:root{--ink:#173c33;--muted:#748078;--lime:#d9ef95;--paper:#f6f7f2;--line:#dfe5d9;--blue:#377edc;--orange:#d87943}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:14px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #7aa83c;outline-offset:4px}button{touch-action:manipulation}.topbar{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 4.2%;border-bottom:1px solid var(--line);background:#fafbf6}.brand{display:flex;align-items:center;gap:9px;background:none;border:0;padding:0;font-size:24px;font-weight:750;letter-spacing:-1.3px}.brand-icon{display:inline-flex;align-items:center;background:var(--ink);color:#e8f4be;padding:10px 9px;border-radius:10px;font-size:22px;letter-spacing:-2px;position:relative}.brand-icon>span{font-size:16px;align-self:flex-start;margin-left:5px}.brand-dot{color:#9fb962}.top-center{display:flex;align-items:center;gap:8px;color:#758077;font-size:12px;font-weight:500}.status-dot,.scene-dot{display:inline-block;width:7px;height:7px;background:#93b859;border-radius:50%}.quiet{display:flex;align-items:center;gap:8px;background:none;border:0;font-size:12px;font-weight:600}.quiet>span{font-size:21px}main{max-width:1600px;margin:auto;padding:34px 4.2% 0}.introline{display:flex;align-items:center;gap:13px;color:#758077;font-size:11px;letter-spacing:.1px}.chapter-tag{color:#2e5948;letter-spacing:1.7px;font-size:10px;font-weight:750}.demo-tag{border:1px solid #d3dccb;padding:4px 8px;border-radius:5px;font-size:10px;margin-left:auto}.title-row{display:flex;align-items:center;justify-content:space-between;margin:17px 0 25px;gap:18px}h1{font-size:clamp(26px,3.1vw,44px);font-weight:650;letter-spacing:-1.8px;line-height:1.14;margin:0 0 12px}h1>span:first-child{color:#80957b;font-weight:450}.green-dot{color:#8ba655}.title-row p{color:#778173;font-size:13px;line-height:1.5;margin:0}.lesson-length{display:flex;gap:10px;color:#798275;font-size:11px;line-height:1.8;white-space:nowrap}.lesson-length strong{font-weight:500;color:#334e3d}.clock{font-size:29px;line-height:1.4;color:#8b9b7d}.lesson-grid{display:grid;grid-template-columns:minmax(0,1.85fr) minmax(315px,1fr);gap:22px;align-items:stretch}.scene-panel{background:#e7eddf;min-width:0;border:1px solid #d6dece;border-radius:19px;overflow:hidden;position:relative;display:flex;flex-direction:column}.scene-top{position:absolute;z-index:3;left:22px;right:22px;top:18px;display:flex;justify-content:space-between;align-items:center;pointer-events:none;font-size:12px;font-weight:600;color:#344b35}.scene-top>div{display:flex;gap:7px;align-items:center}.scene-dot{width:6px;height:6px;background:#738b57}.scene-badge{font-size:9px;letter-spacing:1.5px;background:#f7f9f0b8;border:1px solid #cbd7bf;padding:6px 9px;border-radius:5px}.scene-wrap{position:relative;min-height:510px;flex:1;overflow:hidden;background:radial-gradient(ellipse at 50% 25%,#eff1e5,#dce5d1)}#world{width:100%;height:100%;display:block;position:absolute;inset:0}.view-switch{position:absolute;top:56px;right:15px;display:flex;flex-direction:column;gap:3px;padding:4px;background:#ffffffb0;border-radius:10px;border:1px solid #ffffffa0}.view-switch button{border:0;background:none;width:33px;height:32px;border-radius:7px;font-size:22px;color:#76836b}.view-switch button.active{background:var(--ink);color:#eef7dd}.world-label{position:absolute;display:flex;align-items:center;gap:6px;white-space:nowrap;padding:8px 11px;background:#ffffffee;border:1px solid #ffffffd0;box-shadow:0 4px 12px #23321a12;font-size:10px;font-weight:600;border-radius:8px;pointer-events:none;transform:translate(-50%,-100%);transition:opacity .2s;z-index:2}.label-dot{width:6px;height:6px;background:var(--blue);border-radius:50%}.world-label:after{content:"";position:absolute;left:50%;bottom:-5px;width:8px;height:8px;background:#fffffff0;transform:rotate(45deg)}.scene-hint{position:absolute;top:56px;left:22px;padding:7px 