* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header {
    background: #ffffff;
    border-bottom: 1px solid #e1e4e8;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-weight: bold;
    font-size: 1.2rem;
    color: #004085;
}
nav a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: #495057;
    font-weight: 500;
}
nav a:hover, nav a.active {
    color: #0056b3;
}
main {
    flex: 1;
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    width: 100%;
}
.card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 1.5rem;
}
h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #212529;
}
h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #343a40;
}
p {
    margin-bottom: 1rem;
}
.btn {
    display: inline-block;
    background: #0056b3;
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    margin-right: 0.5rem;
    margin-top: 1rem;
    font-weight: 500;
}
.btn:hover {
    background: #004085;
}
form label {
    display: block;
    margin-top: 1rem;
    font-weight: 500;
}
form input, form textarea {
    width: 100%;
    padding: 0.75rem;
    margin-top: 0.5rem;
    border: 1px solid #ced4da;
    border-radius: 4px;
}
form button {
    background: #28a745;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 1.5rem;
    font-weight: 500;
}
form button:hover {
    background: #218838;
}
footer {
    background: #ffffff;
    border-top: 1px solid #e1e4e8;
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
    color: #6c757d;
}
footer a {
    color: #6c757d;
    text-decoration: none;
    margin: 0 0.5rem;
}
footer a:hover {
    text-decoration: underline;
}
.alert {
    padding: 1rem;
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
    margin-bottom: 1rem;
}