/**
 * ==========================================================================
 * product.css — Стили карточки товара (B2B-каталог тканей)
 * ==========================================================================
 * Методология: Mobile First
 * Токены: совпадают с styles.css (цветовая палитра, шрифты, скругления)
 * ==========================================================================
 */


/* ========================================================================
   CSS Custom Properties
   ======================================================================== */
:root {
    --color-primary: #d4a574;
    --color-primary-dark: #c08c5a;
    --color-dark: #2c3e50;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg: #f8f9fa;
    --color-white: #ffffff;
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;

    /*
     * Расстояние между блоками страницы (п. 3.7 ТЗ) =
     * высоте строки H2 (.product-section-title).
     * Интерпретация: font-size H2 (визуальная высота символов).
     * H2 font-size: 1.4rem (моб.) / 1.5rem (1024px+)
     */
    --section-gap: 0.467rem;
}


/* ========================================================================
   Базовые стили страницы товара
   ======================================================================== */
.product-page {
    padding-top: 10px;
    padding-bottom: 30px;
    background: var(--color-white);
}

/*
 * Перебиваем глобальный section { padding: 80px 0 } из styles.css.
 * Без этого между секциями было 160px пустоты (80px bottom + 80px top).
 * Задаём компактный зазор ≈ высоте заголовка секции:
 *   H2 font-size 1.5rem × line-height 1.2 + padding-bottom 10px ≈ 39px.
 */
.product-page section {
    padding-top: 0;
    padding-bottom: 0;
    margin-bottom: 40px;
}


/* ========================================================================
   BEGIN: Breadcrumbs
   ======================================================================== */
.breadcrumbs {
    margin-bottom: var(--section-gap);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.breadcrumbs__list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 0;
    margin: 0;
    gap: 4px;
}

.breadcrumbs__item {
    display: inline-flex;
    align-items: center;
}

.breadcrumbs__item + .breadcrumbs__item::before {
    content: '›';
    margin: 0 6px;
    color: #bbb;
    font-size: 0.9rem;
}

.breadcrumbs__item a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition);
}

.breadcrumbs__item a:hover {
    color: var(--color-primary);
}

.breadcrumbs__item--current {
    color: var(--color-text);
    font-weight: 500;
}
/* END: Breadcrumbs */


/* ========================================================================
   BEGIN: Product Main Section (Галерея + Инфо с характеристиками)
   ======================================================================== */
.product-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: var(--section-gap);
}

/* --- Галерея (левая колонка) --- */
.product-gallery {
    width: 100%;
}

/* Вкладки галереи */
.gallery-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--color-border);
    margin-bottom: 14px;
}

.gallery-tab {
    background: none;
    border: none;
    padding: 9px 18px;
    font-size: 0.9rem;
    font-family: var(--font-family);
    color: var(--color-text-light);
    cursor: pointer;
    position: relative;
    transition: color var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}

.gallery-tab:hover {
    color: var(--color-primary);
}

.gallery-tab--active {
    color: var(--color-primary);
    font-weight: 600;
    border-bottom-color: var(--color-primary);
}

/* Панели галереи */
.gallery-panel {
    display: none;
}

.gallery-panel--active {
    display: block;
}

.gallery-main-image {
    position: relative;
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg);
    aspect-ratio: 1 / 1;
    cursor: zoom-in;
    margin: 0;
}

.gallery-main-image .gallery-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.gallery-main-image:hover .gallery-img {
    transform: scale(1.02);
}

/* Миниатюры */
.gallery-thumbs {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.gallery-thumb {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    padding: 0;
    background: none;
    transition: border-color var(--transition), opacity var(--transition);
    opacity: 0.7;
}

.gallery-thumb:hover {
    opacity: 1;
}

.gallery-thumb--active {
    border-color: var(--color-primary);
    opacity: 1;
}

.gallery-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Видео-панель */
.gallery-main-video {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #000;
}

.gallery-main-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Видео-миниатюры — пропорции 4:3 */
.gallery-thumbs--video .gallery-thumb--video {
    width: 80px;
    height: 60px;
}

/* --- Подпись под фото (alt активного изображения) --- */
.gallery-image-caption {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted, #6c757d);
    text-align: center;
    font-style: italic;
    min-height: 1.2em;
}

/* --- Информация о товаре (правая колонка) --- */
.product-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-info__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.3;
    margin-bottom: 0;
}

.product-info__article {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-primary);
}

.product-info__label {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.product-info__value {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 0.5px;
}

.product-info__meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.product-info__row {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.product-info__row .product-info__label {
    min-width: 90px;
    flex-shrink: 0;
}

