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textarea::placeholder{color:#6a7b92;opacity:1}.composer-bar{justify-content:space-between;align-items:center;gap:12px;margin-top:4px;display:flex}.attach{color:var(--muted);border-radius:10px;align-items:center;gap:7px;margin-left:-8px;padding:7px 10px;font-size:14px;transition:background .2s,color .2s;display:flex}.attach:not(:disabled):hover{color:var(--ink);background:#eef3f7}.send{background:var(--primary);color:#fff;border-radius:12px;place-items:center;width:38px;height:38px;transition:background .2s;display:grid}.send:not(:disabled):hover{background:var(--primary-dark)}.send:disabled{opacity:1;color:#7d91b8;background:#e4ecfa}.send.stop{background:var(--ink)}.attached{width:fit-content;max-width:100%;color:var(--muted);background:#eef5f7;border-radius:10px;align-items:center;gap:7px;margin:0 0 8px -4px;padding:6px 8px 6px 10px;font-size:13px;display:flex}.attached-name{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;max-width:30ch;font-weight:550;overflow:hidden}.attached-meta{white-space:nowrap}.attached button{border-radius:6px;place-items:center;width:22px;height:22px;display:grid}.attached button:hover{background:#dce8ec}.notice{background:var(--error-surface);color:var(--error-ink);border-radius:10px;align-items:center;gap:9px;margin-bottom:10px;padding:10px 14px;font-size:14px;display:flex}.notice span{flex:1}.starters{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:14px;display:grid}.starter{text-align:left;transition:transform .25s var(--ease),filter .2s;border-radius:14px;align-items:flex-start;gap:11px;padding:14px;display:flex}.starter:hover{transform:translateY(-2px)}.starter strong{margin-bottom:4px;font-size:14px;font-weight:600;display:block}.starter span span{opacity:.88;font-size:13px;line-height:1.45;display:block}.starter>svg{margin-top:1px}.starter.yellow{background:var(--butter-soft);color:var(--butter-ink)}.starter.green{background:var(--mint);color:var(--mint-ink)}.starter.blue{background:var(--info-surface);color:#245f58}.sample-link{color:var(--primary-dark);grid-column:1/-1;justify-self:center;align-items:center;gap:6px;margin-top:8px;padding:6px 8px;font-size:14px;font-weight:550;display:flex}.quick-replies{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.quick-replies button{color:#43556e;background:#fff;border:1px solid #cfdce6;border-radius:99px;align-items:center;gap:6px;padding:7px 12px;font-size:13px;transition:border-color .2s,color .2s;display:flex}.quick-replies button:hover{border-color:var(--primary);color:var(--primary-dark)}.fine-print{text-align:center;color:#6a7b92;margin-top:9px;font-size:12px}@media (max-width:700px){.chat-header{height:56px;padding:0 16px}.brand{font-size:22px}.brand-symbol{width:28px;height:28px}.new-chat span{display:none}.new-chat{padding:8px}.chat-main{padding:0 14px}.chat-app:has(.is-empty) .chat-main{padding-top:44px}.hello h1{font-size:30px}.hello p{font-size:15px}.thread{padding-top:20px}.msg-user{max-width:88%}.msg-teacher{grid-template-columns:minmax(0,1fr);gap:8px}.teacher-avatar{border-radius:8px;width:26px;height:26px}.board{margin-inline:-6px;padding:5px}.board-head{padding:10px 8px 0 12px}.board-title{font-size:21px}.board-canvas{padding:2px 6px 8px}.tray-caption p{font-size:14px}.dock{padding:14px 12px 8px}.attach span{display:none}.composer{border-radius:18px;padding-left:16px}.starters{grid-template-columns:1fr;gap:8px}.starter span span{display:none}.starter{align-items:center;padding:12px 14px}.starter strong{margin:0}.attached-meta{display:none}.quick-replies{scrollbar-width:none;flex-wrap:nowrap;margin-inline:-12px;padding:0 12px 2px;overflow-x:auto}.quick-replies button{flex:none}.chat-app:not(:has(.is-empty)) .fine-print{display:none}.board-expanded{inset:6px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.board-failed span{flex:1;min-width:220px}.board-failed button{color:var(--primary-dark);align-items:center;gap:6px;padding:4px 2px;font-size:14px;font-weight:600;display:flex}.tray-next{padding:0 6px 0 41px;font-size:13px}.tray-dot-pending{place-items:center;width:22px;height:28px;display:grid}.tray-dot-pending:before{content:"";border:1.5px dashed #9fb2c2;border-radius:50%;width:9px;height:9px;animation:1.3s ease-in-out infinite breathe}.found-card{box-shadow:0 14px 34px -22px #203b3b66, 0 0 0 1px var(--line);background:#fff;border-radius:16px;margin:0;padding:14px 14px 10px}.found-head{align-items:center;gap:10px;margin-bottom:10px;display:flex}.found-head strong{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:15px;font-weight:600;overflow:hidden}.found-kind{background:var(--info-surface);color:#245f58;border-radius:7px;flex:none;align-items:center;gap:6px;padding:4px 9px;font-size:12px;font-weight:600;display:flex}.found-kind.sim{background:var(--mint);color:var(--mint-ink)}.diagram-frame{cursor:zoom-in;background:#fbfcfd;border-radius:10px;place-items:center;width:100%;padding:10px;display:grid}.diagram-frame