:root{--hot:#b51e23;--hot2:#8f1015;--cold:#0b69b7;--cold2:#084b86;--ink:#24303a;--muted:#5c6974;--pale:#f4f8fb;--bluepale:#edf6fd;--redpale:#fff1f1;--border:#d8e2ea;--white:#fff;--shadow:0 12px 34px rgba(20,55,85,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.7}a{color:var(--cold2);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.wrap{width:min(1160px,92vw);margin:auto}.topbar{background:#eef4f8;border-bottom:1px solid var(--border);font-size:.88rem;color:var(--muted)}.topbar .wrap{padding:7px 0}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;gap:18px;min-height:82px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.36rem;letter-spacing:-.045em;color:var(--ink);white-space:nowrap}.brand:hover{text-decoration:none}.brand-mark{width:35px;height:35px;border-radius:50% 50% 48% 48%;position:relative;background:linear-gradient(90deg,var(--cold) 0 49%,var(--hot) 51% 100%);box-shadow:inset 0 0 0 4px #fff,0 0 0 1px var(--border)}.brand-hot{color:var(--hot)}.brand-cold{color:var(--cold)}nav{margin-left:auto}.nav{display:flex;gap:2px;list-style:none;margin:0;padding:0}.nav a{display:block;padding:9px 7px;border-radius:9px;font-weight:750;color:var(--ink);font-size:.82rem}.nav a:hover{background:var(--pale);text-decoration:none}.hero{background:linear-gradient(135deg,#eef7fd 0%,#fff 48%,#fff2f2 100%);border-bottom:1px solid var(--border);padding:64px 0}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}.hero-img,.hub-img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:18px;box-shadow:var(--shadow);border:1px solid var(--border)}.eyebrow{font-size:.78rem;text-transform:uppercase;letter-spacing:.11em;font-weight:850;color:var(--cold)}h1,h2,h3{line-height:1.18;letter-spacing:-.025em}h1{font-size:clamp(2.2rem,4.7vw,4.4rem);margin:.25em 0 .35em}h2{font-size:clamp(1.65rem,3vw,2.55rem);margin:.3em 0 .55em}h3{font-size:1.18rem}.lead{font-size:1.14rem;color:#44525d;max-width:840px}.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 17px;border-radius:10px;background:var(--hot);color:#fff;font-weight:800;border:1px solid var(--hot);text-decoration:none}.btn:hover{background:var(--hot2);text-decoration:none}.btn.secondary{background:#fff;color:var(--cold2);border-color:#9fc9e8}.btn.secondary:hover{background:var(--bluepale)}.section{padding:58px 0}.section.alt{background:var(--pale);border-top:1px solid #edf2f5;border-bottom:1px solid #edf2f5}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.grid.two{grid-template-columns:repeat(2,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}.card{background:#fff;border:1px solid var(--border);border-radius:15px;padding:22px;box-shadow:0 6px 20px rgba(30,60,80,.035)}.card h3{margin-top:0}.card p:last-child{margin-bottom:0}.page-head{background:linear-gradient(135deg,#eef7fd,#fff 55%,#fff3f3);border-bottom:1px solid var(--border);padding:45px 0}.breadcrumbs{font-size:.86rem;color:var(--muted);margin-bottom:9px}.breadcrumbs a{color:var(--muted)}.article{max-width:850px}.article h2{margin-top:1.65em}.article h3{margin-top:1.45em}.article ul,.article ol{padding-left:1.35rem}.notice{border-left:4px solid var(--cold);background:var(--bluepale);padding:16px 18px;border-radius:8px;margin:24px 0}.notice.hot{border-left-color:var(--hot);background:var(--redpale)}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f7f9fb;border:1px solid var(--border);padding:14px 16px;border-radius:10px;overflow:auto}.related{margin-top:40px;border-top:1px solid var(--border);padding-top:24px}.related-links{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}.related-links a{padding:10px 12px;border:1px solid var(--border);border-radius:9px;background:#fff}.cta{margin-top:42px;background:linear-gradient(125deg,var(--cold2),#075a9e 