/* ====== Header / Nav ====== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(2,6,23,.06);
  transition: box-shadow .2s ease;
}
.site-header.scrolled { box-shadow: var(--shadow); }

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-badge {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--blue); color: var(--white);
  font-family: Rajdhani, sans-serif; font-weight: 700; letter-spacing: .5px;
}
.brand-text { color: var(--text); font-weight: 700; }

.nav { display: flex; gap: 22px; align-items: center; }
.nav a {
  text-decoration: none; color: var(--text); padding: 10px 6px;
  border-radius: 10px; transition: background .15s ease, color .15s ease;
  font-weight: 600;
}
.nav-close { display: none; }
.nav a:hover { background: var(--gray-200); }
.nav a.active {
  background: rgba(11, 77, 148, 0.15);
  color: var(--blue);
  font-weight: 700;
}

.nav-toggle {
  display: none; border: 0; background: transparent; cursor: pointer;
  width: 42px; height: 42px; border-radius: 10px; padding: 10px;
}
.nav-toggle .bar {
  display: block; height: 2px; background: var(--text); margin: 6px 0; width: 100%;
}