/**
 * Piano-roll & SPA styles.
 * Dark DAW-style theme matching the existing tabs.
 */

:root {
  --bg: #0f1620;
  --panel: #1a2332;
  --panel-2: #131c28;
  --text: #d8e0e8;
  --muted: #8492a6;
  --accent: #2f9e44;
  --accent-dim: #1f6f2d;
  --warn: #e8590c;
  --error: #c92a2a;
  --border: #2c3a52;
  --highlight: #ffd43b;
  --grid-line: #2c3a52;
  --grid-beat: #3d4f6e;
  --grid-bar: #5a7090;
  --note-colors: #4dabf7, #ff6b6b, #51cf66, #ffd43b, #cc5de8, #ff922b, #22b8cf, #f783ac;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  font-size: 13px;
  height: 100%;
  overflow: hidden;
}

header {
  background: var(--panel);
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  flex-shrink: 0;
}
header h1 { margin: 0; font-size: 16px; font-weight: 600; }
header .brand-meta { color: var(--muted); font-size: 11px; margin-left: 12px; }

nav { display: flex; gap: 4px; }
nav button {
  background: transparent; color: var(--muted); border: 1px solid var(--border);
  padding: 6px 12px; cursor: pointer; border-radius: 4px; font-size: 12px;
}
nav button.active { background: var(--accent); color: white; border-color: var(--accent); }
nav button:hover:not(.active) { background: var(--panel-2); color: var(--text); }

main { padding: 0; height: calc(100vh - 50px); overflow: hidden; display: flex; flex-direction: column; }

.tab-panel {
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.tab-panel.hidden { display: none; }

/* ----- Generic panels & buttons ----- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  margin: 10px;
  flex-shrink: 0;
}
.panel h2, .panel h3 { margin-top: 0; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.grow { flex: 1; }

button.primary {
  background: var(--accent); color: white; border: 0; padding: 6px 14px;
  border-radius: 4px; cursor: pointer; font-size: 12px;
}
button.primary:hover { background: var(--accent-dim); }
button.primary:disabled { background: var(--muted); cursor: not-allowed; }
button.danger { background: var(--error); color: white; border: 0; padding: 6px 14px; border-radius: 4px; cursor: pointer; }
button.ghost {
  background: transparent; color: var(--text); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 4px; cursor: pointer; font-size: 11px;
}
button.ghost:hover { background: var(--panel-2); }
button.warn { background: var(--warn); color: white; border: 0; padding: 6px 14px; border-radius: 4px; cursor: pointer; }

input[type="text"], input[type="number"], select {
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  padding: 5px 9px; border-radius: 4px; font-size: 12px;
}
input[type="range"] { accent-color: var(--accent); }
input:focus, select:focus { outline: 2px solid var(--accent); }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 5px 10px; text-align: left; border-bottom: 1px solid var(--border); font-size: 12px; }
th { color: var(--muted); font-weight: 600; background: var(--panel-2); }
tbody tr:hover { background: var(--panel-2); }

pre { background: var(--bg); border: 1px solid var(--border); padding: 8px; border-radius: 4px; overflow: auto; font-size: 11px; }

.chip {
  display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 10px;
  background: var(--border); color: var(--text);
}
.chip.warn { background: var(--warn); color: white; }
.chip.ok { background: var(--accent); color: white; }
.chip.samp { background: #1971c2; color: white; }
.chip.macro { background: #5f3dc4; color: white; }
.chip.wavs { background: var(--warn); color: white; }
.chip.fm { background: #0ca678; color: white; }
.chip.hyper { background: #c2255c; color: white; }
.chip.midiout { background: var(--muted); color: white; }
.chip.empty { background: transparent; color: var(--muted); border: 1px solid var(--border); }

/* ----- Toast ----- */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--panel); border: 1px solid var(--border); padding: 12px 16px;
  border-radius: 4px; z-index: 1000; max-width: 400px; font-size: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}
.toast.ok { border-color: var(--accent); }
.toast.err { border-color: var(--error); }
.toast.hidden { display: none; }

/* ============================================================
 * PIANO ROLL
 * ============================================================ */

.pr-root {
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: auto 1fr;
  height: 100%;
  background: var(--bg);
}

