body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #ECEFF1;
    color: #263238;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}
.container {
    width: 100%;
    max-width: 800px;
    padding: 20px;
}
input {
    border-radius: 12px;
    padding: 10px;
    border: 1px solid #B0BEC5;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 12px;
}
input:focus {
    border-color: #6200EA;
    outline: none;
    box-shadow: 0 0 0 2px rgba(98, 0, 234, 0.2);
}
button {
    background-color: #6200EA;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 12px 18px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}
button:hover {
    background-color: #3700B3;
}
button:disabled {
    background-color: #CFD8DC;
    cursor: not-allowed;
}
.card {
    background: white;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    margin-bottom: 24px;
}
.error {
    color: #D32F2F;
    font-size: 14px;
}