/* K-Vocal — Dark Studio Theme */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface-2: #1a1a24;
  --border: #1e1e2e;
  --border-2: #2a2a3a;
  --primary: #00e5ff;
  --primary-dim: #00a0b8;
  --reference: #ff4da6;
  --reference-dim: #b8357a;
  --accent: #7c3aed;
  --accent-dim: #5b21b6;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --muted: #64748b;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-ui: 'Inter', system-ui, sans-serif;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-glow-cyan: 0 0 20px rgba(0, 229, 255, 0.3);
  --shadow-glow-pink: 0 0 20px rgba(255, 77, 166, 0.3);
  --shadow-glow-violet: 0 0 20px rgba(124, 58, 237, 0.4);
  --shadow-glow-success: 0 0 20px rgba(34, 197, 94, 0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body { font-family: var(--font-ui); background: var(--bg); color: var(--text); min-height: 100vh; overflow-x: hidden; -webkit-font-smoothing: antialiased; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* Typography */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.1rem; }
.mono { font-family: var(--font-mono); }

/* Layout */
.app-shell { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }
.page { padding: 1.5rem 0 4rem; }

/* Header */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0; border-bottom: 1px solid var(--border); gap: 1rem;
}
.header-brand { display: flex; align-items: center; gap: 0.5rem; }
.header-brand .logo {
  font-family: var(--font-mono); font-size: 1.4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  letter-spacing: -0.5px;
}
.header-nav { display: flex; align-items: center; gap: 0.5rem; }
.nav-link {
  display: flex; align-items: center; gap: 0.4rem; padding: 0.45rem 0.85rem;
  border-radius: var(--radius); color: var(--text-dim); text-decoration: none;
  font-size: 0.875rem; font-weight: 500; transition: all 0.15s; border: 1px solid transparent;
}
.nav-link:hover { color: var(--text); background: var(--surface); border-color: var(--border); }
.nav-link.active { color: var(--primary); background: rgba(0,229,255,0.08); border-color: rgba(0,229,255,0.2); }
.nav-icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius); border: 1px solid var(--border);
  background: transparent; color: var(--text-dim); cursor: pointer; transition: all 0.15s; text-decoration: none;
}
.nav-icon-btn:hover { color: var(--text); background: var(--surface); border-color: var(--border-2); }
.nav-icon-btn.active { color: var(--accent); border-color: var(--accent); background: rgba(124,58,237,0.1); }

/* Now Playing Bar */
.now-playing { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem 1.25rem; margin: 1rem 0; }
.now-playing-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }
.now-playing-title { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.now-playing-track { font-family: var(--font-mono); font-size: 1rem; font-weight: 600; color: var(--text); }
.now-playing-time { font-family: var(--font-mono); font-size: 0.875rem; color: var(--text-dim); }

/* Progress Bar */
.progress-container { position: relative; height: 6px; background: var(--border); border-radius: 3px; cursor: pointer; margin-bottom: 0.5rem; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary-dim), var(--primary)); border-radius: 3px; transition: width 0.1s linear; }
.progress-fill::after {
  content: ''; position: absolute; right: -5px; top: -3px; width: 12px; height: 12px;
  background: var(--primary); border-radius: 50%; box-shadow: var(--shadow-glow-cyan); opacity: 0; transition: opacity 0.15s;
}
.progress-container:hover .progress-fill::after { opacity: 1; }

/* Pitch Canvas */
.pitch-canvas-wrap { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin: 1rem 0; }
.pitch-canvas-wrap::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,229,255,0.02) 0%, transparent 50%, rgba(255,77,166,0.02) 100%);
  pointer-events: none;
}
#pitch-canvas { display: block; width: 100%; height: 220px; }
.canvas-overlay { position: absolute; inset: 0; pointer-events: none; display: flex; align-items: flex-end; justify-content: flex-start; padding: 0.75rem; }
.canvas-legend { display: flex; gap: 1rem; background: rgba(10,10,15,0.7); backdrop-filter: blur(8px); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.4rem 0.75rem; }
.legend-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.7rem; font-weight: 500; color: var(--text-dim); }
.legend-dot { width: 8px; height: 8px; border-radius: 50%; }
.legend-dot.cyan { background: var(--primary); box-shadow: var(--shadow-glow-cyan); }
.legend-dot.pink { background: var(--reference); box-shadow: var(--shadow-glow-pink); }
.legend-dot.green { background: var(--success); box-shadow: var(--shadow-glow-success); }

