding: 2px;
  width: max-content;
}

.step-cell {
  width: var(--cell-size);
  height: var(--cell-size);
  min-width: var(--cell-size);
  min-height: var(--cell-size);
  background: #222228;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: stretch;
  transition: background 0.1s;
}

.step-cell .dot-drum {
  position: absolute;
  inset: 2px;
  border-radius: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.15s;
}

.step-cell:hover {
  background: #2a2a34;
}

.step-cell .dot-bass,
.step-cell .dot-lead,
.step-cell .dot-alwin {
  flex: 1;
  border-radius: 3px;
  margin: 2px;
  min-width: 0;
  transition: opacity 0.15s;
}

.step-cell .dot-bass {
  margin-right: 1px;
}
.step-cell .dot-lead {
  margin-left: 1px;
  margin-right: 1px;
}
.step-cell .dot-alwin {
  margin-left: 1px;
}

/* Dots hidden by default; only show when that layer has a note (ghost or active) */
.step-cell .dot-bass { background: var(--bass); opacity: 0; }
.step-cell .dot-lead { background: var(--lead); opacity: 0; }
.step-cell .dot-alwin { background: var(--alwin); opacity: 0; }

/* Ghost: show other layers at 0.35 when cell has that note */
.step-cell.bass-on .dot-bass { opacity: 0.35; }
.step-cell.lead-on .dot-lead { opacity: 0.35; }
.step-cell.alwin-on .dot-alwin { opacity: 0.35; }

/* Active layer: full opacity when editing that instrument */
.sequencer-wrap.editing-bass .step-cell.bass-on .dot-bass { background: var(--bass); opacity: 1; }
.sequencer-wrap.editing-bass .step-cell.lead-on .dot-lead { background: var(--lead); opacity: 0.35; }
.sequencer-wrap.editing-bass .step-cell.alwin-on .dot-alwin { background: var(--alwin); opacity: 0.35; }
.sequencer-wrap.editing-lead .step-cell.lead-on .dot-lead { background: var(--lead); opacity: 1; }
.sequencer-wrap.editing-lead .step-cell.bass-on .dot-bass { background: var(--bass); opacity: 0.35; }
.sequencer-wrap.editing-lead .step-cell.alwin-on .dot-alwin { background: var(--alwin); opacity: 0.35; }
.sequencer-wrap.editing-alwin .step-cell.alwin-on .dot-alwin { background: var(--alwin); opacity: 1; }
.sequencer-wrap.editing-alwin .step-cell.bass-on .dot-bass { background: var(--bass); opacity: 0.35; }
.sequencer-wrap.editing-alwin .step-cell.lead-on .dot-lead { background: var(--lead); opacity: 0.35; }

.step-cell.current .dot-bass,
.step-cell.current .dot-lead,
.step-cell.current .dot-alwin {
  box-shadow: 0 0 0 1px var(--accent);
}

.step-cell.current.bass-on .dot-bass,
.step-cell.current.lead-on .dot-lead,
.step-cell.current.alwin-on .dot-alwin {
  box-shadow: 0 0 0 1px var(--accent), 0 0 8px rgba(124, 92, 255, 0.4);
}

/* 4/4 measure lines: every 4 steps */
.step-cell.measure-end {
  border-right: 2px solid rgba(124, 92, 255, 0.5);
  margin-right: 1px;
}

/* Drums grid: single layer */
.sequencer-wrap.editing-drums .step-cell.drum-on .dot-drum {
  background: var(--accent);
  opacity: 1;
}

/* Instrument settings */
.instrument-settings {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.preset-row .instrument-settings-title {
  margin: 0;
}

.preset-label {
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.preset-label select {
  padding: 0.35rem 0.5rem;
  font-family: inherit;
  font-size: 0.85rem;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  min-width: 10rem;
}

.drum-preset-row {
  margin-bottom: 0.5rem;
}

.drum-preset-row .preset-label select {
  min-width: 10rem;
}

.instrument-settings-title {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.75rem 0;
  font-weight: 500;
}

.knob-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem 1rem;
}

.knob {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.knob span {
  font-size: 0.75rem;
  color: var(--muted);
}

.knob input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 3px;
  outline: none;
}

.knob input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.knob output {
  font-size: 0.7rem;
  color: var(--muted);
}

.knob-select select {
  padding: 0.25rem 0.4rem;
  font-family: inherit;
  font-size: 0.8rem;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  min-width: 5rem;
}

/* Waveform picker: icon radios */
.waveform-picker {
  grid-column: 1 / -1;
}

.waveform-label {
  font-size: 0.75rem;
  color: var(--muted);
  display: block;
  margin-bottom: 0.35rem;
}

.waveform-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.waveform-opt {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin: 0;
  padding: 0.4rem;
  background: var(--border);
  border: 2px solid transparent;
  border-radius: 6px;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.waveform-opt:hover {
  background: #353540;
}

.waveform-opt input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.waveform-opt input:checked + .waveform-icon,
.waveform-opt input:focus-visible + .waveform-icon {
  outline: none;
}

.waveform-opt:has(input:checked) {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.waveform-opt:has(input:focus-visible) {
  outline: 2px solid var(--on);
  outline-offset: 2px;
}

.waveform-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 14px;
  color: currentColor;
}

.waveform-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.waveform-opt:has(input:checked) .waveform-icon {
  color: #fff;
}

.effect-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
}

.checkbox-label input {
  cursor: pointer;
}

.sound-tips {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.sound-tips summary {
  cursor: pointer;
  color: var(--text);
}

.sound-tips ul {
  margin: 0.5rem 0 0 1rem;
  padding: 0;
}

.sound-tips li {
  margin-bottom: 0.25rem;
}

/* Save section */
.save-section {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.save-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

#song-title {
  flex: 1;
  min-width: 160px;
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
}

#song-title::placeholder {
  color: var(--muted);
}

.saved-list,
.feed {
  margin-bottom: 1.5rem;
}

.saved-list h3,
.feed h3 {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 0.5rem 0;
  font-weight: 500;
}

.saved-list ul,
.feed ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.saved-list li,
.feed li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.saved-list li span,
.feed li span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-list .item-actions,
.feed .item-actions {
  display: flex;
  gap: 0.5rem;
}

.saved-list .btn-small,
.feed .btn-small {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.feed li small {
  color: var(--muted);
  font-size: 0.75rem;
}

.empty-msg {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0.5rem 0;
}

/* Chat panel */
.chat-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 100%;
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.3);
  transform: translateX(100%);
  transition: transform 0.2s ease-out;
}

.chat-panel.open {
  transform: translateX(0);
}

.chat-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.chat-panel-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.btn-icon {
  padding: 0.25rem 0.5rem;
  min-width: 2rem;
  font-size: 1.25rem;
  line-height: 1;
}

.chat-messages {
  list-style: none;
  margin: 0;
  padding: 0.75rem;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chat-messages li {
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  word-break: break-word;
}

.chat-messages .chat-meta {
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.chat-input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.chat-input-row input {
  flex: 1;
  min-width: 0;
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
}

.chat-input-row input::placeholder {
  color: var(--muted);
}

.chat-input-row #chat-author {
  flex: 0 1 100px;
}