* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: Arial, sans-serif; background: #f5f5f5; }

/* NAVBAR */
.navbar {
    background: #1b5e20;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.navbar-logo {
    color: white;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
}
.navbar-right { display: flex; gap: 8px; }
.btn-nav-outline {
    background: rgba(255,255,255,0.15);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 7px 14px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
}
.btn-nav-outline:hover { background: rgba(255,255,255,0.25); }
.btn-nav-white {
    background: white;
    color: #1b5e20;
    border: none;
    padding: 7px 14px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    font-weight: bold;
}
.btn-nav-white:hover { background: #f1f8e9; }

/* BANNER */
.banner {
    background: #1b5e20;
    color: white;
    padding: 24px 16px;
    text-align: center;
}
.banner h1 { font-size: 22px; margin-bottom: 6px; }
.banner p { font-size: 14px; opacity: 0.9; }

/* SEARCH */
.search-box {
    padding: 12px 16px;
    background: white;
    border-bottom: 1px solid #eee;
}
.search-box input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 15px;
}
.search-box input:focus { outline: none; border-color: #1b5e20; }

/* CONTAINER */
.container { max-width: 600px; margin: 0 auto; padding: 16px; }
.section-title {
    font-size: 16px;
    font-weight: bold;
    color: #333;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid #1b5e20;
}

/* GRID SẢN PHẨM */
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}
.product-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: transform 0.15s, box-shadow 0.15s;
}
.product-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.product-item img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    background: white;
}
.no-image {
    width: 100%;
    height: 150px;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #bbb;
    font-size: 13px;
}
.product-info { padding: 10px; }
.product-name {
    font-size: 13px;
    font-weight: bold;
    color: #333;
    margin-bottom: 6px;
    line-height: 1.3;
}
.product-price-retail {
    font-size: 11px;
    color: #999;
    text-decoration: line-through;
    margin-bottom: 2px;
}
.product-price-support {
    font-size: 15px;
    font-weight: bold;
    color: #c62828;
}
.product-badge {
    display: inline-block;
    background: #fff3e0;
    color: #e65100;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    margin-top: 4px;
}
.loading, .empty {
    text-align: center;
    padding: 40px;
    color: #aaa;
    grid-column: 1 / -1;
}