*{box-sizing:border-box}html{height:100%}body{margin:0;min-height:100%;background:#080d25;color:#e8efff;font-family:'Trebuchet MS',Verdana,sans-serif;overflow-x:hidden}button{font:inherit;cursor:pointer}button:focus-visible{outline:3px solid #ffdc70;outline-offset:3px}.ambient{position:fixed;pointer-events:none;filter:blur(45px);opacity:.22;z-index:-1}.ambient-one{width:550px;height:550px;background:#d32d94;top:-280px;left:-120px}.ambient-two{width:650px;height:650px;background:#1fc9d6;bottom:-390px;right:-180px}.page-shell{width:min(1520px,calc(100% - 64px));margin:0 auto}.site-header{display:flex;align-items:center;padding:29px 4px 25px;gap:20px}.brandmark{position:relative;width:76px;height:66px;flex:none;background:#10193b;border:2px solid #5cf9e7;box-shadow:6px 6px 0 #2f1c57,inset 0 0 20px #0bc4b328;display:flex;align-items:center;justify-content:center;transform:skew(-7deg)}.brandmark span{font-size:39px;color:#ff6cb0;font-weight:900;line-height:1;position:absolute;left:8px;top:5px}.brandmark span+span{left:25px;top:19px;color:#5cf9e7}.brand-copy{min-width:0}.eyebrow,.panel-kicker,.side-heading,.stat-label,.site-header .header-stamp,.page-footer,.side-mini-title{font-family:'Courier New',monospace;font-weight:bold;letter-spacing:2px}.eyebrow{margin:0 0 2px;color:#71f4de;font-size:11px}.spark{color:#fd6bad}.site-header h1{margin:0;color:#fff;font-family:Impact,'Arial Black',sans-serif;line-height:.95;font-size:clamp(35px,4.35vw,67px);letter-spacing:2px;text-shadow:4px 4px 0 #31316c}.site-header h1 em{font-style:normal;color:#fd5fa9}.site-header h1 sup{font-size:.44em;vertical-align:top;padding-left:3px;color:#ffdb78}.header-stamp{margin-left:auto;border:2px solid #6b79a4;color:#8ea7c8;font-size:10px;text-align:center;padding:10px 13px;line-height:1.6;transform:rotate(3deg)}.header-stamp b{font-size:14px;color:#ffdb78;letter-spacing:1px}.header-stamp span{display:block;color:#fb6fa9;letter-spacing:6px}.main-grid{display:grid;grid-template-columns:minmax(0,1fr) 284px;gap:20px;align-items:start}.cabinet{min-width:0;border:3px solid #4b5688;background:#101b3a;box-shadow:0 0 0 5px #141c39,0 22px 60px #0007,12px 12px 0 #100e2c}.cabinet-header{height:82px;display:flex;align-items:center;justify-content:space-around;gap:14px;padding:10px 20px;background:linear-gradient(180deg,#20244d,#0e1734);border-bottom:2px solid #5064a0}.stat{min-width:0;display:flex;flex-direction:column;gap:3px}.stat-label{font-size:10px;color:#97a5cd}.stat strong{font-size:23px;line-height:1.1;color:#f5f7ff}.stat:first-child strong{color:#73fbea}.stat:nth-child(2) strong{color:#ffda70}.hearts{color:#ff639f!important;font-size:20px!important;white-space:nowrap}.tabular{font-variant-numeric:tabular-nums;font-family:'Courier New',monospace;font-weight:900}.icon-button{flex:none;background:#1d2b50;border:1px solid #526391;color:#ffdd82;border-radius:5px;padding:11px 10px;font-size:16px;min-width:43px}.icon-button:hover{background:#314470}.icon-button span{font:10px 'Courier New',monospace;font-weight:bold}.progress-track{height:5px;background:#28345c}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,#59e6db,#ff75b9);box-shadow:0 0 12px #67f0d5;transition:width .2s linear}.game-viewport{position:relative;background:#050e21;overflow:hidden;aspect-ratio:11/6;isolation:isolate}.game-viewport canvas{display:block;width:100%;height:100%;touch-action:manipulation}.crt-overlay{position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(180deg,transparent 