/* ==========================================================================
   1. Глобальные стили и переменные
   ========================================================================== */
:root {
    --primary-color: #4A90E2; /* Мягкий синий */
    --dark-text: #333;
    --light-text: #777;
    --background-color: #f8f9fa;
    --white-color: #ffffff;
    --border-color: #dee2e6;
    --font-main: 'Lato', sans-serif;
    --font-headings: 'Montserrat', sans-serif;
    --container-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    color: var(--dark-text);
    background-color: var(--white-color);
    line-height: 1.6;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

a:hover {
    color: #3a75c4;
}

h1, h2, h3 {
    font-family: var(--font-headings);
    font-weight: 600;
}

section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 50px;
    color: var(--dark-text);
}

/* ==========================================================================
   2. Компоненты (Шапка, подвал, кнопки, мобильное меню)
   ========================================================================== */

/* --- Кнопки --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 25px;
    font-weight: 700;
    text-align: center;
    transition: all 0.3s ease;
}
.btn-primary {
    background-color: var(--primary-color);
    color: var(--white-color);
    border: 2px solid var(--primary-color);
}
.btn-primary:hover {
    background-color: var(--white-color);
    color: var(--primary-color);
}
.btn-secondary {
    background-color: var(--white-color);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}
.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
}
.btn-large {
    padding: 15px 35px;
    font-size: 1.2rem;
    width: 100%;
}
.btn-large .fa-solid {
    margin-right: 10px;
}

/* --- Шапка --- */
.header {
    background-color: var(--white-color);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-family: var(--font-headings);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-text);
}
.main-nav ul {
    list-style: none;
    display: flex;
    gap: 25px;
}
.main-nav a {
    color: var(--dark-text);
    font-weight: 700;
    font-size: 1rem;
    position: relative;
    padding-bottom: 5px;
}
.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}
.main-nav a:hover::after {
    width: 100%;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}
.header-phone {
    font-weight: 700;
    color: var(--dark-text);
}
.cart-icon {
    font-size: 1.5rem;
}
.burger-menu {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--dark-text);
}

/* --- Мобильное меню --- */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1001;
}
.mobile-nav.active {
    display: block;
}
.mobile-nav-content {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 300px;
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 20px;
    text-align: left;
}
.mobile-nav ul {
    list-style: none;
    text-align: left;
    margin-bottom: 20px;
}
.mobile-nav li {
    margin-bottom: 15px;
}
.mobile-nav a {
    font-size: 1.2rem;
    color: var(--dark-text);
    font-family: var(--font-headings);
}
.close-btn {
    display: block;
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 2.2rem;
    color: var(--light-text);
    background: none;
    border: none;
    cursor: pointer;
}
.close-btn:hover {
    color: var(--dark-text);
}
.mobile-phone {
    display: block;
    margin-top: 20px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark-text);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

/* --- Подвал --- */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding-top: 50px;
}
.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col .logo {
    color: var(--white-color);
    margin-bottom: 15px;
    display: inline-block;
}
.footer-text {
    color: #bdc3c7;
}
.footer-col h4 {
    margin-bottom: 15px;
    font-family: var(--font-headings);
    font-size: 1.1rem;
    color: var(--white-color);
}
.footer-col ul {
    list-style: none;
}
.footer-col li {
    margin-bottom: 10px;
}
.footer-col a, .footer-col p {
    color: #bdc3c7;
}
.footer-col a:hover {
    color: var(--white-color);
}
.footer-bottom {
    border-top: 1px solid #34495e;
    text-align: center;
    padding: 20px 0;
    color: #95a5a6;
}

/* ==========================================================================
   3. Стили для секций главной страницы
   ========================================================================== */
.hero {
    background: linear-gradient(rgba(10, 30, 60, 0.6), rgba(10, 30, 60, 0.6)), url('https://images.unsplash.com/photo-1576091160550-2173dba9996a?q=80&w=2070&auto=format&fit=crop') no-repeat center center;
    background-size: cover;
    color: var(--white-color);
    display: flex;
    align-items: center;
    min-height: 550px;
    padding: 80px 0;
}
.hero-content {
    max-width: 650px;
    text-align: left;
}
.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}
.hero .subtitle {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 550px;
}

.advantages {
    background-color: var(--background-color);
}
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    text-align: center;
}
.advantage-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}
.advantage-item h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.popular-categories {
    padding-top: 60px;
    padding-bottom: 60px;
}
.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.category-card {
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    display: block;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}
.category-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.category-card .category-title {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: var(--white-color);
    padding: 20px;
    font-size: 1.4rem;
    font-family: var(--font-headings);
}

.how-it-works {
    background-color: var(--background-color);
    padding-top: 60px;
    padding-bottom: 60px;
}
.steps-container {
    display: flex;
    justify-content: space-between;
    gap: 40px;
}
.step {
    flex: 1;
    text-align: center;
    padding: 20px;
}
.step-number {
    width: 60px;
    height: 60px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-headings);
}
.step h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

