:root{color-scheme:dark;--bg:#090e1b;--panel:#121c31;--line:#334761;--green:#85ffe0;--cream:#f1f6ff;--dim:#b2c0d5;--blue:#92c6ff;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(ellipse at 70% -10%,#223153 0,transparent 45%),var(--bg);color:var(--cream);font-size:15px;line-height:1.6}
button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.42;cursor:not-allowed}a{color:#91f0de}a:hover{color:white}
:focus-visible{outline:3px solid var(--green);outline-offset:3px}
[hidden]{display:none!important}
.skip{position:absolute;left:-9999px;top:5px;z-index:100;background:white;color:black;padding:8px}.skip:focus{left:10px}
.nav{max-width:1440px;display:flex;align-items:center;justify-content:space-between;gap:25px;flex-wrap:wrap;margin:0 auto;padding:24px 4%;border-bottom:1px solid var(--line)}
.nav .logo{text-decoration:none;font-size:19px;font-weight:950;letter-spacing:.08em;color:#fff}.logo em{color:var(--green);font-style:normal}.nav nav{display:flex;gap:19px;flex-wrap:wrap}.nav nav a{text-decoration:none;color:#c7dcf0;font-size:12px;font-weight:700}
main{max-width:1440px;margin:0 auto;padding:0 4%}
.eyebrow{color:var(--green);font-size:10px;letter-spacing:.2em;font-weight:900;text-transform:uppercase}
.hero{padding:65px 0 48px}.hero h1{font-size:clamp(40px,6.5vw,87px);letter-spacing:-.065em;line-height:1.02;margin:20px 0 20px;font-weight:950;max-width:1000px}
.hero h1 span{color:var(--green)}.hero>p{max-width:900px;font-size:18px;color:var(--dim)}
.mode-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:35px 0}
.mode-grid article{background:linear-gradient(140deg,#192640,#111b30);border:1px solid var(--line);border-radius:13px;padding:18px}
.mode-grid article strong{color:#b8ffe9;letter-spacing:.12em;font-size:11px}.mode-grid article p{color:var(--dim);font-size:13px;margin:13px 0}
.mode-grid article a{font-size:11px;font-weight:900;text-decoration:none}
.honesty{font-size:13px!important;background:#141d31;border-left:4px solid #79d5d0;padding:14px 20px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin:30px 0}
.section-head h2{font-size:clamp(27px,4.5vw,46px);letter-spacing:-.04em;margin:7px 0 0}
.progress{border:1px solid #306e68;border-radius:13px;background:#102a32;padding:14px 22px;min-width:220px;text-align:right}
.progress span,.progress small{display:block;font-size:9px;font-weight:850;letter-spacing:.09em;color:#a8d7d0}
.progress strong{display:block;font-size:40px;letter-spacing:-.06em;line-height:1.1;color:#93fdeb}
.layout{display:grid;grid-template-columns:235px minmax(0,1fr);gap:16px}
.world-list,.session{border:1px solid var(--line);border-radius:15px;background:#101a2d}
.world-list{padding:16px;align-self:start;position:sticky;top:14px}
.world-list h3{font-size:11px;letter-spacing:.14em;color:#a9c2d7}
#world-buttons{display:flex;flex-direction:column;gap:7px}
.world-button{width:100%;background:#18273e;border:1px solid #3b526b;color:#d4e8f6;padding:12px;border-radius:8px;text-align:left;display:flex;align-items:center;gap:10px;font-size:12px;font-weight:800}
.world-button span{width:26px;color:var(--green);font-size:20px;text-align:center}.world-button.active{background:#1f4850;border-color:#71e8d7}
.world-button small{display:block;font-weight:450;color:#aac0ce}
.world-list p{font-size:11px;color:#91a5bc;margin-top:25px}.reset{margin-top:20px;background:transparent;border:1px solid #5c6c84;border-radius:8px;color:#a7bfd8;padding:10px;font-size:11px;font-weight:800;width:100%}
.session{min-width:0;padding:28px}.session-top{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.stages{display:flex;gap:6px;flex-wrap:wrap}
.stage-button{min-width:37px;height:38px;border:1px solid #40516c;background:#17243b;color:#bcd3ef;border-radius:8px;font-size:12px;font-weight:900}
.stage-button.active{background:#7ce6d4;color:#062627}.stage-button.done{border-color:#82f6db}
.session>h2{font-size:clamp(27px,4vw,50px);letter-spacing:-.045em;margin:24px 0 13px;line-height:1.05}
.story{color:#d6e2f3;font-size:16px;line-height:1.75;max-width:860px}
.directions{background:#162842;border-left:3px solid #86e9d9;padding:12px 16px;color:#c8dff2;font-size:13px;border-radius:5px;margin:22px 0}
.challenge-surface{border:1px solid #3b5375;border-radius:13px;background:#0b152a;padding:20px;overflow:hidden}
.challenge-status{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;border-bottom:1px solid #293e57;padding-bottom:15px;font-size:11px;letter-spacing:.08em}
.challenge-status small{color:#88dcca;font-size:10px}.challenge-status strong{color:#dbeeff}
#challenge-panel{padding-top:19px;min-height:200px}
button.btn{border-radius:9px;padding:12px 16px;border:1px solid transparent;font-size:11px;font-weight:850;letter-spacing:.06em;background:#1b3046;color:#e1f8ff}
button.btn.primary{background:var(--green);color:#07252b}
