:root{--color-primary: #1a5276;--color-primary-light: #2980b9;--color-primary-dark: #0e3a54;--color-accent: #27ae60;--color-bg: #f0f4f8;--color-surface: #ffffff;--color-text: #2c3e50;--color-text-light: #7f8c8d;--color-text-inverse: #ffffff;--color-border: #dce3e8;--color-user-bubble: #1a5276;--color-user-text: #ffffff;--color-bot-bubble: #ffffff;--color-bot-text: #2c3e50;--color-escalation: #e67e22;--color-escalation-bg: #fef5e7;--radius-lg: 20px;--radius-md: 12px;--radius-sm: 8px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .12);--font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif}