:root{color-scheme:light;--paper:#f7f9f5;--ink:#173f36;--muted:#53685c;--green:#256149;--line:#dce4d9;--soft:#e8efdf;--white:#fffefa;--radius:16px;font-family:"Microsoft YaHei","PingFang SC",sans-serif;background:var(--paper);color:var(--ink);font-synthesis:none;scroll-behavior:smooth;scroll-padding-top:28px}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}img{display:block;max-width:100%}button,a,summary{-webkit-tap-highlight-color:transparent}a,button,summary{touch-action:manipulation}::selection{background:#d7e9c0;color:#153f30}:focus-visible{outline:3px solid #276b53;outline-offset:5px}body::-webkit-scrollbar{width:10px}body::-webkit-scrollbar-thumb{background:#bacbb8;border:2px solid var(--paper);border-radius:8px}.wrap{width:min(1240px,calc(100% - 80px));margin-inline:auto}.skip-link{position:fixed;left:16px;top:-70px;background:var(--green);color:white;padding:14px;z-index:100}.skip-link:focus{top:12px}.site-header{height:104px;display:flex;justify-content:space-between;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:22px;white-space:nowrap;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:43px;height:50px;border-radius:10px;background:var(--green);color:var(--white);font-size:36px;line-height:1;font-weight:700}.brand-caption{display:block;font-size:11px;letter-spacing:.12em;margin-top:5px;color:var(--muted);font-weight:500}nav{display:flex;align-items:center;gap:32px;font-size:14px;font-weight:600}nav>a{padding-block:12px}nav>a:hover{color:#337b56}.nav-play{border:1px solid #aac3a8;border-radius:9px;padding:12px 17px;display:flex;gap:20px;align-items:center}.hero{display:grid;grid-template-columns: .92fr 1.28fr;align-items:center;gap:36px;padding-top:48px;padding-bottom:52px}.hero-copy{padding-bottom:20px}h1{font-size:clamp(40px,4.05vw,60px);line-height:1.3;letter-spacing:-.035em;margin:0 0 24px;font-weight:850}h1 span{color:var(--green)}.hero-copy>p{font-size:16px;line-height:1.95;margin:0;color:var(--muted)}.hero-actions{display:flex;align-items:center;gap:27px;margin-top:34px}.button{min-height:54px;padding:16px 25px;display:inline-flex;gap:35px;align-items:center;justify-content:space-between;border-radius:10px;font-size:16px;font-weight:700;white-space:nowrap;transition:background .2s ease,transform .2s ease}.primary{background:var(--green);color:var(--white)}.primary:hover{background:#1b4d39;transform:translateY(-2px)}.primary:active{transform:translateY(0)}.button span{font-size:22px;line-height:1}.text-link{font-size:14px;display:inline-flex;gap:12px;align-items:center;text-decoration:underline;text-underline-offset:6px;text-decoration-color:#a8bba5}.text-link:hover{text-decoration-color:var(--green)}.hero-visual{min-width:0;transform:rotate(-1.5deg);transform-origin:center;animation:scene-arrive .7s cubic-bezier(.16,1,.3,1) both}.scene-window{aspect-ratio:800/560;position:relative;border-radius:var(--radius);overflow:hidden;background:#e4eadb;box-shadow:0 18px 32px -18px #2b47234d}.scene-window iframe{display:block;width:800px;height:560px;position:absolute;top:0;left:0;border:0;pointer-events:none;transform-origin:0 0;transform:scale(var(--scene-scale,.8))}.scene-caption{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);padding:15px 3px 0}.caption-symbol{font-size:21px;font-weight:700;color:var(--green)}.facts{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;padding-block:24px;font-size:13px;color:var(--muted)}.facts strong{font-weight:650;color:var(--ink);margin-left:5px}.section{padding-top:100px;padding-bottom:100px}.section-heading{max-width:680px;margin-bottom:46px}h2{font-size:clamp(28px,3vw,39px);letter-spacing:-.025em;line-height:1.45;margin:0 