* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

/* Navigation */
.navbar {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover {
    background-color: #34495e;
}

.nav-menu a.active {
    background-color: #3498db;
}

.session-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
}

.session-info button {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.session-info button:hover {
    background-color: #c0392b;
}

/* Main Content */
#app {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.page {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.page h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.page p {
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.product-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.product-card h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.product-card .price {
    color: #27ae60;
    font-size: 1.2rem;
    font-weight: bold;
    margin: 0.5rem 0;
}

.product-card button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    margin-top: 0.5rem;
    transition: background-color 0.3s;
}

.product-card button:hover {
    background-color: #2980b9;
}

/* Cart */
.cart-items {
    margin-top: 1.5rem;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

.cart-total {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid #2c3e50;
    font-size: 1.5rem;
    font-weight: bold;
    text-align: right;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    margin-top: 1rem;
    background-color: #27ae60;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #229954;
}

.btn-primary {
    background-color: #3498db;
}

.btn-primary:hover {
    background-color: #2980b9;
}

/* Form */
.checkout-form {
    max-width: 500px;
    margin-top: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.beacon-log {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-left: 4px solid #3498db;
    border-radius: 4px;
}

.beacon-log h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.beacon-log pre {
    background-color: #fff;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 0.5rem;
}