/* Base Styles */
body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: #f3f4f6;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Header Navbar */
header {
    width: 100%;
    background-color: #111827;
    color: white;
    padding: 1rem 2rem;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
header a {
    color: #9ca3af;
    text-decoration: none;
    font-weight: bold;
}
header a:hover { color: white; }

/* Main Container (Card UI) */
.container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-top: 3rem;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

/* Forms & Inputs */
input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0 20px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    box-sizing: border-box;
}

/* Buttons */
button, .btn {
    background-color: #3b82f6;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    width: 100%;
    text-decoration: none;
    display: inline-block;
    box-sizing: border-box;
    transition: background-color 0.2s;
}
button:hover, .btn:hover { background-color: #2563eb; }
.btn-secondary { background-color: #6b7280; margin-top: 10px; }
.btn-secondary:hover { background-color: #4b5563; }

/* Product Image */
.product-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
}