@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@400;500;600;700&display=swap');
:root{--icon-stroke:1.8}.icon{width:1em;height:1em;display:inline-block;flex:none;fill:none;stroke:currentColor;stroke-width:var(--icon-stroke);stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}
:root{--ink:#17191b;--muted:#73787d;--green:#1fbd55;--green-bright:#39df71;--dark:#0d1117;--line:#e3e6e8;--paper:#f7f8f7;--mono:'DM Mono',monospace;--sans:'Manrope',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.topbar{height:72px;background:#0d1117;color:#fff;display:flex;align-items:center;padding:0 max(calc((100% - 1160px)/2),6.1%);border-bottom:1px solid rgba(255,255,255,.1);gap:54px}.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}.brand-mark{width:31px;height:31px;border-radius:50%;background:white;color:#0d1117;display:grid;place-items:center}.brand-mark svg{width:25px;height:25px;fill:currentColor}.brand-name{font-size:16px;font-weight:700;letter-spacing:-.5px}.brand-name span{font-weight:400;color:#b5b8ba;margin-left:4px}.main-nav{height:100%;display:flex;align-items:center;gap:32px;font-size:13px;color:#b9bdc1;flex:1}.main-nav a{height:100%;display:flex;align-items:center;position:relative}.main-nav a:hover,.main-nav .nav-active{color:#fff}.main-nav .nav-active:after{content:'';position:absolute;bottom:0;height:2px;background:var(--green-bright);left:0;right:0}.github-link{font-family:var(--mono);font-size:10px;letter-spacing:.03em;border:1px solid #41464d;padding:10px 13px;border-radius:6px;color:#e6e9ec;display:flex;align-items:center;gap:7px}.github-dot{font-size:15px;color:var(--green-bright)}.hero{position:relative;background:radial-gradient(ellipse at 76% 47%,#162c22 0%,#111b17 32%,#0d1117 65%);color:white;min-height:522px;overflow:hidden;padding:79px max(calc((100% - 1160px)/2),6.1%) 55px;display:grid;grid-template-columns:1fr 1fr;align-items:center}.hero:before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:48px 48px;mask-image:linear-gradient(to right,transparent,#000 70%)}.hero-copy{position:relative;z-index:1;max-width:490px;margin-top:-10px}.eyebrow{font:10px var(--mono);letter-spacing:.13em;color:#aaaeb0;display:flex;align-items:center;gap:9px}.pulse{width:7px;height:7px;border-radius:50%;background:var(--green-bright);box-shadow:0 0 12px #39df7180}.hero h1{font-size:clamp(48px,5.6vw,72px);line-height:.99;letter-spacing:-.067em;margin:22px 0 20px;font-weight:600}.hero h1 span{color:var(--green-bright)}.hero-text{font-size:16px;line-height:1.65;color:#b6bdba;max-width:437px;margin:0 0 26px}.button{height:46px;border-radius:6px;padding:0 18px;display:inline-flex;align-items:center;gap:23px;font-weight:600;font-size:13px;transition:transform .18s,background .18s}.button:hover{transform:translateY(-2px)}.button-green{background:#2fdb67;color:#07110a;box-shadow:0 7px 24px #21c95528}.button-green:hover{background:#55ec83}.hero-meta{margin-top:25px;color:#939a97;font:10px var(--mono);display:flex;align-items:center;gap:10px}.check{color:var(--green-bright);font-size:14px}.meta-divider{color:#5d6460}.hero-art{height:360px;position:relative;z-index:1;display:flex;align-items:center;justify-content:center}.orbit{position:absolute;border:1px solid rgba(106,224,144,.12);border-radius:50%;transform:rotate(-25deg)}.orbit-one{width:450px;height:260px}.orbit-two{width:510px;height:330px}.paper-stack{position:absolute;width:260px;height:328px;border:1px solid #313a35;border-radius:7px;background:#17221c;transform:rotate(8deg) translate(18px,1px);box-shadow:0 