10px;border-radius:6px;background:#f8fbf1a3;font-size:10px;color:#6a7e5b;max-width:75%}.scene-hint span{font-size:15px;margin-right:4px}.speed-card{position:absolute;left:19px;bottom:19px;width:128px;height:83px;background:#fffffff0;border-radius:12px;box-shadow:0 2px 8px #344b3510;padding:12px 15px}.speed-card>strong{font-size:27px;font-weight:550;line-height:1;letter-spacing:-1px}.speed-card>span{font-size:8px;color:#8a9384;margin-left:5px;letter-spacing:.8px}.speed-card i{display:inline-block;width:5px;height:5px;background:#9ab879;border-radius:50%;position:absolute;top:19px;right:13px}.speed-card small{display:block;font-size:9px;color:#798575;margin-top:9px;white-space:nowrap}.camera-note{position:absolute;bottom:23px;right:17px;font-size:8px;color:#6f7e64;letter-spacing:.2px}.playback{height:65px;display:flex;align-items:center;gap:11px;background:#f8faf3;border-top:1px solid #d6dece;padding:0 18px;z-index:3}.round-button{border:0;border-radius:50%;background:var(--ink);color:#eff6de;width:32px;height:32px;display:grid;place-items:center;font-size:10px;flex:none}.round-button.secondary{background:transparent;color:#66785a;font-size:22px;width:25px}.animation-track{height:3px;flex:1;background:#dce4d4;border-radius:4px;overflow:hidden;margin-left:3px}.animation-track>span{display:block;width:0;height:100%;background:#7c9d57;border-radius:4px}.animation-time{font-variant-numeric:tabular-nums;color:#7f8c74;font-size:10px;width:30px}.slow-button{border:1px solid #dbe3d1;background:transparent;padding:5px 6px;border-radius:5px;font-size:10px;width:32px}.slow-button[aria-pressed=true]{background:var(--lime)}.lesson-panel{border:1px solid #e0e5d9;background:#fffefa;border-radius:19px;padding:26px 26px 18px;display:flex;flex-direction:column;min-height:575px}.eyebrow{display:flex;align-items:center;justify-content:space-between;font-size:9px;font-weight:700;letter-spacing:1.5px;color:#839276;gap:10px}#step-number{font-weight:500;font-variant-numeric:tabular-nums;letter-spacing:.5px}.sign-display{height:63px;display:flex;align-items:center;gap:10px;margin:22px 0 18px}.sign-display:empty{height:14px;margin:16px 0 10px}.sign-display svg{height:63px;width:63px;overflow:visible}.sign-display .sign-divider{width:23px;height:1px;background:#cad3bc;margin:0 4px}.lesson-panel h2{font-size:clamp(25px,2.35vw,35px);font-weight:580;letter-spacing:-1.1px;line-height:1.15;margin:0 0 15px}.step-text{font-size:13px;line-height:1.8;color:#697462;margin:0 0 20px}.key-note{display:flex;align-items:flex-start;gap:10px;padding:13px 14px;background:#f1f5e6;border-radius:9px;margin-bottom:17px}.note-symbol{border:1px solid #a7b78e;border-radius:50%;font-size:9px;display:grid;place-items:center;width:15px;height:15px;flex:none;margin-top:1px}.key-note p{margin:0;line-height:1.7;font-size:11px;color:#4f6544}.answers{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.answers:empty{display:none}.answer{background:#fffefa;border:1px solid #dce2d5;display:flex;align-items:center;gap:12px;text-align:left;padding:11px 12px;border-radius:9px;font-size:12px;line-height:1.6;transition:background .15s,border-color .15s}.answer:hover:not(:disabled){background:#f2f6e6;border-color:#9eaf88}.answer-letter{border:1px solid #d8dfcc;width:25px;height:25px;border-radius:6px;display:grid;place-items:center;font-size:10px;flex:none;color:#6b7b59}.answer.correct{background:#e9f2db;border-color:#7d9d57}.answer.correct .answer-letter{background:#527343;color:white;border-color:#527343}.answer.wrong{background:#fbede5;border-color:#ce957b}.answer:disabled{cursor:default;opacity:1;color:var(--ink)}.answer.result-dim{opacity:.55}.feedback{padding:12px 13px;border-radius:8px;font-size:11px;line-height:1.7;background:#eff5e5;color:#46653e;margin:0 0 13px}.feedback.wrong-feedback{background:#fbf1e9;color:#926346}.feedback