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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url("/static/images/background.jpg") center/cover no-repeat;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0, 0, 0, 0.25);
            z-index: 0;
        }

        .login-card {
            position: relative;
            z-index: 1;
            width: 380px;
            padding: 45px 40px 35px;
            background: rgba(255, 255, 255, 0.01);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
            text-align: center;
        }

        .login-card .logo {
            font-size: 26px;
            font-weight: bold;
            color: #fff;
            letter-spacing: 3px;
            margin-bottom: 6px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }

        .login-card .subtitle {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.7);
            letter-spacing: 2px;
            margin-bottom: 8px;
        }

        .login-card .slogan {
            font-size: 13px;
            color: #ff6b6b;
            margin-bottom: 30px;
            text-shadow: 0 1px 2px rgba(0,0,0,0.2);
        }

        .form-group {
            margin-bottom: 18px;
            text-align: left;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 8px;
        }

        .form-group input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.02);
            color: #fff;
            font-size: 14px;
            outline: none;
            transition: all 0.3s;
        }

        .form-group input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }

        .form-group input:focus {
            border-color: rgba(255, 255, 255, 0.5);
            background: rgba(255, 255, 255, 0.15);
            box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
        }

        .login-btn {
            width: 100%;
            padding: 13px;
            margin-top: 10px;
            border: none;
            border-radius: 10px;
            background: linear-gradient(135deg, #ff4444, #cc0000);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            letter-spacing: 2px;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 68, 68, 0.4);
        }

        .login-links {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
            padding: 0 5px;
        }

        .login-links a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s;
        }

        .login-links a:hover {
            color: #fff;
        }

        .alert {
            display: none;
            padding: 10px 14px;
            border-radius: 8px;
            margin-bottom: 15px;
            font-size: 13px;
            text-align: left;
        }

        .alert-error {
            background: rgba(255, 77, 79, 0.2);
            color: #ffccc7;
            border: 1px solid rgba(255, 77, 79, 0.3);
        }

        .alert-success {
            background: rgba(82, 196, 26, 0.2);
            color: #d9f7be;
            border: 1px solid rgba(82, 196, 26, 0.3);
        }

        /* ===== Tab Switching Controls ===== */
        .tab-container {
            display: flex;
            margin-bottom: 24px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            overflow: hidden;
        }

        .tab-btn {
            flex: 1;
            padding: 12px 0;
            border: none;
            background: transparent;
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.35s ease;
            position: relative;
            letter-spacing: 1px;
        }

        .tab-btn.active {
            background: linear-gradient(135deg, #ff4444, #cc0000);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(204, 0, 0, 0.35);
        }

        .tab-btn:not(.active):hover {
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.9);
        }

        /* ===== Admin Hint Text ===== */
        .admin-hint {
            font-size: 12px;
            color: rgba(255, 107, 107, 0.9);
            margin-bottom: 16px;
            padding: 8px 12px;
            background: rgba(255, 68, 68, 0.08);
            border-radius: 8px;
            border: 1px solid rgba(255, 68, 68, 0.15);
            text-align: left;
            line-height: 1.5;
        }

        /* ===== Form Toggle Animation ===== */
        .form-panel {
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        .form-panel.hidden {
            display: none;
        }

        /* ===== Forgot Password Modal ===== */
        .modal-overlay {
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            display: none;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(4px);
        }
        .modal-overlay.active {
            display: flex;
        }
        .modal-box {
            width: 400px;
            background: rgba(30, 30, 40, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
            padding: 32px;
            position: relative;
            animation: modalSlideIn 0.3s ease-out;
        }
        @keyframes modalSlideIn {
            from { opacity: 0; transform: translateY(-20px) scale(0.95); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        .modal-box h3 {
            color: #fff;
            font-size: 18px;
            margin-bottom: 20px;
            text-align: center;
        }
        .modal-box .form-group {
            margin-bottom: 16px;
        }
        .modal-box .form-group label {
            color: rgba(255, 255, 255, 0.75);
            font-size: 13px;
        }
        .modal-box .form-group input {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(255, 255, 255, 0.2);
        }
        .modal-box .form-group input:focus {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.4);
        }
        .modal-box .btn-row {
            display: flex;
            gap: 10px;
            margin-top: 20px;
        }
        .modal-box .btn-row button {
            flex: 1;
            padding: 12px;
            border: none;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        .modal-box .btn-cancel {
            background: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
        }
        .modal-box .btn-cancel:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        .modal-box .btn-submit {
            background: linear-gradient(135deg, #ff4444, #cc0000);
            color: #fff;
        }
        .modal-box .btn-submit:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(255, 68, 68, 0.35);
        }
        .modal-close {
            position: absolute;
            top: 12px;
            right: 12px;
            width: 30px;
            height: 30px;
            border: none;
            background: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.6);
            border-radius: 8px;
            font-size: 18px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
        }
        .modal-close:hover {
            background: rgba(255, 255, 255, 0.2);
            color: #fff;
        }
        .modal-hint {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 12px;
            text-align: center;
            line-height: 1.5;
        }

