@import"https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Libre+Caslon+Display&display=swap";:root{font-family:DM Sans,sans-serif;color:#202b42;background:#f7f9ff;font-synthesis:none;font-size:16px}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #6488ed;outline-offset:4px}button{transition:background .18s,transform .18s}button:hover:not(:disabled){background:#edf1fa}button:active:not(:disabled){transform:scale(.96)}.app{max-width:1240px;margin:auto;padding:0 58px;height:100dvh;display:grid;grid-template-columns:1fr 510px;grid-template-rows:108px 1fr;column-gap:90px}header{grid-column:1/-1;display:flex;align-items:center;gap:20px}.wordmark{display:flex;align-items:center;gap:10px;color:#202b42;text-decoration:none;font-size:29px;font-weight:700;letter-spacing:-1.7px}.wordmark img{width:30px;height:30px}.wordmark>span{font-size:17px;color:#7fa0ed;align-self:flex-start}.topnote{margin-left:auto;color:#778096;font-size:14px}.icon{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#fff;box-shadow:0 2px 8px #24335908}.account span{color:#3265e8;font-weight:700}.sidebar{padding-top:105px;position:relative}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;color:#7c88a0}.sidebar h1{font-family:Libre Caslon Display,Georgia,serif;font-size:48px;line-height:1.13;font-weight:400;letter-spacing:-1.2px;margin:26px 0 22px}.intro{color:#7b859b;font-size:16px;line-height:1.8}.side-nav{display:grid;gap:10px;margin-top:46px;max-width:220px}.side-nav button{display:flex;align-items:center;gap:15px;padding:15px 20px;border-radius:17px;text-align:left;color:#73809a;font-size:15px}.side-nav button.active{background:#eaf0ff;color:#3265e8;font-weight:600}.side-footer{font-size:12px;color:#8d96a8;margin-top:65px}main{min-height:0;display:flex;flex-direction:column;padding-bottom:28px}.feed-toolbar{display:flex;align-items:center;justify-content:space-between;min-height:56px;padding:0 8px 12px;font-size:14px;color:#748099}.filter{border-radius:30px;background:#fff;display:flex;align-items:center;gap:8px;padding:10px 14px;font-size:13px;color:#43536e}.filter b{font-size:11px;color:#3265e8}.feed{flex:1;min-height:0;overflow-y:auto;scroll-snap-type:y mandatory;scrollbar-width:none;overscroll-behavior:contain}.feed::-webkit-scrollbar{display:none}.page{height:100%;scroll-snap-align:start;scroll-snap-stop:always;display:flex;flex-direction:column;padding:6px 8px 0}article{background:#fff;border-radius:30px;box-shadow:0 5px 20px #3d538508;flex:1;display:flex;flex-direction:column;min-height:340px;padding:28px 32px;position:relative;border:1px solid #eef1f8}.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.topic{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:500}.topic-symbol{color:var(--topic);background:color-mix(in srgb,var(--topic) 11%,white);width:37px;height:37px;border-radius:12px;display:grid;place-items:center;font:26px Georgia,serif}.level{display:flex;align-items:flex-end;gap:3px;padding:9px;border-radius:9px}.level i{width:3px;background:#e5e9f0;border-radius:2px;height:7px}.level i:nth-child(2){height:10px}.level i:nth-child(3){height:13px}.level i:nth-child(4){height:16px}.level i:nth-child(5){height:19px}.level i.filled{background:var(--topic)}.level>span{font-size:12px;color:#8490a4;margin-left:5px}.question{margin:auto 0;padding:40px 0}.question-title{font-size:13px;color:var(--topic);font-weight:500;margin-bottom:20px;letter-spacing:.2px}.question h2{font-family:Libre Caslon Display,Georgia,serif;font-size:42px;line-height:1.16;letter-spacing:-.6px;font-weight:400;margin:0;color:#25314a}.open-label{display:inline-block;margin-top:22px;font-size:11px;color:#8b6997;background:#f7f0f8;padding:6px 10px;border-radius:7px}.card-bottom{display:flex;align-items:center;justify-content:space-between}.definitions{display:flex;align-items:center;gap:8px;font-size:13px;color:#748099;border-radius:10px;padding:8px 0}.little-star{font-size:29px;color:color-mix(in srgb,var(--topic) 