:root{--navy:#102b56;--navy2:#173b78;--blue:#2563eb;--blue2:#1d4ed8;--ink:#142033;--muted:#5e6b7d;--line:#dbe3ed;--bg:#f4f7fb;--panel:#fff;--soft:#eaf2ff;--green:#128a52;--orange:#d96b19;--shadow:0 16px 44px rgba(16,43,86,.11);--radius:22px;--calc-scale:1;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.62}a{color:var(--blue2);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}.shell{width:min(1180px,calc(100% - 32px));margin-inline:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:16px;top:16px;z-index:9999;background:#fff;border:2px solid var(--blue);padding:10px 14px;border-radius:10px}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{min-height:72px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);min-width:max-content}.brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(145deg,var(--navy2),var(--blue));color:#fff;font-weight:900;font-size:.78rem;letter-spacing:-.03em;box-shadow:0 9px 22px rgba(37,99,235,.25)}.brand strong{display:block;line-height:1.1;font-size:1.08rem}.brand small{display:block;color:var(--muted);font-size:.72rem}.nav-links{margin-left:auto;display:flex;align-items:center;gap:18px;font-size:.94rem;font-weight:750}.nav-links a{color:#26415f;padding:10px 0;border-bottom:2px solid transparent}.nav-links a.active{color:var(--blue2);border-color:var(--blue)}.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 12px;font-weight:800}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;background:var(--blue2);color:#fff;padding:12px 18px;font-weight:850;cursor:pointer;box-shadow:0 10px 22px rgba(37,99,235,.2)}.button:hover{background:#173fa6;text-decoration:none}.button.secondary{background:#fff;color:var(--blue2);border:1px solid var(--line);box-shadow:none}.button.secondary:hover{background:var(--soft)}.button.dark{background:var(--navy)}.button.compact{padding:9px 14px;font-size:.9rem}.button.wide{min-width:180px}.hero{padding:68px 0 42px}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:38px;align-items:center}.eyebrow{display:inline-flex;align-items:center;padding:7px 12px;border-radius:999px;background:var(--soft);color:var(--blue2);font-size:.86rem;font-weight:850}.hero h1,.page-hero h1{font-size:clamp(2.45rem,5.5vw,5.1rem);line-height:1.02;letter-spacing:-.055em;margin:17px 0}.lead{color:var(--muted);font-size:1.14rem;max-width:760px;margin:0 0 24px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero-panel{background:linear-gradient(145deg,var(--navy),#1f4d93);color:#fff;border-radius:30px;padding:30px;box-shadow:var(--shadow);position:relative;overflow:hidden}.hero-panel:after{content:"";position:absolute;width:270px;height:270px;border-radius:50%;background:rgba(255,255,255,.08);right:-90px;bottom:-120px}.hero-panel h2{margin-top:0;font-size:1.55rem}.hero-panel p{color:#d8e7ff}.hero-panel .mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;position:relative;z-index:1}.hero-panel .mini{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);border-radius:16px;padding:14px}.hero-panel .mini strong{display:block}.hero-panel .mini span{font-size:.86rem;color:#d8e7ff}.search-panel{margin-top:28px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;display:flex;gap:9px;box-shadow:0 12px 30px rgba(16,43,86,.08)}.search-panel input{flex:1;border:0;padding:9px 10px;min-width:0;outline:none}.search-panel button{border:0;border-radius:12px;background:var(--navy);color:#fff;padding:10px 16px;font-weight:800}.section{padding:36px 0}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.section-head h2{font-size:clamp(1.75rem,3vw,2.65rem);letter-spacing:-.04em;margin:0}.section-head p{max-width:620px;color:var(--muted);margin:0}.featured{display:grid;grid-template-columns:.95fr 1.05fr;gap:24px;background:#fff;border:1px solid var(--line);border-radius:28px;padding:28px;box-shadow:var(--shadow)}.featured-visual{min-height:330px;background:linear-gradient(145deg,#0d1728,#1b2d48);border-radius:22px;padding:24px;color:#fff;display:flex;align-items:center;justify-content:center}.calculator-mock{width:245px;background:#070a0f;border-radius:18px;padding:14px;box-shadow:0 22px 50px rgba(0,0,0,.34)}.calculator-mock .screen{height:126px;background:#f6fbff;border-radius:5px;margin-bottom:14px;padding:12px;color:#172033;font-family:ui-monospace,monospace}.calculator-mock .keys{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.calculator-mock .keys span{height:27px;background:#f8fafc;border-radius:6px}.calculator-mock .keys span:nth-child(3n){background:#2783dc}.calculator-mock .keys span:nth-child(7n){background:#48b94e}.featured-copy{padding:10px 6px}.featured-copy h2{font-size:clamp(2rem,3.7vw,3.4rem);line-height:1.05;letter-spacing:-.045em;margin:10px 0 14px}.featured-copy p{color:var(--muted)}.check-list{list-style:none;padding:0;margin:20px 0}.check-list li{position:relative;padding-left:28px;margin:9px 0;color:#42526a}.check-list