:root{--paper:#eef0ec;--ink:#000;--text:#2a2d29;--muted:#5c6159;--rule:#c9cec6;--sheet:#fff;--tag:#ffd23f;--laser:#ff2d20;--key:#f7f8f6;--key-edge:#aeb3aa;--display:"Big Shoulders Display", "Arial Narrow", sans-serif;--body:"Atkinson Hyperlegible Next", system-ui, sans-serif;--mono:"Martian Mono", ui-monospace, Menlo, monospace;--gutter:clamp(20px, 5vw, 64px);--measure:34rem;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root:lang(zh-TW){--display:"Big Shoulders Display", "Noto Sans TC", sans-serif;--body:"Atkinson Hyperlegible Next", "Noto Sans TC", system-ui, sans-serif}:root:lang(ja){--display:"Big Shoulders Display", "Noto Sans JP", sans-serif;--body:"Atkinson Hyperlegible Next", "Noto Sans JP", system-ui, sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--paper);color:var(--text);font:400 1.0625rem / 1.6 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var(--body);text-align:center;white-space:nowrap;border-bottom-width:3px;border-radius:6px;padding:3px 9px 4px;transition:transform 60ms,border-bottom-width 60ms,background 60ms;display:inline-block}.key-text{font-family:var(--mono);font-size:.8125rem;font-weight:400}.key.down{background:#e2e5df;border-bottom-width:1px;transform:translateY(2px)}.keystrip{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}.keystrip-label{color:var(--muted);margin-right:4px;font-size:.95rem}.keystrip .key-text{min-width:15ch}main>section:not(.hero){padding:clamp(56px, 8vw, 96px) var(--gutter);border-top:1px solid var(--rule)}.section-intro{max-width:var(--measure);margin-bottom:40px}.section-intro p{margin:20px 0 0}.note{max-width:var(--measure);color:var(--muted);margin:28px 0 0}.steps ol{counter-reset:step;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(24px,4vw,56px);margin:40px 0 0;padding:0;list-style:none;display:grid}.steps li{counter-increment:step}.steps 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