:root{font-family:Arial,sans-serif;color:#173c33;background:#faf8ee;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a,select{-webkit-tap-highlight-color:transparent}button,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #ea8751;outline-offset:4px}[hidden]{display:none!important}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;max-width:1440px;padding:0 4%;margin:auto}.brand{display:flex;align-items:center;gap:12px;color:#184d3f;text-decoration:none;font-size:16px;letter-spacing:2px}.brand-mark{display:grid;place-items:center;background:#184d3f;color:#fff1c5;border-radius:14px;width:40px;height:40px;font-size:15px;font-weight:900;letter-spacing:-1px}.brand small{display:block;font-size:8px;letter-spacing:2.2px;margin-top:5px}.topbar nav{display:flex;gap:25px;align-items:center;font-size:14px}.topbar a{color:inherit}.topbar nav a{text-decoration:none;border-bottom:1px solid #9ab1a3;padding:5px}.topbar nav span{font-size:19px}#arena{position:relative;width:100%;height:760px;max-height:calc(100svh - 114px);min-height:650px;overflow:hidden;background:#88d6df}#scene{display:block;width:100%;height:100%;position:absolute;inset:0}.vignette{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#c2e8d7a8,transparent 60%)}.lobby{position:relative;height:100%;max-width:1340px;margin:auto;padding:48px 5%;display:grid;grid-template-columns:1fr 390px;align-items:start;gap:30px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:800;color:#1a6950}.intro{padding-top:18px}.intro h1{font-size:clamp(66px,7vw,104px);line-height:.9;letter-spacing:-6px;margin:20px 0 15px;color:#174e3e;text-shadow:0 4px 0 #ffffff6b;font-weight:1000}.intro h1 em{font-style:normal;color:#fbe070;text-shadow:0 5px 0 #c18f35,0 8px 0 #174e3e}.intro h1 em span{font-size:50px;vertical-align:middle;padding-left:10px;color:#fff9dc;text-shadow:0 3px 0 #c18f35}.tagline{font-size:29px;font-weight:800;letter-spacing:-1px;margin:24px 0 8px}.intro-copy{font-size:17px;line-height:1.5;margin:0;color:#285a4a}.badges{display:flex;gap:8px;margin-top:22px;font-size:11px;font-weight:700}.badges span{padding:9px 13px;border:1px solid #2f67464d;background:#f5ffe875;border-radius:22px}.setup{padding:24px;background:#fffdf4f5;border:2px solid #fff;border-radius:24px;box-shadow:0 20px 70px #1d554237;backdrop-filter:blur(10px)}.setup-head{display:flex;gap:14px;margin-bottom:23px;align-items:center}.flag{display:grid;place-items:center;background:#f8e59e;width:45px;height:45px;border-radius:14px;font-size:29px}.setup-head h2{font-size:19px;letter-spacing:-.4px;margin:0 0 5px}.setup-head p{font-size:12px;margin:0;color:#6c786a}fieldset{border:0;padding:0;margin:0 0 18px}legend,.lesson-label{font-size:10px;letter-spacing:1px;color:#86a28b;font-weight:bold;margin:0 0 10px}legend span,.lesson-label span{color:#354d41;margin-left:7px;letter-spacing:0;font-size:12px}.track-options{display:flex;gap:10px}.track{flex:1;border:2px solid transparent;background:#f0f1e7;border-radius:12px;padding:5px 5px 10px;text-align:left;overflow:hidden;color:#284e3e}.track.selected{border-color:#2b795b;background:#e8f0dc}.track strong{font-size:11px;display:block;margin:8px 3px 3px}.track small{font-size:10px;color:#6d7764;margin:0 3px}.track-art{height:63px;display:block;position:relative;overflow:hidden;border-radius:7px;background:linear-gradient(#8ad5e5 55%,#9fc361 55%)}.track-art:before{content:'';position:absolute;width:150px;height:70px;border-radius:70% 50% 0 0;background:#5b9d62;top:25px;left:-40px;transform:rotate(-14deg)}.track-art:after{content:'';position:absolute;width:36px;height:100px;background:#909d91;left:65px;top:28px;transform:rotate(25deg);border:4px