:root{--ink:#172d25;--green:#194d38;--paper:#f6f6ee;--line:#d9dfd1;--muted:#637268;--lime:#e9f49b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;color:inherit;border:1px solid var(--line);border-radius:8px;background:white;padding:9px 16px}button:hover{border-color:var(--green);background:#eef2e6}button:disabled{cursor:wait;opacity:.5}a{color:inherit}label{display:block;font-size:13px;font-weight:600}input,select,textarea{display:block;width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink)}textarea{resize:vertical}.top{max-width:1200px;margin:auto;height:92px;display:flex;align-items:center;gap:30px;padding:0 30px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;text-decoration:none;font-size:23px;font-weight:800;letter-spacing:-1px}.brand>span:last-child{font-weight:400}.logo{margin-right:10px;background:var(--green);color:var(--lime);font: bold 31px Georgia;border-radius:9px;padding:0 12px 5px}.top-note{color:var(--muted);font-size:13px}.top button{margin-left:auto}main{max-width:1140px;margin:auto;padding:0 30px}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:70px;padding:65px 0 55px}.eyebrow,.tiny{font-size:11px;letter-spacing:1.6px;font-weight:700}.eyebrow{color:var(--muted);margin:0 0 15px}h1{font-size:clamp(38px,4.8vw,62px);line-height:1.13;letter-spacing:-2.8px;margin:0 0 24px}h1 em{font-family:Georgia,serif;font-style:normal;color:var(--green)}.intro{color:var(--muted);font-size:15px;margin-bottom:26px}.primary{display:inline-flex;align-items:center;gap:30px;background:var(--green);color:white;border:0;border-radius:7px;text-decoration:none;padding:12px 20px;font-weight:600;font-size:14px}.primary:hover{background:#286348;color:white}.thought{position:relative;background:var(--green);color:white;border-radius:14px;padding:28px 32px;overflow:hidden;min-height:285px}.thought .tiny{color:var(--lime)}.thought p{font-size:27px;line-height:1.5;letter-spacing:-.5px;margin:23px 0 36px}.thought strong{color:var(--lime)}.thought small{font-size:11px;opacity:.7}.dots{position:absolute;right:24px;bottom:62px;display:grid;grid-template-columns:repeat(3,10px);gap:10px;transform:rotate(-12deg)}.dots i{width:10px;height:10px;border-radius:50%;background:#80a57e}.dots i:nth-child(5){background:var(--lime)}.stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:10px;padding:23px 0;background:#fff8}.stats>div{padding:0 25px;border-right:1px solid var(--line);display:flex;flex-direction:column}.stats>div:last-child{border:0}.stats strong{font-size:27px;line-height:1.2}.stats span{font-size:12px;color:var(--muted);margin-top:6px}progress{width:100%;height:6px;margin-top:10px;accent-color:var(--green)}.notice{font-size:13px;min-height:24px;color:var(--green);margin:10px 0 0}.section-head{display:flex;justify-content:space-between;align-items:center;margin:35px 0 23px}.section-head h2{font-size:28px;letter-spacing:-1px;margin:0}.section-head .eyebrow{margin-bottom:5px}.section-head>p{font-size:13px;color:var(--muted)}.packs{display:flex;gap:10px;flex-wrap:wrap}.packs button{background:transparent;font-size:13px}.packs button.active{background:var(--green);color:white;border-color:var(--green)}.filters{display:grid;grid-template-columns:2fr 1fr 1fr;gap:15px;margin-top:25px}.muted{color:var(--muted);font-size:13px}.problem-list{border-top:1px solid var(--line)}.problem{display:grid;grid-template-columns:44px 1fr auto auto;align-items:center;gap:18px;padding:19px 0;border-bottom:1px solid var(--line)}.number{font-size:12px;color:var(--muted);font-family:monospace}.problem h3{font-size:16px;margin:0 0 3px;font-weight:600}.problem small{color:var(--muted);font-size:11px}.problem .open{border:0;background:transparent;text-align:left;padding:0}.problem .open:hover h3{text-decoration:underline}.badge{font-size:11px;padding:5px 10px;border:1px solid var(--line);border-radius:20px;white-space:nowrap}.badge.solved{background:#e3efdc;color:#34572d;border-color:#c7dabc}.badge.trying{background:#fff1cf;color:#7d6425}.hint-used{font-size:11px;color:var(--muted);display:inline-block;margin-left:8px}.arrow{font-size:20px;padding:4px 13px}.method{margin:55px 0;background:#eceee3;border-radius:12px;padding:28px 30px}.method h2{font-size:21px;margin:0 0 22px}.method>div{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.method b{font-size:13px;color:var(--green)}.method p{font-size:13px;color:var(--muted);margin-bottom:0}footer{border-top:1px solid var(--line);padding:23px 0 