/* ==========================================================================
   ИАПП · «Полезные материалы» (макет category/useful.php) v1.0.1
   ========================================================================== */

.iapp-useful {
    --u-navy:   var(--iapp-navy-900, #14294a);
    --u-text:   var(--iapp-navy-700, #1e3e67);
    --u-blue:   var(--iapp-blue-500, #36609c);
    --u-blue-d: var(--iapp-blue-600, #2a4e82);
    --u-tint:   var(--iapp-blue-100, #e4edf7);
    --u-soft:   var(--iapp-blue-50, #f4f8fd);
    --u-line:   var(--iapp-line, #d9e2ec);
    --u-muted:  var(--iapp-slate-500, #6b7a8c);

    max-width: 64rem;
    margin: 0 auto;
    padding-block: 1rem 3rem;
    color: var(--u-text);
}

/* ---- Заголовок ---------------------------------------------------------- */

.iapp-useful__head { margin-bottom: 2rem; }

.iapp-useful .iapp-useful__title {
    margin: 0;
    color: var(--u-navy);
    font-size: clamp(1.75rem, 3.2vw, 2.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -.015em;
}

.iapp-useful__lead {
    max-width: 52ch;
    margin: .75rem 0 0;
    color: var(--u-muted);
    font-size: 1.0625rem;
    line-height: 1.6;
}

.iapp-useful__empty {
    padding: 2.5rem 1.5rem;
    background: var(--u-soft);
    border-radius: 16px;
    color: var(--u-muted);
    text-align: center;
}

/* ---- Фильтр по типу ----------------------------------------------------- */

.iapp-useful__filter {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin-bottom: 1.5rem;
}

.iapp-useful__chip {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-height: 40px;
    padding: .375rem 1rem;
    background: #fff;
    border: 1px solid var(--u-line);
    border-radius: 999px;
    color: var(--u-text);
    font: inherit;
    font-size: .9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}

.iapp-useful__chip span { color: var(--u-muted); font-weight: 500; }
.iapp-useful__chip:hover { border-color: var(--u-blue); }

.iapp-useful__chip[aria-pressed="true"] {
    background: var(--u-navy);
    border-color: var(--u-navy);
    color: #fff;
}

.iapp-useful__chip[aria-pressed="true"] span { color: rgba(255, 255, 255, .7); }

/* ---- Список ------------------------------------------------------------- */

.iapp-useful__list {
    display: grid;
    gap: 1rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.iapp-useful__item { margin: 0; }
.iapp-useful__item[hidden] { display: none; }

.iapp-useful .iapp-useful__card {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 1.5rem 1rem 1rem;
    background: #fff;
    border: 1px solid var(--u-line);
    border-radius: 20px;
    color: inherit;
    text-decoration: none;
    box-shadow: 0 2px 12px rgba(20, 41, 74, .05);
    transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.iapp-useful .iapp-useful__card:hover {
    border-color: var(--iapp-blue-200, #c3dbf1);
    box-shadow: 0 16px 32px rgba(20, 41, 74, .1);
    transform: translateY(-2px);
    color: inherit;
    text-decoration: none;
}

.iapp-useful .iapp-useful__card:focus-visible {
    outline: 3px solid rgba(54, 96, 156, .45);
    outline-offset: 3px;
}

/* Картинка / значок */
.iapp-useful__thumb {
    position: relative;
    display: block;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: linear-gradient(135deg, var(--iapp-blue-300, #90bae4) 0%, var(--iapp-blue-200, #c3dbf1) 100%);
    border-radius: 14px;
}

.iapp-useful__thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s ease;
}

.iapp-useful__card:hover .iapp-useful__thumb img { transform: scale(1.04); }

.iapp-useful__icon {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--u-navy);
}

/* Текст */
.iapp-useful__body { display: grid; gap: .375rem; min-width: 0; }

.iapp-useful__type {
    justify-self: start;
    padding: .2rem .7rem;
    background: var(--u-tint);
    border-radius: 999px;
    color: var(--u-blue-d);
    font-size: .8125rem;
    font-weight: 700;
    letter-spacing: .01em;
}

.iapp-useful__name {
    color: var(--u-navy);
    font-size: clamp(1.125rem, 1.8vw, 1.3125rem);
    font-weight: 700;
    line-height: 1.3;
}

.iapp-useful__text {
    display: -webkit-box;
    overflow: hidden;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    color: var(--u-muted);
    font-size: .9375rem;
    line-height: 1.55;
}

.iapp-useful__meta {
    display: flex;
    flex-wrap: wrap;
    gap: .25rem 0;
    color: var(--u-text);
    font-size: .875rem;
    font-weight: 600;
}

.iapp-useful__meta > span + span::before {
    content: "·";
    margin-inline: .5rem;
    color: var(--u-muted);
}

/* Кнопка справа */
.iapp-useful__go {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-height: 44px;
    padding: .5rem 1.25rem;
    background: var(--u-blue);
    border-radius: 999px;
    color: #fff;
    font-size: .9375rem;
    font-weight: 600;
    white-space: nowrap;
    transition: background-color .18s ease;
}

.iapp-useful__card:hover .iapp-useful__go { background: var(--u-blue-d); }
.iapp-useful__go svg { transition: transform .18s ease; }
.iapp-useful__card:hover .iapp-useful__go svg { transform: translateX(2px); }

/* ---- Планшет и телефон -------------------------------------------------- */

@media (max-width: 767.98px) {
    .iapp-useful .iapp-useful__card {
        grid-template-columns: 112px minmax(0, 1fr);
        gap: 1rem;
        padding: .875rem;
    }

    .iapp-useful__go {
        grid-column: 1 / -1;
        justify-content: center;
        width: 100%;
    }
}

@media (max-width: 419.98px) {
    .iapp-useful .iapp-useful__card { grid-template-columns: minmax(0, 1fr); }
    .iapp-useful__thumb { aspect-ratio: 16 / 9; }
    .iapp-useful__text { -webkit-line-clamp: 3; }
}

@media (prefers-reduced-motion: reduce) {
    .iapp-useful * { transition: none !important; }
}