/* =========================================================
   Real-Time Score Following — Modern UI
   ========================================================= */

:root {
  /* Color tokens */
  --bg-app: #f5f6fa;
  --bg-app-2: #eef0f7;
  --surface: #ffffff;
  --surface-soft: #f8f9fc;
  --surface-soft-2: #f1f3f9;
  --border: #e6e8ef;
  --border-strong: #d6d9e3;

  --text: #1f2330;
  --text-muted: #5b6273;
  --text-soft: #8a91a3;

  --brand: #4f46e5;
  --brand-2: #7c3aed;
  --brand-soft: #eef0ff;

  --success: #10b981;
  --success-soft: #ecfdf5;
  --warning: #f59e0b;
  --warning-soft: #fffaeb;
  --danger: #ef4444;
  --danger-soft: #fef2f2;
  --info: #0ea5e9;
  --info-soft: #f0f9ff;

  /* Shape & motion */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(20, 24, 40, 0.05);
  --shadow: 0 6px 24px rgba(20, 24, 40, 0.06);
  --shadow-lg: 0 16px 40px rgba(20, 24, 40, 0.1);
  --transition: 0.2s ease;
}

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

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  background:
    radial-gradient(1200px 600px at 0% -10%, rgba(124, 58, 237, 0.08), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(79, 70, 229, 0.08), transparent 60%),
    var(--bg-app);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1280px; margin: 0 auto; padding: 28px 24px 60px; }

/* ---------- Header ---------- */
.header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  margin-bottom: 28px;
  color: var(--text);
}
.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.header p { font-size: 0.95rem; color: var(--text-muted); }

/* ---------- Layout ---------- */
.main-grid {
  display: grid;
  grid-template-columns: minmax(320px, 380px) 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 900px) { .main-grid { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.control-panel,
.display-area {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow);
}

.section { margin-bottom: 22px; }
.section:last-child { margin-bottom: 0; }
.section h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.01em;
}
.section h4 { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }

/* ---------- Form controls ---------- */
.device-selector,
.search-input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.device-selector:focus,
.search-input:focus {
  border-color: var(--brand);
  outline: none;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* ---------- Audio level + status ---------- */
.level-container {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin: 12px 0;
}
.level-meter-container {
  background: var(--surface-soft-2);
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  margin: 4px 0 10px;
  position: relative;
}
.level-meter {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  transition: width 0.08s linear, background 0.2s ease;
  background: var(--text-soft);
}
.level-meter.low    { background: linear-gradient(90deg, #94a3b8, #64748b); }
.level-meter.ok     { background: linear-gradient(90deg, #fbbf24, #f59e0b); }
.level-meter.good   { background: linear-gradient(90deg, #34d399, #10b981); }
.level-meter.high   { background: linear-gradient(90deg, #f97316, #ef4444); }

.level-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}
#level-text {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

/* Status indicator pills */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 10px;
  background: var(--surface-soft-2);
  color: var(--text-muted);
}
.status-indicator::before {
  content: '';
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-soft);
}
.status-music      { background: var(--success-soft); color: #047857; }
.status-music::before { background: var(--success); animation: pulse-dot 1.4s infinite; }
.status-weak       { background: var(--warning-soft); color: #92400e; }
.status-weak::before { background: var(--warning); }
.status-background { background: var(--info-soft); color: #075985; }
.status-background::before { background: var(--info); }
.status-silent     { background: var(--surface-soft-2); color: var(--text-muted); }
.status-silent::before { background: var(--text-soft); }

/* Level history chart */
#level-chart {
  width: 100%;
  height: 80px;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  margin-top: 10px;
  display: block;
}

/* ---------- Buttons ---------- */
.button-group { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.button-group .btn-primary,
.button-group .btn-secondary { grid-column: span 1; }
.button-group .btn-recording,
.button-group .btn-export { grid-column: span 1; }
.button-group .btn-danger { grid-column: 1 / -1; }

.btn {
  padding: 11px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--surface-soft);
  color: var(--text);
}
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 6px 18px rgba(79, 70, 229, 0.25); }
.btn-primary:hover:not(:disabled) { background: #4338ca; }

.btn-secondary { background: var(--surface-soft-2); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover:not(:disabled) { background: var(--surface-soft); }

.btn-recording { background: var(--danger-soft); color: var(--danger); border-color: rgba(239, 68, 68, 0.25); }
.btn-recording:hover:not(:disabled) { background: var(--danger); color: #fff; }
.btn-recording.active { background: var(--danger); color: #fff; animation: pulse-record 1.6s infinite; }

.btn-export { background: var(--brand-soft); color: var(--brand); border-color: rgba(79, 70, 229, 0.2); }
.btn-export:hover:not(:disabled) { background: var(--brand); color: #fff; }

.btn-danger { background: transparent; color: var(--text-muted); border-color: var(--border-strong); }
.btn-danger:hover:not(:disabled) { color: var(--danger); border-color: var(--danger); }

@keyframes pulse-record {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.45); }
  50%      { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
}

