:root{--dark-bg:#0a1a36;--dark-text:#fff;--light-bg:#fff;--light-text:#0a1a36;--accent:#3aa6ff;--deep-blue:#0f1d33;--card-dark:#102544;--muted:#607089;--font-family:Arial,"Helvetica Neue",Helvetica,sans-serif}
*{box-sizing:border-box}html,body{font-family:var(--font-family)}body{margin:0;background:var(--light-bg);color:var(--light-text);font-weight:600;line-height:1.55}body.dark{background:var(--dark-bg);color:var(--dark-text)}
.header{position:relative;display:flex;align-items:center;justify-content:space-between;padding:18px 50px;background:var(--light-bg);border-bottom:1px solid #ccc;font-weight:700;z-index:10}body.dark .header{background:#112347;border-color:#1f3a63}.brand{display:inline-flex;align-items:center;gap:12px;font-size:30px;font-weight:800;line-height:1;text-decoration:none;color:inherit}.brand:link,.brand:visited{color:inherit;text-decoration:none}.brand-logo{display:block;width:52px;height:52px;border-radius:50%;object-fit:cover}.nav-wrap{display:flex;align-items:center;gap:35px}.nav-links{display:flex;gap:35px;font-size:20px;font-weight:700}.nav-links a{color:inherit;text-decoration:none}.mode-btn{cursor:pointer;font-size:26px;padding:6px 12px;border-radius:8px;font-weight:800;color:inherit;background:transparent;border:0}.hamburger-btn{display:none;margin-right:-45px;transform:translateY(1px);width:44px;height:44px;background:transparent;border:0;border-radius:8px;cursor:pointer;color:inherit}.hamburger-icon{width:26px;height:26px}.hamburger-icon line{stroke:currentColor;stroke-width:2.5;stroke-linecap:round}.hamburger-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.mobile-menu{position:absolute;right:16px;top:100%;margin-top:10px;width:260px;overflow:hidden;max-height:0;opacity:0;pointer-events:none;transition:max-height .25s ease,opacity .2s ease;border-radius:12px;background:var(--light-bg);border:1px solid #e5e7eb;box-shadow:0 8px 24px rgba(0,0,0,.25);z-index:20}.mobile-menu.open{max-height:500px;opacity:1;pointer-events:auto}body.dark .mobile-menu{background:#102544;border-color:#1f3a63}.mobile-menu a{display:block;padding:12px 14px;text-decoration:none;color:inherit;border-bottom:1px solid #eee}body.dark .mobile-menu a{border-bottom-color:#1f3a63}.mobile-menu a:last-child{border-bottom:none}
.hero{padding:84px 20px 56px;background:linear-gradient(180deg,rgba(58,166,255,.10),rgba(58,166,255,0))}.hero-inner{max-width:1040px;margin:0 auto;text-align:center}.eyebrow{display:inline-flex;align-items:center;padding:7px 12px;border:1px solid rgba(58,166,255,.35);border-radius:999px;color:#1677c8;background:rgba(58,166,255,.08);font-size:13px;font-weight:900;letter-spacing:.08em;text-transform:uppercase}body.dark .eyebrow{color:#83c8ff}.hero h1{font-size:clamp(38px,6vw,64px);line-height:1.04;margin:20px auto 18px;font-weight:900;letter-spacing:-.035em;max-width:980px}.hero p{font-size:20px;max-width:800px;margin:0 auto;color:var(--muted);font-weight:600}body.dark .hero p{color:#d8e2f1}.cta{display:inline-flex;align-items:center;justify-content:center;gap:8px;margin-top:30px;padding:15px 24px;border-radius:10px;background:var(--accent);color:#fff;text-decoration:none;font-weight:900;font-size:18px;box-shadow:0 10px 25px rgba(58,166,255,.22);transition:transform .15s ease,filter .15s ease}.cta:hover{transform:translateY(-2px);filter:brightness(1.04)}.trust-link{display:block;margin-top:15px;color:inherit;opacity:.72;text-decoration:none;font-size:14px}.trust-link:hover{opacity:1}