32px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:15px;font-size:12px;color:var(--muted)}footer>div{display:flex;gap:12px;align-items:center}footer button,.import-label{font-size:12px;padding:4px 8px}footer p{width:100%;font-size:11px;margin:0}.import-label{cursor:pointer;border:1px solid var(--line);border-radius:5px}.import-label input{position:absolute;width:1px;height:1px;opacity:0}.import-label:focus-within{outline:2px solid var(--green)}dialog{width:min(600px,calc(100% - 24px));max-height:90vh;border:1px solid var(--line);border-radius:14px;padding:28px;color:var(--ink);background:var(--paper)}dialog::backdrop{background:#10251ac2}dialog h2{font-size:26px;line-height:1.3;margin:13px 0 10px}.dialog-head{display:flex;justify-content:space-between;align-items:center}.dialog-head .eyebrow{margin:0}.dialog-head button{background:transparent;border:0;padding:3px 8px}.status-label{margin-top:22px}.hints{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:23px 0;padding-bottom:23px}h3{font-size:17px}.hint{background:white;border:1px solid var(--line);border-radius:8px;padding:14px;margin:12px 0;font-size:14px}.hint b{display:block;color:var(--green);font-size:11px;margin-bottom:5px}#reflection{background:#e9eedb;padding:2px 18px 12px;border-radius:8px;margin-bottom:20px}#reflection p{font-size:14px}#save-note{margin-top:12px}#auth-form label{margin:15px 0}.auth-actions{display:flex;gap:10px}#auth-feedback,#detail-feedback{font-size:13px;overflow-wrap:anywhere}[hidden]{display:none!important}@media(max-width:700px){.top{height:75px;padding:0 20px}.top-note{display:none}main{padding:0 20px}.hero{grid-template-columns:1fr;gap:28px;padding:40px 0 30px}h1{font-size:43px}.thought{min-height:225px}.thought p{font-size:24px;margin:14px 0 22px}.stats{grid-template-columns:repeat(2,1fr);gap:22px 0}.stats>div:nth-child(2){border:0}.stats strong{font-size:24px}.section-head{align-items:start;gap:14px}.section-head>p{max-width:150px;font-size:11px}.filters{grid-template-columns:1fr 1fr}.search{grid-column:1/-1}.problem{grid-template-columns:25px 1fr auto;gap:10px}.problem .arrow{display:none}.problem h3{font-size:14px}.badge{font-size:10px}.method{padding:23px}.method>div{grid-template-columns:1fr;gap:18px}footer>div{flex-wrap:wrap}.hint-used{display:block;margin-left:0}dialog{padding:22px}}

/* Community and username controls */
.solvers{margin:22px 0;padding:16px 18px;background:#edf1e4;border:1px solid var(--line);border-radius:10px}.solvers-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.solvers-head h3{margin:0}.solvers-head button,#more-solvers{font-size:12px;padding:5px 10px}#solver-count{font-size:12px;color:var(--muted);font-weight:400}#solver-list{list-style:none;padding:0;margin:10px 0;display:flex;flex-wrap:wrap;gap:8px}#solver-list li{padding:5px 10px;background:white;border:1px solid var(--line);border-radius:20px;font-size:13px;overflow-wrap:anywhere;max-width:100%}#solver-list li.mine{background:var(--green);color:white}#solvers-message,#profile-feedback{font-size:13px;overflow-wrap:anywhere}#profile-form{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:4px 0 20px;margin:20px 0}#profile-form h3{margin-bottom:8px}#profile-form #username{text-transform:lowercase}.top #account{max-width:210px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* Catalog filters, ratings and priority */
.catalog-controls{display:grid;grid-template-columns:2fr 1fr 1fr;gap:15px;margin-top:14px}.catalog-toggles{display:flex;align-items:center;flex-wrap:wrap;gap:16px;margin-top:17px}.catalog-toggles label{display:flex;align-items:center;gap:7px;cursor:pointer}.catalog-toggles input{display:inline;width:16px;height:16px;margin:0;accent-color:var(--green)}.catalog-toggles button{font-size:12px;padding:5px 10px}.catalog-toggles #results-count{margin-left:auto;font-size:12px;color:var(--muted)}.rating-legend{font-size:11px;color:var(--muted);margin-bottom:0}.problem-meta{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:6px}.rating{display:inline-block;border:1px solid #c7d3bc;background:#e8eddf;color:#3d542f;font:700 11px/1.5 system-ui;padding:2px 8px;border-radius:5px;white-space:nowrap}.rating-19,.rating-20,.rating-21{background:#e8e2f5;border-color:#d2c4e6;color:#665185}.rating-22,.rating-23,.rating-24,.rating-25{background:#f8e8d0;border-color:#ead0aa;color:#8d5a25}.priority-star{display:inline-block;color:#9a6d12;margin-right:7px;font-size:16px;text-decoration:none}.tag-chips{display:flex;gap:6px;flex-wrap:wrap;margin:9px 0 3px}.tag-chip{padding:2px 8px;border-radius:5px;background:#e9ece4;border:1px solid var(--line);color:#52644f;font-size:11px;font-weight:400}.problem.is-priority .number{color:#91650f}.subtle{display:block;font-size:11px;padding:4px 9px;margin-bottom:14px;background:transparent}#detail-tags{margin-bottom:16px}#editorial-link{font-size:13px}#pack-note{line-height:1.7}.problem-list .open{min-width:0}.problem h3{overflow-wrap:anywhere}@media(max-width:700px){.catalog-controls{grid-template-columns:1fr 1fr}.catalog-controls>label:first-child{grid-column:1/-1}.catalog-toggles{gap:12px}.catalog-toggles #results-count{width:100%;margin-left:0}.tag-chips{gap:5px}.tag-chip{font-size:10px}.problem{align-items:start}.problem .badge{margin-top:3px}}