li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:900}.grid-2,.grid-3,.grid-4{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card-link,.content-card{display:flex;flex-direction:column;gap:8px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:21px;color:var(--ink);min-height:175px}.card-link:hover{text-decoration:none;border-color:#92b7ee;box-shadow:0 12px 30px rgba(37,99,235,.09);transform:translateY(-1px)}.card-link strong{font-size:1.13rem;line-height:1.23}.card-link>span:last-child,.content-card p{color:var(--muted)}.card-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.card-eyebrow{text-transform:uppercase;letter-spacing:.07em;color:var(--blue2);font-weight:900;font-size:.75rem}.status-badge{font-size:.72rem;font-weight:850;border-radius:999px;background:#e8f7ef;color:#117443;padding:5px 9px}.subject-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;color:var(--ink);font-weight:850}.subject-card:hover{text-decoration:none;background:var(--soft)}.band{background:linear-gradient(135deg,var(--navy),var(--navy2));color:#fff;border-radius:28px;padding:30px;display:grid;grid-template-columns:1fr auto;gap:25px;align-items:center}.band p{color:#d8e7ff;margin-bottom:0}.page-hero{padding:50px 0 24px}.page-hero h1{font-size:clamp(2.15rem,4.7vw,4.4rem);max-width:930px}.breadcrumbs{font-size:.9rem;color:var(--muted);display:flex;gap:9px;flex-wrap:wrap;margin-bottom:15px}.breadcrumbs a{color:var(--muted)}.filter-row{display:flex;gap:10px;margin:20px 0}.filter-row input{width:100%;border:1px solid var(--line);border-radius:15px;background:#fff;padding:13px 15px}.category-title{margin:34px 0 14px;font-size:1.35rem}.tool-shell{background:#fff;border:1px solid var(--line);border-radius:24px;padding:25px;box-shadow:var(--shadow)}.tool-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}.calc-input,.tool-shell input,.tool-shell select,.tool-shell textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff}.tool-shell label{display:block;font-weight:800;margin:10px 0}.tool-shell label small{display:block;font-weight:500;color:var(--muted)}.calc-keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:15px 0}.calc-keypad button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:11px 5px;font-weight:800;cursor:pointer}.calc-keypad .op{background:var(--soft);color:var(--blue2)}.calc-keypad .danger{background:#fff0f0;color:#a51d1d}.calc-output{white-space:pre-wrap;background:#f7f9fc;border:1px solid var(--line);border-radius:15px;padding:16px;margin-top:15px;min-height:62px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.tool-controls{display:flex;gap:12px}.tool-controls label{flex:1}.canvas-wrap{background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;overflow:hidden}.graph-canvas{display:block;width:100%;height:430px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;background:#fff}th,td{border:1px solid var(--line);padding:11px;text-align:left;vertical-align:top}th{background:#f7f9fc}.profile-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:24px;align-items:start}.profile-main,.sidebar-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px}.sidebar-card{position:sticky;top:94px}.profile-main h2{margin-top:34px}.feature-pills{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.feature-pills span{background:var(--soft);color:var(--blue2);border-radius:999px;padding:7px 11px;font-weight:800;font-size:.86rem}.faq details{background:#fff;border:1px solid var(--line);border-radius:15px;padding:15px 17px;margin:10px 0}.faq summary{font-weight:850;cursor:pointer}.docs-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px;align-items:start}.docs-sidebar{position:sticky;top:92px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:17px;max-height:calc(100dvh - 120px);overflow:auto}.docs-sidebar h2{font-size:1rem;margin:0 0 9px}.docs-sidebar a{display:block;color:var(--muted);padding:7px 0;border-bottom:1px solid #edf1f6;font-size:.9rem}.doc-article{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:var(--shadow)}.doc-article h2{margin-top:32px;letter-spacing:-.025em}.doc-article p,.doc-article li{color:var(--muted)}.doc-intro{font-size:1.08rem}.doc-callout{background:#eef5ff;border:1px solid #c7daf8;color:#244a7f;border-radius:16px;padding:16px;margin:20px 0}.related-docs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.related-docs a{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:12px}.kbd{display:inline-flex;border:1px solid #bbc6d4;background:#f8fafc;border-radius:5px;padding:1px 6px;color:#1b2d48;font-weight:800;font-size:.88em}.doc-nav{display:flex;justify-content:space-between;gap:12px;margin-top:26px}.doc-nav a{background:#f8fafc;border:1px solid var(--line);border-radius:13px;padding:12px}.calculator-app-body{background:#f1f4f8;padding-top:var(--safe-top)}.app-only-header{min-height:62px;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:10px