35%,white)}.under-card{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 15px;flex-shrink:0}.under-card>span{color:#8b95a8;font-size:12px}.save-folders{display:flex;gap:12px}.save-folders button{color:var(--folder);height:43px;width:43px;border-radius:14px;background:color-mix(in srgb,var(--folder) 9%,white);position:relative;display:grid;place-items:center}.shape{position:absolute;top:19px;font-size:9px;line-height:9px}.save-folders button[aria-pressed=true] .shape{color:#fff;top:18px}.feed-bottom{display:flex;align-items:center;justify-content:space-between;padding:6px 13px 0;color:#8b95a8;font-size:12px}.shuffle,.scroll-hint,.arrows{display:flex;align-items:center;gap:8px}.shuffle{font-size:12px;color:#7786a0;padding:8px;border-radius:10px}.arrows{gap:8px}.arrows button{border:1px solid #e5eaf4;display:grid;place-items:center;width:32px;height:32px;border-radius:50%}.mobile-nav{display:none}.folder-tabs{display:flex;gap:10px;margin:0 8px 12px}.folder-tabs button{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;color:var(--folder);padding:12px;border-radius:12px}.folder-tabs button[aria-pressed=true]{background:color-mix(in srgb,var(--folder) 12%,white)}.folder-tabs small{color:#758198}.empty{text-align:center;padding:80px 28px}.empty>span{font-size:55px;color:#7596e7}.empty h2{font:35px Libre Caslon Display,Georgia,serif}.empty p{color:#7b859a;line-height:1.7}.primary{display:flex;align-items:center;justify-content:center;gap:10px;background:#26334c;color:#fff;border-radius:16px;padding:17px 24px;width:100%;font-size:14px;margin-top:28px}.primary:hover:not(:disabled){background:#344967}dialog{padding:0;border:0;border-radius:28px;max-width:490px;width:calc(100% - 32px);max-height:90dvh;box-shadow:0 30px 100px #18264722;color:#26334c}dialog::backdrop{background:#1b2c4d50;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.sheet{padding:38px 32px;position:relative}.close{position:absolute;right:18px;top:18px;background:#f4f6fa;box-shadow:none}.sheet h2{font:38px Libre Caslon Display,Georgia,serif;line-height:1.1;margin:18px 0}.sheet h3{font-size:14px;margin-top:26px}.sheet-subtitle{color:#7c879a;font-size:14px;line-height:1.6}.definition-list>div{padding:4px 0 10px;border-bottom:1px solid #edf0f6}.definition-list h3{margin-top:20px}.definition-list p{font-size:16px;line-height:1.7;color:#67748c}.topic-options{display:flex;gap:8px;flex-wrap:wrap}.topic-options button{display:flex;align-items:center;gap:9px;background:#f5f7fb;border-radius:13px;padding:12px;font-size:13px}.topic-options span{font-family:Georgia,serif;font-size:19px;min-width:17px}.topic-options button[aria-pressed=true],.difficulty-options button[aria-pressed=true]{background:#e7eeff;color:#315ed0;box-shadow:inset 0 0 0 1px #acc2fb}.difficulty-options{display:flex;gap:8px}.difficulty-options button{flex:1;border-radius:12px;background:#f4f6fa;padding:13px 5px;font-size:14px}.range-labels{display:flex;justify-content:space-between;font-size:11px;color:#919aab;margin-top:10px}.privacy{font-size:12px;line-height:1.8;color:#8a94a6;text-align:center;margin-top:25px}.google b{font-size:20px}.toast{position:fixed;bottom:100px;left:50%;transform:translate(-50%);background:#26334c;color:#fff;box-shadow:0 6px 28px #1b2b4433;padding:13px 22px;border-radius:15px;font-size:14px;max-width:90vw;z-index:10}.handle{display:none}@media(min-height:900px){main{max-height:790px}}@media(max-width:1000px){.app{padding:0 28px;gap:35px;grid-template-columns:1fr 470px}.sidebar h1{font-size:39px}.sidebar{padding-top:95px}.topnote{display:none}}@media(max-width:760px){.app{padding:0 16px;display:flex;flex-direction:column;gap:0;max-width:530px}header{height:76px;flex-shrink:0;justify-content:space-between;padding:0 8px}.wordmark{font-size:27px}.wordmark img{width:27px;height:27px}.sidebar{display:none}main{flex:1;min-height:0;padding:0}.feed-toolbar{min-height:48px;padding:0 8px 8px;font-size:12px}.filter{font-size:12px;padding:9px 12px}.page{padding:6px 2px 