:root{--navy:#0b1e50;--blue:#1848b4;--cyan:#24a8e4;--paper:#f5f8fc;--line:#d9e2f0;--muted:#53627e;--white:#fff;--violet:#a06ed2;font-family:'Yu Gothic UI','Yu Gothic','Hiragino Kaku Gothic ProN',Meiryo,sans-serif;color:var(--navy);background:var(--white);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-size:16px;line-height:1.9}a{color:var(--blue);text-underline-offset:5px}button{font:inherit}a,button,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:6px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.45;letter-spacing:.025em}h2{font-size:30px;font-weight:700}h3{font-size:20px}p{color:var(--muted)}.skip{position:absolute;left:12px;top:-80px;background:white;padding:12px;z-index:10}.skip:focus{top:8px}.preview-banner{background:#fff2cf;color:#614600;text-align:center;font-size:12px;line-height:1.6;padding:7px 16px}.preview-banner span{margin-left:18px}.site-header{max-width:1240px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:27px 40px;gap:20px}.wordmark{display:inline-flex;gap:12px;align-items:center;font-size:26px;font-weight:750;text-decoration:none;color:var(--navy);white-space:nowrap;letter-spacing:.04em}.brand-mark{font-family:Georgia,serif;display:grid;place-items:center;background:var(--blue);color:white;border-radius:12px 12px 3px 12px;width:40px;height:40px;font-style:italic;font-size:28px}.site-header nav{display:flex;gap:32px;align-items:center}.site-header nav a{font-size:14px;text-decoration:none;color:var(--navy)}.site-header nav a:last-child{background:var(--blue);color:white;border-radius:5px;padding:9px 20px}.site-header nav a[aria-current]{text-decoration:underline;text-decoration-thickness:2px}.menu-toggle{display:none}.hero{max-width:1240px;padding:56px 40px 84px;margin:auto;display:grid;grid-template-columns:1.05fr 1fr;gap:72px;align-items:center}.hero-intro{color:var(--blue);font-size:14px;font-weight:700;margin-bottom:22px}.hero h1{font-size:clamp(54px,5.6vw,78px);line-height:1.32;letter-spacing:.035em;margin-bottom:24px;font-weight:750}.hero-description{font-size:17px;line-height:2.05}.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--blue);background:var(--blue);color:white;text-decoration:none;border-radius:5px;font-weight:650;font-size:14px;padding:14px 27px;min-height:50px;line-height:1.6}.button:hover{background:#123a91}.button.secondary{background:white;color:var(--blue)}.button.secondary:hover{background:var(--paper)}.learning-board{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:18px 18px 64px 18px;padding:26px 30px;box-shadow:16px 18px 0 #eaf0fa}.board-top{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.board-dot{height:9px;width:9px;background:var(--cyan);border-radius:50%;margin-top:7px}.board-main{padding:27px 0 20px}.board-main h2{font-size:30px;margin:24px 0}.play-art{height:135px;position:relative}.art-window{width:215px;height:132px;border:2px solid var(--blue);border-radius:8px;background:white;padding:10px;transform:rotate(-5deg);margin-left:40px}.art-window i{display:inline-block;width:5px;height:5px;border-radius:50%;background:#cbd6ec;margin:0 2px}.art-lines{display:grid;gap:10px;margin:12px 18px}.art-lines b{height:8px;background:#d9e6fa;border-radius:2px}.art-lines b:first-child{width:70%;background:var(--blue)}.art-lines b:last-child{width:80%}.art-play{position:absolute;left:235px;top:61px;background:var(--blue);border:6px solid var(--paper);color:white;width:70px;height:70px;border-radius:50%;display:grid;place-items:center;padding-left:3px;font-size:22px}.board-path{display:flex;align-items:center;gap:8px;font-size:12px}.board-path span{padding:7px 10px;background:white;border:1px solid var(--line);border-radius:5px}.board-path span+span:before{content:''}.board-bottom{border-top:1px solid var(--line);padding-top:17px;display:flex;gap:10px;justify-content:space-between;font-size:11px}.board-bottom small{font-size:10px;color:var(--muted)}.intro-band{background:var(--paper);padding:50px max(40px,calc((100vw - 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@media(max-width:360px){.hero h1{font-size:50px}.board-path{font-size:10px;gap:4px}.board-path span{padding:5px}.art-window{margin-left:0;width:190px}.art-play{left:165px}.board-bottom{flex-direction:column}.hero .button{padding:12px 14px}.steps{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

@media(max-width:720px){.course-grid article{display:block}.course-grid p{margin-top:10px}}