/* ==================== HEADER / NAVIGATION ==================== */

.header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--duration-normal) ease;
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    gap: var(--space-lg);
}

.nav-logo .logo {
    display: block;
    max-width: 8.125rem;
    height: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xs);
    margin: 0;
    padding: 0;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast) ease, background var(--duration-fast) ease;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link--active {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link--active {
    font-weight: 600;
}

/* App link in nav — subtle accent */
.nav-link-app {
    color: var(--primary);
    font-weight: 600;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.lang-select {
    padding: 0.375rem 0.75rem;
    font-family: var(--font-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    letter-spacing: 0.03em;
}

.lang-select:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Header CTA buttons — small and subtle */
.nav-actions .glass-btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.8125rem;
    border-width: 0.09375rem;
}

.glass-btn-donate {
    background: transparent;
    color: var(--accent);
    border-color: var(--border);
}

.glass-btn-donate:hover {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent);
    box-shadow: none;
}

.glass-btn-app {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.glass-btn-app:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* Mobile Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.3125rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle span {
    width: 1.25rem;
    height: 0.09375rem;
    background: var(--text-primary);
    transition: all var(--duration-fast) ease;
    border-radius: 0.0625rem;
}

/* ==================== Mobile ==================== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 3.75rem;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        padding: var(--space-lg);
        gap: var(--space-2xs);
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--duration-slow) var(--ease-out);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(0.25rem, 0.25rem);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(0.25rem, -0.25rem);
    }

    .nav-actions .glass-btn {
        display: none;
    }
}