/* Account profiles and community */
.community-section{margin:48px 0;border:1px solid var(--line);border-radius:14px;padding:26px;background:#fff7}.community-section .section-head{margin:0 0 18px}.community-tabs{display:flex;gap:10px;flex-wrap:wrap}.community-tabs [aria-selected=true]{background:var(--green);color:white;border-color:var(--green)}.people-list{padding:0;list-style:none;margin:18px 0}.people-list>li{border-top:1px solid var(--line);padding:12px 0}.people-list>li:last-child{border-bottom:1px solid var(--line)}.person{width:100%;display:flex;align-items:center;gap:14px;padding:8px;border:0;background:transparent;text-align:left;min-width:0}.person:hover{background:#edf1e4}.avatar{position:relative;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:52px;height:52px;background:#dce8cc;color:var(--green);font-size:23px;font-weight:700;border-radius:50%;overflow:hidden;object-fit:cover}.avatar img{position:absolute;width:100%;height:100%;object-fit:cover;inset:0}.person-info{flex:1;min-width:0}.person-info strong,.person-info small{display:block;overflow-wrap:anywhere}.person-info small{font-size:12px;color:var(--muted)}.person-score{font-size:12px;white-space:nowrap;font-weight:700}.community-rank{font-size:13px;color:var(--muted)}.pagination{display:flex;gap:15px;align-items:center;justify-content:center}.pagination span{font-size:12px;color:var(--muted)}.friend-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.friend-actions button{font-size:12px;padding:6px 12px}.wide-dialog{width:min(760px,calc(100% - 24px))}.profile-heading{display:flex;gap:20px;align-items:center;margin-bottom:20px}.profile-heading .avatar{width:80px;height:80px;font-size:32px}.profile-heading p{margin:4px 0}.profile-username{font-weight:600}.profile-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.profile-stats strong{background:#e9eedb;border-radius:8px;padding:12px;font-size:14px;text-align:center}.profile-problems{display:grid;grid-template-columns:1fr 1fr;gap:20px}.profile-problems ul{list-style:none;padding:0}.profile-problems li{margin:8px 0}.profile-problems button{font-size:13px;width:100%;text-align:left;overflow-wrap:anywhere}.own-avatar-preview{margin:15px 0}.own-avatar-preview .avatar{width:80px;height:80px}.check-label{display:flex;gap:8px;align-items:center}.check-label input{width:16px;height:16px;margin:0}.account-shortcuts{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}#profile-form label{margin:14px 0}#recovery form label{margin:18px 0}#recovery .auth-actions{flex-wrap:wrap}#solver-list li{padding:0}#solver-list li button{border:0;border-radius:20px;padding:5px 10px;font-size:13px;background:transparent;color:inherit}#solver-list li button:hover{background:#dce8cc}#profile-feedback,#public-profile-message,#community-message{overflow-wrap:anywhere}@media(max-width:700px){.community-section{padding:18px}.person{gap:9px}.person-score{font-size:11px}.community-rank{font-size:11px}.avatar{width:42px;height:42px}.profile-stats{grid-template-columns:1fr 1fr}.profile-problems{grid-template-columns:1fr}.account-shortcuts button{font-size:13px}}

.site-nav{max-width:1140px;margin:auto;padding:14px 30px 0;display:flex;gap:20px;align-items:center;flex-wrap:wrap}.site-nav a,.site-nav button{font-size:13px;font-weight:600;color:var(--green)}.site-nav button{padding:0;border:0;background:transparent;text-decoration:underline}.site-nav a:hover,.site-nav button:hover{color:#477d4b}@media(max-width:700px){.site-nav{padding:14px 20px 0;gap:18px}}
#public-profile-name,#auth-info{overflow-wrap:anywhere}.profile-heading>div{min-width:0}.profile-heading p{overflow-wrap:anywhere}

/* Catalog administration and bilingual hints */
