:root{--primary: #1a73e8;--primary-dark: #1557b0;--primary-light: #e8f0fe;--bg-main: #f0f2f5;--bg-chat: #ffffff;--bg-input: #ffffff;--text-primary: #202124;--text-secondary: #5f6368;--text-light: #9aa0a6;--bot-bubble: #ffffff;--bot-bubble-border: #e0e4ea;--bot-accent: #4a90d9;--user-bubble: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%);--user-bubble-flat: #1a73e8;--user-bubble-text: #ffffff;--border-color: #dadce0;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 2px 8px rgba(0, 0, 0, .12);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .16);--shadow-bubble: 0 1px 4px rgba(0, 0, 0, .06);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-bubble: 18px;--header-height: 60px;--input-height: 72px;--transition-fast: .15s ease;--transition-normal: .25s ease;--sidebar-width: 260px;--sidebar-bg: #1e293b;--sidebar-text: #cbd5e1;--sidebar-text-active: #ffffff;--sidebar-hover: #334155;--sidebar-active: var(--primary);--danger: #dc2626;--danger-hover: #b91c1c;--danger-light: #fef2f2;--success: #16a34a}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.5;color:var(--text-primary);background:var(--bg-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--primary);text-decoration:none}button,input,textarea{font-family:inherit;font-size:inherit}.material-icons{font-size:22px;vertical-align:middle;-webkit-user-select:none;user-select:none}