@font-face{font-family:Mathink;src:url(../assets/cjk.woff2) format("woff2");font-weight:400;font-display:swap}@font-face{font-family:Mathink;src:url(../assets/cjk-bold.woff2) format("woff2");font-weight:700;font-display:swap}@font-face{font-family:Grotesk;src:url(../assets/grotesk.woff2) format("woff2");font-weight:100 900;font-display:swap}@font-face{font-family:Formula;src:url(../assets/mono.woff2) format("woff2");font-display:swap}:root{--ink:#131b1c;--paper:#f5f3ed;--green:#d8e2c1;--muted:#626960;--coral:#ed805e;--line:#d5d7cc;--dark-line:#3c4947;--ease:cubic-bezier(.22,.68,0,1.05)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Mathink,Microsoft YaHei,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}body:has(dialog[open]){overflow:hidden}button,input,textarea{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{color:inherit}a{color:inherit;text-decoration:none}button{border:0}a,button{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #d8764f;outline-offset:5px}::selection{background:var(--coral);color:var(--ink)}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:700;line-height:1.35}h2{font-size:clamp(32px,3.1vw,48px);letter-spacing:-1.6px}p{color:var(--muted)}svg{display:block}button svg,a svg{width:23px;height:23px;flex:0 0 auto}.mono{font-family:Formula,monospace;font-size:11px;letter-spacing:1.25px}.section-pad{padding:106px max(6.25vw,24px)}.skip-link{position:fixed;top:12px;left:12px;z-index:120;background:var(--paper);padding:10px 20px;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.site-nav{height:85px;position:fixed;top:0;left:0;width:100%;z-index:30;color:var(--paper);border-bottom:1px solid #46544e55;transition:background .35s,box-shadow .35s}.site-nav.scrolled{background:#131b1cf5;box-shadow:0 6px 25px #131b1c0a}.nav-inner{height:100%;display:flex;align-items:center;padding:0 max(4.8vw,24px);gap:40px}.brand{font-family:Grotesk,sans-serif;font-size:33px;line-height:1;font-weight:600;letter-spacing:-1.15px;white-space:nowrap}.brand span{color:var(--coral)}.nav-links{display:flex;gap:32px;margin:auto;align-items:center;font-size:13px}.nav-links>a{position:relative;display:flex;gap:7px;align-items:center;padding:12px 0}.nav-links>a:after{content:"";position:absolute;left:0;bottom:5px;right:0;height:1px;background:var(--coral);transform:scaleX(0);transform-origin:left;transition:transform .3s}.nav-links>a:hover:after{transform:scaleX(1)}.tiny-dot{display:block;width:5px;height:5px;border-radius:50%;background:var(--green)}.nav-contact{display:flex;align-items:center;gap:21px;padding:11px 17px;background:transparent;border:1px solid #9da99b66;border-radius:4px;white-space:nowrap;font-size:12px;transition:background .25s,color .25s}.nav-contact:hover{background:var(--paper);color:var(--ink)}.nav-contact svg{width:18px;height:18px}.menu-toggle{display:none}.scroll-progress{position:absolute;bottom:-1px;height:2px;width:100%;background:var(--coral);transform:scaleX(0);transform-origin:left}.hero{position:relative;min-height:780px;height:min(970px,100svh);color:var(--paper);background:var(--ink);overflow:hidden;display:flex;align-items:center}.hero-grid{position:absolute;inset:0;background-image:linear-gradient(90deg,#5b776914 1px,transparent 1px);background-size:16.666% 100%;pointer-events:none;-webkit-mask-image:linear-gradient(#0000,#000 40%,#0000);mask-image:linear-gradient(#0000,#000 40%,#0000)}.hero-content{position:relative;padding:115px 0 80px max(6.25vw,24px);width:52%;z-index:3;pointer-events:none}.hero-content a,.hero-content button{pointer-events:auto}.hero-kicker{font:11px Formula,monospace;letter-spacing:2px;display:flex;align-items:center;gap:12px;color:#c0c9b9;margin-bottom:32px}.hero-kicker>span{width:6px;height:6px;border-radius:50%;background:var(--coral)}.hero-title{font-size:clamp(56px,5.7vw,86px);letter-spacing:-4px;line-height:1.37;font-weight:700}.hero-line{display:block}.muted-hero{color:#acbba6}.thinking-word{position:relative;display:inline-block;color:var(--green)}.thinking-word svg{position:absolute;bottom:-2px;left:0;width:100%;height:14px;color:var(--coral)}.hero-description{font-size:16px;line-height:1.9;color:#b7c0b4;margin-top:30px}.hero-actions{display:flex;align-items:center;gap:30px;margin-top:38px}.button{display:inline-flex;justify-content:center;align-items:center;gap:36px;padding:16px 22px;min-height:54px;border-radius:4px;font-size:13px;font-weight:700;white-space:nowrap;transition:background .25s,transform .25s,box-shadow .25s}.button:hover{transform:translateY(-3px);box-shadow:0 8px 20px #00000012}.button:active{transform:translateY(0)}.button svg{transition:transform .25s}.button:hover svg{transform:translate(4px)}.button.coral{background:var(--coral);color:#142020}.button.coral:hover{background:#f79878}.button.light{background:var(--paper);color:var(--ink)}.button.light:hover{background:#e2eccf}.button.dark{background:var(--ink);color:var(--paper)}.button.dark:hover{background:#2c4240}.film-link{background:none;color:var(--paper);display:flex;align-items:center;gap:12px;text-align:left;font-size:12px;padding:0}.film-link