strong{display:block;font-size:12px;margin-bottom:4px}.feedback[hidden],.key-note[hidden],.compare[hidden],.results[hidden],.no-webgl[hidden]{display:none}.lesson-bottom{margin-top:auto;padding-top:7px}.voice{border:0;display:flex;align-items:center;gap:8px;font-size:10px;color:#7f8c72;background:none;margin:0 0 17px;padding:0}.voice>span:first-child{font-size:14px}.voice[aria-pressed=true]{color:#426535}.next-button{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--ink);border:0;color:#eff4df;width:100%;border-radius:10px;padding:16px 18px;font-weight:550;font-size:13px;transition:background .15s,transform .15s}.next-button:hover:not(:disabled){background:#2d5844;transform:translateY(-1px)}.next-button>span:last-child{font-size:20px;line-height:1}.next-button:disabled{background:#e6ebdf;color:#96a08b;cursor:default}.next-hint{font-size:9px;line-height:1.6;color:#9aa38e;text-align:center;margin:10px 0 0;min-height:15px}.lesson-progress{padding:22px 0 21px;border-bottom:1px solid var(--line)}.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:11px}.progress-header>span{font-size:9px;letter-spacing:1.6px;font-weight:650;color:#7c8970}.progress-header>strong{font-size:10px;font-weight:500;color:#718061}.overall-track{height:4px;background:#e0e6d9;border-radius:4px;overflow:hidden}.overall-track>span{height:100%;width:0;display:block;background:#779a4a;border-radius:4px;transition:width .4s}.route-stops{display:flex;justify-content:space-between;margin-top:16px;gap:12px}.route-stops>button{display:flex;align-items:center;gap:8px;border:0;padding:0;background:none;font-size:10px;color:#9aa58b;text-align:left}.route-stops>button.active{color:#3c5734}.route-circle{display:grid;place-items:center;border:1px solid #d6dfca;font-size:8px;font-weight:600;width:21px;height:21px;border-radius:50%;flex:none}.route-stops>button.active .route-circle{background:var(--ink);border-color:var(--ink);color:#f4f7e8}.route-stops>button.done .route-circle{background:#e2edca;border-color:#c5d3aa;color:#54733d}footer{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:22px 0;color:#96a08d;font-size:10px}footer strong{font-weight:400;color:#64775b}footer button{padding:0;border:0;background:none;color:#8b987f;font-size:10px}.compare{display:flex;gap:7px;margin:0 0 15px}.compare button{background:#f8faf3;border:1px solid #d7e1ca;flex:1;border-radius:8px;padding:10px 6px;font-size:10px}.compare button.selected{background:#e4edcf;border-color:#8fa374}.results{font-size:12px;color:#4d6343;line-height:1.8;margin-bottom:15px}.results strong{font-size:25px;display:block;font-weight:550;letter-spacing:-.5px}.no-webgl{position:absolute;inset:130px 25px auto;z-index:4;background:#fffefa;padding:25px;border-radius:12px;line-height:1.8}.no-webgl strong{font-size:20px}dialog{border:1px solid var(--line);border-radius:18px;background:#fffefa;color:var(--ink);max-width:620px;width:calc(100% - 30px);padding:35px}dialog::backdrop{background:#173c3366;backdrop-filter:blur(4px)}dialog h2{font-size:29px;line-height:1.2;letter-spacing:-1px;font-weight:550;margin:18px 0}dialog h3{font-size:14px;margin:23px 0 8px}dialog p{font-size:13px;line-height:1.9;color:#6d7b63}dialog a{color:#426d4c}.close-dialog{position:absolute;right:16px;top:10px;background:none;border:0;font-size:28px;color:#91a280}.sign-tip{display:flex;align-items:center;gap:10px}.finish-badge{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;font-size:24px;background:#e5efce;color:#4b7237}
