@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Rajdhani:wght@300;400;500;600;700&family=Share+Tech+Mono&display=swap');

:root {
  --bg: #0a0a0f;
  --bg2: #0f0f1a;
  --bg3: #13131f;
  --card: #141420;
  --card2: #1a1a28;
  --violet: #7c3aed;
  --violet-light: #a855f7;
  --cyan: #06b6d4;
  --cyan-light: #22d3ee;
  --rose: #f43f5e;
  --rose-light: #fb7185;
  --green: #10b981;
  --amber: #f59e0b;
  --text: #e2e8f0;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --border: rgba(124,58,237,0.2);
  --glow-v: 0 0 20px rgba(124,58,237,0.4);
  --glow-c: 0 0 20px rgba(6,182,212,0.4);
  --glow-r: 0 0 20px rgba(244,63,94,0.4);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Rajdhani', sans-serif;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* CANVAS BG */
#particles-canvas {
  position: fixed;
  top:0; left:0;
  width:100%; height:100%;
  pointer-events:none;
  z-index:0;
  opacity:0.4;
}

/* SIDEBAR NAV */
.sidebar {
  position: fixed;
  left:0; top:0;
  width: 240px;
  height: 100vh;
  background: rgba(10,10,15,0.95);
  border-right: 1px solid var(--border);
  z-index: 100;
  display:flex;
  flex-direction:column;
  padding: 24px 0;
  backdrop-filter: blur(20px);
}

.sidebar-logo {
  padding: 0 24px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.sidebar-logo h1 {
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  font-weight:900;
  background: linear-gradient(135deg, var(--violet-light), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing:0.05em;
}
.sidebar-logo span {
  font-size:0.75rem;
  color: var(--text-muted);
  font-family:'Rajdhani',sans-serif;
  letter-spacing:0.1em;
  text-transform:uppercase;
}

.nav-section {
  padding: 8px 16px 4px;
  font-size:0.65rem;
  color:var(--text-muted);
  letter-spacing:0.15em;
  text-transform:uppercase;
  font-family:'Orbitron',monospace;
}

.nav-item {
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px 24px;
  color:var(--text-dim);
  text-decoration:none;
  font-size:0.95rem;
  font-weight:500;
  transition: all 0.2s;
  letter-spacing:0.02em;
  cursor:pointer;
  border:none;
  background:none;
  width:100%;
  text-align:left;
}
.nav-item:hover, .nav-item.active {
  color:var(--cyan-light);
  background: rgba(6,182,212,0.08);
}
.nav-item.active {
  border-left: 3px solid var(--cyan);
}
.nav-item .icon { font-size:1.1rem; width:20px; text-align:center; }

/* MAIN CONTENT */
.main {
  margin-left:240px;
  min-height:100vh;
  position:relative;
  z-index:1;
}

.page {
  display:none;
  padding: 32px 40px;
  max-width: 1400px;
  animation: fadeIn 0.3s ease;
}
.page.active { display:block; }

@keyframes fadeIn { from {opacity:0; transform:translateY(8px)} to {opacity:1; transform:translateY(0)} }

/* PAGE HEADER */
.page-header {
  margin-bottom:32px;
}
.page-header h2 {
  font-family:'Orbitron',monospace;
  font-size:1.8rem;
  font-weight:700;
  background: linear-gradient(135deg, var(--violet-light) 0%, var(--cyan-light) 100%);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  letter-spacing:0.05em;
  margin-bottom:6px;
}
.page-header p {
  color:var(--text-muted);
  font-size:0.95rem;
  letter-spacing:0.02em;
}

/* CARDS */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius:12px;
  padding:24px;
  margin-bottom:20px;
  position:relative;
  overflow:hidden;
}
.card::before {
  content:'';
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background: linear-gradient(90deg, transparent, var(--violet), transparent);
  opacity:0.5;
}
.card-title {
  font-family:'Orbitron',monospace;
  font-size:0.85rem;
  color:var(--violet-light);
  letter-spacing:0.1em;
  text-transform:uppercase;
  margin-bottom:16px;
  display:flex;
  align-items:center;
  gap:8px;
}

/* GRID */
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.grid-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:20px; }
.grid-4 { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }

/* INPUTS */
input[type=text], input[type=number], select, textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius:8px;
  color:var(--text);
  font-family:'Rajdhani',sans-serif;
  font-size:1rem;
  padding:10px 14px;
  width:100%;
  outline:none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(6,182,212,0.1);
}
select option { background:var(--bg2); }
label {
  font-size:0.85rem;
  color:var(--text-dim);
  display:block;
  margin-bottom:6px;
  letter-spacing:0.05em;
}