small{display:block;font-size:10px;letter-spacing:1px;color:#adbaac;margin-top:3px}.play-ring{width:40px;height:40px;border:1px solid #8a9a8155;border-radius:50%;display:grid;place-items:center;transition:background .3s,border-color .3s}.play-ring svg{width:18px;height:18px}.film-link:hover .play-ring{background:#ffffff17;border-color:var(--paper)}.hero-foot{display:flex;flex-direction:column;gap:6px;margin-top:50px;color:#849482;font-size:11px}.hero-foot .mono{font-size:10px;letter-spacing:1.4px;color:#bcc8b4}.hero-art{position:absolute;right:-4%;top:8%;width:61%;height:88%;isolation:isolate}.hero-scene,.scene-loading{width:100%;height:100%;cursor:grab;touch-action:pan-y}.hero-scene.dragging{cursor:grabbing}.hero-scene canvas{display:block;position:absolute;inset:0;z-index:1}.scene-placeholder{position:absolute;inset:10%;width:80%;height:80%;opacity:.5;transition:opacity .3s}.scene-ready .scene-placeholder{opacity:0}.scene-fallback .scene-placeholder{opacity:1}.art-coordinate{position:absolute;font:9px Formula,monospace;letter-spacing:1.6px;color:#a4b29a;pointer-events:none;z-index:2}.coordinate-top{top:13%;left:26%}.coordinate-bottom{bottom:15%;right:19%;font-family:Mathink;font-size:11px;letter-spacing:1px}.scene-controls{position:absolute;bottom:7%;left:50%;transform:translate(-50%);z-index:3;display:flex;gap:0;border:1px solid #a6b49640;border-radius:4px;background:#131b1cb0;overflow:hidden}.scene-controls button{color:#c3cdbc;padding:9px 19px;background:none;font-size:11px;white-space:nowrap;transition:background .25s}.scene-controls button span{font:9px Formula;letter-spacing:.5px;margin-right:7px;color:#84947c}.scene-controls button.active{color:var(--ink);background:var(--green)}.scene-controls button.active span{color:#4e6052}.drag-hint{position:absolute;bottom:1.7%;left:50%;transform:translate(-50%);font-size:10px;color:#8b9b89;letter-spacing:1px;white-space:nowrap}.scroll-cue{position:absolute;bottom:35px;left:max(6.25vw,24px);display:flex;align-items:center;gap:19px;font-size:11px;color:#bdc9b6;letter-spacing:1px;z-index:3}.scroll-cue svg{width:13px;height:26px}.belief-strip{min-height:112px;padding:25px max(6.25vw,24px);display:flex;align-items:center;justify-content:space-between;gap:25px;border-bottom:1px solid var(--line);font-size:18px;background:#edece3;letter-spacing:.5px}.belief-em{color:#4f6857}.belief-strip .mono{font-size:10px;color:#687265;white-space:nowrap}.section-label{display:flex;align-items:center;gap:17px;font:10px Formula,monospace;letter-spacing:1.8px;margin-bottom:26px;color:#65715f}.section-label>span{font-size:11px;letter-spacing:0;border:1px solid #a2ab9688;width:24px;height:24px;display:grid;place-items:center;border-radius:50%}.method-intro{display:grid;grid-template-columns:1fr 1fr;gap:0 60px}.method-intro .section-label{grid-column:1/-1}.method-intro>p{font-size:15px;line-height:2;align-self:end;padding-bottom:5px}.method-body{margin-top:60px;display:grid;grid-template-columns:.92fr 1.08fr;gap:78px;align-items:center}.method-tabs{border-top:1px solid var(--line)}.method-tab{padding:29px 0;width:100%;border-bottom:1px solid var(--line);background:none;text-align:left;display:grid;grid-template-columns:30px 1fr 20px;gap:16px;align-items:start}.tab-no{font:11px Formula;color:#858b7d;margin-top:6px}.method-tab h3{font-size:20px;letter-spacing:-.5px;color:#737a6c;transition:color .25s}.method-tab p{font-size:13px;line-height:1.95;margin-top:13px;max-width:340px;color:#717b6e}.tab-plus{font-family:Grotesk;font-size:24px;line-height:1.2;font-weight:300;color:#87917f}.method-tab.selected h3{color:var(--ink)}.method-tab.selected .tab-no,.method-tab.selected .tab-plus{color:#b95635}.method-tab.selected{border-bottom-color:#798e68}.method-tab:hover h3{color:#b75e3f}.math-demo{background:#e8ebde;border:1px solid #d3d9c8;border-radius:9px;padding:25px 30px 22px;min-width:0;position:relative;box-shadow:0 28px 50px -45px #35452f88}.demo-head{display:flex;align-items:center;justify-content:space-between;color:#536247;font-size:11px;gap:16px}.live-dot{display:flex;align-items:center;gap:6px;font-size:10px;white-space:nowrap}.live-dot:before{content:"";width:5px;height:5px;border-radius:50%;background:#6b8059}.demo-equation{font-family:Grotesk,Mathink,sans-serif;text-align:center;font-size:25px;letter-spacing:1px;margin-top:25px}.demo-equation>span{color:#a3482d}.array-svg{width:100%;height:265px;margin:10px 0;overflow:visible}.block{transform-box:fill-box;transform-origin:center;transition:opacity .55s,transform .55s,fill .25s}.block.first{fill:#758e67;stroke:#647e56;stroke-width:1}.block.second{fill:#d08f6f;stroke:#b17659;stroke-width:1}.demo-result{display:flex;align-items:center;justify-content:center;gap:9px;font-size:11px;min-height:26px}.demo-result strong{font:17px