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(max-width:768px){.app-container{position:relative}.sidebar{z-index:1100;box-shadow:var(--shadow-lg);transition:transform .22s;position:fixed;inset:0 auto 0 0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay{z-index:1090;background:#0000006b;display:block;position:fixed;inset:0}.top-bar{padding:calc(10px + env(safe-area-inset-top))12px 10px;gap:10px}.top-bar-right{gap:8px}.title{text-overflow:ellipsis;white-space:nowrap;max-width:180px;overflow:hidden}.title-subtitle{display:none}.chat-area{padding:16px 12px 8px}.chat-composer-shell{padding:0 10px calc(10px + env(safe-area-inset-bottom))}.composer-bar{gap:8px}.composer-input-shell{border-radius:20px;padding:8px 10px}.icon-btn{width:34px;height:34px}.send-btn{width:44px;height:44px}.message{gap:10px}.message-avatar{width:30px;height:30px}.message-content{max-width:calc(100% - 40px);padding:12px 14px}.welcome-screen{padding:20px}.welcome-actions{flex-direction:column;width:100%}.start-btn,.import-trigger-welcome{width:100%}.library-view{padding:16px 12px calc(24px + env(safe-area-inset-bottom))}.library-title-row{flex-direction:column;align-items:stretch}.library-actions{justify-content:space-between}.library-import-btn{flex:1}.library-grid{grid-template-columns:1fr}.modal-card{width:100%;max-height:calc(100dvh - 24px)}.model-card-grid,.model-platform-switcher{grid-template-columns:minmax(0,1fr)}.model-platform-summary{flex-direction:column;align-items:flex-start}.modal-header,.modal-body,.modal-footer{padding-left:16px;padding-right:16px}}@media (max-width:480px){.top-bar-right{gap:6px}.title{max-width:140px}}.library-progress-wrapper{flex-direction:column;align-items:flex-start;width:100%;max-width:400px;margin-top:12px;display:flex}.library-progress-bar-bg{background:#80808033;border-radius:5px;width:100%;height:10px;margin-top:8px;overflow:hidden;box-shadow:inset 0 1px 3px #0000001a}.library-progress-bar-fill{background:linear-gradient(90deg,#4caf50,#8bc34a);border-radius:5px;height:100%;box-shadow:0 0 8px #4caf5066}