:root{--page:#f7f7f6;--line:#e5e5e3;--ink:#27272a;--muted:#6b6b70;--shadow:0 10px 30px #25252510}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skeleton-screen{display:grid;gap:1rem;max-width:900px;margin:.4rem auto}.skeleton-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.skeleton-card,.skeleton-block{min-height:8rem;border:1px solid var(--line);border-radius:14px;background:linear-gradient(100deg,var(--surface) 28%,var(--page) 42%,var(--surface) 58%);background-size:260% 100%;animation:skeleton-shimmer 1.25s ease-in-out infinite}.skeleton-card{min-height:13rem;padding:1.25rem;display:grid;align-content:center;gap:.8rem}.skeleton-line{height:.82rem;width:100%;border-radius:999px;background:linear-gradient(100deg,var(--line) 28%,var(--surface) 42%,var(--line) 58%);background-size:260% 100%;animation:skeleton-shimmer 1.25s ease-in-out infinite}.skeleton-title{width:min(23rem,58%);height:2rem}.skeleton-line.short{width:58%}@keyframes skeleton-shimmer{to{background-position:-130% 0}}
.continue-card{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin:1rem 0;background:linear-gradient(135deg,color-mix(in srgb,var(--blue) 13%,var(--surface)),var(--surface))}.continue-card h2{margin:.18rem 0;font-size:1.18rem}.continue-card p{margin:0}.continue-card button{flex:none}.study-streak{display:flex;align-items:center;gap:.75rem;padding:.78rem 1rem;margin:1rem 0;border:1px solid color-mix(in srgb,var(--blue) 32%,var(--line));border-radius:12px;background:color-mix(in srgb,var(--blue) 8%,var(--surface))}.streak-icon{display:grid;place-items:center;width:2.35rem;height:2.35rem;border-radius:50%;background:#fff3d6;font-size:1.2rem}.dark .streak-icon{background:#51371a}.study-streak b,.study-streak small{display:block}.study-streak small{margin-top:.1rem;color:var(--muted)}
.completion-banner{display:flex;align-items:center;gap:.8rem;margin:0 0 1rem;padding:1rem 1.1rem;border:1px solid #79d6a7;border-radius:13px;background:#e8f8ef;color:#075e32;box-shadow:0 10px 24px #0f9d5821;animation:completion-pop .55s cubic-bezier(.2,.85,.3,1) both}.dark .completion-banner{background:#124a35;color:#d9fbe8;border-color:#2e9e6a}.completion-banner>span{font-size:1.45rem}.completion-banner b,.completion-banner small{display:block}.completion-banner small{margin-top:.14rem;opacity:.85}.flashcard-stage{position:relative}.flashcard-streak-pop{position:absolute;z-index:2;top:.9rem;left:0;right:0;width:max-content;max-width:calc(100% - 2rem);margin:auto;padding:.55rem .9rem;border:1px solid #f7c96f;border-radius:999px;background:#fff3d6;color:#754600;font-weight:900;box-shadow:0 8px 22px #0004;animation:completion-pop .48s cubic-bezier(.2,.85,.3,1) both}.motion-ready .ring{animation:readiness-rise .65s cubic-bezier(.2,.8,.25,1) both}.motion-ready .metric,.metric{animation:metric-rise .45s ease-out both}@keyframes completion-pop{from{opacity:0;transform:translateY(.75rem) scale(.94)}to{opacity:1;transform:none}}@keyframes readiness-rise{from{opacity:0;transform:scale(.8) rotate(-18deg)}to{opacity:1;transform:scale(1) rotate(0)}}@keyframes metric-rise{from{opacity:0;transform:translateY(.3rem)}to{opacity:1;transform:none}}
