.ch-body{background:#faf7f0;color:#172a24;margin:0;font-family:'Inter Tight',sans-serif}.ch-body *{box-sizing:border-box}.ch-body [hidden]{display:none!important}.ch-wrap{max-width:1200px;margin:auto;padding:0 32px}.ch-nav{display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:1440px;padding:24px 36px;margin:auto;border-bottom:1px solid #dcded4}.ch-logo{display:flex;align-items:center;gap:10px;font-family:Fraunces,serif;font-size:25px;white-space:nowrap}.ch-mark{background:#142a22;color:#83e0b7;padding:0 10px;border-radius:8px;font-style:italic}.ch-logo small{font:12px 'Inter Tight',sans-serif}.ch-nav-divider{color:#a3ab9d;margin:0 5px}.ch-nav nav{display:flex;align-items:center;gap:24px;font-size:14px}.ch-button{display:inline-flex;align-items:center;justify-content:center;gap:28px;background:#172f27;color:#fff;border:1px solid transparent;border-radius:10px;padding:16px 22px;font:600 15px 'Inter Tight',sans-serif;cursor:pointer;text-decoration:none;line-height:1.4}.ch-button:hover{background:#294b3e;color:#fff}.ch-button.small{padding:11px 15px;font-size:13px}.ch-button.secondary{color:#172f27;background:transparent;border-color:#9ea99e}.ch-button:disabled{cursor:not-allowed;opacity:.5}.ch-body a:focus-visible,.ch-body button:focus-visible,.ch-body input:focus-visible{outline:3px solid #5782cb;outline-offset:4px}.ch-link{text-decoration:underline;text-underline-offset:5px;font-weight:600}.ch-hero{display:grid;grid-template-columns:1.1fr 1fr;gap:55px;align-items:center;padding:66px 0 40px}.ch-eyebrow{font:11px 'JetBrains Mono',monospace;letter-spacing:.12em;line-height:1.8;text-transform:uppercase}.ch-live-dot{display:inline-block;background:#38a774;border-radius:50%;width:7px;height:7px;margin-right:7px}.ch-body h1,.ch-body h2,.ch-home-spot h2{font-family:Fraunces,serif;font-weight:500;letter-spacing:-.045em}.ch-body h1{font-size:clamp(42px,4.9vw,70px);line-height:1.06;margin:22px 0}.ch-body h2{font-size:clamp(32px,3.5vw,46px);line-height:1.15;margin:12px 0 22px}.ch-body h3{font:500 25px Fraunces,serif;line-height:1.25;letter-spacing:-.02em}.ch-body p{line-height:1.65}.ch-body em,.ch-home-spot em{font-weight:400;color:#496b53}.ch-lead{font-size:18px;color:#52615a;max-width:640px}.ch-actions{display:flex;flex-wrap:wrap;gap:20px;align-items:center;margin:26px 0 16px}.ch-caption{font-size:12px;color:#58685d;line-height:1.7}.ch-poster{background:#142a29;border-radius:26px;padding:30px;color:#e6ece5;box-shadow:0 22px 50px #17332716;transform:rotate(1deg)}.ch-poster-top{display:flex;align-items:center;justify-content:space-between;font:10px 'JetBrains Mono',monospace;letter-spacing:.14em;line-height:1.8}.ch-poster-top img{border-radius:13px}.ch-art-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:28px 32px}.ch-art-grid i{display:flex;align-items:center;justify-content:center;aspect-ratio:1;border-radius:14px;font-style:normal;font-size:44px;color:#172f2e;background:#91d8bb}.ch-art-grid i:nth-child(3n){background:#c3b8ed}.ch-art-grid i:nth-child(4n){background:#f0af98}.ch-art-grid i:nth-child(5){background:transparent;color:#eee;border:1px dashed #688a7f}.ch-poster-stats{display:flex;justify-content:space-between;border-top:1px solid #ffffff30;padding-top:20px;gap:12px}.ch-poster-stats b{display:block;font:34px Fraunces,serif;color:#bce6c8}.ch-poster-stats