/* ==========================================================================
   1. СИСТЕМНІ НАЛАШТУВАННЯ ТА ЗМІННІ (CSS VARIABLES)
   ========================================================================== */
:root {
    --bg-main: #0a0c10;
    --bg-card: #131722;
    --bg-modal: rgba(19, 23, 34, 0.85);
    --accent-neon: #00ffcc;
    --accent-purple: #7000ff;
    --text-main: #f5f7fa;
    --text-muted: #8a99ad;
    --border-color: rgba(255, 255, 255, 0.08);
    --font-primary: 'Montserrat', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   2. ШАПКА САЙТУ (HEADER)
   ========================================================================== */
.header {
    background: rgba(10, 12, 16, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--text-main);
}

    .logo span {
        color: var(--accent-neon);
    }

.nav {
    display: flex;
    gap: 32px;
}

.nav__link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition-smooth);
}

    .nav__link:hover {
        color: var(--accent-neon);
    }

/* Стікі-кошик з лічильником */
.header__cart {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 10px 18px;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-smooth);
    position: relative;
}

    .header__cart:hover {
        border-color: var(--accent-neon);
        background: rgba(0, 255, 204, 0.05);
        box-shadow: 0 0 15px rgba(0, 255, 204, 0.2);
    }

.cart-icon {
    font-size: 18px;
}

.cart-badge {
    background: linear-gradient(135deg, var(--accent-purple), #b000ff);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 20px;
    min-width: 20px;
    text-align: center;
}

/* Складна мікро-анімація при додаванні в кошик */
@keyframes cartBounce {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2) rotate(-5deg);
    }

    100% {
        transform: scale(1);
    }
}

.cart-bounce {
    animation: cartBounce 0.3s ease-in-out;
}

/* ==========================================================================
   3. КАТАЛОГ ТОВАРІВ (PRODUCT GRID)
   ========================================================================== */
.catalog {
    padding: 80px 0;
}

.catalog__title {
    font-size: 36px;
    font-weight: 900;
    margin-bottom: 48px;
    text-align: center;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 30%, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.catalog__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

/* Высокотехнологичная карточка товара */
.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

    .product-card:hover {
        transform: translateY(-8px);
        border-color: rgba(0, 255, 204, 0.3);
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 255, 204, 0.05);
    }

.product-card__img-box {
    position: relative;
    width: 100%;
    padding-top: 65%; /* Идеальное соотношение сторон 16:10 */
    overflow: hidden;
    background: #000;
}

.product-card__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.85;
    transition: var(--transition-smooth);
}

.product-card:hover .product-card__image {
    transform: scale(1.05);
    opacity: 1;
}

.product-card__content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-card__category {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent-neon);
    margin-bottom: 8px;
}

.product-card__title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
}

.product-card__specs {
    font-size: 12px;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
    padding: 8px 12px;
    border-radius: 8px;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.product-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.product-card__price {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
}

.btn-add {
    background: var(--text-main);
    color: var(--bg-main);
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

    .btn-add:hover {
        background: var(--accent-neon);
        box-shadow: 0 0 15px rgba(0, 255, 204, 0.4);
    }

/* ==========================================================================
   4. МОДАЛЬНЕ ВІКНО КОШИКА (GLASSMORPHISM CHECKOUT OUTLET)
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 7, 10, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: flex-end;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

    .modal-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

.cart-modal {
    width: 100%;
    max-width: 480px;
    background: var(--bg-modal);
    border-left: 1px solid var(--border-color);
    height: 100%;
    padding: 40px;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .cart-modal {
    transform: translateX(0);
}

.cart-modal__close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 32px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

    .cart-modal__close:hover {
        color: #fff;
    }

.cart-modal__title {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

/* Список товаров внутри корзины */
.cart-modal__items {
    flex-grow: 1;
    overflow-y: auto;
    margin-bottom: 24px;
    padding-right: 8px;
}

.cart-empty {
    color: var(--text-muted);
    text-align: center;
    padding: 40px 0;
    font-size: 14px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.cart-item__title {
    font-size: 14px;
    font-weight: 600;
    max-width: 220px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cart-item__price {
    font-size: 13px;
    color: var(--accent-neon);
    display: block;
    margin-top: 4px;
}

.cart-item__controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-qty {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-smooth);
}

    .btn-qty:hover {
        background: rgba(255, 255, 255, 0.15);
    }

.cart-item__qty {
    font-size: 14px;
    font-weight: 700;
    min-width: 16px;
    text-align: center;
}

.btn-remove {
    background: none;
    border: none;
    color: #ef4444;
    font-size: 20px;
    cursor: pointer;
    padding: 0 4px;
    margin-left: 8px;
}

/* Оформление заказа и интеграция шлюзов */
.cart-modal__footer {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
}

#cart-total-price {
    color: var(--accent-neon);
    font-size: 22px;
    font-weight: 900;
}

.checkout-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-input, .form-select {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 14px 16px;
    border-radius: 8px;
    color: #fff;
    font-family: var(--font-primary);
    font-size: 14px;
    transition: var(--transition-smooth);
}

    .form-input:focus, .form-select:focus {
        outline: none;
        border-color: var(--accent-purple);
        box-shadow: 0 0 10px rgba(112, 0, 255, 0.2);
    }

    .form-select option {
        background: var(--bg-card);
        color: #fff;
    }

.btn-checkout {
    background: linear-gradient(135deg, var(--accent-purple), #5000b8);
    color: #fff;
    border: none;
    padding: 16px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-smooth);
    letter-spacing: 0.5px;
    box-shadow: 0 4px 20px rgba(112, 0, 255, 0.3);
}

    .btn-checkout:hover:not(:disabled) {
        transform: translateY(-2px);
        box-shadow: 0 6px 25px rgba(112, 0, 255, 0.5);
        background: linear-gradient(135deg, #8217ff, var(--accent-purple));
    }

    .btn-checkout:disabled {
        opacity: 0.6;
        cursor: not-allowed;
    }

/* ==========================================================================
   5. АДАПТИВНІСТЬ ДЛЯ МОБІЛЬНИХ ПРИСТРОЇВ (RESPONSIVE)
   ========================================================================== */
@media (max-width: 768px) {
    .header__inner {
        height: 70px;
    }

    .nav {
        display: none;
    }
    /* Скрываем текстовую навигацию для чистоты */
    .catalog__title {
        font-size: 28px;
    }

    .cart-modal {
        padding: 24px;
    }
}

/* ==========================================================================
   6. СЕКЦІЯ ПЕРЕВАГ (FEATURES)
   ========================================================================== */
.features {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--bg-main), #0f121a);
    border-top: 1px solid var(--border-color);
}

.features__title {
    font-size: 32px;
    font-weight: 900;
    margin-bottom: 48px;
    text-align: center;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 40%, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 16px;
    transition: var(--transition-smooth);
}

    .feature-card:hover {
        border-color: var(--accent-purple);
        transform: translateY(-4px);
        box-shadow: 0 10px 25px rgba(112, 0, 255, 0.1);
    }

.feature-card__icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.feature-card__title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card__text {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}