:root{--paper:#f8f6ef;--ink:#253c33;--muted:#5b6860;--line:#d9ded3;--green:#254a3d;--accent:#b45f31;--serif:"Hiragino Mincho ProN","Yu Mincho",serif;--sans:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.85}a{color:inherit;text-decoration:none}button{font:inherit}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}::selection{background:#efd7b5}.section-shell{width:min(1160px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;left:12px;top:12px;padding:8px 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@media(max-width:1000px){.section-shell{width:calc(100% - 64px)}.site-header{width:calc(100% - 64px)}.hero{gap:24px}.hero-copy .eyebrow{font-size:10px}.hero-description{font-size:13px}h1{font-size:46px}.formula{font-size:25px}.art-sticker{font-size:15px;padding:15px;right:-8px}.subject-strip{flex-wrap:wrap;gap:12px}.lesson-section,.price-section,.faq-section{gap:35px;grid-template-columns:1fr 1.5fr}.section-intro h2{font-size:30px}.contact-panel{padding:38px 32px}.contact-panel h2{font-size:30px}.contact-action .button{gap:16px}.site-footer{flex-wrap:wrap}.site-footer p{margin-left:auto}.back-top{margin-left:auto}}
@media(max-width:700px){.demo-banner{padding:8px 18px;justify-content:flex-start;font-size:9px;gap:9px;align-items:flex-start}.demo-tag{margin-top:1px}.section-shell,.site-header{width:calc(100% - 40px)}.site-header{min-height:87px}.brand{font-size:16px;gap:9px;letter-spacing:.025em}.brand-symbol{height:34px;width:34px;font-size:23px}.brand small{font-size:8px;letter-spacing:.13em}.site-header nav{gap:12px;font-size:10px}.site-header nav a:first-child{display:none}.nav-contact{padding:7px 10px}.nav-contact span{margin-left:7px}.hero{grid-template-columns:1fr;gap:30px;padding:24px 0 40px}.hero-copy .eyebrow{font-size:10px;margin-bottom:17px}h1{font-size:clamp(39px,10.8vw,55px);line-height:1.55;margin-bottom:18px}.hero-description{font-size:13px;margin-bottom:24px}.button{padding:13px 22px;font-size:12px;gap:32px}.hero-caption{margin-top:25px;font-size:9px}.hero-art{width:min(410px,100%);margin:0 auto;padding:9px 16px 17px 1px}.notebook{box-shadow:8px 10px 0 #e6e8dc;transform:rotate(1.6deg)}.notebook-top{margin-top:15px;padding-bottom:12px}.paper-grid{margin-top:12px}.formula{font-size:25px}.graph{max-height:270px}.equation-note{font-size:24px;padding-bottom:18px}.notebook-bottom{padding-block:8px;font-size:9px}.art-sticker{bottom:62px;right:2px;font-size:15px;padding:14px 18px}.art-coordinate{margin-top:19px;font-size:10px}.subject-strip{padding:20px 0;gap:12px}.subject-strip p{font-size:16px}.subject-strip>div{gap:8px 18px;flex-wrap:wrap;font-size:10px}.lesson-section,.price-section,.faq-section{grid-template-columns:1fr;gap:26px;padding:62px 0}.section-intro .eyebrow,.faq-section .eyebrow{margin-bottom:13px}.section-intro h2{font-size:29px;margin-bottom:15px}.section-intro>p:last-child{margin-bottom:0;font-size:12px}.lesson-list article{padding:24px 0;gap:16px}.lesson-list h3{font-size:14px}.lesson-list p{font-size:12px}.item-number{font-size:18px}.item-symbol{font-size:22px}.process-wrap{padding:44px 0}.process-heading{display:block}.process-heading h2{font-size:28px}.process-heading>p{margin-top:13px}.process-heading>p br{display:none}.process-list{grid-template-columns:1fr;gap:24px;margin-top:28px}.process-list li{padding-top:18px}.process-list h3{margin:8px 0;font-size:16px}.price-section{padding-bottom:48px}.price-row{padding:23px 0;gap:14px}.price-row h3{font-size:23px}.price-row p{font-size:10px;max-width:180px}.price-value strong{font-size:34px}.faq-section{padding:16px 0 50px;gap:12px}.faq-section h2{font-size:26px;margin-bottom:9px}.faq-list summary{font-size:12px;padding:20px 0}.contact-panel{display:block;padding:31px 26px}.contact-panel h2{font-size:28px}.contact-panel p{font-size:11px}.contact-action{margin-top:25px;text-align:left}.contact-action .button{width:100%;font-size:12px}.contact-action p{font-size:9px;text-align:center}.site-footer{padding:31px 0 27px;gap:20px}.site-footer p{width:100%;margin:0;order:3;font-size:9px}.site-footer .brand{font-size:14px}.back-top{font-size:9px}.dialog-body{padding:26px}.dialog-body h2{font-size:21px}.dialog-body p{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}