.container {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
            width: 100%;
            max-width: 800px;
        }

        h1 { font-size: 1.5rem; margin-bottom: 1.5rem; text-align: center; color: var(--primary-color); }

        textarea {
            width: 100%;
            height: 250px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            resize: vertical;
            box-sizing: border-box;
            margin-bottom: 1rem;
            outline: none;
        }

        textarea:focus { border-color: var(--primary-color); box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1); }

        .controls {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 12px;
        }

        button {
            background-color: white;
            border: 1px solid var(--border-color);
            padding: 12px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.2s ease;
            text-transform: capitalize;
        }

        button:hover {
            background-color: #f1f5f9;
            border-color: var(--primary-color);
        }

        .btn-copy {
            background-color: var(--success-color);
            color: white;
            border: none;
        }

        .btn-copy:hover {
            background-color: #047857;
        }

        .btn-file {
            background-color: var(--primary-color);
            color: white;
            border: none;
        }

        .btn-file:hover {
            background-color: #1d4ed8;
        }

        .btn-clear {
            color: #ef4444;
        }