/**
 * Knowledge hub topic list — Apple Support style rows / 2×2 tiles.
 */

.kh-topics {
    margin: 0;
}

.kh-topic-list {
    list-style: none;
    margin: 0;
    padding: 0.35rem;
    border-radius: var(--kh-radius);
    background: var(--kh-fill);
    border: 0.5px solid var(--kh-separator);
}

.kh-topic {
    margin: 0;
}

.kh-topic + .kh-topic {
    border-top: 0.5px solid var(--kh-separator);
}

.kh-topic__link {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 0.9rem 1rem;
    align-items: center;
    padding: 1.05rem 1rem;
    border-radius: var(--kh-row-radius);
    text-decoration: none;
    color: inherit;
    transition: background-color 0.18s ease;
}

.kh-topic__link:hover {
    background: color-mix(in srgb, var(--kh-surface) 88%, var(--kh-accent) 12%);
}

.kh-topic__link:focus-visible {
    outline: 2px solid var(--kh-accent);
    outline-offset: 2px;
}

.kh-topic__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 12px;
    background: var(--kh-accent-soft);
    color: var(--kh-accent);
}

.kh-topic__icon svg {
    width: 1.25rem;
    height: 1.25rem;
    display: block;
}

.kh-topic__body {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    min-width: 0;
}

.kh-topic__title {
    font-size: 1.0625rem;
    font-weight: 650;
    letter-spacing: -0.02em;
    line-height: 1.25;
    color: var(--kh-text);
}

.kh-topic__meta {
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--kh-accent);
}

.kh-topic__text {
    font-size: 0.875rem;
    line-height: 1.45;
    letter-spacing: -0.01em;
    color: var(--kh-label);
}

.kh-topic__chevron {
    display: inline-flex;
    color: var(--kh-label);
    opacity: 0.55;
    transition:
        transform 0.18s ease,
        opacity 0.18s ease;
}

.kh-topic__chevron svg {
    width: 0.55rem;
    height: 0.9rem;
    display: block;
}

.kh-topic__link:hover .kh-topic__chevron {
    opacity: 0.9;
    transform: translateX(2px);
    color: var(--kh-accent);
}

.kh-empty {
    margin: 0;
    padding: 1.25rem 1rem;
    color: var(--kh-label);
    font-size: 0.9375rem;
}

@media (min-width: 860px) {
    .kh-topic-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .kh-topic + .kh-topic {
        border-top: none;
    }

    .kh-topic__link {
        height: 100%;
        align-items: start;
        padding: 1.2rem 1.1rem;
        background: var(--kh-surface);
        border: 0.5px solid transparent;
        box-shadow: 0 0 0 0.5px rgba(0, 0, 0, 0.03);
    }

    .kh-topic__link:hover {
        border-color: rgba(0, 194, 168, 0.22);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
        background: var(--kh-surface);
    }

    .kh-topic__chevron {
        margin-top: 0.35rem;
    }

    .kh-topic__text {
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
}

@media (min-width: 1200px) {
    .knowledge-hub .kh-topic-list {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.65rem;
        padding: 0.65rem;
    }

    .knowledge-hub .kh-topic__link {
        padding: 1.3rem 1.2rem;
    }

    .knowledge-hub .kh-topic__text {
        -webkit-line-clamp: 4;
    }
}

@media (max-width: 639px) {
    .kh-topic-list {
        padding: 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
        background: var(--kh-surface);
    }

    .kh-topic__link {
        padding: 1rem;
        border-radius: 0;
    }

    .kh-topic__text {
        display: none;
    }
}

@media (max-width: 859px) {
    :root[data-theme="dark"] .kh-topic__link:hover {
        background: color-mix(in srgb, var(--kh-fill) 70%, var(--kh-accent) 30%);
    }
}

/* Academy index: a quiet editorial catalogue instead of a card wall. */
.kh-academy-track {
    display: grid;
    grid-template-columns: minmax(15rem, 0.42fr) minmax(0, 1fr);
    gap: clamp(2rem, 6vw, 6rem);
    padding: clamp(3rem, 7vw, 6.5rem) 0;
    border-bottom: 1px solid var(--kh-separator);
}

.kh-academy-track__head {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: 1rem;
    align-content: start;
    position: sticky;
    top: 5.5rem;
    align-self: start;
}

.kh-academy-track__index {
    margin: 0.3rem 0 0;
    font-size: 0.67rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    color: var(--kh-label);
}

.kh-academy-track__title {
    margin: 0 0 0.75rem;
    max-width: 13ch;
    font-size: clamp(1.8rem, 3vw, 2.75rem);
    font-weight: 540;
    line-height: 1.05;
    letter-spacing: -0.045em;
}

.kh-academy-track__lede {
    margin: 0;
    max-width: 27rem;
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--kh-label);
}

.kh-academy-topic-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.kh-academy-topic {
    border-top: 1px solid var(--kh-separator);
}

.kh-academy-topic:last-child {
    border-bottom: 1px solid var(--kh-separator);
}

.kh-academy-topic__link {
    display: grid;
    grid-template-columns: 2.5rem minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
    padding: 1.55rem 0;
    color: inherit;
    text-decoration: none;
    transition: padding 180ms ease, color 180ms ease;
}

.kh-academy-topic__link:hover {
    padding-left: 0.45rem;
    color: var(--kh-accent);
}

.kh-academy-topic__link:focus-visible {
    outline: 2px solid var(--kh-accent);
    outline-offset: 6px;
}

.kh-academy-topic__number {
    padding-top: 0.18rem;
    font-size: 0.7rem;
    font-variant-numeric: tabular-nums;
    color: var(--kh-label);
}

.kh-academy-topic__body {
    display: grid;
    gap: 0.4rem;
}

.kh-academy-topic__meta {
    font-size: 0.7rem;
    font-weight: 650;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--kh-accent);
}

.kh-academy-topic__title {
    max-width: 28ch;
    font-size: clamp(1.25rem, 2vw, 1.7rem);
    font-weight: 560;
    line-height: 1.18;
    letter-spacing: -0.03em;
}

.kh-academy-topic__text {
    max-width: 48rem;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--kh-label);
}

.kh-academy-topic__action {
    padding-top: 1.35rem;
    font-size: 0.78rem;
    font-weight: 650;
    white-space: nowrap;
}

@media (max-width: 760px) {
    .kh-academy-track {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding-block: 3.25rem;
    }

    .kh-academy-track__head {
        position: static;
    }

    .kh-academy-topic__link {
        grid-template-columns: 2rem minmax(0, 1fr);
    }

    .kh-academy-topic__action {
        display: none;
    }
}