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.btn-stamp{--btn-bg:var(--stamp);--btn-fg:var(--on-stamp);--btn-line:var(--btn-ring);box-shadow:var(--lift-sm)}:where(.area-student,.area-landing) .btn-ink:hover,:where(.area-student,.area-landing) .btn-stamp:hover{--btn-bg:var(--stamp-hover)}:where(.area-student,.area-landing) .btn-sun{--btn-bg:var(--butter);--btn-fg:var(--stk-ink);--btn-line:var(--stk-edge);box-shadow:var(--lift-sm)}:where(.area-student,.area-landing) .btn-line{--btn-bg:var(--paper);--btn-fg:var(--ink);--btn-line:var(--rule-strong);border-width:2px}:where(.area-student,.area-landing) .btn-red{border-width:2px}:where(.area-student,.area-landing) .btn-quiet{border-width:0}:where(.area-student,.area-landing) .btn-sm{min-height:var(--ctl-h-sm);font-size:var(--t-body);padding-inline:var(--s-4);border-radius:14px}:where(.area-student,.area-landing) .btn-lg{min-height:58px;font-size:var(--t-lead)}:where(.area-student,.area-landing) .btn-icon{width:var(--tap);padding:0}:where(.area-student,.area-landing) 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var(--stk-edge);border-radius:var(--r-sheet)}@keyframes slap{0%{opacity:0;transform:scale(1.7)rotate(-24deg)}60%{opacity:1}to{transform:rotate(var(--r,-10deg));opacity:1}}@keyframes wob{0%,to{transform:rotate(var(--r,0deg))}50%{transform:rotate(calc(var(--r,0deg) + 1.5deg))}}@keyframes tok{0%{opacity:0}to{opacity:1}}@keyframes lift-in{0%{opacity:0;transform:translateY(16px) rotate(var(--r,0deg)) scale(.96)}to{opacity:1;transform:rotate(var(--r,0deg))}}.not-found{min-height:100dvh;padding:var(--s-5,24px) 16px;background:var(--ground);place-items:center;display:grid}.not-found .notice{text-align:center;width:100%;max-width:440px}.not-found-actions{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:16px;display:flex}.wordmark{gap:8px}.brand-mark{flex:none;display:inline-flex}.brand-mark img{filter:drop-shadow(0 2px 3px #00000040);border-radius:50%;display:block}.brand-mark.face{background:0 0}.brand-sticker{display:inline-block}.brand-sticker img{width:100%;max-width:100%;height:auto;display:block}.hero-art .owl.brand-sticker{filter:drop-shadow(0 14px 18px #00000059)}.area-student .sheet,.area-student .paper{--paper:#fff}.area-student .sheet{background:var(--sheet);border-radius:var(--r-sheet);box-shadow:var(--lift);color:var(--ink);border:0}.area-student .app.night{background-color:var(--ground)}.area-student .main{padding:var(--s-4) var(--s-4) calc(110px + env(safe-area-inset-bottom));overflow-x:clip}@media (width>=1000px){.area-student .main{padding:var(--s-6) var(--s-7) var(--s-8)}}.area-student .main-narrow{max-width:720px}.area-student .rail{background:var(--paper);border-inline-end:1px solid var(--rule);padding:var(--s-4);gap:var(--s-1)}.area-student .rail .brand.wordmark{padding:var(--s-1) var(--s-2) var(--s-4);font-size:2rem}.area-student .rail a.item{min-height:48px;color:var(--ink-2);transition:background-color .15s var(--ease-out), color .15s var(--ease-out);border-radius:14px;font-weight:700}.area-student .rail a.item[aria-current=page]{background:var(--butter);color:var(--stk-ink);box-shadow:var(--lift-sm)}@media (hover:hover){.area-student .rail a.item:not([aria-current=page]):hover{background:var(--paper-2);color:var(--ink)}}.area-student .credit{background:var(--paper-2);border:0;border-radius:18px}.area-student .credit a{color:var(--ink);text-underline-offset:5px;text-decoration:underline}.area-student .who .av{background:var(--pink);color:var(--stk-ink)}.area-student .topbar{background:color-mix(in oklab, var(--ground) 88%, transparent);min-height:64px;padding-inline:var(--s-4) var(--s-3);gap:var(--s-2);border-bottom:0}.area-student .topbar .wordmark{flex:none}.area-student .topbar .end{gap:var(--s-1)}.prog-chip{min-height:var(--tap);border-radius:var(--r-pill);background:var(--paper);box-shadow:inset 0 0 0 1px 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