:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #a5b4fc;
            --secondary: #f97316;
            --secondary-dark: #ea580c;
            --dark: #1e293b;
            --dark-alt: #334155;
            --light: #f8fafc;
            --light-alt: #e2e8f0;
            --success: #22c55e;
            --danger: #ef4444;
            --warning: #f59e0b;
            --border-radius: 12px;
            --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: var(--light);
            color: var(--dark);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        header {
            background-color: white;
            padding: 1rem 2rem;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 100;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: bold;
            font-size: 1.5rem;
            color: var(--primary);
        }

        .logo span {
            color: var(--secondary);
        }

        .language-selector {
            position: relative;
        }

        .language-toggle {
            background: transparent;
            border: 1px solid var(--light-alt);
            border-radius: var(--border-radius);
            padding: 8px 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .language-toggle:hover {
            border-color: var(--primary-light);
        }

        .language-menu {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: 8px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            width: 180px;
            z-index: 10;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: var(--transition);
        }

        .language-menu.active {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .language-item {
            padding: 12px 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }

        .language-item:hover {
            background: var(--light-alt);
        }

        .language-icon {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            background: var(--primary-light);
            color: var(--primary-dark);
        }

        main {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 3rem 1rem;
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
        }

        .hero {
            text-align: center;
            margin-bottom: 2rem;
            max-width: 700px;
        }

        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark);
            line-height: 1.2;
        }

        .hero p {
            color: var(--dark-alt);
            font-size: 1.1rem;
            line-height: 1.6;
        }

        .generator-container {
            width: 100%;
            max-width: 600px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .tabs {
            display: flex;
            border-bottom: 1px solid var(--light-alt);
        }

        .tab {
            flex: 1;
            padding: 1rem;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            color: var(--dark-alt);
            font-weight: 500;
        }

        .tab.active {
            background-color: var(--primary);
            color: white;
        }

        .tab:hover:not(.active) {
            background-color: var(--light-alt);
        }

        .content {
            padding: 2rem;
        }

        .password-display {
            position: relative;
            margin-bottom: 2rem;
        }

        .password-field {
            width: 100%;
            padding: 1rem;
            font-size: 1.2rem;
            border: 2px solid var(--light-alt);
            border-radius: var(--border-radius);
            background: var(--light);
            margin-bottom: 0.5rem;
            font-family: 'Courier New', monospace;
            transition: var(--transition);
        }

        .password-field:focus {
            outline: none;
            border-color: var(--primary);
        }

        .password-actions {
            display: flex;
            gap: 10px;
            position: absolute;
            right: 12px;
            top: 12px;
        }

        .password-action {
            background: var(--light);
            border: none;
            border-radius: 5px;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--dark-alt);
            transition: var(--transition);
        }

        .password-action:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }

        .strength-meter {
            height: 8px;
            border-radius: 4px;
            background: var(--light-alt);
            margin-bottom: 0.5rem;
            overflow: hidden;
        }

        .strength-fill {
            height: 100%;
            width: 0;
            border-radius: 4px;
            transition: var(--transition);
        }

        .strength-text {
            font-size: 0.9rem;
            color: var(--dark-alt);
            display: flex;
            align-items: center;
            gap: 5px;
        }

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

        .options-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .length-slider {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .slider {
            flex: 1;
            -webkit-appearance: none;
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: var(--light-alt);
            outline: none;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary);
            cursor: pointer;
            transition: var(--transition);
        }

        .slider::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        .length-value {
            font-weight: 600;
            min-width: 40px;
            text-align: center;
            color: var(--primary);
        }

        .checkbox-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            padding: 8px 12px;
            border-radius: var(--border-radius);
            transition: var(--transition);
            flex: 1 0 calc(50% - 0.5rem);
            min-width: 170px;
        }

        .checkbox-group:hover {
            background: var(--light-alt);
        }

        .checkbox-input {
            display: none;
        }

        .checkbox-custom {
            width: 20px;
            height: 20px;
            border-radius: 5px;
            border: 2px solid var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .checkbox-input:checked + .checkbox-custom {
            background: var(--primary);
            border-color: var(--primary);
        }

        .checkbox-input:checked + .checkbox-custom i {
            opacity: 1;
            transform: scale(1);
        }

        .checkbox-custom i {
            color: white;
            font-size: 12px;
            opacity: 0;
            transform: scale(0);
            transition: var(--transition);
        }

        .checkbox-label {
            font-size: 0.95rem;
        }

        .custom-section {
            margin-top: 1rem;
        }

        .custom-input {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid var(--light-alt);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }

