:root{--bg:#f8f8f3;--surface:#fff;--ink:#18211c;--muted:#69716b;--line:#e4e7df;--lime:#d9fa75;--lime-soft:#f0facd;--green:#e6f3dd;--purple:#eae4fa;--yellow:#fff1c9;--blue:#e1eef8;--shadow:0 12px 40px #18211c09;--radius:23px;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
:root[data-theme=dark]{--bg:#141915;--surface:#1e2520;--ink:#f3f5ed;--muted:#a7b3aa;--line:#354138;--lime-soft:#303f21;--green:#263829;--purple:#332d42;--yellow:#403a24;--blue:#263944;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{color:inherit;cursor:pointer}a{color:inherit}button{border:0;background:none}button:disabled{cursor:wait;opacity:.6}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #768e30;outline-offset:4px}button:active{transform:scale(.98)}h1,h2,h3,p{margin:0}h1{font-size:43px;line-height:1.04;letter-spacing:-2px;font-weight:730}h2{font-size:22px;line-height:1.2;letter-spacing:-.7px}h3{font-size:17px;line-height:1.3;letter-spacing:-.25px}p{line-height:1.6}small{font-size:12px}svg{flex-shrink:0}.icon{vertical-align:middle}.muted{color:var(--muted)}.brand{font-size:26px;letter-spacing:-1.5px;font-weight:800;text-decoration:none;white-space:nowrap}.brand span{color:#a0c837}.skip{position:fixed;top:-100px;left:10px;z-index:1000;padding:15px;background:var(--lime);color:#18211c}.skip:focus{top:10px}
.shell{max-width:1260px;margin:auto;display:grid;grid-template-columns:200px minmax(0,610px) 270px;gap:48px;padding:0 32px}.sidebar{height:100dvh;position:sticky;top:0;padding:43px 0;display:flex;flex-direction:column}.sidebar .brand{margin:0 0 57px 12px}.nav-items{display:flex;flex-direction:column;gap:10px}.nav-item{display:flex;align-items:center;gap:15px;padding:15px 18px;border-radius:14px;color:var(--muted);font-size:15px;font-weight:550;text-align:left;min-height:48px}.nav-item.active{background:var(--lime);color:#18211c}.sidebar .side-bottom{margin-top:auto}.side-note{font-size:13px;color:var(--muted);padding:18px 13px;line-height:1.5}.side-note strong{color:var(--ink);font-weight:600}.topbar{height:112px;display:flex;align-items:center;justify-content:space-between;gap:16px}.topbar .brand{display:none}.date{font-size:12px;color:var(--muted);letter-spacing:1.2px;text-transform:uppercase}.circle-btn{width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--surface);display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.top-actions{display:flex;gap:8px;align-items:center}.pill{display:inline-flex;align-items:center;gap:7px;font-size:12px;padding:8px 11px;border:1px solid var(--line);border-radius:30px;color:var(--muted)}
main{min-width:0;padding-bottom:60px}.greeting{margin:5px 0 27px}.greeting h1{max-width:490px;font-size:52px}.greeting p{color:var(--muted);font-size:15px;margin-top:14px}.search-form{display:flex;align-items:center;border:1px solid var(--line);border-radius:100px;padding:6px 7px 6px 18px;gap:12px;background:var(--surface);box-shadow:0 2px 5px #00000002;min-height:58px}.search-form>.icon{width:20px;color:var(--muted)}.search-form input{min-width:0;flex:1;border:0;background:transparent;outline:none!important;color:var(--ink);font-size:16px;line-height:1.4;padding:6px 0}.search-form input::placeholder{color:#8b928b;font-size:14px}.search-form button{border-radius:50%;background:var(--bg);width:42px;height:42px;display:grid;place-items:center}.search-form:focus-within{border-color:#8fae49;box-shadow:0 0 0 3px #d9fa7533}.topics{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;margin:23px -2px 20px;padding:2px;white-space:nowrap}.topics::-webkit-scrollbar{display:none}.chip{padding:11px 17px;border-radius:30px;border:1px solid var(--line);font-size:13px;min-height:44px;white-space:nowrap}.chip.active{background:var(--lime);color:#18211c;border-color:var(--lime);font-weight:600}