/* BUTTONS */
.btn {
  padding: 10px 20px;
  border-radius:8px;
  border:none;
  font-family:'Rajdhani',sans-serif;
  font-size:1rem;
  font-weight:600;
  letter-spacing:0.05em;
  cursor:pointer;
  transition: all 0.2s;
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  color:white;
}
.btn-primary:hover { opacity:0.85; transform:translateY(-1px); box-shadow:var(--glow-v); }
.btn-cyan {
  background: rgba(6,182,212,0.15);
  color:var(--cyan-light);
  border:1px solid rgba(6,182,212,0.3);
}
.btn-cyan:hover { background:rgba(6,182,212,0.25); box-shadow:var(--glow-c); }
.btn-rose {
  background: rgba(244,63,94,0.15);
  color:var(--rose-light);
  border:1px solid rgba(244,63,94,0.3);
}
.btn-rose:hover { background:rgba(244,63,94,0.25); }
.btn-sm { padding:6px 14px; font-size:0.85rem; }

/* TAGS / BADGES */
.badge {
  display:inline-flex;
  align-items:center;
  padding:3px 10px;
  border-radius:20px;
  font-size:0.75rem;
  font-weight:600;
  letter-spacing:0.05em;
  font-family:'Orbitron',monospace;
}
.badge-violet { background:rgba(124,58,237,0.2); color:var(--violet-light); border:1px solid rgba(124,58,237,0.3); }
.badge-cyan { background:rgba(6,182,212,0.2); color:var(--cyan-light); border:1px solid rgba(6,182,212,0.3); }
.badge-rose { background:rgba(244,63,94,0.2); color:var(--rose-light); border:1px solid rgba(244,63,94,0.3); }
.badge-green { background:rgba(16,185,129,0.2); color:#34d399; border:1px solid rgba(16,185,129,0.3); }
.badge-amber { background:rgba(245,158,11,0.2); color:#fbbf24; border:1px solid rgba(245,158,11,0.3); }

/* RESULT DISPLAY */
.result-box {
  background: var(--bg);
  border:1px solid var(--border);
  border-radius:8px;
  padding:16px;
  font-family:'Share Tech Mono',monospace;
  font-size:0.9rem;
  color:var(--cyan-light);
  min-height:60px;
  white-space:pre-wrap;
  line-height:1.6;
}

/* PIANO KEYS */
.piano-wrap {
  overflow-x:auto;
  padding:8px 0;
}
.piano {
  display:flex;
  position:relative;
  height:110px;
  min-width:600px;
}
.piano-key {
  position:relative;
  border-radius:0 0 6px 6px;
  cursor:pointer;
  transition: background 0.1s, transform 0.1s;
  flex-shrink:0;
}
.piano-key.white {
  width:42px;
  height:110px;
  background:linear-gradient(180deg,#1e1e2e 0%,#2a2a40 100%);
  border:1px solid #3a3a55;
  z-index:1;
}
.piano-key.white:hover { background:linear-gradient(180deg,#2a2a4a 0%,#3a3a60 100%); }
.piano-key.white.active { background:linear-gradient(180deg,var(--cyan) 0%,var(--violet) 100%) !important; box-shadow:var(--glow-c); }
.piano-key.black {
  width:28px;
  height:68px;
  background:linear-gradient(180deg,#0a0a12 0%,#1a1a28 100%);
  border:1px solid #2a2a40;
  z-index:2;
  margin-left:-14px;
  margin-right:-14px;
}
.piano-key.black:hover { background:linear-gradient(180deg,#1a1a28 0%,#2a2a40 100%); }
.piano-key.black.active { background:linear-gradient(180deg,var(--violet) 0%,var(--rose) 100%) !important; box-shadow:var(--glow-v); }
.piano-key.root-highlight { background:linear-gradient(180deg,var(--rose) 0%,var(--violet) 100%) !important; }

/* NOTE LABELS */
.note-name {
  position:absolute;
  bottom:6px;
  left:50%;
  transform:translateX(-50%);
  font-size:0.6rem;
  font-family:'Orbitron',monospace;
  color:var(--text-muted);
  pointer-events:none;
}