20px 45px #0007}.stack-mid{background:#e7ebe5;transform:rotate(4deg) translate(10px,0);border-color:#c9d2ca}.exam-sheet{position:relative;width:258px;height:326px;background:#fcfdfb;border-radius:4px;padding:22px 21px;color:#191d1b;box-shadow:0 20px 70px #0009;transform:rotate(-3deg)}.sheet-top,.sheet-footer{display:flex;justify-content:space-between;font:8px var(--mono);color:#545b56;letter-spacing:.07em}.sheet-rule{height:2px;background:#1fbd55;margin:9px 0 23px}.sheet-title{font-size:18px;letter-spacing:-.04em;font-weight:700}.sheet-subtitle{font:10px var(--mono);color:#65706a;margin-top:5px}.sheet-lines{display:flex;flex-direction:column;gap:8px;margin:22px 0}.sheet-lines i{height:1px;background:#d9dedb;width:100%}.sheet-lines .short{width:62%}.sheet-equation{font:17px var(--mono);background:#f1f5f1;padding:12px 10px;color:#17672e}.sheet-footer{position:absolute;left:21px;right:21px;bottom:19px;border-top:1px solid #e0e4e1;padding-top:9px;font-size:7px}.floating-chip{position:absolute;background:#fff;color:#171a18;border:1px solid #e8ede9;border-radius:7px;box-shadow:0 10px 35px #0005;display:flex;gap:10px;align-items:center;padding:10px 13px;z-index:2}.floating-chip b,.floating-chip small{display:block}.floating-chip b{font-size:10px}.floating-chip small{font:8px var(--mono);color:#757e78;margin-top:3px}.chip-year{right:calc(50% - 200px);top:22px}.chip-free{left:calc(50% - 220px);bottom:28px}.chip-icon{background:#ebf9ef;color:#12953b;border-radius:5px;width:27px;height:27px;display:grid;place-items:center;font-size:14px}.free-icon{width:26px;height:26px;background:#2adb64;border-radius:50%;display:grid;place-items:center;font-size:14px;color:#092110}.sparkle{position:absolute;color:var(--green-bright);font-size:18px}.sparkle-a{right:18%;top:70px}.sparkle-b{left:18%;bottom:61px;font-size:13px}.hero-bottom-label{position:absolute;left:max(calc((100% - 1160px)/2),6.1%);bottom:22px;display:flex;align-items:center;gap:12px;color:#65706a;font:9px var(--mono);letter-spacing:.1em}.hero-bottom-label>span:first-child{color:var(--green-bright)}.hero-bottom-label .line{width:100px;height:1px;background:#35403a}.library-section{max-width:1040px;margin:0 auto;padding:83px 0 68px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:33px}.dark-eyebrow{color:#747a76}.green-square{width:7px;height:7px;background:var(--green);display:inline-block}.section-heading h2,.mission-section h2,.contribute-section h2{font-size:38px;line-height:1.13;letter-spacing:-.055em;margin:14px 0 9px;font-weight:600}.section-heading p{font-size:14px;color:#737a76;margin:0}.library-count{display:flex;align-items:center;gap:11px;padding:12px 15px;background:#f4f6f4;border:1px solid #e8ebe8;border-radius:7px;margin-bottom:4px}.count-icon{width:32px;height:32px;border-radius:5px;background:#e3f8e9;color:#1aa346;display:grid;place-items:center;font-size:17px}.library-count b,.library-count small{display:block}.library-count b{font:16px var(--mono)}.library-count small{font-size:10px;color:#767d79;margin-top:2px}.search-bar{height:53px;border:1px solid #d8ddda;border-radius:7px;display:flex;align-items:center;padding:0 12px 0 17px;box-shadow:0 2px 5px #10182008}.search-bar:focus-within{border-color:#37bd61;box-shadow:0 0 0 3px #39df711f}.search-icon{font-size:17px;color:#777e79;line-height:1;margin-right:12px;display:flex}.search-bar input{font:13px var(--sans);border:0;outline:0;flex:1;color:var(--ink);background:transparent}.search-bar input::placeholder{color:#929894}.search-bar