body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    color: #333;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 20px;
}

.password-box {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

input[type="password"] {
    padding: 10px;
    width: 200px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-top: 10px;
}

.error {
    color: #e74c3c;
    display: none;
    font-size: 0.9em;
    margin-top: 10px;
}

.grid-evaluaciones {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border-top: 4px solid #3498db;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

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

.back-link {
    display: block;
    margin-top: 30px;
    text-align: center;
    color: #7f8c8d;
    text-decoration: none;
}