:root {
            --color-primary: #0022ff;
            --color-primary-dark: #05008a;
            --color-bg: #f5f5f5;
            --color-white: #ffffff;
            --color-text: #333;
            --color-text-dark: #1a1a1a;
            --color-text-light: #666;
            --color-text-lighter: #999;
            --color-text-subtle: #555;
            --color-border: #e0e0e0;
            --color-border-dark: #ddd;
            --color-border-darker: #ccc;
            --color-input-bg: #fafafa;
            --color-output-bg: #f9f9f9;
            --color-btn-bg: #f0f0f0;
            --color-btn-hover: #e5e5e5;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
            background: var(--color-bg);
            padding: 40px 20px;
            color: var(--color-text);
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        h1 {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--color-text-dark);
        }

        .subtitle {
            color: var(--color-text-light);
            margin-bottom: 32px;
            font-size: 15px;
        }

        .content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-bottom: 20px;
        }

        .panel {
            background: var(--color-white);
            border-radius: 8px;
            padding: 24px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }

        .panel-header {
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--color-text-light);
            margin-bottom: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .header-right {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .font-selector {
            font-size: 12px;
            font-weight: 500;
            text-transform: none;
            letter-spacing: 0;
        }

        .font-selector select {
            margin-left: 8px;
            padding: 4px 8px;
            border: 1px solid var(--color-border-dark);
            border-radius: 4px;
            font-size: 12px;
            cursor: pointer;
            background: var(--color-white);
        }

        .font-selector select:focus {
            outline: none;
            border-color: var(--color-primary);
        }

        .copy-btn {
            padding: 6px 12px;
            min-width: 85px;
            font-size: 11px;
            font-weight: 600;
            line-height:1;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            background: var(--color-btn-bg);
            color: var(--color-text-light);
            border: 1px solid var(--color-border-dark);
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s;
            display: inline-block;
            text-align: center;
            white-space: nowrap;
        }

        /* Ensures consistent button size */
        .copy-btn.fixed {
            width: 85px;
        }

        .copy-btn:hover {
            background: var(--color-btn-hover);
            border-color: var(--color-border-darker);
            color: var(--color-text);
        }

        .copy-btn:active {
            transform: translateY(1px);
        }

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

        textarea {
            width: 100%;
            min-height: 400px;
            padding: 16px;
            border: 1px solid var(--color-border);
            border-radius: 6px;
            font-size: 16px;
            line-height: 1.6;
            resize: vertical;
            transition: border-color 0.2s;
        }

        textarea:focus {
            outline: none;
            border-color: var(--color-primary);
        }

        .input-area {
            background: var(--color-input-bg);
        }

        .output-area {
            background: var(--color-output-bg);
            color: var(--color-text-subtle);
        }

        .controls {
            display: flex;
            gap: 12px;
            align-items: center;
            flex-wrap: wrap;
            margin-bottom: 1.5em;
        }

        button {
            background: var(--color-primary);
            color: var(--color-white);
            border: none;
            padding: 12px 24px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }

        button:hover {
            background: var(--color-primary-dark);
        }

        button:active {
            transform: translateY(1px);
        }

        .auto-sort {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-text-light);
        }

        input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
            accent-color: var(--color-primary);
        }

        .stats {
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--color-border);
            font-size: 13px;
            color: var(--color-text-lighter);
        }

        @media (max-width: 900px) {
            .content {
                grid-template-columns: 1fr;
            }
        }