.admin-section{margin:48px 0;border:1px solid #c5cfae;border-radius:14px;padding:26px;background:#eef2e3}.admin-section .section-head{margin:0 0 18px}.admin-picker,.admin-fields,.admin-hints{display:grid;grid-template-columns:1fr 1fr;gap:16px}.admin-fields{margin:22px 0}.admin-fields>label,.admin-picker>label{min-width:0}.wide-field{grid-column:1/-1}.admin-hints fieldset{border:1px solid var(--line);border-radius:10px;padding:16px;min-width:0;background:#fff8}.admin-hints legend{font-size:14px;font-weight:700;color:var(--green)}.admin-hints label{margin-bottom:13px}#admin-form>label{margin:18px 0}.admin-id{font-size:14px;font-weight:700;color:var(--green)}.danger{color:#963d32;border-color:#caa7a0}.hint-language-label{max-width:210px;margin-bottom:14px}.number{white-space:nowrap}.problem{grid-template-columns:52px 1fr auto auto}@media(max-width:700px){.admin-section{padding:18px}.admin-picker,.admin-fields,.admin-hints{grid-template-columns:1fr}.wide-field{grid-column:auto}.problem{grid-template-columns:37px 1fr auto;gap:9px}}
.admin-tools{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0}.admin-tools>section{min-width:0;border:1px solid var(--line);padding:18px;border-radius:10px;background:#fff8}.admin-tools h3{margin-top:0}.admin-tools label{margin:14px 0}.admin-tools p,.admin-tools li{overflow-wrap:anywhere}#admin-import-preview{max-height:240px;overflow:auto;padding-left:24px}#admin-import-preview:empty{display:none}@media(max-width:700px){.admin-tools{grid-template-columns:1fr}}

/* Custom sources, rating bounds and problem pages */
.catalog-controls{grid-template-columns:2fr repeat(4,1fr)}.problem-pagination{margin:24px 0;flex-wrap:wrap}.problem-pagination button:disabled{cursor:default}.problem-pagination span{text-align:center}#rating-range-message:empty{display:none}@media(max-width:900px){.catalog-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.catalog-controls>label:first-child{grid-column:1/-1}}

/* Erdene Club tutorials */
.brand{gap:3px;white-space:nowrap}.brand .logo{margin-right:8px}.brand>span:last-child{margin-left:4px}.tutorial-section{margin:48px 0;padding-top:8px;scroll-margin-top:20px}.tutorial-filters{display:grid;grid-template-columns:2fr 1fr;gap:16px;margin:22px 0 12px}.tutorial-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.tutorial-card{display:flex;flex-direction:column;gap:12px;text-decoration:none;background:white;border:1px solid var(--line);border-radius:12px;padding:21px;min-width:0;transition:border-color .15s,transform .15s}.tutorial-card:hover{border-color:var(--green);transform:translateY(-2px)}.tutorial-card h3{margin:0;font-size:18px;line-height:1.35}.tutorial-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}.tutorial-card .eyebrow{font-size:10px;margin:0;color:var(--green)}.tutorial-card small{margin-top:auto;font-size:11px;color:var(--muted)}.tutorial-reader-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:25px 0}.tutorial-back{display:inline-block;font-size:13px;font-weight:650;color:var(--green);margin:14px 0}.tutorial-reader-actions button{font-size:12px}#tutorial-title{font-size:clamp(26px,4vw,38px);letter-spacing:-1px;line-height:1.3;margin:15px 0}.tutorial-lead{max-width:760px;font-size:17px;line-height:1.8}.tutorial-reading-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:32px;align-items:start;margin:25px 0}.tutorial-toc{position:sticky;top:18px;border:1px solid var(--line);border-radius:10px;padding:15px;background:#fff7}.tutorial-toc strong{display:block;font-size:13px;margin-bottom:10px}.tutorial-toc a{display:block;text-decoration:none;color:var(--muted);font-size:12px;padding:7px 0;line-height:1.5}.tutorial-toc a:hover{color:var(--green);text-decoration:underline}.tutorial-content{min-width:0;line-height:1.9}.tutorial-content section{scroll-margin-top:20px}.tutorial-content h3{font-size:23px;margin:34px 0 14px;letter-spacing:-.4px}.tutorial-content section:first-child h3{margin-top:0}.tutorial-content p,.tutorial-content li{font-size:15px;overflow-wrap:anywhere}.tutorial-content ul,.tutorial-content ol{padding-left:24px}.tutorial-content li{margin:8px 0}.tutorial-content code{font-size:13px;background:#e7ebdf;padding:2px 5px;border-radius:4px}.tutorial-code{position:relative;margin:20px 0}.tutorial-code pre{overflow:auto;background:#142c23;color:#f1f4e7;padding:42px 20px 20px;border-radius:10px;line-height:1.7;margin:0;tab-size:4}.tutorial-code pre code{background:none;padding:0;color:inherit;font:13px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}.tutorial-code button{position:absolute;top:7px;right:9px;font-size:11px;padding:4px 9px;background:#234737;color:#e8f49b;border-color:#446450}.tutorial-math{overflow-x:auto;overflow-y:hidden;border-left:3px