/*------------------------------------------------------------------
  重置部分預設樣式
-------------------------------------------------------------------*/
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/*------------------------------------------------------------------
  設定 body 與 html 的基本樣式與背景
-------------------------------------------------------------------*/
body, html {
    height: 100%;
    font-family: 'Arial', sans-serif;
    background: url('../image/bg_19.gif') no-repeat center center fixed;
    background-size: cover;
}

/*------------------------------------------------------------------
  主容器：使用 Flex 布局，並將登入框往上移離頂部80px
-------------------------------------------------------------------*/
.main-container {
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 從頂部開始排列 */
    min-height: 100vh;
    padding: 20px;
    padding-top: 20px; /* 離畫面頂端80px */
}

/*------------------------------------------------------------------
  登入容器：白色背景、圓角、陰影與彩色邊框，提升整體質感
-------------------------------------------------------------------*/
.login-container {
    background-color: lightcyan;
    max-width: 400px;
    width: 100%;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    text-align: center;
    border: 2px solid #007bff; /* 加入藍色邊框 */
}

/*------------------------------------------------------------------
  標題樣式：適當的字型大小及間距
-------------------------------------------------------------------*/
.header {
    font-size: 50px;
    margin-bottom: 20px;
    color: #007bff;
}

/*------------------------------------------------------------------
  表單控制項：統一寬度、內距、邊框與字體大小，並加入彩色邊框
-------------------------------------------------------------------*/
.form-control {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 15px;
    border: 1px solid #007bff; /* 加入藍色邊框 */
    border-radius: 4px;
    font-size: 1.5em;
    font-weight: bold;
}

/*------------------------------------------------------------------
  輸入欄位圖示：置於欄位右側
-------------------------------------------------------------------*/
.input-icon {
    position: relative;
}

    .input-icon i {
        position: absolute;
        right: 15px;
        top: 50%;
        transform: translateY(-50%);
        color: #aaa;
    }

/*------------------------------------------------------------------
  自動登入區塊：置中顯示
-------------------------------------------------------------------*/
.auto-login-container {
    text-align: center;
}

/*------------------------------------------------------------------
  自動登入勾選框與文字：深綠色、30px、粗體
-------------------------------------------------------------------*/
.auto-login {
    font-size: 25px;
    color: #006400; /* 深綠色 */
    font-weight: bold;
}

/*------------------------------------------------------------------
  登入按鈕區塊：上方間距20px
-------------------------------------------------------------------*/
.login-button-container {
    margin-top: 20px;
}

/*------------------------------------------------------------------
  登入按鈕：大按鈕、強調色、滑鼠懸停變化
-------------------------------------------------------------------*/
.btn {
    background-color: deepskyblue;
    border: none;
    color: white;
    padding: 20px 0;
    font-size: 2em;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    width: 98%;
    transition: background-color 0.3s ease;
}

    .btn:hover {
        background-color: #0056b3;
    }

/*------------------------------------------------------------------
  錯誤訊息樣式：紅色文字，適當的字型大小與間距
-------------------------------------------------------------------*/
.error-msg {
    color: red;
    font-size: 1em;
    margin-top: 10px;
    display: block;
}

/*------------------------------------------------------------------
  響應式調整 - 平板及一般手機尺寸
-------------------------------------------------------------------*/
@media (max-width: 600px) {
    .login-container {
        padding: 25px;
    }

    .header {
        font-size: 2.2em;
    }

    .form-control {
        font-size: 1.2em;
        font-weight: bold;
        padding: 10px 12px;
    }

    .btn {
        font-size: 2em;
        color: green;
        padding: 10px 0;
    }
}

/*------------------------------------------------------------------
  響應式調整 - 小型手機尺寸
-------------------------------------------------------------------*/
@media (max-width: 376px) {
    .login-container {
        padding: 20px;
    }

    .header {
        font-size: 2em;
    }

    .form-control {
        font-size: 1.2em;
        font-weight: bold;
        padding: 8px 10px;
    }

    .btn {
        font-size: 2em;
        color: red;
        padding: 8px 0;
    }
}