:root{--navy:#001538;--navy2:#02244f;--blue:#125ddc;--blue2:#0f4fbe;--ink:#061b3e;--muted:#596579;--line:#dfe7f3;--soft:#f4f7fc;--soft2:#eaf1fd;--white:#fff;--shadow:0 18px 45px rgba(4,29,70,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.65;background:#fff}a{color:inherit;text-decoration:none}.topbar{background:var(--navy);color:#fff;position:sticky;top:0;z-index:20;box-shadow:0 2px 14px rgba(0,0,0,.12)}.nav{max-width:1180px;margin:auto;padding:14px 24px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.01em}.brand-mark{width:34px;height:34px;border:2px solid #2f7bf6;border-radius:50%;display:grid;place-items:center;color:#2f7bf6}.brand-mark:after{content:"";width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 -9px 0 #2f7bf6,9px 0 0 #2f7bf6,0 9px 0 #2f7bf6,-9px 0 0 #2f7bf6}.navlinks{margin-left:auto;display:flex;align-items:center;gap:22px;font-weight:650;font-size:14px}.navlinks a{color:#dce5f7}.navlinks a:hover{color:#fff}.launch{background:var(--blue);color:#fff!important;border-radius:8px;padding:10px 17px;display:inline-flex;align-items:center;gap:7px}.launch:hover{background:var(--blue2)}
.hero{background:linear-gradient(180deg,#f7faff 0%,#eaf1fd 100%);border-bottom:1px solid #dce6f7}.hero-inner{max-width:1180px;margin:auto;padding:58px 24px 50px;display:grid;grid-template-columns:1.45fr .8fr;gap:48px;align-items:center}.breadcrumb{font-size:13px;color:#64738d;margin-bottom:14px}.breadcrumb a{color:var(--blue);font-weight:700}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:800;color:var(--blue);margin-bottom:10px}.title-row{display:flex;align-items:center;gap:16px}.module-icon{width:58px;height:58px;border-radius:16px;background:#fff;display:grid;place-items:center;color:var(--blue);box-shadow:0 10px 25px rgba(18,93,220,.13);flex:none}.module-icon svg{width:29px;height:29px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.hero h1{font-size:48px;line-height:1.06;margin:0;letter-spacing:-1.3px}.hero-summary{font-size:18px;color:#46566f;max-width:760px;margin:18px 0 24px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:12px 21px;font-weight:750;font-size:14px}.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 22px rgba(18,93,220,.25)}.btn-primary:hover{background:var(--blue2)}.btn-secondary{background:#fff;color:var(--blue);border:1px solid #cddcf5}.formula-card{background:var(--navy2);color:#fff;border-radius:18px;padding:28px;box-shadow:var(--shadow);position:relative;overflow:hidden}.formula-card:after{content:"";position:absolute;width:180px;height:180px;border:34px solid rgba(84,142,240,.12);border-radius:50%;right:-90px;top:-95px}.formula-card .small{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:#a9c3ee;font-weight:800}.formula{font-family:Georgia,"Times New Roman",serif;font-size:27px;line-height:1.35;margin:12px 0 20px}.formula-note{font-size:13px;color:#c8d6ed;border-top:1px solid rgba(255,255,255,.12);padding-top:15px}
.content{max-width:1180px;margin:auto;padding:44px 24px 70px}.overview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:36px}.overview-card{border:1px solid var(--line);border-radius:14px;padding:20px;background:#fff}.overview-card .label{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:#6a7890;font-weight:800}.overview-card p{margin:7px 0 0;font-size:14px;color:#3f4e65}.layout{display:grid;grid-template-columns:255px minmax(0,1fr);gap:34px}.toc{position:sticky;top:88px;align-self:start;border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff;max-height:calc(100vh - 110px);overflow:auto}.toc h2{font-size:13px;text-transform:uppercase;letter-spacing:.09em;margin:0 0 12px;color:#5d6b82}.toc a{display:block;font-size:13px;color:#526078;padding:7px 9px;border-left:2px solid transparent}.toc a:hover{background:var(--soft);color:var(--blue);border-left-color:var(--blue)}.source-files{margin-top:18px;padding-top:15px;border-top:1px solid var(--line)}.source-files span{display:block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;color:#53647e;background:var(--soft);padding:5px 7px;border-radius:5px;margin-top:6px;overflow-wrap:anywhere}.guide{min-width:0}.section-card{border:1px solid var(--line);border-radius:16px;background:#fff;margin-bottom:18px;overflow:hidden;scroll-margin-top:96px}.section-card details{margin:0}.section-card summary{cursor:pointer;list-style:none;padding:21px 24px;font-size:19px;font-weight:800;display:flex;align-items:center;justify-content:space-between;gap:16px;background:linear-gradient(90deg,#fff,#f9fbff)}.section-card summary::-webkit-details-marker{display:none}.section-card summary:after{content:"+";font-size:24px;font-weight:400;color:var(--blue)}.section-card details[open] summary:after{content:"−"}.section-body{border-top:1px solid var(--line);padding:23px 24px 26px;color:#35445c}.section-body p{margin:0 0 15px}.section-body ol,.section-body ul{padding-left:24px}.guide-label{font-weight:800;color:var(--ink);margin-top:18px!important}.formula-block,.example-block{white-space:pre-wrap;overflow:auto;border-radius:10px;padding:16px 18px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.6}.formula-block{background:#f3f6fb;border-left:4px solid #9db8e8;color:#263a5a}.example-block{background:#eef5ff;border-left:4px solid var(--blue);color:#1e375f}.page-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:32px}.page-nav a{border:1px solid var(--line);border-radius:12px;padding:16px 18px}.page-nav a:last-child{text-align:right}.page-nav small{display:block;text-transform:uppercase;letter-spacing:.08em;color:#728099;font-size:10px;font-weight:800}.page-nav strong{color:var(--blue)}.footer{background:var(--navy);color:#b8c7e0;padding:28px 24px;text-align:center;font-size:13px}.footer a{color:#fff;font-weight:700}
@media(max-width:900px){.navlinks a:not(.launch){display:none}.hero-inner{grid-template-columns:1fr}.hero h1{font-size:38px}.overview-grid{grid-template-columns:1fr}.layout{grid-template-columns:1fr}.toc{position:relative;top:0;max-height:none}.page-nav{grid-template-columns:1fr}.page-nav a:last-child{text-align:left}}@media(max-width:560px){.nav{padding:12px 16px}.brand span{display:none}.hero-inner{padding:38px 18px}.title-row{align-items:flex-start}.module-icon{width:50px;height:50px}.hero h1{font-size:33px}.content{padding:30px 16px 55px}.section-card summary,.section-body{padding-left:18px;padding-right:18px}}