:root {
  --sfc-primary:#2563EB;
  --sfc-text:#172033;
  --sfc-muted:#667085;
  --sfc-success:#15803D;
  --sfc-warning:#D97706;
  --sfc-error:#DC2626;
  --sfc-bg:#F8FAFC;
  --sfc-card:#FFFFFF;
  --sfc-border:#DCE3EE;
  --sfc-shadow:0 12px 30px rgba(16,24,40,.08);
}

.sfc-app,
.sfc-app * { box-sizing:border-box; }

.sfc-app {
  max-width:1050px;
  margin:0 auto;
  padding:24px;
  color:var(--sfc-text);
  background:var(--sfc-bg);
  border:1px solid var(--sfc-border);
  border-radius:24px;
  font-family:inherit;
}

.sfc-header {
  display:flex;
  justify-content:space-between;
  gap:16px;
  align-items:flex-start;
  margin-bottom:18px;
}

.sfc-title {
  margin:0 0 6px;
  font-size:clamp(28px,4vw,40px);
  line-height:1.15;
}

.sfc-subtitle {
  margin:0;
  max-width:720px;
  color:var(--sfc-muted);
  line-height:1.6;
}

.sfc-chip {
  padding:8px 12px;
  border-radius:999px;
  background:#E8F0FF;
  color:#174EA6;
  font-size:13px;
  font-weight:800;
  white-space:nowrap;
}

.sfc-mode-tabs {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  padding:6px;
  margin-bottom:18px;
  border:1px solid var(--sfc-border);
  border-radius:14px;
  background:#fff;
}

.sfc-mode {
  min-height:46px;
  border:0;
  border-radius:10px;
  background:transparent;
  color:var(--sfc-text);
  font-size:15px;
  font-weight:800;
  cursor:pointer;
}

.sfc-mode.is-active {
  background:var(--sfc-primary);
  color:#fff;
}

.sfc-layout,
.sfc-secondary-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}

.sfc-panel {
  background:#fff;
  border:1px solid var(--sfc-border);
  border-radius:18px;
  padding:20px;
  box-shadow:var(--sfc-shadow);
}

.sfc-panel h3 {
  margin:0 0 16px;
  font-size:18px;
}

.sfc-grid {
  display:grid;
  gap:14px;
}

.sfc-grid-2 { grid-template-columns:1fr 1fr; }

.sfc-field {
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-bottom:14px;
  font-size:14px;
  font-weight:800;
}

.sfc-field small {
  color:var(--sfc-muted);
  font-weight:600;
}

.sfc-field input[type="number"],
.sfc-field select {
  width:100%;
  min-height:48px;
  padding:0 14px;
  border:1px solid var(--sfc-border);
  border-radius:12px;
  background:#fff;
  color:var(--sfc-text);
  font-size:16px;
}

.sfc-field input[type="range"] {
  width:100%;
  min-height:28px;
  accent-color:var(--sfc-primary);
}

.sfc-field input:focus,
.sfc-field select:focus,
.sfc-btn:focus,
.sfc-mode:focus,
.sfc-presets button:focus {
  outline:3px solid rgba(37,99,235,.22);
  outline-offset:2px;
}

.sfc-presets {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:8px;
  margin-top:4px;
}

.sfc-presets button {
  min-height:44px;
  padding:0 10px;
  border:1px solid var(--sfc-border);
  border-radius:10px;
  background:#fff;
  color:var(--sfc-text);
  font-weight:800;
  cursor:pointer;
}

.sfc-presets button:hover { border-color:var(--sfc-primary); }

.sfc-live {
  margin-top:14px;
  padding:12px 14px;
  border-radius:12px;
  background:#EEF4FF;
  color:#344054;
  line-height:1.5;
}

.sfc-results-panel { display:flex; flex-direction:column; gap:14px; }

.sfc-primary-result {
  padding:18px;
  border:1px solid #B8CCFF;
  border-radius:16px;
  background:#F7FAFF;
}

.sfc-primary-result span,
.sfc-result-card span,
.sfc-category span,
.sfc-octaves span {
  display:block;
  color:var(--sfc-muted);
  font-size:12px;
  font-weight:800;
}

.sfc-primary-result strong {
  display:block;
  margin:5px 0;
  font-size:34px;
}

.sfc-primary-result small,
.sfc-result-card small,
.sfc-category small {
  color:var(--sfc-muted);
  line-height:1.5;
}

.sfc-results-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}

.sfc-result-card,
.sfc-category {
  padding:14px;
  border:1px solid var(--sfc-border);
  border-radius:14px;
  background:#fff;
}

.sfc-result-card strong,
.sfc-category strong {
  display:block;
  margin:5px 0;
  font-size:21px;
}

.sfc-octaves {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:8px;
}

.sfc-octaves div {
  padding:12px;
  border-radius:12px;
  background:#F8FAFC;
  text-align:center;
}

.sfc-octaves strong {
  display:block;
  margin-top:4px;
  font-size:17px;
}

.sfc-secondary-grid { margin-top:18px; }

.sfc-panel-head {
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:flex-start;
}

.sfc-panel-head h3 { margin-bottom:4px; }
.sfc-panel-head p {
  margin:0 0 12px;
  color:var(--sfc-muted);
  font-size:14px;
  line-height:1.5;
}

.sfc-actions {
  display:flex;
  gap:10px;
  margin-top:14px;
}

.sfc-actions-wrap { flex-wrap:wrap; }

.sfc-btn {
  min-height:48px;
  padding:0 16px;
  border:1px solid var(--sfc-border);
  border-radius:12px;
  background:#fff;
  color:var(--sfc-text);
  font-size:16px;
  font-weight:800;
  cursor:pointer;
  transition:transform .16s ease,border-color .16s ease;
}

.sfc-btn:hover { transform:translateY(-1px); border-color:#AAB8CC; }
.sfc-btn-primary { background:var(--sfc-primary); color:#fff; border-color:var(--sfc-primary); }
.sfc-btn-danger { color:#B42318; }

.sfc-small-note {
  margin:12px 0 0;
  color:var(--sfc-muted);
  font-size:13px;
  line-height:1.5;
}

.sfc-history {
  min-height:120px;
  max-height:230px;
  overflow:auto;
  margin-top:12px;
}

.sfc-history-item {
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:10px 0;
  border-bottom:1px solid #EEF1F5;
  font-size:14px;
}

.sfc-history-item strong { white-space:nowrap; }
.sfc-empty { color:var(--sfc-muted); }

.sfc-notes {
  display:grid;
  gap:8px;
  margin-top:18px;
  padding:16px;
  border:1px solid var(--sfc-border);
  border-radius:14px;
  background:#fff;
  color:#475467;
  line-height:1.55;
  font-size:14px;
}

@media (max-width:900px) {
  .sfc-layout,
  .sfc-secondary-grid { grid-template-columns:1fr; }
}

@media (max-width:640px) {
  .sfc-app { padding:14px; border-radius:18px; }
  .sfc-header { flex-direction:column; }
  .sfc-grid-2,
  .sfc-results-grid,
  .sfc-mode-tabs,
  .sfc-octaves { grid-template-columns:1fr; }
  .sfc-presets { grid-template-columns:1fr 1fr; }
  .sfc-actions { flex-direction:column; }
  .sfc-actions .sfc-btn { width:100%; }
}