.feature-index {
    position: relative;
    z-index: 2;
    margin-top: -42px;
}

.feature-index-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(14px);
}

.feature-index a {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--ink-soft);
    background: var(--surface);
    font-size: 11px;
    font-weight: 800;
    text-decoration: none;
    transition: border-color .2s ease, color .2s ease, transform .2s ease;
}

.feature-index a:hover {
    border-color: var(--green);
    color: var(--green-deep);
    transform: translateY(-2px);
}

.feature-category-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.feature-category {
    position: relative;
    display: flex;
    min-height: 390px;
    flex-direction: column;
    padding: 34px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: var(--surface);
    overflow: hidden;
}

.feature-category::after {
    position: absolute;
    top: -52px;
    left: -52px;
    width: 150px;
    height: 150px;
    content: "";
    border: 30px solid var(--green-soft);
    border-radius: 50%;
    opacity: .62;
    pointer-events: none;
}

.feature-category.feature-category-wide {
    grid-column: span 2;
    min-height: 0;
}

.feature-category-head {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 54px 1fr;
    gap: 15px;
    align-items: center;
}

.feature-category-icon {
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    border-radius: 17px;
    color: var(--green-deep);
    background: var(--green-soft);
}

.feature-category-icon svg {
    width: 26px;
    height: 26px;
}

.feature-category h2 {
    margin: 0 0 2px;
    font-size: 25px;
}

.feature-category-head p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 12px;
}

.feature-points {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 11px;
    padding: 0;
    margin: 27px 0 30px;
    list-style: none;
}

.feature-points li {
    display: grid;
    grid-template-columns: 22px 1fr;
    gap: 9px;
    align-items: start;
    color: var(--ink-soft);
    font-size: 13px;
}

.feature-points li::before {
    width: 21px;
    height: 21px;
    display: grid;
    place-items: center;
    content: "✓";
    border-radius: 7px;
    color: var(--green-deep);
    background: var(--green-soft);
    font-size: 9px;
    font-weight: 900;
}

.feature-category-link {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 6px;
    margin-top: auto;
    color: var(--green-deep);
    font-size: 12px;
    font-weight: 900;
    text-decoration: none;
}

.feature-category-link:hover {
    text-decoration: underline;
    text-underline-offset: 4px;
}

.feature-category-wide .feature-points {
    grid-template-columns: repeat(3, 1fr);
}

.feature-showcase-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.feature-showcase {
    margin: 0;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, .13);
    border-radius: 27px;
    background: rgba(255, 255, 255, .05);
}

.feature-showcase img {
    width: 100%;
    height: 510px;
    display: block;
    border-radius: 19px;
    object-fit: cover;
    object-position: top;
}

.feature-showcase figcaption {
    padding: 12px 8px 4px;
    color: rgba(255, 255, 255, .65);
    font-size: 11px;
    font-weight: 700;
}

.feature-principles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.feature-principle {
    padding: 28px;
    border-top: 4px solid var(--green);
    border-radius: 22px;
    background: var(--surface-soft);
}

.feature-principle strong {
    display: block;
    margin-bottom: 8px;
    font-size: 17px;
}

.feature-principle p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 12px;
}

@media (max-width: 900px) {
    .feature-category-grid,
    .feature-showcase-grid {
        grid-template-columns: 1fr 1fr;
    }

    .feature-category-wide {
        grid-column: span 2;
    }

    .feature-showcase:last-child {
        grid-column: span 2;
    }

    .feature-principles {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .feature-index {
        margin-top: -28px;
    }

    .feature-index-inner {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .feature-index-inner::-webkit-scrollbar {
        display: none;
    }

    .feature-index a {
        flex: 0 0 auto;
    }

    .feature-category-grid,
    .feature-showcase-grid,
    .feature-category-wide .feature-points {
        grid-template-columns: 1fr;
    }

    .feature-category,
    .feature-category.feature-category-wide,
    .feature-showcase:last-child {
        grid-column: auto;
    }

    .feature-category {
        min-height: 0;
        padding: 25px;
    }

    .feature-category-head {
        grid-template-columns: 46px 1fr;
    }

    .feature-category-icon {
        width: 46px;
        height: 46px;
    }

    .feature-category h2 {
        font-size: 21px;
    }

    .feature-showcase img {
        height: 455px;
    }
}