button.btn.ghost{border-color:#475c78}
button.btn:hover:not(:disabled){filter:brightness(1.13)}
.actionbar{display:flex;gap:9px;flex-wrap:wrap;margin:15px 0}
.feedback{padding:13px 17px;border-radius:8px;background:#142036;border:1px solid #415873;color:#c1d8ee;font-size:13px;margin:15px 0}
.feedback.win{background:#163e39;color:#a4ffdc;border-color:#51be9c}
.feedback.error{background:#3c2134;color:#ffbed1;border-color:#8f5a75}
.solution{padding:15px 18px;white-space:pre-wrap;overflow-wrap:anywhere;border:1px solid #a08aba;background:#25213e;border-radius:10px;color:#e7dfff;font-size:12px}
.lesson{background:#151e31;border:1px solid #2a425c;border-radius:12px;padding:22px;margin-top:23px}.lesson h3{font-size:23px;margin:10px 0}
.lesson p{font-size:13px;color:#b6cce0;margin:0}
.lesson-unlocked{margin-top:16px;background:#183b32;padding:14px;border-radius:8px;color:#a3fae2;font-size:13px}
.challenge-image{width:min(100%,580px);height:auto;border:1px solid #3d5575;border-radius:9px;display:block;margin:15px 0}
.board-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:4px;max-width:440px;margin:14px 0}
.cell{aspect-ratio:1;background:#21344b;display:grid;place-items:center;font-weight:900;border-radius:5px;color:#bedbea;border:1px solid #34536c;font-size:clamp(12px,2.5vw,24px)}
.cell.wall{background:#0c1426;color:#51657f}.cell.key{color:#68efd5;background:#1a3e42}.cell.exit{color:#ccb9ff}.cell.player{color:#061e29;background:#7bf3da}
.move-controls{display:flex;gap:7px;flex-wrap:wrap;margin:15px 0}.move-controls button{background:#20455a;color:#b8fff0;border:1px solid #4e8e96;border-radius:8px;padding:9px 16px;font-weight:900}
.field{display:flex;flex-direction:column;gap:7px;margin:13px 0;max-width:570px}
.field label{font-size:12px;color:#b0d6e3;font-weight:800}
.field input,.field select{background:#0b182d;border:1px solid #5c7897;border-radius:8px;color:#effaff;padding:11px;font-size:15px;max-width:100%;width:100%}
.field small{font-size:11px;color:#9dbbd0}
.inline-fields{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:620px}
.inline-fields input{text-align:center;font-size:25px;font-weight:800}
.panel-note{color:#a6c1d7;font-size:12px}
.state-output{background:#0b1b2b;padding:13px;border-radius:8px;border:1px solid #2f4e5d;white-space:pre-wrap;overflow-wrap:anywhere;color:#b7f0dd;font-size:12px;line-height:1.7}
.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0;max-width:700px}
.choice{padding:13px;color:#daeaff;border:1px solid #4d5c7a;border-radius:10px;background:#202944;text-align:left;font-size:14px}
.choice:hover{background:#2a4652}
.circuit-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;max-width:490px}
.pipe{background:#1c3147;border:1px solid #45617c;color:#d5f8ee;border-radius:8px;min-height:77px;display:flex;justify-content:center;align-items:center;flex-direction:column;padding:6px;line-height:1.3}
.pipe.pwr{background:#144c43;border-color:#79f0d2}.pipe strong{font-size:12px}.pipe small{font-size:10px;letter-spacing:.06em;text-align:center}
.reader-zone{padding:70px 0}.reader-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
.reader-card{padding:25px;background:#111c2f;border:1px solid var(--line);border-radius:15px}
.reader-card h3{font-size:23px;margin:0 0 6px}.reader-card p{font-size:13px;color:#b4c7dc}
.reader-card textarea{width:100%;resize:vertical;background:#07101e;color:#d8eff4;border:1px solid #3c5d77;border-radius:10px;padding:13px;font:12px/1.65 ui-monospace,monospace;margin:8px 0}
.contract-line{display:flex;gap:12px;flex-wrap:wrap;margin-top:19px}
.contract-line a{font-size:12px;color:#80e9d0;text-decoration:none;font-weight:800;padding:9px 12px;border:1px solid #3a6768;border-radius:8px}
.why{border-top:1px solid var(--line);padding:55px 0 85px}.why h2{font-size:clamp(34px,5vw,67px);letter-spacing:-.06em;line-height:1.04;margin:20px 0}.why p{max-width:780px;color:#bbcde0}
footer{max-width:1440px;margin:auto;border-top:1px solid var(--line);padding:24px 4%;display:flex;gap:15px;justify-content:space-between;flex-wrap:wrap;font-size:10px;letter-spacing:.08em;color:#9cadc4}
@media(max-width:1000px){.mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.layout{grid-template-columns:1fr}.world-list{position:static}.world-list #world-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:690px){main{padding:0 15px}.nav{padding:17px 15px}.hero{padding:34px 0}.hero>p{font-size:15px}.mode-grid,.reader-grid{grid-template-columns:1fr}.section-head{align-items:stretch;flex-direction:column}.progress{text-align:left}.session{padding:16px}.world-list #world-buttons{grid-template-columns:1fr}.inline-fields{grid-template-columns:repeat(3,minmax(0,1fr))}.choice-grid{grid-template-columns:1fr}.cell{font-size:15px}.circuit-grid .pipe{min-height:61px}.nav nav{gap:10px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}