/* переменные */
:root {
    --bg: #f7f9fb;
    --card: #ffffff;
    --primary: #0b74da;
    --muted: #6b7280;
    --radius: 12px;
    --container: 1200px;
    font-family: Inter, Roboto, -apple-system, "Segoe UI", Arial, sans-serif;
}

* {
    box-sizing: border-box
}

body {
    margin: 0;
    background: var(--bg);
    color: #0f172a
}

a {
    text-decoration: none;
    color: inherit
}

/* название, логотип, навигация */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 18px
}

header {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    backdrop-filter: blur(4px);
    position: sticky;
    top: 0;
    z-index: 40;
    border-bottom: 1px solid #e6eef8
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0
}

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

.logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 8px
}

.site-title {
    font-weight: 700;
    font-size: 18px
}

.sign {
    font-size: 12px;
    color: var(--muted)
}

/* основное меню */
nav {
    display: flex;
    gap: 16px;
    align-items: center
}

nav a {
    padding: 8px 10px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 600
}

nav a:hover {
    background: rgba(11, 116, 218, 0.08);
    color: var(--primary)
}

/* бургер для мобильных */
.burger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.burger span {
    width: 22px;
    height: 3px;
    background: #0f172a;
    border-radius: 2px;
}

/* мобильное меню */
.mobile-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    background: var(--card);
    padding: 12px;
    border-bottom: 1px solid #eef6ff
}

.mobile-nav a {
    display: block;
    padding: 8px 6px
}

.mobile-nav.show {
    display: block
}

/* анимация появления */
.fade-in {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 500ms ease, transform 500ms ease
}

.fade-in.visible {
    opacity: 1;
    transform: none
}

/* карточки товаров */
.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 20px 0
}

.card {
    background: var(--card);
    padding: 16px;
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05)
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    background: #fff;
    border-radius: 8px
}

.card h3 {
    margin: 10px 0 6px
}

.card p {
    margin: 0;
    color: var(--muted)
}

.tag {
    display: inline-block;
    margin-top: 6px;
    padding: 4px 10px;
    background: #e8f1ff;
    color: var(--primary);
    border-radius: 8px;
    font-size: 12px
}

/* цена и кнопка купить */
.priceBtn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

.priceBtn .price {
    font-weight: 600;
    font-size: 1.2rem;
}

.priceBtn .buy {
    padding: 6px 12px;
    font-weight: 600;
    background: var(--primary);
    border-radius: 6px;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: 0.2s;
}

.priceBtn .buy:hover {
    background: #e8f1ff;
    color: var(--muted);
}

/* фильтр */
.filter {
    margin: 20px 0;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.filter button {
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    background: #e8f1ff;
    color: var(--primary);
    cursor: pointer;
    font-weight: 600;
}

.filter button.active {
    background: var(--primary);
    color: #fff
}

/* адаптивность */
@media(max-width: 820px) {
    nav.main-nav {
        display: none;
    }

    .burger {
        display: flex;
    }

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

@media(max-width: 520px) {
    .products {
        grid-template-columns: 1fr;
    }
}