body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h1 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
}

nav {
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

nav a {
    margin: 0 15px;
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
}

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

form {
    display: flex;
    flex-direction: column;
}

label {
    text-align: left;
    margin-bottom: 5px;
    font-weight: 600;
}

input[type="text"],
input[type="email"],
input[type="number"],
textarea {
    padding: 10px;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
}

button {
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s;
}

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

button.secondary {
    background-color: #95a5a6;
    margin-top: 0.5rem;
}

button.secondary:hover {
    background-color: #7f8c8d;
}

.home-link {
    display: block;
    margin-bottom: 1rem;
    text-align: right;
    color: #3498db;
    text-decoration: none;
}

.home-link:hover {
    text-decoration: underline;
}

#message, .error {
    margin-top: 1rem;
    font-weight: 500;
}

#message.success {
    color: #27ae60;
}

#message.error, .error {
    color: #c0392b;
}

.guide-content {
    text-align: left;
    border-top: 1px solid #eee;
    padding-top: 1rem;
    margin-top: 1rem;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin-top: 1rem;
}

.stat-item {
    font-size: 1.1rem;
}