/* Input Level Meter */
.input-section { display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin: 0.75rem 0; flex-wrap: wrap; }
.input-label { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); display: flex; align-items: center; gap: 0.4rem; }
.input-label .mic-icon { color: var(--danger); }
.meter-bar { flex: 1; min-width: 100px; height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.meter-fill { height: 100%; background: linear-gradient(90deg, var(--success), var(--warning), var(--danger)); border-radius: 3px; transition: width 0.05s; }
.input-value { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); min-width: 80px; text-align: right; }
.input-value .hz { color: var(--primary); font-weight: 600; }
.note-badge {
  display: inline-flex; align-items: center; padding: 0.2rem 0.6rem; border-radius: 100px;
  font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
  min-width: 52px; justify-content: center; transition: all 0.1s;
}
.note-badge.in-tune { color: var(--success); border-color: var(--success); background: rgba(34,197,94,0.1); box-shadow: var(--shadow-glow-success); }
.note-badge.sharp { color: var(--warning); border-color: var(--warning); }
.note-badge.flat { color: var(--primary-dim); border-color: var(--primary-dim); }
.note-badge.no-signal { color: var(--muted); border-color: var(--border); }
.tuning-indicator {
  display: flex; align-items: center; gap: 0.3rem; font-family: var(--font-mono);
  font-size: 0.7rem; font-weight: 600; padding: 0.2rem 0.5rem; border-radius: 100px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--muted);
}
.tuning-indicator.in-tune { color: var(--success); border-color: var(--success); background: rgba(34,197,94,0.1); }
.tuning-indicator.sharp { color: var(--warning); border-color: var(--warning); }
.tuning-indicator.flat { color: var(--primary-dim); border-color: var(--primary-dim); }

/* Takes Panel */
.takes-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin: 1rem 0; }
.takes-header { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.takes-title { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); display: flex; align-items: center; gap: 0.4rem; }
.takes-list { list-style: none; }
.take-slot { display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); transition: background 0.1s; }
.take-slot:last-child { border-bottom: none; }
.take-slot:hover { background: rgba(255,255,255,0.02); }
.take-slot.empty { color: var(--muted); font-size: 0.85rem; font-style: italic; }
.take-number { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; color: var(--muted); min-width: 24px; }
.take-info { flex: 1; min-width: 0; }
.take-name { font-size: 0.85rem; font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.take-meta { font-size: 0.7rem; color: var(--muted); font-family: var(--font-mono); display: flex; align-items: center; gap: 0.5rem; }
.take-star { color: var(--warning); cursor: pointer; font-size: 0.85rem; background: none; border: none; padding: 0; line-height: 1; }
.take-actions { display: flex; align-items: center; gap: 0.4rem; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.5rem 1rem; border-radius: var(--radius); font-family: var(--font-ui);
  font-size: 0.875rem; font-weight: 600; border: 1px solid transparent;
  cursor: pointer; transition: all 0.15s; text-decoration: none; white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover:not(:disabled) { background: var(--accent-dim); box-shadow: var(--shadow-glow-violet); }
.btn-secondary { background: var(--surface-2); color: var(--text); border-color: var(--border-2); }
.btn-secondary:hover:not(:disabled) { background: var(--border); border-color: var(--muted); }
.btn-ghost { background: transparent; color: var(--text-dim); border-color: transparent; padding: 0.4rem 0.6rem; }
.btn-ghost:hover:not(:disabled) { color: var(--text); background: var(--surface); }
.btn-danger { background: rgba(239,68,68,0.1); color: var(--danger); border-color: rgba(239,68,68,0.3); }
.btn-danger:hover:not(:disabled) { background: rgba(239,68,68,0.2); }
.btn-icon { width: 32px; height: 32px; padding: 0; border-radius: var(--radius); }
.btn-icon.sm { width: 26px; height: 26px; }

