*,*:before,*:after{box-sizing:border-box}*{margin:0}:root{--bg: #f6f8fb;--surface: #ffffff;--surface-2: #eff3f8;--text: #0f172a;--text-soft: #475569;--border: #e2e8f0;--brand: #1f6feb;--brand-dark: #1e40af;--accent-bg: #e0f2fe;--accent-border: #bae6fd;--ok: #16a34a;--radius: 12px;--maxw: 1080px;--shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 12px rgba(15, 23, 42, .05)}html{-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.65;font-size:17px;display:flex;flex-direction:column;min-height:100vh}main{flex:1 0 auto}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}a{color:var(--brand-dark)}h1,h2,h3{line-height:1.25;font-weight:700;color:var(--text)}h1{font-size:2rem}h2{font-size:1.4rem}h3{font-size:1.1rem}img,svg{display:block}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:1.2rem;color:var(--text);text-decoration:none}.logo svg{width:28px;height:28px}.site-header nav{display:flex;gap:20px}.site-header nav a{color:var(--text-soft);text-decoration:none;font-weight:600;font-size:.98rem}.site-header nav a:hover{color:var(--brand-dark)}.hero{background:linear-gradient(180deg,#fff 0%,var(--bg) 100%);border-bottom:1px solid var(--border);text-align:center;padding:54px 0 46px}.hero h1{font-size:2.4rem}.hero p{max-width:600px;margin:14px auto 0;color:var(--text-soft);font-size:1.08rem}.tool-section{margin:38px 0}.tool-section>h2{border-left:4px solid var(--brand);padding-left:12px;margin-bottom:16px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:18px}.tool-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:transform .12s ease,box-shadow .12s ease}.tool-card:hover{transform:translateY(-3px);box-shadow:0 6px 18px #0f172a1a}.tool-card h3{color:var(--brand-dark);margin-bottom:6px}.tool-card p{color:var(--text-soft);font-size:.96rem;flex:1}.tool-card-cta{margin-top:14px;font-weight:700;font-size:.92rem;color:var(--brand)}.tool-page{max-width:760px;margin:0 auto;padding:30px 0 50px}.crumbs{font-size:.88rem;color:var(--text-soft);margin-bottom:10px}.crumbs a{color:var(--text-soft)}.tool-page>h1{margin-bottom:8px}.lead{color:var(--text-soft);font-size:1.06rem;margin-bottom:22px}.tool{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.tool-fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column}.field.full{grid-column:1 / -1}.field label{font-weight:600;font-size:.9rem;margin-bottom:5px}.field .hint{font-weight:400;color:var(--text-soft)}input[type=number],select{width:100%;padding:11px 12px;font-size:16px;font-family:inherit;color:var(--text);background:#fff;border:1px solid var(--border);border-radius:8px}input[type=number]:focus,select:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}.input-unit{display:flex;align-items:stretch}.input-unit input{border-radius:8px 0 0 8px}.input-unit .unit{display:flex;align-items:center;padding:0 12px;background:var(--surface-2);border:1px solid var(--border);border-left:0;border-radius:0 8px 8px 0;color:var(--text-soft);font-size:.9rem;white-space:nowrap}.tool-result{margin-top:20px;background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:var(--radius);padding:20px}.result-label{font-size:.9rem;color:var(--text-soft);font-weight:600}.result-primary{font-size:2.2rem;font-weight:800;color:var(--brand-dark);line-height:1.15;margin:2px 0 4px}.result-rows{margin-top:12px;border-top:1px solid var(--accent-border);padding-top:12px}.result-row{display:flex;justify-content:space-between;gap:16px;padding:3px 0;font-size:.98rem}.result-row span:last-child{font-weight:700}.result-empty{color:var(--text-soft)}.tool-info{margin-top:36px}.tool-info h2{margin:26px 0 10px}.tool-info h3{margin:18px 0 6px}.tool-info p{margin-bottom:12px}.tool-info ul{margin:0 0 12px 22px}.tool-info li{margin-bottom:5px}.formula{background:var(--surface-2);border:1px solid var(--border);border-radius:8px;padding:12px 14px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.95rem;margin-bottom:14px}.note{background:#fff;border-left:4px solid var(--brand);padding:12px 14px;border-radius:0 8px 8px 0;color:var(--text-soft);font-size:.96rem}.related{margin-top:40px}.related h2{font-size:1.2rem;margin-bottom:14px}.home-about{max-width:760px}.home-about p{margin-bottom:12px;color:var(--text-soft)}.page{max-width:720px;margin:0 auto;padding:34px 0 50px}.page h1{margin-bottom:16px}.page h2{margin:24px 0 8px}.page p{margin-bottom:12px}.page ul{margin:0 0 12px 22px}.page li{margin-bottom:5px}.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:40px;padding:26px 0;flex-shrink:0}.site-footer nav{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:10px}.site-footer nav a{color:var(--text-soft);text-decoration:none;font-weight:600;font-size:.92rem}.site-footer nav a:hover{color:var(--brand-dark)}.site-footer p{color:var(--text-soft);font-size:.86rem}@media(max-width:560px){body{font-size:16px}.hero{padding:38px 0 34px}.hero h1{font-size:1.9rem}h1{font-size:1.7rem}.tool-fields{grid-template-columns:1fr}.tool{padding:16px}.result-primary{font-size:1.9rem}}