*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0c0b0a;
  --surface: #161413;
  --surface-2: #1e1c1a;
  --surface-3: #262320;
  --border: #2a2725;
  --border-light: #3a3633;
  --text: #e8e0d6;
  --text-dim: #8a8279;
  --text-muted: #5a544d;
  --amber: #d4a04a;
  --amber-dim: #a67c35;
  --amber-glow: #d4a04a33;
  --red: #c75050;
  --green: #5a9a6a;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-weight: 300;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px;
  pointer-events: none;
  z-index: 9999;
}

/* ─── Header ─── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.logo {
  font-family: 'Instrument Serif', serif;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.logo span { color: var(--amber); }

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.info-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: none;
  background: var(--amber-dim);
  color: var(--bg);
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-btn:hover {
  background: var(--amber);
}

.midi-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.3s, box-shadow 0.3s;
}

.status-dot.connected {
  background: var(--green);
  box-shadow: 0 0 8px #5a9a6a88;
}

.status-dot.error {
  background: var(--red);
  box-shadow: 0 0 8px #c7505088;
}

/* ─── Main Layout ─── */
.main {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* ─── Sidebar ─── */
.sidebar {
  width: 280px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow-y: auto;
}

.sidebar-section {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.device-select {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  font-weight: 300;
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%238a8279' stroke-width='1.2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: border-color 0.2s;
}

.device-select:hover { border-color: var(--border-light); }
.device-select:focus { outline: none; border-color: var(--amber-dim); }

.refresh-btn {
  margin-top: 8px;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.refresh-btn:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.file-drop {
  border: 1px dashed var(--border-light);
  border-radius: 6px;
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
}

.file-drop:hover, .file-drop.drag-over {
  border-color: var(--amber-dim);
  background: var(--amber-glow);
}

.file-drop-icon {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--text-muted);
  transition: color 0.25s;
}

.file-drop:hover .file-drop-icon { color: var(--amber); }

.file-drop-text {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.6;
}

.file-drop-text strong {
  color: var(--text);
  font-weight: 400;
}

.file-drop input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.search-input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  font-weight: 300;
  padding: 8px 12px;
  border-radius: 4px;
  transition: border-color 0.2s;
}

.search-input::placeholder { color: var(--text-muted); }
.search-input:hover { border-color: var(--border-light); }
.search-input:focus { outline: none; border-color: var(--amber-dim); }

/* ─── Song List ─── */
.song-list {
  margin-top: 10px;
  max-height: 280px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.song-item {
  padding: 8px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
  border: none;
  background: none;
  text-align: left;
  font-family: 'DM Mono', monospace;
  width: 100%;
}

.song-item:hover {
  background: var(--surface-2);
}

.song-item.active {
  background: var(--amber-glow);
}

.song-title {
  font-size: 11px;
  color: var(--text);
  font-weight: 300;
  line-height: 1.4;
  display: block;
  pointer-events: none;
}

.song-duration {
  font-size: 10px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.song-list-empty {
  font-size: 11px;
  color: var(--text-muted);
  padding: 12px 0;
  text-align: center;
}

.track-info {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.8;
}

.track-info .label {
  color: var(--text-muted);
  display: inline-block;
  width: 78px;
}

.track-info .value { color: var(--text); }
.track-info .value.warn { color: var(--red); }
.track-info .value.good { color: var(--green); }

.track-name {
  font-size: 13px;
  color: var(--text);
  font-weight: 400;
  margin-bottom: 8px;
  word-break: break-word;
}

/* ─── Content Area ─── */
.content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.piano-roll-container {
  flex: 1;
  position: relative;
  min-height: 0;
  background: var(--surface);
}

#pianoRoll {
  width: 100%;
  height: 100%;
  display: block;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  pointer-events: none;
  transition: opacity 0.4s;
}

.empty-state.hidden { opacity: 0; }

.empty-state-icon {
  font-size: 48px;
  color: var(--text-muted);
  opacity: 0.4;
}

.empty-state-text {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.6;
}

/* ─── Transport Bar ─── */
.transport {
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0;
  background: var(--surface);
}

.transport-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.transport-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

.transport-btn:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.transport-btn.active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg);
}

.transport-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.transport-btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.progress-section {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.time-display {
  font-size: 12px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  min-width: 46px;
  text-align: center;
}

.progress-track {
  flex: 1;
  height: 4px;
  background: var(--surface-3);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--amber);
  border-radius: 2px;
  width: 0%;
  transition: width 0.1s linear;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  right: -4px;
  top: -4px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.15s;
}

.progress-track:hover .progress-fill::after { opacity: 1; }

.tempo-section {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tempo-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.tempo-value {
  font-size: 12px;
  color: var(--amber);
  min-width: 38px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.tempo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 3px;
  background: var(--surface-3);
  border-radius: 2px;
  outline: none;
}

.tempo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  background: var(--text-dim);
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s;
}

.tempo-slider::-webkit-slider-thumb:hover { background: var(--text); }

/* ─── Modal ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  transform: translateY(10px);
  transition: transform 0.25s;
}

.modal-overlay.show .modal {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  transition: color 0.15s;
  line-height: 1;
}

.modal-close:hover { color: var(--text); }

.modal-title {
  font-family: 'Instrument Serif', serif;
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 20px;
}

.modal-title span { color: var(--amber); }

.modal-body h3 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 18px 0 8px;
  font-weight: 400;
}

.modal-body p {
  font-size: 12px;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 6px;
}

.modal-body a {
  color: var(--amber);
  text-decoration: none;
}

.modal-body a:hover { text-decoration: underline; }

.modal-body kbd {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 6px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--text);
}

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface-3);
  border: 1px solid var(--border-light);
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 12px;
  color: var(--text);
  opacity: 0;
  transition: all 0.3s;
  pointer-events: none;
  z-index: 100;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }