:root{color-scheme:light;--ink:#293e35;--green:#45664f;--muted:#58695e;--paper:#f8f9f5;--line:#dce3d7;--soft:#e9eedf;--yellow:#ffcd68}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.85;overflow-wrap:anywhere}
a{color:#315b3e;text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
a:focus-visible,summary:focus-visible{outline:3px solid #a57515;outline-offset:5px;border-radius:3px}
.skip{position:absolute;top:-100px;left:16px;background:#fff;padding:10px;z-index:2}.skip:focus{top:12px}
.wrap{width:min(100% - 40px,920px);margin-inline:auto}
.site-header{border-bottom:1px solid var(--line);background:#fff}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:18px}
.brand{font-size:19px;font-weight:800;text-decoration:none;letter-spacing:.04em}
.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;margin-right:9px;background:var(--soft);font-size:19px}
nav{display:flex;gap:8px 20px;flex-wrap:wrap;font-size:14px}
nav a{padding-block:5px}nav a[aria-current=page]{font-weight:700;text-decoration-thickness:2px}
main{padding-block:56px 72px}
.eyebrow{font-size:12px;letter-spacing:.12em;font-weight:800;color:var(--green);margin:0 0 12px}
h1{font-size:clamp(28px,5vw,46px);line-height:1.4;letter-spacing:.02em;margin:0 0 20px;text-wrap:balance}
h2{font-size:23px;line-height:1.5;margin:44px 0 14px}
h3{font-size:18px;line-height:1.6;margin:0 0 9px}
p{margin:0 0 18px}.lead{font-size:18px;color:var(--muted);max-width:660px}
.meta,.small{font-size:13px;color:var(--muted)}
.article{max-width:760px}.article ul,.article ol{padding-left:1.4em}.article li{margin-block:6px}
.hero{display:grid;grid-template-columns:1.25fr 1fr;gap:36px;align-items:center;padding-bottom:28px}
.hero h1{font-size:clamp(30px,4.3vw,44px)}
.keyboard{background:var(--soft);padding:26px 15px;border-radius:22px;border-bottom:5px solid #d6ddce;transform:rotate(-2deg)}
.key-row{display:flex;gap:4px;justify-content:center;margin:6px 0}.key-row:nth-child(2){padding-left:9px}.key-row:nth-child(3){padding-left:14px}
.key{display:grid;place-items:center;background:#fff;border:1px solid #d4dccf;border-bottom-width:3px;border-radius:6px;width:25px;aspect-ratio:1;font-size:12px;font-weight:700}.key.focus{background:var(--yellow);border-color:#bf913d}.key.home{text-decoration:underline;text-underline-offset:4px}
.keyboard-note{text-align:center;margin:14px 0 0;font-size:11px;color:var(--muted)}
.button{display:inline-block;background:var(--green);color:#fff;padding:11px 20px;border-radius:12px;font-weight:700;text-decoration:none;margin-top:8px}.button:hover{background:#36553f}
.facts{display:flex;flex-wrap:wrap;gap:7px 16px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px;font-weight:700;margin:20px 0 34px}
.course-list{list-style:none;counter-reset:courses;padding:0;margin:0}.course-list li{counter-increment:courses;position:relative;padding:22px 0 22px 62px;border-bottom:1px solid var(--line)}.course-list li:before{content:"0" counter(courses);position:absolute;left:0;top:25px;font-size:25px;line-height:1;font-weight:800;color:var(--green)}.course-list p{margin:0;color:var(--muted)}
.callout{background:var(--soft);padding:24px 28px;border-radius:16px;margin-block:28px}.callout h2{margin-top:0}.callout p:last-child{margin-bottom:0}
.contact{font-size:clamp(15px,2.7vw,20px);font-weight:700}
.qa{border-bottom:1px solid var(--line);padding:22px 0}.qa h2{margin:0 0 9px;font-size:19px}.qa p:last-child{margin-bottom:0}
.site-footer{border-top:1px solid var(--line);padding-block:28px 36px;font-size:12px;color:var(--muted)}.site-footer p{margin-bottom:9px}.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;margin-bottom:18px}
@media(max-width:700px){.wrap{width:min(100% - 32px,920px)}.header-inner{align-items:flex-start;flex-direction:column;gap:10px}nav{font-size:13px;gap:7px 18px}main{padding-block:36px 48px}.hero{grid-template-columns:1fr;gap:18px}.keyboard{max-width:360px;width:100%;margin:0 auto;transform:none}.hero h1{font-size:34px}.callout{padding:20px}.lead{font-size:16px}.course-list li{padding-left:50px}h2{font-size:21px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}