        .custom-input:focus {
            outline: none;
            border-color: var(--primary);
        }

        .action-buttons {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
        }

        .btn {
            flex: 1;
            padding: 12px 24px;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: var(--light-alt);
            color: var(--dark);
        }

        .btn-secondary:hover {
            background: var(--light);
            transform: translateY(-2px);
        }

        .recently-generated {
            margin-top: 3rem;
            width: 100%;
            max-width: 600px;
        }

        .history-title {
            margin-bottom: 1rem;
            font-weight: 600;
            color: var(--dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .history-title button {
            background: none;
            border: none;
            color: var(--primary);
            cursor: pointer;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .history-title button:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .history-list {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .history-item {
            padding: 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--light-alt);
        }

        .history-item:last-child {
            border-bottom: none;
        }

        .history-password {
            font-family: 'Courier New', monospace;
            flex: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            padding-right: 1rem;
        }

        .history-actions {
            display: flex;
            gap: 10px;
        }

        .history-action {
            background: var(--light);
            border: none;
            border-radius: 5px;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--dark-alt);
            transition: var(--transition);
        }

        .history-action:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }

        .notification {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: white;
            padding: 16px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 12px;
            transform: translateX(120%);
            transition: transform 0.3s ease;
            z-index: 1000;
        }

        .notification.show {
            transform: translateX(0);
        }

        .notification-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--success);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .notification-content {
            flex: 1;
        }

        .notification-title {
            font-weight: 600;
            margin-bottom: 4px;
        }

        .notification-message {
            color: var(--dark-alt);
            font-size: 0.9rem;
        }

        .notification-close {
            color: var(--dark-alt);
            cursor: pointer;
        }

        footer {
            background: white;
            padding: 2rem;
            text-align: center;
            margin-top: 3rem;
            box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
        }

        .footer-content {
            max-width: 600px;
            margin: 0 auto;
        }

        .theme-switch {
            position: fixed;
            bottom: 20px;
            left: 20px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: white;
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 100;
            transition: var(--transition);
        }

        .theme-switch:hover {
            transform: scale(1.1);
        }

        /* Dark mode */
        body.dark-mode {
            background-color: var(--dark);
            color: var(--light);
        }

        body.dark-mode header,
        body.dark-mode .generator-container,
        body.dark-mode .history-list,
        body.dark-mode footer,
        body.dark-mode .notification,
        body.dark-mode .language-menu {
            background-color: var(--dark-alt);
        }

        body.dark-mode .password-field,
        body.dark-mode .custom-input,
        body.dark-mode .password-action,
        body.dark-mode .history-action {
            background: var(--dark);
            color: var(--light);
            border-color: var(--dark-alt);
        }

        body.dark-mode .tab:not(.active) {
            color: var(--light);
        }

        body.dark-mode .tab:hover:not(.active) {
            background-color: var(--dark);
        }

        body.dark-mode .hero h1,
        body.dark-mode .options-title,
        body.dark-mode .history-title,
        body.dark-mode .notification-title {
            color: var(--light);
        }

        body.dark-mode .hero p,
        body.dark-mode .strength-text,
        body.dark-mode .checkbox-label,
        body.dark-mode .notification-message {
            color: var(--light-alt);
        }

        body.dark-mode .history-item {
            border-color: var(--dark);
        }

        body.dark-mode .btn-secondary {
            background: var(--dark);
            color: var(--light);
        }

        body.dark-mode .btn-secondary:hover {
            background: var(--dark-alt);
        }

        body.dark-mode .theme-switch {
            background: var(--dark-alt);
            color: var(--light);
        }

        body.dark-mode .checkbox-group:hover {
            background: var(--dark);
        }

        body.dark-mode .strength-meter,
        body.dark-mode .slider {
            background: var(--dark);
        }

        /* Mobile responsive */
        @media (max-width: 650px) {
            .hero h1 {
                font-size: 2rem;
            }

            .content {
                padding: 1.5rem;
            }

            .checkbox-wrapper {
                flex-direction: column;
                gap: 0.5rem;
            }

            .checkbox-group {
                flex: 1 0 100%;
            }

            .action-buttons {
                flex-direction: column;
            }

            .history-password {
                max-width: 150px;
            }
        }

        @media (max-width: 480px) {
            .tabs {
                flex-direction: column;
            }
            
            .tab {
                border-bottom: 1px solid var(--light-alt);
            }
            
            .action-buttons {
                gap: 0.5rem;
            }
            
            .password-actions {
                position: static;
                margin-top: 1rem;
                justify-content: flex-end;
            }
            
            .password-field {
                padding-right: 1rem;
            }
        }