:root{--ink:#10223b;--navy:#111d35;--teal:#007e8e;--blue:#275cbd;--orange:#e87f39;--violet:#6952a1;--line:#d9e3ec;--muted:#5d6c81;--bg:#f6f9fb;--shadow:0 12px 45px #132c5111}
*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{margin:0;font:16px/1.5 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{color:inherit}button,input{font:inherit}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:19px max(24px,calc((100vw - 1080px)/2));background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:15px;letter-spacing:.12em;font-weight:850}.brand small{display:block;letter-spacing:.04em;color:#758398;font-size:11px;font-weight:500}.brand-mark{display:grid;place-items:center;width:41px;height:41px;border-radius:11px;background:#112344;color:#77f0de;font-family:Georgia,serif;font-size:29px}.topbar nav{display:flex;gap:24px}.topbar nav a{text-decoration:none;font-weight:600;font-size:13px;color:#52647c}.topbar nav a:hover,.backlink:hover{color:var(--blue)}.shell{max-width:1080px;margin:0 auto;padding:38px 24px 72px}.hero{display:flex;justify-content:space-between;align-items:center;gap:32px;border-radius:22px;padding:36px 42px;background:linear-gradient(112deg,#101c34,#1a3454);color:#fff;min-height:230px;overflow:hidden}.hero h1{font-size:clamp(31px,4vw,51px);line-height:1.1;margin:10px 0 14px;letter-spacing:-.035em}.hero p:not(.eyebrow){max-width:580px;margin:0;color:#cbd6e2}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.18em;color:var(--teal);margin:0;text-transform:uppercase}.hero .eyebrow{color:#78dcd1}.hero-icon{font-size:clamp(100px,15vw,185px);color:#7bdcd840;line-height:.8;font-family:Georgia,serif;position:relative}.hero-icon span{font:800 26px/1 Inter,sans-serif;position:absolute;top:43%;left:37%;color:#fff}.identity,.progress-box,.challenge-card,.puzzle-body,.submit-area,.panel{background:#fff;border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow)}.identity{padding:27px 30px;margin:27px 0 18px}.identity h2{font-size:21px;margin:0 0 5px}.identity p{color:var(--muted);margin:0 0 17px}.join-grid{display:grid;grid-template-columns:1fr 1fr auto;gap:14px;align-items:end}.join-grid label,.login-row label{font-size:12px;font-weight:800;letter-spacing:.02em;display:flex;flex-direction:column;gap:7px}.join-grid input,input[type=text],input[type=password],input[type=number]{width:100%;padding:12px 13px;border-radius:9px;border:1px solid #bbcbd9;background:#fff;color:var(--ink);outline:none}.join-grid input:focus,input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #245cbd22}.btn{border:1px solid transparent;display:inline-flex;justify-content:center;align-items:center;gap:12px;padding:12px 17px;border-radius:10px;font-weight:750;text-decoration:none;cursor:pointer;transition:transform .12s,background .12s}.btn:hover{transform:translateY(-1px)}.btn:disabled{cursor:not-allowed;opacity:.55}.primary{color:#fff;background:var(--navy)}.primary:hover{background:#24456a}.outline{color:var(--navy);border:1px solid #bfccda;background:#fff}.ghost{color:var(--ink);background:#eff4f7;border-color:#e0e7ed}.big{font-size:16px;min-width:260px}.fineprint{font-size:12px;color:#728198!important;margin:12px 0 0!important}.ready{display:flex;justify-content:space-between;align-items:center;gap:12px}.ready-icon{display:inline-grid;place-items:center;width:25px;height:25px;border-radius:50%;background:#d2f4e9;color:#006c57;margin-right:6px;font-weight:900}.text-button{background:none;color:#335e90;border:0;text-decoration:underline;cursor:pointer;font-size:13px;font-weight:650}.muted{color:var(--muted)}.alert{padding:13px 17px;background:#fff5ec;border:1px solid #ffcca0;border-radius:10px;margin:12px 0;color:#8e4c1b}.progress-box{padding:20px 25px;margin:18px 0 