span{font-size:10px}.ch-date-strip{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:24px 0;border-block:1px solid #d9ddcf;font-size:14px}.ch-date-strip>span:first-child{font:10px 'JetBrains Mono',monospace;letter-spacing:.1em}.ch-date-strip a{text-decoration:underline;text-underline-offset:4px}.ch-section{padding:70px 0;border-bottom:1px solid #d9ddcf}.ch-section-head{max-width:760px;margin-bottom:30px}.ch-prize{display:grid;grid-template-columns:220px 1fr;gap:45px;background:#e8ecdf;border:1px solid #d5ddca;border-radius:22px;padding:36px}.ch-prize-number{font:140px Fraunces,serif;letter-spacing:-.09em;line-height:1.1;color:#486348;border-right:1px solid #c8d3bc}.ch-prize-number span{display:block;letter-spacing:.17em;font:11px 'JetBrains Mono',monospace}.ch-prize h3{margin:0 0 12px;font-size:32px}.ch-tags{display:flex;gap:8px;flex-wrap:wrap}.ch-tags span{padding:6px 12px;border:1px solid #bac8b2;border-radius:20px;font-size:12px}.ch-steps,.ch-modes{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.ch-steps article{padding:24px 0;border-top:2px solid #aab89e}.ch-steps b{font:18px 'JetBrains Mono',monospace;color:#627958}.ch-steps h3{margin:22px 0 12px}.ch-modes{margin-bottom:25px}.ch-modes article{padding:24px;background:#f1eee6;border:1px solid #deddd0;border-radius:14px}.ch-modes article>span{display:block;font-size:30px;color:#4c6b55}.ch-modes h3{font-size:23px;margin:16px 0 10px}.ch-modes p{font-size:14px;margin:0;color:#52615a}.ch-rules{display:grid;grid-template-columns:1fr 1.5fr;gap:60px}.ch-rules details{border-bottom:1px solid #ced5c7;padding:16px 0}.ch-rules summary{cursor:pointer;font-weight:600}.ch-rules details p{font-size:14px;color:#52615a}.ch-footer{max-width:1280px;margin:auto;padding:35px 32px;display:flex;justify-content:space-between;gap:25px;font-size:12px;color:#56645c}.ch-footer div{display:flex;flex-wrap:wrap;gap:20px}.ch-announcement{display:flex;justify-content:center;align-items:center;gap:18px;flex-wrap:wrap;padding:15px 24px;background:#d9ebc9;color:#1b382a;font-size:13px}.ch-announcement strong{border-bottom:1px solid currentColor}.ch-home-spot{padding:55px 0;background:#e8ecdf}.ch-home-spot>.wrap{display:grid;grid-template-columns:2fr 1fr;align-items:center;gap:35px}.ch-home-spot h2{font-size:48px;line-height:1.06;margin:16px 0}.ch-home-spot p{max-width:560px;margin-bottom:22px}.ch-home-number{font:100px Fraunces,serif;color:#45634d}.ch-home-number span{display:block;font:11px 'JetBrains Mono',monospace;letter-spacing:.1em}.ch-portal{min-height:70vh;padding-top:48px;padding-bottom:60px}.ch-panel{background:#f1eee6;border:1px solid #dadfd3;border-radius:18px;padding:28px;margin:24px 0}.ch-panel h2{font-size:30px}.ch-notice{border-left:3px solid #778e57;background:#eef0df;padding:16px 20px;margin:20px 0;font-size:14px;line-height:1.7}.ch-error{background:#fff0e9;border-color:#bb6049;color:#813e28}.ch-form{display:grid;gap:18px;max-width:520px}.ch-form label{display:grid;gap:7px;font-size:14px;font-weight:600}.ch-form input:not([type=checkbox]){width:100%;padding:13px 14px;border:1px solid #aab4a2;border-radius:8px;background:#fffdf8;font:16px 'Inter Tight',sans-serif;color:#172a24}.ch-form .ch-check{display:flex;align-items:flex-start;gap:10px;font-weight:400}.ch-check input{margin-top:5px;flex-shrink:0}.ch-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:25px}.ch-tabs