*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:85px}body{margin:0;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#142e36;background:#f6f8f5;font-size:15px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #5a95ef;outline-offset:5px}button:disabled{cursor:default;opacity:.45}[hidden]{display:none!important}header{height:88px;padding:0 max(5vw,24px);display:flex;align-items:center;justify-content:space-between;background:#071e29;color:#f4f8f6;border-bottom:1px solid #ffffff14;gap:20px}.brand{display:flex;align-items:center;gap:11px;font-weight:750;font-size:21px;letter-spacing:.5px}.brand-sub{font-weight:400;font-size:16px;margin-left:9px;color:#c0cece}nav{display:flex;gap:38px;font-size:14px}nav a{color:#c3d0d2}nav a:hover{color:#b5f36b}nav a:last-child{color:#b5f36b}nav a span{margin-left:8px}.header-label{color:#8ea7ad;font:11px Consolas,monospace;letter-spacing:2px}.hero{background:#071e29;color:white;padding:68px max(5vw,24px) 64px;display:grid;grid-template-columns:.9fr 1.15fr;gap:6%;align-items:center;min-height:565px;position:relative;overflow:hidden}.hero>div:not(.hero-orbit){position:relative;z-index:1}.hero-orbit{position:absolute;width:850px;height:850px;border:1px solid #ffffff07;border-radius:50%;right:-190px;top:-90px;box-shadow:0 0 0 100px #ffffff02,0 0 0 200px #ffffff02;pointer-events:none}.eyebrow{color:#b5f36b;letter-spacing:2px;font:12px "Segoe UI",sans-serif;font-weight:600;display:flex;align-items:center;gap:9px}.eyebrow i,.dot-label i{display:inline-block;width:6px;height:6px;background:#b5f36b;border-radius:50%}.hero h1{font-size:clamp(36px,4.2vw,64px);letter-spacing:-1.8px;line-height:1.28;margin:24px 0 22px;font-weight:750}.hero h1 span{color:#b5f36b}.hero-description{color:#a8bcbf;line-height:1.95;font-size:16px}.hero-actions{display:flex;gap:26px;align-items:center;margin:30px 0}.primary{background:#b5f36b;color:#173527;border:0;padding:16px 23px;border-radius:6px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:30px;transition:background .2s,transform .2s}.primary:hover:not(:disabled){background:#c6ff87;transform:translateY(-2px)}.text-link{font-size:14px;display:flex;gap:18px}.text-link:hover{color:#b5f36b}.hero-bottom{color:#738e94;font-size:11px;display:flex;gap:10px;align-items:center;letter-spacing:1px}.mini-line{width:25px;height:1px;background:#657f85}.film-heading{font-size:10px;letter-spacing:1.2px;color:#92aab0;display:flex;justify-content:space-between;margin-bottom:14px}.dot-label{display:flex;gap:6px;align-items:center}.video-shell{border:1px solid #ffffff24;border-radius:10px;overflow:hidden;position:relative;background:#152d3b;box-shadow:0 30px 90px #0003}video{width:100%;aspect-ratio:16/9;display:block;object-fit:contain}.video-error{padding:15px;color:#fff;background:#503233}.video-error a{text-decoration:underline}.film-caption{display:flex;align-items:center;justify-content:space-between;margin-top:20px}.film-caption b{font-size:14px;font-weight:500}.film-caption small{display:block;color:#6f919a;font-size:10px;margin-top:7px}.film-number{color:#b5f36b;font-size:20px}.film-number span{font-size:9px;color:#76949c;margin-left:8px;letter-spacing:1px}.fact-strip{padding:26px max(5vw,24px);display:grid;grid-template-columns:1fr 1fr 1fr 1.2fr;background:#eef2eb;border-bottom:1px solid #dfe6dc;align-items:center}.fact-strip>div{display:flex;gap:15px;align-items:center;border-right:1px solid #d3ddcf;padding:5px 25px}.fact-strip>div:first-child{padding-left:0}.fact-strip strong{font-size:35px;letter-spacing:-1.5px;font-weight:650}.fact-strip span{font-size:12px;color:#5c746f}.fact-strip>div:last-child{border:0;padding-right:0;justify-content:center;gap:20px}.fact-message .star{font-size:36px;color:#40633f}.fact-message span{line-height:1.6}.section{padding:80px max(5vw,24px)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:40px}.muted{color:#6c817c}.section-heading h2{font-size:33px;letter-spacing:-1px;margin:15px 0 0}.section-heading>p{line-height:1.8;font-size:13px;color:#738580;margin:0}.knowledge-layout{display:grid;grid-template-columns:.83fr 1.35fr .8fr;gap:4%;align-items:start}.knowledge-tab{width:100%;border:0;border-bottom:1px solid #dce4da;background:transparent;display:flex;align-items:center;gap:18px;padding:24px 0;text-align:left;color:#85918b;font-size:11px}.knowledge-tab span:first-child{font-size:15px;flex:1;font-weight:600}.knowledge-tab span:last-child{font-size:19px}.knowledge-tab.active{color:#183c32;border-bottom-color:#315844}.knowledge-tab.active span:last-child{color:#477b34}.tiny-label{font-size:10px;letter-spacing:1.5px;color:#6b857f;font-weight:600}.knowledge-content{padding-top:16px}.knowledge-content h3{font-size:27px;line-height:1.55;margin:15px 0 17px;letter-spacing:-.5px}.knowledge-content p{font-size:13px;line-height:1.95;color:#697b76;margin:0 0 13px}.source-link{font-size:11px;display:inline-block;margin-top:10px;color:#446b4d;text-decoration:underline;text-underline-offset:4px}.knowledge-art{background:#edf2e9;height:285px;border-radius:8px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}.globe{width:155px;height:155px;border:1px solid #9eae98;border-radius:50%;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(-14deg)}.globe b{font-size:58px;line-height:1;color:#294c38;background:#edf2e9;z-index:1;font-weight:500;padding:0 6px}.globe small{font-size:5px;letter-spacing:1px;color:#4d6e51;background:#edf2e9;z-index:1;padding:5px}.meridian{position:absolute;inset:-1px 33px;border:1px solid #acbca4;border-radius:50%}.m2{inset:-1px 56px}.latitude{position:absolute;inset:30px 0;border:1px solid #acbca4;border-radius:50%}.l2{inset:52px -1px}.l3{inset:70px -1px}.globe-equator{position:absolute;inset:-25px -24px;border:1px solid #a1b58e;border-radius:50%;transform:rotate(-28deg) scaleY(.45)}.orbit-dot{position:absolute;width:9px;height:9px;background:#3b6944;border:3px solid #d5e9c5;border-radius:50%;box-sizing:content-box}.od1{top:65px;right:45px}.od2{bottom:95px;left:26px;background:#9ece68}.art-coordinates{position:absolute;bottom:18px;left:18px;font:8px/1.7 Consolas,monospace;color:#83917a;letter-spacing:.8px}.members{margin-top:35px;border-top:1px solid #dce4da;border-bottom:1px solid #dce4da;padding:21px 0}.members summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;font-size:13px;color:#40594c}.members summary::-webkit-details-marker{display:none}.summary-plus{font-size:19px}.members[open] .summary-plus{transform:rotate(45deg)}.members>p{font-size:12px;color:#74877c}.member-list{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0}.member-list button{border:1px solid #dae3d5;padding:10px 13px;background:white;border-radius:4px;color:#47634e;font-size:12px}.member-list button:hover,.member-list button.active{background:#daefc8;border-color:#9ab582}.member-info{padding:12px;background:#edf2e9}.challenge{background:#0b2631;color:#f1f7f5;position:relative}.challenge .section-heading h2{font-size:32px}.challenge .section-heading h2 span{color:#b5f36b}.best-label{font-size:12px;color:#91a9ad;display:flex;gap:15px;align-items:center}.best-label b{font-size:23px;font-weight:500;color:#b5f36b}.game-layout{border:1px solid #34505b;border-radius:10px;display:grid;grid-template-columns:310px 