0,transparent 3px,#04061225 4px);mix-blend-mode:multiply;z-index:2}.game-viewport:after{content:'';position:absolute;inset:0;pointer-events:none;box-shadow:inset 0 0 75px #02040e88;z-index:2}.screen-overlay{position:absolute;z-index:4;inset:0;display:none;align-items:center;justify-content:center;background:#030821a3;backdrop-filter:blur(4px);padding:20px}.screen-overlay.active{display:flex}.overlay-card{max-width:620px;width:100%;background:linear-gradient(145deg,#162551f5,#101936f7);border:2px solid #5f78b9;box-shadow:0 0 0 6px #060c28aa,0 15px 60px #000b,inset 0 0 45px #4b47a622;text-align:center;padding:25px 36px 27px;position:relative}.overlay-card:before,.overlay-card:after{content:'';position:absolute;width:13px;height:13px;border:3px solid #59eed8}.overlay-card:before{left:9px;top:9px;border-right:0;border-bottom:0}.overlay-card:after{right:9px;bottom:9px;border-left:0;border-top:0}.panel-kicker{font-size:11px;color:#ffda78}.pixel-glyph{font:900 46px Georgia,serif;color:#66f7dd;text-shadow:0 0 22px #50c7b8;margin:5px 0 -1px}.pixel-glyph span{color:#fff0a6;font-size:32px;vertical-align:7px}.overlay-card h2{font:900 clamp(27px,3vw,43px) Impact,'Arial Black',sans-serif;letter-spacing:2px;margin:9px 0;color:#fff;text-shadow:3px 3px 0 #49336e}.overlay-card h2 span{color:#ff6aac}.overlay-card p{font-size:15px;line-height:1.55;color:#c2d1ef;max-width:470px;margin:12px auto}.overlay-card p b{color:#fff}.rule-pills{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin:20px 0}.rule-pills span{background:#164a58;border:1px solid #3a8d92;color:#a8ffee;font:700 12px 'Courier New',monospace;padding:8px 10px}.rule-pills span+span{background:#4e204a;border-color:#984978;color:#ffc0dd}.primary-button{border:0;min-width:230px;background:#f968ab;color:#100e25;font:900 20px Impact,'Arial Black',sans-serif;letter-spacing:2px;padding:14px 26px;box-shadow:5px 5px 0 #a92776;transition:transform .12s,box-shadow .12s}.primary-button:hover{background:#ff88c0;transform:translate(2px,2px);box-shadow:3px 3px 0 #a92776}.primary-button span{font-size:.8em;margin-left:12px}.overlay-card small{display:block;margin-top:19px;color:#8c9fbf;font:700 10px 'Courier New',monospace;letter-spacing:1px}.quiz-card{max-width:590px}.quiz-header{display:flex;justify-content:center;align-items:center;gap:15px;margin:13px 0 21px}.quiz-icon{width:64px;height:64px;border:4px solid #f9cb69;color:#f9cb69;font:900 43px Impact,sans-serif;display:flex;align-items:center;justify-content:center;transform:rotate(-8deg);background:#3c2c54}.quiz-header h2{margin:0;text-align:left}.quiz-bonus{display:block;font:700 11px 'Courier New',monospace;color:#69eedd;text-align:left;letter-spacing:1px}.tf-tag{display:inline-block;background:#ffce74;color:#211836;font:bold 11px 'Courier New',monospace;letter-spacing:2px;padding:7px 12px}.quiz-question{font-size:21px!important;font-weight:bold;line-height:1.4!important;color:#fff!important;min-height:64px}.quiz-actions{display:flex;gap:13px;margin-top:20px}.quiz-answer{width:50%;padding:15px;border:2px solid #65efdc;background:#123b50;color:#8cfff0;font:900 22px Impact,sans-serif;letter-spacing:2px}.quiz-answer+button{border-color:#ff72ab;background:#472340;color:#ffb9d8}.quiz-answer:hover{filter:brightness(1.3)}.quiz-answer:disabled{opacity:.5;cursor:default}.quiz-answer