.fullscreen-menu {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background-color: var(--surface); z-index: 9999;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  opacity: 0; pointer-events: none; transition: all 0.3s ease;
  transform: translateY(-10px); overflow-x: hidden;
}
.fullscreen-menu.active { opacity: 1; pointer-events: auto; transform: translateY(0); }
.fullscreen-menu .close-btn { position: absolute; top: 1.5rem; right: 1.5rem; font-size: 2.5rem; color: var(--text); background: none; border: none; cursor: pointer; z-index: 1; }
.overlay-nav { display: flex; flex-direction: column; gap: 0.75rem; text-align: left; width: 92%; max-width: 480px; max-height: 80vh; overflow-y: auto; overflow-x: hidden; padding: 1rem 0; }
.overlay-nav .nav-link {
  font-size: 0.95rem; font-weight: bold; color: var(--text); text-decoration: none;
  padding: 0.7rem 0.85rem; border-radius: var(--radius-sm); transition: all 0.2s ease;
  display: flex; align-items: center; justify-content: flex-start; gap: 0.75rem;
  border: 2px solid var(--border); background-color: var(--bg); box-sizing: border-box; width: 100%;
  cursor: pointer; font-family: var(--font);
}
.overlay-nav .nav-link i { flex-shrink: 0; width: 1.2rem; text-align: center; }
.overlay-nav .nav-link:hover, .overlay-nav .nav-link.active {
  background-color: var(--accent); color: white; border-color: var(--accent);
}
.panel { display: none; animation: fade .15s ease; }
.panel.active { display: block; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.result-row-item {
  display: flex;
  justify-content: space-between;
  padding: 9px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 13.5px;
}
.result-row-item:last-child { border-bottom: none; }
.result-row-item .val { font-weight: 700; color: var(--accent); }
.result-row-item .val.danger { color: #dc2626; }
.result-row-item .val.warning { color: #d97706; }
.result-row-item .val.ok { color: #16a34a; }
.result-box { margin-top: 0.75rem; }
.help-text { font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; line-height: 1.4; }
.section-title { font-size: 1.1rem; font-weight: 700; margin: 0.5rem 0 0.75rem; color: var(--text); }
.formula-card { background: var(--bg); border-radius: var(--radius-sm); padding: 1rem; border: 1px solid var(--border); margin-bottom: 0.5rem; }
.formula-card h4 { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.5rem; text-transform: uppercase; letter-spacing: .04em; font-weight: 600; }
.formula-card .formula { font-size: 1rem; font-weight: 700; font-family: 'Times New Roman', serif; color: var(--text); line-height: 1.6; }
.formula-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.example-box { background: var(--bg); border-radius: var(--radius-sm); padding: 1rem; border: 1px solid var(--border); font-size: 0.85rem; line-height: 1.7; }
.example-box .example-label { font-weight: 700; color: var(--accent); margin-bottom: 0.5rem; font-size: 0.9rem; }
.example-box .example-data { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; margin-bottom: 0.75rem; font-size: 0.82rem; color: var(--text-secondary); }
.example-box .example-step { margin-bottom: 0.4rem; }
.hidden { display: none !important; }
@media (max-width: 480px) {
  .formula-grid { grid-template-columns: 1fr; }
}