* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f6f8;
    color: #333;
}

/* Header */
header {
    background-color: #0f1923;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00a8e8;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
}

nav a:hover {
    color: #00a8e8;
}

#auth-btn {
    background-color: #00a8e8;
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
}

/* Product Grid */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    margin-bottom: 1.5rem;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    padding: 1rem;
    background: #fff;
}

.card-body {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.card-desc {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.btn-amazon {
    display: block;
    text-align: center;
    background-color: #ff9900;
    color: #111;
    text-decoration: none;
    padding: 0.6rem;
    font-weight: bold;
    border-radius: 4px;
}

.btn-amazon:hover {
    background-color: #e68a00;
}

/* Modals & Admin Panel */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
}

.modal-content, .admin-content {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
}

.hidden { display: none !important; }

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

form input, form select, form textarea {
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

form button {
    background: #00a8e8;
    color: white;
    border: none;
    padding: 0.7rem;
    cursor: pointer;
    border-radius: 4px;
}

.admin-panel {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
}

.logout-btn {
    margin-top: 1rem;
    background: #dc3545;
    color: white;
    border: none;
    padding: 0.5rem;
    width: 100%;
    cursor: pointer;
    border-radius: 4px;
}