/* ----------------- 基本重置 ----------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to right, #74ebd5, #ACB6E5);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* ----------------- 登入框 ----------------- */
.login-container {
    background: #fff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    width: 100%;
    max-width: 400px;
}

.login-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    color: #555;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 14px;
}

.input-group input:focus {
    border-color: #4CAF50;
    outline: none;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background-color: #45a049;
}

#errorMessage {
    color: red;
    text-align: center;
    margin-bottom: 15px;
    font-size: 14px;
}

.signup-link {
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
}

.signup-link a {
    color: #4CAF50;
    text-decoration: none;
}

.signup-link a:hover {
    text-decoration: underline;
}

/* ----------------- 響應式 ----------------- */
@media (max-width: 480px) {
    .login-container {
        padding: 30px 20px;
    }
    button {
        padding: 10px;
        font-size: 14px;
    }
}