button{background:none;border:1px solid #9ca995;padding:9px 16px;border-radius:30px;cursor:pointer;font:inherit}.ch-tabs button[aria-selected=true]{background:#18382b;color:white}.ch-status{display:inline-block;border-radius:20px;padding:7px 12px;background:#dbe8ca;font-size:12px;font-weight:600;text-transform:capitalize}.ch-status.pending{background:#efe4c7}.ch-status.rejected{background:#f2d9d0}.ch-table-wrap{overflow:auto;border:1px solid #d4dccd;border-radius:14px}.ch-table{border-collapse:collapse;width:100%;min-width:420px;text-align:left;font-size:14px}.ch-table th,.ch-table td{padding:15px;border-bottom:1px solid #d4dccd}.ch-table th{font-size:11px;text-transform:uppercase;letter-spacing:.08em}.ch-table .winner{background:#e4edd8}.ch-table button{padding:7px 10px;margin:3px;font:inherit;border-radius:6px;border:1px solid #a5b39b;background:#faf7f0;cursor:pointer}.ch-exam-wrap{max-width:1360px;margin:auto;padding:30px}.ch-exam-top{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid #d4dccd;padding-bottom:20px}.ch-exam-top h1{font-size:28px;margin:8px 0}.ch-timer{font:32px 'JetBrains Mono',monospace;font-variant-numeric:tabular-nums}.ch-timer.urgent{color:#a33f25}.ch-save{font-size:12px;color:#4c644e;max-width:420px}.ch-exam-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:30px;padding-top:25px}.ch-question-nav{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:10px 0 24px}.ch-question-nav button{padding:8px 0;border:1px solid #bac4b2;background:#fcfaf5;border-radius:6px;cursor:pointer;font:13px 'Inter Tight',sans-serif}.ch-question-nav button.answered{background:#d5e9c7}.ch-question-nav button.current{outline:2px solid #18382b;outline-offset:1px}.ch-question-nav button.flagged::after{content:'•';color:#a55a28}.ch-nav-group{font-size:12px;font-weight:600;margin-top:10px}.ch-question{background:#fffdf7;border:1px solid #d5ddcb;border-radius:18px;padding:32px;min-height:420px}.ch-question h2{font-size:33px}.ch-board{display:grid;gap:10px;max-width:490px;margin:24px 0;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr))}.ch-tile{min-height:68px;padding:12px 8px;border:1px solid #a8b9ad;border-radius:12px;background:#e8eee3;color:#21372c;cursor:pointer;font:600 22px 'Inter Tight',sans-serif;position:relative}.ch-tile:hover{border-color:#42684d}.ch-tile.selected,.ch-tile.lit{background:#193e33;color:#b7efd2}.ch-tile small{display:block;font-size:11px;line-height:1.5;font-weight:500}.ch-tile .ch-step{position:absolute;right:5px;top:4px;background:#e7bd83;color:#392c15;border-radius:20px;padding:2px 6px;font-size:10px}.ch-tile:disabled{cursor:default}.ch-signal{font-size:32px}.ch-signal.Mint{color:#195d46;background:#d5ebdc}.ch-signal.Coral{color:#943d28;background:#f6d8cd}.ch-signal.Lavender{color:#583d88;background:#e7def8}.ch-signal.selected{outline:3px solid #18382b;outline-offset:2px}.ch-switch-numbers{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0}.ch-switch-numbers span{padding:12px 18px;background:#e4e9db;border-radius:9px;font-size:24px}.ch-pair-row{display:grid;grid-template-columns:60px 1fr;gap:18px;align-items:center;margin:14px 0}.ch-pair-row>strong{font-size:24px}.ch-pair-choices{display:flex;gap:8px;flex-wrap:wrap}.ch-pair-choices button{min-height:42px;font-size:16px;padding:8px 12px}.ch-answer-summary{font:13px 'JetBrains