:root{--ink: #1c2733;--muted: #5b6b7b;--faint: #94a3b8;--accent: #0e7490;--accent-dark: #155e75;--bg: #ffffff;--panel: #f6f8fa;--line: #e2e8f0;--warn-bg: #fefce8;--warn-line: #eab308;--serif: Georgia, "Times New Roman", serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}main{max-width:920px;margin:0 auto;padding:0 24px 80px}h1{font-size:34px;line-height:1.2;letter-spacing:-.02em;margin:40px 0 12px}h2{font-size:21px;letter-spacing:-.01em;margin:40px 0 10px}h3{font-size:17px;margin:26px 0 8px}p{color:var(--muted);margin:10px 0}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.mono{font-variant-numeric:tabular-nums;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.93em}header.site{border-bottom:1px solid var(--line);margin-bottom:8px}header.site .inner{max-width:920px;margin:0 auto;padding:16px 24px;display:flex;align-items:baseline;gap:26px;flex-wrap:wrap}header.site .brand{font-weight:700;font-size:18px;color:var(--ink);letter-spacing:-.01em}header.site nav{display:flex;gap:18px;flex-wrap:wrap}header.site nav a{color:var(--muted);font-size:14.5px}header.site nav a:hover{color:var(--accent);text-decoration:none}.hero-sub{font-size:18.5px;max-width:700px}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:26px 0}.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:18px 20px}.card h3{margin-top:0}.card p{font-size:14.5px;margin-bottom:0}.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 20px;font-size:14.5px}.banner{background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:8px;padding:10px 14px;font-size:14px;margin:20px 0;color:var(--ink)}.btn{display:inline-block;background:var(--accent);color:#fff;border-radius:8px;padding:9px 16px;font-size:15px;font-weight:600}.btn:hover{background:var(--accent-dark);text-decoration:none}.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}pre.code{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:16px 20px;font-size:13.5px;line-height:1.55;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}pre.code .c{color:#64748b}table{border-collapse:collapse;width:100%;font-size:14.5px;margin:12px 0}th{text-align:left;color:var(--muted);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.04em}th,td{padding:7px 10px;border-bottom:1px solid var(--line)}td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}ul{color:var(--muted);padding-left:20px}li{margin:6px 0}form.calc{display:grid;gap:16px;max-width:560px}form.calc label{font-size:14px;font-weight:600;color:var(--ink);display:block;margin-bottom:4px}form.calc input,form.calc select{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:8px;font-size:15px;color:var(--ink);background:#fff}form.calc .hint{font-size:12.5px;color:var(--faint);margin-top:3px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px 16px}.grid2 .span2{grid-column:1 / -1}@media(max-width:640px){.grid2{grid-template-columns:1fr}}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}fieldset.fgroup{border:1px solid var(--line);border-radius:10px;padding:4px 18px 18px;margin:0;min-width:0}fieldset.fgroup legend{font-size:15px;font-weight:700;color:var(--ink);padding:0 8px;margin-left:-8px}fieldset.fgroup legend .step{color:var(--accent-dark);font-variant-numeric:tabular-nums;margin-right:7px}fieldset.fgroup .fhint{font-size:13px;color:var(--muted);margin:2px 0 12px}fieldset.fgroup.emph{border-left:4px solid var(--accent)}.result{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:8px;padding:16px 20px;margin-top:22px;background:var(--panel)}.result .big{font-size:30px;font-weight:700;letter-spacing:-.02em}.result .breakdown{font-size:14px;color:var(--muted);margin-top:6px}footer.site{border-top:1px solid var(--line);margin-top:70px}footer.site .inner{max-width:920px;margin:0 auto;padding:22px 24px 40px;font-size:13px;color:var(--faint)}footer.site .disclaimer{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 18px;font-size:13px;color:var(--muted);margin-bottom:14px}
