:root{--bg:#fff;--fg:#1b1f24;--muted:#5b6573;--line:#e6e9ee;--soft:#f5f7fa;--brand:#0f766e;--brand-soft:#e6f4f2;--accent:#f59e0b;--radius:10px;--max:760px;--wide:1080px}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--fg);word-break:keep-all;overflow-wrap:anywhere;margin:0;font-family:Pretendard,Apple SD Gothic Neo,Malgun Gothic,system-ui,sans-serif;font-size:17px;line-height:1.75}a{color:var(--brand)}img{max-width:100%;height:auto}.container{max-width:var(--wide);margin:0 auto;padding:0 20px}.narrow{max-width:var(--max);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--line);z-index:10;background:#fff;position:sticky;top:0}.site-header .container{justify-content:space-between;align-items:center;gap:16px;height:60px;display:flex}.logo{color:var(--fg);letter-spacing:-.5px;font-size:19px;font-weight:800;text-decoration:none}.logo span{color:var(--brand)}.nav{gap:18px;font-size:15px;display:flex}.nav a{color:var(--fg);text-decoration:none}.nav a:hover{color:var(--brand)}.site-footer{border-top:1px solid var(--line);color:var(--muted);margin-top:72px;padding:32px 0 48px;font-size:14px}.site-footer nav{flex-wrap:wrap;gap:16px;margin-bottom:10px;display:flex}.site-footer a{color:var(--muted)}.hero{padding:48px 0 24px}.hero h1{letter-spacing:-1px;margin:0 0 12px;font-size:34px;line-height:1.3}.hero p{color:var(--muted);margin:0;font-size:18px}.section-title{letter-spacing:-.5px;margin:40px 0 16px;font-size:22px}.grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.card{border:1px solid var(--line);border-radius:var(--radius);color:var(--fg);background:#fff;padding:18px 20px;text-decoration:none;transition:border-color .15s;display:block}.card:hover{border-color:var(--brand)}.card h3{margin:6px 0;font-size:18px;line-height:1.45}.card p{color:var(--muted);margin:0;font-size:15px;line-height:1.6}.badge{color:var(--brand);background:var(--brand-soft);border-radius:999px;padding:2px 10px;font-size:12px;font-weight:700;display:inline-block}.card.tool{background:var(--soft)}.breadcrumb{color:var(--muted);margin:28px 0 8px;font-size:14px}.breadcrumb a{color:var(--muted);text-decoration:none}article h1{letter-spacing:-.8px;margin:8px 0 12px;font-size:30px;line-height:1.35}.meta{color:var(--muted);margin-bottom:28px;font-size:14px}.prose h2{letter-spacing:-.5px;margin:44px 0 14px;padding-top:4px;font-size:23px}.prose h3{margin:28px 0 10px;font-size:19px}.prose p,.prose ul,.prose ol{margin:0 0 18px}.prose li{margin:4px 0}.prose table{border-collapse:collapse;width:100%;margin:8px 0 24px;font-size:15px;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:9px 12px}.prose th{background:var(--soft);white-space:nowrap}.prose blockquote{background:var(--brand-soft);border-left:4px solid var(--brand);border-radius:6px;margin:0 0 18px;padding:12px 18px}.prose blockquote p{margin:0}.prose code{background:var(--soft);border-radius:4px;padding:1px 6px;font-size:.92em}.toolbox{border:1px solid var(--brand);background:var(--brand-soft);border-radius:var(--radius);margin:28px 0;padding:16px 20px}.toolbox strong{margin-bottom:4px;display:block}.disclosure{color:var(--muted);background:var(--soft);border-radius:6px;margin-bottom:20px;padding:10px 14px;font-size:14px}.related{margin-top:48px}.ad-slot{min-height:0;margin:32px 0}.calc{border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin:20px 0 28px;padding:22px}.calc .row{grid-template-columns:1fr;gap:6px;margin-bottom:16px;display:grid}.calc label{font-size:15px;font-weight:700}.calc input,.calc select{font:inherit;background:#fff;border:1px solid #cfd5dd;border-radius:8px;width:100%;padding:10px 12px}.calc .seg{flex-wrap:wrap;gap:8px;display:flex}.calc .seg label{cursor:pointer;border:1px solid #cfd5dd;border-radius:8px;align-items:center;gap:6px;padding:8px 12px;font-weight:500;display:flex}.calc .seg input{width:auto}.calc .hint{color:var(--muted);font-size:13px}.result{background:var(--soft);border-radius:var(--radius);padding:18px 20px}.result .big{color:var(--brand);letter-spacing:-.5px;font-size:28px;font-weight:800}.result table{border-collapse:collapse;width:100%;margin-top:10px;font-size:15px}.result td{border-bottom:1px solid var(--line);padding:6px 0}.result td:last-child{text-align:right;font-weight:700}.note{color:var(--muted);font-size:14px}@media (width<=640px){body{font-size:16px}.hero h1{font-size:27px}article h1{font-size:25px}.nav{gap:12px;font-size:14px}}