.container{max-width:1180px;margin:0 auto;padding:0 20px}.output-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:0 auto 48px}.output-card{padding:22px;border:1px solid #dbe5f1;border-radius:14px;background:#fff;box-shadow:0 6px 22px rgba(15,29,51,.06);text-align:center;font-weight:900}body.dark .output-card{background:#102544;border-color:#1f3a63}.content-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,.7fr);gap:28px;align-items:start}.section{background:#fff;border:1px solid #dbe5f1;border-radius:16px;padding:32px;margin-bottom:28px;box-shadow:0 6px 22px rgba(15,29,51,.05)}body.dark .section{background:#102544;border-color:#1f3a63}.section h2{font-size:28px;margin:0 0 14px;font-weight:900;letter-spacing:-.02em}.section h3{font-size:20px;margin:22px 0 8px;font-weight:900}.section p{margin:0 0 14px;font-size:17px;color:#3e4c60}body.dark .section p{color:#d8e2f1}.clean-list{margin:18px 0 0;padding:0;list-style:none}.clean-list li{position:relative;padding:12px 0 12px 28px;border-top:1px solid #edf1f6}.clean-list li:first-child{border-top:0}.clean-list li:before{content:'✓';position:absolute;left:0;color:var(--accent);font-weight:900}.step-list{counter-reset:step;list-style:none;padding:0;margin:16px 0 0}.step-list li{counter-increment:step;display:grid;grid-template-columns:34px 1fr;gap:12px;padding:14px 0;border-top:1px solid #edf1f6}.step-list li:first-child{border-top:0}.step-list li:before{content:counter(step);display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:9px;background:rgba(58,166,255,.12);color:#1677c8;font-weight:900}body.dark .step-list li:before{color:#83c8ff}.factor{padding:18px 0;border-top:1px solid #edf1f6}.factor:first-of-type{border-top:0}.factor strong{display:block;font-size:17px;margin-bottom:5px}.factor p{font-size:15px;margin:0}.note{background:rgba(58,166,255,.08);border:1px solid rgba(58,166,255,.25);border-radius:12px;padding:18px;font-size:15px;line-height:1.5}.faq details{border-top:1px solid #e7edf5;padding:16px 0}.faq details:first-of-type{border-top:0}.faq summary{cursor:pointer;font-weight:900;font-size:17px}.faq details p{margin:10px 0 0}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.related a{display:block;padding:18px;border:1px solid #dbe5f1;border-radius:12px;color:inherit;text-decoration:none;background:#fff;font-weight:900}.related a:hover{border-color:var(--accent);transform:translateY(-1px)}body.dark .related a{background:#0f1d33;border-color:#1f3a63}.aside-card{position:sticky;top:24px}.aside-card .cta{width:100%;margin-top:12px}.aside-card h2{font-size:22px}.mini-link{display:block;padding:12px 0;border-top:1px solid #e7edf5;color:inherit;text-decoration:none;font-weight:800}.mini-link:first-of-type{margin-top:10px}.mini-link:hover{color:#1677c8}body.dark .mini-link:hover{color:#83c8ff}footer{text-align:center;padding:40px 10px;opacity:.9;font-size:18px;font-weight:700;margin-top:60px}footer a{text-decoration:none;color:inherit}
.method-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#f4f7fb;border:1px solid #dbe5f1;border-radius:10px;padding:14px;overflow:auto;font-weight:700}body.dark .formula{background:#0f1d33;border-color:#1f3a63}.source-list a{color:#1677c8}body.dark .source-list a{color:#83c8ff}
@media(max-width:900px){.header{padding:16px}.brand-logo{width:40px;height:40px}.nav-links{display:none}.hamburger-btn{display:inline-flex;align-items:center;justify-content:center}.hero{padding-top:58px}.content-grid{grid-template-columns:1fr}.aside-card{position:static}.output-grid,.related,.method-grid{grid-template-columns:1fr}.hero p{font-size:18px}}
@media(max-width:520px){.brand{font-size:23px;gap:9px}.hero h1{font-size:38px}.hero{padding:46px 16px 36px}.section{padding:24px 20px}.output-card{padding:18px}.container{padding:0 14px}}