Grotesk,Mathink;letter-spacing:.6px;margin-left:7px}.legend-dot{display:inline-block;width:8px;height:8px;background:#758e67;border-radius:2px}.legend-dot.coral{background:#d08f6f}.demo-range{display:flex;gap:15px;align-items:center;margin-top:25px;padding-top:20px;border-top:1px solid #c9d0ba;font-size:11px}.demo-range label{white-space:nowrap}.demo-range input{flex:1;min-width:40px;accent-color:#607e51;height:5px;cursor:pointer}.demo-range output{width:25px;font:17px Grotesk;text-align:right}.demo-hint{margin-top:18px;font-size:11px;min-height:44px;line-height:1.9;color:#56634d}.courses-section{color:var(--paper);background:var(--ink);padding-top:100px;padding-bottom:62px}.courses-section .section-label{color:#acbba4}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:55px}.section-heading>p{color:#a7b4a1;font-size:13px;line-height:2;max-width:400px;padding-bottom:8px}.course-tabs{display:flex;gap:40px;margin-top:52px;border-bottom:1px solid var(--dark-line)}.course-tabs button{min-width:180px;display:flex;align-items:center;gap:45px;padding:17px 0;color:#a7b5a1;background:none;position:relative;font-size:14px}.course-tabs button span{font:10px Formula;color:#8a9c85}.course-tabs button:after{content:"";position:absolute;bottom:-1px;width:100%;left:0;height:2px;background:var(--green);transform:scaleX(0);transform-origin:left;transition:transform .35s}.course-tabs button.active{color:var(--green)}.course-tabs button.active:after{transform:scaleX(1)}.course-panel{display:grid;grid-template-columns:1.14fr 1fr;gap:90px;padding-top:53px;min-height:475px}.course-info,.course-art{animation:soft-enter .55s ease both}.course-english{color:#a8bb9a;font-size:10px}.course-info h3{font-size:32px;letter-spacing:-1px;margin-top:17px}.course-info>p{font-size:14px;color:#afbaa7;max-width:530px;line-height:1.95;margin-top:21px}.course-meta{display:grid;grid-template-columns:repeat(3,1fr);margin-top:31px;padding-top:23px;border-top:1px solid var(--dark-line);gap:20px}.course-meta span{display:block;color:#8fa088;font-size:10px;margin-bottom:8px}.course-meta strong{font-weight:400;font-size:14px}.course-actions{display:flex;align-items:center;gap:26px;margin-top:33px}.course-actions .button{font-size:12px;min-height:48px;padding:13px 20px;gap:35px}.text-link{display:inline-flex;align-items:center;gap:12px;border:0;background:none;color:#d6e1c9;font-size:12px;padding:9px 0;white-space:nowrap}.text-link svg{width:18px;height:18px;transition:transform .25s}.text-link:hover svg{transform:translate(3px,-2px)}.course-art{border-left:1px solid var(--dark-line);padding-left:45px;display:flex;flex-direction:column;justify-content:space-between;min-width:0}.course-shape{width:100%;height:335px;max-width:500px}.course-shape text{font:14px Formula;fill:#a9b79c}.course-shape .shape-caption{font-size:9px;letter-spacing:1.25px}.course-geometry{transform-origin:center;animation:geometry-float 9s ease-in-out infinite alternate}.course-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:10px 0 15px;color:#a6b898;font-size:11px}.course-num{font:60px Grotesk;color:#68805f;line-height:1;font-weight:200}.course-note{font-size:10px;text-align:left;color:#9bac91;margin-top:35px;border-top:1px solid var(--dark-line);padding-top:22px}.founder-section{display:grid;grid-template-columns:.85fr 1.15fr;gap:110px;align-items:center}.founder-profile{max-width:490px}.founder-monogram{aspect-ratio:1/.99;background:#dfe4d6;position:relative;overflow:hidden;display:grid;place-items:center;color:#677a5d}.founder-monogram>span:first-child{font:195px Grotesk;letter-spacing:-10px;color:#9eae8f;font-weight:300;opacity:.9}.founder-monogram>svg{position:absolute;inset:8%;width:84%;height:84%;stroke-width:.8}.founder-monogram>.mono{position:absolute;bottom:24px;left:27px;font-size:9px;letter-spacing:1.1px}.founder-name{margin-top:27px}.founder-name h3{font-size:22px}.founder-name h3>span{font-family:Grotesk,Mathink;font-size:15px;font-weight:400;color:#718166;margin-left:10px}.founder-name p{font-size:12px;margin-top:7px}.founder-story h2{font-size:39px}.founder-story blockquote{margin:24px 0;font-size:23px;font-weight:400;line-height:1.7;color:#51634b;letter-spacing:-.5px}.founder-story>p{font-size:13px;line-height:2;max-width:535px;margin-top:12px}.founder-credentials{display:flex;flex-wrap:wrap;gap:0 18px;border-top:1px solid var(--line);padding-top:21px;margin-top:29px;max-width:540px}.founder-credentials>span{font-size:10px;color:#637258}.founder-story .dark-link{color:#33492d;font-size:12px;margin-top:22px}.future-section{background:#1b2c29;color:var(--paper);display:grid;grid-template-columns:1fr 1fr;gap:90px;align-items:center}.future-section .section-label{color:#b0c5a3}.exploration-badge{display:flex;align-items:center;gap:8px;font-size:10px;color:#b4c7a2;margin:22px 0}.exploration-badge>span{width:5px;height:5px;background:#b4c7a2;border-radius:50%}.future-copy h2{font-size:39px}.future-copy