.service-article .article-toc {
    display: grid;
    gap: var(--space-4);
    padding: var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
}

.service-article .article-toc__title {
    margin: 0;
    color: var(--color-text);
    font-size: var(--text-lg);
    line-height: 1.35;
}

.service-article .article-toc__list {
    margin: 0;
    padding: 0;
    columns: 2;
    column-gap: var(--space-7);
    counter-reset: article-toc;
    list-style: none;
}

.service-article .article-toc__item {
    min-width: 0;
    margin-bottom: var(--space-2);
    break-inside: avoid;
    counter-increment: article-toc;
}

.service-article .article-toc__item:last-child {
    margin-bottom: 0;
}

.service-article .article-toc__link {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text);
    font-size: var(--text-sm);
    font-weight: 700;
    line-height: 1.45;
}

.service-article .article-toc__link::before {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    content: counter(article-toc);
    display: grid;
    place-items: center;
    font-size: var(--text-xs);
    font-weight: 800;
    line-height: 1;
}

.service-article .article-toc__link:hover,
.service-article .article-toc__link:focus-visible {
    color: var(--color-primary-hover);
}

.service-article .article-toc__link:focus-visible {
    outline: 2px solid rgba(47, 111, 203, 0.35);
    outline-offset: 3px;
}

.service-section-nav {
    display: none;
}

.service-section-nav-mobile {
    display: none;
}

.service-section-nav__title {
    margin: 0 0 var(--space-3);
    color: var(--color-muted);
    font-size: var(--text-xs);
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.service-section-nav__list {
    display: grid;
    gap: var(--space-1);
    margin: 0;
    padding: 0;
    list-style: none;
}

.service-section-nav__link {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    font-size: var(--text-sm);
    font-weight: 700;
    line-height: 1.35;
    text-decoration: none;
    transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.service-section-nav__link:hover,
.service-section-nav__link:focus-visible,
.service-section-nav__link.is-active {
    background: var(--color-primary-soft);
    color: var(--color-primary-hover);
}

.service-section-nav__link:focus-visible {
    outline: 2px solid rgba(47, 111, 203, 0.35);
    outline-offset: 2px;
}

@media (min-width: 1120px) {
    .service-article__layout {
        grid-template-columns: minmax(0, 1fr) 280px;
        align-items: start;
        gap: var(--space-6);
    }

    .service-section-nav {
        max-height: var(--service-sticky-available-height);
        display: grid;
        grid-template-rows: auto minmax(0, 1fr);
        overflow: hidden;
        padding: var(--space-4);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, 0.86);
        box-shadow: 0 12px 30px rgba(15, 31, 51, 0.06);
        position: sticky;
        top: calc(var(--header-sticky-height) + var(--service-sticky-gap));
    }

    .service-section-nav__list {
        min-height: 0;
        overflow: auto;
        padding-right: var(--space-2);
        scrollbar-color: rgba(47, 111, 203, 0.46) var(--color-primary-soft);
        scrollbar-width: thin;
    }

    .service-section-nav__list::-webkit-scrollbar {
        width: 8px;
    }

    .service-section-nav__list::-webkit-scrollbar-track {
        border-radius: 999px;
        background: var(--color-primary-soft);
    }

    .service-section-nav__list::-webkit-scrollbar-thumb {
        border: 2px solid var(--color-primary-soft);
        border-radius: 999px;
        background: rgba(47, 111, 203, 0.5);
    }

    .service-section-nav__list::-webkit-scrollbar-thumb:hover {
        background: rgba(47, 111, 203, 0.72);
    }
}

@media (max-width: 1119px) {
    .service-section-nav {
        display: none;
    }

    .service-section-nav-mobile {
        display: block;
    }

    .service-section-nav-mobile__button {
        min-height: 44px;
        border: 1px solid rgba(47, 111, 203, 0.22);
        border-radius: var(--radius-sm);
        background: #ffffff;
        box-shadow: var(--shadow-card);
        color: var(--color-primary);
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        padding: 0 var(--space-4);
        font-family: inherit;
        font-size: var(--text-sm);
        font-weight: 800;
        line-height: 1;
        position: fixed;
        left: var(--space-4);
        bottom: var(--space-4);
        z-index: 46;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(12px);
        transition: opacity 180ms ease, visibility 180ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 180ms ease;
    }

