:root{--bg:#fdfaf7;--fg:#2b2b2b;--accent:#c9476b;--accent-soft:#f4d6df;--accent-hover:#b03a5c;--muted:#7a7a7a;--border:#e3ddd6;--code-bg:#f5f0ea;--done:#6b9e7e;--done-soft:#dcebe2}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Hiragino Kaku Gothic ProN,Yu Gothic UI,Meiryo,sans-serif;font-size:15px;line-height:1.7}main{max-width:880px;margin:0 auto;padding:32px 24px 80px}.page-header h1{font-size:26px;margin:0 0 4px}.page-header .lead{color:var(--muted);margin:0 0 24px;font-size:14px}.page-footer{margin-top:40px;text-align:center;color:var(--muted);font-size:12px}.stepper{justify-content:space-between;gap:8px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px 20px;margin-bottom:24px}.step,.stepper{display:flex;align-items:center}.step{gap:10px;flex:1 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