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150)}.fx-paper__cover{aspect-ratio:480/680;background:var(--st-surface);border-radius:14px;position:relative;overflow:hidden}.fx-paper__scan{object-fit:cover;opacity:0;width:100%;height:100%;transition:opacity .4s;position:absolute;inset:0}.fx-paper__scan.is-loaded{opacity:1}.fx-sk{gap:calc(14 * var(--u));padding:calc(14 * var(--u));flex-direction:column;transition:opacity .2s;animation:.2s fxFadeIn;display:flex;position:absolute;inset:0}.fx-sk.is-out{opacity:0}.fx-sk.is-out .fx-sk__block{animation-play-state:paused}.fx-sk__block{border-radius:calc(2 * var(--u));background:linear-gradient(90deg,#ececec 25%,#f6f8fb 50%,#ececec 75%) 0 0/600px 100%;animation:1.2s linear infinite fxSweep}.fx-sk__block--art{height:44%}.fx-sk__block--title{height:calc(9 * var(--u))}.fx-sk__block--line{height:calc(7 * var(--u));width:62%}.fx-sk__block--tag{height:calc(11 * var(--u));width:42%;margin-top:auto}.fx-tile{--paper-sans:"Carlito", "Calibri", "Segoe UI", sans-serif;--paper-serif:"Caladea", "Cambria", Georgia, serif;--paper-arc:#dbeee2;aspect-ratio:480/680;padding:calc(14 * var(--u)) calc(14 * var(--u)) calc(12 * var(--u));background:#fff;border:1px solid #0000000d;border-radius:14px;flex-direction:column;display:flex;position:relative;overflow:hidden}.fx-tile.is-settled{animation:.42s cubic-bezier(.33,1,.68,1) fxTileSettle}.fx-tile__part{opacity:0;transform:translateY(calc(6 * var(--u)));transition:opacity .22s,transform .22s cubic-bezier(.33,1,.68,1)}.fx-tile__part.is-in{opacity:1;transform:translateY(0)}.fx-tile__arc{top:calc(-64 * var(--u));right:calc(-64 * var(--u));width:calc(150 * var(--u));height:calc(150 * var(--u));background:var(--paper-arc);z-index:0;border-radius:50%;position:absolute}.fx-tile__code,.fx-tile__cover,.fx-tile__foot,.fx-tile__bar{z-index:1;position:relative}.fx-tile__code{font-family:var(--paper-sans);font-size:calc(8.5 * var(--u));color:#1a1a1a;justify-content:space-between;font-weight:700;display:flex}.fx-tile__cover{text-align:center;margin-top:calc(18 * var(--u));font-family:var(--paper-serif);flex-direction:column;align-items:center;display:flex}.fx-tile__eyebrow{font-size:calc(8.5 * var(--u));color:#444}.fx-tile__title{margin-top:calc(5 * var(--u));font-size:calc(14.5 * var(--u));color:#000;-webkit-line-clamp:3;-webkit-box-orient:vertical;line-height:1.18;display:-webkit-box;overflow:hidden}.fx-tile__level{margin-top:calc(6 * var(--u));font-size:calc(9.5 * var(--u));color:#555;font-weight:400}.fx-tile__foot{justify-content:space-between;align-items:center;gap:calc(6 * var(--u));margin-top:auto;display:flex}.fx-tile__subject{text-overflow:ellipsis;white-space:nowrap;min-width:0;font-family:Montserrat,sans-serif;font-size:calc(8.5 * var(--u));letter-spacing:.08em;text-transform:uppercase;color:#3f9268;font-weight:800;overflow:hidden}.fx-tile__badge{font-family:Montserrat,sans-serif;font-size:calc(8 * var(--u));letter-spacing:.06em;text-transform:uppercase;padding:calc(3 * var(--u)) calc(7 * var(--u));color:#5b97e9;background:#5b97e91f;border-radius:999px;flex-shrink:0;font-weight:800}.fx-tile__bar{margin-top:calc(8 * var(--u));height:calc(4 * var(--u));background:#ececec;border-radius:0}.fx-paper__cap{color:var(--st-ink);min-height:2.5em;font-size:11.5px;font-weight:600;line-height:1.25}.fx-gen{background:var(--st-surface);border-radius:14px;outline:2px solid #0000;align-items:center;gap:8px;padding:7px 8px;transition:outline-color .25s;display:flex}.fx-gen.is-focus{outline-color:var(--st-blue)}.fx-gen__subject{background:var(--st-grey);color:var(--st-ink);white-space:nowrap;border-radius:999px;flex-shrink:0;padding:4px 9px;font-size:11.5px;font-weight:600}.fx-gen__field{background:var(--st-grey);border-radius:999px;flex:1;align-items:center;gap:6px;min-width:0;height:26px;padding:0 10px;display:flex;overflow:hidden}.fx-gen__label{color:var(--st-muted);flex-shrink:0;font-size:11.5px}.fx-gen__typed{color:var(--st-ink);white-space:nowrap;font-size:11.5px}.fx-gen__tag{background:var(--st-blue-wash-2);color:var(--st-blue-deep);white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:11px;font-weight:700;display:inline-flex}.fx-gen__x{opacity:.6}.fx-gen__btn{background:var(--st-blue);color:var(--st-surface);white-space:nowrap;border-radius:999px;flex-shrink:0;padding:6px 12px;font-size:11.5px;font-weight:700;transition:transform .12s}.fx-gen__btn.is-pressed{transform:scale(.96)}.fx-gen__note{min-height:16px;color:var(--st-muted);font-size:11px;transition:opacity .25s}.fx-chat{flex-direction:column;flex:1;gap:12px;display:flex}.fx-chat__thread{flex-direction:column;flex:1;justify-content:flex-end;gap:10px;min-height:156px;display:flex;overflow:hidden}.fx-bubble{border-radius:16px;max-width:86%;padding:9px 13px;font-size:13px;line-height:1.45;animation:.3s ease-out both fxRise}.fx-bubble--me{background:var(--st-blue);color:var(--st-surface);border-bottom-right-radius:6px;align-self:flex-end}.fx-bubble--them{background:var(--st-grey);color:var(--st-ink);border-bottom-left-radius:6px;align-self:flex-start;min-height:39px}.fx-bubble--dots{align-items:center;gap:5px;display:flex}.fx-bubble--dots span{background:var(--st-muted);border-radius:50%;width:6px;height:6px;animation:1s ease-in-out infinite fxDot}.fx-bubble--dots span:nth-child(2){animation-delay:.15s}.fx-bubble--dots span:nth-child(3){animation-delay:.3s}.fx-chat__bar{background:var(--st-surface);border-radius:15px;align-items:center;gap:7px;height:50px;padding:0 7px 0 9px;display:flex}.fx-chat__subject{background:var(--st-grey);color:var(--st-ink);border-radius:999px;flex-shrink:0;padding:4px 8px;font-size:11px;font-weight:600}.fx-chat__field{min-width:0;max-height:2.7em;color:var(--st-ink);flex:1;font-size:12.5px;line-height:1.35;overflow:hidden}.fx-chat__ph{color:var(--st-muted)}.fx-caret{vertical-align:-2px;background:var(--st-ink);width:1.5px;height:1em;margin-left:1px;animation:.9s step-end infinite fxBlink;display:inline-block}.fx-chat__send{background:var(--st-blue);width:31px;height:31px;color:var(--st-surface);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;transition:transform .12s;display:flex}.fx-chat__send svg{width:15px;height:15px}.fx-chat__send.is-pressed{transform:scale(.9)}.fx-adapt{--rec-shift:72px;flex-direction:column;align-items:flex-start;gap:10px;display:flex}.fx-adapt__feed{flex-wrap:wrap;align-self:stretch;align-items:center;gap:8px 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solid #0000;align-items:center;gap:14px;height:62px;padding:0 14px;transition:transform .5s cubic-bezier(.33,1,.68,1),outline-color .3s;display:flex}.fx-rec__row--1{background:var(--st-mcq-1)}.fx-rec__row--2{background:var(--st-mcq-2)}.fx-rec__row--3{background:var(--st-mcq-4)}.fx-rec__row.is-hot{outline-color:var(--st-wrong)}.fx-rec__left{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.fx-rec__topic{color:var(--st-ink);white-space:nowrap;text-overflow:ellipsis;font-size:13.5px;font-weight:600;overflow:hidden}.fx-rec__reason{height:20px;position:relative}.fx-rec__reason span{color:var(--st-muted);white-space:nowrap;background:#ffffffb8;border-radius:999px;padding:2px 8px;font-size:11px;transition:opacity .3s;position:absolute;top:0;left:0}.fx-rec__reason--hot{color:var(--st-wrong);font-weight:700}.fx-rec__bar{background:#ffffffb8;border-radius:999px;flex-shrink:0;width:120px;height:6px;overflow:hidden}.fx-rec__fill{background:var(--st-blue);border-radius:999px;height:100%;transition:width .9s cubic-bezier(.22,1,.36,1),background-color .4s;display:block}.is-hot .fx-rec__fill{background:var(--st-wrong)}.fx-rec__num{text-align:right;width:26px;color:var(--st-ink);flex-shrink:0;font-size:13px;font-weight:700;transition:color .4s}.is-hot .fx-rec__num{color:var(--st-wrong)}.fx-adapt__note{min-height:18px;color:var(--st-muted);font-size:12.5px;transition:opacity .3s}@media (width<=1023px){.f-upload,.f-feed,.f-leaderboard,.f-papers,.f-teacher{grid-column:span 6}.f-adaptive{grid-column:span 12}}@media (width<=639px){.features-grid{grid-template-columns:minmax(0,1fr);gap:16px}.feature-card{border-radius:24px;padding:22px;grid-column:1/-1!important}.feature-card h3{font-size:20px}.feature-card p{font-size:14.5px}.fx-gap__sentence{font-size:14px}.fx-gap__slot{min-width:84px}.fx-paper:last-child{display:none}.fx-shelf{gap:8px}.fx-gen{flex-wrap:wrap}.fx-gen__field{flex-basis:100%;order:3}.fx-chat__thread{min-height:190px}.fx-bubble{max-width:90%;font-size:13.5px}.fx-rec{padding:14px}.fx-rec__bar{width:64px}.fx-rec__row{gap:10px;padding:0 10px}.fx-adapt__label{display:none}}@media (prefers-reduced-motion:reduce){.features-grid *,.features-grid :before,.features-grid :after{transition:none!important;animation:none!important}}