.av-header{position:sticky;top:0;z-index:40;background:rgba(240,244,248,0.95);backdrop-filter:blur(18px);border-bottom:1px solid rgba(148,163,184,0.35)}
.av-header__inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);padding:var(--space-3) 0}
.av-header__brand{display:flex;align-items:center;gap:var(--space-3);color:var(--color-text)}
.av-header__logo-mark{width:40px;height:40px;border-radius:20px;background:radial-gradient(circle at 0 0,#E0F2FE 0,#06B6D4 55%,#0B1120 100%);box-shadow:var(--shadow-elevated)}
.av-header__brand-text{display:flex;flex-direction:column;gap:0.1rem}
.av-header__brand-name{font-family:var(--font-display);font-size:1.1rem;letter-spacing:0.18em;text-transform:uppercase}
.av-header__brand-kicker{font-size:0.75rem;letter-spacing:0.18em;text-transform:uppercase;color:var(--gray-500)}
.av-header__nav{display:flex;align-items:center}
@media (max-width:768px){.av-header__nav{display:none}}
.nav-links{display:flex;align-items:center;gap:var(--space-4);font-size:var(--text-sm)}
.nav-link{position:relative;padding:0.35rem 0.1rem;color:var(--gray-600)}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:-0.25rem;height:2px;border-radius:999px;background:linear-gradient(to right,#06B6D4,#0EA5E9);transform:scaleX(0);transform-origin:left;transition:transform var(--transition-base)}
.nav-link:hover{color:var(--color-text)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link--active{color:var(--color-text)}
.nav-link--active::after{transform:scaleX(1)}
.nav-drawer{display:none;position:absolute;left:0;right:0;top:100%;padding:var(--space-3) var(--space-4) var(--space-4);background:radial-gradient(circle at 0 0,#FFFFFF 0,#F0F4F8 45%,#E2E8F0 100%);box-shadow:var(--shadow-elevated)}
.nav-drawer.open{display:block}
.nav-drawer .nav-links{flex-direction:column;align-items:flex-start;gap:var(--space-2)}
.nav-toggle{display:none;flex-direction:column;width:2.25rem;height:2.25rem;align-items:center;justify-content:center;gap:0.3rem;border-radius:999px;border:1px solid rgba(148,163,184,0.7);background:radial-gradient(circle at 0 0,#FFFFFF 0,#E2E8F0 50%,#CBD5F0 100%);box-shadow:var(--shadow-soft);transition:box-shadow var(--transition-base),transform var(--transition-base)}
.nav-toggle-bar{width:1.2rem;height:2px;border-radius:999px;background:linear-gradient(to right,#0F172A,#06B6D4)}
.nav-toggle:hover{transform:translateY(-1px);box-shadow:var(--shadow-elevated)}
.nav-toggle.is-active .nav-toggle-bar:first-child{transform:translateY(4px) rotate(45deg);transition:transform var(--transition-fast)}
.nav-toggle.is-active .nav-toggle-bar:last-child{transform:translateY(-4px) rotate(-45deg);transition:transform var(--transition-fast)}
@media (max-width:768px){.nav-toggle{display:flex}.nav-drawer .nav-links{display:flex}}
@media (prefers-reduced-motion:reduce){.nav-toggle,.nav-link::after,.nav-drawer{transition:none}