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ease}.modal-btn:active{transform:scale(0.97)}.modal-btn-cancel{background:var(--panel);border-color:var(--border);color:var(--text)}.modal-btn-cancel:hover{background:var(--user-bg)}.modal-btn-danger{background:#dc2626;color:#fff}.modal-btn-danger:hover{background:#b91c1c}.modal-btn-primary{background:var(--accent-vivid);color:#fff}.modal-btn-primary:hover{background:var(--accent-dark)}.mobile-menu-btn{display:none;width:32px;height:32px;border-radius:7px;border:1px solid var(--border);background:var(--panel);color:var(--text-dim);cursor:pointer;align-items:center;justify-content:center;flex-shrink:0}.mobile-menu-btn:hover{color:var(--text)}body.embed-mode .mobile-menu-btn{display:none!important}.sidebar-backdrop{position:fixed;inset:0;background:rgba(20,18,16,0.42);z-index:999;display:none}.sidebar-backdrop.visible{display:block}@media (max-width:768px){.mobile-menu-btn{display:flex}.header-brand{display:flex}.sidebar{position:fixed;top:0;left:0;height:100vh;z-index:1000;transform:translateX(-100%);box-shadow:4px 0 24px rgba(0,0,0,0.18)}.sidebar.mobile-open{transform:translateX(0)}.header{padding:12px 16px;gap:8px}.header .name{font-size:14.5px}.messages{padding:4px 0 16px}.msg{padding:16px 16px;gap:12px}.msg .avatar{width:24px;height:24px}.empty-state{padding:20px 20px;gap:12px}.empty-state-icon{width:80px;height:80px}.empty-state-title{font-size:17px;max-width:100%}.composer-area{padding:10px 14px 14px}.composer{gap:8px}.composer textarea{font-size:16px}.composer .attach-btn{display:none}.composer .voice-lang-select{max-width:64px;padding:0 20px 0 8px}.chart-canvas-holder{height:200px}}@media (hover:none) and (pointer:coarse){.sidebar-history-delete{display:flex}}