:root{color-scheme:light;--ink:#203b34;--green:#215a47;--line:#d8e2dd}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f7f8f4;color:var(--ink);font:16px/1.85 system-ui,-apple-system,'Noto Sans JP',sans-serif}header,main,footer{max-width:1160px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}a{color:var(--green);text-underline-offset:4px}.brand{font-size:22px;font-weight:800;text-decoration:none}.breadcrumb,.small{font-size:14px;color:#55635d}.hero{padding:48px 0 32px;border-bottom:1px solid var(--line)}.eyebrow{font-size:14px;font-weight:700;color:var(--green);letter-spacing:.05em}h1{font-size:clamp(28px,4vw,44px);line-height:1.5;max-width:880px;margin:12px 0 20px}h2{font-size:26px;line-height:1.5;margin:0 0 20px}h3{font-size:18px;line-height:1.6;margin:4px 0 12px}.lead{font-size:18px;max-width:820px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:20px;background:var(--green);color:white;padding:13px 20px;border-radius:6px;text-decoration:none;font-weight:700}.button:hover{background:#173e31}a:focus-visible,summary:focus-visible{outline:3px solid #be8a27;outline-offset:4px}section{margin:36px 0 56px;scroll-margin-top:24px}.designs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.design{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}.poster{padding:18px;background:#edf1ec}.poster img{display:block;width:100%;height:350px;object-fit:contain}.design-copy{padding:20px;display:flex;flex-direction:column;flex:1}.design-copy .button{margin-top:auto;font-size:15px}.number{font-size:13px;color:#65796e}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:40px}li{margin:12px 0}blockquote{margin:16px 0;padding:16px 20px;background:#fff;border-left:4px solid #c5a34b}.steps{background:#e9f0e9;padding:28px;border-radius:10px}.steps ol{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;padding-left:24px}.related{display:flex;gap:12px;flex-wrap:wrap}.related a{padding:10px 16px;background:white;border:1px solid var(--line);border-radius:6px}details{border-bottom:1px solid var(--line);padding:16px 0}summary{cursor:pointer;font-weight:700}footer{border-top:1px solid var(--line);font-size:14px;padding-bottom:40px}@media(max-width:760px){header,main,footer{padding:20px}.hero{padding-top:20px}.designs,.two-col,.steps ol{grid-template-columns:1fr}.poster img{height:340px}.steps ol{gap:8px}.two-col{gap:20px}h2{font-size:23px}header>a:last-child{font-size:13px}.brand{font-size:18px}}