img{width:auto;max-width:100%;height:auto;max-height:440px;display:block}.found-card figcaption{color:var(--ink);margin:10px 2px 0;font-size:14px;line-height:1.55}.found-credit{color:var(--muted);margin:8px 2px 0;font-size:12px;line-height:1.5}.found-credit a{color:var(--muted);text-underline-offset:2px}.sim-frame{aspect-ratio:16/10;background:#eef3f6;border-radius:10px;position:relative;overflow:hidden}.sim-frame iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.sim-launch{place-items:center;width:100%;display:grid;position:absolute;inset:0}.sim-launch img{object-fit:cover;filter:saturate(.9);width:100%;height:100%;position:absolute;inset:0}.sim-launch span{background:var(--primary);color:#fff;transition:transform .25s var(--ease);border-radius:12px;align-items:center;gap:8px;padding:11px 18px;font-size:15px;font-weight:600;display:flex;position:relative;box-shadow:0 10px 26px -12px #203b3baa}.sim-launch:hover span{transform:translateY(-2px)}.viewer{z-index:70;background:#1b2639f2;flex-direction:column;animation:.2s ease-out fade;display:flex;position:fixed;inset:0}.viewer-bar{color:#fff;align-items:center;gap:8px;padding:12px 16px;display:flex}.viewer-bar strong{text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:15px;font-weight:600;overflow:hidden}.viewer-bar span{text-align:center;font-variant-numeric:tabular-nums;opacity:.8;min-width:48px;font-size:13px}.viewer-bar button{color:#fff;background:#ffffff14;border-radius:9px;place-items:center;min-width:36px;height:36px;font-size:20px;display:grid}.viewer-bar button:not(:disabled):hover{background:#ffffff26}.viewer-stage{cursor:zoom-in;touch-action:none;flex:1;place-items:center;min-height:0;padding:12px 16px;display:grid;overflow:hidden}.viewer-stage.zoomed{cursor:grab}.viewer-stage img{-webkit-user-select:none;user-select:none;background:#fff;border-radius:8px;max-width:100%;max-height:100%;padding:12px;transition:transform .15s ease-out}.viewer-hint{text-align:center;color:#c9d3e0;padding:0 16px 14px;font-size:12px}.teacher-memory{margin-left:auto;margin-right:8px;position:relative}.teacher-memory summary{color:var(--muted);cursor:pointer;border-radius:9px;align-items:center;gap:7px;padding:8px 12px;font-size:14px;font-weight:550;list-style:none;display:flex}.teacher-memory summary::-webkit-details-marker{display:none}.teacher-memory summary:hover,.teacher-memory[open] summary{color:var(--ink);background:#eef3f7}.teacher-memory-panel{z-index:30;border:1px solid var(--line);width:min(340px,100vw - 32px);box-shadow:var(--elevation);background:#fff;border-radius:14px;gap:10px;padding:16px;font-size:14px;line-height:1.5;display:grid;position:absolute;top:calc(100% + 6px);right:0}.teacher-memory-panel>p{color:var(--muted)}.teacher-memory-panel ul{gap:6px;max-height:260px;margin:0;padding:0;list-style:none;display:grid;overflow:auto}.teacher-memory-panel li{background:var(--butter-soft);border-radius:9px;align-items:flex-start;gap:8px;padding:8px 10px;display:flex}.teacher-memory-panel li span{flex:1}.teacher-memory-panel li button{color:var(--muted);border-radius:6px;padding:2px}.teacher-memory-panel li button:hover{color:var(--error-ink);background:#fff}.teacher-memory-panel .text-button{color:var(--error-ink);justify-self:start;font-size:13px}.teacher-noted{color:var(--muted);align-items:center;gap:6px;margin:-8px 0 0;font-size:12px;display:flex}.grade-hint{background:var(--butter-soft);color:var(--butter-ink);border-radius:10px;gap:2px;margin-top:8px;padding:10px 12px;display:grid}.grade-hint strong{text-transform:uppercase;letter-spacing:.04em;font-size:12px}.grade-retry{color:var(--muted);margin-top:8px;font-size:14px}.quiz-summary-actions{flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px;display:flex}@media (max-width:700px){.teacher-memory summary span{display:none}}.found-kind.three{color:#5b3d99;background:#efe7fb}.found-kind.graph{background:var(--butter-soft);color:var(--butter-ink)}.model3d-frame{aspect-ratio:4/3;background:#1b2230;border-radius:10px;position:relative;overflow:hidden}.model3d-frame iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.chip-button{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:999px;align-items:center;gap:6px;padding:7px 12px;font-size:13px;font-weight:600;display:inline-flex}.chip-button:hover{background:#eef3f7}.chip-button.on,.chip-button[aria-pressed=true]{background:var(--info-surface);color:var(--primary-dark);border-color:#bfd0f5}.molecule-formula{color:var(--muted);font-variant-numeric:tabular-nums;flex:none;font-size:13px}.molecule-stage{aspect-ratio:4/3;box-shadow:inset 0 0 0 1px var(--line);touch-action:none;background:#fff;border-radius:10px;position:relative;overflow:hidden}.molecule-error{text-align:center;color:var(--muted);place-items:center;padding:20px;font-size:14px;display:grid;position:absolute;inset:0}.molecule-controls{flex-wrap:wrap;justify-content:flex-start;gap:8px;margin-top:10px}.math-steps{background:#f4f7fb;border-radius:14px;padding:20px 