:root{
  --ink:#15181D;--ink-2:#262A30;--paper:#F7F2E8;--surface:#FFFCF6;--white:#FFFFFF;
  --orange:#F28A2B;--orange-dark:#CF6812;--muted:#686A6F;--line:#D9D2C8;--soft:#ECE5DB;
  --success:#1F7A4D;--danger:#A73B36;--shadow:0 18px 48px rgba(21,24,29,.10);
  --radius:18px;--max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}img{max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.announcement{background:var(--ink);color:#fff;font-size:14px}.announcement .container{min-height:38px;display:flex;align-items:center;justify-content:center;gap:12px}.announcement a{color:#FFD2A7;font-weight:700}
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,242,232,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;min-width:max-content}.brand img{width:42px;height:42px;border-radius:10px}.brand-copy{display:flex;flex-direction:column;line-height:1.05}.brand-name{font-weight:900;letter-spacing:.08em;font-size:15px}.brand-sub{font-size:12px;color:var(--muted);margin-top:4px}.nav-links{display:flex;align-items:center;gap:24px;font-weight:700;font-size:14px}.nav-links a:hover{color:var(--orange-dark)}.nav-cta{padding:10px 15px;background:var(--ink);color:#fff!important;border-radius:10px}.menu-button{display:none;border:1px solid var(--line);background:var(--surface);border-radius:10px;width:42px;height:42px;align-items:center;justify-content:center}.menu-button span,.menu-button span:before,.menu-button span:after{display:block;width:18px;height:2px;background:var(--ink);position:relative}.menu-button span:before,.menu-button span:after{content:"";position:absolute;left:0}.menu-button span:before{top:-6px}.menu-button span:after{top:6px}
.hero{padding:78px 0 64px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(420px,.92fr);align-items:center;gap:64px}.eyebrow{display:inline-block;color:var(--orange-dark);font-weight:800;font-size:13px;letter-spacing:.08em;text-transform:uppercase}.hero h1,.page-hero h1{font-size:clamp(42px,6vw,76px);line-height:.98;letter-spacing:-.045em;margin:16px 0 24px;max-width:850px}.accent{color:var(--orange-dark)}.hero-lead,.page-lead{font-size:19px;line-height:1.7;color:#4F5156;max-width:720px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 12px}.store-badge{border:0;background:none;padding:0;display:inline-flex}.store-badge img{display:block;height:54px;width:auto}.plain-btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 20px;border-radius:11px;border:1px solid var(--ink);font-weight:800;background:var(--surface)}.plain-btn.primary{background:var(--ink);color:#fff}.plain-btn.orange{background:var(--orange);border-color:var(--orange);color:#19130D}.plain-btn:hover{transform:translateY(-1px)}.hero-note{font-size:13px;color:var(--muted)}.proof-row{display:flex;flex-wrap:wrap;gap:20px;margin-top:30px;color:#4D4F54;font-size:14px}.proof-row span{padding-left:16px;position:relative}.proof-row span:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange);position:absolute;left:0;top:.62em}
.hero-calculator{background:var(--ink);border:1px solid #34383E;border-radius:26px;padding:20px;box-shadow:var(--shadow);position:relative}.hero-calc-head{display:flex;align-items:center;justify-content:space-between;color:#BFC2C7;font-size:12px;margin-bottom:10px}.hero-display{background:#0C0E11;border:1px solid #30343A;border-radius:15px;padding:18px 18px 16px;min-height:112px;color:#fff;text-align:right}.hero-display small{display:block;color:#8D9197;min-height:22px}.hero-display strong{display:block;font-size:31px;margin-top:12px;letter-spacing:-.02em}.mini-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}.mini-key{border:1px solid #363A41;background:#24282E;color:#F2F2F2;border-radius:10px;min-height:45px;font-weight:700}.mini-key.fn{color:#FFB36C}.mini-key.eq{background:var(--orange);border-color:var(--orange);color:#1A1410}.mini-key:hover{border-color:#676C74}