Mono',monospace;min-height:24px;color:#3f5c44;overflow-wrap:anywhere}.ch-question-footer{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:28px}.ch-progress{height:5px;background:#d9e0d1;border-radius:5px;margin:12px 0;overflow:hidden}.ch-progress i{display:block;height:100%;background:#4d7959}.ch-score{font:70px Fraunces,serif}.ch-review-row{border-bottom:1px solid #d4dccd;padding:15px 0;font-size:14px}.ch-review-row summary{cursor:pointer}.ch-body dialog{border:1px solid #b9c5af;border-radius:18px;padding:30px;max-width:500px;background:#faf7f0;color:#172a24}.ch-body dialog::backdrop{background:#14281fa0}.ch-body dialog h2{font-size:32px}.ch-body .ch-text-button{background:transparent;border:0;text-decoration:underline;cursor:pointer;color:#244933;font:inherit;padding:8px}.ch-full{grid-column:1/-1}.ch-badge-note{font:11px 'JetBrains Mono',monospace;letter-spacing:.08em;color:#596f51}
@media(max-width:950px){.ch-nav{padding:18px 24px}.ch-nav nav{gap:15px}.ch-nav nav>a:not(.ch-button){display:none}.ch-hero{gap:30px}.ch-art-grid{padding:24px 10px}.ch-exam-layout{grid-template-columns:180px minmax(0,1fr)}.ch-question{padding:22px}.ch-home-number{font-size:75px}}
@media(max-width:680px){.ch-wrap{padding-inline:20px}.ch-nav{padding:16px;gap:12px}.ch-logo{font-size:22px}.ch-logo small,.ch-nav-divider{display:none}.ch-hero{grid-template-columns:1fr;padding-top:36px;gap:30px}.ch-body h1{font-size:46px}.ch-poster{transform:none;padding:24px}.ch-art-grid{padding:24px;max-width:350px;margin:auto}.ch-date-strip{flex-wrap:wrap;justify-content:flex-start;gap:12px 24px}.ch-date-strip>span:first-child{width:100%}.ch-section{padding:45px 0}.ch-prize{grid-template-columns:1fr;padding:24px;gap:20px}.ch-prize-number{border-right:0;border-bottom:1px solid #c8d3bc;padding-bottom:15px;font-size:80px}.ch-steps,.ch-modes,.ch-rules{grid-template-columns:1fr;gap:18px}.ch-modes{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.ch-modes article{padding:18px}.ch-footer{flex-direction:column;padding:28px 20px}.ch-announcement{text-align:center;gap:6px;font-size:12px}.ch-announcement>*{width:100%}.ch-home-spot>.wrap{grid-template-columns:1fr}.ch-home-number{display:none}.ch-home-spot h2{font-size:40px}.ch-portal{padding-top:30px}.ch-exam-wrap{padding:16px}.ch-exam-layout{display:flex;flex-direction:column-reverse}.ch-exam-top{align-items:flex-start;flex-wrap:wrap}.ch-exam-top h1{font-size:23px}.ch-timer{font-size:27px}.ch-question h2{font-size:28px}.ch-question{padding:20px}.ch-exam-layout aside{border-top:1px solid #c9d3c1;padding-top:20px}.ch-question-nav{grid-template-columns:repeat(10,1fr);gap:5px}.ch-question-nav button{font-size:11px}.ch-tile{font-size:19px;min-height:60px}.ch-pair-row{grid-template-columns:42px 1fr}.ch-body dialog{max-width:calc(100% - 32px)}.ch-panel{padding:22px}.ch-actions{gap:15px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Participant guide */
