* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    color: #333;
    line-height: 1.6;
}

header {
    border-bottom: 2px solid #e67e22;
    padding-bottom: 15px;
    margin-bottom: 25px;
}

nav a {
    margin-right: 15px;
    text-decoration: none;
    color: #e67e22;
    font-weight: 500;
}

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

nav span {
    margin-right: 15px;
    color: #666;
}

main {
    min-height: 300px;
}

h1 {
    color: #2c3e50;
}

footer {
    margin-top: 40px;
    padding-top: 15px;
    border-top: 1px solid #eee;
    color: #888;
    font-size: 0.9em;
}

.flash {
    padding: 12px 16px;
    margin-bottom: 15px;
    border-radius: 4px;
}

.flash-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

img {
    height: 100px;
    width: 100px;
}