:root {
    --color-bg-main: #eaf6fb;
    --color-bg-header: #23293a;
    --color-bg-footer: #23293a;
    --color-text-main: #1a2233;
    --color-text-link: #bbbec0;
    --color-text-link-hover: #7d9dbe;
    --color-text-header-footer: #ffffff;
    --color-accent-2: #0056b3;
    --color-accent-4: #0a3a5e;
    --color-card-shadow: rgba(0, 0, 0, 0.18);
    --color-card-border: #2e3a4d;
    --color-price: #0056b3;
    --color-available: #015705;
    --color-out-stock: #881205;

    --font-family-main: 'Segoe UI', Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2.5rem;
    --font-weight-normal: 500;
    --font-weight-bold: 700;
    --letter-spacing-logo: 1px;

    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 20px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-section: 40px;
    --space-page-side: 5vw;

    --border-radius-card: 12px;
    --border-radius-small: 8px;
    --border-width-card: 2px;
    --max-width-gallery: 1000px;

    --card-width: 18rem;
    --card-min-height: 24rem;
    --card-img-width: 15rem;
    --card-img-height: 11rem;
    --card-padding: 1.5rem;
    --card-gap: 2rem;
}

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

body {
    background: var(--color-bg-main);
    color: var(--color-text-main);
    font-family: var(--font-family-main);
    line-height: 1.5;
    min-height: 100vh;
    width: 100vw;
}

header {
    align-items: center;
    background: var(--color-bg-header);
    box-sizing: border-box;
    color: var(--color-text-header-footer);
    display: flex;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-page-side);
    width: 100vw;
}

.logo {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--letter-spacing-logo);
}

.menu {
    display: flex;
    gap: var(--space-xl);
}

@media (max-width: 600px) {
    .menu {
        gap: var(--space-xs);
    }
}

.menu a {
    color: var(--color-text-link);
    font-size: 1.1rem;
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: color 0.3s ease;
}

.menu a:hover {
    color: var(--color-text-link-hover);
}

em>a {
    color: var(--color-accent-2);
}

em>a:hover {
    color: var(--color-accent-4);
    font-weight: var(--font-weight-bold);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    box-sizing: border-box;
    flex: 1;
    min-block-size: 60vh;
    place-items: center;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(var(--card-width), 1fr));
    gap: var(--card-gap);
    justify-content: center;
}

@media (max-width: 1100px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 700px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background-color: var(--color-bg-main);
    border-radius: var(--border-radius-card);
    overflow: hidden;
    border: 1px solid var(--color-card-border);
    box-shadow: 0 2px 10px var(--color-card-shadow);
    transition: transform 0.3s ease;
    min-height: var(--card-min-height);
    width: var(--card-width);
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: var(--card-padding);
}

.card:hover {
    transform: translateY(-5px);
}

.card>img {
    width: var(--card-img-width);
    height: var(--card-img-height);
    object-fit: contain;
    display: block;
    margin: 0 auto 1rem auto;
    border-radius: var(--border-radius-small);
    background: #fff;
}

.card>h2 {
    padding: var(--card-padding) 1rem 2.5rem;
    font-size: 1.2rem;
    color: var(--color-accent-4);
    text-align: center;
}

.price {
    padding: 0.5rem 0;
    font-weight: var(--font-weight-bold);
    color: var(--color-price);
    font-size: 1.1rem;
    letter-spacing: 0.5px;
}

.status {
    padding: 0.5rem 0 1rem 0;
    color: var(--color-available);
    font-weight: var(--font-weight-bold);
    font-size: 1rem;
}

.out-of-stock {
    color: var(--color-out-stock);
    font-weight: var(--font-weight-bold);
    font-size: 1rem;
}

footer {
    align-items: center;
    background: var(--color-bg-footer);
    bottom: 0;
    box-sizing: border-box;
    color: var(--color-text-header-footer);
    display: flex;
    font-size: var(--font-size-base);
    justify-content: center;
    min-height: 3.5rem;
    padding: 1rem 0;
    position: fixed;
    width: 100vw;
    text-align: center;
}

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

a:hover {
    text-decoration: underline;
    transform: scale(0.95);
    transition: color 0.3s ease, transform 0.2s ease;
    color: var(--color-text-link-hover);
}

/* Acessibilidade: foco visível para links e botões */
a:focus,
button:focus,
.menu a:focus {
    outline: 2px solid var(--color-accent-4);
    outline-offset: 2px;
    background: var(--color-text-main);
}

/* Contraste para status indisponível */
.out-of-stock {
    color: var(--color-out-stock);
    background: var(--color-bg-main);
    border-radius: 4px;
    padding: 0.5rem 1rem 1rem;
}