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(width>=861px){.app{border-left:none;border-right:none;max-width:none;margin:0}.chat-topbar,.sidebar-close-btn{display:none}.chat-main,.composer-bar{max-width:var(--chat-content-max-width);width:100%;margin-left:auto;margin-right:auto}.messages{padding-top:24px;padding-left:0;padding-right:0}.chat.chat-active .messages{padding-top:56px}.composer-bar{padding-left:0;padding-right:0}.composer{max-width:none}.session-rating{margin-left:0;margin-right:0}}@media (width<=860px){.app{grid-template-columns:1fr}.sidebar{z-index:60;border-right:1px solid var(--line);width:300px;max-width:84vw;transition:transform .25s;position:fixed;top:0;bottom:0;left:0;transform:translate(-100%);box-shadow:0 0 40px #0000002e}.sidebar.open{transform:translate(0)}.sidebar-backdrop{z-index:50;opacity:0;pointer-events:none;background:#141c1a73;transition:opacity .25s;display:block;position:fixed;inset:0}.sidebar-backdrop.show{opacity:1;pointer-events:auto}.msg-row,.chips-row{max-width:90%}}@media (width<=640px){.chat-topbar{padding:8px 16px 10px}.book-btn{justify-content:center;align-self:flex-start}.chat-actionbar{padding:0 16px 12px}.session-rating{margin:0 16px 10px;padding:16px}.messages{gap:14px;padding:56px 24px 24px}.messages.messages--empty-v2{padding-left:0;padding-right:0}.empty-state{gap:12px;width:100%;padding-inline:0}.empty-state-lottie,.empty-state-logo{width:96px;height:96px}.empty-state-logo-icon{width:38px;height:38px}.empty-state h2{font-size:28px}.empty-state-v2-welcome{font-size:18px}.empty-action-chip,.starter-chip{font-size:13px}.msg-row,.chips-row{max-width:94%}.composer-bar{padding:12px 16px 10px}.composer-note{font-size:11px}}