.topic-card,.choice{transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease,background-color .16s ease}.choice.selected{animation:choice-select .25s ease-out both}.choice.correct{animation:choice-correct .4s ease-out both}.choice.incorrect{animation:choice-incorrect .38s ease-out both}@keyframes choice-select{from{transform:scale(.985)}to{transform:scale(1)}}@keyframes choice-correct{0%{transform:scale(.98)}65%{transform:scale(1.012)}100%{transform:scale(1)}}@keyframes choice-incorrect{0%,100%{transform:translateX(0)}30%{transform:translateX(-4px)}65%{transform:translateX(4px)}}@media(hover:hover){.topic-card:hover{transform:translateY(-3px);box-shadow:0 12px 24px #102a4320;border-color:color-mix(in srgb,var(--blue) 55%,var(--line))}.choice:not(:disabled):hover{transform:translateY(-1px);box-shadow:0 5px 14px #102a4316}}
.flashcard-rating-stage{grid-template-rows:auto minmax(0,1fr)}.flashcard-rating-card{width:min(720px,100%);justify-self:center;align-self:center;display:grid;gap:1.35rem;padding:clamp(1.25rem,4vw,2.25rem);border:1px solid #93c5fd66;border-radius:22px;background:#f8fafc;color:#111827;box-shadow:0 24px 70px #0007;text-align:center}.flashcard-rating-card h1{margin:.35rem 0 .7rem;font-size:clamp(1.65rem,4vw,2.5rem)}.flashcard-rating-card p{margin:0;color:#475569}.flashcard-rating-card .rating-grid{gap:.75rem}.flashcard-rating-card .rating-grid button{min-height:5.5rem;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.flashcard-rating-card .auth-error{min-height:0;margin:0;text-align:center}
.flashcard-rating-notice{top:4.8rem;z-index:4;transition:opacity .26s ease,transform .26s ease}.flashcard-rating-notice.is-leaving{opacity:0;transform:translateY(-.4rem);pointer-events:none}
.flashcard-rotate-note{display:none!important}
.flashcard-stage:not(.flashcard-rating-stage){grid-template-rows:auto minmax(0,1fr) auto}
.admin-topic-mastery{margin-top:1rem}.mastery-status{display:inline-flex;align-items:center;min-height:1.75rem;padding:.15rem .55rem;border:1px solid var(--line);border-radius:999px;font-size:.78rem;font-weight:800;white-space:nowrap}.mastery-status.strong{border-color:#86d9ae;background:#e8f8ef;color:#075e32}.mastery-status.developing{border-color:#a8c8ed;background:#eef6ff;color:#174a7e}.mastery-status.review{border-color:#f4b5b5;background:#fff0f0;color:#8f2222}.mastery-status.limited{background:#faf9f7;color:#625f57}.dark .mastery-status.strong{background:#124a35;color:#d9fbe8}.dark .mastery-status.developing{background:#163d67;color:#e0efff}.dark .mastery-status.review{background:#5a2020;color:#ffe6e6}.dark .mastery-status.limited{background:#30302d;color:#e7e4dc}
.tool-titlebar{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.75rem}.tool-titlebar h2{margin:0}.tool-titlebar small{display:none;color:var(--muted);font-weight:700}.draggable-tool-dialog{position:fixed;inset:auto;margin:0}.draggable-tool-dialog .tool-titlebar{cursor:grab;user-select:none}.draggable-tool-dialog .tool-titlebar:active{cursor:grabbing}.draggable-tool-dialog .tool-titlebar small{display:block}
@media(max-width:700px){.skeleton-grid{grid-template-columns:1fr}.skeleton-block{min-height:5.5rem}.continue-card{align-items:flex-start;flex-direction:column}.continue-card button{width:100%}}
@media(prefers-reduced-motion:reduce){.skeleton-card,.skeleton-block,.skeleton-line,.completion-banner,.flashcard-streak-pop,.motion-ready .ring,.metric,.choice.selected,.choice.correct,.choice.incorrect{animation:none}.topic-card,.choice{transition:none}.topic-card:hover,.choice:not(:disabled):hover{transform:none}}