solid #9fb651;background:#eff2e6;padding:12px 18px;margin:20px 0;max-width:100%}.tutorial-table-wrap{overflow-x:auto;margin:20px 0}.tutorial-content table{border-collapse:collapse;width:100%;font-size:13px;background:white}.tutorial-content th,.tutorial-content td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}.tutorial-content th{background:#e8eddf}.tutorial-note{border:1px solid #d6dfb9;border-radius:10px;background:#eef2df;padding:15px 18px;margin:20px 0}.tutorial-note p{margin:0;font-size:14px}.tutorial-related{display:flex;gap:12px;flex-wrap:wrap;align-items:center;border-top:1px solid var(--line);padding-top:22px;margin-top:30px}.tutorial-related h3{width:100%;margin:0;font-size:16px}.tutorial-related a{font-size:13px;border:1px solid var(--line);padding:7px 12px;border-radius:8px;background:white;text-decoration:none}.tutorial-content .tutorial-reading-links a{color:var(--green)}mjx-container{max-width:100%}#tutorial-math-message:empty,#tutorial-message:empty{display:none}@media(max-width:900px){.tutorial-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tutorial-reading-layout{grid-template-columns:170px minmax(0,1fr);gap:20px}}@media(max-width:700px){.tutorial-filters,.tutorial-grid,.tutorial-reading-layout{grid-template-columns:1fr}.tutorial-toc{position:static}.tutorial-toc a{display:inline-block;margin-right:14px}.tutorial-content h3{font-size:21px}.tutorial-content p,.tutorial-content li{font-size:14px}.tutorial-card{padding:18px}.tutorial-reader-actions{flex-wrap:wrap}.top{gap:12px}.brand{font-size:21px}.tutorial-math{padding:10px}.tutorial-code pre{padding-left:12px;padding-right:12px}.tutorial-reader-actions button{padding:7px 10px}}

#tutorial-title:focus{outline:none}
/* Distinct screens, bilingual tutorials and Codeforces-style math prose. */
[hidden]{display:none!important}.site-nav [aria-current="page"]{color:var(--green);font-weight:700;border-bottom:2px solid currentColor}.site-nav{flex-wrap:wrap}main>section:not(.hero):not(.stats){scroll-margin-top:20px}.tutorial-options{display:flex;gap:18px;margin:24px 0}.tutorial-options label{min-width:180px}.tutorial-level-heading{grid-column:1/-1;margin:26px 0 2px;font-size:23px;border-bottom:1px solid #d9ddd2;padding-bottom:12px}.tutorial-card h4{font-size:21px;margin:8px 0 14px;line-height:1.3}.tutorial-content{font-size:17px;line-height:1.85}.tutorial-content p,.tutorial-content li{overflow-wrap:break-word}.tutorial-content mjx-container{font-size:109%!important}.tutorial-content mjx-container[display="true"]{font-size:112%!important;overflow-x:auto;overflow-y:hidden;padding:8px 0}.tutorial-math{background:#f8f9f4;border-left:3px solid #99b54d}.tutorial-code{background:#1e2430;color:#d8dee9;border-radius:9px;overflow:hidden;margin:25px 0}.tutorial-code pre{margin:0;padding:22px;overflow:auto;background:transparent}.tutorial-code code{font-size:14px;line-height:1.65;font-family:Consolas,'Liberation Mono',monospace;white-space:pre;overflow-wrap:normal}.code-toolbar{display:flex;align-items:center;justify-content:space-between;padding:9px 16px;background:#303847;color:#d8dee9;font-family:monospace}.tutorial-code .code-toolbar button{position:static;background:transparent;color:#d8dee9;border:1px solid #526074;padding:5px 10px}.hljs-keyword,.hljs-type{color:#c792ea}.hljs-number,.hljs-literal{color:#f78c6c}.hljs-string,.hljs-char{color:#c3e88d}.hljs-comment{color:#8fa0b6;font-style:italic}.hljs-title,.hljs-built_in{color:#82aaff}.hljs-meta{color:#89ddff}.hljs-params{color:#d8dee9}.hljs-subst{color:#d8dee9}.hljs-symbol{color:#ffcb6b}.tutorial-edit-section{border:1px solid #dce1d4;border-radius:8px;padding:15px;margin:12px 0}.tutorial-edit-section summary{cursor:pointer;font-weight:700;margin-bottom:12px}.tutorial-edit-section textarea{font-family:Consolas,'Liberation Mono',monospace;font-size:14px;width:100%;tab-size:4}.tutorial-edit-section label{display:block;margin:16px 0}#tutorial-preview{max-width:1000px;width:92vw}#tutorial-preview-content{padding:10px 12px}#route-message{margin:40px 0}
@media(max-width:700px){.tutorial-options{flex-direction:column;gap:8px}.tutorial-content{font-size:16px}.tutorial-code pre{padding:15px}.tutorial-code code{font-size:13px}.site-nav{gap:14px}.tutorial-card h4{font-size:20px}}

.tutorial-content p,.tutorial-content li{font-size:17px}.tutorial-section{margin:24px 0}.tutorial-code pre code{font:14px/1.65 Consolas,'Liberation Mono',monospace}@media(max-width:700px){.tutorial-content p,.tutorial-content li{font-size:16px}.tutorial-code pre code{font-size:13px}}

