/* ==========================================================
   Knowledge — список статей (/knowledge)
   ========================================================== */

.knowledge-hero {
    padding: 72px 0 48px;
    background:
        radial-gradient(ellipse 70% 50% at 85% 0%, rgba(13, 79, 215, 0.1), transparent 55%),
        linear-gradient(180deg, #ffffff 0%, var(--background) 100%);
    border-bottom: 1px solid var(--border);
}

.knowledge-hero__back {
    display: inline-flex;
    margin-bottom: 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.25s;
}

.knowledge-hero__back:hover {
    color: var(--blue);
}

.knowledge-hero h1 {
    margin: 12px 0 16px;
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text);
}

.knowledge-hero__text {
    max-width: 560px;
    margin: 0;
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-light);
}

.knowledge-list {
    padding: 64px 0 96px;
}

.knowledge-list__empty {
    color: var(--text-light);
    font-size: 17px;
}

.knowledge-list__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.knowledge-card {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 32px 28px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 4px);
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.knowledge-card:hover {
    transform: translateY(-4px);
    border-color: rgba(13, 79, 215, 0.22);
    box-shadow: 0 24px 50px rgba(16, 43, 93, 0.12);
}

.knowledge-card__label {
    display: inline-flex;
    align-self: flex-start;
    margin-bottom: 16px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(13, 79, 215, 0.08);
    color: var(--blue);
    font-size: 12px;
    font-weight: 600;
}

.knowledge-card__title {
    margin: 0 0 14px;
    font-size: 22px;
    line-height: 1.3;
    font-weight: 700;
}

.knowledge-card__title a {
    color: var(--text);
    text-decoration: none;
}

.knowledge-card__title a:hover {
    color: var(--blue);
}

.knowledge-card__excerpt {
    flex: 1;
    margin: 0 0 22px;
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.65;
}

.knowledge-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-light);
}

.knowledge-card__link {
    font-weight: 600;
    color: var(--blue);
    text-decoration: none;
}

.knowledge-card__link:hover {
    text-decoration: underline;
}

/*
 * Скрытые статьи (черновики с noindex): карточка бледнее,
 * как будто смотришь сквозь матовое стекло.
 * pointer-events: none на слое стекла — ссылки остаются кликабельными.
 */
.knowledge-card--hidden {
    background: rgba(255, 255, 255, 0.55);
    border-color: rgba(228, 233, 242, 0.7);
    box-shadow: none;
    cursor: pointer;
}

.knowledge-card--hidden::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    border-radius: inherit;
    pointer-events: none;
    background:
        linear-gradient(
            155deg,
            rgba(255, 255, 255, 0.58) 0%,
            rgba(245, 248, 253, 0.28) 45%,
            rgba(255, 255, 255, 0.5) 100%
        );
    backdrop-filter: blur(4px) saturate(0.5);
    -webkit-backdrop-filter: blur(4px) saturate(0.5);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
    transition: background 0.25s ease;
}

.knowledge-card__hit {
    position: absolute;
    inset: 0;
    z-index: 2;
}

.knowledge-card--hidden > *:not(.knowledge-card__hit) {
    filter: blur(0.45px) grayscale(0.18);
    opacity: 0.72;
    transition: filter 0.25s ease, opacity 0.25s ease;
}

.knowledge-card--hidden:hover,
.knowledge-card--hidden:focus-within {
    transform: translateY(-2px);
    border-color: rgba(13, 79, 215, 0.14);
    box-shadow: 0 12px 28px rgba(16, 43, 93, 0.06);
}

.knowledge-card--hidden:hover::after,
.knowledge-card--hidden:focus-within::after {
    background:
        linear-gradient(
            155deg,
            rgba(255, 255, 255, 0.38) 0%,
            rgba(245, 248, 253, 0.18) 45%,
            rgba(255, 255, 255, 0.32) 100%
        );
    backdrop-filter: blur(2.5px) saturate(0.7);
    -webkit-backdrop-filter: blur(2.5px) saturate(0.7);
}

.knowledge-card--hidden:hover > *:not(.knowledge-card__hit),
.knowledge-card--hidden:focus-within > *:not(.knowledge-card__hit) {
    filter: blur(0.2px) grayscale(0.08);
    opacity: 0.88;
}

@media (prefers-reduced-transparency: reduce) {
    .knowledge-card--hidden::after {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background: rgba(255, 255, 255, 0.55);
    }

    .knowledge-card--hidden > *:not(.knowledge-card__hit),
    .knowledge-card--hidden:hover > *:not(.knowledge-card__hit),
    .knowledge-card--hidden:focus-within > *:not(.knowledge-card__hit) {
        filter: none;
    }
}

@media (max-width: 640px) {
    .knowledge-hero {
        padding: 48px 0 36px;
    }

    .knowledge-list {
        padding: 40px 0 64px;
    }

    .knowledge-list__grid {
        grid-template-columns: 1fr;
    }
}