/* ============= MODERN DESIGN SYSTEM ============= */
        :root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --accent-color: #667eea;
            --text-dark: #2d3748;
            --text-light: #718096;
            --border-radius: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
        }

        /* ============= ANIMATIONS ============= */
        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeIn {
            to {
                opacity: 1;
            }
        }

        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(-5px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ============= FORM CONTAINER ============= */
        .login-popup {
            background: white;
            border-radius: var(--border-radius);
            padding: 0;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
            animation: slideUp 0.5s ease-out;
            overflow: hidden;
            max-width: 500px;
            margin: 30px auto;
            border: 1px solid rgba(102, 126, 234, 0.1);
        }

        .popup-header {
            background: var(--primary-gradient);
            padding: 40px 20px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .popup-header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
            background-size: 50px 50px;
        }

        .popup-logo {
            position: relative;
            z-index: 1;
        }

        .logo-img {
            max-width: 120px;
            height: auto;
        }

        .popup-content {
            padding: 40px;
        }

        .popup-title {
            font-size: 28px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 10px;
            color: var(--text-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        /* .popup-title::before {
            content: '';
            display: inline-block;
            width: 40px;
            height: 40px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        } */

        /* ============= FORM GROUP ============= */
        .form-group {
            margin-bottom: 24px;
            animation: fadeIn 0.5s ease-out forwards;
            opacity: 0;
        }

        .form-group:nth-child(2) { animation-delay: 0.1s; }
        .form-group:nth-child(3) { animation-delay: 0.2s; }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-dark);
            font-size: 14px;
            letter-spacing: 0.5px;
        }

        .form-label span {
            color: #ef4444;
            margin-left: 3px;
        }

        .form-control {
            width: 100%;
            padding: 12px 14px;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 15px;
            font-family: inherit;
            transition: var(--transition);
            background: #f8fafc;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--accent-color);
            background: white;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .form-control::placeholder {
            color: #cbd5e0;
        }

        .form-group small {
            display: block;
            margin-top: 6px;
            color: var(--text-light);
            font-size: 12px;
            line-height: 1.4;
        }

        .form-group span[style*="color: red"] {
            display: block;
            margin-top: 6px;
            color: #ef4444 !important;
            font-size: 12px;
            animation: slideInUp 0.3s ease-out;
        }

        /* ============= BUTTONS ============= */
        .button-group {
            display: flex;
            gap: 12px;
            margin-top: 30px;
            margin-bottom: 20px;
        }

        .btn {
            flex: 1;
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }

        .btn-confirm {
            background: var(--primary-gradient);
            color: white;
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
        }

        .btn-confirm:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
        }

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

        .btn-confirm:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .btn-cancel {
            background: #f1f5f9;
            color: var(--text-dark);
            border: 2px solid #e2e8f0;
        }

        .btn-cancel:hover {
            background: #e2e8f0;
            border-color: var(--accent-color);
            color: var(--accent-color);
        }

        /* ============= PROMPTS & LINKS ============= */
        .signup-prompt {
            text-align: center;
            font-size: 14px;
            color: var(--text-light);
            margin-top: 16px;
        }

        .signup-link {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            position: relative;
        }

        .signup-link:hover {
            color: #764ba2;
        }

        .signup-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            transition: width 0.3s ease;
        }

        .signup-link:hover::after {
            width: 100%;
        }

        /* ============= ALERTS & MESSAGES ============= */
        .alert {
            padding: 16px;
            margin-bottom: 20px;
            border-radius: 8px;
            color: #fff;
            font-size: 13px;
            font-weight: 500;
            animation: slideInUp 0.3s ease-out;
            /* display: flex; */
            align-items: center;
            gap: 12px;
        }

        .alert_info {
            background-color: #4285f4;
            border: 2px solid #4285f4
        }

        .alert_success {
            background-color: #09c97f;
            border: 2px solid #09c97f
        }

        .alert_warning {
            background-color: #f8b15d;
            border: 2px solid #f8b15d
        }

        .alert_error {
            background-color: #f95668;
            border: 2px solid #f95668
        }

        .fade_info {
            background-color: #d9e6fb;
            border: 1px solid #4285f4
        }

        .fade_info .close {
            color: #4285f4
        }

        .fade_info strong {
            color: #4285f4
        }

        .fade_success {
            background-color: #c9ffe5;
            border: 1px solid #09c97f
        }

        .fade_success .close {
            color: #09c97f
        }

        .fade_success strong {
            color: #09c97f
        }

        .fade_warning {
            background-color: #fff0cc;
            border: 1px solid #f8b15d
        }

        .fade_warning .close {
            color: #f8b15d
        }

        .fade_warning strong {
            color: #f8b15d
        }

        .fade_error {
            background-color: #ffdbdb;
            border: 1px solid #f95668
        }

        .fade_error .close {
            color: #f95668
        }

        .fade_error strong {
            color: #f95668
        }

        button.close {
            -webkit-appearance: none;
            padding: 0;
            cursor: pointer;
            background: 0 0;
            border: 0;
            font-size: 18px;
        }

        .close {
            color: #fff;
            opacity: 0.9;
            font-weight: normal;
            margin-left: auto;
        }

        /* ============= RESPONSIVE DESIGN ============= */
        @media (max-width: 768px) {
            .login-popup {
                margin: 20px;
            }

            .popup-header {
                padding: 30px 15px;
            }

            .popup-content {
                padding: 30px 20px;
            }

            .popup-title {
                font-size: 24px;
            }

            .button-group {
                flex-direction: column;
            }

            .btn {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            .login-popup {
                margin: 15px;
            }

            .popup-content {
                padding: 24px 18px;
            }

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

            .popup-title {
                font-size: 20px;
            }

            .button-group {
                margin-top: 24px;
            }
        }