:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --panel-bg: #fff;
    --accent-color: #007bff;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
    --bg-image: none;
}

.dark-mode {
    --bg-color: #1e1e1e;
    --text-color: #ddd;
    --panel-bg: #2c2c2c;
    --accent-color: #4da6ff;
}

.custom-mode {
    --bg-color: #f0f8ff;
    --text-color: #000;
    --panel-bg: #ffffff;
    --accent-color: #ff4500;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--bg-color) var(--bg-image) no-repeat center/cover;
    color: var(--text-color);
    transition: background 0.3s, color 0.3s;
}

.container {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 20px;
    max-width: 1200px;
    margin: auto;
}

.resizable {
    position: relative;
    background: var(--panel-bg);
    border: 1px solid #ccc;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 10px;
    min-width: 200px;
    min-height: 200px;
    overflow: auto;
    transition: box-shadow 0.3s;
}

    .resizable:hover {
        box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    }

.resize-handle {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: var(--accent-color);
    cursor: ew-resize;
    opacity: 0.5;
}

    .resize-handle:hover {
        opacity: 1;
    }

#input-area textarea {
    width: 100%;
    height: 100px;
    border-radius: 4px;
    border: 1px solid #ddd;
    padding: 10px;
}

button {
    padding: 10px 15px;
    margin: 5px;
    cursor: pointer;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    transition: background 0.3s;
}

    button:hover {
        background: darken(var(--accent-color), 10%);
    }

#summary-output, #analysis-output {
    white-space: pre-wrap;
    word-wrap: break-word;
}