:root {
  --color-bg: #ffffff;
  --color-ink: #1f2937;
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-accent: #22c55e;
  --color-muted: #4b5563;
  --color-border: #e2e8f0;
  --color-panel: #f1f5f9;
}

@keyframes fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes grow {
  from { transform: scale(0.96); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.animate-fade { animation: fade 0.6s ease-in-out; }
.animate-grow { animation: grow 0.8s ease-out; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #f1f5f9; }
::-webkit-scrollbar-thumb { background: #3b82f6; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #2563eb; }

.burger-menu {
  transform: translateX(100%);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.burger-menu.active {
  transform: translateX(0) !important;
  opacity: 1;
}
header nav .burger-button .burger-icon { transition: transform 0.3s ease, opacity 0.3s ease; }
header nav .burger-button.active .burger-icon:nth-child(1) { transform: translateY(6px) rotate(45deg); }
header nav .burger-button.active .burger-icon:nth-child(2) { opacity: 0; }
header nav .burger-button.active .burger-icon:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-link-active { position: relative; }
.nav-link-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  border-radius: 999px;
  background: #22c55e;
}

.faq-question { cursor: pointer; user-select: none; }
.faq-question:hover { color: #2563eb !important; }
.faq-question.active { color: #3b82f6 !important; }
.faq-question::after { content: '+'; float: right; font-size: 1.5em; font-weight: bold; transition: transform 0.3s ease; }
.faq-question.active::after { content: '−'; transform: rotate(180deg); }
.faq-answer { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--color-border); }