solid #f7eed7}.track-art b{position:absolute;right:15px;top:4px;color:#fff5c3;font-size:24px}.track-art.canyon{background:linear-gradient(#ffcf9a 55%,#dfab70 55%)}.track-art.canyon:before{background:#b86e4e;border-radius:20%;transform:rotate(10deg)}.settings-row{display:flex;gap:24px}.settings-row label{flex:1;font-size:11px;color:#687969}.colors{display:flex;gap:12px;margin-top:10px}.color{width:27px;height:27px;background:var(--color);border:3px solid #fff;border-radius:50%;box-shadow:0 0 0 1px #c4cabc}.color.selected{box-shadow:0 0 0 2px #25674e;transform:scale(1.08)}select{width:100%;border:1px solid #d4dcca;border-radius:10px;padding:11px;background:#fffdf6;color:#234b3c;font-size:12px;min-height:42px}.settings-row select{margin-top:5px}.lesson-label{display:block}.lesson-note{font-size:10px;color:#73816d;line-height:1.6;margin:7px 0 16px}.lesson-note a{color:#266f51;white-space:nowrap}.primary{display:flex;align-items:center;justify-content:center;gap:30px;background:#235f47;color:white;border:0;border-radius:13px;padding:16px;width:100%;font-size:16px;font-weight:bold;box-shadow:0 4px 0 #133c2d}.primary:hover{background:#327654}.primary span{font-size:22px}.load-status{font-size:12px;margin:7px 0;color:#9b5739}.load-status:empty{display:none}.best{font-size:11px;text-align:center;color:#46644b;margin:12px 0 0}.review-note{text-align:center;font-size:9px;color:#74826f;margin:9px 0 0}.lobby-bottom{position:absolute;bottom:20px;left:5%;right:5%;display:flex;justify-content:space-between;gap:15px;color:#fffef1;font-size:11px;text-shadow:0 1px 4px #26392d}.lobby-bottom b{background:#f7ffe5;color:#2d5440;padding:4px 7px;border-radius:5px;text-shadow:none}.page-footer{display:flex;justify-content:space-between;gap:20px;padding:15px 4%;font-size:10px;color:#6e7f6f}.hud{position:absolute;inset:0;pointer-events:none;padding:25px 4%;color:#173e35}.hud button{pointer-events:auto;touch-action:none;user-select:none}.hud-top{display:flex;gap:15px;align-items:center}.position{display:flex;align-items:center;gap:8px;background:#fffdf0f2;border-radius:16px;padding:10px 18px;box-shadow:0 5px 0 #396a4920}.position strong{font-size:44px;line-height:1}.position span{font-size:17px;font-weight:bold}.position small{display:block;font-size:8px;margin-top:4px;letter-spacing:1px}.lapbox{background:#fffdf0e8;border-radius:14px;padding:10px 17px;min-width:150px}.lapbox span{font-size:12px;font-weight:800}.progress{background:#d2decc;border-radius:5px;height:5px;margin:6px 0}.progress i{display:block;height:5px;width:0;background:#2c7958;border-radius:5px}.lapbox small{font-size:11px}.coins{margin-left:auto;background:#fffdf0e8;padding:10px 18px;border-radius:14px;color:#ba8731;font-size:22px}.coins small{font-size:8px;display:block;color:#53715b;letter-spacing:1px}.icon-btn{border:0;background:#fffdf0e8;border-radius:12px;padding:12px 17px;color:#2b5844;font-size:23px}.race-note{position:absolute;left:50%;top:120px;transform:translateX(-50%);border-radius:30px;background:#fffdf0ec;box-shadow:0 5px 20px #0001;padding:12px 20px;font-size:13px;text-align:center;width:max-content;max-width:90%}.hud-bottom{position:absolute;bottom:25px;left:4%;right:4%;display:flex;align-items:flex-end;gap:12px;justify-content:space-between}.steering{display:flex;gap:12px}.steering button{width:72px;height:65px;border:2px solid #fff9;background:#fbfff0b8;color:#205543;font-size:32px;border-radius:19px;box-shadow:0 5px 0 #173e352e}.steering button:active{transform:translateY(3px);background:#fff}.speed{color:white;text-shadow:0 