.section{padding:74px 0}.section.white{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section.dark{background:var(--ink);color:#fff}.section-head{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:34px}.section-head h2{font-size:clamp(30px,4vw,48px);letter-spacing:-.035em;line-height:1.05;margin:8px 0}.section-head p{max-width:590px;color:var(--muted);margin:0}.dark .section-head p{color:#B9BDC3}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.feature-card img{width:46px;height:46px;margin-bottom:18px}.feature-card h3{margin:0 0 8px;font-size:19px}.feature-card p{margin:0;color:var(--muted)}.feature-card a{display:inline-block;margin-top:18px;font-weight:800;color:var(--orange-dark)}
.tool-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--surface)}.tool-strip a{padding:25px;border-right:1px solid var(--line)}.tool-strip a:last-child{border-right:0}.tool-strip strong{display:block;font-size:16px;margin-bottom:5px}.tool-strip span{font-size:13px;color:var(--muted)}
.screenshot-row{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;overflow:auto;padding-bottom:12px}.screenshot-row figure{margin:0;min-width:180px;background:#0D1014;border:1px solid #32363C;border-radius:18px;padding:10px}.screenshot-row figcaption{color:#B8BCC2;font-size:12px;padding:10px 4px 2px}.screenshot-row img{border-radius:11px;display:block;width:100%}
.page-hero{padding:54px 0 38px}.breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:16px}.breadcrumb a{font-weight:700}.workspace-wrap{padding:26px 0 76px}.workspace{display:grid;grid-template-columns:230px minmax(0,1fr);gap:20px;align-items:start}.tool-nav{position:sticky;top:98px;border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:10px}.tool-nav a,.tool-nav button{width:100%;display:flex;align-items:center;gap:11px;border:0;background:transparent;text-align:left;padding:11px 12px;border-radius:9px;color:#4E5055;font-weight:700;font-size:14px}.tool-nav a:hover,.tool-nav a.active,.tool-nav button:hover{background:var(--soft);color:var(--ink)}.tool-nav img{width:24px;height:24px}.workspace-main{min-width:0}.panel{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px}.panel + .panel{margin-top:18px}.panel-head{display:flex;justify-content:space-between;align-items:start;gap:20px;margin-bottom:18px}.panel-head h2,.panel-head h3{margin:0;letter-spacing:-.02em}.panel-head p{margin:5px 0 0;color:var(--muted);font-size:14px}.segmented{display:inline-flex;border:1px solid var(--line);border-radius:10px;padding:3px;background:#F3EDE4}.segmented button{border:0;background:transparent;border-radius:7px;padding:7px 11px;font-size:12px;font-weight:800}.segmented button.active{background:var(--ink);color:#fff}
.calculator-shell{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:16px}.calculator-card{background:var(--ink);border:1px solid #30343A;border-radius:20px;padding:16px}.calc-toolbar{display:flex;align-items:center;justify-content:space-between;color:#D5D7DA;font-size:13px;margin-bottom:10px;gap:12px}.calc-toolbar-group{display:flex;gap:7px;flex-wrap:wrap}.dark-chip{border:1px solid #434850;background:#24282D;color:#F5F6F7;padding:7px 9px;border-radius:8px;font-weight:800;font-size:12px}.dark-chip.active{border-color:var(--orange);color:#FFB56F}.calc-screen{background:#0B0D10;border:1px solid #34383F;border-radius:15px;padding:15px;min-height:128px;color:#fff}.calc-expression{min-height:34px;color:#A5A9AF;font-size:16px;word-break:break-all}.calc-result{font-size:clamp(28px,5vw,43px);line-height:1.1;text-align:right;margin-top:18px;word-break:break-all;letter-spacing:-.025em}.calc-error{color:#FF9C94;font-size:13px;min-height:22px;margin-top:8px;text-align:right}.calc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}.calc-key{min-height:52px;border-radius:10px;border:1px solid #393E45;background:#24282E;color:#FAFAFA;font-size:15px;font-weight:750}.calc-key:hover{border-color:#6E747D}.calc-key.fn{color:#FFB36C;background:#20242A}.calc-key.action{color:#D7D9DC}.calc-key.operator{font-size:20px;color:#FFB36C}.calc-key.equal{background:var(--orange);border-color:var(--orange);color:#17120D;font-size:20px}.calc-key.wide{grid-column:span 2}.history-panel{border:1px solid #30343A;background:#1D2126;border-radius:16px;padding:14px;color:#fff;max-height:654px;overflow:auto}.history-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.history-head h3{font-size:14px;margin:0}.history-clear{border:0;background:none;color:#FFB36C;font-size:12px;font-weight:800}.history-empty{color:#8E939A;font-size:13px;padding:14px 0}.history-item{border-top:1px solid #353A41;padding:10px 0}.history-item:first-of-type{border-top:0}.history-item button{display:block;width:100%;text-align:right;border:0;background:none;color:#fff;padding:0}.history-item small{display:block;color:#969BA2;font-size:11px;word-break:break-all}.history-item strong{display:block;margin-top:4px;font-size:15px;word-break:break-all}
.field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.field-grid.three{grid-template-columns:repeat(3,1fr)}.field{display:flex;flex-direction:column;gap:7px}.field label{font-size:13px;font-weight:800}.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:10px;padding:12px 13px;color:var(--ink);outline:none}.field input:focus,.field select:focus,.field textarea:focus{border-color:#8F765E;box-shadow:0 0 0 3px rgba(143,118,94,.10)}.field textarea{min-height:90px;resize:vertical}.result-box{background:#F1ECE4;border:1px solid var(--line);border-radius:12px;padding:16px;margin-top:16px}.result-box strong.value{display:block;font-size:28px;letter-spacing:-.025em}.result-box pre{white-space:pre-wrap;word-break:break-word;margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}.form-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.small-btn{border:1px solid var(--ink);background:var(--ink);color:#fff;border-radius:9px;padding:10px 14px;font-weight:800}.small-btn.secondary{background:transparent;color:var(--ink);border-color:var(--line)}
.graph-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:16px}.graph-canvas-wrap{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;min-height:410px}.graph-canvas{width:100%;height:390px;display:block}.graph-legend{font-size:12px;color:var(--muted);margin-top:8px}.two-col-tools{display:grid;grid-template-columns:1fr 1fr;gap:16px}.stat-output{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;white-space:pre-wrap}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px;margin-top:15px}.data-table{border-collapse:collapse;width:100%;font-size:13px}.data-table th,.data-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:right}.data-table th{background:#F2ECE3;text-align:right}.data-table th:first-child,.data-table td:first-child{text-align:left}
.formula-controls{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-bottom:20px}.formula-controls input{flex:1;max-width:460px;border:1px solid var(--line);border-radius:10px;padding:12px 13px;background:#fff}.formula-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.formula-group{border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}.formula-group summary{list-style:none;padding:16px 18px;font-weight:850;cursor:pointer;display:flex;justify-content:space-between;gap:12px}.formula-group summary::-webkit-details-marker{display:none}.formula-group summary:after{content:"+";color:var(--orange-dark);font-size:20px}.formula-group[open] summary:after{content:"−"}.formula-images{border-top:1px solid var(--line);background:#fff;padding:12px}.formula-images img{display:block;width:100%;margin:0 auto 10px;border:1px solid #EEE8DF}.formula-images img:last-child{margin-bottom:0}
