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

        :root {
            --bg-primary: #ffffff;
            --bg-secondary: #FAFAFA;
            --bg-tertiary: #F3F4F9;
            --text-primary: #282D35;
            --text-secondary: #707070;
            --accent: #377322;
            --accent-hover: #2a5a1a;
            --accent-light: #8EF14B;
            --border: #e4e4e4;
            --shadow: rgba(0, 0, 0, 0.1);
        }

        [data-theme="dark"] {
            --bg-primary: #1a1a1a;
            --bg-secondary: #282D35;
            --bg-tertiary: #333840;
            --text-primary: #fafafa;
            --text-secondary: #707070;
            --accent: #377322;
            --accent-hover: #2a5a1a;
            --accent-light: #8EF14B;
            --border: #495057;
            --shadow: rgba(0, 0, 0, 0.3);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: var(--bg-secondary);
            color: var(--text-primary);
            line-height: 1.6;
            transition: background 0.3s, color 0.3s;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        nav {
            background: var(--bg-primary);
            border-bottom: 2px solid var(--border);
            padding: 1rem 0;
            box-shadow: 0 2px 8px var(--shadow);
        }

        .nav-content {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            transition: transform 0.3s;
        }

        .logo-link:hover {
            transform: scale(1.05);
        }

        .logo {
            width: 120px;
            height: auto;
        }

        .nav-title {
            font-size: 1.5rem;
            font-weight: 600;
            background: linear-gradient(135deg, #377322, #317404);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin: 0;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
            flex: 1;
        }

        .main-layout {
            display: grid;
            grid-template-columns: 380px 1fr;
            gap: 2rem;
            align-items: start;
        }

        .controls {
            background: var(--bg-primary);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 2px 8px var(--shadow);
            position: sticky;
            top: 2rem;
        }

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

        .control-group:last-child {
            margin-bottom: 0;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .button-group {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        button {
            padding: 0.6rem 1.2rem;
            border: 2px solid var(--border);
            background: var(--bg-primary);
            color: var(--text-primary);
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.2s;
            font-weight: 500;
        }

        button:hover {
            border-color: var(--accent);
            transform: translateY(-1px);
        }

        button.active {
            background: var(--accent);
            color: white;
            border-color: var(--accent);
        }

        .primary-btn {
            background: var(--accent);
            color: white;
            border-color: var(--accent);
            font-size: 1rem;
            padding: 0.8rem 1.5rem;
        }

        .primary-btn:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
        }

        input[type="range"] {
            width: 100%;
            height: 6px;
            border-radius: 3px;
            background: var(--bg-tertiary);
            outline: none;
            -webkit-appearance: none;
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--accent);
            cursor: pointer;
        }

        input[type="range"]::-moz-range-thumb {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--accent);
            cursor: pointer;
            border: none;
        }

        .range-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 0.5rem;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .output-section {
            background: var(--bg-primary);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 2px 8px var(--shadow);
            min-height: 600px;
        }

        .output-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .stats {
            display: flex;
            gap: 1.5rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .stat {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }

        .toolbar {
            display: flex;
            gap: 0.25rem;
            padding: 0.75rem;
            background: var(--bg-tertiary);
            border-radius: 8px 8px 0 0;
            border: 2px solid var(--border);
            border-bottom: 1px solid var(--border);
            flex-wrap: wrap;
        }

        .toolbar button {
            padding: 0.5rem 0.75rem;
            min-width: 36px;
            font-size: 0.9rem;
            border-radius: 4px;
        }

        .toolbar button:hover {
            background: var(--bg-primary);
        }

        .toolbar button.active {
            background: var(--accent);
            color: white;
        }

        .toolbar .divider {
            width: 1px;
            background: var(--border);
            margin: 0 0.25rem;
        }

        .output {
            background: var(--bg-secondary);
            padding: 1.5rem;
            border-radius: 0 0 8px 8px;
            min-height: 300px;
            max-height: 400px;
            overflow-y: auto;
            border: 2px solid var(--border);
            border-top: none;
            margin-bottom: 1rem;
            outline: none;
        }

        .output:focus {
            border-color: var(--accent);
        }

        .output p {
            margin-bottom: 1rem;
        }

        .output p:last-child {
            margin-bottom: 0;
        }

        .output h1 {
            font-size: 2rem;
            margin-bottom: 1rem;
            background: none;
            -webkit-text-fill-color: inherit;
        }

        .output h2 {
            font-size: 1.5rem;
            margin-bottom: 0.75rem;
        }

        .output h3 {
            font-size: 1.25rem;
            margin-bottom: 0.5rem;
        }

        .output ul, .output ol {
            margin-left: 2rem;
            margin-bottom: 1rem;
        }

        .output li {
            margin-bottom: 0.5rem;
        }

        .output blockquote {
            border-left: 4px solid var(--accent);
            padding-left: 1rem;
            margin: 1rem 0;
            font-style: italic;
            color: var(--text-secondary);
        }

        .preview-modes {
            display: flex;
            gap: 0.5rem;
            margin-top: 1rem;
        }

        .preview-card {
            background: var(--bg-secondary);
            padding: 1rem;
            border-radius: 8px;
            border: 2px solid var(--border);
        }

        .preview-mobile {
            max-width: 375px;
            font-size: 0.9rem;
        }

        .preview-email {
            font-family: Arial, sans-serif;
            line-height: 1.8;
        }

        .theme-toggle {
            position: fixed;
            top: 1.5rem;
            right: 2rem;
            background: var(--bg-primary);
            border: 2px solid var(--border);
            border-radius: 50%;
            width: 50px;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 2px 8px var(--shadow);
            z-index: 100;
        }

        footer {
            background: var(--bg-primary);
            border-top: 2px solid var(--border);
            padding: 1.5rem 0;
            text-align: center;
            color: var(--text-secondary);
            margin-top: 3rem;
        }

        footer a {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.2s;
        }

        footer a:hover {
            color: var(--accent-light);
        }

        .action-buttons {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        .toast {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: var(--accent);
            color: white;
            padding: 1rem 1.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 12px var(--shadow);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.3s;
            z-index: 1000;
        }

        .toast.show {
            opacity: 1;
            transform: translateY(0);
        }

        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }

            h1 {
                font-size: 2rem;
            }

            .main-layout {
                grid-template-columns: 1fr;
                gap: 1rem;
            }

            .controls {
                position: static;
                padding: 1.5rem;
            }

            .output-section {
                padding: 1.5rem;
            }

            .output-header {
                flex-direction: column;
                align-items: flex-start;
            }

            .theme-toggle {
                top: 1rem;
                right: 1rem;
            }
        }