kbd{font:10px var(--mono);color:#8d938f;background:#f4f5f4;border:1px solid #e2e5e2;border-radius:4px;padding:3px 7px}.search-bar button{border:0;background:transparent;font-size:16px;color:#848b86;cursor:pointer;margin-left:8px;display:none;padding:2px}.search-bar button.visible{display:block}.filters-row{display:flex;justify-content:space-between;align-items:center;margin-top:21px;padding-bottom:14px;border-bottom:1px solid #e5e8e6}.filter-tabs{display:flex;gap:5px}.filter{border:0;background:transparent;border-radius:5px;padding:9px 11px;font:12px var(--sans);color:#69716c;cursor:pointer}.filter span{font:10px var(--mono);color:#929a94;margin-left:7px}.filter.active{background:#edf8f0;color:#127333;font-weight:600}.filter.active span{color:#238d45}.sort-control{font-size:11px;color:#7a827d;display:flex;align-items:center;gap:5px;position:relative}.sort-control select{appearance:none;border:0;background:transparent;padding:6px 16px 6px 2px;font:11px var(--sans);color:#313632;cursor:pointer;outline:0}.sort-control>span{position:absolute;right:1px;pointer-events:none;color:#69716c}.active-filters{display:flex;justify-content:space-between;padding:18px 2px 11px;font-size:11px;color:#7a817c}.active-filters b{font-weight:500;color:#414843}.filter-note{display:flex;align-items:center;gap:7px;font:9px var(--mono);text-transform:uppercase;letter-spacing:.04em;color:#838a85}.paper-list{border-top:1px solid #e5e8e6}.paper-row{min-height:87px;border-bottom:1px solid #e5e8e6;display:grid;grid-template-columns:48px 1fr 100px 135px 106px;align-items:center;gap:16px;padding:15px 8px;transition:background .15s}.paper-row:hover{background:#fafcfb}.paper-icon{width:40px;height:48px;border-radius:4px;background:#f0f6f1;border:1px solid #e1eae3;display:grid;place-items:center;color:#268146;font-size:19px;position:relative}.paper-icon:after{content:'PDF';position:absolute;bottom:4px;font:7px var(--mono);color:#448459;letter-spacing:.06em}.paper-icon .icon{font-size:18px;margin-top:-7px}.paper-name{font-size:14px;font-weight:600;letter-spacing:-.02em;margin:0 0 6px}.paper-subtitle{font-size:11px;color:#777f79;margin:0}.paper-exam{display:inline-flex;align-items:center;padding:5px 7px;border-radius:4px;background:#f0f2f0;color:#515853;font:9px var(--mono);letter-spacing:.04em;width:max-content}.paper-year{font:11px var(--mono);color:#606762}.paper-actions{display:flex;justify-content:flex-end;gap:7px}.action-btn{height:32px;padding:0 10px;border:1px solid #dce1de;border-radius:5px;background:#fff;font:10px var(--sans);color:#3f4641;display:inline-flex;gap:6px;align-items:center;cursor:pointer}.action-btn:hover{border-color:#8bc99b;color:#13672d;background:#f8fcf9}.action-btn .icon{font-size:13px}.action-btn.download{background:#f4f6f4}.empty-state{text-align:center;padding:50px 0 40px;color:#747d77}.empty-icon{font-size:29px}.empty-state h3{font-size:17px;color:#282d29;margin:8px 0}.empty-state p{font-size:13px}.text-button,.inline-link{border:0;background:none;color:#137b35;font:600 12px var(--sans);cursor:pointer}.text-button .icon,.inline-link .icon,.library-footer .icon{font-size:13px;margin-left:5px}.button .icon{font-size:14px}.hero .button .icon{font-size:14px}.library-footer{display:flex;justify-content:space-between;border-top:1px solid #e5e8e6;padding:20px 7px 0;font-size:11px;color:#7c837e}.library-footer a{color:#197b38;font-weight:600}.mission-section{background:#0d1117;color:#fff;padding:78px max(calc((100% - 1040px)/2),6.1%) 