/* ========= NB lively gradient card (Bootstrap3 相容) ========= */
:root {
    --bg1: #e8edf3;
    --bg2: #dfe7f0;
    --card-top: #e9eef5; /* 卡片漸層上緣 */
    --card-mid: #cdd7e7;
    --card-bot: #9fb2d0; /* 卡片漸層下緣（帶點藍） */

    --ring: rgba(255,255,255,.85); /* 外框白邊 */
    --shadow: rgba(62, 90, 140, .28);
    --inner-top: rgba(255,255,255,.45);
    --inner-bot: rgba(72, 96, 140, .18);
    --text: #1f2328;
    --muted: #6b7280;
    --input-bg: #f7f9fc;
    --input-bd: #cfd7e3;
    --icon: #6e86a8;
    --btn1: #5b8bff;
    --btn2: #386ff5;
    --btn-hover-lift: translateY(-1px);
}

html, body {
    height: 100%;
}

* {
    font-size: 12px;
}

.glyphicon {
    top: 0;
}

/* 背景：更亮、更乾淨，帶極淡動態 */
body.logon {
    min-height: 100%;
    overflow: hidden;
    background: radial-gradient(1200px 600px at 20% 15%, #f4f7fb 0%, transparent 60%), radial-gradient(1200px 600px at 80% 90%, #eef3fa 0%, transparent 60%), linear-gradient(180deg, var(--bg1), var(--bg2));
    background-size: 100% 100%;
}

/* 版心位置 */
#box {
    padding: 6vh 0;
}

/* 卡片：大圓角 + 環形白邊 + 內外光暈 + 漸層 + 極淡動畫 */
#dl {
    position: relative;
    border-radius: 28px;
    padding: 32px 32px 26px;
    background: linear-gradient(180deg, var(--card-top) 0%, var(--card-mid) 48%, var(--card-bot) 100%);
    border: 8px solid var(--ring);
    box-shadow: 0 28px 60px var(--shadow), /* 外陰影 */
    inset 0 10px 24px var(--inner-top), /* 內上光 */
    inset 0 -18px 34px var(--inner-bot); /* 內下光 */
    animation: cardShift 22s ease-in-out infinite alternate;
}

@keyframes cardShift {
    0% {
        background-position: 50% 0%;
    }

    100% {
        background-position: 50% 100%;
    }
}

/* 角落柔光（裝飾，不喜歡可刪） */
#dl::before, #dl::after {
    content: "";
    position: absolute;
    pointer-events: none;
    border-radius: 28px;
    inset: 0;
}

#dl::before {
    background: radial-gradient(320px 220px at 20% 8%, rgba(255,255,255,.55) 0%, transparent 60%);
    mix-blend-mode: screen;
}

#dl::after {
    background: radial-gradient(420px 280px at 80% 92%, rgba(92,132,210,.18) 0%, transparent 65%);
    mix-blend-mode: multiply;
}

/* 標題：去掉舊陰影，置中 */
.title > h3 {
    margin: 6px 0 6px;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: .4px;
    color: var(--text);
    text-shadow: none;
    text-align: center;
}

/* Logo 灰藍化、置中 */
.nb-logo {
    max-height: 56px;
    margin: 4px auto 8px;
    filter: grayscale(100%) contrast(110%) opacity(.9) hue-rotate(200deg);
}

/* 輸入群組：圓角、亮面、聚焦時有光暈 */
.input-group {
    margin-bottom: 14px;
}

.input-group-addon {
    background: var(--input-bg);
    border: 1px solid var(--input-bd);
    color: var(--icon);
    border-right: 0;
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
}

.input-group .form-control {
    background: var(--input-bg);
    border: 1px solid var(--input-bd);
    color: var(--text);
    border-left: 0;
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.6);
}

    .input-group .form-control:focus {
        border-color: #98a8c4;
        outline: 0;
        box-shadow: 0 0 0 3px rgba(124,148,196,.25);
    }

/* 忘記密碼 */
.forget {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

    .forget a {
        color: var(--muted);
        text-decoration: none;
        font-size: 14px;
    }

        .forget a:hover {
            color: #2b3a56;
            text-decoration: underline;
        }

/* 錯誤訊息 */
#result {
    font-size: 14px;
    color: #c62828;
}

/* 主要按鈕：活潑的藍色漸層 + 懸停提升 */
.btn-info {
    background-image: linear-gradient(90deg, var(--btn1), var(--btn2));
    border: none;
    color: #fff;
    box-shadow: 0 10px 20px rgba(80,120,220,.35), inset 0 1px 0 rgba(255,255,255,.25);
    transition: transform .15s ease, box-shadow .15s ease;
    border-radius: 10px;
}

    .btn-info:hover,
    .btn-info:focus {
        transform: var(--btn-hover-lift);
        box-shadow: 0 14px 28px rgba(80,120,220,.45), inset 0 1px 0 rgba(255,255,255,.25);
    }

/* selectpicker（若有） */
.selectpicker.btn {
    background: var(--input-bg);
    border: 1px solid var(--input-bd);
    color: var(--text);
}

.bootstrap-select .dropdown-menu {
    border: 1px solid var(--input-bd);
}

/* 移除你舊版的藍色輸入規則，避免干擾 */
#dl > input {
    all: unset;
    display: none;
}

/* RWD 微調 */
@media (max-width: 992px) {
    #dl {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    #dl {
        margin: 0 auto;
        padding: 26px 22px 20px;
        border-width: 6px;
        border-radius: 22px;
    }

    .title > h3 {
        font-size: 24px;
    }
}