    .service-section-nav-mobile__button.is-visible {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .service-section-nav-mobile__button::before {
        width: 18px;
        height: 18px;
        background: currentColor;
        content: '';
        display: block;
        mask: linear-gradient(#000 0 0) top / 100% 2px no-repeat,
            linear-gradient(#000 0 0) center / 100% 2px no-repeat,
            linear-gradient(#000 0 0) bottom / 100% 2px no-repeat;
        -webkit-mask: linear-gradient(#000 0 0) top / 100% 2px no-repeat,
            linear-gradient(#000 0 0) center / 100% 2px no-repeat,
            linear-gradient(#000 0 0) bottom / 100% 2px no-repeat;
    }

    .service-section-nav-mobile__button:hover,
    .service-section-nav-mobile__button:focus-visible {
        border-color: rgba(47, 111, 203, 0.36);
        box-shadow: var(--shadow-blue);
        transform: translateY(-2px);
    }

    .service-section-nav-mobile__button:focus-visible {
        outline: 2px solid rgba(47, 111, 203, 0.35);
        outline-offset: 3px;
    }

    .service-section-nav-mobile__overlay {
        background: rgba(7, 26, 47, 0.44);
        position: fixed;
        inset: 0;
        z-index: 60;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 180ms ease, visibility 180ms ease;
    }

    .service-section-nav-mobile__panel {
        max-height: min(72vh, 620px);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        background: var(--color-surface);
        box-shadow: 0 -18px 48px rgba(7, 26, 47, 0.18);
        box-sizing: border-box;
        display: grid;
        grid-template-rows: auto minmax(0, 1fr);
        padding: var(--space-5);
        position: fixed;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 61;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(100%);
        transition: transform 220ms ease, visibility 220ms ease;
    }

    .service-section-nav-mobile__header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-3);
        padding-bottom: var(--space-4);
        border-bottom: 1px solid var(--color-border);
    }

    .service-section-nav-mobile__title {
        margin: 0;
        color: var(--color-text);
        font-size: var(--text-lg);
        font-weight: 800;
        line-height: 1.3;
    }

    .service-section-nav-mobile__close {
        width: 44px;
        height: 44px;
        border: 1px solid var(--color-border);
        border-radius: 50%;
        background: var(--color-primary-soft);
        cursor: pointer;
        flex: 0 0 auto;
        position: relative;
    }

    .service-section-nav-mobile__close::before,
    .service-section-nav-mobile__close::after {
        width: 16px;
        height: 2px;
        border-radius: 999px;
        background: var(--color-primary);
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
    }

    .service-section-nav-mobile__close::before {
        transform: translate(-50%, -50%) rotate(45deg);
    }

    .service-section-nav-mobile__close::after {
        transform: translate(-50%, -50%) rotate(-45deg);
    }

    .service-section-nav-mobile__list {
        display: grid;
        gap: var(--space-1);
        margin: 0;
        padding: var(--space-3) 0 0;
        overflow: auto;
        counter-reset: section-nav-mobile;
        list-style: none;
    }

    .service-section-nav-mobile__item {
        counter-increment: section-nav-mobile;
    }

    .service-section-nav-mobile__link {
        min-height: 44px;
        border-radius: var(--radius-sm);
        color: var(--color-text);
        display: grid;
        grid-template-columns: 28px minmax(0, 1fr);
        align-items: center;
        gap: var(--space-3);
        padding: var(--space-2);
        font-size: var(--text-sm);
        font-weight: 700;
        line-height: 1.35;
        text-decoration: none;
    }

    .service-section-nav-mobile__link::before {
        width: 28px;
        height: 28px;
        border-radius: 50%;
        background: var(--color-primary-soft);
        color: var(--color-primary);
        content: counter(section-nav-mobile);
        display: grid;
        place-items: center;
        font-size: var(--text-xs);
        font-weight: 800;
        line-height: 1;
    }

    .service-section-nav-mobile__link:hover,
    .service-section-nav-mobile__link:focus-visible,
    .service-section-nav-mobile__link.is-active {
        background: var(--color-primary-soft);
        color: var(--color-primary-hover);
    }

    .service-section-nav-mobile.is-open .service-section-nav-mobile__overlay {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    .service-section-nav-mobile.is-open .service-section-nav-mobile__panel {
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .service-section-nav-mobile.is-open .service-section-nav-mobile__button {
        opacity: 0;
        pointer-events: none;
    }

    .service-section-nav-open .scroll-to-top {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
}

@media (max-width: 760px) {
    .service-article .article-toc {
        padding: var(--space-4);
    }

    .service-article .article-toc__list {
        columns: 1;
        column-gap: 0;
    }
}