.tutorial-prerequisite-links{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 22px}.tutorial-prerequisite-links strong{font-size:13px}.tutorial-prerequisite-links a,.tutorial-lesson-navigation a{font-size:13px;color:var(--green);border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px 12px;text-decoration:none}.tutorial-lesson-navigation{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin:28px 0}.segment-demo{padding:20px;background:#f0f3e8;border:1px solid #cbd7b7;border-radius:12px;margin:24px 0}.segment-demo h4{margin-top:0;font-size:18px}.segment-demo-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.segment-demo-controls input,.segment-demo-controls select{width:100%;min-width:0}.segment-demo-controls button{grid-column:3/5}.segment-demo-level{display:flex;justify-content:center;gap:12px;margin:14px 0}.segment-demo-level:first-child{max-width:45%;margin-left:auto;margin-right:auto}.segment-demo-level:nth-child(2){max-width:80%;margin-left:auto;margin-right:auto}.segment-demo-node{flex:1;min-width:0;text-align:center;padding:10px 4px;border:1px solid #cbd2c3;background:#fff;border-radius:9px;display:grid;font-size:12px}.segment-demo-node.covered{background:#e0efcc;border-color:#719445}.segment-demo-node.partial{background:#fff0c6;border-color:#c8a743}.segment-demo-node.excluded{background:#e6e8e4;color:#6c756d}.segment-demo-answer{font-weight:700}.segment-demo .segment-demo-node mjx-container{font-size:100%!important}.segment-demo-output ol{font-size:13px}@media(max-width:700px){.segment-demo{padding:12px}.segment-demo-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.segment-demo-controls button{grid-column:1/3}.segment-demo-level{gap:4px}.segment-demo-node{font-size:10px;padding:9px 2px}.segment-demo-level:first-child{max-width:60%}.segment-demo-level:nth-child(2){max-width:90%}.tutorial-lesson-navigation a{width:100%;overflow-wrap:anywhere}}

.tutorial-reading-choice{display:block;max-width:270px;margin:22px 0}.tutorial-reading-choice span{display:block;margin-bottom:7px}.tutorial-reading-main{min-width:0}.tutorial-toc [aria-current="step"]{color:var(--green);font-weight:700}.tutorial-section-nav{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid var(--line);margin-top:30px;padding-top:22px}.tutorial-section-nav p{margin:0;font-size:13px;white-space:nowrap}.tutorial-section-nav button{font-size:13px}.tutorial-section-nav button:disabled{opacity:.45;cursor:default}.tutorial-disclosure summary{cursor:pointer;font-weight:650;line-height:1.6}.tutorial-disclosure[open] summary{margin-bottom:12px}.tutorial-disclosure summary:focus-visible{outline:2px solid var(--green);outline-offset:5px}.tutorial-sample{background:#f4f6ef;color:#21382b;border:1px solid #d6dfcc}.tutorial-sample .code-toolbar{background:#e7eddf;color:#21382b}.tutorial-sample .code-toolbar button{color:#21382b;border-color:#bbcbb0}.tutorial-sample pre code{color:#21382b}@media(max-width:700px){.tutorial-section-nav{flex-wrap:wrap}.tutorial-section-nav p{order:-1;width:100%}.tutorial-toc [aria-current="step"]{text-decoration:underline}.tutorial-reading-choice{max-width:100%}}
/* Study groups and daily reports */
.groups-section{margin:40px 0 60px}.groups-section h3{font-size:25px;margin:10px 0}.group-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:22px}.group-card{display:block;padding:22px;border:1px solid var(--line);border-radius:12px;background:#fff9;color:var(--ink);text-decoration:none;min-width:0;overflow-wrap:anywhere}.group-card:hover{border-color:var(--green);background:#fff}.group-card h3{font-size:20px}.group-card .group-text{font-size:13px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.group-toolbar,.group-actions,.group-day-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.group-toolbar{margin:18px 0}.group-toolbar>p{margin-right:auto}.group-actions button{font-size:13px}.group-day-bar{padding:20px;background:#edf1e4;border:1px solid var(--line);border-radius:12px}.group-day-bar>label{min-width:170px}.group-day-bar #group-own-report{margin-left:auto}.group-toolbar label{min-width:190px}.group-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}.group-reports{display:grid;gap:15px}.group-report-card{background:#fff9;border:1px solid var(--line);border-radius:12px;padding:22px;min-width:0}.group-report-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.group-report-head>div{margin-right:auto}.group-report-head h4{margin:0 0 