:root{--ink:#25231f;--paper:#fffdf8;--green:#3c7a45;--line:#e8e1d4;--soft:#f5f1e8}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;color:var(--ink);background:var(--paper);line-height:1.8}
a{color:inherit}.entrance{min-height:100svh;display:grid;place-items:center;background:#fff}.entrance a{display:block;width:100%;max-width:1600px}.entrance img{width:100%;height:auto;display:block}.enter-note{text-align:center;padding:14px;font-size:14px;letter-spacing:.08em}
.hero img{display:block;width:100%;height:auto}.wrap{width:min(920px,92%);margin:auto}.nav{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:22px 0 36px}.nav a{padding:12px 10px;text-align:center;text-decoration:none;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 3px 14px #0000000b}.intro{text-align:center;padding:30px 0 20px}.intro h1{font-size:clamp(25px,5vw,42px);margin:.2em 0}.intro p{max-width:680px;margin:0 auto;color:#555}.section{padding:38px 0;border-top:1px solid var(--line)}.section h2{font-size:24px;margin:0 0 12px}.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.card h3{margin-top:0}.button{display:inline-block;background:var(--green);color:#fff;text-decoration:none;padding:11px 18px;border-radius:999px;font-weight:700}.button.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.note{background:var(--soft);border-radius:16px;padding:18px}.footer{text-align:center;padding:48px 20px 60px;color:#666;font-size:13px}.small{font-size:13px;color:#666}.feedback-box{padding:22px;border:1px dashed #b9b09f;border-radius:18px;background:#fff}.feedback-box code{word-break:break-all}.badge{display:inline-block;font-size:12px;padding:3px 9px;border-radius:999px;background:#e7f2e7;color:#285d31;margin-bottom:8px}
@media(max-width:680px){.nav{grid-template-columns:repeat(2,1fr)}.cards{grid-template-columns:1fr}.section{padding:30px 0}.hero{overflow:hidden}.hero img{width:130%;max-width:none;margin-left:-15%}}