p{margin-top:24px;font-size:13px;color:#b0c0aa;line-height:2}.future-copy>.text-link{margin-top:30px}.guide-demo{background:#f1f2e9;color:var(--ink);border-radius:8px;overflow:hidden;border:1px solid #839478;box-shadow:0 40px 65px -48px #030c0999;min-width:0}.guide-top{display:flex;align-items:center;gap:13px;border-bottom:1px solid #d8decf;padding:20px 23px}.guide-mark{font:32px Grotesk;color:#384e36;background:#e0e6d5;padding:0 9px;line-height:1.45;border-radius:5px}.guide-mark>span{color:#c67958}.guide-top strong{font-size:12px;font-weight:700;display:block}.guide-top div>span{font-size:9px;color:#637359;display:block;margin-top:3px}.guide-status{font:8px Formula;margin-left:auto;color:#667559;letter-spacing:1.2px}.guide-conversation{min-height:280px;padding:25px 23px 5px;display:flex;flex-direction:column;align-items:flex-end;gap:20px}.student-question{padding:12px 17px;font-size:12px;background:#dce6cf;border-radius:7px 7px 0;animation:soft-enter .35s ease}.guide-response{display:flex;gap:13px;align-self:stretch;animation:soft-enter .45s ease}.mini-mark{font:17px Grotesk;color:#57734a;line-height:1.5}.guide-response>p{color:#34442f;font-size:13px;line-height:2;margin-top:0}.prompt-label{font-size:10px;color:#68785e;margin:14px 23px 10px}.prompt-options{display:flex;flex-direction:column;margin:0 23px 23px;border-top:1px solid #d2dac8}.prompt-options>button{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#526349;padding:10px 0;background:none;border-bottom:1px solid #d2dac8;text-align:left;gap:15px;transition:color .2s,padding .2s}.prompt-options>button.selected{color:#ab5132}.prompt-options>button:hover{padding-left:5px;color:#ab5132}.mini-exercise{align-self:stretch;display:grid;grid-template-columns:76px 1fr;align-items:center;gap:7px;font-size:11px;margin-top:-3px}.mini-exercise>div{display:flex;border:1px solid #b9c8ad;border-radius:3px;overflow:hidden}.mini-exercise input{width:100%;min-width:0;padding:8px 10px;border:0;background:#fafaf4;font-size:12px}.mini-exercise button{background:#d5e3c6;padding:5px 10px}.mini-exercise button svg{width:17px;height:17px}.mini-exercise>p{grid-column:1/-1;font-size:11px;color:#826043;line-height:1.7;min-height:19px}.faq-section{display:grid;grid-template-columns:1fr 1.13fr;gap:70px}.faq-title h2{font-size:34px}.faq-list{border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-item h3 button{background:none;display:flex;width:100%;align-items:center;justify-content:space-between;text-align:left;gap:20px;font-size:14px;font-weight:400;padding:23px 0;line-height:1.8}.faq-item h3 button>span{font:24px Grotesk;color:#748b65}.faq-item.open h3 button{color:#526d46}.faq-answer>p{padding:0 32px 24px 0;font-size:12px;line-height:2.05}.final-cta{position:relative;overflow:hidden;background:#dce5cf;padding-top:90px;padding-bottom:95px}.final-cta>.reveal{position:relative;z-index:2}.final-cta .mono{font-size:10px;letter-spacing:1.4px;color:#617454}.final-cta h2{margin-top:25px;font-size:45px}.final-cta p{font-size:13px;margin-top:22px;color:#59694f}.final-cta .button{margin-top:32px;gap:55px}.cta-orbit{position:absolute;right:0;top:0;bottom:0;width:52%;display:flex;align-items:center;justify-content:center;color:#9fae8d;animation:geometry-float 15s ease-in-out infinite alternate}.cta-orbit>svg{width:100%;max-height:500px;stroke-width:1}.site-footer{background:var(--ink);color:var(--paper);padding-top:56px;padding-bottom:27px;overflow:hidden}.footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:40px}.footer-top .brand{font-size:30px}.footer-top p{font-size:11px;margin-top:15px;color:#9daa93}.footer-links{display:flex;gap:31px;font-size:11px;color:#b1bda7;padding-top:8px}.footer-links button{background:none;padding:0;font-size:11px;color:inherit}.footer-links>*:hover{color:var(--coral)}.footer-large{font-family:Grotesk,sans-serif;font-size:12.5vw;line-height:1.25;letter-spacing:-.05em;color:#455649;font-weight:300;margin:40px 0 24px;white-space:nowrap}.footer-large>span{color:#a4b397}.footer-bottom{border-top:1px solid #3e4c40;display:flex;justify-content:space-between;gap:30px;padding-top:22px;color:#9eac94;font-size:9px}.footer-bottom>div{display:flex;gap:25px;align-items:center;flex-wrap:wrap}.footer-bottom button{font-size:9px;color:inherit;background:none;padding:0}.motion-toggle{display:flex;align-items:center;gap:7px}.motion-icon{width:9px;height:10px;border-left:2px solid #a7b59b;border-right:2px solid #a7b59b;display:block}.motion-icon.paused{border:0;border-top:5px solid transparent;border-bottom:5px solid transparent;border-left:8px solid #a7b59b;width:8px;height:10px}.modal{border:1px solid #a7b59a;border-radius:10px;padding:0;width:min(600px,calc(100% - 32px));max-height:calc(100svh - 48px);color:var(--ink);background:var(--paper);box-shadow:0 30px 100px #0006;overscroll-behavior:contain}.modal::backdrop{background:#08110ede;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.modal-inner{padding:42px 43px 