.ch-guide-hero{padding:58px 0 40px;max-width:940px}.ch-guide-hero h1{font-size:clamp(42px,4.8vw,68px)}.ch-guide-facts{display:flex;flex-wrap:wrap;gap:24px 45px;margin:30px 0;padding:22px 0;border-top:1px solid #d4dccd;border-bottom:1px solid #d4dccd}.ch-guide-facts span{font-size:13px;color:#52615a}.ch-guide-facts strong{display:block;color:#172a24;font-size:18px;margin-bottom:7px}.ch-guide-layout{display:grid;grid-template-columns:225px minmax(0,1fr);gap:55px;padding-bottom:60px;align-items:start}.ch-guide-contents{position:sticky;top:25px;border:1px solid #d4dccd;border-radius:14px;padding:18px;background:#f0f1e7}.ch-guide-contents .ch-eyebrow{margin:0 0 12px}.ch-guide-contents a{display:block;font-size:13px;padding:10px 0;line-height:1.4;border-top:1px solid #d4dccd}.ch-guide-contents a:hover{text-decoration:underline;text-underline-offset:4px}.ch-guide-content{min-width:0}.ch-guide-content>section{padding:30px 0 38px;border-top:1px solid #d4dccd;scroll-margin-top:24px}.ch-guide-content>section:first-child{padding-top:0;border-top:0}.ch-guide-content h2{font-size:clamp(30px,3vw,39px)}.ch-guide-content p,.ch-guide-content li{font-size:16px;line-height:1.75}.ch-guide-content ol,.ch-guide-content ul{padding-left:24px}.ch-guide-content li{padding-left:5px;margin:12px 0}.ch-guide-content .ch-caption{font-size:13px}.ch-guide-content .ch-notice{line-height:1.75}.ch-guide-content a:not(.ch-button){text-decoration:underline;text-underline-offset:4px}.ch-guide-puzzles{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}.ch-guide-puzzles article{border:1px solid #d4dccd;border-radius:14px;background:#fffdf7;padding:23px}.ch-guide-mode{font:11px 'JetBrains Mono',monospace;letter-spacing:.08em;color:#496b53}.ch-guide-puzzles h3{font-size:24px;margin:14px 0}.ch-guide-puzzles p{font-size:15px}.ch-guide-content .ch-ranking-order{list-style-position:inside;padding:0;counter-reset:rank}.ch-ranking-order li{padding:17px 20px;background:#e7eddf;border-radius:10px;margin:10px 0}.ch-ranking-order span{display:block;font-size:14px;margin-top:5px}.ch-guide-content caption{text-align:left;padding:15px;font-size:13px;line-height:1.5}.ch-guide-content .ch-table{min-width:440px}.ch-guide-content .ch-table th{line-height:1.5}.ch-guide-content .ch-table td{vertical-align:top;line-height:1.6}.ch-guide-content #ranking .ch-table{min-width:620px}.ch-guide-content .ch-table-wrap:focus-visible{outline:3px solid #5782cb;outline-offset:4px}
@media(max-width:950px){.ch-guide-layout{grid-template-columns:1fr;gap:30px}.ch-guide-contents{position:static}.ch-guide-contents nav{display:grid;grid-template-columns:1fr 1fr;column-gap:24px}.ch-guide-contents .ch-eyebrow{grid-column:1/-1}.ch-guide-hero{padding-top:38px}}
@media(max-width:680px){.ch-guide-puzzles{grid-template-columns:1fr}.ch-guide-puzzles article{padding:20px}.ch-guide-facts{gap:20px 28px}.ch-guide-facts span:last-child{width:100%}.ch-guide-contents nav{column-gap:15px}.ch-guide-contents a{font-size:12px}.ch-guide-content>section{padding-bottom:28px}.ch-guide-hero h1{font-size:43px}.ch-guide-content .ch-actions{align-items:flex-start;flex-direction:column}}
@media print{.ch-guide-contents,.ch-guide .ch-actions,.ch-guide~.ch-footer,.ch-body:has(.ch-guide) .ch-nav,.ch-body:has(.ch-guide) .ee-skip{display:none}.ch-guide-layout{display:block}.ch-guide{max-width:none;padding:0}.ch-guide-hero{padding:0 0 20px}.ch-guide-hero h1{font-size:36px}.ch-guide-content h2{font-size:25px}.ch-guide-content p,.ch-guide-content li{font-size:11pt}.ch-guide-puzzles{display:block}.ch-guide-puzzles article{break-inside:avoid;margin-bottom:15px}.ch-guide-content .ch-table-wrap{overflow:visible}.ch-guide-content .ch-table,.ch-guide-content #ranking .ch-table{min-width:0}.ch-guide-content th,.ch-guide-content td{padding:8px}.ch-guide-content h2,.ch-guide-content h3{break-after:avoid}}