/* CHORD CARDS */
.chord-grid {
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.chord-card {
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:8px;
  padding:12px 16px;
  cursor:pointer;
  transition:all 0.2s;
  min-width:100px;
  text-align:center;
}
.chord-card:hover {
  border-color:var(--cyan);
  box-shadow:var(--glow-c);
  transform:translateY(-2px);
}
.chord-card.selected {
  border-color:var(--violet);
  box-shadow:var(--glow-v);
  background:rgba(124,58,237,0.1);
}
.chord-card .chord-name {
  font-family:'Orbitron',monospace;
  font-size:1rem;
  color:var(--text);
  margin-bottom:4px;
}
.chord-card .chord-notes {
  font-size:0.75rem;
  color:var(--text-muted);
  font-family:'Share Tech Mono',monospace;
}
.chord-card .chord-function {
  font-size:0.7rem;
  color:var(--violet-light);
  margin-top:4px;
  letter-spacing:0.05em;
}

/* BPM PULSE */
.bpm-circle {
  width:120px; height:120px;
  border-radius:50%;
  border:2px solid var(--violet);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:all 0.1s;
  position:relative;
}
.bpm-circle:active { transform:scale(0.92); background:rgba(124,58,237,0.2); }
.bpm-circle .bpm-num {
  font-family:'Orbitron',monospace;
  font-size:2.2rem;
  font-weight:900;
  color:var(--violet-light);
}
.bpm-circle .bpm-label {
  font-size:0.7rem;
  color:var(--text-muted);
  letter-spacing:0.1em;
}
.bpm-flash { animation: bpmFlash 0.1s ease; }
@keyframes bpmFlash {
  0% { box-shadow:0 0 40px var(--violet); border-color:var(--cyan); }
  100% { box-shadow:none; }
}

/* VISUALIZER */
.viz-bars {
  display:flex;
  align-items:flex-end;
  gap:2px;
  height:60px;
}
.viz-bar {
  width:8px;
  border-radius:2px 2px 0 0;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  transition: height 0.1s;
}

/* SCALE DISPLAY */
.scale-display {
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:12px;
}
.scale-note {
  width:48px; height:48px;
  border-radius:8px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  font-family:'Orbitron',monospace;
  font-size:0.85rem;
  font-weight:700;
  transition:all 0.2s;
  cursor:pointer;
}
.scale-note.in-scale {
  background:rgba(6,182,212,0.15);
  border:1px solid rgba(6,182,212,0.4);
  color:var(--cyan-light);
}
.scale-note.root {
  background:rgba(244,63,94,0.2);
  border:1px solid rgba(244,63,94,0.5);
  color:var(--rose-light);
}
.scale-note.out { background:var(--bg); border:1px solid #1e1e30; color:#333; }
.scale-note small { font-size:0.55rem; color:var(--text-muted); letter-spacing:0.05em; }

/* PROGRESSION BUILDER */
.progression-row {
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}
.prog-chord {
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:8px;
  padding:10px 14px;
  font-family:'Orbitron',monospace;
  font-size:0.9rem;
  color:var(--text);
  position:relative;
}
.prog-arrow {
  color:var(--violet);
  font-size:1.2rem;
}
.prog-chord .remove-btn {
  position:absolute;
  top:-6px; right:-6px;
  width:18px; height:18px;
  border-radius:50%;
  background:var(--rose);
  border:none;
  color:white;
  font-size:0.65rem;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
}

/* FL STUDIO COLORS */
.fl-channel { display:flex; align-items:center; gap:10px; padding:8px 12px; background:var(--bg); border-radius:6px; border:1px solid var(--border); margin-bottom:6px; }
.fl-color { width:14px; height:14px; border-radius:3px; flex-shrink:0; }

/* KEY DISPLAY */
.key-display {
  font-family:'Orbitron',monospace;
  font-size:3rem;
  font-weight:900;
  text-align:center;
  padding:20px;
  background: linear-gradient(135deg, var(--violet-light), var(--cyan-light));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}

/* TABS */
.tabs {
  display:flex;
  gap:4px;
  margin-bottom:20px;
  border-bottom:1px solid var(--border);
  padding-bottom:0;
}
.tab {
  padding:8px 20px;
  border:none;
  background:none;
  color:var(--text-muted);
  font-family:'Rajdhani',sans-serif;
  font-size:0.95rem;
  font-weight:600;
  cursor:pointer;
  letter-spacing:0.05em;
  border-bottom:2px solid transparent;
  margin-bottom:-1px;
  transition:all 0.2s;
}
.tab.active { color:var(--cyan-light); border-bottom-color:var(--cyan); }
.tab-content { display:none; }
.tab-content.active { display:block; }