76px;position:relative;overflow:hidden}.mission-section:after{content:'';position:absolute;width:420px;height:420px;border:1px solid #1d3a26;border-radius:50%;right:-170px;top:-200px;box-shadow:0 0 0 35px #101c14,0 0 0 36px #1a3322,0 0 0 70px #101c14,0 0 0 71px #1a3322;opacity:.55}.mission-grid{display:grid;grid-template-columns:1fr .72fr;gap:65px;align-items:end;position:relative;z-index:1}.mission-section h2{font-size:42px;margin:17px 0 0}.mission-section h2 em{font-style:normal;color:#47dd77}.mission-copy p{color:#a9b0ab;font-size:14px;line-height:1.7;margin:0 0 19px}.inline-link{padding:0;color:#63e68b}.inline-link span{margin-left:7px}.values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:55px;position:relative;z-index:1}.value-card{border:1px solid #27302b;background:#121a15;padding:22px;border-radius:7px;min-height:151px}.value-icon{height:31px;width:31px;border-radius:6px;display:grid;place-items:center;font-size:16px}.green-icon{background:#143a21;color:#50e87e}.violet-icon{background:#28203b;color:#ba94ff}.amber-icon{background:#3a3020;color:#f2bc5c}.value-card h3{font-size:13px;margin:18px 0 7px}.value-card p{font-size:11px;line-height:1.55;color:#979f99;margin:0;max-width:240px}.contribute-section{max-width:1040px;margin:0 auto;padding:53px 0;display:grid;grid-template-columns:55px 1fr auto;gap:19px;align-items:center;border-bottom:1px solid var(--line)}.contribute-mark{width:46px;height:46px;border-radius:8px;background:#e6f9eb;color:#1bab45;display:grid;place-items:center;font-size:21px}.contribute-section h2{font-size:24px;margin:10px 0 5px}.contribute-section p{font-size:12px;color:#717a74;margin:0;max-width:550px;line-height:1.55}.button-outline{border:1px solid #cfd6d1;color:#2d342f;background:white;gap:17px}.button-outline:hover{background:#f1faf3;border-color:#84c994}.footer{max-width:1040px;margin:0 auto;min-height:93px;display:flex;align-items:center;gap:28px}.footer-brand .brand-mark{background:#0d1117;color:#fff;width:28px;height:28px}.footer-brand .brand-mark svg{width:23px}.footer-brand .brand-name{font-size:13px}.footer-brand .brand-name span{color:#6f7771}.footer-note{font-size:10px;color:#838a85;flex:1}.footer-note span{margin:0 5px;color:#c0c5c1}.back-top{font:10px var(--mono);color:#636b65}.paper-dialog{border:0;border-radius:9px;padding:30px;width:min(440px,calc(100% - 32px));box-shadow:0 20px 80px #0005;color:var(--ink)}.paper-dialog::backdrop{background:#08110bc2;backdrop-filter:blur(3px)}.dialog-close{position:absolute;right:15px;top:12px;border:0;background:none;font-size:19px;color:#737a76;cursor:pointer;padding:3px}.dialog-eyebrow{font:9px var(--mono);letter-spacing:.12em;color:#6d756f;display:flex;align-items:center;gap:8px}.paper-dialog h3{font-size:24px;letter-spacing:-.04em;margin:22px 0 7px}.dialog-sub{font-size:13px;color:#747d77;margin:0 0 22px}.dialog-meta{display:grid;grid-template-columns:1fr 1fr;gap:10px}.dialog-meta div{background:#f5f7f5;padding:12px;border-radius:5px}.dialog-meta small,.dialog-meta strong{display:block}.dialog-meta small{font:9px var(--mono);color:#808983;text-transform:uppercase}.dialog-meta strong{font-size:12px;margin-top:5px}.demo-note{font-size:11px;line-height:1.55;color:#69716c;background:#f3f8f4;border-left:2px solid var(--green);padding:11px 13px;margin-top:17px}
@media(max-width:1100px){.library-section,.contribute-section,.footer{margin-left:6.1%;margin-right:6.1%}.hero-art{transform:scale(.9)}.topbar{gap:32px}}