0}article{padding:24px;border-radius:26px;min-height:300px}.question h2{font-size:39px}.question{padding:27px 0}.topic{font-size:12px}.topic-symbol{width:33px;height:33px}.under-card{height:76px;padding:0 10px}.save-folders{gap:10px}.under-card>span{font-size:11px}.feed-bottom{padding:0 5px 6px}.scroll-hint{font-size:11px}.arrows{display:none}.mobile-nav{display:flex;height:65px;flex-shrink:0;align-items:center;justify-content:space-around;background:#ffffffb8;border-radius:24px 24px 0 0;padding-bottom:env(safe-area-inset-bottom)}.mobile-nav button{display:grid;place-items:center;width:64px;height:45px;color:#939db0;border-radius:15px}.mobile-nav button.active{color:#3265e8;background:#eef3ff}dialog{margin:auto 0 0;width:100%;max-width:none;border-radius:26px 26px 0 0;max-height:90dvh}.sheet{max-width:520px;margin:auto;padding:30px 26px}.handle{display:block;width:34px;height:4px;background:#dce1eb;border-radius:3px;margin:-17px auto 27px}.sheet h2{font-size:35px}.close{top:22px}.folder-tabs{margin-bottom:3px}.toast{bottom:80px}}@media(max-height:700px){header{height:61px}.question h2{font-size:32px}article{min-height:270px}.question{padding:20px 0}.question-title{margin-bottom:12px}.under-card{height:62px}.mobile-nav{height:55px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}article{overflow-y:auto;scrollbar-width:thin}.card-top,.card-bottom,.question{flex-shrink:0}.topic{min-width:0}.level{flex-shrink:0}.definition-list p{overflow-wrap:anywhere}@media(max-width:760px){.long-question .question h2{font-size:33px}}@media(max-width:760px)and (max-height:700px){article{padding:18px}.question{padding:12px 0}.long-question .question h2{font-size:25px;line-height:1.14}.question-title{font-size:12px;margin-bottom:12px}.card-top{gap:4px}.topic{font-size:11px;gap:7px}.level{padding:4px}.level>span{margin-left:2px}.topic-symbol{width:29px;height:29px}.question h2{font-size:29px}}@media(max-width:350px){.save-folders{gap:4px}.under-card{padding:0 3px}.topic{font-size:11px}.level{gap:2px;padding:3px}.question h2{font-size:31px}.long-question .question h2{font-size:25px}}html,body,#root{height:100%;overflow:hidden;overscroll-behavior-y:none}.app{height:100dvh}.feed{overscroll-behavior-y:none;touch-action:pan-y;position:relative}.page{height:auto;min-height:100%;padding-bottom:4px}article{overflow:visible;min-height:0;flex:1}.question{flex-shrink:0}.question h2{white-space:pre-wrap;overflow-wrap:anywhere}.feedback-button{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;color:#77839b}.sheet select,.sheet textarea{display:block;width:100%;font:inherit;font-size:16px;border:1px solid #d7dfea;border-radius:12px;padding:12px;background:#fff;color:#26334c;margin:8px 0 20px}.sheet textarea{resize:vertical}.sheet label{display:block;font-size:14px;font-weight:600}.feedback-question{font-size:15px;line-height:1.6;padding:16px;background:#f4f6fb;border-radius:12px;white-space:pre-wrap}.text-button{display:block;color:#3265e8;font-size:14px;padding:14px 8px;margin:14px auto 0}.feedback-list{display:grid;gap:14px;margin-top:25px}.feedback-list>button{text-align:start;padding:15px;background:#f4f6fb;border-radius:12px}.feedback-list p{font-size:14px;line-height:1.5;white-space:pre-wrap}.feedback-list small{color:#778198;font-size:11px}.term{display:inline;padding:0;color:#3265ba;font:inherit;text-decoration:underline;text-decoration-color:#c1d0ec;text-underline-offset:4px;border-radius:3px}.term:hover{background:#edf3ff}.sheet [role=alert]{color:#a13232;font-size:14px}.sheet .primary{margin-top:20px}dialog{overscroll-behavior:contain}.card-bottom{margin-top:auto}.under-card{min-height:76px}.question{padding:22px 0}@media(max-width:760px){.page{min-height:100%}.question h2{font-size:clamp(1.5rem,6.7vw,2.3rem)}.long-question .question h2{font-size:clamp(1.35rem,6vw,2rem)}.question{padding:20px 0}.sheet{padding-bottom:calc(28px + env(safe-area-inset-bottom))}header{padding-top:env(safe-area-inset-top)}.under-card{min-height:66px}}