.feature{background:var(--lime-soft);border:1px solid #cde777;position:relative;border-radius:var(--radius);padding:28px;overflow:hidden;min-height:270px;text-align:left;width:100%;display:block;color:var(--ink)}.feature .eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;margin-bottom:16px}.feature h2{font-size:33px;letter-spacing:-1.2px;max-width:78%;position:relative;z-index:1;line-height:1.06}.feature p{max-width:65%;font-size:14px;margin-top:14px;line-height:1.5;position:relative;z-index:1}.feature-footer{display:flex;align-items:center;justify-content:space-between;margin-top:25px;position:relative;z-index:1}.meta{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:12px}.meta .icon{width:15px;height:15px}.dark-round{display:grid;place-items:center;width:43px;height:43px;background:#18211c;color:#fff;border-radius:50%}.orbit{position:absolute;width:205px;height:205px;right:-45px;top:65px;border:1px solid #859b57;border-radius:50%;transform:rotate(-25deg);opacity:.8}.orbit:before,.orbit:after{content:'';position:absolute;inset:24px;border:1px solid #859b57;border-radius:50%}.orbit:after{inset:49px}.planet{width:55px;height:55px;border-radius:50%;background:#b9df4b;position:absolute;top:74px;left:74px;box-shadow:73px -52px 0 -22px #203528,-80px 12px 0 -21px #203528,24px 78px 0 -20px #203528}
.section-heading{display:flex;gap:10px;align-items:center;justify-content:space-between;margin:29px 0 12px}.section-heading h2{font-size:20px}.text-btn{font-size:12px;display:flex;gap:7px;align-items:center;border:1px solid var(--line);border-radius:99px;min-height:40px;padding:8px 12px;white-space:nowrap}.text-btn .icon{width:16px;height:16px}.article-row{display:flex;align-items:center;gap:15px;padding:18px 0;width:100%;text-align:left;border-bottom:1px solid var(--line);min-height:100px}.article-row .thumb{width:66px;height:70px;display:grid;place-items:center;border-radius:17px;flex-shrink:0}.thumb .icon{width:30px;height:30px}.article-row .row-copy{flex:1;min-width:0}.article-row h3{font-size:15px;line-height:1.35}.article-row p{font-size:12px;line-height:1.45;color:var(--muted);margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.article-row .meta{margin-top:6px;font-size:10px}.article-row>.icon{width:17px;color:var(--muted)}.green{background:var(--green)}.purple{background:var(--purple)}.yellow{background:var(--yellow)}.blue{background:var(--blue)}.lime{background:var(--lime-soft)}.bottom-nav{display:none}.wide-btn{border:1px solid var(--line);border-radius:14px;width:100%;padding:15px;font-size:14px;font-weight:600;min-height:48px}.wide-btn.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}.more{margin-top:18px}.footnote{font-size:12px;line-height:1.6;color:var(--muted);margin-top:20px}
.rightbar{padding-top:118px}.side-panel{border:1px solid var(--line);border-radius:22px;padding:22px;margin-bottom:22px}.side-panel h2{font-size:18px;margin:12px 0}.side-panel p{font-size:13px;color:var(--muted);line-height:1.6}.side-panel .wide-btn{margin-top:18px}.side-panel .icon-heading{width:42px;height:42px;background:var(--lime-soft);display:grid;place-items:center;border-radius:13px}.progress-track{height:5px;background:var(--line);border-radius:10px;overflow:hidden;margin:16px 0 10px}.progress-track>span{height:100%;display:block;background:#a7c853;transition:width .4s}.side-question{display:block;width:100%;text-align:left;font-size:13px;padding:13px 0;border-bottom:1px solid var(--line);line-height:1.5}.side-question:last-child{border-bottom:0}.side-label{text-transform:uppercase;letter-spacing:1.5px;color:var(--muted);font-size:10px}
.collection{display:flex;align-items:center;gap:20px;border-radius:20px;padding:23px 20px;margin-bottom:12px;width:100%;text-align:left;min-height:112px}.collection>.icon{width:40px;height:40px}.collection .collection-copy{flex:1}.collection h3{font-size:17px}.collection p{font-size:13px;color:var(--muted);margin-top:6px;line-height:1.5}.collection .chev{width:18px}.page-title{margin-bottom:27px}.page-title h1{font-size:42px;letter-spacing:-1.6px;line-height:1.08}.page-title p{font-size:16px;color:var(--muted);margin-top:12px}.page-title .back-inline{display:flex;align-items:center;gap:7px;padding:0;margin-bottom:24px;font-size:13px;min-height:44px}.explore-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.topic-tile{border:1px solid var(--line);border-radius:18px;padding:20px;text-align:left;min-height:110px}.topic-tile span{display:block;margin-top:16px;font-size:15px;font-weight:600}.count{font-size:13px;color:var(--muted);margin:8px 0 20px}.stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:18px;padding:20px 10px;margin-bottom:24px;text-align:center}.stats strong{display:block;font-size:26px;font-weight:650;letter-spacing:-1px}.stats span{font-size:11px;color:var(--muted)}.empty{text-align:center;padding:45px 20px;border:1px dashed var(--line);border-radius:22px}.empty>.icon{width:42px;height:42px;color:var(--muted);margin-bottom:20px}.empty h2{font-size:22px;margin-bottom:12px}.empty p{font-size:14px;color:var(--muted);margin-bottom:24px}