.pr-toolbar {
  grid-column: 1 / 3;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  flex-shrink: 0;
}
.pr-toolbar .sep {
  width: 1px; height: 22px; background: var(--border);
}
.pr-toolbar .label { color: var(--muted); font-size: 11px; }
.pr-toolbar select {
  min-width: 80px;
}
.pr-toolbar .snap-toggle {
  display: flex; gap: 0;
}
.pr-toolbar .snap-toggle button {
  background: var(--bg); color: var(--muted); border: 1px solid var(--border);
  padding: 4px 8px; cursor: pointer; font-size: 11px;
}
.pr-toolbar .snap-toggle button.active { background: var(--accent); color: white; }
.pr-toolbar .snap-toggle button + button { border-left: 0; }

/* Left sidebar: instrument list + view modes */
.pr-sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 10px;
  display: flex; flex-direction: column; gap: 12px;
}
.pr-sidebar h4 {
  margin: 0 0 6px 0; font-size: 11px; text-transform: uppercase;
  color: var(--muted); letter-spacing: 0.5px;
}
.pr-sidebar .inst-row {
  padding: 4px 6px; border-radius: 3px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 11px;
}
.pr-sidebar .inst-row:hover { background: var(--panel-2); }
.pr-sidebar .inst-row.active {
  background: var(--accent-dim); color: white;
}
.pr-sidebar .inst-color {
  width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; flex-shrink: 0;
}
.pr-sidebar .view-mode-tabs {
  display: flex; flex-direction: column; gap: 4px;
}
.pr-sidebar .view-mode-tabs button {
  background: transparent; color: var(--text); border: 1px solid var(--border);
  padding: 5px; cursor: pointer; border-radius: 3px; font-size: 11px; text-align: left;
}
.pr-sidebar .view-mode-tabs button.active {
  background: var(--accent); color: white; border-color: var(--accent);
}

/* Main editor area */
.pr-main {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
}

/* Phrase/Chain/Song selector row */
.pr-context-bar {
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  padding: 6px 12px;
  display: flex; gap: 12px; align-items: center;
  font-size: 11px;
  flex-wrap: wrap;
}
.pr-context-bar .ctx-section { display: flex; gap: 6px; align-items: center; }
.pr-context-bar .ctx-label { color: var(--muted); }
.pr-context-bar .ctx-value { font-weight: 600; color: var(--text); }

/* Piano roll canvas area */
.pr-canvas-area {
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

.pr-canvas-wrap {
  position: absolute;
  inset: 0;
  cursor: crosshair;
  user-select: none;
}

.pr-piano-keys {
  position: absolute;
  left: 0; top: 0;
  width: 50px;
  height: 100%;
  background: var(--panel-2);
  border-right: 1px solid var(--border);
  z-index: 2;
  overflow: hidden;
}
.pr-piano-keys canvas { display: block; }

.pr-grid-area {
  position: absolute;
  left: 50px;
  top: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
}
.pr-grid-area canvas { display: block; }

.pr-playhead {
  position: absolute;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--highlight);
  pointer-events: none;
  z-index: 3;
  box-shadow: 0 0 4px var(--highlight);
}

.pr-statusbar {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 6px 12px;
  font-size: 11px;
  color: var(--muted);
  display: flex; gap: 16px;
  flex-shrink: 0;
}
.pr-statusbar .sep { color: var(--border); }
.pr-statusbar .stat strong { color: var(--text); }

/* Song arrangement view */
.pr-song-canvas-wrap {
  position: absolute;
  inset: 0;
  overflow: auto;
}
.pr-song-canvas-wrap canvas { display: block; }

.pr-song-row-label {
  background: var(--panel-2);
  color: var(--muted);
  font-size: 10px;
  padding: 4px 8px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* Help overlay */
.pr-help {
  position: absolute;
  bottom: 30px; right: 10px;
  background: rgba(26, 35, 50, 0.95);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 4px;
  font-size: 10px;
  color: var(--muted);
  max-width: 240px;
  z-index: 4;
  line-height: 1.6;
}
.pr-help kbd {
  background: var(--bg); border: 1px solid var(--border);
  padding: 1px 4px; border-radius: 2px; font-size: 9px;
  font-family: ui-monospace, monospace;
}