0 20px;font-weight:750}.section-heading>p,.parent-intro>p{font-size:15px;line-height:1.95;color:var(--muted);margin:0}.lesson-layout{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:80px}.lesson-demo{background:#eaf0e2;border-radius:var(--radius);padding:24px 30px 27px}.demo-tabs{display:flex;border-bottom:1px solid #cad8c2;gap:22px}.demo-tabs button{border:0;background:transparent;padding:10px 0 15px;font-size:14px;font-weight:700;color:#5c705d;border-bottom:3px solid transparent;margin-bottom:-1px}.demo-tabs button[aria-selected=true]{color:#245b42;border-color:#286346}.demo-tabs button:hover{color:#173f36}#lesson-panel>p{margin:26px 0 0;font-size:14px;color:var(--muted);line-height:1.8}.number-story{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:190px}.sum-place{text-align:center;position:relative}.sum-place span{display:block;color:var(--muted);font-size:11px;margin-bottom:5px}.sum-place strong{font-size:62px;line-height:1.2;font-weight:700}.operator{font-size:29px;color:#57745b}.demo-car{width:66px;position:relative;filter:drop-shadow(1px 5px 3px #334d3b30)}.demo-car img{width:100%;height:118px;object-fit:contain}.demo-car b{position:absolute;top:45%;left:50%;transform:translate(-50%,-50%);font-size:26px;background:#fff9e9;color:#234c3b;border-radius:4px;line-height:1.2;padding:0 4px}.demo-result{font-size:62px;color:var(--green)}.demo-status{font-size:13px;color:#315e42;padding-top:17px;border-top:1px solid #cad8c2;line-height:1.8}.steps{list-style:none;padding:0;margin:0;display:grid;gap:33px}.steps li{display:flex;gap:20px;align-items:flex-start}.step-number{flex-shrink:0;display:grid;place-items:center;width:33px;height:36px;font-size:16px;color:#3b6848;background:#e6eddc;border-radius:8px;font-weight:600}.steps h3{font-size:18px;margin:2px 0 10px;letter-spacing:-.02em}.steps p{font-size:14px;line-height:1.9;color:var(--muted);margin:0;max-width:30ch}.parents-section{background:#edf2e8}.parent-layout{display:grid;grid-template-columns:1fr 1fr;gap:100px}.parent-note{display:flex;align-items:center;gap:17px;margin-top:40px}.note-mark{width:46px;height:54px;background:#dee8d2;color:#3e704a;display:grid;place-items:center;border-radius:10px;font-size:34px;font-weight:700}.parent-note p{font-size:13px;color:var(--muted);line-height:1.9;margin:0}.parent-note strong{color:var(--ink);font-weight:600}.parent-content{display:grid;gap:28px;padding-top:5px}.parent-item h3{font-size:18px;margin:0 0 10px}.parent-item p{color:var(--muted);font-size:14px;line-height:1.95;margin:0;max-width:48ch}.faq-section{display:grid;grid-template-columns:.9fr 1.3fr;gap:72px}.faq-section h2{font-size:29px}.faq-list{margin-top:-8px}details{border-bottom:1px solid var(--line)}summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:24px;padding:23px 0;font-size:15px;font-weight:600;line-height:1.8}summary::-webkit-details-marker{display:none}summary:after{content:'+';font-size:24px;font-weight:400;color:#5c785e}details[open] summary:after{content:'−'}details p{font-size:14px;color:var(--muted);line-height:1.95;margin:0 30px 23px 0}summary:hover{color:var(--green)}.closing{display:flex;justify-content:space-between;align-items:center;gap:50px;padding:56px 64px;background:#e4edda;border-radius:var(--radius);margin-bottom:68px}.closing h2{font-size:34px;margin-bottom:15px}.closing p{font-size:14px;color:var(--muted);margin:0}.site-footer{display:flex;justify-content:space-between;gap:32px;align-items:center;padding-bottom:35px;font-size:12px;color:var(--muted)}.footer-brand{font-size:17px;font-weight:700;color:var(--ink)}.footer-brand