:root{--ink:#10231d;--muted:#62706b;--paper:#f7f4ed;--card:#fff;--lime:#c9f45b;--green:#1e513e;--line:#d8ddd7;--red:#a73a35;--shadow:0 18px 50px rgba(16,35,29,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.7}.site-header{height:72px;padding:0 max(24px,calc((100% - 1160px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(16,35,29,.12)}a{color:inherit}.brand{text-decoration:none;font-weight:800;letter-spacing:-.02em}.brand span{display:inline-grid;place-items:center;background:var(--ink);color:var(--lime);border-radius:50%;width:34px;height:34px;margin-right:8px}.site-header nav,.site-header nav a{display:flex;gap:24px;text-decoration:none;font-size:.88rem}.hero{max-width:1160px;margin:auto;padding:88px 24px 54px}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-weight:800;font-size:.75rem;color:var(--green)}h1{font-size:clamp(3rem,8vw,6.4rem);line-height:.95;letter-spacing:-.07em;margin:.25em 0}h1 em{font-style:normal;color:var(--green)}.hero>p:not(.eyebrow){font-size:1.12rem;max-width:650px}.trust{display:flex;flex-wrap:wrap;gap:12px 26px;padding:0;list-style:none;font-size:.85rem;font-weight:700}.trust li:before{content:"✓";margin-right:7px;color:var(--green)}.calculator{max-width:1160px;margin:auto;padding:0 24px}.panel{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:clamp(22px,4vw,42px);margin-bottom:22px;box-shadow:var(--shadow)}.section-heading{display:flex;gap:18px;align-items:flex-start;margin-bottom:28px}.section-heading>span{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--ink);color:var(--lime);font:700 .82rem monospace}.section-heading h2{margin:-7px 0 0;font-size:clamp(1.55rem,3vw,2.2rem);letter-spacing:-.04em}.section-heading p{margin:0;color:var(--muted)}.field-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.field-grid label,.platform-select{font-size:.82rem;font-weight:700}.input-wrap{display:flex;align-items:center;background:#f2f3ef;border:1px solid transparent;border-radius:12px;padding:0 14px;margin-top:6px;font-size:1.05rem}.input-wrap:focus-within{border-color:var(--green);box-shadow:0 0 0 3px rgba(30,81,62,.12)}input,select{font:inherit;color:inherit;background:transparent;border:0;min-width:0;width:100%;padding:12px 8px;outline:0}.field-grid small{display:block;color:var(--muted);font-weight:400}.accent-field{grid-column:span 2}.accent-field .input-wrap{background:#eef7d7;border-color:#d3e9a0}button{margin-top:28px;border:0;border-radius:999px;background:var(--ink);color:white;padding:15px 22px;font-weight:800;font-size:1rem;cursor:pointer}button span{color:var(--lime);margin-left:14px}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;min-width:850px;text-align:right}th,td{padding:16px 12px;border-bottom:1px solid var(--line)}thead th{color:var(--muted);font-size:.73rem}th:first-child{text-align:left}tbody th{font-size:.9rem}tbody th small{display:block;color:var(--muted);font-weight:400;max-width:250px}.selected{background:#f3f8e8}.positive{color:var(--green);font-weight:800}.negative{color:var(--red);font-weight:800}.caption{font-size:.78rem;color:var(--muted)}.platform-select{display:block;max-width:430px}.platform-select select{display:block;border:1px solid var(--line);border-radius:12px;margin-top:6px;padding:13px;background:white}fieldset{display:flex;gap:15px;border:1px solid var(--line);border-radius:14px;margin:18px 0;padding:16px}fieldset label{font-size:.76rem}fieldset input{border-bottom:1px solid var(--line)}.ad-detail{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:24px}.ad-detail>div{background:var(--ink);color:white;border-radius:17px;padding:24px}.ad-detail span{display:block;color:#bdd0c8;font-size:.8rem}.ad-detail strong{display:block;color:var(--lime);font-size:clamp(2rem,5vw,3.6rem);line-height:1.1}.ad-detail p{grid-column:1/-1;color:var(--muted);margin:0}.content-section{max-width:1160px;margin:90px auto;padding:0 24px}.content-section h2{font-size:clamp(2rem,5vw,3.6rem);letter-spacing:-.05em;margin:.1em 0 .7em}.formula-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.formula-grid article{background:white;border:1px solid var(--line);border-radius:16px;padding:22px}.formula-grid h3{margin:0}.formula-grid p{margin-bottom:0}.notice{border-left:4px solid var(--lime);background:#edf2e6;padding:18px;margin-top:20px}.example p:not(.eyebrow){font-size:1.2rem;max-width:850px}.sources ul{padding-left:1.2em}.sources li{margin:12px 0}.history dl div{display:grid;grid-template-columns:180px 1fr;border-top:1px solid var(--line);padding:16px 0}.history dt{font-weight:800}.history dd{margin:0}footer{background:var(--ink);color:white;padding:54px max(24px,calc((100% - 1160px)/2));display:grid;grid-template-columns:1fr auto;gap:25px}footer p,footer small{color:#aebfb8}footer nav{display:flex;gap:18px;flex-wrap:wrap}footer small{grid-column:1/-1}@media(max-width:720px){.site-header nav a:first-child{display:none}.hero{padding-top:58px}.field-grid{grid-template-columns:1fr 1fr}.accent-field{grid-column:1/-1}.ad-detail,.formula-grid{grid-template-columns:1fr}.ad-detail p{grid-column:auto}fieldset{display:grid}.history dl div{grid-template-columns:1fr}footer{grid-template-columns:1fr}}@media(max-width:480px){.field-grid{grid-template-columns:1fr}.accent-field{grid-column:auto}.panel{border-radius:18px;padding:20px}.site-header{height:64px}.brand{font-size:.82rem}}