/* ---------- Recording status ---------- */
.recording-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  font-size: 0.85rem;
}
.recording-indicator { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.recording-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--danger);
  animation: pulse-dot 1s infinite;
}
.recording-duration { font-variant-numeric: tabular-nums; opacity: 0.85; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* ---------- Collapsible sections ---------- */
.section-header {
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  transition: color var(--transition);
}
.section-header:hover { color: var(--brand); }
.collapse-icon {
  display: inline-block;
  width: 14px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-soft);
  transition: transform var(--transition);
}
.collapsible-content { transition: all 0.3s ease; overflow: hidden; }
.collapsible-content.collapsed { display: none; }

/* ---------- Instrument grid ---------- */
.instrument-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin: 8px 0 12px;
}
.instrument-item {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  background: var(--surface-soft);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text);
}
.instrument-item:hover { background: var(--surface-soft-2); }
.instrument-item input[type="checkbox"] {
  margin-right: 8px;
  accent-color: var(--brand);
  width: 14px; height: 14px;
}
.instrument-item:has(input:checked),
.instrument-item.selected { background: var(--brand-soft); border-color: rgba(79, 70, 229, 0.3); color: var(--brand); }

/* ---------- Score upload ---------- */
.score-container {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  min-height: auto;
  display: block;
  text-align: left;
}
.score-upload-area {
  background: var(--surface-soft);
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: all var(--transition);
}
.score-upload-area:hover { border-color: var(--brand); background: var(--brand-soft); color: var(--brand); }
.score-upload-area input[type="file"] { margin-top: 14px; }

/* ---------- Visualization grid + Score Position panel ---------- */
.visualization-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.viz-panel {
  background: var(--surface-soft);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
}
.viz-panel h4 {
  margin-bottom: 10px;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}
.viz-panel p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Score position display */
.score-status { padding: 4px 0; }
.score-status .empty {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.score-status.following .position-hero {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--success);
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.score-status.following .position-hero small {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.score-status .stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}
.score-status .stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}
.score-status .stat .label {
  font-size: 0.7rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.score-status .stat .value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.score-status .progress-bar {
  margin-top: 10px;
  background: var(--surface-soft-2);
  height: 6px;
  border-radius: 999px;
  overflow: hidden;
}
.score-status .progress-bar > div {
  height: 100%;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: width 0.2s ease;
}
.score-status .feedback {
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.score-status.waiting .feedback { color: var(--warning); }

/* Performance metrics */
#performance-metrics { display: grid; gap: 8px; }
#performance-metrics > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.85rem;
  color: var(--text-muted);
}
#performance-metrics span {
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ---------- Loaded score ---------- */
.score-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--brand-soft);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.score-header h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}
.score-header .btn-remove-score {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition);
}
.score-header .btn-remove-score:hover { color: var(--danger); border-color: var(--danger); }

.tracks-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.tracks-table th {
  background: var(--surface-soft);
  padding: 10px;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.tracks-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.tracks-table tr:last-child td { border-bottom: none; }

.score-controls {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--success-soft);
  color: #047857;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
}

/* ---------- Search ---------- */
.search-form { display: flex; gap: 8px; margin-bottom: 10px; }
.search-form .btn { padding: 10px 16px; }
.search-results {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.search-result-item {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--surface-soft); }
.result-title { font-weight: 600; color: var(--text); margin-bottom: 2px; font-size: 0.9rem; }
.result-composer { color: var(--text-muted); font-size: 0.8rem; }
.result-source { color: var(--text-soft); font-size: 0.75rem; margin-top: 2px; }

/* ---------- Connection status pill ---------- */
.connection-status {
  position: fixed;
  top: 16px;
  right: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.connection-status::before {
  content: '';
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-soft);
}
.connected    { color: #047857; }
.connected::before    { background: var(--success); box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18); }
.disconnected { color: var(--danger); }
.disconnected::before { background: var(--danger); }

/* ---------- Score plot ---------- */
#score-plot {
  width: 100%;
  height: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-top: 12px;
}

/* ---------- Notifications ---------- */
.toast {
  position: fixed;
  top: 70px;
  right: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  z-index: 1001;
  max-width: 320px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  color: var(--text);
  animation: toast-in 0.25s ease;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.info    { border-left: 3px solid var(--info); }
@keyframes toast-in {
  from { transform: translateY(-8px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* ---------- Spinner ---------- */
.spinner {
  border: 2px solid var(--surface-soft-2);
  border-top: 2px solid var(--brand);
  border-radius: 50%;
  width: 18px; height: 18px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .container { padding: 18px 14px 40px; }
  .header h1 { font-size: 1.4rem; }
  .button-group { grid-template-columns: 1fr; }
  .button-group .btn-primary,
  .button-group .btn-secondary,
  .button-group .btn-recording,
  .button-group .btn-export,
  .button-group .btn-danger { grid-column: 1 / -1; }
  .instrument-grid { grid-template-columns: 1fr; }
}

/* iPad-friendly tap targets */
@media (hover: none) and (pointer: coarse) {
  .btn, .device-selector, .search-input { min-height: 44px; }
  .instrument-item { min-height: 40px; }
}