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--tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}:root{--bg: #f6f5fb;--bg-2: #efeefa;--surface: #ffffff;--ink: #1c1b29;--ink-soft: #5a5870;--ink-faint: #8b89a3;--line: #e7e4f3;--line-soft: #f0eef9;--brand: #6d5efc;--brand-2: #c44ed9;--brand-deep: #5546e6;--gold: #d8a64a;--emerald: #16a06a;--emerald-soft: #e6f7ef;--rose: #e0577d;--tint: #f2f0fc;--radius: 20px;--radius-sm: 13px;--shadow-sm: 0 2px 8px rgba(40, 30, 90, .05);--shadow: 0 18px 50px -22px rgba(70, 50, 160, .28);--shadow-lg: 0 40px 90px -34px rgba(70, 50, 160, .4);--serif: "Fraunces", Georgia, serif;--grotesk: "Space Grotesk", sans-serif;--sans: "Inter", system-ui, sans-serif;--ease: cubic-bezier(.22, 1, .36, 1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:radial-gradient(1100px 600px at 85% -8%,#efe7ff 0%,transparent 55%),radial-gradient(900px 500px at 5% 0%,#ffe9fb 0%,transparent 50%),var(--bg);color:var(--ink);font-family:var(--sans);font-weight:400;line-height:1.6;-webkit-font-smoothing:antialiased}::selection{background:var(--brand);color:#fff}a{color:inherit}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:22px;padding:14px clamp(16px,4vw,48px);background:#ffffffc7;backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}.brand__mark{display:grid;place-items:center;filter:drop-shadow(0 6px 14px rgba(109,94,252,.35))}.brand__word{font-family:var(--grotesk);font-weight:700;font-size:1.18rem;letter-spacing:-.01em}.brand__word em{font-style:normal;color:var(--brand)}.topbar__crumb{display:flex;align-items:center;gap:8px;font-size:.84rem;color:var(--ink-faint)}.topbar__crumb a{text-decoration:none;color:var(--ink-faint)}.topbar__crumb a:hover{color:var(--brand)}.topbar__crumb b{color:var(--ink);font-weight:600}.topbar__links{margin-left:auto;display:flex;gap:clamp(10px,2vw,26px)}.topbar__links a{text-decoration:none;color:var(--ink-soft);font-size:.9rem;font-weight:500;transition:color .25s}.topbar__links a:hover{color:var(--brand)}@media(max-width:860px){.topbar__crumb{display:none}}@media(max-width:600px){.topbar__links a:nth-child(n+3){display:none}}.eyebrow{font-family:var(--grotesk);font-size:.76rem;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--brand)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--grotesk);font-size:.95rem;font-weight:600;padding:14px 24px;border-radius:100px;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:transform .25s var(--ease),box-shadow .25s,background .25s,color .25s}.btn:active{transform:translateY(1px)}.btn--go{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 28px -10px #6d5efc99;padding:14px 30px}.btn--go:hover{transform:translateY(-2px);box-shadow:0 18px 36px -10px #6d5efcbf}.btn--ghost{background:#fff;color:var(--ink);border-color:var(--line);box-shadow:var(--shadow-sm)}.btn--ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}.iconbtn{display:grid;place-items:center;width:50px;height:50px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--ink-soft);cursor:pointer;transition:all .25s}.iconbtn:hover{color:var(--brand);border-color:var(--brand)}.iconbtn--sm{width:auto;height:auto;padding:7px 13px;font-family:var(--grotesk);font-size:.82rem;gap:5px}.calc-hero{max-width:940px;margin:0 auto;padding:clamp(28px,5vw,56px) clamp(16px,4vw,32px) 40px}.calc-hero__intro{text-align:center;margin-bottom:30px}.calc-hero__intro h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.3rem,5.5vw,3.7rem);line-height:1.02;letter-spacing:-.015em}.calc-hero__intro p{color:var(--ink-soft);max-width:60ch;margin:16px auto 0;font-size:1.05rem}.calc{padding:clamp(18px,3vw,26px)}.ops{display:flex;flex-wrap:wrap;gap:7px;padding:6px;background:var(--bg-2);border-radius:100px;margin-bottom:18px}.op{flex:1 1 auto;min-width:max-content;padding:11px 