@media(max-width:760px){.topbar{height:62px;padding:0 5%;gap:20px}.brand-mark{width:28px;height:28px}.brand-name{font-size:14px}.main-nav{gap:16px;font-size:11px}.github-link{font-size:0;padding:8px 10px}.github-link .github-dot{font-size:15px}.github-link span:last-child{font-size:12px}.hero{padding:62px 7% 72px;grid-template-columns:1fr;min-height:auto}.hero-copy{max-width:530px;margin:0}.hero h1{font-size:58px}.hero-art{height:300px;margin-top:10px;transform:scale(.83)}.hero-bottom-label{left:7%;bottom:23px}.library-section{padding:61px 0 52px;margin:0 6%}.section-heading h2{font-size:33px}.library-count{padding:9px 11px}.paper-row{grid-template-columns:42px 1fr auto;gap:10px;padding:14px 3px}.paper-exam{display:none}.paper-year{grid-column:2;grid-row:2;font-size:10px;margin-top:-5px}.paper-info{grid-column:2;grid-row:1}.paper-actions{grid-column:3;grid-row:1 / span 2}.action-btn{width:34px;padding:0;justify-content:center;font-size:0}.action-btn .action-symbol{font-size:14px}.paper-icon{width:36px;height:43px;grid-row:1 / span 2}.filters-row{align-items:flex-start}.filter-tabs{gap:0}.filter{padding:8px 7px;font-size:11px}.filter span{margin-left:3px}.sort-control{font-size:0;gap:0}.sort-control select{font-size:10px}.sort-control>span{right:0}.mission-section{padding:61px 7%}.mission-grid{grid-template-columns:1fr;gap:23px}.mission-section h2{font-size:36px}.mission-copy{max-width:560px}.values-grid{margin-top:37px;gap:9px}.value-card{padding:15px;min-height:156px}.value-card p{font-size:10px}.contribute-section{margin:0 6%;grid-template-columns:45px 1fr;gap:12px;padding:38px 0}.contribute-mark{width:40px;height:40px}.contribute-section h2{font-size:21px}.contribute-section p{font-size:11px}.contribute-section .button{grid-column:2;justify-self:start;margin-top:5px}.footer{margin:0 6%;gap:14px;min-height:80px}.footer-note{font-size:9px}.back-top{display:none}}
@media(max-width:480px){.topbar{gap:15px}.brand{gap:7px}.brand-name{font-size:13px}.main-nav{gap:12px;font-size:10px}.main-nav a:nth-child(2){display:none}.hero{padding-top:52px}.hero h1{font-size:50px}.hero-text{font-size:14px}.hero-meta{font-size:8px;gap:7px}.hero-art{margin:0 -15%;transform:scale(.7);height:255px}.hero-bottom-label{font-size:8px}.section-heading{align-items:flex-start;gap:8px}.section-heading h2{font-size:29px}.section-heading p{font-size:12px;max-width:235px;line-height:1.5}.library-count{padding:8px;margin-top:5px;gap:7px}.count-icon{width:26px;height:26px}.library-count b{font-size:13px}.library-count small{font-size:8px}.search-bar{height:48px;padding-left:12px}.search-bar input{font-size:11px}.search-bar kbd{display:none}.filter{font-size:10px;padding:8px 5px}.filter span{font-size:9px}.active-filters{font-size:10px}.filter-note{font-size:8px}.paper-name{font-size:12px}.paper-subtitle{font-size:10px}.paper-row{grid-template-columns:35px 1fr auto;gap:8px}.action-btn{width:30px;height:30px}.paper-icon{width:32px;height:40px;font-size:16px}.library-footer{font-size:9px;gap:12px;line-height:1.45}.library-footer a{text-align:right}.values-grid{grid-template-columns:1fr;gap:8px}.value-card{min-height:0;display:grid;grid-template-columns:34px 1fr;column-gap:10px;padding:13px}.value-icon{grid-row:1 / span 2;width:29px;height:29px}.value-card h3{margin:1px 0 5px}.value-card p{max-width:none}.mission-section h2{font-size:33px}.footer-note{max-width:170px;line-height:1.5}.footer-note span{margin:0 2px}.hero-art{margin-left:-23%;margin-right:-23%}}

.brand-mark img{width:21px;height:auto;display:block}
.footer-brand .brand-mark img{width:19px;filter:invert(1)}