34px}.progress-line{display:flex;justify-content:space-between;font-size:12px;letter-spacing:.06em}.progress-track{background:#e9eff4;height:10px;border-radius:50px;overflow:hidden;margin-top:12px}.progress-track>div{width:0;height:100%;background:linear-gradient(90deg,#19b59b,#2a86b8);border-radius:50px;transition:width .4s}.section-head{display:flex;justify-content:space-between;align-items:center;margin:0 0 18px;gap:16px}.section-head h2{font-size:23px;margin:0}.section-head span{font-size:13px}.challenge-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.challenge-card{padding:26px;display:flex;flex-direction:column;gap:8px;text-decoration:none;transition:border-color .15s,transform .15s}.challenge-card:hover{border-color:#8fafc8;transform:translateY(-2px)}.challenge-card .kicker{display:flex;align-items:center;justify-content:space-between;font-size:11px;letter-spacing:.15em;font-weight:850}.challenge-card .orb{width:50px;height:50px;margin:12px 0 5px;background:#eaf2f8;border-radius:13px;display:grid;place-items:center;font-size:26px}.challenge-card h3{font-size:23px;line-height:1.1;margin:0}.challenge-card p{font-size:14px;color:var(--muted);min-height:47px;margin:4px 0}.challenge-card .enter{margin-top:auto;align-self:flex-start;font-weight:800;font-size:13px}.solved-tag{color:#006e58;font-size:11px}.backlink{font-size:13px;font-weight:750;text-decoration:none;color:#3a659a}.puzzle-heading{display:flex;justify-content:space-between;gap:24px;align-items:end;margin:18px 0 20px}.puzzle-heading h2{font-size:clamp(30px,4vw,46px);line-height:1.12;margin:8px 0}.puzzle-heading p.muted{margin:4px 0 0;max-width:620px}.puzzle-status{white-space:nowrap;border:1px solid #dce4eb;background:#f0f4f8;border-radius:22px;padding:8px 11px;font-size:10px;font-weight:850;letter-spacing:.08em}.puzzle-status.solved{background:#daf5ec;border-color:#aee0cb;color:#12684c}.puzzle-body{padding:32px;min-height:360px}.challenge-prompt{margin:0 0 17px;font-size:16px;font-weight:700}.submit-area{padding:22px 28px;margin:18px 0}.submit-area .fineprint{margin:10px 0!important}.feedback{padding:16px;border-radius:11px;margin-top:17px;border:1px solid #f0cda5;background:#fff6ec;color:#82521d;font-weight:650}.feedback.success{border-color:#a1e2cc;background:#e7fbf2;color:#11694f}.next-nav{display:flex;justify-content:space-between;gap:12px;margin-top:15px}.seven-line #matchDrawing{width:100%;display:flex;justify-content:center}.match-hit{cursor:pointer}.seven-line{display:flex;flex-direction:column;gap:14px;align-items:center}.equation-svg{width:min(100%,680px);height:auto;touch-action:manipulation;max-height:265px}.match-line{cursor:pointer;transition:stroke .15s;stroke-linecap:round}.match-line.on{stroke:#153653}.match-line.off{stroke:#e1e9ed}.match-line.active{stroke:var(--orange)}.match-line:hover{stroke:#e59156}.note{background:#f2f6f9;border-radius:11px;padding:13px 18px;font-size:13px;color:#5e7186}.center{text-align:center}.code-rows{max-width:655px;margin:0 auto 18px}.code-clue{display:grid;grid-template-columns:145px 1fr;align-items:center;gap:16px;border-bottom:1px solid #e2eaf0;padding:13px 5px}.code-digits{display:flex;gap:6px}.code-digits span{background:#132b47;color:#fff;border-radius:8px;padding:9px 12px;font-weight:850;font-size:23px;min-width:40px;text-align:center}.code-clue p{font-size:14px;margin:0}.code-input{display:block;margin:20px auto 4px;text-align:center;max-width:208px;font-size:36px!important;letter-spacing:.3em;font-weight:850}.jug-grid{display:flex;justify-content:center;gap:40px;align-items:end;margin:26px 0}.jug{position:relative;width:150px;height:200px;border:6px solid #153653;border-top:0;border-radius:4px 4px 20px 20px;overflow:hidden}.jug::before{content:"";position:absolute;top:0;left:0;right:0;border-top:3px dashed #c4d3e1}.water{position:absolute;bottom:0;width:100%;background:linear-gradient(#74cfe5,#2a88be);height:0;transition:height .2s}.jug-volume{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:29px;font-weight:850;z-index:1;text-shadow:0 1px #fff9}.jug-caption{text-align:center;font-size:13px;font-weight:700;margin-top:9px}.jug-buttons{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:18px auto}.jug-buttons button{min-width:130px}.history{max-width:690px;margin:12px auto;font-size:13px;color:var(--muted)}.nine-svg{width:min(100%,500px);display:block;margin:0 auto;aspect-ratio:1;border-radius:14px;background:#f6f9fc;touch-action:manipulation;cursor:crosshair}.dot{fill:#173956}.path-line{stroke:#e87f39;stroke-width:6;stroke-linecap:round}.endpoint{fill:#e87f39}.exercise-toolbar{display:flex;justify-content:center;gap:10px;margin:15px auto;flex-wrap:wrap}.instructions{color:var(--muted);text-align:center;font-size:13px;margin:5px 0 13px}footer{padding:20px max(24px,calc((100vw - 1080px)/2));display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);font-size:11px;letter-spacing:.12em;color:#75859a}footer a{font-size:12px;letter-spacing:0}.panel{padding:28px;margin:20px 0}.admin-table{border-collapse:collapse;width:100%;min-width:680px}.admin-table th,.admin-table td{text-align:left;padding:12px;border-bottom:1px solid var(--line);font-size:13px}.admin-table th{font-size:11px;letter-spacing:.08em;color:#5b6d83}.table-scroll{overflow-x:auto}.login-row{display:flex;gap:12px;align-items:end;flex-wrap:wrap}.login-row label{flex:1;min-width:250px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.stat{background:#f1f6fa;padding:17px;border-radius:11px}.stat strong{display:block;font-size:28px}.stat small{color:#61738a}.status-good{font-weight:800;color:#168367}.status-wait{color:#a7b5c2}.qr-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.qr-card{padding:22px;border:1px solid var(--line);border-radius:15px;background:white;display:grid;grid-template-columns:1fr 155px;gap:14px;align-items:center}.qr-graphic svg{width:150px;height:150px;max-width:100%}.qr-card h3{margin:5px 0;font-size:21px}.qr-card p{margin:4px 0;font-size:13px;color:#6a7b8e}.qr-url{font-size:10px!important;overflow-wrap:anywhere}.print-tools{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}.qr-card .challenge-num{font-size:11px;color:#007e8e;font-weight:800;letter-spacing:.12em}button:focus-visible,a:focus-visible{outline:3px solid #3aa9ca;outline-offset:2px}
@media(max-width:760px){.topbar{padding:15px 19px}.topbar nav{gap:12px}.topbar nav a{font-size:12px}.shell{padding:23px 15px 50px}.hero{padding:27px}.hero-icon{display:none}.join-grid{grid-template-columns:1fr}.identity{padding:20px}.challenge-grid,.qr-grid{grid-template-columns:1fr}.puzzle-body{padding:20px 12px}.puzzle-heading{display:block}.puzzle-status{display:inline-block;margin-top:12px}.code-clue{grid-template-columns:122px 1fr;gap:9px}.code-digits span{padding:7px;font-size:19px;min-width:34px}.code-clue p{font-size:12px}.jug-grid{gap:25px}.jug{width:115px;height:155px}.stat strong{font-size:22px}.stats{grid-template-columns:repeat(2,1fr)}.qr-card{grid-template-columns:1fr 145px}.section-head{align-items:start;flex-direction:column}.ready{align-items:flex-start;flex-direction:column}}
@media print{.topbar,footer,.print-tools,.screen-only{display:none!important}body{background:#fff}.shell{max-width:none;padding:0}.hero{border-radius:0;margin:0 0 14px;padding:16px 23px;min-height:0}.hero h1{font-size:26px}.hero p:not(.eyebrow){display:none}.qr-grid{display:block}.qr-card{break-inside:avoid;border:2px solid #213c55;margin:0 0 11px;padding:18px 30px;min-height:180px;grid-template-columns:1fr 190px}.qr-graphic svg{width:170px;height:170px}.qr-card h3{font-size:25px}.qr-url{font-size:11px!important}}