:root{--ink:#17211f;--navy:#23436f;--green:#55745e;--muted:#56615d;--paper:#faf9f6;--line:#d6e2d8;--mint:#edf4ef;--radius:22px;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-size:16px;line-height:1.6}*{box-sizing:border-box}body{margin:0}a{color:var(--navy);text-underline-offset:.2em}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #be6422;outline-offset:4px}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}h1,h2,h3{line-height:1.2;text-wrap:balance}h1{font-size:clamp(2.4rem,5.5vw,4.5rem);letter-spacing:-.045em;max-width:15ch;margin:0 0 28px}html[lang=ja] h1{max-width:13em;letter-spacing:-.04em}h2{font-size:clamp(1.7rem,3vw,2.5rem);margin:0 0 24px;letter-spacing:-.025em}h3{font-size:1.22rem}p{margin:0 0 20px;overflow-wrap:anywhere}nav{display:flex;gap:24px;flex-wrap:wrap}.site-header,footer{max-width:1200px;margin:auto;padding:28px 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20px}.hero-aside{padding:24px}section{padding:42px 20px}.features{grid-template-columns:1fr;gap:14px}.tinted{margin:0 20px;padding:26px 22px}.screen-section{margin:0 20px;gap:24px;flex-direction:column}.screen-section img{width:270px}.help-main{padding:22px 16px}.field-row{grid-template-columns:1fr}.guide{padding:22px 18px}.help-main h1{font-size:1.9rem}.button{width:100%}h1{font-size:2.6rem}.lead{font-size:1.1rem}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}