3px;font-size:17px;overflow-wrap:anywhere}.group-report-field{margin-top:18px}.group-report-field>strong{font-size:12px;color:var(--green)}.group-report-field p{margin:5px 0;font-size:14px}.group-member-list{list-style:none;padding:0}.group-member-list li{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:14px 0;border-bottom:1px solid var(--line);flex-wrap:wrap}.group-member-list p{margin:3px 0}.group-member-list .group-actions button{font-size:11px;padding:6px 10px}.groups-section dialog{width:min(720px,calc(100% - 24px))}.groups-section dialog label{margin:15px 0}.groups-section dialog h2{font-size:23px}.groups-section dialog p[role=status]{font-size:13px;overflow-wrap:anywhere;white-space:pre-wrap}.group-count-field{display:flex;gap:15px;align-items:center;flex-wrap:wrap}.group-count-field button{font-size:12px;margin-top:10px}.group-export-range{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.group-export-range>button{grid-column:1/-1;justify-self:start}.group-date-chips{display:flex;flex-wrap:wrap;gap:8px;max-height:200px;overflow:auto;padding:8px 0}.group-date-chips button{font-size:12px;background:#edf1e4;border-radius:20px}#group-export-dialog>p{font-size:14px}.groups-section .group-day-bar input{background:#fff}.groups-section a{overflow-wrap:anywhere}.groups-section dialog input,.groups-section dialog textarea{max-width:100%}.groups-section #group-message{min-height:22px}
@media(max-width:850px){.group-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.group-grid{grid-template-columns:1fr}.groups-section .section-head{flex-wrap:wrap}.group-day-bar{padding:15px;gap:9px}.group-day-bar #group-own-report{width:100%;justify-content:center;margin-left:0}.group-report-card{padding:16px}.group-export-range{grid-template-columns:1fr}.group-report-head .badge{font-size:10px}.group-toolbar{gap:10px}.group-toolbar label{min-width:0;flex:1}.groups-section dialog{padding:20px}.group-actions{gap:8px}.group-actions button{padding:8px 10px}}

@media(max-width:600px){.group-toolbar>p{flex-basis:100%;margin:0}.group-toolbar label{flex:1 1 180px}}

/* Home workspace and report student selection. */
:root { --home-surface:#fff; --home-soft:#f0f4ef; }
.top { height:78px; }
.site-nav { gap:5px; padding-top:12px; padding-bottom:12px; }
.site-nav a { padding:7px 10px; border-radius:6px; text-decoration:none; font-size:13px; font-weight:550; line-height:1.5; }
.site-nav a[aria-current="page"] { border-bottom:0; background:var(--home-soft); color:var(--green); }
.site-nav a:hover { background:var(--home-soft); }
.hero.home-intro { grid-template-columns:minmax(0,1.15fr) minmax(0,1fr); align-items:center; gap:64px; padding:46px 0 32px; }
.home-lead { min-width:0; }
.home-kicker { color:var(--muted); font-size:10px; font-weight:700; letter-spacing:1.6px; margin:0 0 16px; }
#home-title { max-width:15ch; font-size:clamp(34px,4.2vw,48px); line-height:1.17; letter-spacing:-1.8px; font-weight:750; margin:0 0 18px; }
.home-lead .intro { max-width:440px; font-size:15px; line-height:1.8; margin:0 0 26px; }
.home-actions { display:flex; align-items:center; flex-wrap:wrap; gap:12px; }
.home-actions .primary { gap:25px; padding:12px 18px; }
.home-secondary { display:inline-flex; align-items:center; gap:18px; border:1px solid var(--line); border-radius:7px; padding:11px 18px; font-size:14px; font-weight:600; text-decoration:none; background:var(--home-surface); }
.home-secondary:hover { border-color:var(--green); }
.home-sources { display:flex; flex-wrap:wrap; gap:10px; color:var(--muted); font-size:11px; margin:24px 0 0; }
.home-sources span { opacity:.5; }
.home-continue { min-width:0; background:var(--home-surface); border:1px solid var(--line); border-radius:12px; padding:22px 24px; box-shadow:0 8px 26px #172d2505; }
.home-continue-head { display:flex; align-items:center; justify-content:space-between; gap:10px; }
.home-continue-head .home-kicker { margin:0; }
.home-count { border:1px solid var(--line); border-radius:20px; padding:3px 9px; font-size:11px; color:var(--muted); white-space:nowrap; }
.home-continue h2 { font-size:19px; line-height:1.4; letter-spacing:-.4px; margin:12px 0 14px; }
.home-recent { display:flex; align-items:center; justify-content:space-between; gap:12px; width:100%; min-width:0; border:0; border-top:1px solid var(--line); border-radius:0; text-align:left; background:transparent; padding:12px 0; }
.home-recent:hover { background:var(--home-soft); }
.home-recent-info { display:block; min-width:0; }
