/* ============================================================
   RIFF GENERATOR — style.css
   ============================================================ */
:root {
  --bg:      #03030f;
  --panel:   #080818;
  --border:  #161630;
  --cyan:    #00d4ff;
  --purple:  #7b2fff;
  --green:   #00ff9d;
  --amber:   #ffb300;
  --red:     #ff5555;
  --text:    #dde0ff;
  --dim:     #505078;
  --root-bg: rgba(0,212,255,0.07);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Arial, sans-serif;
  min-height: 100vh;
  padding: 20px 16px 56px;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── HEADER ─────────────────────────────────────────────── */
.app-header {
  text-align: center;
  padding: 32px 20px 22px;
}
.hdr-icon {
  font-size: 48px;
  line-height: 1;
  margin-bottom: 10px;
}
.app-header h1 {
  font-size: 2.3rem;
  font-weight: 900;
  letter-spacing: .18em;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hdr-sub {
  color: var(--dim);
  font-size: .85rem;
  letter-spacing: .1em;
  margin-top: 8px;
}

/* ── PANELS ──────────────────────────────────────────────── */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
}
.panel-title {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .15em;
  color: var(--dim);
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.badge {
  font-weight: 900;
  font-size: .78rem;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── SETTINGS GRID ───────────────────────────────────────── */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
  gap: 14px;
  align-items: start;
}
.setting-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.setting-item.wide {
  grid-column: span 2;
}
.setting-item label {
  font-size: .71rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--dim);
  text-transform: uppercase;
}
.val {
  color: var(--cyan);
  font-weight: 900;
  font-size: .9rem;
}

select {
  width: 100%;
  background: #0c0c22;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 9px 11px;
  font-size: .88rem;
  cursor: pointer;
  appearance: none;
  transition: border-color .18s;
}
select:hover, select:focus {
  border-color: var(--cyan);
  outline: none;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--cyan);
  cursor: pointer;
  height: 34px;
  padding: 0;
}

/* ── TOGGLE BUTTON ───────────────────────────────────────── */
.toggle-btn {
  width: 100%;
  padding: 9px 12px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  font-size: .88rem;
  cursor: pointer;
  transition: all .18s;
  text-align: center;
}
.toggle-btn.active {
  border-color: var(--cyan);
  background: var(--root-bg);
  color: var(--cyan);
  font-weight: 700;
}

/* ── TIME SIGNATURE BUTTONS ──────────────────────────────── */
.timesig-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.timesig-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  cursor: pointer;
  transition: all .18s;
  min-width: 64px;
}
.timesig-btn:hover { border-color: var(--purple); color: var(--text); }
.timesig-btn.active {
  border-color: var(--purple);
  background: rgba(123,47,255,.14);
  color: #c084fc;
}
.ts-label { font-size: 1rem; font-weight: 900; letter-spacing: .04em; }
.ts-tag   { font-size: .62rem; color: var(--dim); margin-top: 2px; }
.timesig-btn.active .ts-tag { color: rgba(192,132,252,.7); }

/* ── BEATBOX GRID ────────────────────────────────────────── */
.beat-grid {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 14px;
}
.drum-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.drum-label {
  font-size: .75rem;
  color: var(--dim);
  min-width: 72px;
  text-align: right;
  letter-spacing: .04em;
}
.drum-cells {
  display: flex;
  gap: 4px;
  flex-wrap: nowrap;
}
.step-btn {
  width: 32px;
  height: 32px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: #0c0c22;
  cursor: pointer;
  transition: all .12s;
  padding: 0;
}
.step-btn.accent {
  border-color: rgba(123,47,255,.35);
}
.step-btn:hover {
  border-color: var(--green);
  background: rgba(0,255,157,.08);
}
.step-btn.active {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 6px rgba(0,255,157,.4);
}
.step-btn.accent.active {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(0,212,255,.45);
}

.beat-controls {
  display: flex;
  gap: 9px;
}
.reset-btn {
  padding: 11px 18px;
  border-radius: 9px;
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  transition: all .18s;
}
.reset-btn:hover {
  border-color: var(--dim);
  color: var(--text);
}

/* ── INSTRUMENT BUTTONS ──────────────────────────────────── */
.instr-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.instr-btn {
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  font-size: .88rem;
  cursor: pointer;
  transition: all .18s;
  letter-spacing: .03em;
}
.instr-btn:hover { border-color: var(--cyan); color: var(--text); }
.instr-btn.active {
  border-color: var(--cyan);
  background: var(--root-bg);
  color: var(--cyan);
  font-weight: 700;
}

/* ── ARTICULATION BUTTONS ────────────────────────────────── */
.artic-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.artic-btn {
  padding: 7px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  font-size: .85rem;
  cursor: pointer;
  transition: all .18s;
  letter-spacing: .04em;
}
.artic-btn:hover { border-color: var(--purple); color: var(--text); }
.artic-btn.active {
  border-color: var(--purple);
  background: rgba(123,47,255,.12);
  color: #c084fc;
  font-weight: 700;
}