34px;position:relative}.modal-close{position:absolute;right:15px;top:14px;background:#dbe2d2;color:#263722;border-radius:50%;width:34px;height:34px;display:grid;place-items:center;z-index:3}.modal-close svg{width:18px;height:18px}.modal-kicker{font:9px Formula;letter-spacing:1.25px;color:#6d7e61;display:block;padding-right:20px;margin-bottom:20px}.modal h2{font-size:30px;letter-spacing:-1px}.modal-inner>p{font-size:12px;line-height:1.9;margin-top:18px}.modal fieldset{border:0;padding:0;margin:25px 0}.modal legend{font-size:12px;font-weight:700;margin-bottom:12px}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.choice-grid button,.choice-list button{background:#e6eadd;color:#596b4f;border:1px solid #d1d9c6;border-radius:4px;min-height:43px;padding:10px 12px;font-size:12px;text-align:center}.choice-grid button.chosen,.choice-list button.chosen{border-color:#718b5f;color:#253e1c;background:#dce8cc;box-shadow:inset 0 0 0 1px #718b5f}.choice-list{display:flex;flex-direction:column;gap:9px}.choice-list button{display:flex;justify-content:space-between;align-items:center;text-align:left}.wide{width:100%;justify-content:space-between;margin-top:5px}.modal .modal-footnote{font-size:10px;text-align:center;color:#6d7a62;margin-top:13px}.plan-result{margin-top:26px;padding:24px 0;border-top:1px solid #cbd4bf;border-bottom:1px solid #cbd4bf}.plan-result>span{font-size:10px;color:#647856}.plan-result h3{font-size:19px;line-height:1.6;margin-top:14px}.plan-result p{font-size:13px;line-height:2;margin-top:12px}.plan-result small{display:block;font-size:10px;color:#6e7b63;margin-top:15px}.modal-contact{margin-top:26px}.modal-contact>p{font-size:11px;color:#66785c;margin-bottom:10px}.modal-contact>div{display:flex;align-items:center;justify-content:space-between;gap:20px}.wechat-number{font:24px Grotesk;letter-spacing:.6px;-webkit-user-select:all;user-select:all}.modal-contact .button{font-size:11px;padding:11px 14px;min-height:44px;gap:13px}.modal-contact .button svg{width:18px;height:18px}.copy-brief{font-size:11px;background:none;color:#546c44;padding:12px 0;border-bottom:1px solid #aabd97;margin-top:13px}.copy-status{font-size:11px!important;min-height:21px;color:#486036!important;margin-top:14px!important}.back-choice{font-size:11px;color:#6c7c60;background:none;padding:4px 0;margin-top:9px}.syllabus{margin-top:25px}.syllabus>div{display:flex;gap:18px;border-top:1px solid #d2d9c8;padding:19px 0}.syllabus>div>span{font:11px Formula;color:#869577;padding-top:3px}.syllabus h3{font-size:14px}.syllabus p{font-size:12px;line-height:1.95;margin-top:8px}.video-modal{width:min(1100px,calc(100% - 24px));border:1px solid #5b6e56;background:#0c0e12;overflow:hidden}.video-modal .modal-inner{padding:0}.video-modal video{display:block;width:100%;height:auto;max-height:calc(100svh - 50px)}.video-modal .modal-close{background:#f5f3eddd}@keyframes soft-enter{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes geometry-float{0%{transform:translateY(-3px) rotate(-1deg)}to{transform:translateY(3px) rotate(1deg)}}.reduced-motion,.reduced-motion *{scroll-behavior:auto!important}.reduced-motion *{animation:none!important;transition-duration:.01ms!important}@media(min-width:1800px){.section-pad{padding-left:calc((100vw - 1560px)/2);padding-right:calc((100vw - 1560px)/2)}.hero-content{padding-left:calc((100vw - 1560px)/2)}.hero-art{right:3%;width:53%}.hero-title{font-size:95px}.nav-inner{padding-left:calc((100vw - 1660px)/2);padding-right:calc((100vw - 1660px)/2)}}@media(max-width:1150px){.nav-inner{gap:25px}.nav-links{gap:21px;font-size:12px}.nav-contact{font-size:11px;padding:10px 12px;gap:12px}.hero-title{font-size:61px;letter-spacing:-3px}.hero-actions{gap:20px}.hero-actions .button{gap:20px;padding:15px 17px}.hero-content{width:57%}.hero-art{right:-8%;width:62%}.method-body{gap:38px}.course-panel{gap:45px}.course-art{padding-left:25px}.course-actions{gap:18px;flex-wrap:wrap}.founder-section{gap:60px}.future-section{gap:50px}.founder-monogram>span:first-child{font-size:165px}.future-copy h2{font-size:34px}.guide-top{padding:18px}.guide-status{display:none}.faq-section{gap:45px}.section-heading>p{max-width:340px}}@media(max-width:900px){.site-nav{height:75px}.nav-inner{justify-content:space-between}.brand{font-size:30px}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:6px;align-items:center;width:40px;height:40px;background:none}.menu-toggle>span{width:21px;height:1px;background:var(--paper);display:block}.menu-toggle>span.cross{transform:rotate(-35deg)}.nav-contact{margin-left:auto}.nav-links{display:none}.nav-links.menu-open{display:flex;position:absolute;left:0;right:0;top:75px;padding:24px;background:var(--ink);margin:0;border-bottom:1px solid #71836366;flex-direction:column;align-items:stretch;font-size:15px;gap:8px;box-shadow:0 20px 35px #0003}.nav-links.menu-open>a{padding:11px 10px}.hero{min-height:760px;max-height:900px}.hero-title{font-size:55px}.hero-content{padding-left:5vw;width:56%}.hero-description{font-size:14px}.hero-actions{align-items:flex-start;flex-direction:column;gap:20px}.hero-actions .button{padding:13px 18px;min-height:48px}.hero-kicker{font-size:9px;letter-spacing:1.25px}.hero-art{right:-11%;width:68%;top:13%;height:77%}.hero-foot{margin-top:28px}.coordinate-top{left:34%;top:10%;font-size:8px}.coordinate-bottom{right:20%;font-size:10px}.scene-controls button{padding:8px 13px}.drag-hint{font-size:9px}.belief-strip{font-size:15px}.belief-strip .mono{display:none}.section-pad{padding-top:82px;padding-bottom:82px}.method-body{gap:30px}.method-tab{grid-template-columns:23px 1fr 16px;gap:9px;padding:25px 0}.method-tab h3{font-size:17px}.method-tab p{font-size:12px}.math-demo{padding:21px 20px}.demo-head{font-size:10px}.demo-equation{font-size:22px}.array-svg{height:240px}.method-intro{gap:20px}.method-intro>p{font-size:13px}.section-heading{gap:30px}.section-heading>p{font-size:12px;max-width:300px}.course-tabs{gap:25px}.course-tabs button{min-width:135px;font-size:12px;gap:20px}.course-panel{gap:35px;grid-template-columns:1.2fr 1fr}.course-info h3{font-size:27px}.course-info>p{font-size:12px}.course-meta{gap:12px}.course-meta strong{font-size:12px}.course-shape{height:310px}.course-num{font-size:44px}.course-bottom>span:first-child{font-size:10px}.founder-section{gap:42px}.founder-monogram>span:first-child{font-size:140px}.founder-monogram>.mono{font-size:7px;left:17px}.founder-story h2{font-size:32px}.founder-story blockquote{font-size:21px}.founder-story>p{font-size:12px}.founder-credentials{gap:8px 12px}.founder-credentials>span{font-size:9px}.future-section{gap:30px}.future-copy h2{font-size:31px}.future-copy p{font-size:12px}.guide-top strong{font-size:11px}.guide-top div>span{font-size:8px}.guide-conversation{padding:22px 18px 5px;min-height:305px}.guide-response{gap:9px}.guide-response>p{font-size:12px}.prompt-options{margin:0 18px 20px}.faq-title h2{font-size:29px}.faq-section{gap:30px}.faq-item h3 button{font-size:12px}.faq-answer>p{font-size:11px}.final-cta h2{font-size:40px}.footer-links{gap:21px}.footer-bottom{font-size:8px}.footer-bottom>div{gap:17px}.footer-bottom button{font-size:8px}}@media(max-width:650px){html{scroll-padding-top:70px}.site-nav{height:70px}.nav-inner{padding:0 22px;gap:15px}.brand{font-size:29px}.nav-contact{font-size:10px;padding:9px 11px;gap:10px}.nav-contact svg{width:15px;height:15px}.menu-toggle{width:28px;height:36px;padding:0}.nav-links.menu-open{top:70px}.hero{min-height:0;height:auto;max-height:none;display:block}.hero-content{padding:141px 24px 0;width:100%;pointer-events:auto}.hero-kicker{font-size:9px;margin-bottom:23px;letter-spacing:1.5px}.hero-title{font-size:54px;letter-spacing:-2.4px;line-height:1.33}.hero-description{font-size:14px;line-height:1.9;margin-top:27px}.hero-actions{flex-direction:row;align-items:center;gap:22px;margin-top:28px}.hero-actions .button{font-size:11px;gap:18px;padding:12px 16px;min-height:48px}.film-link{font-size:10px;gap:9px}.film-link small{font-size:8px;letter-spacing:.6px}.play-ring{width:34px;height:34px}.hero-foot{margin-top:26px;gap:5px;font-size:10px}.hero-foot .mono{font-size:8px}.hero-art{position:relative;right:auto;top:auto;width:calc(100% + 40px);height:442px;margin:0 -20px 76px}.hero-scene{height:100%}.coordinate-top{left:30%;top:5%;font-size:8px;letter-spacing:1px}.coordinate-bottom{bottom:14%;right:26%;font-size:9px}.scene-controls{bottom:3%}.scene-controls button{font-size:10px;padding:8px 17px}.drag-hint{display:none}.scroll-cue{left:24px;bottom:27px;font-size:10px}.scroll-cue svg{height:23px}.belief-strip{padding:25px 24px;min-height:95px;display:block;font-size:14px;line-height:2}.belief-em{display:block}.section-pad{padding:72px 24px}.section-label{font-size:9px;letter-spacing:1.3px;gap:12px;margin-bottom:24px}.section-label>span{font-size:10px;width:22px;height:22px}h2{font-size:31px;letter-spacing:-1px}.method-intro{display:block}.method-intro>p{font-size:12px;margin-top:23px}.method-body{margin-top:32px;display:flex;flex-direction:column;gap:30px}.method-tabs{width:100%}.method-tab{padding:22px 0;grid-template-columns:22px 1fr 16px;gap:12px}.method-tab h3{font-size:18px}.method-tab p{font-size:12px;line-height:1.9;max-width:none;margin-top:10px}.method-tab:not(.selected) p{display:none}.math-demo{width:100%;padding:21px 20px}.demo-head{font-size:10px}.demo-equation{font-size:23px;margin-top:24px}.array-svg{height:243px;margin:5px 0 10px}.demo-result{font-size:10px}.demo-result strong{font-size:15px}.demo-hint{font-size:10px;margin-top:15px;min-height:39px}.demo-range{margin-top:20px;padding-top:17px}.section-heading{display:block}.section-heading>p{font-size:12px;margin-top:24px;max-width:none}.course-tabs{gap:22px;margin-top:27px;justify-content:space-between}.course-tabs button{font-size:11px;gap:9px;min-width:0;padding:15px 0;flex:1;justify-content:space-between}.course-tabs button