.blog-toc {
    position: relative;
    margin: 0 0 clamp(28px, 3vw, 44px);
    isolation: isolate;
}

.blog-toc__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    padding: 0 0 clamp(14px, 1.4vw, 18px);
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: none;
    color: var(--md-color-text-primary);
    cursor: pointer;
    text-align: left;
    transition: border-color 0.3s ease;
}

.blog-toc__toggle:hover {
    border-color: rgba(108, 197, 251, 0.45);
}

.blog-toc__heading {
    color: var(--md-color-text-primary);
    font-size: clamp(18px, 1.4vw, 22px);
    line-height: 1.2;
    font-weight: var(--md-font-weight-semibold);
    letter-spacing: -0.2px;
}

.blog-toc__toggle-icon {
    flex: 0 0 auto;
    width: 14px;
    height: 14px;
    position: relative;
    transition: transform 0.35s ease;
}

.blog-toc__toggle-icon::before,
.blog-toc__toggle-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    background: var(--md-color-text-primary);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.blog-toc__toggle-icon::before {
    width: 12px;
    height: 1px;
    transform: translate(-50%, -50%);
}

.blog-toc__toggle-icon::after {
    width: 1px;
    height: 12px;
    transform: translate(-50%, -50%);
}

.blog-toc__toggle[aria-expanded="true"] .blog-toc__toggle-icon::after {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(90deg);
}

.blog-toc__panel {
    overflow: hidden;
    height: 0;
    will-change: height;
}

.blog-toc__list {
    list-style: none;
    margin: 0;
    padding: clamp(16px, 1.6vw, 22px) 0 0;
    display: flex;
    flex-direction: column;
    counter-reset: blog-toc;
}

.blog-toc__item {
    position: relative;
    padding: 14px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.blog-toc__item:first-child {
    border-top: 0;
}

.blog-toc__link {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 18px;
    align-items: baseline;
    color: rgba(255, 255, 255, 0.86);
    text-decoration: none;
    transition: color 0.25s ease;
    padding-left: 14px;
    position: relative;
}

.blog-toc__link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 0;
    background: #6CC5FB;
    transform: translateY(-50%);
    border-radius: 0 2px 2px 0;
    transition: height 0.3s ease;
}

.blog-toc__link:hover,
.blog-toc__link.is-active {
    color: var(--md-color-text-primary);
}

.blog-toc__link:hover::before,
.blog-toc__link.is-active::before {
    height: 100%;
}

.blog-toc__index {
    font-size: 12px;
    font-weight: var(--md-font-weight-semibold);
    color: rgba(108, 197, 251, 0.75);
    letter-spacing: 1.2px;
    font-feature-settings: 'tnum';
}

.blog-toc__text {
    font-size: 16px;
    line-height: 1.45;
    font-weight: var(--md-font-weight-medium);
    text-wrap: balance;
}

.blog-toc__sublist {
    list-style: none;
    margin: 8px 0 0 32px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.blog-toc__subitem {
    position: relative;
}

.blog-toc__sublink {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding-left: 14px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 14px;
    line-height: 1.4;
    font-weight: var(--md-font-weight-light);
    text-decoration: none;
    transition: color 0.25s ease;
    position: relative;
}

.blog-toc__sublink::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 1px;
    background: currentColor;
    opacity: 0.5;
    transform: translateY(-50%);
    transition: width 0.3s ease, opacity 0.3s ease;
}

.blog-toc__sublink:hover,
.blog-toc__sublink.is-active {
    color: #6CC5FB;
}

.blog-toc__sublink:hover::before,
.blog-toc__sublink.is-active::before {
    width: 14px;
    opacity: 1;
}

@media (min-width: 992px) {
    .blog-toc__toggle {
        cursor: default;
    }

    .blog-toc__toggle:hover {
        border-color: rgba(255, 255, 255, 0.1);
    }

    .blog-toc__toggle-icon {
        display: none;
    }

    .blog-toc__panel {
        height: auto !important;
        max-height: 150px;
        overflow: hidden;
        position: relative;
    }

    .blog-toc__panel::after {
        content: '';
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        height: 60px;
        background: linear-gradient(180deg, rgba(23, 31, 57, 0) 0%, var(--md-color-bg-primary) 100%);
        pointer-events: none;
        transition: opacity 0.4s ease;
    }

    .blog-toc__panel.is-expanded {
        max-height: none;
        overflow: visible;
    }

    .blog-toc__panel.is-expanded::after {
        opacity: 0;
        pointer-events: none;
    }
}

.blog-toc__expand {
    display: none;
    margin-top: 12px;
    padding: 0;
    border: 0;
    background: none;
    color: #6CC5FB;
    font-size: 13px;
    font-weight: var(--md-font-weight-semibold);
    letter-spacing: 0.4px;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.blog-toc__expand.is-visible {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.blog-toc__expand.is-hidden {
    display: none;
}

@media (max-width: 991.98px) {
    .blog-toc__list {
        padding: 16px 0 4px;
    }

    .blog-toc__expand {
        display: none !important;
    }
}

@media (max-width: 575.98px) {
    .blog-toc__toggle {
        padding-bottom: 14px;
    }

    .blog-toc__heading {
        font-size: 17px;
    }

    .blog-toc__text {
        font-size: 15px;
    }
}