/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; }
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* === Header === */
.header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}
.logo {
    font-size: 28px;
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.5px;
}
.tagline {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin: 5px 0 0;
}

/* === Container === */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

/* === Hero === */
.hero {
    text-align: center;
    padding: 30px 0 20px;
}
.hero h2 {
    font-size: 24px;
    color: #1a1a2e;
    margin: 0 0 8px;
}
.hero p {
    color: #666;
    font-size: 15px;
    margin: 0;
}

/* === Product List (Grid) === */
.product-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin: 20px 0;
}

/* === Product Card === */
.product-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #eee;
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.product-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}
.product-card-img {
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.product-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.product-card-img.placeholder {
    background: #f8f9fa;
    font-size: 48px;
    color: #ccc;
}
.product-card-body {
    padding: 16px;
}
.product-card-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: #222;
    margin: 0 0 6px;
    line-height: 1.4;
}
.prod-desc {
    font-size: 13px;
    color: #666;
    margin: 0 0 10px;
    line-height: 1.5;
}
.prod-price {
    font-size: 20px;
    font-weight: 700;
    color: #c0392b;
    margin: 0 0 8px;
}
.prod-price .old-price {
    font-size: 14px;
    color: #999;
    text-decoration: line-through;
    font-weight: 400;
    margin-left: 8px;
}
.prod-status {
    display: inline-block;
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 20px;
}
.prod-status.còn-hàng {
    background: #e8f5e9;
    color: #27ae60;
}

/* === Placeholder card === */
.product-card-placeholder .product-card-body h3 {
    color: #aaa;
}

/* === Footer === */
.footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.7);
    margin-top: 40px;
    padding: 30px 0 0;
}
.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}
.footer h4 {
    color: white;
    margin: 0 0 10px;
    font-size: 15px;
}
.footer p {
    font-size: 13px;
    margin: 4px 0;
    line-height: 1.6;
}
.copyright {
    text-align: center;
    padding: 20px;
    margin-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 13px;
}

/* === Responsive === */
@media (max-width: 600px) {
    .product-list {
        grid-template-columns: 1fr;
    }
    .logo { font-size: 22px; }
}