span{float:right}.quiz-feedback{font-weight:bold;color:#ffca87!important;min-height:25px}.quiz-feedback.success{color:#6ff8d7!important}.continue-button{min-width:190px;padding:11px}.compact-card{max-width:460px}.compact-card h2{font-size:56px}.end-score{display:flex;align-items:center;justify-content:space-between;margin:19px auto 25px;max-width:280px;color:#9fb4d5;font:700 12px 'Courier New',monospace}.end-score strong{font-size:27px;color:#75f6e1}.cabinet-footer{min-height:57px;background:linear-gradient(180deg,#1d2b55,#161f43);border-top:2px solid #596b9f;display:flex;align-items:center;gap:12px;padding:10px 18px;color:#a8bbd8;font:700 11px 'Courier New',monospace;letter-spacing:1px}.marquee-dot{width:9px;height:9px;background:#60ecd6;border-radius:50%;box-shadow:0 0 14px #60ecd6;flex:none;animation:blink 1.2s infinite}.machine-id{margin-left:auto;color:#64759e;white-space:nowrap}.mobile-controls{display:none}.sidebar{display:flex;flex-direction:column;gap:17px}.lesson-card,.how-card{background:linear-gradient(155deg,#1b2650,#121b3b);border:2px solid #394873;box-shadow:7px 7px 0 #0c1230;padding:20px}.side-heading{display:flex;justify-content:space-between;color:#7cf1dd;font-size:10px}.mini-star{font-size:20px;color:#ffd474}.lesson-card h3{margin:18px 0 12px;color:#f7f8ff;font:900 31px/1 Impact,'Arial Black',sans-serif;letter-spacing:1px}.lesson-card h3 em{font-style:normal;color:#fe7bb7}.lesson-card>p{font-size:13px;color:#b3c2df;line-height:1.55}.legend-row{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid #39466c}.legend-symbol{flex:none;width:41px;height:40px;background:#25355e;color:#70f8e4;display:flex;align-items:center;justify-content:center;font-size:30px;border:1px solid #49658c}.legend-row strong{font:700 11px 'Courier New',monospace;color:#eaf5ff}.legend-row small{display:block;color:#91a7c9;font-size:11px;margin-top:2px}.tick-symbol{position:relative;gap:4px;transform:none}.tick-symbol:before{content:'';position:absolute;height:2px;background:#65f8dd;width:27px;transform:rotate(-25deg)}.tick-symbol span{height:15px;width:2px;background:#fff1ab;transform:rotate(-25deg);z-index:1}.arc-symbol{font-family:Georgia,serif}.square-symbol{font-size:33px}.divider{border-top:1px dashed #506187;margin:20px 0 14px}.side-mini-title{font-size:10px;color:#72f4de!important;margin:0 0 9px!important}.theorem-chips{display:flex;flex-wrap:wrap;gap:5px;margin:0 0 16px}.theorem-chips span{font:900 12px 'Courier New',monospace;color:#b7fff0;background:#185463;border:1px solid #3b8f94;padding:8px 9px}.warning-title{color:#ff8db9!important}.trap-chips span{background:#4b264d;color:#ffd0e3;border-color:#a04f83}.how-card{padding:18px 20px}.how-card .side-heading{margin-bottom:13px}.control-key-row{display:flex;align-items:center;justify-content:space-between;padding:6px 0;font-size:12px;color:#adc1dd}.keys{display:flex;gap:4px}kbd{min-width:25px;height:26px;display:inline-flex;align-items:center;justify-content:center;border:1px solid #7486ae;border-bottom:3px solid #6677a8;background:#293860;color:#fff;border-radius:3px;font:700 13px 'Courier New',monospace}.sidebar-note{margin:14px 0 0;padding-top:14px;border-top:1px solid #425178;color:#889fc5;font-size:12px;line-height:1.45}.page-footer{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:23px 2px;color:#7484a9;font-size:9px}.page-footer b{color:#d6fbe9}@keyframes blink{50%{opacity:.25}}[hidden]{display:none!important}