22px}.math-steps .activity-heading{color:#245f58}.math-steps h3{margin:0 0 12px;font-size:17px;font-weight:600}.math-steps ol{gap:10px;margin:0 0 12px;padding:0;list-style:none;display:grid}.math-steps li{box-shadow:0 0 0 1px var(--line);animation:step-in .35s var(--ease);background:#fff;border-radius:12px;grid-template-columns:26px minmax(0,1fr);align-items:start;gap:12px;padding:10px 12px;display:grid}.math-steps li.latest{box-shadow:0 0 0 2px #bfd0f5}.math-steps li .katex-display{margin:2px 0;overflow:auto hidden}.math-steps li p{color:var(--muted);margin:2px 0 0;font-size:14px}.math-step-num{background:var(--primary);color:#fff;border-radius:50%;place-items:center;width:26px;height:26px;margin-top:6px;font-size:13px;font-weight:600;display:grid}.math-answer{background:var(--mint);color:var(--mint-ink);border-radius:10px;align-items:center;gap:8px;margin:0 0 12px;padding:10px 14px;font-weight:600;display:flex}.math-steps .activity-controls{justify-content:flex-start;gap:16px}@keyframes step-in{0%{opacity:0;transform:translateY(6px)}}.graph-svg{background:#fff;border-radius:10px;width:100%;height:auto;display:block}.graph-tick{fill:#6a7b91;font-variant-numeric:tabular-nums;font-size:11px}.graph-cross{fill:#2e8b57;paint-order:stroke;stroke:#fff;stroke-width:4px;font-size:13px;font-weight:600}.graph-point{fill:#203b3b;paint-order:stroke;stroke:#fff;stroke-width:4px;font-size:13px;font-weight:600}.graph-legend{flex-wrap:wrap;gap:8px 18px;margin:10px 2px 0;font-size:14px;display:flex}.graph-legend>span{align-items:center;gap:8px;display:flex}.graph-legend i{border-radius:2px;flex:none;width:16px;height:4px}.graph-sliders{background:#f4f7fb;border-radius:12px;gap:10px;margin-top:12px;padding:12px 14px;display:grid}.graph-sliders>label{grid-template-columns:minmax(90px,auto) 1fr 52px;align-items:center;gap:12px;font-size:14px;display:grid}.graph-sliders input{width:100%;accent-color:var(--primary);min-height:28px}.graph-sliders output{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}@media (max-width:700px){.graph-sliders label{grid-template-columns:1fr 48px}.graph-sliders label span{grid-column:1/-1}}@media (prefers-reduced-motion:reduce){.math-steps li{animation:none}}.math-verified{background:var(--mint);color:var(--mint-ink);border-radius:999px;align-items:center;gap:4px;margin-left:8px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-flex}
:root{--coral:#f08a6c;--coral-soft:#fce6de;--coral-ink:#8a3a22;--blue-soft:#e7effd;--blue-ink:#2f4f8a;--mint-strong:#8fd3ae;--mint-deep:#2e7a55;--butter-deep:#e9c452;--card-shadow:0 10px 30px -18px #203b3b55;--bounce:cubic-bezier(.16,1,.3,1);--rail:224px;--tabbar:0px}input,select{color:var(--ink)}input:focus-visible,select:focus-visible{outline:none}kbd{font-family:var(--font-geist-mono),monospace;background:#00000012;border-radius:5px;padding:2px 6px;font-size:11px;font-weight:600}.muted{color:var(--muted);font-size:14px}.tag{letter-spacing:.02em;background:#ffffffb3;border-radius:6px;padding:2px 8px;font-size:11px;font-weight:650}.avatar{background:var(--butter);width:34px;height:34px;color:var(--ink);border-radius:11px;flex:none;place-items:center;font-size:15px;font-weight:700;display:grid;position:relative}.avatar.sm{border-radius:9px;width:28px;height:28px;font-size:13px}.app{grid-template-columns:var(--rail) minmax(0,1fr);min-height:100dvh;display:grid}.rail{border-right:1px solid var(--line);background:#fbfdfe;flex-direction:column;gap:18px;height:100dvh;padding:20px 14px 16px;display:flex;position:sticky;top:0}.rail-brand{letter-spacing:-.04em;color:var(--ink);align-items:center;gap:9px;padding:0 6px;font-size:24px;font-weight:750;text-decoration:none;display:flex}.rail-brand .brand-symbol{width:40px;height:40px;transition:transform .5s var(--bounce);background:0 0;border-radius:0;flex:none;margin:0}.rail-brand .brand-symbol img{object-fit:contain;width:100%;height:100%;display:block}.rail-brand:hover .brand-symbol{transform:rotate(-14deg)scale(1.08)}.rail ul{gap:4px;margin:0;padding:0;list-style:none;display:grid}.rail li a{color:#43556e;border-radius:13px;align-items:center;gap:12px;padding:7px 10px 7px 7px;font-size:15px;font-weight:550;text-decoration:none;transition:background .2s,color .2s;display:flex}.rail li a:hover{color:var(--ink);background:#eef3f7}.rail-icon{width:36px;height:36px;transition:transform .35s var(--bounce),background .2s,color .2s;background:#eef3f7;border-radius:11px;place-items:center;display:grid}.rail li a:hover .rail-icon{transform:translateY(-2px)rotate(-6deg)}.rail li a.on{background:var(--blue-soft);color:var(--primary-dark);font-weight:650}.rail li a.on .rail-icon{background:var(--primary);color:var(--butter);box-shadow:0 6px 14px -8px var(--primary)}.rail-me{text-align:left;border-radius:13px;align-items:center;gap:10px;margin-top:auto;padding:8px;transition:background .2s;display:flex}.rail-me:hover{background:#eef3f7}.rail-me-text{min-width:0;display:grid}.rail-me-text strong{text-overflow:ellipsis;white-space:nowrap;font-size:14px;overflow:hidden}.rail-me-text span{color:var(--muted);align-items:center;gap:5px;font-size:12px;display:flex}.hud{gap:8px;display:flex}.hud-streak,.hud-xp{font-variant-numeric:tabular-nums;height:38px;color:var(--muted);background:#eef3f7;border-radius:12px;align-items:center;gap:6px;padding:0 12px;font-size:14px;text-decoration:none;display:flex}.hud-streak strong,.hud-xp strong{color:var(--ink);font-size:15px}.hud-streak.lit{background:var(--coral-soft);color:#d9532f}.hud-streak.lit svg{transform-origin:50% 90%;animation:2.4s ease-in-out infinite flicker}@keyframes flicker{0%,to{transform:scale(1)rotate(0)}30%{transform:scale(1.08,1.12)rotate(-3deg)}60%{transform:scale(.97,1.03)rotate(2deg)}}.hud-xp{background:var(--butter-soft);color:var(--butter-ink);flex:1;position:relative;overflow:hidden}.hud-xp span{font-size:12px}.hud-xp i{height:3px;width:var(--fill);background:var(--butter-deep);transition:width .8s var(--ease);border-radius:0 3px 3px 0;position:absolute;bottom:0;left:0}.hud-xp[data-bump]{animation:pop .5s var(--bounce)}.hud-plan{height:38px;color:var(--primary-dark);background:var(--info-surface);transition:transform .3s var(--bounce),background .2s;border-radius:12px;flex:none;align-items:center;gap:5px;padding:0 11px;font-size:13px;font-weight:650;text-decoration:none;display:flex}.hud-plan:hover{background:#d8eae3;transform:translateY(-2px)rotate(-3deg)}.hud-plan.is-pro{color:var(--mint-ink);background:var(--mint)}.rail .hud-plan{display:none}.rail-pro{background:var(--info-surface);color:var(--primary-dark);transition:transform .3s var(--bounce),background .2s;border-radius:13px;grid-template-columns:22px 1fr;align-items:center;column-gap:8px;margin-top:auto;padding:10px 12px;font-size:14px;font-weight:650;text-decoration:none;display:grid}.rail-pro small{color:var(--muted);grid-column:2;font-size:12px;font-weight:500}.rail-pro:hover,.rail-pro.on{background:#d8eae3;transform:translateY(-1px)}.rail-pro.is-pro{background:var(--mint);color:var(--mint-ink)}.rail-pro+.rail-me{margin-top:0}@keyframes pop{40%{transform:scale(1.08)}}.xp-float{z-index:95;pointer-events:none;color:#9a6c00;text-shadow:0 1px #fff;animation:xp-up 1.1s var(--ease) forwards;font-size:15px;font-weight:750;position:fixed;transform:translate(-50%)}@keyframes xp-up{0%{opacity:0;transform:translate(-50%,6px)scale(.8)}20%{opacity:1;transform:translate(-50%,-6px)scale(1.1)}to{opacity:0;transform:translate(-50%,-42px)scale(1)}}.topbar{display:none}.app-body{flex-direction:column;min-width:0;display:flex}.app-main{flex-direction:column;flex:1;min-width:0;display:flex}.app-main>.chat-app{min-height:100dvh}.learn-title{color:var(--ink);align-items:center;gap:8px;font-size:17px;font-weight:650;display:flex}.learn-title svg{color:var(--primary)}.setup-note{background:var(--butter-soft);max-width:560px;color:var(--butter-ink);border-radius:16px;gap:14px;margin:15vh auto;padding:20px;line-height:1.6;display:flex}.page{width:100%;max-width:1080px;margin:0 auto;padding:40px 36px 80px}.page-head{margin-bottom:28px}.page-head.row{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:20px;display:flex}.page-head h1,.home-head h1{letter-spacing:-.035em;font-size:clamp(30px,3.6vw,42px);font-weight:700;line-height:1.1}.page-head p{color:var(--muted);text-wrap:pretty;max-width:60ch;margin-top:10px;font-size:16px;line-height:1.6}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.section-head h2,.list-title{letter-spacing:-.02em;font-size:20px;font-weight:650}.list-title{margin:36px 0 14px}.notice button{color:inherit;place-items:center;display:grid}.big-button{background:var(--primary);color:#fff;box-shadow:0 4px 0 var(--primary-dark), 0 12px 24px -14px var(--primary);border-radius:14px;justify-content:center;align-items:center;gap:10px;padding:14px 22px;font-size:16px;font-weight:650;text-decoration:none;transition:transform .15s,box-shadow .15s,background .2s;display:inline-flex}.big-button:not(:disabled):hover{box-shadow:0 5px 0 var(--primary-dark), 0 14px 26px -14px var(--primary);background:#3f70e0;transform:translateY(-1px)}.big-button:not(:disabled):active{box-shadow:0 1px 0 var(--primary-dark);transform:translateY(3px)}.big-button kbd{color:#fff;background:#ffffff2e}.big-button.as-span{pointer-events:none}.soft-button{background:var(--blue-soft);color:var(--primary-dark);border-radius:11px;align-items:center;gap:8px;padding:10px 15px;font-size:14px;font-weight:600;text-decoration:none;transition:background .2s;display:inline-flex}.soft-button:not(:disabled):hover{background:#d8e5fc}.primary-button{text-decoration:none}.icon-button{width:40px;height:40px;color:var(--muted);border-radius:12px;place-items:center;transition:background .2s,color .2s;display:grid}.icon-button:hover{color:var(--ink);background:#eaf0f4}.empty-state{text-align:center;box-shadow:0 