/* ==========================================================================
   4. Стили для страниц каталога и категорий
   ========================================================================== */
.catalog-page, .category-page {
    padding: 20px 0 60px;
}
.breadcrumbs {
    padding-bottom: 20px;
    font-size: 0.9rem;
    color: var(--light-text);
}
.breadcrumbs a {
    color: var(--primary-color);
}
.breadcrumbs span {
    color: var(--dark-text);
}

.catalog-header, .category-header {
    margin-bottom: 40px;
}
.catalog-title, .category-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
}
.catalog-description, .category-description {
    font-size: 1.1rem;
    line-height: 1.7;
    max-width: 800px;
    color: var(--dark-text);
}
.catalog-header {
    text-align: center;
}
.catalog-description {
    margin: 0 auto;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}
.category-card-large {
    display: flex;
    flex-direction: column;
    background-color: var(--white-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
}
.category-card-large:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}
.category-card-large img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}
.category-card-large .card-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}
.category-card-large h3 {
    font-size: 1.4rem;
    color: var(--dark-text);
    margin-bottom: 10px;
}
.category-card-large p {
    color: var(--light-text);
    font-size: 1rem;
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: 20px;
}
.category-card-large .btn {
    width: 100%;
}
.category-card-large.is-disabled {
    opacity: 0.6;
    pointer-events: none;
}
.category-card-large.is-disabled .btn {
    background-color: #ccc;
    border-color: #ccc;
    color: #666;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 30px;
}
.product-card {
    background-color: var(--white-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}
.product-card img {
    width: 100%;
    height: 250px;
    object-fit: contain;
    padding: 10px;
}
.product-card .product-name {
    font-size: 1.2rem;
    color: var(--dark-text);
    margin: 15px 15px 5px;
}
.product-card .product-link:hover .product-name {
    color: var(--primary-color);
}
.product-card .product-desc {
    font-size: 0.9rem;
    color: var(--light-text);
    margin: 0 15px 15px;
    flex-grow: 1;
}
.product-card .product-price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 15px;
}
.product-card .btn {
    margin: 0 15px 20px;
}

/* ==========================================================================
   5. Стили для страницы товара
   ========================================================================== */
.product-page {
    padding-top: 20px;
}
.product-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.product-gallery #main-product-image {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
}
.product-thumbnails {
    display: flex;
    gap: 10px;
}
.product-thumbnails .thumbnail-item {
    width: 80px;
    height: 80px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}
.product-thumbnails .thumbnail-item:hover,
.product-thumbnails .thumbnail-item.active {
    border-color: var(--primary-color);
}

.product-details h1 {
    font-size: 2.5rem;
    margin-bottom: 5px;
}
.product-details .product-subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    margin-bottom: 15px;
}
.product-details .product-sku {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 30px;
}

.selector-title {
    font-weight: 700;
    margin-bottom: 10px;
}
.size-selector .size-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
}
.size-option {
    flex: 1;
    min-width: 120px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.size-option:hover {
    border-color: #a0a0a0;
}
.size-option input[type="radio"] {
    display: none;
}
.size-option:has(input:checked) {
    border-color: var(--primary-color);
    background-color: #f0f8ff;
}
.size-option.is-single {
    flex-basis: 100%;
    max-width: 200px;
}
.size-option .option-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.size-option .option-content strong {
    font-size: 1.1rem;
}
.size-option .option-content span {
    color: var(--light-text);
    font-size: 0.9rem;
}

.quantity-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
}
.quantity-selector .quantity-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background: var(--white-color);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
}
.quantity-selector #quantity-input {
    width: 60px;
    height: 40px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
}

.product-benefits {
    margin-top: 30px;
    display: flex;
    justify-content: space-around;
    background: var(--background-color);
    padding: 15px;
    border-radius: 8px;
}
.benefit-item {
    color: var(--light-text);
}
.benefit-item .fa-solid {
    margin-right: 8px;
    color: var(--primary-color);
}

.product-info {
    margin-top: 60px;
}
.tabs-nav {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    white-space: nowrap;
}
.tabs-nav::-webkit-scrollbar {
    display: none;
}
.tab-btn {
    padding: 15px 25px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1.1rem;
    position: relative;
    color: var(--light-text);
    flex-shrink: 0;
}
.tab-btn.active {
    color: var(--dark-text);
    font-weight: 700;
}
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
}
.tabs-content .tab-pane {
    display: none;
    padding: 30px 0;
    line-height: 1.8;
}
.tabs-content .tab-pane.active {
    display: block;
}
.tabs-content table {
    width: 100%;
    border-collapse: collapse;
}
.tabs-content td {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
}
.tabs-content td:first-child {
    font-weight: bold;
    width: 30%;
}