@media(min-width:1500px){.scene-wrap{min-height:580px}.lesson-panel{padding:30px}.title-row{margin-bottom:30px}}@media(max-width:1050px){main{padding:25px 3% 0}.topbar{padding:0 3%;height:74px}.lesson-grid{gap:15px;grid-template-columns:minmax(0,1.5fr) minmax(305px,1fr)}.scene-wrap{min-height:510px}.lesson-panel{padding:22px 20px 18px}h1{font-size:32px}.lesson-panel h2{font-size:28px}.world-label{font-size:9px;padding:7px 8px}.camera-note{max-width:110px;text-align:right;line-height:1.5}.lesson-length{display:none}}@media(max-width:760px){.topbar{height:65px;padding:0 20px}.brand{font-size:21px}.brand-icon{font-size:19px;padding:8px}.top-center{display:none}.quiet{font-size:10px}.introline{font-size:9px;gap:9px}.chapter-tag{font-size:8px;letter-spacing:1px}.demo-tag{font-size:8px;padding:4px 6px}main{padding:23px 18px 0}.title-row{margin:17px 0 20px}h1{font-size:31px;letter-spacing:-1.1px;max-width:360px}.title-row p{font-size:12px}.lesson-grid{grid-template-columns:1fr;gap:17px}.scene-wrap{min-height:350px}.scene-top{left:16px;right:16px;top:15px}.scene-hint{font-size:8px;left:15px;top:47px;max-width:70%}.view-switch{right:12px;top:48px}.view-switch button{width:28px;height:28px;font-size:20px}.speed-card{width:112px;height:74px;bottom:14px;left:14px;padding:11px 13px}.speed-card strong{font-size:24px}.speed-card small{font-size:8px}.camera-note{font-size:7px;bottom:16px}.playback{height:58px;padding:0 14px}.lesson-panel{min-height:0;padding:23px 23px 19px}.sign-display{margin:17px 0 14px;height:50px}.sign-display svg{height:50px;width:50px}.lesson-panel h2{font-size:29px;max-width:400px}.step-text{font-size:13px;margin-bottom:16px}.lesson-bottom{padding-top:8px}.voice{margin-bottom:15px}.next-button{padding:15px 17px}.lesson-progress{padding-top:22px}.route-stops{gap:8px}.route-stops>button{gap:5px;align-items:flex-start;font-size:9px;max-width:86px;line-height:1.6}.route-circle{width:18px;height:18px;font-size:7px}.world-label{font-size:8px}.key-note p{font-size:11px}footer{font-size:9px}footer button{font-size:9px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.next-button,.overall-track>span{transition:none}}

.world-hotspots {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.world-hotspot {
  position: absolute;
  min-width: 24px;
  min-height: 24px;
  padding: 0;
  transform: translate(-50%, -50%);
  border: 0;
  border-radius: 5px;
  background: transparent;
  pointer-events: auto;
  cursor: help;
}
.world-hotspot:focus-visible {
  outline-offset: 1px;
}
.world-tooltip {
  position: absolute;
  z-index: 4;
  width: min(218px, calc(100% - 16px));
  padding: 10px 12px;
  border-radius: 8px;
  background: #fffefa;
  box-shadow: 0 3px 14px #173c3329;
  font-size: 12px;
  line-height: 1.5;
  pointer-events: none;
}
.world-tooltip strong,
.world-tooltip span {
  display: block;
}
.world-tooltip strong {
  margin-bottom: 3px;
}
.world-label[hidden],
.world-tooltip[hidden],
.world-hotspot[hidden] {
  display: none;
}
@media (pointer: coarse) {
  .world-hotspot {
    min-width: 44px;
    min-height: 44px;
  }
}

.course-header{position:sticky;top:0;z-index:10}
.course-header-actions{display:flex;align-items:center;gap:16px}
.course-header-actions .quiet{text-decoration:none;color:inherit}
.course-header-actions .restart-label{font-size:inherit}
.course-home{display:inline-flex;align-items:center;gap:7px;white-space:nowrap;text-decoration:none;color:#f6f9ec;background:var(--ink);border-radius:9px;padding:10px 13px;font-size:12px;font-weight:700;min-height:40px}
.course-home:hover{background:#2d5844}
#lesroute{scroll-margin-top:100px}
@media(max-width:520px){
  .course-header-actions{gap:10px}
  .course-header-actions .course-shortcut,.course-header-actions .restart-label{display:none}
  .course-home{padding:8px 10px;min-height:38px}
}
.course-header ~ main #step-title{scroll-margin-top:90px}

.attention-label{display:inline-block;width:fit-content;padding:3px 7px;border:1px solid #e6c48b;border-radius:5px;background:#fff1d8;color:#795016;font-size:11px;font-weight:700;line-height:1.3}
.attention-tip{display:grid;gap:6px;margin:0 0 13px;padding:10px 12px;border-left:3px solid #d5a250;border-radius:5px;background:#fff8ea;color:#67491f;font-size:12px;line-height:1.5}
.attention-tip[hidden]{display:none}
.hub-card-body>.attention-label{margin-bottom:7px}