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#f8f9fa;--bg-secondary: #ffffff;--bg-tertiary: #e9ecef;--bg-overlay: #ffffff;--bg-surface: #ffffff;--bg-surface-hover: #f1f3f5;--bg-floating: #ffffff;--text-primary: rgba(0, 0, 0, .87);--text-secondary: rgba(0, 0, 0, .7);--text-tertiary: rgba(0, 0, 0, .5);--border-primary: rgba(0, 0, 0, .15);--border-secondary: rgba(0, 0, 0, .08);--shadow-color: rgba(0, 0, 0, .12)}:root{--header-height: 64px;--header-height-mobile: 56px;--bottom-bar-height: 64px;--touch-target-min: 48px;--safe-area-bottom: env(safe-area-inset-bottom, 0px);--safe-area-top: env(safe-area-inset-top, 0px)}:root{--chat-fs: 14px;--chat-fs-sm: calc(var(--chat-fs) - 2px);--chat-fs-xs: calc(var(--chat-fs) - 3px);--chat-fs-title: calc(var(--chat-fs) + 1px);--chat-fs-header: calc(var(--chat-fs) + 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