:root{--safe-area-top: env(safe-area-inset-top);--safe-area-bottom: env(safe-area-inset-bottom);--safe-area-bottom-constant: constant(safe-area-inset-bottom);--tg-top-offset: 0px;--tg-left-offset: 0px;--tg-right-offset: 0px;--tg-sidebar-left-offset: 0px;--tg-sidebar-right-offset: 0px;--motion-fast: .16s;--motion-medium: .24s;--motion-ease-out: cubic-bezier(.2, .8, .2, 1);--motion-spring: cubic-bezier(.2, .9, .25, 1.12);--press-scale: .975;--focus-ring: rgba(255, 255, 255, .44);--plus-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--z-sidebar-overlay: 45;--z-sidebar: 50;--z-app-chrome: 100;--z-floating-menu: 130;--z-toast: 160;--z-modal: 180;--z-modal-priority: 190;--z-dev-overlay: 9999}@media(max-width:767px){html,body{overscroll-behavior-y:none;overscroll-behavior:none}body{-webkit-overflow-scrolling:touch}}:root{--bg-primary: #ffffff;--bg-secondary: #f7f7f8;--bg-tertiary: #ececf1;--bg-chat-input: #f7f7f8;--bg-user-message: #f7f7f8;--bg-bot-message: transparent;--bg-sidebar: #ededed;--bg-sidebar-item: #ededed;--bg-sidebar-item-hover: #e2e2e2;--chrome-glass-strong: rgba(255, 255, 255, .88);--chrome-glass-soft: rgba(255, 255, 255, .54);--chrome-glass-clear: rgba(255, 255, 255, 0);--sidebar-glass-strong: var(--chrome-glass-strong);--sidebar-glass-soft: var(--chrome-glass-soft);--sidebar-glass-clear: var(--chrome-glass-clear);--interactive-active-bg: rgba(0, 0, 0, .04);--interactive-active-border: rgba(0, 0, 0, .16);--interactive-active-shadow: 0 8px 18px rgba(15, 23, 42, .08);--primary-action-bg: var(--accent-blue);--primary-action-text: #ffffff;--primary-action-shadow: 0 14px 28px rgba(59, 130, 246, .22);--usage-progress-low: rgba(0, 0, 0, .68);--usage-progress-medium: #f59e0b;--usage-progress-high: var(--accent-red);--model-pro-bg: rgba(0, 0, 0, .035);--model-pro-border: rgba(0, 0, 0, .1);--model-pro-selected-border: rgba(0, 0, 0, .32);--model-pro-selected-shadow: 0 18px 34px rgba(15, 23, 42, .1);--model-pro-price-bg: 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0px}html{background-color:var(--bg-primary)}body{font-family:Inter,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);margin:0;padding:0}.pwa-install-banner{display:none}.pwa-install-guide{position:fixed;inset:0;display:flex;align-items:center;justify-content:center}.pwa-install-guide.hidden{display:none!important}.pwa-install-guide-backdrop{position:absolute;inset:0;background:#0000004d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.pwa-install-guide-card{position:relative;width:min(calc(100% - 32px),360px);max-height:calc(100dvh - 32px);overflow-y:auto;padding:28px 24px 24px;border:1px solid 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1}.sidebar-profile-avatar-placeholder{font-size:1.5rem}.sidebar-profile-avatar[hidden],.sidebar-profile-avatar-placeholder[hidden]{display:none}.sidebar-profile-avatar:not([src]),.sidebar-profile-avatar[src=""]{background:var(--interactive-active-bg);border-color:var(--interactive-active-border)}.sidebar-profile-copy{min-width:0}.sidebar-profile-name{overflow:hidden;color:var(--text-primary);font-size:.875rem;font-weight:600;line-height:1.25;text-overflow:ellipsis;white-space:nowrap}.sidebar-profile-plan{display:flex;align-items:center;min-width:0;margin-top:.125rem;overflow:hidden;color:var(--text-secondary);font-size:.75rem;font-weight:500;line-height:1.25;text-overflow:ellipsis;white-space:nowrap}.plan-badge-wrap{display:inline-flex;margin-left:.25rem;vertical-align:middle}.plan-badge{display:inline-flex;align-items:center;justify-content:center;min-height:1.125rem;padding:.125rem .375rem;border:1px solid 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var(--sidebar-history-row-height);--sidebar-nav-row-gap: 2px;--sidebar-nav-row-bleed: var(--sidebar-history-row-bleed);--sidebar-nav-row-padding-inline: var(--sidebar-history-row-padding-inline);--sidebar-nav-icon-size: 1.25rem;--sidebar-nav-icon-font-size: .9375rem;--sidebar-nav-label-gap: .5rem;--sidebar-nav-font-size: var(--sidebar-history-font-size);--sidebar-section-font-size: 1rem;--sidebar-history-font-size: 1rem;--sidebar-history-block-start: 8px;--sidebar-history-title-block-end: 10px;--sidebar-history-row-height: 50px;--sidebar-history-row-padding-block: 0px;--sidebar-history-row-bleed: 12px;--sidebar-history-row-padding-inline: 12px;--sidebar-profile-row-bleed: 12px;--sidebar-profile-row-padding-inline: 12px;transform:translate(-100%);position:absolute;z-index:calc(var(--z-app-chrome) + 10);width:100%}.sidebar-open{transform:translate(0)}.sidebar-icon-button{width:40px;height:40px}.sidebar-icon-button 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