@media(max-width:1180px){.page-shell{width:min(1100px,calc(100% - 36px))}.main-grid{grid-template-columns:minmax(0,1fr)}.sidebar{display:grid;grid-template-columns:1fr 1fr}.lesson-card{display:grid;grid-template-columns:1fr 1fr;column-gap:20px}.lesson-card .side-heading,.lesson-card h3,.lesson-card>p,.legend-row{grid-column:1}.lesson-card .divider,.lesson-card .side-mini-title,.lesson-card .theorem-chips{grid-column:2}.lesson-card .divider{grid-row:2;margin:0 0 10px}.lesson-card .side-mini-title:nth-of-type(2){grid-row:3}.lesson-card .theorem-chips{align-self:start}.lesson-card .legend-row{max-width:350px}.lesson-card .warning-title{margin-top:0!important}.page-footer{flex-wrap:wrap}}
@media(max-width:700px){.page-shell{width:100%}.site-header{padding:18px 18px 15px;gap:13px}.brandmark{width:47px;height:46px;box-shadow:3px 3px 0 #2f1c57}.brandmark span{font-size:26px;left:3px;top:3px}.brandmark span+span{left:14px;top:12px}.eyebrow{font-size:8px;letter-spacing:1px}.site-header h1{font-size:clamp(29px,7.4vw,48px)}.header-stamp{display:none}.main-grid{display:block}.cabinet{border-left:0;border-right:0;box-shadow:none}.cabinet-header{height:64px;gap:5px;padding:8px}.stat-label{font-size:8px;letter-spacing:1px}.stat strong{font-size:16px}.hearts{font-size:14px!important}.timer-stat strong{font-size:16px}.icon-button{font-size:13px;padding:8px 4px;min-width:30px}.icon-button span{font-size:8px}.screen-overlay{padding:9px}.overlay-card{padding:17px 14px 20px}.panel-kicker{font-size:9px}.pixel-glyph{font-size:31px}.overlay-card h2{font-size:25px;margin:7px 0}.overlay-card p{font-size:12px;margin:8px auto}.rule-pills{margin:11px 0}.rule-pills span{font-size:9px;padding:6px}.primary-button{font-size:16px;padding:10px 20px;min-width:190px}.overlay-card small{font-size:8px;margin-top:12px}.game-viewport{aspect-ratio:4/5;max-height:68vh}.game-viewport canvas{width:100%;height:100%}.cabinet-footer{font-size:9px;padding:8px 12px}.machine-id{display:none}.mobile-controls{margin-left:auto;display:flex;gap:10px}.mobile-controls button{width:54px;height:44px;border:1px solid #5c81af;color:#fff;background:#314b70;font-size:22px;border-radius:4px;touch-action:manipulation}.sidebar{display:block;padding:17px}.lesson-card{display:block;margin-bottom:15px}.lesson-card .divider{margin:20px 0 14px}.page-footer{padding:15px;font-size:8px}.quiz-header{margin:4px 0 8px}.quiz-icon{width:42px;height:42px;font-size:28px}.quiz-bonus{font-size:8px}.quiz-question{font-size:15px!important;min-height:42px}.quiz-answer{font-size:17px;padding:10px}.quiz-actions{margin-top:10px}.quiz-feedback{min-height:18px;margin:7px auto!important}.compact-card h2{font-size:35px}}
@media(max-width:420px){.stat:nth-child(2){display:none}.site-header h1{letter-spacing:0}.game-viewport{max-height:66vh}.overlay-card p{line-height:1.35}.rule-pills{gap:4px}.overlay-card small{letter-spacing:0}}
.privacy-notice{margin:0 2px 25px;color:#8da1c4;font:11px/1.5 'Courier New',monospace;letter-spacing:.3px;max-width:1000px}
@media(max-width:700px){.privacy-notice{margin:0 15px 18px;font-size:10px}}
.return-link{display:inline-block;color:#77f7e2;text-decoration:none;border:1px solid #3b9e99;padding:9px 12px;background:#123a4a;font-size:11px;letter-spacing:.7px}
.return-link:hover,.return-link:focus-visible{color:#fff9d1;border-color:#ffdc82;background:#215768;text-decoration:underline}