1fr;overflow:hidden;min-height:500px}.game-sidebar{padding:30px;background:#102e3a;border-right:1px solid #34505b}.game-sidebar .tiny-label{color:#829da5}.modes{display:grid;gap:10px;margin:25px 0}.mode{border:1px solid #33505b;border-radius:7px;display:flex;align-items:center;gap:14px;padding:17px 14px;background:transparent;color:#d7e2e3;text-align:left}.mode.active{border-color:#b5f36b;background:#b5f36b0b}.mode b{font-size:14px;font-weight:500;display:block}.mode small{display:block;font-size:10px;color:#8ea7ae;margin-top:5px}.mode-icon{font-size:26px;color:#96b0b6;width:28px}.mode.active .mode-icon{color:#b5f36b}.mode-tick{margin-left:auto;visibility:hidden;color:#b5f36b}.mode.active .mode-tick{visibility:visible}.game-note{font-size:11px;color:#829fa8;line-height:1.9;margin:25px 0}.sidebar-footer{border-top:1px solid #36505a;padding-top:22px;display:flex;justify-content:space-between;align-items:center}.sidebar-footer span{font-size:8px;color:#74929b;letter-spacing:1px}.sidebar-footer b{color:#b5f36b;font-size:23px;font-weight:400}.game-main{background:radial-gradient(ellipse at 70% 40%,#123c45 0,transparent 65%);padding:38px 45px;min-width:0;display:flex;align-items:center;justify-content:center}.game-main>div{width:100%}.game-welcome{text-align:center}.welcome-symbol{color:#b5f36b;font-size:65px;line-height:1.2;margin-bottom:15px}.game-welcome .tiny-label,.game-result .tiny-label{color:#799ba3}.game-welcome h3{font-size:27px;line-height:1.5;font-weight:550;margin:15px 0}.game-welcome p{font-size:12px;color:#8da8b1;line-height:1.9;margin:18px 0 24px}.game-welcome>small{display:block;margin-top:23px;font-size:10px;color:#6f8c96}.game-status{display:flex;align-items:center;gap:22px;color:#a6bdc2;font-size:12px}#game-score{margin-left:auto;color:#b5f36b}#timer{font:15px Consolas,monospace;color:#b5f36b}#timer.urgent{color:#ffb19c}.progress-track{height:3px;background:#294650;margin:18px 0 26px}.progress-track>div{height:100%;background:#b5f36b;transition:width .3s}.question-tag{font-size:10px;letter-spacing:1px;color:#8dacb5}#question-text{font-size:23px;line-height:1.6;margin:12px 0 22px;font-weight:600;outline:none}.answers{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer{border:1px solid #3c5964;border-radius:6px;background:#ffffff03;color:#e5efef;text-align:left;padding:15px 12px;display:flex;align-items:center;gap:12px;font-size:13px;min-height:57px}.answer .letter{border:1px solid #526b73;border-radius:4px;width:25px;height:25px;flex-shrink:0;display:grid;place-items:center;font-size:11px;color:#91aab2}.answer:hover:not(:disabled){border-color:#b5f36b;background:#b5f36b0b}.answer:disabled{opacity:1}.answer.correct{border-color:#b5f36b;background:#b5f36b15}.answer.correct .letter{color:#133b29;background:#b5f36b;border-color:#b5f36b}.answer.wrong{border-color:#e89382;background:#c67e7615}.answer.wrong .letter{color:#1f282e;background:#f0ad9c;border-color:#f0ad9c}.feedback{font-size:12px;line-height:1.8;background:#b5f36b0a;border-left:2px solid #b5f36b;padding:12px 15px;margin:16px 0;color:#b8cfd0}.feedback b{display:block;color:#b5f36b;margin-bottom:3px}.feedback.incorrect{border-left-color:#f0ad9c}.feedback.incorrect b{color:#f0ad9c}.feedback a{color:#a8c894;text-decoration:underline;font-size:10px}.question-footer{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-top:25px}.question-footer>span{font-size:10px;color:#7d9ba5}.question-footer .primary{padding:12px 18px;font-size:12px;white-space:nowrap}.game-result{text-align:center}.result-stars{font-size:35px;color:#b5f36b;letter-spacing:10px;margin-bottom:20px}.game-result h3{font-size:27px;margin:18px 0}.result-score