span{display:block;margin-top:9px;font-size:12px;font-weight:400;color:var(--muted)}.site-footer>div{display:flex;gap:24px;align-items:center}.site-footer a:hover{text-decoration:underline;text-underline-offset:4px}.policy{max-width:760px;padding-block:70px}.policy h1{font-size:36px}.policy h2{font-size:23px;margin-top:38px}.policy p{font-size:15px;line-height:2;color:var(--muted)}.policy .text-link{margin-top:30px}@keyframes scene-arrive{from{transform:rotate(0deg) translateY(12px);clip-path:inset(0 0 4% 0 round 16px)}to{transform:rotate(-1.5deg);clip-path:inset(-12% -12% -12% -12% round 16px)}}
@media(min-width:1600px){.hero{padding-top:65px;padding-bottom:65px}}
@media(max-width:1050px){.wrap{width:calc(100% - 48px)}.hero{gap:28px;grid-template-columns:.95fr 1.05fr}.hero-copy>p{font-size:14px}.hero-actions{gap:18px}.hero-actions .button{gap:25px;padding:15px 20px}.hero-actions .text-link{font-size:12px;gap:6px}.lesson-layout{gap:42px}.parent-layout{gap:65px}.faq-section{gap:40px}.facts{font-size:12px}.closing{padding:45px}.section{padding-block:75px}}
@media(max-width:767px){.wrap{width:calc(100% - 40px)}.site-header{height:86px;gap:14px}.brand{font-size:19px;gap:9px}.brand-mark{width:35px;height:42px;font-size:31px}.brand-caption{font-size:11px;letter-spacing:.04em}nav{gap:16px;font-size:12px}nav>a:not(.nav-play){display:none}.nav-play{padding:10px 12px;gap:10px;border-radius:8px}.hero{grid-template-columns:1fr;padding-top:32px;padding-bottom:32px;gap:33px}.hero-copy{padding-bottom:0}h1{font-size:clamp(38px,8.9vw,60px);line-height:1.3;margin-bottom:19px;letter-spacing:-.035em}.hero-copy>p{font-size:14px;line-height:1.95}.hero-actions{margin-top:25px;gap:25px}.hero-actions .text-link{font-size:13px}.hero-visual{margin:0 4px 0 0;transform:rotate(-1deg)}.scene-caption{font-size:11px;padding-top:11px}.facts{display:grid;grid-template-columns:1fr 1fr;gap:17px 16px;padding-block:22px;font-size:11px}.facts strong{margin-left:3px}.section{padding-block:61px}.section-heading{margin-bottom:30px}h2{font-size:29px;line-height:1.45;margin-bottom:15px}.section-heading>p,.parent-intro>p{font-size:14px}.desktop-break{display:none}.lesson-layout{grid-template-columns:1fr;gap:33px}.lesson-demo{padding:18px 22px 23px}.demo-tabs{gap:23px}.demo-tabs button{font-size:12px}#lesson-panel>p{font-size:12px;margin-top:20px}.number-story{min-height:170px;gap:8px}.sum-place strong,.demo-result{font-size:52px}.demo-car{width:59px}.demo-car img{height:103px}.demo-car b{font-size:24px}.operator{font-size:25px}.demo-status{font-size:12px}.steps{gap:25px}.steps h3{font-size:17px;margin-bottom:7px}.steps p{font-size:13px;max-width:none}.steps li{gap:16px}.parent-layout{grid-template-columns:1fr;gap:35px}.parent-note{margin-top:25px}.parent-content{gap:23px}.parent-item h3{font-size:17px}.parent-item p{font-size:13px}.faq-section{grid-template-columns:1fr;gap:12px}.faq-section h2{font-size:27px}.faq-list{margin:0}summary{font-size:14px;padding-block:19px}details p{font-size:13px;margin-right:15px}.closing{flex-direction:column;align-items:flex-start;gap:26px;padding:31px 25px;margin-bottom:42px}.closing h2{font-size:27px}.closing p{font-size:13px}.closing .button{font-size:14px;padding:14px 20px;min-height:50px}.site-footer{flex-direction:column;align-items:flex-start;gap:25px;font-size:11px;padding-bottom:26px}.site-footer>div{width:100%;justify-content:space-between;gap:12px}.footer-brand{font-size:16px}.footer-brand span{font-size:11px}.policy{padding-top:40px}.policy h1{font-size:30px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.hero-visual{transform:none}}