48%,var(--hot2));color:#fff;padding:30px;border-radius:18px;box-shadow:var(--shadow)}.cta h3{font-size:1.55rem;margin:.15em 0 .4em}.cta p{max-width:800px}.cta-brand{background:#fff;display:inline-flex;padding:7px 10px;border-radius:8px}.cta-brand img{width:140px;display:block}.cta-actions{display:flex;flex-wrap:wrap;gap:9px}.btn-light{background:#fff;color:var(--cold2);border-color:#fff}.btn-light:hover{background:#f5f8fa}.footer{background:#07131d;color:#d8e2e8;margin-top:0}.footer-main{display:grid;grid-template-columns:1.35fr .7fr 1fr;gap:42px;padding:46px 0 32px}.footer a{color:#fff}.footer-brand .brand{color:#fff;margin-bottom:14px}.footer-info,.footer-smartfire{display:flex;flex-direction:column;gap:8px}.footer-info strong,.footer-smartfire strong{color:#fff}.footer-bottom{border-top:1px solid #26333d;padding:17px 0 23px;font-size:.86rem;color:#aebcc6}.tool{max-width:820px;border:1px solid var(--border);border-radius:16px;padding:24px;background:#fff}.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.field label{display:block;font-weight:750;font-size:.91rem;margin-bottom:5px}.field input,.field select{width:100%;padding:11px 12px;border:1px solid #bfcbd4;border-radius:9px;background:#fff;font:inherit}.tool-result{margin-top:18px;padding:18px;border-radius:12px;background:var(--bluepale);border:1px solid #bddbf0}.tool-result:empty{display:none}.small{font-size:.88rem;color:var(--muted)}.table-wrap{overflow:auto}.data-table{border-collapse:collapse;width:100%;margin:18px 0}.data-table th,.data-table td{border:1px solid var(--border);padding:10px;text-align:left}.data-table th{background:var(--pale)}.tempbar{height:12px;border-radius:8px;background:linear-gradient(90deg,var(--cold),#7fbfe7,#ddd,#ed9999,var(--hot));margin:12px 0}.mobile-menu-toggle{display:none;margin-left:auto;border:1px solid var(--border);background:#fff;border-radius:9px;width:44px;height:42px;align-items:center;justify-content:center;cursor:pointer}.mobile-menu-toggle span,.mobile-menu-toggle span:before,.mobile-menu-toggle span:after{content:"";display:block;width:21px;height:2px;background:var(--ink);position:relative;transition:.2s}.mobile-menu-toggle span:before{position:absolute;top:-7px}.mobile-menu-toggle span:after{position:absolute;top:7px}.mobile-open .mobile-menu-toggle span{background:transparent}.mobile-open .mobile-menu-toggle span:before{top:0;transform:rotate(45deg)}.mobile-open .mobile-menu-toggle span:after{top:0;transform:rotate(-45deg)}
@media(max-width:980px){.header-inner{min-height:70px;position:relative}.brand{font-size:1.05rem}.brand-mark{width:30px;height:30px}.mobile-menu-toggle{display:flex}.header-inner>nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border:1px solid var(--border);border-radius:0 0 13px 13px;box-shadow:0 18px 35px rgba(20,40,60,.12);padding:10px 14px 16px}.header-inner.mobile-open>nav{display:block}.nav{display:flex;flex-direction:column}.nav a{font-size:.98rem;padding:11px}.hero-grid{grid-template-columns:1fr;gap:28px}.grid,.grid.four{grid-template-columns:repeat(2,1fr)}.footer-main{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:640px){.wrap{width:min(92vw,100%)}.topbar{font-size:.78rem}.hero{padding:40px 0}.page-head{padding:32px 0}.section{padding:40px 0}.grid,.grid.two,.grid.four,.related-links,.tool-grid{grid-template-columns:1fr}.footer-main{grid-template-columns:1fr;gap:28px}.footer-brand{grid-column:auto}.btns,.cta-actions{flex-direction:column;align-items:stretch}.btn{width:100%}.brand-text{white-space:normal}.hero-img,.hub-img{border-radius:13px}}

.method{margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}.method h2{margin-top:0}.method .formula{margin-top:12px}

.article .data-table td strong{color:var(--ink)} .article .notice a{font-weight:800}