/* ============================================================================
   Навигационные сферы (общий компонент для шапки и подвала)
   ============================================================================ */

.nav-spheres,
.footer-projects-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-sphere,
.footer-project {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    padding: 16px 20px;
    border-radius: var(--radius-2xl);
    transition: all var(--transition-bounce);
    min-width: 100px;
    position: relative;
    overflow: hidden;
    background: rgba(26,31,41,0.3);
    border: 1px solid rgba(255,255,255,0.05);
}

    /* added */
    .nav-sphere:focus-visible,
    .footer-project:focus-visible {
        outline: 2px solid var(--color-accent-blue);
        outline-offset: 2px;
    }

@media (max-width: 768px) {
    .nav-sphere,
    .footer-project {
        min-width: 80px;
        padding: 12px;
    }
}

.nav-sphere::before,
.footer-project::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
    transition: left 0.8s var(--ease-soft);
    z-index: -1;
}

.nav-sphere:hover::before,
.footer-project:hover::before {
    left: 100%;
}

.nav-sphere:hover,
.footer-project:hover {
    background: var(--color-surface-transparent);
    transform: translateY(-5px);
    border-color: currentColor;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3), 0 0 0 1px currentColor;
}

.nav-sphere-orb,
.footer-sphere {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-bottom: 12px;
    transition: all 0.8s var(--ease-float);
    position: relative;
    opacity: 0.9;
}

.nav-sphere:hover .nav-sphere-orb,
.footer-project:hover .footer-sphere {
    transform: scale(1.2);
    filter: brightness(1.3) drop-shadow(0 10px 20px rgba(var(--sphere-color-rgb), 0.5));
}

.nav-sphere-label,
.footer-project-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-text-secondary);
    transition: all 0.5s var(--ease-soft);
    letter-spacing: 0.03em;
}

.nav-sphere:hover .nav-sphere-label,
.footer-project:hover .footer-project-label {
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* ===== Цветовые вариации ===== */
.nav-sphere[href*="orientir"],
.footer-project[data-label="Защита от ИИ"] {
    color: var(--color-accent-blue);
}

    .nav-sphere[href*="orientir"] .nav-sphere-orb,
    .footer-project[data-label="Защита от ИИ"] .footer-sphere {
        background: radial-gradient(circle at 30% 30%, var(--color-accent-blue), transparent 70%);
        box-shadow: inset 0 0 15px rgba(255,255,255,0.1), 0 0 20px rgba(var(--color-accent-blue-rgb), 0.3), 0 0 40px rgba(var(--color-accent-blue-rgb), 0.15);
        --sphere-color-rgb: var(--color-accent-blue-rgb);
    }

.nav-sphere[href*="local_ai"],
.footer-project[data-label="Локальный ИИ"] {
    color: var(--color-accent-green);
}

    .nav-sphere[href*="local_ai"] .nav-sphere-orb,
    .footer-project[data-label="Локальный ИИ"] .footer-sphere {
        background: radial-gradient(circle at 30% 30%, var(--color-accent-green), transparent 70%);
        box-shadow: inset 0 0 15px rgba(255,255,255,0.1), 0 0 20px rgba(var(--color-accent-green-rgb), 0.3), 0 0 40px rgba(var(--color-accent-green-rgb), 0.15);
        --sphere-color-rgb: var(--color-accent-green-rgb);
    }

.nav-sphere[href*="lab"],
.footer-project[data-label="Лаборатория"] {
    color: var(--color-accent-yellow);
}

    .nav-sphere[href*="lab"] .nav-sphere-orb,
    .footer-project[data-label="Лаборатория"] .footer-sphere {
        background: radial-gradient(circle at 30% 30%, var(--color-accent-yellow), transparent 70%);
        box-shadow: inset 0 0 15px rgba(255,255,255,0.1), 0 0 20px rgba(var(--color-accent-yellow-rgb), 0.3), 0 0 40px rgba(var(--color-accent-yellow-rgb), 0.15);
        --sphere-color-rgb: var(--color-accent-yellow-rgb);
    }

.nav-sphere[href*="animation"],
.footer-project[data-label="Творчество"] {
    color: var(--color-accent-pink);
}

    .nav-sphere[href*="animation"] .nav-sphere-orb,
    .footer-project[data-label="Творчество"] .footer-sphere {
        background: radial-gradient(circle at 30% 30%, var(--color-accent-pink), transparent 70%);
        box-shadow: inset 0 0 15px rgba(255,255,255,0.1), 0 0 20px rgba(var(--color-accent-pink-rgb), 0.3), 0 0 40px rgba(var(--color-accent-pink-rgb), 0.15);
        --sphere-color-rgb: var(--color-accent-pink-rgb);
    }