/* TABLE */
.data-table { width:100%; border-collapse:collapse; }
.data-table th {
  font-family:'Orbitron',monospace;
  font-size:0.7rem;
  color:var(--violet-light);
  text-transform:uppercase;
  letter-spacing:0.1em;
  padding:10px 14px;
  text-align:left;
  border-bottom:1px solid var(--border);
}
.data-table td {
  padding:10px 14px;
  border-bottom:1px solid rgba(255,255,255,0.04);
  color:var(--text-dim);
  font-size:0.9rem;
}
.data-table tr:hover td { background:rgba(255,255,255,0.02); }

/* RANGE INPUT */
input[type=range] {
  -webkit-appearance:none;
  width:100%;
  height:6px;
  border-radius:3px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  outline:none;
  padding:0;
  border:none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance:none;
  width:18px; height:18px;
  border-radius:50%;
  background:white;
  cursor:pointer;
  box-shadow:0 0 8px rgba(124,58,237,0.5);
}

/* METRONOME */
.metro-beat {
  display:flex;
  gap:8px;
  margin-top:16px;
}
.metro-dot {
  width:20px; height:20px;
  border-radius:50%;
  background:var(--bg);
  border:2px solid var(--border);
  transition:all 0.1s;
}
.metro-dot.beat { background:var(--cyan); border-color:var(--cyan); box-shadow:var(--glow-c); }
.metro-dot.accent { background:var(--rose); border-color:var(--rose); box-shadow:var(--glow-r); }

/* WAVEFORM */
canvas.waveform {
  width:100%;
  height:80px;
  border-radius:8px;
  background:var(--bg);
}

/* RESPONSIVE */
@media (max-width:900px) {
  .sidebar { width:60px; }
  .sidebar-logo, .nav-section, .nav-item span { display:none; }
  .main { margin-left:60px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns:1fr; }
  .page { padding:20px; }
}

/* TOOLTIP */
[data-tip] { position:relative; }
[data-tip]:hover::after {
  content:attr(data-tip);
  position:absolute;
  bottom:calc(100% + 8px);
  left:50%;
  transform:translateX(-50%);
  background:#1e1e30;
  border:1px solid var(--border);
  color:var(--text);
  padding:6px 12px;
  border-radius:6px;
  font-size:0.8rem;
  white-space:nowrap;
  z-index:999;
}

/* CHORD SUGGESTION CARD */
.suggestion-card {
  background:var(--card);
  border:1px solid rgba(6,182,212,0.2);
  border-radius:10px;
  padding:16px;
  cursor:pointer;
  transition:all 0.25s;
  position:relative;
}
.suggestion-card:hover {
  border-color:var(--cyan);
  box-shadow:var(--glow-c);
  transform:translateY(-3px);
}
.suggestion-card .why {
  font-size:0.78rem;
  color:var(--text-muted);
  margin-top:6px;
  line-height:1.4;
}
.suggestion-card .tension {
  position:absolute;
  top:10px; right:10px;
  font-size:0.65rem;
  font-family:'Orbitron',monospace;
}

/* STATS BOX */
.stat-box {
  text-align:center;
  padding:20px;
  background:var(--card);
  border-radius:10px;
  border:1px solid var(--border);
}
.stat-box .val {
  font-family:'Orbitron',monospace;
  font-size:2rem;
  font-weight:900;
  color:var(--cyan-light);
}
.stat-box .lbl {
  font-size:0.78rem;
  color:var(--text-muted);
  text-transform:uppercase;
  letter-spacing:0.1em;
  margin-top:4px;
}

/* FREQ DISPLAY */
.freq-display {
  font-family:'Share Tech Mono',monospace;
  font-size:0.85rem;
  color:var(--green);
}

/* NOTIFICATION */
.notif {
  position:fixed;
  bottom:20px; right:20px;
  background:var(--card2);
  border:1px solid var(--cyan);
  border-radius:8px;
  padding:12px 20px;
  color:var(--text);
  font-size:0.9rem;
  z-index:999;
  animation:slideIn 0.3s ease;
  box-shadow:var(--glow-c);
}
@keyframes slideIn { from {opacity:0;transform:translateX(20px)} to {opacity:1;transform:translateX(0)} }