/* Basic header layout */
/* .site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: #fff;
  border-bottom: 1px solid #e6e9ef;
  position: relative;
  z-index: 50;
} */

/* brand */
/* .brand { font-weight:700; font-size:1.05rem; color:#111; text-decoration:none; } */

/* Desktop nav */
.top-nav .nav-list {
  display:flex;
  gap:14px;
  align-items:center;
  list-style:none;
  margin:0; padding:0;
}
/* .top-nav a, .top-nav .btn { text-decoration:none; color:#111; font-weight:500; padding:8px 10px; border-radius:8px; } */
/* .top-nav .btn { background:#2563eb; color:#fff; border:0; cursor:pointer; } */

/* Hamburger (mobile toggle) */
.nav-toggle {
  display:none; /* shown on mobile via media query */
  background:transparent;
  border:0;
  width:44px; height:44px;
  padding:8px;
  border-radius:8px;
  cursor:pointer;
}
.nav-toggle:focus { outline: 3px solid rgba(37,99,235,0.18); outline-offset:2px; }

/* hamburger icon lines */
.hamburger {
  display:inline-block;
  width:22px; height:2px;
  background:#111;
  position:relative;
  transition: transform .25s ease;
}
.hamburger::before, .hamburger::after {
  content:"";
  position:absolute;
  left:0; right:0;
  height:2px; background:#111;
  transition: transform .25s ease, top .25s ease, opacity .25s ease;
}
.hamburger::before { top:-7px; }
.hamburger::after  { top:7px; }

/* when open - animate into X */
.nav-toggle[aria-expanded="true"] .hamburger { background:transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after  { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav (hidden by default, revealed with transition) */
.mobile-nav {
  position: absolute;
  top:100%;
  left:0;
  right:0;
  background: #fff;
  border-bottom: 1px solid #e6e9ef;
  box-shadow: 0 12px 40px rgba(10,20,40,0.08);
  overflow: hidden;
  will-change: max-height, opacity;
}

/* Hidden state: collapsed */
.mobile-nav[hidden] {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
}

/* Visible state: expand */
.mobile-nav.open {
  max-height: 100vh; /* big enough to show all links */
  opacity: 1;
  pointer-events: auto;
  transition: max-height .45s cubic-bezier(.22,.9,.23,1), opacity .25s ease;
}

/* mobile list */
.mobile-list {
  list-style:none; margin:0; padding:12px 16px; display:flex; flex-direction:column; gap:6px;
}
.mobile-list a, .mobile-list .btn {
  display:block;
  padding:12px 14px;
  border-radius:8px;
  text-decoration:none;
  color:#111;
  font-weight:600;
}
.mobile-list a:hover, .mobile-list .btn:hover { background: #f1f5f9; }

/* Responsive breakpoints */
@media (max-width: 880px) {
  .top-nav { display:none; }         /* hide desktop nav on small screens */
  .nav-toggle { display:inline-flex; align-items:center; justify-content:center; } /* show hamburger */
  /* ensure mobile nav shows under header */
  .mobile-nav { left:0; right:0; }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .mobile-nav.open { transition: none; }
  .nav-toggle .hamburger, .nav-toggle .hamburger::before, .nav-toggle .hamburger::after { transition: none; }
}