.product-info__link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.product-info__link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.product-info__short-desc {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.6;
    margin: 0;
}

/* --- Характеристики внутри правой колонки --- */
.product-info__specs {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 14px 16px;
}

.product-info__specs-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.specs-list--inline {
    margin: 0;
    padding: 0;
}

.specs-list--inline .specs-list__row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 6px 0;
    border-bottom: 1px solid var(--color-border);
    gap: 12px;
}

.specs-list--inline .specs-list__row:last-child {
    border-bottom: none;
}

.specs-list__term {
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.9rem;
}

.specs-list__value {
    color: var(--color-text);
    font-size: 0.9rem;
    text-align: right;
    margin: 0;
}

/* CTA-кнопка */
.product-info__cta {
    margin-top: 4px;
}

.btn--primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 13px 28px;
    background: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: background var(--transition), transform 0.1s ease;
    border: 2px solid var(--color-primary);
    cursor: pointer;
    text-align: center;
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.btn--primary:active {
    transform: scale(0.98);
}

.btn--outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 28px;
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all var(--transition), transform 0.1s ease;
    cursor: pointer;
    text-align: center;
}

.btn--outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn--outline:active {
    transform: scale(0.98);
}
/* END: Product Main Section */


/* ========================================================================
   BEGIN: Общие стили заголовков секций
   ======================================================================== */
.product-section-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-dark);
    /*
     * margin-bottom = 0: расстояние между блоками задаёт --section-gap
     * на уровне секции (п. 3.7 ТЗ). Внутренний отступ от заголовка до
     * контента — через padding-bottom (10px воздуха + 3px линия).
     */
    margin-bottom: 0;
    padding-bottom: 10px;
    position: relative;
}

.product-section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--color-primary);
}
/* END: Заголовки секций */


/* ========================================================================
   BEGIN: Описание ткани
   ======================================================================== */
.product-description {
    margin-bottom: var(--section-gap);
}

.product-description__content {
    max-width: 800px;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text);
}

.product-description__content p {
    margin: 0 0 14px 0;
}

.product-description__content h3 {
    margin: 20px 0 10px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.product-description__content h3:first-child {
    margin-top: 0;
}

.product-description__content ul {
    margin: 0 0 14px 0;
    padding-left: 20px;
    list-style-type: disc;
}

.product-description__content p + ul {
    margin-top: -8px;
}

.product-description__content li {
    margin: 4px 0;
    line-height: 1.6;
}

.product-description__content li:first-child {
    margin-top: 0;
}

.product-description__content li:last-child {
    margin-bottom: 0;
}

.product-advantages {
    margin: 16px 0;
    padding: 16px 20px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.product-advantages p {
    margin-bottom: 8px;
    font-weight: 600;
}

.product-advantages ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-advantages li {
    padding: 3px 0;
    padding-left: 8px;
}

/* Дисклеймер о цветопередаче */
.product-description__disclaimer {
    margin-top: 4px;
    padding: 12px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-light);
    font-style: italic;
    line-height: 1.5;
}
/* END: Описание */


/* ========================================================================
   BEGIN: Ткани-компаньоны (карусель)
   ======================================================================== */
.product-companions {
    margin-bottom: var(--section-gap);
}

.companions-carousel {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}

.companions-track {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    padding: 6px 4px;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-bg);
}

.companions-track::-webkit-scrollbar {
    height: 5px;
}

.companions-track::-webkit-scrollbar-track {
    background: var(--color-bg);
    border-radius: 3px;
}

.companions-track::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 3px;
}

.companion-card {
    flex: 0 0 auto;
    width: 180px;
    scroll-snap-align: start;
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-white);
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.companion-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.companion-card__image {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background: var(--color-bg);
}

.companion-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.companion-card:hover .companion-card__image img {
    transform: scale(1.05);
}

.companion-card__info {
    padding: 10px;
}

.companion-card__name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 3px;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.companion-card__article {
    font-size: 0.78rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 3px;
}

.companion-card__meta {
    font-size: 0.72rem;
    color: var(--color-text-light);
    margin: 0;
}

/* Кнопки карусели */
.carousel-btn {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-white);
    color: var(--color-text);
    font-size: 1.3rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    z-index: 2;
}

.carousel-btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.carousel-btn:disabled {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}
/* END: Ткани-компаньоны */


/* ========================================================================
   BEGIN: Похожие товары (сетка)
   ======================================================================== */
.product-similar {
    margin-bottom: var(--section-gap);
}

.similar-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.similar-card {
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-white);
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.similar-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.similar-card__image {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background: var(--color-bg);
}

.similar-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.similar-card:hover .similar-card__image img {
    transform: scale(1.05);
}

