body{
    height:100%;
    display:flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-family: "Chiron GoRound TC", sans-serif;
    font-optical-sizing: auto;
    min-height: 100vh; 
    background-color: #f3f4f6;
}

main{
    display:flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}
.bg-image {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('/static/loginGemini.png'); 
    background-size: cover;      
    background-position: center;  
    z-index: -1;              
    filter: brightness(0.8);      
}

.login-box {
    width: 350px;
    padding: 40px;
    border-radius: 15px;
    background: rgba(255, 255, 255); /* 半透明白色 */
    border: 1px solid rgba(255, 255, 255, 0.4); /* 淺色邊框 */
    
    /* 3. 視覺效果 */
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); /* 外陰影讓框浮起來 */
    backdrop-filter: blur(10px); /* 背景模糊 (毛玻璃關鍵) */
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 讓輸入框也美化一下 */
.account input, .password input {
    width: 330px;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.9);
}

/* 登入按鈕美化 */
.login-btn {
    background-color: #005FB8; 
    color: white;
    border: none;
    padding: 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: 0.3s;
}

.login-btn:hover {
    background-color: #004A91;
}

hr {
    width: 100%;
    border: 0;
    border-top: 1px solid #e5e7eb; 
    margin: 10px 0;
}