/* ── NOTE VALUE BUTTONS ──────────────────────────────────── */
.noteval-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.noteval-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  font-size: .88rem;
  font-family: monospace;
  font-weight: 700;
  letter-spacing: .05em;
  cursor: pointer;
  transition: all .18s;
  min-width: 52px;
  text-align: center;
}
.noteval-btn:hover {
  border-color: var(--amber);
  color: var(--text);
}
.noteval-btn.active {
  border-color: var(--amber);
  background: rgba(255,179,0,.12);
  color: var(--amber);
}
.panel-hint {
  font-size: .65rem;
  color: var(--dim);
  font-weight: 400;
  letter-spacing: .05em;
  text-transform: none;
}

/* ── CONTOUR BUTTONS ─────────────────────────────────────── */
.contour-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.contour-btn {
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
  font-size: .85rem;
  cursor: pointer;
  transition: all .18s;
  letter-spacing: .04em;
}
.contour-btn:hover {
  border-color: var(--purple);
  color: var(--text);
}
.contour-btn.active {
  border-color: var(--cyan);
  background: var(--root-bg);
  color: var(--cyan);
  font-weight: 700;
}

/* ── PRIMARY BUTTON ──────────────────────────────────────── */
.primary-btn {
  width: 100%;
  padding: 15px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: .12em;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
  cursor: pointer;
  transition: all .2s;
  text-transform: uppercase;
}
.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0,212,255,.3);
}
.primary-btn:active {
  transform: none;
}

/* ── NOTE TILES ──────────────────────────────────────────── */
.notes-display {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 12px;
}

.note-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 50px;
  padding: 9px 7px;
  border-radius: 7px;
  background: #0c0c22;
  border: 1px solid var(--border);
  transition: transform .1s, border-color .1s, background .1s, box-shadow .1s;
  user-select: none;
}
.note-tile.root {
  border-color: rgba(0, 212, 255, 0.28);
}
.note-tile.rest {
  opacity: .35;
  border-style: dashed;
}
.note-tile.playing {
  border-color: var(--green);
  background: rgba(0,255,157,.12);
  transform: translateY(-4px);
  box-shadow: 0 5px 16px rgba(0,255,157,.28);
}

.note-name {
  font-size: .82rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: .04em;
}
.note-tile.root    .note-name { color: var(--cyan);  }
.note-tile.playing .note-name { color: var(--green); }

.note-dur {
  font-size: .62rem;
  color: var(--dim);
  margin-top: 3px;
}

/* ── RIFF INFO CHIPS ─────────────────────────────────────── */
.riff-info {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.info-chip {
  padding: 3px 10px;
  border-radius: 20px;
  font-size: .71rem;
  background: #0c0c22;
  border: 1px solid var(--border);
  color: var(--dim);
}
.info-chip.riff-num {
  color: var(--cyan);
  border-color: rgba(0,212,255,.4);
}

/* ── PLAYBACK ────────────────────────────────────────────── */
.pb-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}
.play-btn, .stop-btn {
  padding: 13px 24px;
  border-radius: 9px;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: .07em;
  transition: all .18s;
  border: none;
}
.play-btn {
  flex: 1;
  border: 1px solid var(--green);
  background: rgb(255 0 0);
  color: var(--green);
}
.play-btn:hover:not(:disabled) {
  background: rgba(0,255,157,.18);
  box-shadow: 0 4px 18px rgba(0,255,157,.25);
}
.stop-btn {
  min-width: 90px;
  border: 1px solid var(--red);
  background: rgb(255 0 0);
  color: #ffffff;
}
.stop-btn:hover:not(:disabled) {
  background: rgba(255,85,85,.18);
}
.play-btn:disabled,
.stop-btn:disabled {
  opacity: .3;
  cursor: not-allowed;
}

.loop-btn {
  min-width: 90px;
  padding: 13px 18px;
  border-radius: 9px;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: .07em;
  transition: all .18s;
  border: 1px solid var(--border);
  background: #0c0c22;
  color: var(--dim);
}
.loop-btn:hover {
  border-color: var(--amber);
  color: var(--text);
}
.loop-btn.active {
  border-color: var(--amber);
  background: rgba(255,179,0,.14);
  color: var(--amber);
  box-shadow: 0 0 10px rgba(255,179,0,.2);
}

/* ── PLAYBACK BUTTONS ────────────────────────────────────── */
.pb-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}
.pb-controls--secondary { margin-bottom: 14px; }

.play-both-btn {
  flex: 1;
  padding: 15px;
  border-radius: 9px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: .07em;
  border: none;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
  transition: all .2s;
  text-transform: uppercase;
}
.play-both-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0,212,255,.3);
}
.play-both-btn:disabled { opacity: .35; cursor: not-allowed; }

.play-btn-sm {
  flex: 1;
  padding: 9px 14px;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--green);
  background: rgb(255 0 0);
  color: var(--green);
  transition: all .18s;
}
.play-btn-sm:hover:not(:disabled) { background: rgba(0,255,157,.18); }
.play-btn-sm:disabled { opacity: .3; cursor: not-allowed; }

