:root {
    --brand: #1c2b3a;
    --accent: #c0392b;
    --text: #1c1c1c;
    --muted: #666666;
    --border: #e2e2e2;
    --bg: #ffffff;
    --danger: #c0392b;
    --success: #1e8449;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

.promo-bar {
    background: var(--accent);
    color: #fff;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 12px;
    letter-spacing: 0.02em;
}

.site-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 14px 24px;
    border-bottom: 3px solid var(--accent);
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
    flex-wrap: wrap;
}

.brand {
    font-weight: 800;
    font-size: 1.35rem;
    color: var(--brand);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.main-nav { display: flex; gap: 14px; flex-wrap: wrap; flex: 1; }
.main-nav a, .header-actions a { color: var(--text); text-decoration: none; font-weight: 500; }
.main-nav a:hover, .header-actions a:hover { color: var(--accent); }

.header-actions { display: flex; gap: 16px; margin-left: auto; align-items: center; }
.cart-link {
    font-weight: 700;
    background: var(--accent);
    color: #fff !important;
    padding: 6px 14px;
    border-radius: 20px;
}
.cart-link:hover { opacity: 0.9; color: #fff !important; }

.lang-switch { display: flex; gap: 6px; font-size: 0.85rem; }
.lang-switch a { padding: 2px 6px; border-radius: 4px; border: 1px solid var(--border); }
.lang-switch a.active { background: var(--brand); color: #fff !important; border-color: var(--brand); }

.site-main { padding: 20px 24px; max-width: 1100px; margin: 0 auto; }
.site-footer { padding: 24px; color: var(--muted); text-align: center; background: var(--brand); color: #cfd8e3; }
.site-footer p { margin: 0; color: #cfd8e3; }

.hero {
    margin-bottom: 24px;
    padding: 28px 24px;
    border-radius: 12px;
    background: linear-gradient(120deg, var(--brand), #24374a);
    color: #fff;
}
.hero h1 { margin: 0 0 8px; font-size: 1.6rem; }
.hero p { color: #d8dee6; margin: 0; }

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.product-card {
    display: block;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    text-decoration: none;
    color: var(--text);
    background: #fff;
    transition: box-shadow 0.15s, transform 0.15s;
}
.product-card:hover { box-shadow: 0 6px 18px rgba(28,43,58,0.12); transform: translateY(-2px); }

.product-card-wrap { display: flex; flex-direction: column; gap: 6px; }

.consult-widget { font-size: 0.85rem; }
.consult-toggle {
    background: transparent;
    color: var(--brand);
    border: 1px solid var(--brand);
    padding: 5px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    width: 100%;
}
.consult-toggle:hover { opacity: 1; background: var(--brand); color: #fff; }
.consult-box { margin-top: 6px; padding: 8px; border: 1px solid var(--border); border-radius: 6px; background: #fafafa; }
.consult-form { display: flex; gap: 6px; }
.consult-form input { flex: 1; padding: 6px 8px; border: 1px solid var(--border); border-radius: 4px; font-size: 0.85rem; }
.consult-form button { padding: 6px 10px; font-size: 0.85rem; }
.consult-thanks { color: var(--success); margin: 4px 0 0; font-size: 0.82rem; }

.product-thumb {
    background: var(--brand);
    color: #fff;
    height: 140px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
    overflow: hidden;
}
.product-thumb img { width: 100%; height: 100%; object-fit: cover; }

.product-name { font-weight: 600; margin-bottom: 4px; }
.product-price { color: var(--accent); font-weight: 700; }
.product-stock.in-stock { color: var(--success); font-size: 0.85rem; }
.product-stock.out-stock { color: var(--danger); font-size: 0.85rem; }

.sale-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 6px;
}

.variant-table, .cart-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}
.variant-table th, .variant-table td,
.cart-table th, .cart-table td {
    border-bottom: 1px solid var(--border);
    padding: 8px 10px;
    text-align: left;
}

.inline-form { display: inline-flex; gap: 6px; align-items: center; margin: 0; }

.out-stock { color: var(--danger); }
.warning { color: #b9770e; font-size: 0.8rem; }
.error { color: var(--danger); font-weight: 600; }

.cart-total { font-size: 1.1rem; margin: 12px 0; }

.btn-primary, button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 600;
}
.btn-primary:hover, button:hover { opacity: 0.9; }

.checkout-form { display: flex; flex-direction: column; gap: 12px; max-width: 480px; }
.checkout-form label { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; }
.checkout-form input, .checkout-form textarea {
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 1rem;
}

.payment-options { display: flex; flex-direction: column; gap: 8px; border: 1px solid var(--border); border-radius: 6px; padding: 10px; }
.payment-options label { flex-direction: row !important; align-items: center; gap: 8px !important; font-size: 0.95rem; }
.payment-discount { color: var(--success); font-weight: 600; font-size: 0.85rem; }

.color-swatches { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.color-swatch {
    width: 56px;
    height: 56px;
    border-radius: 8px;
    border: 2px solid var(--border);
    overflow: hidden;
    cursor: pointer;
    background: var(--brand);
    padding: 0;
}
.color-swatch img { width: 100%; height: 100%; object-fit: cover; }
.color-swatch.selected { border-color: var(--accent); }

.size-options { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.size-option {
    min-width: 44px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    text-align: center;
}
.size-option.selected { border-color: var(--accent); color: var(--accent); font-weight: 700; }
.size-option[disabled] { color: var(--muted); text-decoration: line-through; cursor: not-allowed; opacity: 0.5; }

.product-main-image { width: 100%; max-width: 420px; border-radius: 10px; overflow: hidden; background: var(--brand); margin-bottom: 12px; }
.product-main-image img { width: 100%; display: block; }

.vietqr-box { text-align: center; margin: 16px 0; }
.vietqr-box img { max-width: 280px; border: 1px solid var(--border); border-radius: 8px; }