max(14px,env(safe-area-inset-right,14px)) 10px max(14px,env(safe-area-inset-left,14px));background:#fff;border-bottom:1px solid var(--line)}.app-only-header strong{font-size:1rem}.calculator-app-main{width:min(1180px,calc(100% - 24px));margin:12px auto 0}.calculator-section{background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}.calc-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:14px 17px;border-bottom:1px solid var(--line)}.calc-toolbar h1{font-size:1.2rem;letter-spacing:-.02em;margin:0}.zoom-controls{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.zoom-controls button{height:38px;min-width:40px;border:1px solid var(--line);border-radius:10px;background:#fff;font-weight:850;cursor:pointer}.zoom-label{min-width:56px;text-align:center;font-weight:850}.calculator-stage{min-height:calc(645px * var(--calc-scale));display:flex;justify-content:center;align-items:flex-start;padding:20px 10px 28px;overflow:auto}.calculator-shell{position:relative;display:inline-block;transform:scale(var(--calc-scale));transform-origin:top center;isolation:isolate}.calculator-shell.brand-light:before{content:"";position:absolute;top:5px;left:11px;width:104px;height:15px;background:#080808;border-radius:2px;z-index:2147483647;pointer-events:none}.calculator-shell.brand-minimized:after{content:"";position:absolute;top:5px;right:11px;width:100px;height:15px;background:#080808;border-radius:2px;z-index:2147483647;pointer-events:none}#calculatorDiv,.calculatorDiv{outline:none!important;margin-inline:auto}.runtime-status{margin:0;padding:12px 16px;background:#f7f9fc;border-top:1px solid var(--line);color:var(--muted);font-size:.88rem}.runtime-error{max-width:520px;background:#fff4e8;border:1px solid #f5c99c;color:#7d4010;border-radius:15px;padding:18px}.rotate-hint{display:none;text-align:center;background:#eef5ff;color:#244a7f;padding:8px;font-size:.86rem}.site-footer{margin-top:52px;padding:38px 0 22px;background:#fff;border-top:1px solid var(--line)}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:28px}.site-footer h2{font-size:.9rem;text-transform:uppercase;letter-spacing:.06em;margin:0 0 10px}.site-footer a{display:block;color:var(--muted);margin:7px 0}.footer-brand small{max-width:250px}.footer-bottom{border-top:1px solid var(--line);margin-top:28px;padding-top:17px;display:flex;justify-content:space-between;color:var(--muted);font-size:.86rem}.policy-box{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.source-link{display:flex;justify-content:space-between;gap:14px;border-bottom:1px solid var(--line);padding:12px 0}.source-link:last-child{border-bottom:0}.notice{background:#fff8e8;border:1px solid #f4dc9c;color:#75500d;border-radius:15px;padding:14px}.empty-state{display:none;background:#fff;border:1px dashed #aab6c5;border-radius:16px;padding:22px;text-align:center;color:var(--muted)}
@media(max-width:1000px){.hero-grid,.featured,.tool-grid,.profile-layout{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.sidebar-card{position:static}.docs-layout{grid-template-columns:1fr}.docs-sidebar{position:static;max-height:none}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.menu-toggle{display:block}.nav{flex-wrap:wrap;padding:10px 0}.nav-links{display:none;width:100%;order:4;margin:0;flex-direction:column;align-items:stretch;gap:0;padding:8px 0}.nav-links.open{display:flex}.nav-links a{padding:11px;border-bottom:1px solid var(--line)}.nav>.install-only{display:none}.hero{padding-top:42px}.hero-grid{gap:24px}.band{grid-template-columns:1fr}.calc-toolbar{align-items:flex-start;flex-direction:column}.zoom-controls{justify-content:flex-start}.calculator-app-main{width:100%;margin-top:0}.calculator-section{border-radius:0;border-left:0;border-right:0}.app-only-header{position:sticky;top:0;z-index:100}.rotate-hint{display:block}}
@media(max-width:640px){.shell{width:min(100% - 24px,1180px)}.hero h1,.page-hero h1{font-size:clamp(2.2rem,12vw,3.4rem)}.hero-panel{padding:22px}.hero-panel .mini-grid,.grid-2,.grid-3,.grid-4,.related-docs{grid-template-columns:1fr}.featured{padding:17px}.featured-visual{min-height:280px}.section{padding:28px 0}.search-panel{flex-direction:column}.search-panel button{width:100%}.tool-controls{flex-direction:column;gap:0}.calc-keypad{grid-template-columns:repeat(4,1fr)}.graph-canvas{height:330px}.doc-article{padding:21px}.doc-nav{flex-direction:column}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:6px}.calc-toolbar h1{font-size:1.05rem}.zoom-controls{width:100%}.calculator-stage{padding-inline:0}}
@media(orientation:landscape) and (max-height:520px){.calculator-stage{min-height:calc(595px * var(--calc-scale));padding-top:8px}.app-only-header{min-height:50px}.rotate-hint{display:none}}
.matrix-input{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:10px}.matrix-input input{text-align:center;font-weight:800}