:root {
  --bg: #0d1117;
  --panel: #161b24;
  --panel2: #1c232f;
  --border: #2a3342;
  --text: #d7dee9;
  --dim: #8a97ad;
  --accent: #4c8bf5;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.45 system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 15px; letter-spacing: .3px; }
.actions { display: flex; gap: 8px; }
.stats {
  display: flex; gap: 12px; flex-wrap: wrap;
  font-size: 11px; color: var(--dim);
  font-variant-numeric: tabular-nums;
  margin-left: auto;
}
.stats span + span { border-left: 1px solid var(--border); padding-left: 12px; }

button {
  background: var(--panel2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  font-size: 12px;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--dim);
}
.controls label { display: flex; align-items: center; gap: 5px; }
.controls input[type=range] { width: 100px; }
#seek { flex: 1 1 180px; min-width: 120px; }
#time-label { font-variant-numeric: tabular-nums; color: var(--text); min-width: 130px; }

.tracks {
  display: flex;
  gap: 8px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.track-chip {
  display: flex; align-items: center; gap: 7px;
  border: 1px solid var(--border);
  border-left-width: 4px;
  background: var(--panel2);
  border-radius: 8px;
  padding: 5px 8px;
  font-size: 12px;
  white-space: nowrap;
}
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.tname { max-width: 150px; overflow: hidden; text-overflow: ellipsis; }
.tmeta { color: var(--dim); font-size: 11px; }
.tbtns { display: flex; gap: 4px; margin-left: 4px; }
.tbtns select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 5px; font-size: 11px; padding: 2px 4px; }
.tbtns button { padding: 2px 8px; font-size: 11px; }
.tbtns button.on { background: #e94f64; border-color: #e94f64; color: #fff; }

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 380px;
  gap: 10px;
  padding: 10px 14px;
  min-height: 0;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
}
.panel-head h2 { margin: 0; font-size: 12px; text-transform: uppercase; letter-spacing: .5px; color: var(--dim); }
.hint { font-size: 11px; color: var(--dim); }

/* event list */
.event-list { overflow-y: auto; flex: 1; font-family: ui-monospace, monospace; font-size: 11px; }
.evt {
  display: grid;
  grid-template-columns: 64px 46px 1fr;
  gap: 4px 8px;
  padding: 2px 8px;
  cursor: pointer;
  border-bottom: 1px solid #10151d;
  white-space: nowrap;
}
.evt:hover { background: #1d2531; }
.evt.sel { background: #24405e; }
.evt.hl { background: #2c3a4f; }
.e-tick { color: var(--dim); text-align: right; }
.e-delta { color: #5f6c80; }
.e-name { font-weight: 600; }
.e-data { grid-column: 2 / 4; color: var(--dim); }
.r-noteon .e-name { color: #7dd3fc; }
.r-noteoff .e-name { color: #93c5fd; }
.r-tempo .e-name { color: #f9a8d4; }
.r-meta .e-name { color: #93c5fd; }
.r-cc .e-name { color: #d8b4fe; }
.r-prog .e-name { color: #fcd34d; }
.r-bend .e-name { color: #fda4af; }
.evt-more { padding: 6px 8px; color: var(--dim); font-size: 11px; }

/* piano roll */
#roll-panel { min-width: 0; }
#pianoroll { flex: 1; width: 100%; min-height: 200px; cursor: crosshair; }

/* inspector */
.explain { padding: 8px 10px; border-bottom: 1px solid var(--border); }
.ex-head { font-weight: 700; margin-bottom: 2px; }
.ex-meta { font-size: 11px; color: var(--dim); font-variant-numeric: tabular-nums; margin-bottom: 4px; }
.ex-body { font-size: 12px; }
.ex-vlq { margin-top: 6px; font-size: 11px; color: var(--dim); font-family: ui-monospace, monospace; }

.hex {
  flex: 1;
  overflow: auto;
  font-family: ui-monospace, monospace;
  font-size: 11px;
  padding: 6px;
  line-height: 1.5;
}
.hx-row { white-space: nowrap; }
.hx-addr { color: #4b5563; display: inline-block; width: 58px; }
.hx-ascii { color: #4b5563; margin-left: 10px; }
.hx { cursor: pointer; }
.hx:hover { outline: 1px solid #fff; }
.hx-hl { background: #b45309 !important; }
.hx-note { color: #f472b6; }
.hx-cc { color: #c084fc; }
.hx-program { color: #fbbf24; }
.hx-meta { color: #60a5fa; }
.hx-tempo { color: #f9a8d4; }
.hx-sysex { color: #b19cd9; }
.hx-eot { color: #64748b; }
.hx-delta { color: #94a3b8; }
.hx-status { color: #fde68a; }
.hx-header { color: #475569; }
.hx-chunk { color: #64748b; text-decoration: underline; }

.legend { display: flex; gap: 10px; flex-wrap: wrap; padding: 6px 10px; border-top: 1px solid var(--border); font-size: 11px; color: var(--dim); }
.lg { display: flex; align-items: center; gap: 4px; }
.lg i { width: 12px; height: 10px; border-radius: 2px; display: inline-block; }
.lg .hx-note { background: #f472b6; }
.lg .hx-meta { background: #60a5fa; }
.lg .hx-tempo { background: #f9a8d4; }
.lg .hx-cc { background: #c084fc; }
.lg .hx-program { background: #fbbf24; }
.lg .hx-delta { background: #94a3b8; }
.lg .hx-chunk { background: #64748b; }

.guide { padding: 8px 10px; border-top: 1px solid var(--border); font-size: 12px; max-height: 300px; overflow-y: auto; }
.guide summary { cursor: pointer; color: var(--dim); font-weight: 600; }
.guide code { background: var(--bg); padding: 1px 4px; border-radius: 4px; font-size: 11px; }
.guide table { border-collapse: collapse; margin: 6px 0; font-size: 11px; }
.guide td, .guide th { border: 1px solid var(--border); padding: 3px 8px; }
.guide th { color: var(--dim); font-weight: 600; }

.toast {
  position: fixed;
  bottom: 16px; left: 50%;
  transform: translateX(-50%);
  background: #7f1d1d;
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: 0 4px 16px rgba(0,0,0,.5);
}
.hidden { display: none; }

@media (max-width: 1000px) {
  .main { grid-template-columns: 1fr; grid-auto-rows: 320px; }
  #roll-panel { grid-row: 1; }
  .stats { margin-left: 0; }
}