16px;border:none;background:transparent;cursor:pointer;font-family:var(--grotesk);font-size:.92rem;font-weight:500;color:var(--ink-soft);border-radius:100px;transition:all .28s var(--ease)}.op:hover{color:var(--ink)}.op.is-active{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 18px -7px #6d5efc99}.inputbar{display:flex;align-items:stretch;gap:10px;position:relative}.suggest{position:absolute;top:calc(100% + 8px);left:0;right:0;z-index:45;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-lg);padding:7px;overflow:hidden}.suggest__row{display:flex;align-items:baseline;gap:9px;width:100%;text-align:left;background:none;border:none;padding:10px 16px;border-radius:11px;cursor:pointer;font-family:var(--grotesk);font-size:1.05rem;color:var(--ink);transition:background .15s}.suggest__row:hover{background:var(--tint)}.suggest__row i{font-family:var(--serif);font-style:italic;color:var(--ink-faint);font-size:.98rem;flex:0 0 auto}.suggest__row span{font-style:italic;color:var(--ink)}.suggest__row sup{font-size:.66em;vertical-align:super}.suggest__row sub{font-size:.66em;vertical-align:sub}.inputbar__field{position:relative;flex:1;min-width:0}#expr{width:100%;height:100%;min-height:64px;border:1.5px solid var(--line);border-radius:16px;padding:14px 18px 26px;font-family:var(--grotesk);font-size:1.5rem;color:var(--ink);background:#fff;transition:border .25s,box-shadow .25s}#expr:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px #6d5efc21}.mathfield{display:flex;align-items:center;width:100%;min-height:64px;box-sizing:border-box;border:1.5px solid var(--line)!important;border-radius:16px!important;padding:10px 18px!important;font-size:1.55rem;color:var(--ink);background:#fff;transition:border .25s,box-shadow .25s;cursor:text}.mathfield.mq-focused{border-color:var(--brand)!important;box-shadow:0 0 0 4px #6d5efc21;outline:none}.mathfield .mq-root-block{width:100%;padding:0}.mathfield.mq-empty .mq-root-block:after{content:"Enter a problem…";color:var(--ink-faint);font-size:1rem;font-family:var(--sans)}.mathfield,.mathfield *{font-family:Times New Roman,Symbola,serif}.inputbar__preview{position:absolute;left:19px;bottom:7px;font-size:.82rem;color:var(--ink-faint);font-family:var(--grotesk);pointer-events:none}.inputbar__preview sup{font-size:.7em}@media(max-width:560px){.inputbar{flex-wrap:wrap}.btn--go{flex:1}}.keypad{margin-top:14px;border:1px solid var(--line);border-radius:16px;padding:12px;background:var(--bg-2)}.keypad__bar{display:flex;align-items:center;gap:12px;margin-bottom:10px}.keypad__tabs{display:none;gap:6px;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}.keypad.is-full .keypad__tabs{display:flex}.keypad__tabs::-webkit-scrollbar{display:none}.ktab{flex:0 0 auto;padding:7px 14px;border:1px solid transparent;background:transparent;border-radius:100px;cursor:pointer;font-family:var(--grotesk);font-size:.85rem;color:var(--ink-soft);white-space:nowrap;transition:all .2s}.ktab:hover{color:var(--ink)}.ktab.is-active{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 5px 14px -5px #6d5efc99}.fullpad{display:inline-flex;align-items:center;gap:8px;cursor:pointer;flex:0 0 auto;user-select:none;margin-left:auto}.fullpad>span:first-child{font-family:var(--grotesk);font-size:.8rem;color:var(--ink-soft);white-space:nowrap}.fullpad input{position:absolute;opacity:0;width:0;height:0}.fullpad__track{position:relative;width:40px;height:22px;border-radius:100px;background:#d8d4ea;transition:background .25s var(--ease)}.fullpad__thumb{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #00000040;transition:transform .25s var(--ease)}.fullpad input:checked+.fullpad__track{background:linear-gradient(135deg,var(--brand),var(--brand-2))}.fullpad input:checked+.fullpad__track .fullpad__thumb{transform:translate(18px)}.keypad__body{position:relative}.keypad:not(.is-full) #kpBody{display:none}.keypad.is-full #kpCompact{display:none}.compact-templates button{font-size:.96rem}.compact-templates sub,.compact-numpad sub{font-size:.6em}.mini-toggle{display:flex;align-items:center;justify-content:center;width:100%;margin:9px 0 1px;padding:3px;background:none;border:none;cursor:pointer;color:var(--rose)}.mini-toggle svg{transition:transform .28s var(--ease)}.keypad.numpad-open .mini-toggle svg{transform:rotate(180deg)}.keypad .compact-numpad{display:none;margin-top:4px}.keypad.numpad-open .compact-numpad{display:grid}@media(max-width:760px){.compact-templates{grid-template-columns:repeat(6,minmax(0,1fr))!important}}.keypad__grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px}.keypad__grid button{min-width:0}#kpBody .keypad__grid{grid-template-columns:repeat(auto-fit,minmax(62px,1fr))}.keypad__grid.is-hidden{display:none}.keypad__grid .k-seg{color:var(--ink-soft);font-size:.82rem}.keypad__grid .k-seg.is-on{background:var(--emerald);border-color:var(--emerald);color:#fff}.keypad__grid .k-eq{background:var(--emerald);border-color:var(--emerald);color:#fff;font-weight:700}.keypad__grid .k-eq:hover{background:#128a5b;border-color:#128a5b;color:#fff}.keypad__grid button{padding:12px 0;border:1px solid var(--line);background:#fff;border-radius:11px;cursor:pointer;font-family:var(--grotesk);font-size:1.02rem;color:var(--ink);transition:all .15s;box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:center;min-height:44px}.keypad__grid button:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px);box-shadow:0 6px 14px -6px #6d5efc66}.keypad__grid button sup{font-size:.62em}.keypad__grid .k-op{color:var(--brand);font-weight:600}.keypad__grid .k-op2{color:var(--brand-2);font-weight:600;font-size:.92rem}.keypad__grid .k-var{color:var(--brand-2);font-style:italic}.keypad__grid .k-num{font-weight:500}.keypad__grid .k-fn{background:var(--ink);color:#fff;border-color:var(--ink)}.keypad__grid .k-fn:hover{background:var(--brand);border-color:var(--brand);color:#fff}.keypad__grid .k-full{display:none}.keypad.is-full .keypad__grid .k-full{display:flex}@media(max-width:560px){.keypad__grid{grid-template-columns:repeat(5,minmax(0,1fr))}}@media(max-width:420px){.keypad__grid{grid-template-columns:repeat(4,minmax(0,1fr))}}.quick{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px}.quick__label{font-size:.82rem;color:var(--ink-faint);font-weight:500}.chip{padding:8px 14px;border:1px solid var(--line);background:#fff;border-radius:100px;cursor:pointer;font-family:var(--grotesk);font-size:.85rem;color:var(--ink-soft);transition:all .22s}.chip:hover{border-color:var(--brand);color:var(--brand);background:var(--tint);transform:translateY(-1px)}.calc__error{color:var(--rose);min-height:18px;margin-top:12px;font-size:.9rem;font-weight:500}.result{max-width:940px;margin:20px auto 0;padding:clamp(20px,3vw,30px);animation:rise .5s var(--ease)}@keyframes rise{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}.result__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.result__op{font-family:var(--grotesk);font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint)}.result__value{font-family:var(--serif);font-size:clamp(2.2rem,5.2vw,3.4rem);color:var(--brand-deep);line-height:1.15;word-break:break-word}.result__value sup{font-size:.56em;vertical-align:super}.result__value .rf{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 .12em}.result__value .rf .bar{height:3px;background:var(--brand-deep);border-radius:3px;margin:3px 0}.result__forms{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 6px}.result__forms .form{background:var(--tint);border:1px solid var(--line);border-radius:12px;padding:10px 15px;font-family:var(--grotesk)}.result__forms .form b{display:block;font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;margin-bottom:3px}.result__forms .form