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13px}.loading{display:inline-block;width:15px;height:15px;border:2px solid #ffffff70;border-top-color:white;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:1000px){.dashboard-grid{grid-template-columns:1fr}.side-column{grid-template-columns:1fr 1fr}.library-grid{grid-template-columns:repeat(2,1fr)}.pricing-grid{grid-template-columns:1fr}.price-card{min-height:0}.study-grid{grid-template-columns:1fr}.study-aside{display:none}}@media(max-width:700px){.auth-shell{grid-template-columns:1fr}.auth-story{min-height:0;padding:25px 27px}.auth-copy{padding:40px 0 20px}.auth-copy h1{font-size:35px}.preview-stack,.auth-foot{display:none}.auth-side{padding:35px 27px}.app-shell{display:block}.sidebar{height:auto;position:sticky;z-index:10;top:0;padding:12px 18px;flex-direction:row;align-items:center;justify-content:space-between;border-right:0;border-bottom:1px solid #e8ede7}.sidebar .logo{margin:0}.sidebar .nav-label,.sidebar-bottom,.sidebar .nav button span{display:none}.sidebar .nav{display:flex;gap:4px}.sidebar .nav button{width:38px;height:38px;justify-content:center;padding:9px}.sidebar .nav svg{width:19px;height:19px}.main{padding:0 19px 90px}.topbar{height:59px}.top-actions .status{display:none}.page{padding-top:26px}.page-head{align-items:flex-start}.page-head h1{font-size:27px}.date-badge{display:none}.composer{padding:18px}.side-column{grid-template-columns:1fr}.nam-intro{min-height:170px}.library-grid{grid-template-columns:1fr}.source-tabs button{font-size:11px;padding:9px 3px}.source-tabs svg{display:none}.mode-row{align-items:flex-start;flex-direction:column}.composer-foot{align-items:stretch;flex-direction:column}.composer-foot .btn{width:100%}.invite-box{flex-direction:column;align-items:stretch}.invite-box .field{width:100%}.deck-header{display:block}.deck-header .btn{margin-top:10px}.question-card{padding:20px}.question-actions{flex-direction:column;align-items:stretch}.question-actions .btn{width:100%}.flashcard{min-height:250px}.nam-float{bottom:16px;right:16px}.chat-panel{right:10px;bottom:75px}}
/* Consistent, quiet interaction feedback across mouse and touch controls. */
.nav button,.icon-button,.source-tabs button,.mode-choice button,.deck-tabs button,.option,.faq-list summary,.sample-tabs button,.sample-bottom button{transition:color .18s ease,background-color .18s ease,border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.nav button:hover,.icon-button:hover,.sample-bottom button:hover{transform:translateY(-1px)}
.option:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 5px 14px rgba(39,65,43,.06)}
@media(prefers-reduced-motion:reduce){.nav button,.icon-button,.source-tabs button,.mode-choice button,.deck-tabs button,.option,.faq-list summary,.sample-tabs button,.sample-bottom button{transition:none}}