/* ==========================================================================
   Полноразмерные навигационные сферы (для главной страницы)
   ========================================================================== */

.sphere-nav-section {
    padding: clamp(80px, 10vh, 120px) 0;
    position: relative;
}

.section-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: clamp(60px, 8vh, 100px);
    position: relative;
}

    .section-title::after {
        content: '';
        position: absolute;
        bottom: -20px;
        left: 50%;
        transform: translateX(-50%);
        width: 100px;
        height: 4px;
        background: linear-gradient(90deg, var(--principle-1, #60a5fa), var(--principle-2, #34d399), var(--principle-3, #fbbf24), var(--principle-4, #f472b6));
        border-radius: 2px;
    }

.sphere-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 40px;
    justify-items: center;
}

@media (min-width: 1200px) {
    .sphere-wrapper {
        display: flex;
        justify-content: center;
        gap: 60px;
    }
}

.sphere-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    padding: 30px;
    border-radius: 24px;
    transition: all var(--transition-smooth, 0.6s cubic-bezier(0.33,1,0.68,1));
    text-decoration: none;
    color: var(--color-text-secondary, rgba(160,179,201,0.8));
    z-index: 2;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(26,31,41,0.3), rgba(16,21,31,0.3));
    border: 1px solid rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    cursor: pointer;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

    .sphere-link::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, cubic-bezier(0.33,1,0.68,1));
        z-index: -1;
    }

    .sphere-link:hover::before {
        left: 100%;
    }

    .sphere-link:hover {
        color: var(--color-text-primary, rgba(230,238,245,0.95));
        background: linear-gradient(145deg, rgba(36,41,51,0.4), rgba(26,31,41,0.4));
        transform: translateY(-10px);
        border-color: currentColor;
        box-shadow: 0 25px 80px rgba(0,0,0,0.4), 0 0 0 1px currentColor, 0 0 40px rgba(var(--sphere-color-rgb), 0.3);
    }

        .sphere-link:hover .sphere {
            transform: scale(1.15);
            animation: spherePulse 2s var(--ease-soft, cubic-bezier(0.33,1,0.68,1)) infinite;
            filter: brightness(1.3) drop-shadow(0 15px 40px rgba(var(--sphere-color-rgb), 0.5));
        }

        .sphere-link:hover .sphere-label {
            color: var(--color-text-primary);
            transform: translateY(-3px);
        }

        .sphere-link:hover .sphere-desc {
            opacity: 1;
            transform: translateY(0);
        }

    .sphere-link.particle-hover {
        color: var(--color-text-primary);
        background: linear-gradient(145deg, rgba(36,41,51,0.5), rgba(26,31,41,0.5));
        border-color: currentColor;
        box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 0 1px currentColor, 0 0 30px rgba(var(--sphere-color-rgb), 0.4);
    }

        .sphere-link.particle-hover .sphere {
            transform: scale(1.1);
            filter: brightness(1.2) drop-shadow(0 10px 30px rgba(var(--sphere-color-rgb), 0.4));
            animation: spherePulse 1.5s var(--ease-soft) infinite;
        }

.sphere {
    width: var(--sphere-size, 120px);
    height: var(--sphere-size, 120px);
    border-radius: 50%;
    margin-bottom: 25px;
    transition: all 0.8s var(--ease-float, cubic-bezier(0.4,0,0.2,1));
    position: relative;
    opacity: 0.9;
    filter: brightness(1.1);
    animation: sphereFloat 8s var(--ease-smooth, cubic-bezier(0.16,1,0.3,1)) infinite;
}

    .sphere::before {
        content: '';
        position: absolute;
        top: -10px;
        left: -10px;
        right: -10px;
        bottom: -10px;
        border-radius: 50%;
        background: inherit;
        opacity: 0;
        filter: blur(20px);
        transition: opacity var(--transition-smooth, 0.6s cubic-bezier(0.33,1,0.68,1));
        z-index: -1;
    }

.sphere-link:hover .sphere::before,
.sphere-link.particle-hover .sphere::before {
    opacity: 0.4;
}

#sphere-1 {
    background: radial-gradient(circle at 30% 30%, var(--color-accent-blue, rgba(79,195,247,0.95)), transparent 70%);
    box-shadow: inset 0 0 30px rgba(255,255,255,0.1), 0 0 40px rgba(79,195,247,0.3), 0 0 80px rgba(79,195,247,0.15);
}

.sphere-link[data-label="Защита от манипуляций ИИ"] .sphere {
    --sphere-color-rgb: 79,195,247;
}

#sphere-2 {
    background: radial-gradient(circle at 30% 30%, var(--color-accent-green, rgba(165,214,167,0.95)), transparent 70%);
    box-shadow: inset 0 0 30px rgba(255,255,255,0.1), 0 0 40px rgba(165,214,167,0.3), 0 0 80px rgba(165,214,167,0.15);
}

.sphere-link[data-label="Локальный ИИ"] .sphere {
    --sphere-color-rgb: 165,214,167;
}

#sphere-3 {
    background: radial-gradient(circle at 30% 30%, var(--color-accent-yellow, rgba(255,204,128,0.95)), transparent 70%);
    box-shadow: inset 0 0 30px rgba(255,255,255,0.1), 0 0 40px rgba(255,204,128,0.3), 0 0 80px rgba(255,204,128,0.15);
}

.sphere-link[data-label="Лаборатория"] .sphere {
    --sphere-color-rgb: 255,204,128;
}

#sphere-4 {
    background: radial-gradient(circle at 30% 30%, var(--color-accent-pink, rgba(244,143,177,0.95)), transparent 70%);
    box-shadow: inset 0 0 30px rgba(255,255,255,0.1), 0 0 40px rgba(244,143,177,0.3), 0 0 80px rgba(244,143,177,0.15);
}

.sphere-link[data-label="Творчество"] .sphere {
    --sphere-color-rgb: 244,143,177;
}

@keyframes sphereFloat {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }

    50% {
        transform: translateY(-10px) scale(1.05);
    }
}

@keyframes spherePulse {
    0%, 100% {
        box-shadow: inset 0 0 40px rgba(255,255,255,0.15), 0 0 60px rgba(var(--sphere-color-rgb), 0.5), 0 0 120px rgba(var(--sphere-color-rgb), 0.3);
    }

    50% {
        box-shadow: inset 0 0 50px rgba(255,255,255,0.2), 0 0 80px rgba(var(--sphere-color-rgb), 0.7), 0 0 150px rgba(var(--sphere-color-rgb), 0.4);
    }
}

.sphere-label {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    transition: all 0.5s var(--ease-soft);
    position: relative;
    letter-spacing: 0.03em;
}

    .sphere-label::after {
        content: '';
        position: absolute;
        bottom: -6px;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 2px;
        background: currentColor;
        transition: width 0.5s var(--ease-soft);
    }

.sphere-link:hover .sphere-label::after,
.sphere-link.particle-hover .sphere-label::after {
    width: 80%;
}

.sphere-desc {
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.8;
    transition: all 0.6s var(--ease-soft);
    max-width: 240px;
    color: var(--color-text-muted, rgba(98,117,151,0.6));
}

/* Адаптация под мобильные */
@media (max-width: 1024px) {
    .sphere-wrapper {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .sphere-wrapper {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .sphere {
        width: calc(var(--sphere-size) * 0.9);
        height: calc(var(--sphere-size) * 0.9);
    }
}

@media (max-width: 480px) {
    .sphere {
        width: calc(var(--sphere-size) * 0.8);
        height: calc(var(--sphere-size) * 0.8);
    }

    .sphere-link {
        padding: 20px;
    }
}