span{font-size:8px}.course-panel{display:flex;flex-direction:column;gap:29px;padding-top:32px;min-height:0}.course-english{font-size:9px}.course-info h3{font-size:27px;margin-top:15px}.course-info>p{font-size:12px;line-height:2;margin-top:18px}.course-meta{margin-top:23px;padding-top:19px}.course-meta span{font-size:9px}.course-meta strong{font-size:12px}.course-actions{margin-top:26px;gap:20px;flex-wrap:nowrap}.course-actions .button{font-size:11px;gap:20px;min-height:45px;padding:11px 16px}.course-actions .text-link{font-size:10px;gap:8px}.course-actions .text-link svg{width:14px;height:14px}.course-art{border-left:0;border-top:1px solid var(--dark-line);padding:20px 0 0}.course-shape{height:290px}.course-bottom{padding:5px 0 0}.course-bottom>span:first-child{font-size:10px}.course-note{font-size:9px;margin-top:24px;padding-top:18px}.founder-section{display:flex;flex-direction:column;align-items:stretch;gap:40px}.founder-profile{width:100%;max-width:none;display:grid;grid-template-columns:140px 1fr;gap:20px;align-items:center}.founder-monogram{aspect-ratio:1/1.15}.founder-monogram>span:first-child{font-size:86px;letter-spacing:-5px}.founder-monogram>.mono{font-size:5px;bottom:13px;left:12px;letter-spacing:.1px}.founder-name{margin:0}.founder-name h3{font-size:20px}.founder-name h3>span{display:block;margin:5px 0 0;font-size:13px}.founder-name p{font-size:10px;margin-top:10px}.founder-story h2{font-size:31px}.founder-story blockquote{font-size:23px;margin:24px 0}.founder-story>p{font-size:12px;max-width:none;line-height:2.1}.founder-credentials{padding-top:20px;margin-top:25px;gap:8px 13px}.founder-credentials>span{font-size:9px}.founder-story .dark-link{margin-top:20px;font-size:11px}.future-section{display:flex;flex-direction:column;align-items:stretch;gap:35px}.future-copy h2{font-size:31px}.future-copy p{font-size:12px}.future-copy>.text-link{margin-top:20px;font-size:11px}.guide-top{padding:17px 18px}.guide-mark{font-size:28px}.guide-top strong{font-size:12px}.guide-top div>span{font-size:8px}.guide-conversation{min-height:259px;padding:21px 19px 5px}.guide-response p{font-size:12px}.student-question{font-size:11px}.prompt-options>button{font-size:10px;padding:11px 0}.prompt-label{font-size:9px;margin-top:10px}.mini-exercise{grid-template-columns:62px 1fr;font-size:10px}.faq-section{display:block}.faq-title h2{font-size:29px}.faq-list{margin-top:28px}.faq-item h3 button{font-size:12px;padding:21px 0}.faq-answer>p{font-size:11px;line-height:2}.final-cta{padding-top:68px;padding-bottom:76px}.final-cta .mono{font-size:8px;letter-spacing:1px}.final-cta h2{font-size:31px;margin-top:22px}.final-cta p{font-size:11px;max-width:285px;line-height:1.9}.final-cta .button{font-size:11px;gap:38px;min-height:48px;padding:13px 17px;margin-top:28px}.cta-orbit{width:80%;right:-43%;top:-40px;bottom:auto;height:380px;opacity:.6}.site-footer{padding-top:45px;padding-bottom:25px}.footer-top{flex-direction:column;gap:25px}.footer-top .brand{font-size:29px}.footer-top p{font-size:10px;margin-top:10px}.footer-links{gap:23px;font-size:10px;flex-wrap:wrap}.footer-links button{font-size:10px}.footer-large{font-size:12.5vw;letter-spacing:-.05em;line-height:1.4;margin:32px 0 23px}.footer-bottom{flex-direction:column;gap:17px;font-size:8px;padding-top:20px}.footer-bottom>div{gap:22px;font-size:8px}.footer-bottom button{font-size:8px}.modal-inner{padding:43px 24px 27px}.modal h2{font-size:27px}.modal-kicker{font-size:8px;letter-spacing:1px;max-width:250px;line-height:1.8}.modal-inner>p{font-size:11px}.modal legend{font-size:11px}.choice-grid button,.choice-list button{font-size:11px;min-height:45px}.modal-contact>div{gap:12px}.wechat-number{font-size:23px}.modal-contact .button{font-size:10px;padding:10px 12px;gap:10px}.modal-contact .button svg{width:15px;height:15px}.modal fieldset{margin:23px 0}.plan-result h3{font-size:17px}.plan-result p{font-size:12px}.modal .wide{font-size:12px;min-height:48px}.syllabus p{font-size:11px}}@media(max-width:360px){.nav-contact{font-size:9px;padding:8px}.nav-contact svg{display:none}.hero-title{font-size:48px}.hero-actions{gap:15px}.hero-actions .button{padding:11px 13px;font-size:10px;gap:12px}.film-link{gap:7px}.play-ring{width:31px;height:31px}.hero-art{height:397px}.scene-controls button{padding:8px 14px}.course-actions{gap:14px}.course-actions .text-link{font-size:9px}.course-info h3{font-size:24px}.guide-top{gap:10px}.modal-contact>div{align-items:flex-start;flex-direction:column}.footer-links{gap:18px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.course-geometry,.cta-orbit{animation:none}}.hero-scene canvas{width:100%;height:100%;outline-offset:-5px}.method-tab p,.founder-story>p,.future-copy p,.section-heading>p,.guide-response>p,.faq-answer>p{font-size:15px}.demo-hint,.course-note,.guide-top div>span{font-size:12px}.demo-head,.demo-range,.demo-result,.prompt-options>button,.student-question,.guide-top strong{font-size:13px}.prompt-options>button{min-height:44px}.course-meta