/* =========================================================
   HERO ISOTONIC — Sticky scrollytelling каркас
   Приведён в соответствие с BURSTY UI KIT
   ========================================================= */

/* ---------- Локальные токены секции (наследуют палитру кита) ---------- */
.hero-iso {
    --hero-accent: var(--accent);
    --hero-accent-soft: var(--accent-alpha-20);

    position: relative;
    overflow: clip;
}

.hero-iso__scroll {
    position: relative;
    height: calc(var(--slides, 3) * 100svh);
}

.hero-iso__sticky {
    position: sticky;
    top: 0;
    height: 100svh;
    overflow: visible;
    display: flex;
    align-items: center;
    padding-block: var(--space-20);
    z-index: 2;
}

.hero-iso__sticky .container {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-iso__progress {
    position: absolute;
    right: var(--space-8);
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.hero-iso__dot {
    width: 12px;
    height: 12px;
    padding: 0;
    border: var(--border-medium) solid
        color-mix(in srgb, var(--hero-accent) 50%, transparent);
    border-radius: var(--radius-full);
    background: transparent;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(.22, .61, .36, 1);
    position: relative;
}

.hero-iso__dot::after {
    content: "";
    position: absolute;
    inset: 2px;
    border-radius: var(--radius-full);
    background: var(--hero-accent);
    transform: scale(0);
    transition: transform 0.35s cubic-bezier(.22, .61, .36, 1);
}

.hero-iso__dot.is-active {
    border-color: var(--hero-accent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--hero-accent) 18%, transparent);
}

.hero-iso__dot.is-active::after {
    transform: scale(1);
}

.hero-iso__dot:hover {
    border-color: var(--hero-accent);
}

.hero-iso__dot:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--accent-alpha-40);
}

.hero-iso__scroll-hint {
    position: absolute;
    left: 50%;
    bottom: 10rem;
    transform: translateX(-50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    opacity: 1;
    transition: opacity 0.5s ease;
}

.hero-iso__scroll-hint.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.hero-iso__scroll-hint-text {
    font-family: var(--font-body);
    font-size: var(--fs-caption);
    font-weight: 600;
    color: var(--text-tertiary);
    letter-spacing: var(--ls-caption);
    text-transform: uppercase;
}

.hero-iso__scroll-hint-icon {
    width: 24px;
    height: 38px;
    border: var(--border-medium) solid
        color-mix(in srgb, var(--hero-accent) 60%, transparent);
    border-radius: var(--radius-lg);
    position: relative;
}

.hero-iso__scroll-hint-icon::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 7px;
    width: 4px;
    height: 8px;
    margin-left: -2px;
    border-radius: var(--radius-sm);
    background: var(--hero-accent);
    animation: heroScrollWheel 1.6s ease-in-out infinite;
}

@keyframes heroScrollWheel {
    0%   { transform: translateY(0); opacity: 1; }
    70%  { transform: translateY(12px); opacity: 0; }
    100% { transform: translateY(0); opacity: 0; }
}

@media (max-width: 768px) {
    .hero-iso__sticky {
        padding-block: var(--space-12);
    }

    .hero-iso__progress {
        right: var(--space-4);
        gap: var(--space-2);
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-iso__scroll-hint-icon::after {
        animation: none;
    }

    .hero-iso__dot,
    .hero-iso__dot::after {
        transition: none;
    }
}