2px 5px #16372d;display:flex;align-items:center;gap:7px}.speed b{font-size:36px}.speed small{font-size:9px}.actions{display:flex;align-items:center;gap:12px}.actions button{border:0;border-radius:15px;padding:18px;background:#ffffe3b8;color:#314c3d;font-weight:bold}.actions #turbo{color:#593f0c;background:#ffdb57;box-shadow:0 5px 0 #b88231;min-width:140px}.actions #turbo b{background:#fff8;padding:4px 8px;border-radius:50%;margin-left:8px}.modal{position:absolute;inset:0;display:grid;place-items:center;background:#123c3a8a;backdrop-filter:blur(6px);padding:20px;z-index:5;overflow:auto}.dialog{max-width:510px;width:100%;background:#fffdf4;border:2px solid white;border-radius:24px;padding:32px;box-shadow:0 20px 70px #0b2b3f60;max-height:100%;overflow:auto}.dialog h2{font-size:26px;line-height:1.2;letter-spacing:-.7px;margin:12px 0}.dialog p{font-size:14px;line-height:1.6;color:#60745f}.answer{display:block;width:100%;border:1px solid #cbd7bd;padding:15px;border-radius:13px;background:#f6f6e9;text-align:left;margin:9px 0;color:#234932;font-size:14px;line-height:1.4}.answer:hover{background:#ebf1da}.answer.correct{border:2px solid #378953;background:#e4f1d9}.answer.wrong{border:2px solid #b57a57;background:#fff0db}.answer:disabled{opacity:1;cursor:default}#feedback{font-size:13px;line-height:1.6;color:#376447;padding:8px 0}#feedback a{display:block;color:#617a56;font-size:11px}.dialog .secondary{background:transparent;color:#426a4e;border:1px solid #a4baa1;border-radius:12px;padding:12px;width:100%;margin-top:12px}.summary-grid{display:flex;gap:10px;margin:20px 0}.summary-grid div{flex:1;background:#eaf0de;padding:14px 8px;border-radius:12px;text-align:center}.summary-grid b{display:block;font-size:26px}.summary-grid span{font-size:10px}.racing .vignette{display:none}.racing #arena{height:calc(100svh - 76px);max-height:none;min-height:420px}.racing .page-footer{display:none}
@media(min-width:1500px){.lobby{grid-template-columns:1fr 420px}.setup{padding:28px}.track-art{height:78px}}
@media(max-width:760px){.topbar{height:62px;padding:0 5%}.brand{font-size:12px;gap:8px}.brand-mark{width:32px;height:32px;border-radius:10px;font-size:12px}.brand small{font-size:6px}.topbar nav{gap:14px;font-size:11px}#arena{height:auto;max-height:none;min-height:1050px}.lobby{display:block;padding:24px 6% 60px}.intro{padding:0;min-height:315px}.eyebrow{font-size:8px;letter-spacing:1.5px}.intro h1{font-size:66px;letter-spacing:-4px;margin:18px 0 8px}.intro h1 em span{font-size:30px}.tagline{font-size:23px;margin:20px 0 5px}.intro-copy{font-size:13px}.badges{margin-top:12px;font-size:9px}.badges span{padding:6px 10px}.setup{max-width:420px;margin:auto;padding:22px}.lobby-bottom{bottom:18px;display:block;font-size:10px;text-align:center}.lobby-bottom span{display:block;margin-top:10px}.lobby-bottom span:first-child{display:none}.page-footer{font-size:9px;line-height:1.5;display:block;text-align:center}.page-footer span{display:block}.vignette{background:linear-gradient(90deg,#d1eedca6,transparent)}.racing #arena{height:calc(100svh - 62px);min-height:380px}.hud{padding:13px 4%}.hud-top{gap:7px}.position{padding:9px 12px;gap:4px;border-radius:12px}.position strong{font-size:33px}.position span{font-size:11px}.position small{font-size:6px}.lapbox{min-width:110px;padding:10px}.lapbox span{font-size:10px}.coins{padding:9px 11px;font-size:17px}.coins small{font-size:6px}.icon-btn{padding:10px 12px;font-size:20px}.race-note{top:95px;font-size:11px;padding:9px 14px}.hud-bottom{bottom:25px;gap:5px}.steering{gap:7px}.steering button{width:55px;height:61px;font-size:26px;border-radius:14px}.speed{position:absolute;bottom:80px;left:0}.speed b{font-size:26px}.actions{gap:7px}.actions button{padding:18px 10px;font-size:11px}.actions #turbo{min-width:108px}.dialog{padding:23px}.dialog h2{font-size:22px}.dialog p{font-size:12px}.answer{font-size:13px;padding:13px}.racing .topbar nav a{font-size:10px}}