/* Transport Controls */
.transport-row { display: flex; align-items: center; justify-content: center; gap: 0.75rem; padding: 1rem; flex-wrap: wrap; }
.transport-btn {
  width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: 2px solid var(--border-2); color: var(--text);
  cursor: pointer; transition: all 0.15s; font-size: 1.2rem;
}
.transport-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-glow-cyan); transform: scale(1.05); }
.transport-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.transport-btn.play-btn { width: 60px; height: 60px; background: var(--accent); border-color: var(--accent); color: #fff; }
.transport-btn.play-btn:hover:not(:disabled) { background: var(--accent-dim); box-shadow: var(--shadow-glow-violet); transform: scale(1.08); }
.transport-btn.rec-btn { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.4); color: var(--danger); }
.transport-btn.rec-btn:hover:not(:disabled) { background: rgba(239,68,68,0.2); box-shadow: 0 0 20px rgba(239,68,68,0.4); }
.transport-btn.rec-btn.recording { background: var(--danger); border-color: var(--danger); color: #fff; animation: rec-pulse 1s ease-in-out infinite; }
@keyframes rec-pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(239,68,68,0.5); } 50% { box-shadow: 0 0 0 10px rgba(239,68,68,0); } }

/* Volume Slider */
.volume-row { display: flex; align-items: center; gap: 0.75rem; padding: 0.5rem 1rem; justify-content: center; }
.volume-label { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); min-width: 60px; display: flex; align-items: center; gap: 0.4rem; }
.volume-slider { -webkit-appearance: none; appearance: none; flex: 1; max-width: 200px; height: 6px; background: var(--border); border-radius: 3px; outline: none; cursor: pointer; }
.volume-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); cursor: pointer; box-shadow: var(--shadow-glow-violet); transition: transform 0.1s; }
.volume-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.volume-slider::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--accent); cursor: pointer; border: none; box-shadow: var(--shadow-glow-violet); }
.volume-value { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); min-width: 36px; text-align: right; }

/* Song Cards */
.songs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-top: 1rem; }
.song-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1rem; cursor: pointer; transition: all 0.2s; position: relative; overflow: hidden;
}
.song-card::before {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0,229,255,0.05), rgba(124,58,237,0.05)); opacity: 0; transition: opacity 0.2s;
}
.song-card:hover { border-color: var(--primary); box-shadow: var(--shadow-glow-cyan); transform: translateY(-2px); }
.song-card:hover::before { opacity: 1; }
.song-card.playing { border-color: var(--accent); box-shadow: var(--shadow-glow-violet); }
.song-card.playing::after {
  content: ''; position: absolute; inset: -2px; border-radius: calc(var(--radius-lg) + 2px);
  border: 2px solid var(--accent); animation: playing-border 2s linear infinite; pointer-events: none;
}
@keyframes playing-border { 0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; } }
.song-card-waveform { height: 40px; background: var(--surface-2); border-radius: var(--radius); margin-bottom: 0.75rem; overflow: hidden; display: flex; align-items: center; padding: 0 0.5rem; gap: 2px; }
.waveform-bar { flex: 1; background: var(--primary-dim); border-radius: 1px; min-height: 2px; max-height: 100%; transition: height 0.1s; }
.song-card-title { font-weight: 600; font-size: 0.95rem; color: var(--text); margin-bottom: 0.2rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.song-card-artist { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.5rem; }
.song-card-meta { display: flex; align-items: center; justify-content: space-between; font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim); }
.song-card-play-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.2s; background: rgba(10,10,15,0.4); }
.song-card:hover .song-card-play-overlay { opacity: 1; }

/* Settings */
.settings-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1rem; }
.settings-section h3 { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 1rem; display: flex; align-items: center; gap: 0.4rem; }
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: 0.6rem 0; border-bottom: 1px solid var(--border); gap: 1rem; }
.setting-row:last-child { border-bottom: none; }
.setting-label { font-size: 0.875rem; color: var(--text); }
.setting-desc { font-size: 0.75rem; color: var(--muted); margin-top: 0.15rem; }
.setting-control { display: flex; align-items: center; gap: 0.5rem; }
select { background: var(--surface-2); border: 1px solid var(--border-2); border-radius: var(--radius); color: var(--text); padding: 0.4rem 0.75rem; font-family: var(--font-ui); font-size: 0.875rem; cursor: pointer; outline: none; transition: border-color 0.15s; }
select:focus { border-color: var(--accent); }
input[type="range"] { -webkit-appearance: none; appearance: none; height: 6px; background: var(--border); border-radius: 3px; outline: none; cursor: pointer; width: 140px; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; }
input[type="number"] { background: var(--surface-2); border: 1px solid var(--border-2); border-radius: var(--radius); color: var(--text); padding: 0.35rem 0.6rem; font-family: var(--font-mono); font-size: 0.875rem; width: 80px; text-align: center; outline: none; transition: border-color 0.15s; }
input[type="number"]:focus { border-color: var(--accent); }

