:root{color-scheme:light;--ink:#183b46;--muted:#50656b;--line:#c4d4d9;--paper:#f1f6f8;--blue:#135a76;--alert:#7d4310}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.55 'Segoe UI',system-ui,sans-serif}header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px max(6vw,24px);border-bottom:1px solid var(--line);background:white;color:var(--muted)}.brand{font-size:24px;font-weight:700;color:var(--ink);letter-spacing:.03em}main{max-width:760px;margin:48px auto;padding:0 24px}h1{font-size:clamp(30px,5vw,42px);font-weight:650;line-height:1.15;letter-spacing:-.025em;margin:24px 0 8px}h2{font-size:21px;margin:28px 0 12px}#context{color:var(--muted);font-size:20px;margin-top:0}.notice{border-left:4px solid var(--blue);background:#e0edf3;padding:12px 16px}.notice.simulation{border-color:var(--alert);color:#663506;background:#fff0d9}dl{display:grid;grid-template-columns:135px 1fr;gap:12px 22px;margin:28px 0}dt{color:var(--muted)}dd{margin:0;font-weight:600;overflow-wrap:anywhere}.step{background:white;border:1px solid var(--line);border-radius:8px;padding:18px 22px;margin:12px 0}.step h3{margin:0 0 12px;font-size:19px}.step dl{font-size:15px;margin:0;grid-template-columns:minmax(120px,1fr) 1.5fr}ul{padding-left:22px;color:var(--muted)}li+li{margin-top:12px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}button{border:1px solid var(--blue);border-radius:6px;background:var(--blue);color:white;padding:13px 20px;font:600 16px 'Segoe UI',sans-serif;cursor:pointer}button.secondary{background:transparent;color:var(--blue)}button:disabled{opacity:.55;cursor:default}button:focus-visible,input:focus-visible{outline:3px solid #e09125;outline-offset:4px}.hint{font-size:14px;color:var(--muted)}#status{font-weight:600;overflow-wrap:anywhere}label{display:block;margin-top:24px}input{display:block;width:100%;padding:12px;border:1px solid var(--line);border-radius:4px;margin:8px 0 20px;font:inherit}footer{max-width:760px;margin:40px auto;padding:20px 24px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}[hidden]{display:none!important}@media(max-width:520px){header{font-size:13px;padding:16px}main{margin-top:24px;padding:0 18px}dl{grid-template-columns:1fr;gap:3px}dd{margin-bottom:12px}.step{padding:16px}.step dl{grid-template-columns:1fr}button{width:100%}}