.similar-card__info {
    padding: 10px;
}

.similar-card__name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 3px;
    line-height: 1.3;
}

.similar-card__article {
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 500;
    margin: 0;
}
/* END: Похожие товары */


/* ========================================================================
   BEGIN: Модальные окна
   ======================================================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal[hidden] {
    display: none;
}

.modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(2px);
}

.modal__content {
    position: relative;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 460px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.25s ease;
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal__close {
    position: absolute;
    top: 10px;
    right: 14px;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--color-text-light);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color var(--transition);
}

.modal__close:hover {
    color: var(--color-dark);
}

.modal__title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 6px;
    padding-right: 30px;
}

.modal__subtitle {
    font-size: 0.88rem;
    color: var(--color-text-light);
    margin-bottom: 16px;
}

.modal__form .form-group {
    margin-bottom: 14px;
    text-align: left;
}

.modal__form .form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-dark);
}

.modal__form .form-group input,
.modal__form .form-group textarea {
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-family);
    transition: border-color var(--transition);
}

.modal__form .form-group input:focus,
.modal__form .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.15);
}

.modal__submit {
    width: 100%;
    margin-top: 6px;
}
/* END: Модальные окна */


/* ========================================================================
   BEGIN: Lightbox
   ======================================================================== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox[hidden] {
    display: none;
}

.lightbox__close {
    position: absolute;
    top: 14px;
    right: 18px;
    background: none;
    border: none;
    color: white;
    font-size: 2.5rem;
    cursor: pointer;
    z-index: 10;
    line-height: 1;
    opacity: 0.7;
    transition: opacity var(--transition);
}

.lightbox__close:hover {
    opacity: 1;
}

.lightbox__prev,
.lightbox__next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    font-size: 3rem;
    cursor: pointer;
    width: 48px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    z-index: 10;
    transition: background var(--transition);
}

.lightbox__prev { left: 10px; }
.lightbox__next { right: 10px; }

.lightbox__prev:hover,
.lightbox__next:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox__figure {
    max-width: 90vw;
    max-height: 85vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox__img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.lightbox__caption {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.88rem;
    margin-top: 10px;
    text-align: center;
}
/* END: Lightbox */


/* ========================================================================
   RESPONSIVE: Планшет (768px+)
   ======================================================================== */
@media (min-width: 768px) {
    .product-main {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .product-info__title {
        font-size: 1.7rem;
    }

    .similar-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .companion-card {
        width: 200px;
    }
}


/* ========================================================================
   RESPONSIVE: Десктоп (1024px+)
   ======================================================================== */
@media (min-width: 1024px) {
    .product-main {
        gap: 40px;
    }

    /* H2 font-size на десктопе: 1.5rem */
    :root {
        --section-gap: 0.5rem;
    }

    .product-info__title {
        font-size: 1.9rem;
    }

    .similar-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .companion-card {
        width: 220px;
    }

    .product-section-title {
        font-size: 1.5rem;
    }
}


/* ========================================================================
   RESPONSIVE: Крупный десктоп (1200px+)
   ======================================================================== */
@media (min-width: 1200px) {
    .product-gallery {
        position: sticky;
        top: 90px;
        align-self: start;
    }
}


/* ========================================================================
   RESPONSIVE: Мобильные (< 576px)
   ======================================================================== */
@media (max-width: 576px) {
    .product-page {
        padding-top: 8px;
        padding-bottom: 20px;
    }

    .product-info__title {
        font-size: 1.3rem;
    }

    .product-section-title {
        font-size: 1.2rem;
    }

    .gallery-thumb {
        width: 56px;
        height: 56px;
    }

    .specs-list--inline .specs-list__row {
        flex-direction: column;
        gap: 2px;
    }

    .specs-list__value {
        text-align: left;
    }

    .companion-card {
        width: 155px;
    }

    .carousel-btn {
        width: 32px;
        height: 32px;
        font-size: 1.1rem;
    }

    .modal__content {
        padding: 22px 18px;
    }

    .modal__title {
        font-size: 1.15rem;
    }

    .lightbox__prev,
    .lightbox__next {
        width: 38px;
        height: 56px;
        font-size: 2rem;
    }
}


/* ========================================================================
   RESPONSIVE: Очень маленькие экраны (< 375px)
   ======================================================================== */
@media (max-width: 375px) {
    .product-info__article {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }

    .product-info__row {
        flex-direction: column;
        gap: 2px;
    }

    .companion-card {
        width: 140px;
    }

    .btn--primary,
    .btn--outline {
        padding: 11px 18px;
        font-size: 0.9rem;
    }
}