/* Add Song Form */
.add-song-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); padding-bottom: 0; }
.add-song-tab { padding: 0.5rem 1rem; background: transparent; border: none; border-bottom: 2px solid transparent; color: var(--muted); font-family: var(--font-ui); font-size: 0.875rem; font-weight: 500; cursor: pointer; transition: all 0.15s; margin-bottom: -1px; }
.add-song-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.add-song-form { display: none; gap: 0.75rem; align-items: flex-end; flex-wrap: wrap; }
.add-song-form.active { display: flex; }
.url-input-wrap { flex: 1; min-width: 240px; }
.url-input-wrap label { display: block; font-size: 0.75rem; color: var(--muted); margin-bottom: 0.3rem; }
input[type="url"], input[type="text"] { width: 100%; background: var(--surface-2); border: 1px solid var(--border-2); border-radius: var(--radius); color: var(--text); padding: 0.5rem 0.75rem; font-family: var(--font-ui); font-size: 0.875rem; outline: none; transition: border-color 0.15s; }
input[type="url"]:focus, input[type="text"]:focus { border-color: var(--accent); }
.file-drop { border: 2px dashed var(--border-2); border-radius: var(--radius-lg); padding: 2rem; text-align: center; cursor: pointer; transition: all 0.15s; color: var(--muted); font-size: 0.875rem; }
.file-drop:hover, .file-drop.drag-over { border-color: var(--accent); color: var(--text); background: rgba(124,58,237,0.05); }
.file-drop input[type="file"] { display: none; }

/* Empty States */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--muted); }
.empty-state-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }
.empty-state h3 { font-size: 1rem; color: var(--text-dim); margin-bottom: 0.5rem; }
.empty-state p { font-size: 0.875rem; }

/* Loading */
.loading-spinner { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--muted); font-size: 0.875rem; }
.spinner { width: 18px; height: 18px; border: 2px solid var(--border-2); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Toast Notifications */
.toast-container { position: fixed; bottom: 1.5rem; right: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; z-index: 1000; }
.toast { display: flex; align-items: center; gap: 0.6rem; padding: 0.75rem 1rem; background: var(--surface-2); border: 1px solid var(--border-2); border-radius: var(--radius); font-size: 0.875rem; box-shadow: 0 4px 20px rgba(0,0,0,0.4); animation: toast-in 0.3s ease; max-width: 320px; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }
.toast.warning { border-color: var(--warning); color: var(--warning); }
@keyframes toast-in { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Responsive */
@media (max-width: 640px) {
  .header { flex-wrap: wrap; }
  .songs-grid { grid-template-columns: 1fr; }
  .transport-btn { width: 44px; height: 44px; }
  .transport-btn.play-btn { width: 52px; height: 52px; }
  .now-playing { padding: 0.75rem 1rem; }
  .takes-panel { margin: 0.75rem 0; }
  .input-section { flex-wrap: wrap; }
  .settings-section { padding: 1rem; }
}

/* Glow utilities */
.glow-cyan { box-shadow: var(--shadow-glow-cyan); }
.glow-pink { box-shadow: var(--shadow-glow-pink); }
.glow-violet { box-shadow: var(--shadow-glow-violet); }
.glow-success { box-shadow: var(--shadow-glow-success); }

/* Divider */
.divider { height: 1px; background: var(--border); margin: 1rem 0; }

/* Badge */
.badge { display: inline-flex; align-items: center; padding: 0.15rem 0.5rem; border-radius: 100px; font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.badge-primary { background: rgba(0,229,255,0.15); color: var(--primary); }
.badge-accent { background: rgba(124,58,237,0.15); color: var(--accent); }
.badge-success { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-danger { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-muted { background: var(--surface-2); color: var(--muted); }