*{box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth}body{margin:0;line-height:1.7}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:.2em}.wrap{width:min(1120px,calc(100% - 36px));margin:auto}.site-head{position:sticky;top:0;z-index:5}.head-inner{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:2rem}.brand-group{display:flex;align-items:baseline;gap:1rem}.site-nav{display:flex;gap:1.2rem;font-size:.82rem}.home-hero p{color:var(--muted);margin:1.5rem 0 0}.section-title{font-size:.85rem;letter-spacing:.09em;margin:3rem 0 1rem;color:var(--muted)}.tool-card h2{font-size:1.15rem;margin:0 0 .35rem}.tool-card p{font-size:.9rem;color:var(--muted);margin:0}.page-main{padding:4rem 0 6rem}.page-main h1{font-size:clamp(2rem,5vw,3.8rem);line-height:1.1;letter-spacing:-.035em;margin:.5rem 0 1rem}.lead{font-size:1.04rem;max-width:46rem;color:var(--muted);margin-bottom:2.5rem}.calc-box{max-width:760px}.input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.1rem 1.4rem}.field label{display:block;font-size:.82rem;font-weight:700;margin-bottom:.35rem}.input-wrap{display:flex;align-items:center;border:1px solid var(--line);background:#fff}.input-wrap:focus-within{outline:2px solid var(--accent);outline-offset:1px}.input-wrap input{width:100%;min-width:0;border:0;background:transparent;padding:.72rem .8rem;font:inherit;color:var(--ink);outline:none}.unit{padding-right:.75rem;color:var(--muted);font-size:.8rem;white-space:nowrap}.actions{margin-top:1.5rem}.primary{font:inherit;font-weight:700;padding:.75rem 1.25rem;cursor:pointer}.result-box{display:none;margin-top:1.6rem;border-top:1px solid var(--line);padding-top:1.2rem}.result-box.visible{display:block}.result-row{display:flex;justify-content:space-between;gap:1rem;padding:.55rem 0;border-bottom:1px dotted var(--line)}.result-row span{color:var(--muted);font-size:.9rem}.result-row strong{text-align:right}.error{color:#8f2d25;font-size:.9rem;margin-top:1rem}.notes{max-width:760px;margin-top:3rem;display:grid;grid-template-columns:1fr 1fr;gap:2.5rem}.notes h2{font-size:1rem;margin:0 0 .55rem}.notes p{color:var(--muted);font-size:.91rem;margin:0}.site-foot{border-top:1px solid var(--line);padding:2rem 0 4rem;color:var(--muted);font-size:.8rem}.foot-inner{display:flex;justify-content:space-between;gap:2rem}.about{max-width:760px}.about h2{margin-top:2.5rem}.about p,.about li{color:var(--muted)}.ad-slot{margin:2.8rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:1rem 0;font-size:.72rem;color:var(--muted);text-align:center;letter-spacing:.08em}.ad-slot:before{content:'ADVERTISEMENT';opacity:.65}.affiliate-note{font-size:.75rem;color:var(--muted);margin-top:2rem}.smallprint{font-size:.76rem;color:var(--muted)}
@media(max-width:760px){.head-inner{min-height:58px}.tagline,.site-nav{display:none}.home-hero{padding-top:3.8rem!important}.tool-list{display:block!important;background:transparent!important;border:0!important}.tool-card{display:block!important;padding:1.25rem 0!important;border-left:0!important;min-height:0!important}.tool-card a{display:block!important}.tool-card .tool-no{display:block;margin:0 0 .3rem}.input-grid{grid-template-columns:1fr}.notes{grid-template-columns:1fr;gap:1.5rem}.foot-inner{display:block}.page-main{padding-top:3rem}}

body{--ink:#17202a;--muted:#65717c;--paper:#f5f3ed;--line:#c9c6bd;--accent:#9b3327;--panel:#fffdf8;font-family:Arial,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;background:var(--paper);color:var(--ink)}.site-head{border-bottom:3px solid var(--ink)}.brand{font-weight:800;letter-spacing:.04em}.tagline{font-size:.9rem;color:var(--muted)}.home-hero{border-bottom:1px solid var(--line);padding:5.5rem 0 3.5rem}.home-hero h1{font-size:clamp(2.4rem,8vw,5.8rem);line-height:.95;letter-spacing:-.06em;max-width:11ch}.tool-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;border-top:1px solid var(--line)}.tool-card{padding:1.5rem 0;border-bottom:1px solid var(--line)}.tool-card a{display:grid;grid-template-columns:4rem 1fr;gap:1rem}.tool-card:nth-child(odd){padding-right:2rem}.tool-card:nth-child(even){padding-left:2rem;border-left:1px solid var(--line)}.tool-no{font-family:ui-monospace,monospace;color:var(--accent)}.calc-box{border:2px solid var(--ink);background:var(--panel);box-shadow:8px 8px 0 var(--line)}.result-row strong{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.primary{background:var(--ink);color:#fff;border:0;border-radius:0}.eyebrow{color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.12em}
.hero-line{display:block}.home-hero h1{max-width:none}