/* Reset CSS cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Space Grotesk', sans-serif;
}

:root {
    --bg-color: #000000;
    --card-bg: #0a0a0a;
    --text-color: #ffffff;
    --text-muted: #71717a;
    --accent-color: #00FF66; /* Màu xanh Neon */
    --border-color: #27272a;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
}

/* Hiệu ứng Marquee Chạy chữ */
.marquee-container {
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
    padding: 12px 0;
    overflow: hidden;
    white-space: nowrap;
    display: flex;
}

.marquee-text {
    display: inline-block;
    font-weight: 900;
    font-size: 12px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-color);
    animation: marqueeAnimation 20s linear infinite;
}

@keyframes marqueeAnimation {
    0% { transform: translateX(0%); }
    100% { transform: translateX(-50%); }
}

/* Layout chính */
.main-container {
    max-w: 1280px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* Hero Header */
.hero-header {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 32px;
    margin-bottom: 48px;
}

@media (min-width: 768px) {
    .hero-header { flex-direction: row; align-items: flex-end; }
}

.brand-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.03em;
}

@media (min-width: 768px) { .brand-title { font-size: 4.5rem; } }

.accent-text { color: var(--accent-color); }
.brand-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    margin-top: 16px;
}

.brand-contact a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}
.brand-contact a:hover { color: var(--text-color); }

/* Bộ lọc Filter Tags */
.filter-section {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.tag-buttons-container {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag-btn {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tag-btn:hover { border-color: var(--text-color); }
.tag-btn.active {
    background-color: var(--accent-color);
    color: #000000;
    border-color: var(--accent-color);
}

/* Grid Sản Phẩm */
.product-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 640px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .product-grid { grid-template-columns: repeat(3, 1fr); } }

/* Thẻ Sản phẩm (Product Card) */
.product-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.3s;
}
.product-card:hover { border-color: var(--text-color); }

.img-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background-color: #121212;
}

.product-img {
    width: 100%;
    height: 100%;
    object-cover: cover;
    transition: transform 0.5s ease;
}
.product-card:hover .product-img { transform: scale(1.03); }

.status-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 10px;
    font-weight: 900;
    padding: 4px 8px;
    letter-spacing: 0.05em;
}
.status-available { background-color: var(--accent-color); color: #000000; }
.status-sold { background-color: var(--border-color); color: var(--text-muted); text-decoration: line-through; }

.product-info {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-tags {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.product-title {
    font-size: 18px;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.product-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 16px;
}

.product-meta {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid #121212;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.product-price { font-size: 18px; font-weight: 900; }

.buy-btn {
    background-color: var(--text-color);
    color: #000000;
    text-decoration: none;
    font-size: 12px;
    font-weight: 900;
    padding: 10px 18px;
    transition: all 0.2s;
}
.buy-btn:hover { background-color: var(--accent-color); transform: translateY(-2px); }

.disabled-btn {
    background-color: #121212;
    color: var(--text-muted);
    cursor: not-allowed;
    pointer-events: none;
}

/* Footer */
.main-footer {
    border-top: 1px solid var(--border-color);
    padding: 32px;
    text-align: center;
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 0.2em;
    margin-top: 64px;
}