0 0 1px var(--line);color:var(--muted);background:#fff;border-radius:20px;justify-items:center;gap:10px;padding:56px 20px;display:grid}.empty-state svg{color:var(--primary)}.empty-state strong{color:var(--ink);font-size:18px}.empty-state p{max-width:42ch;line-height:1.6}.empty-state.small{padding:36px 20px}.form-error{color:var(--error-ink);background:var(--error-surface);border-radius:10px;align-items:center;gap:8px;padding:10px 12px;font-size:14px;display:flex}.skeleton-path{background:linear-gradient(100deg,#eef3f7 30%,#f7fafc 50%,#eef3f7 70%) 0 0/300% 100%;border-radius:20px;height:320px;animation:1.4s linear infinite shimmer}@keyframes shimmer{to{background-position:-150% 0}}.hint-keys{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px;margin-top:28px;font-size:13px;display:flex}.login{grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);min-height:100dvh;display:grid}.login-panel{flex-direction:column;justify-content:center;width:100%;max-width:640px;margin:0 auto;padding:48px clamp(24px,7vw,96px);display:flex}.login-brand{margin-bottom:56px;padding:0}.login-brand .brand-symbol{width:48px;height:48px}.login h1{letter-spacing:-.035em;text-wrap:balance;isolation:isolate;font-size:clamp(32px,4vw,48px);font-weight:700;line-height:1.08}.login h1 span{color:var(--primary);white-space:nowrap;position:relative}.login h1 span:after{content:"";background:var(--butter);z-index:-1;border-radius:3px;height:.28em;position:absolute;bottom:.04em;left:-2px;right:-2px;transform:skew(-8deg)}.login-lede{color:var(--muted);max-width:44ch;margin-top:14px;font-size:17px;line-height:1.6}.login-switch{isolation:isolate;background:#eaf0f4;border-radius:14px;grid-template-columns:1fr 1fr;margin:32px 0 20px;padding:4px;display:grid;position:relative}.login-switch button{color:var(--muted);border-radius:11px;padding:10px;font-size:14px;font-weight:600;transition:color .2s}.login-switch button[aria-selected=true]{color:var(--ink)}.login-switch i{z-index:-1;width:calc(50% - 4px);transition:transform .45s var(--bounce);background:#fff;border-radius:11px;position:absolute;top:4px;bottom:4px;left:4px;box-shadow:0 2px 8px -3px #203b3b33}.login-switch i[data-mode=up]{transform:translate(100%)}.login-form{gap:14px;display:grid}.login-form label,.exam-form label{color:#43556e;gap:6px;font-size:13px;font-weight:600;display:grid}.login-form input,.exam-form input,.exam-form select,.inline-field input{background:#fff;border:1.5px solid #d5e0e8;border-radius:12px;outline:none;height:48px;padding:0 14px;font-size:16px;transition:border-color .2s,box-shadow .2s}.login-form input:focus,.exam-form input:focus,.exam-form select:focus,.inline-field input:focus{border-color:var(--primary);box-shadow:0 0 0 4px #16756b22}.login-form input::placeholder,.inline-field input::placeholder,.exam-form input::placeholder,.home-ask input::placeholder{color:#6a7b92}.login-form .big-button{margin-top:6px}.login-sent{justify-items:start;gap:14px;display:grid}.login-sent-icon{background:var(--mint);width:58px;height:58px;color:var(--mint-ink);border-radius:18px;place-items:center;display:grid}.login-sent p{color:var(--muted);line-height:1.6}.login-stage{background:var(--primary);position:relative;overflow:hidden}.login-stage:before{content:"";background:radial-gradient(circle at 30% 25%,#4c7be8 0,#0000 40%),radial-gradient(circle at 75% 80%,#2c59c2 0,#0000 45%);position:absolute;inset:-20%}.stage-card{color:var(--ink);background:#fff;border-radius:18px;align-items:center;gap:10px;padding:16px 18px;font-weight:600;animation:7s ease-in-out infinite drift;display:flex;position:absolute;box-shadow:0 24px 40px -22px #0b1a3a99}@keyframes drift{50%{translate:0 -12px}}.stage-flash{background:var(--butter-soft);flex-direction:column;justify-content:space-between;align-items:flex-start;width:min(320px,60%);min-height:150px;font-size:19px;line-height:1.4;top:14%;left:12%;rotate:-5deg}.stage-flash b{color:#4a5d76;background:#e3ecf2;border-radius:6px;padding:3px 8px;font-size:12px}.stage-streak{background:var(--coral-soft);color:#d9532f;flex-direction:column;gap:0;animation-delay:-2s;top:10%;right:10%;rotate:6deg}.stage-streak strong{color:var(--ink);margin-top:4px;font-size:40px;line-height:1}.stage-streak span{color:var(--coral-ink);font-size:12px}.stage-quiz{flex-direction:column;align-items:stretch;width:250px;animation-delay:-4s;top:48%;right:8%;rotate:-3deg}.stage-quiz span{background:#f2f6f9;border-radius:11px;align-items:center;gap:7px;padding:10px 12px;font-size:15px;display:flex}.stage-quiz span.ok{color:var(--mint-deep);background:#d6eedf;box-shadow:0 0 0 2px #56846e}.stage-quiz em{color:#9a6c00;font-size:13px;font-style:normal}.stage-exam{background:var(--mint);color:var(--mint-ink);animation-delay:-1s;bottom:12%;left:14%;rotate:4deg}.stage-exam strong{color:var(--ink);letter-spacing:-.04em;font-size:46px;line-height:1}.stage-exam span{font-size:14px;line-height:1.3}.stage-group{font-size:14px;animation-delay:-5s;bottom:9%;right:12%;rotate:-2deg}.stage-group .dots{padding-left:6px;display:flex}.stage-group .dots i{background:var(--butter);border:2px solid #fff;border-radius:8px;width:24px;height:24px;margin-left:-6px}.stage-group .dots i:nth-child(2){background:var(--mint-strong)}.stage-group .dots i:nth-child(3){background:var(--coral)}.home-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px;display:flex}.home-date{color:var(--muted);margin-bottom:6px;font-size:14px}.home-ask{box-shadow:var(--elevation),0 0 0 1px var(--line);background:#fff;border-radius:16px;flex:0 420px;align-items:center;gap:10px;padding:6px 6px 6px 16px;transition:box-shadow .2s;display:flex}.home-ask:focus-within{box-shadow:var(--elevation),0 0 0 2px var(--primary)}.home-ask>svg{color:var(--primary)}.home-ask input{background:0 0;border:0;outline:none;flex:1;min-width:0;height:40px;padding:0;font-size:16px}.home-ask button{background:var(--primary);color:#fff;border-radius:12px;place-items:center;width:40px;height:40px;display:grid}.home-grid{grid-template-columns:minmax(0,1.35fr) minmax(300px,1fr);align-items:start;gap:22px;display:grid}.path-card{box-shadow:0 0 0 1px var(--line);background:#fff;border-radius:24px;padding:24px 26px 28px}.path{gap:22px;margin:0;padding:30px 0 0 12px;list-style:none;display:grid}.path-step{--x:calc(sin(var(--i) * 108.862deg) * 46px);translate:var(--x) 0;animation:step-in .6s var(--bounce) both;animation-delay:calc(var(--i) * 80ms);align-items:center;gap:18px;display:flex;position:relative}@keyframes step-in{0%{opacity:0;transform:translateY(16px)scale(.9)}}.path-step+.path-step:before{content:"";background:radial-gradient(circle,#c3d1dc 3px,#0000 3.5px) 0 0/12px 9px repeat-y;width:12px;height:18px;position:absolute;top:-21px;left:26px}.path-step.current+.path-step:before{top:-17px}.path-node{color:#fff;background:var(--node,var(--primary));width:64px;height:64px;box-shadow:0 6px 0 var(--node-dark,var(--primary-dark));transition:transform .2s var(--bounce),box-shadow .2s;border-radius:50%;flex:none;place-items:center;text-decoration:none;display:grid;position:relative}a.path-node:hover{box-shadow:0 9px 0 var(--node-dark,var(--primary-dark));transform:translateY(-3px)}a.path-node:active{box-shadow:0 2px 0 var(--node-dark);transform:translateY(4px)}.path-step.blue{--node:var(--primary);--node-dark:var(--primary-dark)}.path-step.butter{--node:#e2ae1c;--node-dark:#ad820c}.path-step.mint{--node:#3a9c6c;--node-dark:#27744e}.path-step.coral{--node:#e2664a;--node-dark:#b04a2f}.path-step.done .path-node{--node:#d9e3ea;--node-dark:#bccad5;color:var(--mint-deep)}.path-step.done .path-text strong{color:var(--muted);-webkit-text-decoration:line-through #9fb2c2;text-decoration:line-through #9fb2c2}.path-step.current .path-node{width:78px;height:78px;animation:hop 2.2s var(--ease) infinite;margin:0 -7px}.path-step.current .path-node:after{content:"";border:3px solid var(--node);opacity:.35;animation:ring 2.2s var(--ease) infinite;border-radius:50%;position:absolute;inset:-9px}@keyframes hop{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-7px)}}@keyframes ring{0%{opacity:.5;transform:scale(.85)}to{opacity:0;transform:scale(1.25)}}.path-bubble{background:var(--ink);color:#fff;letter-spacing:.03em;white-space:nowrap;border-radius:9px;padding:4px 11px;font-size:12px;font-weight:700;position:absolute;top:-30px;left:50%;translate:-50%}.path-bubble:after{content:"";border:6px solid #0000;border-bottom:0;border-top-color:var(--ink);position:absolute;bottom:-5px;left:50%;translate:-50%}.path-text{gap:3px;min-width:0;display:grid}.path-text strong{letter-spacing:-.01em;font-size:17px;font-weight:650}.path-text span{color:var(--muted);font-size:14px}.path-step.chest .path-node{--node:#f3e7c2;--node-dark:#dcc88e;color:#9a6c00}.path-step.chest.open .path-node{--node:var(--butter);animation:wiggle 1s var(--bounce) 2}@keyframes wiggle{25%{rotate:-10deg}75%{rotate:10deg}}.home-side{gap:18px;display:grid}.streak-card{box-shadow:0 0 0 1px var(--line);background:#fff;border-radius:24px;padding:22px}.streak-top{align-items:center;gap:14px;display:flex}.streak-flame{color:#9fb2c2;background:#eef3f7;border-radius:18px;place-items:center;width:60px;height:60px;display:grid}.streak-card.lit .streak-flame{background:var(--coral-soft);color:#d9532f}.streak-card.lit .streak-flame svg{transform-origin:50% 90%;animation:2.4s ease-in-out infinite flicker}.streak-top strong{letter-spacing:-.04em;font-variant-numeric:tabular-nums;font-size:38px;line-height:1;display:block}.streak-top span{color:var(--muted);font-size:14px}.week{grid-template-columns:repeat(7,1fr);gap:6px;margin:20px 0 0;padding:0;list-style:none;display:grid}.week li{color:var(--muted);justify-items:center;gap:6px;font-size:12px;font-weight:600;display:grid}.week i{color:#fff;background:#eef3f7;border-radius:50%;place-items:center;width:30px;height:30px;display:grid}.week li.hit i{animation:pop .5s