span{font-size:1.04rem;color:var(--ink)}.result__forms .form sup{font-size:.66em;vertical-align:super}.steps{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.steps summary{font-family:var(--grotesk);font-size:.9rem;font-weight:600;color:var(--ink);cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px}.steps summary:before{content:"▸";color:var(--brand);transition:transform .25s}.steps[open] summary:before{transform:rotate(90deg)}.steps ol{list-style:none;counter-reset:s;margin-top:16px;display:flex;flex-direction:column;gap:12px}.steps li{counter-increment:s;position:relative;padding-left:42px;color:var(--ink-soft);font-size:.98rem;opacity:0;transform:translate(-6px);animation:stepIn .45s var(--ease) forwards}.steps li:before{content:counter(s);position:absolute;left:0;top:-2px;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--tint);color:var(--brand);font-family:var(--grotesk);font-size:.82rem;font-weight:600;border:1px solid var(--line)}.steps li b{color:var(--ink)}.steps li sup{font-size:.66em;vertical-align:super}.steps li .rf{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 .18em;line-height:1.05}.steps li .rf .bar{height:2px;background:currentColor;border-radius:2px;margin:2px 0;opacity:.7}.steps li b .rf{color:var(--brand-deep)}@keyframes stepIn{to{opacity:1;transform:none}}.section{padding:clamp(34px,4.5vh,56px) clamp(16px,5vw,64px)}.section+.section:not(.section--tint){padding-top:0}.section--tint{background:linear-gradient(180deg,transparent,var(--tint) 14%,var(--tint) 86%,transparent)}.section__head{max-width:680px;margin:0 auto clamp(26px,3.5vw,40px);text-align:center}.section__head h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.06;letter-spacing:-.015em;margin-top:12px}.section__sub{color:var(--ink-soft);margin-top:14px;font-size:1.04rem}.flow{max-width:1120px;margin:0 auto;padding:clamp(26px,4vw,44px)}.flow__rail{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.flow__line{position:absolute;top:27px;left:0;width:100%;height:6px;z-index:0}.flow__line-base{stroke:var(--line);stroke-width:3;stroke-linecap:round}.flow__line-glow{stroke:url(#grad);stroke:var(--brand);stroke-width:3;stroke-linecap:round;stroke-dasharray:1000;stroke-dashoffset:1000;filter:drop-shadow(0 0 4px rgba(109,94,252,.5));transition:stroke-dashoffset 2.2s var(--ease)}.flow__line-glow.is-flowing{stroke-dashoffset:0}.stage{position:relative;z-index:1;text-align:center}.stage__orb{width:56px;height:56px;margin:0 auto 16px;border-radius:50%;display:grid;place-items:center;background:#fff;border:2px solid var(--line);transition:all .5s var(--ease)}.stage__orb span{font-family:var(--grotesk);font-size:.8rem;color:var(--ink-faint);font-weight:600;transition:color .5s}.stage.is-active .stage__orb{border-color:var(--brand);background:var(--tint);box-shadow:0 0 0 6px #6d5efc1a,0 10px 24px -8px #6d5efc80;transform:scale(1.08)}.stage.is-active .stage__orb span{color:var(--brand)}.stage__orb--final.is-lit{border-color:var(--emerald);background:var(--emerald-soft);box-shadow:0 0 0 6px #16a06a1a,0 10px 24px -8px #16a06a80}.stage h4{font-family:var(--serif);font-weight:500;font-size:1.3rem}.stage p{font-size:.85rem;color:var(--ink-soft);margin:6px 0 12px;min-height:38px}.stage__box{background:var(--bg-2);border:1px solid var(--line);border-radius:12px;padding:12px;font-family:var(--grotesk);font-size:1.2rem;color:var(--ink);min-height:50px;display:grid;place-items:center;transition:opacity .5s;opacity:.45}.stage.is-active .stage__box{opacity:1}.stage__box sup{font-size:.66em;vertical-align:super}.stage__box .rf{display:inline-flex;flex-direction:column;text-align:center}.stage__box .rf .bar{height:2px;background:var(--ink);margin:2px 0}.stage__box--final{color:var(--emerald);font-weight:600}.stage__box--final .rf 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