:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --error-color: #e74c3c;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    font-family: 'Microsoft JhengHei', sans-serif;
}

.login-container {
    flex: 1;
    width: 100%;
    max-width: 400px;
    padding: 20px;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
    width: 100%;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.error-message {
    background: var(--error-color);
    color: white;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 1rem;
    text-align: center;
}

.form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.form-group label {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}

.form-group input {
    width: 100%;
    padding: 12px 40px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
    box-sizing: border-box;
}

.form-group input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

button {
    width: 100%;
    padding: 12px;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #2980b9;
}

.back-to-site {
    text-align: center;
    margin-top: 1rem;
}

.back-to-site a {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
}

.back-to-site a:hover {
    color: var(--secondary-color);
}

@media (max-width: 480px) {
    .login-container {
        padding: 10px;
    }
    
    .login-box {
        padding: 1.5rem;
    }
    
    .form-group input {
        font-size: 0.9rem;
    }
}

/* 版權資訊區塊 */
.login-footer {
    width: 100%;
    text-align: center;
    padding: 1rem 0;
    color: rgba(255,255,255,0.8);
    margin-top: auto;
}

.login-footer p {
    margin: 0.3rem 0;
    font-size: 0.9rem;
}

.login-footer a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.login-footer a:hover {
    opacity: 0.8;
}