.prose{max-width:790px}.prose h2{font-size:30px;line-height:1.15;margin:42px 0 14px;letter-spacing:-.025em}.prose h3{margin-top:30px}.prose p,.prose li{color:#505258}.prose ul{padding-left:20px}.faq{max-width:880px}.faq details{border-top:1px solid var(--line);padding:18px 0}.faq summary{font-weight:850;cursor:pointer}.faq p{color:var(--muted);margin:10px 0 0}
.cta-band{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center;background:var(--orange);border:1px solid #D7771D;border-radius:22px;padding:30px}.cta-band h2{margin:0 0 8px;font-size:32px}.cta-band p{margin:0;max-width:680px}.cta-band .plain-btn{background:var(--ink);color:#fff;min-width:180px}
.site-footer{background:#0E1114;color:#fff;padding:56px 0 24px}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(2,1fr);gap:42px}.footer-brand p{color:#AEB2B8;max-width:450px}.footer-col h3{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:#8F949B}.footer-col a{display:block;color:#D7D9DD;margin:8px 0}.footer-bottom{border-top:1px solid #292D33;margin-top:38px;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#868B92;font-size:12px}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.62);z-index:80;display:none;align-items:center;justify-content:center;padding:20px}.modal.open{display:flex}.modal-card{width:min(470px,100%);background:var(--surface);border-radius:18px;padding:26px;border:1px solid var(--line);box-shadow:var(--shadow)}.modal-card h2{margin:0 0 10px}.modal-card p{color:var(--muted)}.modal-actions{display:flex;gap:10px;margin-top:20px}
@media (max-width:980px){.hero-grid{grid-template-columns:1fr;gap:36px}.hero-calculator{max-width:650px}.cards{grid-template-columns:repeat(2,1fr)}.tool-strip{grid-template-columns:repeat(2,1fr)}.tool-strip a:nth-child(2){border-right:0}.tool-strip a:nth-child(-n+2){border-bottom:1px solid var(--line)}.workspace{grid-template-columns:1fr}.tool-nav{position:static;display:flex;overflow:auto}.tool-nav a,.tool-nav button{width:auto;min-width:max-content}.calculator-shell{grid-template-columns:1fr}.history-panel{max-height:300px}.graph-layout{grid-template-columns:1fr}.formula-grid{grid-template-columns:1fr}}
@media (max-width:760px){.container{width:min(100% - 24px,var(--max))}.nav{min-height:66px}.nav-links{display:none;position:absolute;left:12px;right:12px;top:70px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px;flex-direction:column;align-items:stretch;box-shadow:var(--shadow)}.nav-links.open{display:flex}.menu-button{display:flex}.brand-sub{display:none}.hero{padding:50px 0}.hero h1,.page-hero h1{font-size:42px}.hero-lead,.page-lead{font-size:17px}.section{padding:56px 0}.section-head{display:block}.cards,.two-col-tools{grid-template-columns:1fr}.tool-strip{grid-template-columns:1fr}.tool-strip a{border-right:0;border-bottom:1px solid var(--line)}.tool-strip a:last-child{border-bottom:0}.field-grid,.field-grid.three{grid-template-columns:1fr}.panel{padding:15px}.calculator-card{padding:11px}.calc-grid{gap:6px}.calc-key{min-height:48px;font-size:14px}.calculator-shell{gap:10px}.graph-canvas-wrap{min-height:320px}.graph-canvas{height:300px}.formula-controls{display:block}.formula-controls input{max-width:none;width:100%;margin-bottom:10px}.cta-band{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-bottom{display:block}.announcement .container{justify-content:flex-start;overflow:hidden;white-space:nowrap}.announcement span{display:none}}
@media (max-width:420px){.calc-grid{grid-template-columns:repeat(4,1fr)}.calc-key[data-mobile-hide="true"]{display:none}.hero-actions{align-items:stretch}.store-badge img{height:50px}.proof-row{gap:12px}.page-hero{padding-top:34px}}
.calc-expression-input{width:100%;border:0;outline:0;background:transparent;color:#B9BDC4;font-size:17px;text-align:right;padding:0;min-height:34px}.calc-expression-input::placeholder{color:#5F646B}