var(--bounce) both;background:#e2664a}.week li.today span{color:var(--ink)}.week li.today i{box-shadow:0 0 0 2px #fff,0 0 0 4px #e2664a}.week li.today:not(.hit) i{box-shadow:0 0 0 2px #fff,0 0 0 4px #c3d1dc}.goal{border-top:1px dashed #d5e0e8;margin-top:20px;padding-top:18px}.goal-row{color:var(--muted);justify-content:space-between;font-size:14px;display:flex}.goal-row strong{color:var(--butter-ink);font-variant-numeric:tabular-nums}.goal-bar{background:#f3eedd;border-radius:99px;height:14px;margin:10px 0;overflow:hidden}.goal-bar i{height:100%;transition:width 1s var(--ease);background:linear-gradient(#f6d46a,#e2ae1c);border-radius:99px;min-width:14px;display:block;box-shadow:inset 0 -3px #0000001a,inset 0 3px #fff6}.goal p{color:var(--muted);font-size:14px;line-height:1.5}.exam-ticket{background:var(--mint);color:var(--mint-ink);transition:transform .25s var(--bounce);border-radius:20px;align-items:center;gap:16px;padding:18px 20px;text-decoration:none;display:flex;position:relative}.exam-ticket:hover{transform:rotate(-1deg)translateY(-2px)}.exam-ticket:before,.exam-ticket:after{content:"";background:var(--canvas);border-radius:50%;width:16px;height:16px;position:absolute;left:92px}.exam-ticket:before{top:-8px}.exam-ticket:after{bottom:-8px}.exam-ticket.empty:before,.exam-ticket.empty:after{display:none}.exam-ticket.empty{background:var(--blue-soft);color:var(--blue-ink)}.ticket-count{text-align:center;border-right:2px dashed #fff;flex:none;width:64px;padding-right:14px}.ticket-count strong{letter-spacing:-.04em;color:var(--ink);font-variant-numeric:tabular-nums;font-size:34px;line-height:1;display:block}.ticket-count span{font-size:12px;font-weight:600}.ticket-info{gap:3px;min-width:0;display:grid}.ticket-info strong{color:var(--ink);font-size:17px}.ticket-info span{font-size:13px}.ticket-label{font-weight:650}.shelf{margin-top:40px}.shelf-actions{flex-wrap:wrap;gap:8px;display:flex}.upload-status{background:var(--blue-soft);color:var(--blue-ink);border-radius:12px;align-items:center;gap:10px;margin-bottom:14px;padding:12px 14px;font-size:14px;display:flex}.drop-zone{width:100%;color:var(--muted);background:#fbfdff;border:2px dashed #bfd0e6;border-radius:22px;justify-items:center;gap:8px;margin-bottom:14px;padding:40px 20px;transition:border-color .2s,background .2s;display:grid}.drop-zone:hover{border-color:var(--primary);background:var(--blue-soft)}.drop-zone strong{color:var(--ink);font-size:17px}.drop-zone>span:last-child{max-width:44ch;font-size:14px;line-height:1.55}.drop-icon{background:var(--primary);width:56px;height:56px;color:var(--butter);border-radius:18px;place-items:center;display:grid;rotate:-6deg}.shelf-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:0;padding:0;list-style:none;display:grid}.book{--bg:var(--blue-soft);--fg:var(--blue-ink);background:var(--bg);color:var(--fg);min-height:168px;transition:transform .3s var(--bounce);border-radius:18px;flex-direction:column;gap:8px;padding:16px;display:flex}.book:hover{transform:translateY(-3px)rotate(-.6deg)}.book.mint{--bg:var(--mint);--fg:var(--mint-ink)}.book.butter{--bg:var(--butter-soft);--fg:var(--butter-ink)}.book.coral{--bg:var(--coral-soft);--fg:var(--coral-ink)}.book-top{align-items:center;gap:8px;display:flex}.book-icon{background:#ffffffb3;border-radius:11px;place-items:center;width:34px;height:34px;display:grid}.book-delete{opacity:0;width:30px;height:30px;color:inherit;border-radius:9px;place-items:center;margin-left:auto;transition:opacity .2s,background .2s;display:grid}.book:hover .book-delete,.book-delete:focus-visible{opacity:1}.book-delete:hover{background:#fff9}.book-title{color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:16px;font-weight:650;line-height:1.35;display:-webkit-box;overflow:hidden}.book-meta{font-size:12px}.book-actions{gap:6px;margin-top:auto;display:flex}.book-actions a{color:var(--fg);background:#ffffffc2;border-radius:10px;align-items:center;gap:6px;padding:7px 11px;font-size:13px;font-weight:650;text-decoration:none;transition:background .2s;display:flex}.book-actions a:hover{background:#fff}.review-hero{text-align:left;background:var(--butter-soft);width:100%;color:var(--butter-ink);transition:transform .3s var(--bounce);border-radius:24px;align-items:center;gap:24px;padding:26px 28px;display:flex}.review-hero:not(:disabled):hover{transform:translateY(-2px)}.review-hero:disabled{opacity:1;cursor:default}.review-hero.calm{background:var(--mint);color:var(--mint-ink)}.review-hero-text{flex:1;gap:4px;display:grid}.review-hero-text strong{letter-spacing:-.02em;color:var(--ink);font-size:24px}.review-stack{flex:none;width:74px;height:84px;position:relative}.review-stack i{transition:rotate .4s var(--bounce);background:#fff;border-radius:12px;position:absolute;inset:0;box-shadow:0 6px 14px -8px #203b3b55}.review-stack i:first-child{background:#f6e3a6;rotate:-12deg}.review-stack i:nth-child(2){background:#fcf4da;rotate:-4deg}.review-stack