        /* ===== Responsive Adaptation ===== */
        @media (max-width: 480px) {
            .login-card {
                width: 92vw;
                padding: 35px 24px 28px;
                border-radius: 16px;
            }
            .modal-box {
                width: 92vw;
                padding: 24px;
            }
            .login-card .logo {
                font-size: 22px;
            }
            .tab-btn {
                font-size: 13px;
                padding: 10px 0;
            }
            .form-group input {
                padding: 10px 14px;
                font-size: 16px; /* Prevent iOS auto-zoom */
            }
            .login-btn {
                padding: 12px;
                font-size: 15px;
            }
            .login-links {
                padding: 0 2px;
            }
            .login-links a {
                font-size: 12px;
            }
        }


/* ================================================================
   [二百五十] 登录页精致度提升：低饱和暖色基调
   仅颜色/阴影/圆角/过渡调整（同优先级后置覆盖上文规则），
   布局尺寸与 480px 响应式媒体查询不动。
   ================================================================ */

/* 背景遮罩：暖褐调（原冷灰黑） */
body::before {
    background: rgba(74, 58, 40, 0.32);
}

/* 居中卡片：暖白实体+层次阴影（原近透明暗玻璃） */
.login-card {
    background: rgba(255, 252, 246, 0.95);
    border: 1px solid rgba(214, 196, 168, 0.55);
    border-radius: 18px;
    box-shadow: 0 24px 60px rgba(60, 45, 25, 0.30), 0 4px 16px rgba(60, 45, 25, 0.12);
}

.login-card .logo {
    color: #7c5a34;
    text-shadow: none;
}
.login-card .subtitle { color: #a8946f; }
.login-card .slogan {
    color: #b07a4a;
    text-shadow: none;
}

/* 表单 */
.form-group label { color: #6b5d4a; }
.form-group input {
    background: #fbf7ee;
    border: 1px solid #e0d3ba;
    color: #4a4036;
    transition: all 0.18s ease;
}
.form-group input::placeholder { color: #b6a78b; }
.form-group input:focus {
    border-color: #b07a4a;
    background: #fffdf8;
    box-shadow: 0 0 0 3px rgba(176, 122, 74, 0.15);
}

/* 登录按钮：暖焦糖渐变（替换高饱和红渐变） */
.login-btn {
    background: linear-gradient(135deg, #b57c4b, #9a6537);
    transition: all 0.18s ease;
    box-shadow: 0 4px 14px rgba(154, 101, 55, 0.25);
}
.login-btn:hover {
    background: linear-gradient(135deg, #a06a3e, #8f5f33);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(154, 101, 55, 0.38);
}
.login-btn:active { transform: translateY(0); }

/* Tab 切换 */
.tab-container {
    background: #f3ecdd;
    border: 1px solid #e2d6bd;
}
.tab-btn { color: #8a7a60; transition: all 0.18s ease; }
.tab-btn.active {
    background: linear-gradient(135deg, #b57c4b, #9a6537);
    color: #fff;
    box-shadow: 0 4px 12px rgba(154, 101, 55, 0.28);
}
.tab-btn:not(.active):hover {
    background: rgba(176, 122, 74, 0.08);
    color: #6b5d4a;
}

/* 管理员提示 / 链接 / 消息条：低饱和语义色 */
.admin-hint {
    color: #a05140;
    background: #f7ebe5;
    border: 1px solid #ecd0c4;
}
.login-links a { color: #8a7a60; transition: color 0.18s ease; }
.login-links a:hover { color: #54483a; }
.alert-error {
    background: #f7e8e3;
    color: #a05140;
    border: 1px solid #e6c6b8;
}
.alert-success {
    background: #edf3e6;
    color: #5f7d52;
    border: 1px solid #d3e0c4;
}

/* 忘记密码弹窗：暖白卡片（原深灰玻璃），遮罩轻微模糊带兜底 */
.modal-overlay {
    background: rgba(74, 60, 44, 0.45);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.modal-box {
    background: rgba(255, 252, 246, 0.98);
    border: 1px solid rgba(214, 196, 168, 0.6);
    box-shadow: 0 24px 60px rgba(60, 45, 25, 0.30);
}
.modal-box h3 { color: #4a4036; }
.modal-box .form-group label { color: #6b5d4a; }
.modal-box .form-group input {
    background: #fbf7ee;
    border: 1px solid #e0d3ba;
    color: #4a4036;
}
.modal-box .form-group input:focus {
    background: #fffdf8;
    border-color: #b07a4a;
    box-shadow: 0 0 0 3px rgba(176, 122, 74, 0.15);
}
.modal-box .btn-row button { transition: all 0.18s ease; }
.modal-box .btn-cancel {
    background: #f1ebe0;
    color: #6b5d4a;
    border: 1px solid #ddd0ba;
}
.modal-box .btn-cancel:hover { background: #e7ddcb; }
.modal-box .btn-submit {
    background: linear-gradient(135deg, #b57c4b, #9a6537);
}
.modal-box .btn-submit:hover {
    background: linear-gradient(135deg, #a06a3e, #8f5f33);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(154, 101, 55, 0.32);
}
.modal-close {
    background: #f0e9da;
    color: #8a7a60;
}
.modal-close:hover {
    background: #e5dcc6;
    color: #54483a;
}
.modal-hint { color: #a5947a; }