/* ==========================================================================
   6. Стили для служебных страниц (Корзина, Доставка и т.д.)
   ========================================================================== */
.info-page, .cart-page {
    padding: 20px 0 60px;
}
.info-page h1, .cart-page h1 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.info-section {
    margin-bottom: 40px;
}
.info-section h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
}
.info-section h2 .fa-solid {
    margin-right: 15px;
    color: var(--primary-color);
}
.info-section p {
    line-height: 1.8;
    margin-bottom: 15px;
    max-width: 800px;
}
.styled-list {
    list-style-type: none;
    padding-left: 30px;
    max-width: 800px;
}
.styled-list li {
    position: relative;
    margin-bottom: 10px;
    line-height: 1.8;
}
.styled-list li::before {
    content: '\f058';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--primary-color);
    position: absolute;
    left: -30px;
    top: 5px;
}
.info-section table {
    width: 100%;
    max-width: 800px;
    border-collapse: collapse;
    margin: 20px 0;
}
.info-section th, .info-section td {
    border: 1px solid var(--border-color);
    padding: 15px;
    text-align: left;
}
.info-section thead {
    background-color: var(--background-color);
    font-family: var(--font-headings);
}
.info-box {
    background-color: #f0f8ff;
    border-left: 5px solid var(--primary-color);
    padding: 20px;
    border-radius: 0 8px 8px 0;
    margin-top: 40px;
    max-width: 800px;
}
.info-box h3 {
    margin-bottom: 10px;
}

.cart-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 40px;
}
.cart-table thead {
    border-bottom: 2px solid var(--border-color);
}
.cart-table th {
    text-align: left;
    padding: 15px 10px;
    font-family: var(--font-headings);
    color: var(--light-text);
    font-weight: normal;
}
.cart-table td {
    padding: 20px 10px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}
.cart-item-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}
.cart-item-details a {
    font-weight: bold;
    color: var(--dark-text);
    display: block;
    margin-bottom: 5px;
}
.cart-item-details a:hover {
    color: var(--primary-color);
}
.cart-item-details span {
    font-size: 0.9rem;
    color: var(--light-text);
}
.cart-quantity {
    display: flex;
    align-items: center;
    gap: 5px;
}
.cart-quantity .quantity-btn {
    width: 30px;
    height: 30px;
    font-size: 1rem;
}
.cart-quantity input {
    width: 40px;
    height: 30px;
    font-size: 1rem;
}
.cart-remove-btn {
    font-size: 1.2rem;
    color: var(--light-text);
}
.cart-remove-btn:hover {
    color: #e74c3c;
}

.cart-summary {
    float: right;
    width: 100%;
    max-width: 400px;
    background: var(--background-color);
    padding: 25px;
    border-radius: 8px;
}
.cart-summary h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}
.summary-row, .summary-total {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}
.summary-total {
    font-size: 1.2rem;
    font-weight: bold;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}
.cart-summary .btn {
    width: 100%;
    margin-top: 10px;
}

/* ==========================================================================
   7. Медиа-запросы (Адаптация)
   ========================================================================== */

/* --- Планшеты --- */
@media (max-width: 992px) {
    .main-nav, .header-actions {
        display: none;
    }
    .burger-menu {
        display: block;
    }
    .advantages-grid, .categories-grid {
        grid-template-columns: 1fr 1fr;
    }
    .advantages-grid .advantage-item:last-child {
        grid-column: 1 / -1;
    }
    .steps-container {
        flex-direction: column;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    .product-layout {
        grid-template-columns: 1fr;
    }
}

/* --- Смартфоны --- */
@media (max-width: 768px) {
    section {
        padding: 40px 0;
    }
    .section-title, .catalog-title, .category-title, .info-page h1, .cart-page h1, .product-details h1 {
        font-size: 2rem;
    }
    .category-description, .catalog-description {
        font-size: 1rem;
    }

    .hero {
        padding: 60px 0;
        text-align: center;
    }
    .hero-content {
        text-align: center;
    }
    .hero h1 {
        font-size: 2.2rem;
        word-wrap: break-word;
        hyphens: auto;
    }

    .advantages-grid, .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-col ul {
        padding-left: 0;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 15px;
    }
    .product-layout {
        gap: 20px;
    }
    .tabs-nav {
        margin-left: -15px;
        margin-right: -15px;
        padding-left: 15px;
    }
    .tab-btn {
        padding: 15px;
    }

    .cart-table thead {
        display: none;
    }
    .cart-table tr {
        display: block;
        margin-bottom: 20px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 10px;
    }
    .cart-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        border: none;
        padding: 10px 0;
    }
    .cart-table td::before {
        content: attr(data-label);
        font-weight: bold;
    }
    .cart-table td:first-child, .cart-table td:nth-child(2) {
        display: block;
        text-align: center;
    }
    .cart-item-image {
        margin: 0 auto 10px;
    }
    .cart-item-details {
        margin-bottom: 15px;
    }
    .cart-summary {
        float: none;
        max-width: none;
    }
}

/* --- Маленькие смартфоны --- */
@media (max-width: 500px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
}