/* Header and navigation styles extracted from main.css */
#site-header {
    width: 100%;
    display: block;
}

.site-header {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(6px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1002;
    border-bottom: 1px solid rgba(15,23,42,0.04);
    width: 100%;
}
.site-header .header-inner {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    padding: 14px 0;
}
.site-header .container { max-width: var(--content-max); margin: 0 auto; }
.logo {
    font-weight: 700;
    color: var(--brand-1);
    text-decoration: none;
    font-size: 1.1rem;
}

.logo-exam {
    color: var(--brand-1);
}

.logo-tools {
    color: #1f2937;
}
.site-nav {
    display: flex;
    gap: 1.25rem;
    visibility: visible;
    position: static;
    transform: none;
    width: auto;
    height: auto;
    padding: 0;
    background: transparent;
    box-shadow: none;
    border: none;
    margin-left: auto;
}
.site-nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
    transition: color 160ms ease, opacity 160ms ease;
}

.site-nav a.active { color: var(--brand-2); }
.site-nav a.active::after {
    content: "";
    display: block;
    height: 3px;
    width: 28px;
    background: var(--brand-2);
    margin: 6px auto 0;
    border-radius: 3px;
}
.nav-actions { display: flex; align-items: center; gap: 0.75rem; margin-left: auto; }
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    width: 40px;
    height: 34px;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    padding: 4px;
}
.nav-toggle span { display: block; height: 3px; background: var(--text); border-radius: 3px; }

.nav-cancel {
    display: none;
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    font-size: 32px;
    font-weight: bold;
    color: #1f2937;
    cursor: pointer;
    z-index: 1003;
}

/* Skip link for accessibility (header related) */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus {
    position: fixed;
    left: 12px;
    top: 12px;
    background: white;
    color: var(--text);
    padding: 8px 12px;
    border-radius: 6px;
    width: auto;
    height: auto;
    box-shadow: 0 6px 20px rgba(2,6,23,0.2);
    z-index: 80;
}

/* Mobile nav behavior */
@media (max-width: 768px) {
    .nav-toggle { display: inline-flex; width: 48px; height: 48px; background: rgba(255,255,255,0.1); border-radius: 6px; padding: 12px; }
    .site-header .header-inner { padding: 12px 8px; justify-content: space-between; }

    .site-nav {
        display: flex;
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        background: rgba(255,255,255,0.98);
        flex-direction: column;
        gap: 0;
        padding: 60px 18px 0 18px;
        box-shadow: -4px 0 12px rgba(2,6,23,0.12);
        border: 1px solid rgba(2,6,23,0.06);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 300ms ease, visibility 0s 300ms;
    z-index: 1003;
    }
    .site-nav a {
        padding: 12px 18px;
        opacity: 1;
        transform: none;
        transition: none;
    }
    .site-nav.open {
        transform: translateX(0);
        visibility: visible;
        transition: transform 300ms ease, visibility 0s 0s;
    }



    /* staggered reveal for nav items */
    .site-nav.open a:nth-child(1) { transition-delay: 60ms; }
    .site-nav.open a:nth-child(2) { transition-delay: 110ms; }
    .site-nav.open a:nth-child(3) { transition-delay: 160ms; }
    .site-nav.open a:nth-child(4) { transition-delay: 210ms; }
    .site-nav.open a:nth-child(5) { transition-delay: 260ms; }
    .site-nav.open a:nth-child(6) { transition-delay: 310ms; }

    /* overlay when menu open */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.55);
        z-index: 1000;
        opacity: 0;
        transition: opacity 220ms ease;
        pointer-events: none;
    }
    .nav-overlay.visible { opacity: 1; pointer-events: auto; }

    /* animated toggle to X when open */
    .nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
    .nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    .nav-cancel { display: block; }
}
/* Header-specific styles (placeholder) */
.site-header { }