/* ============================================================
   ABM Partner — СЕКЦИЯ «РЕКОМЕНДАТЕЛЬНЫЕ ПИСЬМА»
   Одна бегущая строка вправо. Модальное окно просмотра PDF
   описано в ui.css (общий блок .modal + .viewer).
   ============================================================ */

.letters {
    --letter-width: clamp(12.5rem, 24vw, 16.5rem);
    --letter-gap: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--color-ink);
    background: var(--color-bg-tint);
}

/* ===== Шапка секции ===== */
.letters__header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.25rem 2.5rem;
    margin-bottom: var(--gap-section-title);
}

.letters__header .section__title {
    margin-bottom: 0;
}

/* ============================================================
   БЕГУЩАЯ СТРОКА
   ============================================================ */
.letters__marquee {
    /* Левый край — по контейнеру, правый — на всю ширину до края вьюпорта */
    margin-right: calc(50% - 50vw);
    overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, #000, #000 92%, transparent);
    mask-image: linear-gradient(90deg, #000, #000 92%, transparent);
    touch-action: pan-y;
    user-select: none;
    -webkit-user-select: none;
    cursor: grab;
    /* Запас под тени/бейдж/hover-подъём, чтобы overflow не резал их */
    padding: 1.375rem 0 2rem;
}

.letters.is-dragging .letters__marquee {
    cursor: grabbing;
}

.letters__marquee-track {
    display: flex;
    width: max-content;
}

.letters__marquee-group {
    display: flex;
    gap: var(--letter-gap);
    padding-right: var(--letter-gap);
}

/* ============================================================
   КАРТОЧКА ПИСЬМА
   ============================================================ */
.letter {
    flex: 0 0 auto;
    width: var(--letter-width);
}

.letter[hidden] {
    display: none;
}

.letter__media {
    position: relative;
}

/* «Стопка листов» под письмом */
.letter__media::before,
.letter__media::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius-sm);
    transition: transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.letter__media::before {
    background: var(--color-paper-top);
    transform: rotate(2.4deg) translateY(0.25rem);
}

.letter__media::after {
    background: var(--color-paper-bottom);
    transform: rotate(-2deg);
}

.letter__media:hover::before {
    transform: rotate(4deg) translateY(0.5rem);
}

.letter__media:hover::after {
    transform: rotate(-3.4deg) translateY(-0.125rem);
}

/* Сам «лист» — ссылка: открывает модалку с PDF,
   ctrl/cmd+click открывает PDF в новой вкладке */
.letter__paper {
    position: relative;
    z-index: 1;
    display: block;
    aspect-ratio: 210 / 297;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    cursor: zoom-in;
    box-shadow: var(--shadow-paper);
    transition:
        transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1),
        box-shadow 0.55s;
    outline: none;
}

.letter:hover .letter__paper,
.letter__paper:focus-visible {
    transform: translateY(-0.375rem);
    box-shadow: var(--shadow-paper-hover);
}

.letter__paper:focus-visible {
    outline: 2px solid var(--color-accent-strong);
    outline-offset: 3px;
}

.letter__paper img {
    -webkit-user-drag: none;
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
}

/* Бейдж-наклейка «PDF» */
.letter__badge {
    position: absolute;
    top: -0.5625rem;
    right: -0.4375rem;
    z-index: 3;
    padding: 0.3125rem 0.5625rem;
    background: var(--color-sticker);
    color: var(--color-white);
    font-size: var(--fs-xs);
    font-weight: 800;
    letter-spacing: 0.14em;
    border-radius: var(--radius-sm);
    transform: rotate(6deg);
    box-shadow: 0 0.375rem 0.75rem -0.375rem rgba(217, 67, 47, 0.6);
    pointer-events: none;
}

/* Подсказка «Смотреть» при наведении */
.letter__zoom {
    position: absolute;
    left: 0.625rem;
    bottom: 0.625rem;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 0.4375rem;
    padding: 0.5rem 0.8125rem;
    background: var(--color-sticker);
    color: var(--color-white);
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: var(--radius-pill);
    opacity: 0;
    transform: translateY(0.5rem);
    transition:
        opacity 0.35s,
        transform 0.35s;
    pointer-events: none;
    white-space: nowrap;
}

.letter:hover .letter__zoom,
.letter__paper:focus-visible .letter__zoom {
    opacity: 1;
    transform: translateY(0);
}

/* Превью — скан первой страницы */
.letter__preview {
    width: 100%;
    height: 100%;
}

.letter__preview img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

/* ============================================================
   НИЖНИЙ РЯД: КНОПКА + СТРЕЛКИ
   ============================================================ */
.letters__more {
    margin-top: clamp(1.75rem, 3vw, 2.5rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.875rem;
}

.letters__nav {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    flex: none;
}

/* ============================================================
   СЕТКА НА СТРАНИЦЕ РАЗДЕЛА
   Все письма сразу, без бегущей строки.
   ============================================================ */
.letters__grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr));
    gap: var(--letter-gap);
}

.letters__grid .letter {
    width: 100%;
}

.letters__empty {
    color: var(--color-muted);
}

/* ============================================================
   АДАПТИВ
   ============================================================ */
@media (max-width: 45rem) {  /* 720px */
    .letters__more {
        gap: 0.625rem;
    }
    .letters__more-link {
        flex: 0 1 auto;
        justify-content: center;
    }
    .letters__nav-btn {
        width: 2.75rem;
        height: 2.75rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .letters *,
    .letters *::before,
    .letters *::after {
        transition: none !important;
        animation: none !important;
    }
    .letter:hover .letter__paper {
        transform: none;
    }
    .letters__marquee {
        overflow-x: auto;
        -webkit-mask-image: none;
        mask-image: none;
        touch-action: auto;
        cursor: auto;
    }
}