@media(max-height:540px) and (orientation:landscape){.topbar{height:48px}.racing #arena{height:calc(100svh - 48px);min-height:280px}.hud{padding:8px 3%}.hud-top{transform:scale(.8);transform-origin:top left;width:125%}.race-note{top:65px;padding:6px 13px}.hud-bottom{bottom:12px}.steering button{height:48px}.dialog{max-height:95%;padding:18px}.dialog h2{font-size:20px}.answer{margin:5px 0;padding:9px}.dialog .primary{padding:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.sound-toggle{font-size:11px;border:1px solid #aec2ac;padding:7px 10px;border-radius:20px;color:#346749;background:#f1f3e7}@media(max-width:760px){.topbar nav{gap:9px}.sound-toggle{font-size:9px;padding:6px}.brand small{letter-spacing:1px}}

.audio-settings{position:relative;z-index:20}.audio-settings summary{list-style:none;cursor:pointer;font-size:12px;color:#285c43;border:1px solid #adbea7;padding:9px 13px;border-radius:22px;background:#edf2df;white-space:nowrap}.audio-settings summary::-webkit-details-marker{display:none}.audio-settings summary:focus-visible{outline:3px solid #ea8751;outline-offset:3px}#musicBadge{font-size:8px;letter-spacing:.5px;margin-left:5px;background:#245c43;color:white;padding:3px 5px;border-radius:5px}.audio-panel{position:absolute;right:0;top:45px;width:250px;padding:20px;border-radius:18px;background:#fffdf4;border:1px solid #d7dfc9;box-shadow:0 10px 40px #173e3533;font-size:13px}.audio-panel p{font-size:11px;color:#677e63;line-height:1.6}.audio-panel label{display:flex;justify-content:space-between;margin:18px 0 10px;font-size:12px}.audio-panel input{width:100%;accent-color:#2a7252;min-height:30px}.audio-panel button{display:block;min-height:36px}.audio-panel #soundToggle{margin-top:10px}.audio-panel #musicStatus:empty{display:none}.music-hint{font-size:10px;text-align:center;color:#6d7e61;margin:12px 0 0}.music-hint+.best{margin-top:6px}@media(max-width:760px){.audio-settings summary{padding:7px 9px;font-size:10px}.audio-panel{right:-60px}.audio-settings #musicBadge{font-size:7px;padding:2px 3px}.topbar nav{gap:8px}}@media(max-width:380px){.brand small{display:none}.brand{letter-spacing:1px}.topbar{padding:0 3%}.topbar nav a{font-size:10px}}

.study-choice{margin-bottom:10px}.study-filters{display:grid;grid-template-columns:125px minmax(0,1fr);gap:10px;margin-bottom:10px}.study-filters label,.topic-label{display:block;font-size:10px;color:#61775e}.study-filters select,.study-filters input{margin-top:5px;width:100%;min-width:0}.study-filters input{font:inherit;font-size:11px;border:1px solid #d4dcca;border-radius:10px;padding:11px;background:#fffdf6;color:#234b3c;min-height:42px}.study-filters input:focus-visible{outline:3px solid #ea8751;outline-offset:3px}.topic-label{margin-bottom:5px}.study-choice .lesson-note{margin-bottom:0}.question-context{font-size:24px!important;color:#174e3e!important;background:#edf2df;padding:12px;border-radius:12px;white-space:pre-line;text-align:center}#lesson{min-width:0;text-overflow:ellipsis}#modalText{overflow-wrap:anywhere}@media(min-width:761px){body:not(.racing) #arena{min-height:740px}.lobby{padding-top:32px}.setup{padding:20px}}@media(max-width:380px){.study-filters{grid-template-columns:110px minmax(0,1fr)}}