.reader-top{display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:5;padding:24px 0 18px;background:var(--bg);gap:12px}.reader-top .category{flex:1;color:var(--muted);font-size:13px}.reader-title{font-size:40px;letter-spacing:-1.6px;line-height:1.08;margin:16px 0}.reader-meta{display:flex;gap:14px;align-items:center;margin-bottom:26px;color:var(--muted);font-size:11px;flex-wrap:wrap}.reader-meta .icon{width:14px;height:14px}.summary{background:var(--lime-soft);border:1px solid #cde777;border-radius:18px;padding:22px;margin-bottom:14px}.summary h2{font-size:17px;margin-bottom:9px;letter-spacing:-.3px}.summary p{font-size:16px;line-height:1.65}.segmented{display:flex;border-radius:30px;background:var(--line);padding:4px;margin:18px 0 26px;gap:4px}.segmented button{flex:1;border-radius:24px;padding:11px;font-size:13px;min-height:43px}.segmented .active{background:var(--ink);color:var(--bg)}.step{display:flex;gap:17px;position:relative;padding-bottom:26px}.step:last-child{padding-bottom:10px}.step-number{height:30px;width:30px;display:grid;place-items:center;background:var(--lime);color:#18211c;border-radius:50%;font-size:13px;font-weight:650;flex-shrink:0;position:relative;z-index:1}.step:not(:last-child):before{content:'';position:absolute;left:14px;top:36px;bottom:5px;width:1px;background:var(--line)}.step h3{margin:3px 0 5px;font-size:16px}.step p{font-size:15px;color:var(--muted);line-height:1.65}.brief-list{padding:0 0 0 22px;color:var(--muted);font-size:15px;line-height:1.7}.brief-list li{padding:5px 0}.try-it{border-left:3px solid #b8d65d;padding:3px 0 3px 17px;margin:25px 0}.try-it h3{font-size:14px;margin-bottom:5px}.try-it p{color:var(--muted);font-size:14px}.quiz{border:1px solid var(--line);background:var(--surface);border-radius:19px;padding:20px;margin:25px 0}.quiz-title{display:flex;align-items:center;gap:9px;margin-bottom:12px;font-size:16px;font-weight:650}.quiz-title .icon{width:22px;height:22px}.quiz p{font-size:14px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}.quiz-options button{padding:13px 10px;border:1px solid var(--line);border-radius:12px;min-height:65px;font-size:12px;line-height:1.4}.quiz-options button.correct{background:var(--lime-soft);border-color:#98ba40}.quiz-options button.wrong{background:var(--yellow);border-color:#d9b66c}.quiz-feedback{margin-top:15px;font-size:13px;line-height:1.6;color:var(--muted)}.related{margin:28px 0}.related h2{font-size:19px;margin-bottom:10px}.related button{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);width:100%;text-align:left;font-size:14px;line-height:1.5;min-height:52px}.related button span{flex:1}.related button .icon{width:17px}.sources{border-top:1px solid var(--line);padding-top:20px;margin-top:25px}.sources h3{font-size:13px}.sources a{display:flex;align-items:center;gap:8px;margin-top:10px;color:var(--muted);font-size:12px;line-height:1.5;overflow-wrap:anywhere}.sources .icon{width:14px}.learned-btn{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:26px}.learned-btn.done{background:var(--lime-soft);color:var(--ink);border-color:#a3bc61}.notice{background:var(--yellow);border:1px solid #dfcb91;border-radius:14px;padding:15px 17px;font-size:13px;line-height:1.6;margin:18px 0}.error{border-color:#d1a594}.source-preview{border:1px solid var(--line);padding:22px;border-radius:18px;margin:16px 0}.source-preview h3{font-size:19px;margin-bottom:10px}.source-preview p{font-size:14px;color:var(--muted)}.source-preview a{display:inline-flex;align-items:center;gap:8px;margin-top:14px;font-size:12px}.source-preview .icon{width:14px}.loading{display:flex;align-items:center;gap:13px;padding:30px 0;color:var(--muted);font-size:14px}.spinner{width:20px;height:20px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--ink);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
