/* =========================================
   1. 基礎變數與重設
   ========================================= */
:root {
    --bg-color: #0b1120;            /* 整頁底色：深沉深藍 */
    --card-bg-color: #172236;       /* 卡片底色：略亮一層的深藍灰色 */
    --input-bg-color: #1e293b;      /* 輸入框底色 */
    --border-color: #2e3c54;        /* 邊框線條 */
    --border-focus: #3b82f6;        /* 聚焦高亮色 */
    
    --text-primary: #f8fafc;        /* 主文字白 */
    --text-secondary: #94a3b8;      /* 次文字灰 */
    --text-muted: #64748b;          /* 警語暗灰 */

    --primary-blue: #2563eb;        /* 主按鈕藍 */
    --primary-blue-hover: #1d4ed8;  /* 主按鈕滑鼠懸停 (Hover) 深藍色 */
    --blue-shadow: rgba(37, 99, 235, 0.35); /* 按鈕與圖示發光藍色陰影 */

    --radius-card: 16px;            /* 登入外層卡片圓角半徑 */
    --radius-input: 10px;           /* 輸入框與選擇卡片圓角半徑 */
    --radius-btn: 10px;             /* 登入按鈕圓角半徑 */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body.login-page {
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang TC", "Microsoft JhengHei", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

/* =========================================
   2. 登入卡片本體
   ========================================= */
.login-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 440px;
    padding: 44px 36px;
    border-radius: var(--radius-card);
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
    text-align: center;
}

/* =========================================
   3. 品牌與圖示
   ========================================= */
.brand {
    margin-bottom: 32px;
}

.brand-icon {
    width: 68px;
    height: 68px;
    margin: 0 auto 18px;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: 0 8px 20px var(--blue-shadow);
}

.brand h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-primary);
}

/* =========================================
   4. 輸入表單
   ========================================= */
.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.input-group input {
    width: 100%;
    padding: 13px 16px;
    font-size: 15px;
    color: var(--text-primary);
    background-color: var(--input-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.input-group input:hover {
    border-color: #3b4d6d;
}

.input-group input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* [2026-10-15] 異動說明：覆蓋瀏覽器歷史紀錄與自動填入 (Autofill) 的預設白底樣式 */
.input-group input:-webkit-autofill,
.input-group input:-webkit-autofill:hover,
.input-group input:-webkit-autofill:focus,
.input-group input:-webkit-autofill:active {
    -webkit-text-fill-color: var(--text-primary) !important;
    -webkit-box-shadow: 0 0 0 1000px var(--input-bg-color) inset !important;
    box-shadow: 0 0 0 1000px var(--input-bg-color) inset !important;
    transition: background-color 5000s ease-in-out 0s;
}

/* =========================================
   5. 登入按鈕
   ========================================= */
.btn-login {
    width: 100%;
    padding: 14px;
    margin-top: 10px;
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
    background: linear-gradient(180deg, #3b82f6 0%, var(--primary-blue) 100%);
    border: none;
    border-radius: var(--radius-btn);
    cursor: pointer;
    box-shadow: 0 4px 14px var(--blue-shadow);
    transition: all 0.2s ease;
}

.btn-login:hover {
    background: var(--primary-blue-hover);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.45);
    transform: translateY(-1px);
}

.btn-login:active {
    transform: translateY(1px);
    box-shadow: 0 2px 8px var(--blue-shadow);
}

/* =========================================
   6. ISO 27000 資安聲明
   ========================================= */
.security-notice {
    margin-top: 36px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-muted);
}

.security-notice .copyright {
    margin-top: 4px;
    font-size: 11px;
    opacity: 0.8;
}

/* =========================================
   7. 響應式微調 (RWD: 對應手機版 S1)
   ========================================= */
@media (max-width: 480px) {
    .login-card {
        padding: 32px 24px;
        border: none;
        box-shadow: none;
        background-color: transparent;         /* 手機端可採純色融入背景 */
    }

    .brand h1 {
        font-size: 22px;
    }
}

/* =========================================
   市場環境選擇卡片樣式
   ========================================= */
.market-toggle-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 4px;
}

.market-option {
    cursor: pointer;
}

.market-option input[type="radio"] {
    display: none;
}

.market-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 12px;
    background-color: var(--input-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    transition: all 0.2s ease;
}

.market-card strong {
    font-size: 14px;
    color: var(--text-primary);
}

.market-card small {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* 選取態高亮 */
.market-option input[type="radio"]:checked+.market-card {
    border-color: var(--primary-blue);
    background-color: rgba(37, 99, 235, 0.15);
    box-shadow: 0 0 0 1px var(--primary-blue);
}

.market-option input[type="radio"]:checked+.market-card strong {
    color: #60a5fa;
}