i:nth-child(3){rotate:6deg}.review-hero:not(:disabled):hover .review-stack i:first-child{rotate:-18deg}.review-hero:not(:disabled):hover .review-stack i:nth-child(3){rotate:12deg}.deck-list{gap:8px;margin:0;padding:0;list-style:none;display:grid}.deck-list button{width:100%;box-shadow:0 0 0 1px var(--line);text-align:left;background:#fff;border-radius:16px;grid-template-columns:minmax(0,1fr) 160px auto 20px;align-items:center;gap:18px;padding:16px 18px;transition:box-shadow .2s,transform .2s;display:grid}.deck-list button:hover{box-shadow:0 0 0 2px var(--primary);transform:translate(3px)}.deck-title{text-overflow:ellipsis;white-space:nowrap;font-weight:600;overflow:hidden}.deck-bar{background:#eef3f7;border-radius:99px;height:10px;overflow:hidden}.deck-bar i{background:var(--mint-strong);border-radius:99px;height:100%;display:block}.deck-counts{gap:6px;font-size:12px;display:flex}.deck-counts b{white-space:nowrap;border-radius:7px;padding:3px 8px;font-weight:650}.deck-counts .due{background:var(--coral-soft);color:var(--coral-ink)}.deck-counts .new{background:var(--blue-soft);color:var(--blue-ink)}.session{flex-direction:column;flex:1;width:100%;max-width:760px;min-height:100dvh;margin:0 auto;padding:24px 24px 32px;display:flex}.session-bar{align-items:center;gap:14px;display:flex}.session-progress{background:#e4ebf0;border-radius:99px;flex:1;height:16px;overflow:hidden}.session-progress i{background:linear-gradient(#5c8bf0,var(--primary));height:100%;transition:width .5s var(--bounce);border-radius:99px;min-width:16px;display:block;box-shadow:inset 0 3px #fff4}.session-count{color:var(--muted);font-variant-numeric:tabular-nums;min-width:44px;font-size:14px;font-weight:650}.combo-chip{color:#c2471f;animation:pop .45s var(--bounce);white-space:nowrap;align-items:center;gap:4px;font-size:14px;font-weight:750;display:flex}.combo-chip:empty{display:none}.combo-chip.hot{background:var(--coral-soft);border-radius:10px;padding:5px 10px}.card-arena{perspective:1400px;flex:1;place-items:center;min-height:380px;margin:28px 0 22px;display:grid;position:relative}.ghost{width:min(560px,100%);height:340px;box-shadow:var(--card-shadow);background:#fff;border-radius:26px;position:absolute}.ghost.g1{background:#f3f6f9;translate:0 10px;rotate:3deg}.ghost.g2{background:#eaf0f4;translate:0 18px;rotate:-4deg}.flip-card{z-index:2;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;width:min(560px,100%);height:340px;transition:transform .45s var(--bounce),opacity .25s;position:relative}.flip-card.dragging{cursor:grabbing;transition:none}.flip-card:focus-visible{outline:none}.flip-card:focus-visible .face{box-shadow:0 0 0 3px var(--primary),var(--card-shadow)}.flip-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s var(--bounce);position:relative}.flip-card.flipped .flip-inner{transform:rotateY(180deg)}.face{backface-visibility:hidden;text-align:center;box-shadow:var(--card-shadow);border-radius:26px;flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:26px 30px;display:flex;position:absolute;inset:0}.face p{letter-spacing:-.015em;text-wrap:balance;max-width:28ch;color:var(--ink);font-size:clamp(20px,2.6vw,26px);font-weight:600;line-height:1.4}.face.front{background:var(--butter-soft);color:var(--butter-ink)}.face.back{background:var(--mint);color:var(--mint-ink);transform:rotateY(180deg)}.face-label{align-items:center;gap:6px;font-size:13px;font-weight:650;display:flex;position:absolute;top:20px;left:24px}.face-tip{font-size:13px;position:absolute;bottom:18px}.face blockquote .page-chip{font-size:12px}.face blockquote{color:#3f5e4f;max-width:46ch;margin:0;font-size:13px;line-height:1.5}.flip-card.hint-good .face.back{box-shadow:0 0 0 4px var(--mint-deep),var(--card-shadow)}.flip-card.hint-again .face.back{box-shadow:0 0 0 4px #c2394a,var(--card-shadow)}.flip-card.hint-easy .face.back{box-shadow:0 0 0 4px var(--primary),var(--card-shadow)}.stamp{z-index:3;letter-spacing:.02em;text-transform:uppercase;animation:pop .3s var(--bounce);background:#fff;border:3px solid;border-radius:10px;padding:6px 14px;font-size:20px;font-weight:800;position:absolute;top:24px;right:24px;rotate:12deg}.stamp.good{color:var(--mint-deep)}.stamp.again{color:#c2394a;left:24px;right:auto;rotate:-12deg}.stamp.easy{color:var(--primary)}.flip-card.leave-right{opacity:0;transform:translate(130%,20px)rotate(18deg)!important}.flip-card.leave-left{opacity:0;transform:translate(-130%,20px)rotate(-18deg)!important}.flip-card.leave-up{opacity:0;transform:translateY(-120%)rotate(-4deg)scale(.9)!important}.rate-row{grid-template-columns:repeat(4,1fr);gap:10px;min-height:74px;display:grid}.rate-row .flip-button{grid-column:1/-1}.rate{box-shadow:0 4px 0 var(--rate-dark);background:var(--rate-bg);color:var(--rate-fg);animation:step-in .4s var(--bounce) both;border-radius:16px;justify-items:center;gap:2px;padding:12px 8px;font-weight:650;transition:transform .15s,box-shadow 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