dialog{border:1px solid var(--line);border-radius:24px;background:var(--bg);color:var(--ink);width:calc(100% - 32px);max-width:440px;padding:26px;max-height:85dvh;overflow:auto;box-shadow:0 25px 80px #0003}dialog::backdrop{background:#13201870;backdrop-filter:blur(5px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.dialog-top h2{font-size:25px}.setting{border-top:1px solid var(--line);padding:19px 0}.setting h3{font-size:15px;margin-bottom:8px}.setting p{font-size:12px;color:var(--muted);line-height:1.7}.setting select{margin-top:10px;width:100%;padding:12px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:12px}.setting ol{padding-left:20px;font-size:13px;line-height:1.8;color:var(--muted)}.setting .wide-btn{margin-top:12px}#toast{position:fixed;bottom:calc(100px + env(safe-area-inset-bottom));left:50%;transform:translate(-50%,15px);padding:13px 20px;border-radius:14px;background:var(--ink);color:var(--bg);font-size:13px;max-width:85vw;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;box-shadow:var(--shadow)}#toast.show{opacity:1;transform:translate(-50%,0)}.offline-banner{background:var(--yellow);font-size:12px;line-height:1.5;text-align:center;padding:10px 18px}.fade-in{animation:appear .25s ease-out}@keyframes appear{from{opacity:.2;transform:translateY(5px)}to{opacity:1;transform:none}}
@media(min-width:1250px){.greeting h1{font-size:57px}.feature{min-height:290px}.feature h2{font-size:37px}}
@media(max-width:1150px){.shell{grid-template-columns:170px minmax(0,610px);gap:36px;max-width:900px}.rightbar{display:none}}
@media(max-width:700px){.shell{display:block;padding:0 22px;max-width:480px}.sidebar{display:none}.topbar{height:auto;padding:calc(24px + env(safe-area-inset-top)) 0 26px}.topbar .brand{display:block}.topbar .date{display:none}.top-actions .pill{display:none}main{padding-bottom:calc(115px + env(safe-area-inset-bottom))}.greeting{margin:3px 0 25px}.greeting h1{font-size:43px;letter-spacing:-1.8px}.greeting p{font-size:14px;line-height:1.55;max-width:310px;margin-top:12px}.search-form{min-height:56px;padding-left:16px;gap:10px}.search-form input::placeholder{font-size:13px}.topics{margin:19px -22px 17px;padding:2px 22px;gap:8px}.chip{font-size:12px;padding:10px 15px}.feature{min-height:264px;padding:23px}.feature h2{font-size:29px;max-width:91%;letter-spacing:-1px}.feature p{font-size:13px;max-width:67%;margin-top:13px}.feature .eyebrow{font-size:9px;letter-spacing:1.4px;margin-bottom:15px}.feature .orbit{right:-67px;top:76px}.feature-footer{margin-top:24px}.section-heading{margin-top:27px;gap:5px}.section-heading h2{font-size:18px;letter-spacing:-.6px;max-width:62%}.text-btn{font-size:10px;padding:7px 9px;gap:5px}.text-btn .icon{width:14px}.article-row{gap:13px;padding:16px 0}.article-row .thumb{width:57px;height:64px;border-radius:16px}.article-row h3{font-size:14px}.article-row p{font-size:12px}.bottom-nav{position:fixed;z-index:15;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;padding:9px 15px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line);display:flex;justify-content:space-around;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.bottom-nav button{display:flex;align-items:center;flex-direction:column;gap:6px;font-size:10px;color:var(--muted);min-width:64px;min-height:49px;padding:4px 9px;border-radius:15px}.bottom-nav button.active{color:var(--ink);font-weight:650}.bottom-nav button.active .icon{fill:var(--ink);stroke:var(--bg)}.bottom-nav button.active[data-tab=explore] .icon,.bottom-nav button.active[data-tab=saved] .icon{fill:none;stroke:var(--ink);stroke-width:2.2}.bottom-nav .icon{width:23px;height:23px}.page-title h1{font-size:39px}.page-title p{font-size:16px}.collection{padding:22px 18px;gap:17px;min-height:116px}.collection h3{font-size:16px}.collection p{font-size:12px}.collection>.icon{width:36px;height:36px}.reader-top{padding-top:calc(16px + env(safe-area-inset-top));padding-bottom:15px}.reader-title{font-size:35px;margin-top:15px}.reader-meta{margin-bottom:22px;font-size:10px;gap:10px}.summary{padding:18px}.summary p{font-size:15px;line-height:1.6}.step p{font-size:14px}.reader-top .circle-btn{border:0;background:transparent}.reader-top .top-actions{gap:2px}.reader-top .category{margin-left:3px}.stats{margin-top:8px}.explore-grid{gap:10px}.topic-tile{padding:18px}.source-preview{padding:18px}dialog{margin:auto auto max(16px,env(safe-area-inset-bottom));border-radius:25px;max-height:90dvh}.footnote{font-size:11px}}
@media(max-width:360px){.shell{padding:0 17px}.greeting h1{font-size:39px}.feature h2{font-size:27px}.section-heading h2{font-size:16px}.collection{gap:12px;padding:18px 14px}.collection h3{font-size:15px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.bottom-nav .nav-item,.bottom-nav .nav-item.active{background:transparent}