:root {
    --primary-color: #1a73e8;
    --primary-rgb: 26, 115, 232;
    --primary-dark: #1557b0;
    --bg-main: #ffffff;
    --bg-sidebar: #f7f8fa;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --border-color: #f2f2f2;
    --input-bg: #f4f4f7;
    --message-child-bg: #e3f2fd;
    --message-agent-bg: transparent;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
    --border-radius-lg: 20px;
    --border-radius-md: 12px;
}

body {
    background-color: var(--bg-color);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
}