b{font-size:63px;color:#b5f36b;font-weight:500;letter-spacing:-2px}.result-score>span{font-size:15px;color:#7c9aa5;margin-left:9px}.game-result>p{font-size:12px;color:#8eaab3;line-height:1.8}.result-stats{display:flex;justify-content:center;gap:33px;margin:25px 0}.result-stats span{font-size:10px;color:#89a4ad}.result-stats b{display:block;color:#d2e4e4;font-size:18px;margin-top:8px;font-weight:500}.result-actions{display:flex;gap:12px;justify-content:center}.secondary{background:transparent;color:#b5f36b;border:1px solid #627d6a;border-radius:5px;padding:13px 18px}.saved-note{font-size:10px!important;color:#698d98!important;margin-bottom:0}.closing{text-align:center;padding:65px 24px;background:#e8efdf}.closing .eyebrow{justify-content:center;font-size:10px}.closing h2{font-size:30px;font-weight:550;margin:22px 0}.closing>a{font-size:12px;display:inline-flex;gap:28px;border-bottom:1px solid #85997a;padding-bottom:10px}footer{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px max(5vw,24px)}footer .brand{font-size:15px}footer>span{font-size:10px;line-height:1.9;color:#89968e}footer>a:last-child{font-size:11px;color:#617667}.skip{position:fixed;top:-100px;left:10px;z-index:10;padding:15px;background:#b5f36b}.skip:focus{top:10px}.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:#b5f36b;color:#173527;padding:13px 20px;z-index:10;border-radius:6px;box-shadow:0 5px 25px #0003;font-size:12px}section{scroll-margin-top:20px}@media(min-width:1500px){header,.hero,.fact-strip,.section,footer{padding-left:max(5vw,calc((100vw - 1400px)/2));padding-right:max(5vw,calc((100vw - 1400px)/2))}}@media(max-width:1050px){.header-label{display:none}.hero{gap:4%;padding-top:50px;padding-bottom:45px}.hero h1{font-size:42px}.hero-description{font-size:13px}.hero-actions{gap:15px}.hero-actions .primary{padding:14px 17px;gap:18px}.text-link{font-size:12px}.knowledge-layout{grid-template-columns:.8fr 1.4fr}.knowledge-art{display:none}.game-layout{grid-template-columns:260px 1fr}.game-sidebar{padding:24px 20px}.game-main{padding:30px}.challenge .section-heading h2 span{display:block;margin-top:5px}.fact-strip>div{padding:5px 18px}.fact-strip strong{font-size:30px}.fact-strip span{font-size:10px}}@media(max-width:720px){header{height:74px;padding:0 22px}.brand{font-size:18px}.brand-sub{font-size:13px}header .brand img{width:31px;height:31px}nav{gap:19px;font-size:11px}nav a:first-child{display:none}.hero{grid-template-columns:1fr;padding:38px 22px 35px;gap:35px}.hero h1{font-size:43px;margin-top:23px}.hero-description{font-size:14px}.hero-bottom{display:none}.hero-actions{margin-bottom:0;gap:25px}.film-heading{font-size:9px}.film-caption b{font-size:12px}.fact-strip{padding:20px 22px;grid-template-columns:1fr 1fr 1fr}.fact-strip>div{display:block;padding:0 16px}.fact-strip strong{font-size:28px;display:block}.fact-strip span{font-size:10px;display:block;margin-top:4px}.fact-strip>div:nth-child(3){border:0}.fact-strip .fact-message{display:none}.section{padding:49px 22px}.section-heading{margin-bottom:25px}.section-heading h2{font-size:27px}.section-heading>p{display:none}.knowledge-layout{grid-template-columns:1fr;gap:18px}.tab-list{display:flex;gap:12px}.knowledge-tab{padding:15px 0;gap:7px}.knowledge-tab span:first-child{font-size:12px}.knowledge-tab span:last-child{display:none}.knowledge-content{padding-top:4px}.knowledge-content h3{font-size:25px}.knowledge-content p{font-size:13px}.members{margin-top:25px}.challenge .section-heading{align-items:start;flex-direction:column;gap:20px}.challenge .section-heading h2{font-size:27px}.challenge .section-heading h2 span{display:inline}.best-label{font-size:10px}.best-label