:root {
            /* 與前台首頁一致（橘棕色系） */
            --primary-orange: #C75214;
            --primary-dark: #A04010;
            --accent-yellow: #F8B62D;
            --bg-cream: #F6F7EF;
            --primary-rgb: 199, 82, 20;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, var(--bg-cream) 0%, #FFFFFF 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .login-container {
            width: 100%;
            max-width: 450px;
        }

        .login-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(var(--primary-rgb), 0.12);
            overflow: hidden;
        }

        .login-header {
            background: linear-gradient(135deg, var(--primary-orange), #E8803A);
            padding: 2.5rem 2rem;
            text-align: center;
            color: white;
        }

        .login-header .logo {
            width: 70px;
            height: 70px;
            background: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .login-header .logo img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            padding: 8px;
        }

        .login-header h1 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
        }

        .login-header p {
            font-size: 0.95rem;
            opacity: 0.95;
            margin-top: 0.5rem;
        }

        .login-body {
            padding: 2.5rem 2rem;
        }

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

        .form-label {
            display: block;
            font-weight: 600;
            color: #333;
            margin-bottom: 0.5rem;
            font-size: 0.95rem;
        }

        .form-label i {
            color: var(--primary-orange);
            margin-right: 0.5rem;
        }

        .form-control {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 2px solid #E0E0E0;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-orange);
            box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.12);
        }

        .input-group {
            position: relative;
        }

        .input-group .form-control {
            padding-right: 3rem;
        }

        .input-group-btn {
            position: absolute;
            right: 0;
            top: 0;
            height: 100%;
            padding: 0 1rem;
            background: none;
            border: none;
            color: #666;
            cursor: pointer;
            transition: color 0.3s;
        }

        .input-group-btn:hover {
            color: var(--primary-orange);
        }

        .form-check {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .form-check-input {
            width: 18px;
            height: 18px;
            border: 2px solid #E0E0E0;
            border-radius: 4px;
            cursor: pointer;
        }

        .form-check-label {
            font-size: 0.95rem;
            color: #666;
            cursor: pointer;
        }

        .btn-login {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(135deg, var(--primary-orange), #E8803A);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.22);
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.32);
        }

        .btn-login:active {
            transform: translateY(0);
        }

        .btn-sso {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(135deg, #4A90E2, #357ABD);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(74, 144, 226, 0.2);
            margin-bottom: 1rem;
        }

        .btn-sso:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(74, 144, 226, 0.3);
        }

        .btn-sso:active {
            transform: translateY(0);
        }

        .forgot-password {
            text-align: center;
            margin-top: 1.5rem;
        }

        .forgot-password a {
            color: var(--primary-orange);
            text-decoration: none;
            font-size: 0.95rem;
            transition: color 0.3s;
        }

        .forgot-password a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        /* 站台 CSP 未開放 style-src 'unsafe-inline'，顯示狀態一律以 class 切換 */
        .is-hidden {
            display: none !important;
        }

        .alert {
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .alert-danger {
            background: #FEE;
            border: 1px solid #FCC;
            color: #C33;
        }

        .alert-danger i {
            font-size: 1.2rem;
        }

        .alert-info {
            background: #EAF4FD;
            border: 1px solid #BEE0F7;
            color: #21618C;
        }

        .alert-info i {
            font-size: 1.2rem;
        }

        .alert-info .btn-close {
            color: #21618C;
        }

        .btn-close {
            margin-left: auto;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: #C33;
            cursor: pointer;
            opacity: 0.6;
            transition: opacity 0.3s;
        }

        .btn-close:hover {
            opacity: 1;
        }

        .login-footer {
            text-align: center;
            padding: 1.5rem 2rem;
            background: #F8F9FA;
            color: #666;
            font-size: 0.9rem;
        }

        .info-box {
            background: rgba(var(--primary-rgb), 0.05);
            border-left: 4px solid var(--primary-orange);
            padding: 1rem 1.25rem;
            border-radius: 8px;
            margin-top: 1.5rem;
        }

        .info-box h6 {
            color: var(--primary-orange);
            font-weight: 600;
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .info-box ul {
            margin: 0;
            padding-left: 1.25rem;
            color: #666;
            font-size: 0.9rem;
        }

        .info-box li {
            margin-bottom: 0.5rem;
        }

        @media (max-width: 576px) {
            .login-header {
                padding: 2rem 1.5rem;
            }

            .login-body {
                padding: 2rem 1.5rem;
            }

            .login-header h1 {
                font-size: 1.3rem;
            }
        }

/* 雙因子驗證碼輸入欄：加大字距便於核對 6 位數字 */
.tfa-code { letter-spacing: 0.6rem; font-size: 1.35rem; text-align: center; font-weight: 600; }

.login-divider-wrap { margin: 1.5rem 0; text-align: center; position: relative; }
.login-divider-inner { position: relative; display: inline-block; width: 100%; }
.login-divider-line { position: absolute; top: 50%; left: 0; right: 0; height: 1px; background: #E0E0E0; }
.login-divider-text { position: relative; background: white; padding: 0 1rem; color: #666; font-size: 0.9rem; }