.stop-btn-sm {
  padding: 9px 14px;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--red);
  background: rgba(255,85,85,.08);
  color: var(--red);
  transition: all .18s;
}
.stop-btn-sm:hover:not(:disabled) { background: rgba(255,85,85,.18); }
.stop-btn-sm:disabled { opacity: .3; cursor: not-allowed; }

/* ── PROGRESS BAR ────────────────────────────────────────── */
.pb-bar-wrap {
  display: flex;
  align-items: center;
  gap: 11px;
}
.pb-bar {
  flex: 1;
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.pb-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 3px;
  transition: width .05s linear;
}
.pb-time {
  font-size: .78rem;
  color: var(--dim);
  min-width: 90px;
  font-family: monospace;
  text-align: right;
}

/* ── DOWNLOAD ────────────────────────────────────────────── */
.wav-info {
  margin-bottom: 12px;
  font-size: .84rem;
  min-height: 20px;
}
.wav-warn { color: var(--amber); }
.wav-ok   { color: var(--green); }
.dl-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.dl-btn {
  padding: 13px 26px;
  border-radius: 9px;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--amber);
  background: rgba(255,179,0,.09);
  color: var(--amber);
  letter-spacing: .07em;
  transition: all .18s;
}
.dl-btn:hover:not(:disabled) {
  background: rgba(255,179,0,.2);
  box-shadow: 0 4px 18px rgba(255,179,0,.22);
}
.dl-btn:disabled {
  opacity: .35;
  cursor: not-allowed;
}
.dl-btn-cyan {
  border-color: var(--cyan);
  background: rgba(0,212,255,.09);
  color: var(--cyan);
}
.dl-btn-cyan:hover:not(:disabled) {
  background: rgba(0,212,255,.2);
  box-shadow: 0 4px 18px rgba(0,212,255,.22);
}
.dl-btn-green {
  border-color: var(--green);
  background: rgba(0,255,157,.09);
  color: var(--green);
}
.dl-btn-green:hover:not(:disabled) {
  background: rgba(0,255,157,.2);
  box-shadow: 0 4px 18px rgba(0,255,157,.22);
}
.dl-status {
  font-size: .9rem;
  color: var(--dim);
}

/* ── PIANO ROLL ──────────────────────────────────────────── */
.pr-outer {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #06060f;
}
.pr-label-col {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  width: 46px;
  border-right: 1px solid var(--border);
  overflow: hidden;
}
.pr-row-label {
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 7px;
  font-size: .65rem;
  font-family: 'Consolas', 'Courier New', monospace;
  color: var(--dim);
  flex-shrink: 0;
  border-bottom: 1px solid rgba(255,255,255,.03);
  user-select: none;
}
.pr-row-label.is-root { color: var(--amber); font-weight: 700; }
.pr-scroll-area {
  overflow-x: auto;
  overflow-y: hidden;
  flex: 1;
}
.pr-grid {
  display: grid;
  /* columns/rows set via JS */
}
.pr-cell {
  width: 28px;
  height: 24px;
  box-sizing: border-box;
  border-right: 1px solid rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.04);
  cursor: pointer;
  transition: background .07s;
}
.pr-cell.bar-start   { border-left: 2px solid rgba(255,255,255,.18); }
.pr-cell.beat-start  { border-left: 1px solid rgba(255,255,255,.09); }
.pr-cell:hover:not(.note) { background: rgba(255,255,255,.07); }

/* Note cells */
.pr-cell.note {
  background: rgba(0,212,255,.45);
  border-top: 1px solid rgba(0,212,255,.7);
  border-bottom: 1px solid rgba(0,212,255,.2);
  border-right: 1px solid rgba(0,212,255,.15);
}
.pr-cell.note.note-start {
  background: rgba(0,212,255,.65);
  border-left: 3px solid var(--cyan);
  border-radius: 3px 0 0 3px;
}
.pr-cell.note.note-end   { border-radius: 0 3px 3px 0; }
.pr-cell.note.note-start.note-end { border-radius: 3px; }

/* Root note — amber colour */
.pr-cell.note.is-root {
  background: rgba(255,179,0,.4);
  border-top: 1px solid rgba(255,179,0,.7);
  border-bottom: 1px solid rgba(255,179,0,.2);
  border-right: 1px solid rgba(255,179,0,.15);
}
.pr-cell.note.is-root.note-start {
  background: rgba(255,179,0,.62);
  border-left: 3px solid var(--amber);
}

/* Playhead */
.pr-cell.pr-playing            { filter: brightness(1.7); }
.pr-cell.pr-playing:not(.note) { background: rgba(255,255,255,.14); }

.pr-hint {
  margin-top: 9px;
  font-size: .72rem;
  color: var(--dim);
  text-align: center;
  user-select: none;
}

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 30px 20px;
  margin-top: 20px;
  border-top: 1px solid var(--border);
}
.footer p {
  font-size: .72rem;
  color: var(--dim);
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 560px) {
  .settings-grid { grid-template-columns: 1fr 1fr; }
  .setting-item.wide { grid-column: span 2; }
  .app-header h1 { font-size: 1.7rem; }
  .contour-btn { padding: 8px 12px; font-size: .8rem; }
}