body {
    background-color: #0d0d0d;
    color: #ffffff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}

/* Header & Nav */
header {
    background: #1a1a1a;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #00ffcc; /* Neon accent */
}

header h1 { margin: 0; color: #00ffcc; text-transform: uppercase; letter-spacing: 2px; }

nav a {
    color: #fff;
    text-decoration: none;
    margin-left: 20px;
    font-weight: bold;
    transition: 0.3s;
}

nav a:hover { color: #00ffcc; text-shadow: 0 0 10px #00ffcc; }

/* Product Grid */
.product-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 40px;
}

.product-card {
    background: #1f1f1f;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 15px rgba(0, 255, 204, 0.5);
    border-color: #00ffcc;
}

.product-card img { max-width: 100%; border-radius: 5px; }
.product-card h3 { font-size: 18px; margin: 15px 0; }
.product-card .price { color: #ff0055; font-size: 20px; font-weight: bold; }

.btn-buy {
    background: transparent;
    color: #00ffcc;
    border: 2px solid #00ffcc;
    padding: 10px 20px;
    cursor: pointer;
    font-weight: bold;
    border-radius: 4px;
    margin-top: 15px;
    transition: 0.3s;
}
.btn-auth {
    border: 1px solid #00ffcc;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.3s ease;
}
.btn-auth:hover {
    background: rgba(0, 255, 204, 0.2);
    box-shadow: 0 0 10px rgba(0, 255, 204, 0.4);
}
.btn-buy:hover { background: #00ffcc; color: #000; }

/* Footer */
footer {
    background: #111;
    text-align: center;
    padding: 20px;
    border-top: 1px solid #333;
    margin-top: 50px;
}