body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.auth-container {
    background: #ffffff;
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

h2 {
    text-align: center;
    color: #1c1e21;
    margin-bottom: 1.5rem;
}

input {
    width: 100%;
    padding: 14px;
    margin: 10px 0;
    border: 1px solid #dddfe2;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
}

input:focus {
    border-color: #1877f2;
    outline: none;
    box-shadow: 0 0 0 2px #e7f3ff;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #1877f2;
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #166fe5;
}

.footer-link {
    text-align: center;
    margin-top: 20px;
    border-top: 1px solid #dddfe2;
    padding-top: 20px;
}

.footer-link a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 600;
}

.alert {
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    text-align: center;
    font-size: 14px;
}

.error { background: #ffebe9; color: #d73a49; border: 1px solid #ffcecb; }
.success { background: #dcffe4; color: #28a745; border: 1px solid #bef5cb; }