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

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #e8e8e8;
    color: #333;
    line-height: 1.6;
}

a {
    color: #2a5f8f;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    background-color: #fff;
    min-height: 100vh;
}

header {
    background-color: #1a3a5c;
    color: #fff;
    padding: 20px 30px;
}

header h1 {
    font-size: 24px;
    font-weight: normal;
}

header h1 a {
    color: #fff;
}

header h1 a:hover {
    text-decoration: none;
}

header p {
    font-size: 14px;
    color: #aac;
    margin-top: 5px;
}

nav {
    background-color: #2a5a8a;
    padding: 10px 30px;
}

nav a {
    color: #fff;
    margin-right: 20px;
    font-size: 14px;
    display: inline-block;
    padding: 3px 0;
}

nav a:hover {
    text-decoration: underline;
}

.wrapper {
    display: flex;
    min-height: 500px;
}

.sidebar {
    width: 200px;
    background-color: #f0f4f8;
    padding: 20px 15px;
    border-right: 1px solid #d0d8e0;
}

.sidebar h3 {
    font-size: 14px;
    color: #1a3a5c;
    margin-bottom: 10px;
    font-weight: bold;
}

.sidebar ul {
    list-style: none;
    margin-bottom: 20px;
}

.sidebar ul li {
    margin-bottom: 6px;
}

.sidebar ul li a {
    font-size: 13px;
}

.content {
    flex: 1;
    padding: 25px 30px;
}

.content h2 {
    font-size: 22px;
    color: #1a3a5c;
    margin-bottom: 15px;
    font-weight: normal;
}

.content h3 {
    font-size: 16px;
    color: #2a5a8a;
    margin-bottom: 10px;
    margin-top: 20px;
}

.content p {
    margin-bottom: 12px;
    font-size: 14px;
}

footer {
    background-color: #1a3a5c;
    color: #aac;
    padding: 15px 30px;
    font-size: 12px;
    text-align: center;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    font-size: 14px;
}

table th {
    background-color: #2a5a8a;
    color: #fff;
    padding: 8px 12px;
    text-align: left;
    font-weight: normal;
}

table td {
    padding: 8px 12px;
    border-bottom: 1px solid #ddd;
}

table tr:nth-child(even) {
    background-color: #f8f8f8;
}

table tr:hover {
    background-color: #f0f4f8;
}

form {
    margin-bottom: 20px;
}

form label {
    display: block;
    font-size: 14px;
    margin-bottom: 4px;
    color: #444;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="number"],
form textarea,
form select {
    width: 100%;
    max-width: 400px;
    padding: 7px 10px;
    border: 1px solid #ccc;
    font-size: 14px;
    font-family: Arial, Helvetica, sans-serif;
    margin-bottom: 12px;
}

form textarea {
    max-width: 500px;
    height: 120px;
}

form input[type="submit"],
.btn {
    background-color: #2a5a8a;
    color: #fff;
    border: none;
    padding: 8px 20px;
    font-size: 14px;
    cursor: pointer;
}

form input[type="submit"]:hover,
.btn:hover {
    background-color: #1a3a5c;
}

.btn {
    display: inline-block;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn-small {
    padding: 4px 12px;
    font-size: 12px;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px 15px;
    margin-bottom: 15px;
    border: 1px solid #f5c6cb;
    font-size: 14px;
}

.success {
    background-color: #d4edda;
    color: #155724;
    padding: 10px 15px;
    margin-bottom: 15px;
    border: 1px solid #c3e6cb;
    font-size: 14px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.product-card {
    border: 1px solid #ddd;
    padding: 15px;
    background-color: #fafafa;
}

.product-card h3 {
    margin-top: 0;
    font-size: 16px;
    color: #1a3a5c;
}

.product-card .meta {
    font-size: 13px;
    color: #666;
    margin-bottom: 8px;
}

.product-card .price {
    font-size: 18px;
    color: #1a3a5c;
    font-weight: bold;
    margin-bottom: 10px;
}

.product-card .desc {
    font-size: 13px;
    margin-bottom: 10px;
    color: #555;
}

.entrance {
    text-align: center;
    padding: 80px 30px;
}

.entrance h1 {
    font-size: 32px;
    color: #1a3a5c;
    margin-bottom: 20px;
}

.entrance p {
    font-size: 16px;
    margin-bottom: 15px;
    color: #555;
}

.entrance .disclaimer {
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    padding: 15px;
    margin: 20px auto;
    max-width: 600px;
    font-size: 13px;
    color: #856404;
}

.entrance .btn {
    font-size: 18px;
    padding: 12px 40px;
    margin-top: 20px;
}

.cart-table input[type="number"] {
    width: 60px;
    padding: 4px;
}

.order-total {
    text-align: right;
    font-size: 18px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #ddd;
}

.login-form {
    max-width: 360px;
}

.search-form input[type="text"] {
    max-width: 300px;
}

.content ul li {
    margin-bottom: 5px;
}

@media (max-width: 768px) {
    .container {
        max-width: 100%;
    }

    header {
        padding: 15px;
    }

    header h1 {
        font-size: 20px;
    }

    nav {
        padding: 10px 15px;
    }

    nav a {
        margin-right: 12px;
        font-size: 13px;
    }

    .wrapper {
        flex-direction: column;
        min-height: auto;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #d0d8e0;
        padding: 15px;
    }

    .sidebar ul {
        display: flex;
        flex-wrap: wrap;
        gap: 5px 15px;
        margin-bottom: 0;
    }

    .sidebar h3 {
        margin-bottom: 8px;
    }

    .sidebar ul li {
        margin-bottom: 0;
    }

    .content {
        padding: 20px 15px;
    }

    .product-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .entrance {
        padding: 40px 20px;
    }

    .entrance h1 {
        font-size: 26px;
    }

    .entrance p {
        font-size: 14px;
    }

    .entrance .disclaimer {
        margin: 15px 10px;
        padding: 12px;
    }

    form input[type="text"],
    form input[type="email"],
    form input[type="password"],
    form input[type="number"],
    form textarea,
    form select {
        max-width: 100%;
    }

    form textarea {
        max-width: 100%;
    }

    .login-form {
        max-width: 100%;
    }

    .search-form input[type="text"] {
        max-width: 100%;
    }

    table {
        font-size: 13px;
    }

    table th,
    table td {
        padding: 6px 8px;
    }

    .order-total {
        font-size: 16px;
    }

    .cart-table input[type="number"] {
        width: 50px;
    }

    .content {
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 18px;
    }

    header p {
        font-size: 12px;
    }

    nav a {
        font-size: 12px;
        margin-right: 8px;
    }

    .content h2 {
        font-size: 18px;
    }

    .content h3 {
        font-size: 15px;
    }

    .entrance .btn {
        font-size: 16px;
        padding: 10px 30px;
    }

    .product-card .price {
        font-size: 16px;
    }

    .btn {
        padding: 6px 14px;
        font-size: 13px;
    }

    .btn-small {
        padding: 4px 10px;
        font-size: 11px;
    }

    .sidebar ul {
        flex-direction: column;
        gap: 3px;
    }
}