span,.founder-credentials>span,.footer-links,.footer-links button{font-size:12px}.footer-bottom,.footer-bottom button{font-size:11px}.modal-inner>p,.modal legend,.choice-grid button,.choice-list button,.syllabus p,.plan-result p{font-size:14px}.modal-kicker,.modal .modal-footnote,.plan-result small,.copy-brief,.back-choice{font-size:12px}.modal-contact>p,.modal-contact .button,.copy-status{font-size:13px!important}.plan-result:focus{outline:none}.modal-contact .button{min-height:44px}.menu-toggle{min-width:40px;min-height:44px}@media(max-width:900px){.method-intro>p,.method-tab p,.section-heading>p,.course-info>p,.founder-story>p,.future-copy p,.guide-response>p,.faq-answer>p{font-size:14px}.faq-item h3 button{font-size:14px}.course-actions{flex-wrap:wrap}.course-actions .text-link{font-size:12px}.guide-top div>span{font-size:10px}}@media(max-width:650px){.hero-content{padding-top:125px}.nav-inner{gap:12px}.nav-contact{font-size:11px;min-height:40px}.scene-controls button{min-height:44px;font-size:12px}.method-intro>p,.method-tab p,.section-heading>p,.course-info>p,.founder-story>p,.future-copy p,.guide-response>p,.faq-answer>p,.final-cta p{font-size:14px}.method-tab p,.course-info>p,.founder-story>p,.faq-answer>p{line-height:1.95}.demo-head,.demo-result,.demo-range,.student-question,.prompt-options>button{font-size:12px}.demo-head{gap:8px}.demo-hint{font-size:12px;min-height:46px}.demo-range input{height:24px}.course-tabs{gap:16px}.course-tabs button{font-size:12px;gap:6px}.course-tabs button span{display:none}.course-meta span,.course-note,.founder-name p,.founder-credentials>span{font-size:11px}.course-meta strong{font-size:13px}.course-actions .button{font-size:12px}.course-actions .text-link{font-size:11px}.guide-top strong{font-size:13px}.guide-top div>span{font-size:10px}.prompt-label,.mini-exercise,.mini-exercise>p{font-size:12px}.mini-exercise input{font-size:16px;min-height:44px}.mini-exercise button{min-width:44px}.faq-item h3 button{font-size:14px}.final-cta .button{font-size:13px}.footer-top p,.footer-links,.footer-links button{font-size:12px}.footer-bottom,.footer-bottom button{font-size:11px}.footer-links{gap:20px}.footer-bottom>div{gap:20px}.footer-bottom button,.footer-bottom a{min-height:34px;display:inline-flex;align-items:center}.modal-inner{padding-left:22px;padding-right:22px}.modal-inner>p,.modal legend,.choice-grid button,.choice-list button,.syllabus p,.plan-result p{font-size:14px}.modal .modal-footnote,.modal-kicker,.plan-result small,.copy-brief,.back-choice{font-size:11px}.modal-contact>p,.modal-contact .button,.copy-status{font-size:12px!important}.wechat-number{font-size:23px}}@media(max-width:360px){.hero-actions{gap:15px}.nav-inner{padding:0 18px;gap:8px}.nav-contact{font-size:10px}.course-actions{gap:14px}.course-meta strong{font-size:12px}.course-actions .button{padding:11px 13px;gap:15px}.guide-top{padding:16px 14px}.guide-top strong{font-size:12px}.footer-links{gap:16px}}.tools-section{background:#e9eee2;border-top:1px solid #d5dcd0;border-bottom:1px solid #d5dcd0}.tools-section .section-heading>p{color:#596b5c}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:52px}.tool-card{display:flex;flex-direction:column;min-height:315px;padding:25px 25px 22px;background:#f8f8f1;border:1px solid #cbd5c5;border-radius:7px;color:var(--ink);transition:transform .3s,background .3s,border-color .3s,box-shadow .3s}.tool-card:hover{transform:translateY(-5px);background:#fffef8;border-color:#91a986;box-shadow:0 18px 35px -28px #304a3744}.tool-card-top{display:flex;align-items:center;justify-content:space-between;color:#71806c}.tool-card-top .mono{font-size:12px}.tool-arrow{display:grid;place-items:center;width:32px;height:32px;border:1px solid #b4c2ad;border-radius:50%;transition:background .25s,transform .25s}.tool-arrow svg{width:15px;height:15px}.tool-card:hover .tool-arrow{background:var(--coral);border-color:var(--coral);transform:translate(2px,-2px)}.tool-english{font-size:10px;color:#71806c;letter-spacing:1.5px;margin-top:38px}.tool-card h3{font-size:24px;letter-spacing:-.6px;margin-top:11px}.tool-card p{font-size:13px;line-height:1.95;color:#637060;margin-top:13px;max-width:310px}.tool-link{display:flex;align-items:center;gap:12px;margin-top:auto;padding-top:20px;color:#55724f;font-size:12px;border-top:1px solid #d6ded1}.tool-link svg{width:17px;height:17px;transition:transform .25s}.tool-card:hover .tool-link svg{transform:translate(3px,-2px)}.tools-note{font-size:11px;color:#70806d;margin-top:24px}@media(max-width:900px){.tool-grid{gap:12px}.tool-card{padding:21px 19px;min-height:300px}.tool-card h3{font-size:20px}.tool-card p{font-size:12px}}@media(max-width:650px){.tool-grid{grid-template-columns:1fr;gap:10px;margin-top:30px}.tool-card{min-height:0;padding:20px 19px}.tool-english{margin-top:24px}.tool-card h3{font-size:22px}.tool-card p{font-size:13px;max-width:none}.tool-link{margin-top:22px}.tools-note{font-size:10px;line-height:1.8}}