b{font-size:17px}.game-layout{grid-template-columns:1fr}.game-sidebar{padding:20px;border-right:0;border-bottom:1px solid #34505b}.modes{display:grid;grid-template-columns:1fr 1fr 1fr;gap:7px;margin:15px 0 0}.mode{padding:12px 5px;display:block;text-align:center}.mode-icon{display:block;margin:0 auto 8px;font-size:21px}.mode b{font-size:11px}.mode small{font-size:8px;line-height:1.7}.mode-tick{display:none}.game-note,.sidebar-footer{display:none}.game-main{padding:27px 20px;min-height:435px}.game-welcome h3{font-size:23px}.game-welcome>small{font-size:9px;line-height:1.6}.answers{grid-template-columns:1fr}.answer{min-height:48px;padding:11px;font-size:12px}#question-text{font-size:20px}.question-footer{gap:10px}.question-footer>span{font-size:9px;line-height:1.7}.question-footer .primary{gap:10px}.game-status{gap:10px;font-size:11px}.result-stats{gap:25px}.result-actions .primary,.result-actions .secondary{font-size:12px;padding:13px 18px}.closing{padding:45px 22px}.closing h2{font-size:23px}footer{flex-wrap:wrap;padding:26px 22px;gap:20px}footer>span{order:3;width:100%}footer>a:last-child{font-size:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
.header-tools{display:flex;align-items:center;gap:22px}.language-switch{display:inline-flex;padding:3px;border:1px solid #36515a;border-radius:6px;gap:3px;flex-shrink:0}.language-switch button{background:transparent;color:#a9bfc5;border:0;border-radius:3px;padding:7px 10px;font-size:11px;line-height:1.2}.language-switch button[aria-pressed="true"]{background:#b5f36b;color:#173527;font-weight:650}.language-switch button:hover{color:white}.language-switch button[aria-pressed="true"]:hover{color:#173527}html[lang="en"] .hero h1{font-size:clamp(35px,3.6vw,57px);line-height:1.15;letter-spacing:-1.7px}html[lang="en"] .hero-actions{flex-wrap:wrap;gap:18px}html[lang="en"] .hero-description{font-size:14px}html[lang="en"] .knowledge-tab{gap:12px}html[lang="en"] .knowledge-tab span:first-child{font-size:13px}html[lang="en"] .challenge .section-heading h2{max-width:720px;font-size:30px}html[lang="en"] .mode b{font-size:13px}html[lang="en"] .mode small{line-height:1.5;font-size:10px}html[lang="en"] .question-footer{flex-wrap:wrap}html[lang="en"] #question-text{font-size:22px}html[lang="en"] .best-label{white-space:nowrap}.result-stats>span>span{display:inline;font:inherit;color:inherit}@media(max-width:1100px){.header-tools{gap:10px}.header-tools .header-label{display:none}nav{gap:22px}}@media(max-width:720px){header{height:auto;min-height:74px;flex-wrap:wrap;padding-top:15px;padding-bottom:15px;row-gap:17px}header>.brand{order:1}.header-tools{order:2;margin-left:auto}header>nav{order:3;width:100%;justify-content:space-between;font-size:12px;border-top:1px solid #ffffff14;padding-top:13px}header nav a:first-child{display:block}.language-switch button{padding:7px 9px;font-size:11px}html[lang="en"] .hero h1{font-size:42px;letter-spacing:-1.5px}html[lang="en"] .hero-description{font-size:13px;line-height:1.8}html[lang="en"] .film-caption b{font-size:11px}html[lang="en"] .film-caption{gap:14px}html[lang="en"] .film-number{white-space:nowrap}html[lang="en"] .fact-strip span{font-size:9px}html[lang="en"] .challenge .section-heading h2{font-size:27px}html[lang="en"] .mode b{font-size:10px}html[lang="en"] .mode small{font-size:8px}html[lang="en"] .knowledge-tab span:first-child{font-size:11px}html[lang="en"] .knowledge-content h3{font-size:23px}html[lang="en"] .game-welcome h3{font-size:23px}html[lang="en"] #question-text{font-size:19px}html[lang="en"] .answer{font-size:12px}html[lang="en"] .closing h2{font-size:25px}}