.home-recent strong { display:block; font-size:13px; line-height:1.5; font-weight:600; overflow-wrap:anywhere; }
.home-recent small { display:block; color:var(--muted); font-size:11px; margin-top:3px; }
.home-recent-arrow { color:var(--muted); font-size:18px; flex-shrink:0; }
.home-empty { min-height:116px; display:flex; flex-direction:column; justify-content:center; border-top:1px solid var(--line); }
.home-empty strong { font-size:13px; font-weight:550; }
.home-empty p { font-size:12px; color:var(--muted); line-height:1.8; max-width:300px; margin:6px 0 0; }
.home-all { display:flex; justify-content:space-between; padding-top:12px; margin-top:4px; border-top:1px solid var(--line); color:var(--green); font-size:12px; font-weight:600; text-decoration:none; }
.home-all:hover { text-decoration:underline; }
.stats { background:var(--home-surface); border-radius:12px; padding:24px 0; }
.stats strong { font-size:30px; font-variant-numeric:tabular-nums; letter-spacing:-.8px; }
.method.home-sections { background:transparent; padding:0; margin:36px 0 48px; }
.home-sections h2 { font-size:17px; letter-spacing:-.3px; margin:0 0 16px; }
.home-sections .home-links { grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px; }
.home-section-card { display:block; min-width:0; border:1px solid var(--line); border-radius:10px; padding:22px; background:var(--home-surface); text-decoration:none; transition:border-color .15s,box-shadow .15s; }
.home-section-card:hover { border-color:var(--green); box-shadow:0 4px 14px #172d2508; }
.home-card-top { display:flex; align-items:center; justify-content:space-between; margin-bottom:23px; color:var(--muted); font:11px ui-monospace,SFMono-Regular,Consolas,monospace; }
.home-card-top svg { width:23px; height:23px; fill:none; stroke:var(--green); stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; }
.home-section-card h3 { display:flex; align-items:center; justify-content:space-between; gap:8px; margin:0 0 9px; font-size:16px; font-weight:650; }
.home-section-card h3 span { color:var(--muted); font-weight:400; }
.home-section-card p { line-height:1.8; margin:0; font-size:12px; }
.group-export-students { border:1px solid var(--line); border-radius:8px; padding:16px; margin:18px 0; min-width:0; }
.group-export-students legend { font-size:13px; font-weight:650; padding:0 5px; }
.group-export-students>p:first-of-type { margin-top:0; font-size:12px; }
.group-export-student-actions { display:flex; flex-wrap:wrap; gap:8px; margin:12px 0; }
.group-export-student-actions button { font-size:12px; padding:6px 10px; }
.group-export-students-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; max-height:240px; overflow-y:auto; overscroll-behavior:contain; padding:3px; }
.groups-section dialog .group-export-student { display:flex; align-items:flex-start; gap:9px; min-width:0; margin:0; border:1px solid var(--line); border-radius:7px; padding:10px; cursor:pointer; background:var(--home-surface); }
.group-export-student:has(input:checked) { border-color:var(--green); background:var(--home-soft); }
.group-export-student:focus-within { outline:2px solid var(--green); outline-offset:0; }
.group-export-student input[type=checkbox] { width:17px; height:17px; margin:2px 0 0; flex-shrink:0; accent-color:var(--green); }
.group-export-student span { min-width:0; overflow-wrap:anywhere; }
.group-export-student strong { display:block; font-size:12px; line-height:1.6; }
.group-export-student small { display:block; font-size:11px; font-weight:400; }
.group-export-students-list>p { grid-column:1/-1; margin:8px 0; }
@media(max-width:800px) {
    .hero.home-intro { gap:28px; }
    .home-continue { padding:20px; }
    .home-section-card { padding:18px; }
}
@media(max-width:700px) {
    .top { height:72px; }
    .site-nav { gap:3px; }
    .site-nav a { padding:6px 8px; font-size:12px; }
    .hero.home-intro { grid-template-columns:1fr; padding:32px 0 24px; gap:28px; }
    #home-title { max-width:none; font-size:36px; letter-spacing:-1px; }
    .home-lead .intro { font-size:14px; margin-bottom:22px; }
    .home-sources { margin-top:20px; }
    .stats strong { font-size:26px; }
    .stats>div { padding:0 18px; }
    .home-sections .home-links { grid-template-columns:1fr; gap:12px; }
    .home-card-top { margin-bottom:16px; }
    .method.home-sections { margin:28px 0 36px; }
}
@media(max-width:560px) {
    .group-export-students-list { grid-template-columns:1fr; }
    .group-export-students { padding:12px; }
}
@media(prefers-reduced-motion:reduce) { .home-section-card { transition:none; } }