:root{color-scheme:light;--ink:#1d2b3d;--muted:#68798a;--soft:#eef4f8;--line:#dce7ee;--blue:#45b8e8;--blue-deep:#168ec2;--blue-pale:#eaf7fd;--orange:#ff8b45;--orange-pale:#fff3e9;--navy:#252f64;--white:#fff;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;scroll-behavior:smooth;font-family:Square721 BT,DM Sans,sans-serif}body,body *{font-family:Square721 BT,DM Sans,sans-serif!important}:root[data-color-theme=pink]{--blue:#e88caf;--blue-deep:#c94f7d;--blue-pale:#fff0f6;--orange:#f08b68;--orange-pale:#fff1eb}:root[data-color-theme=pink] .section-band{background:#f8dce7}:root[data-color-theme=pink] .band-inner h2{color:#79445b}:root[data-color-theme=pink] .band-inner>span{color:#95647a}:root[data-color-theme=pink] .eyebrow,:root[data-color-theme=pink] .hero h1 em,:root[data-color-theme=pink] .quick-icon{color:var(--blue-deep)}:root[data-color-theme=pink] .quick-next{color:var(--blue-deep);background:var(--blue-pale)}:root[data-color-theme=pink] .mode-tab[aria-selected=true]{color:var(--blue-deep)}:root[data-color-theme=pink] .heading-icon{color:var(--blue-deep);background:var(--blue-pale)}*{box-sizing:border-box}body{color:var(--ink);background:#f7fafc;margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,select,a{-webkit-tap-highlight-color:transparent}.wrap{width:min(1180px,100% - 48px);margin-inline:auto}.site-header{border-bottom:1px solid #e6edf2;justify-content:space-between;align-items:center;gap:28px;min-height:98px;display:flex;position:relative}.brand{flex:none;align-items:center;gap:11px;display:inline-flex}.brand-logo{object-fit:contain;object-position:left center;width:225px;height:auto;max-height:54px;display:block}.header-right{justify-items:end;gap:6px;display:grid;position:relative}.header-tools{align-items:center;gap:7px;display:flex}.header-date{color:#697b8c;white-space:nowrap;background:#fbfdfe;border:1px solid #e4ebef;border-radius:6px;align-items:center;gap:6px;margin-right:7px;padding:5px 8px;font-size:9px;display:flex}.header-date svg{fill:none;stroke:#71899a;stroke-width:1.5px;stroke-linecap:round;stroke-linejoin:round;width:15px;height:15px}.header-date-copy{gap:2px;display:grid}.header-date-copy>time{color:#556a7a;letter-spacing:.25px;font-size:8px;font-weight:700}.header-time-row{color:#516a7c;align-items:center;gap:5px;font-size:10px;font-weight:700;display:flex}.header-time-row small{color:#718b9a;letter-spacing:.6px;font-size:7px;font-weight:700}.header-icon-button{color:#65788b;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:6px;flex:0 0 33px;justify-content:center;align-items:center;gap:4px;width:33px;height:33px;padding:0;display:inline-flex}.header-icon-button:hover,.header-icon-button:focus-visible{color:var(--blue-deep);background:#edf8fc;border-color:#dce9ef;outline:none}.header-icon-button svg{fill:none;stroke:currentColor;stroke-width:1.5px;stroke-linecap:round;stroke-linejoin:round;width:21px;height:21px}.theme-toggle svg{width:22px}.theme-blue{fill:#75c9e7;stroke:#3e9fbe}.theme-pink{fill:#ef9eb9;stroke:#d26f91}.language-control{position:relative}.language-control summary{cursor:pointer;width:auto;min-width:77px;list-style:none}.language-control summary::-webkit-details-marker{display:none}.language-control summary svg{width:18px;height:18px}.language-letters{color:#5e7183;background:#fff;margin-left:-14px;padding:0 2px;font-size:7px;font-weight:700}.language-label{font-size:9px}.chevron{margin-left:-3px;font-size:12px}.language-menu{z-index:30;background:#fff;border:1px solid #e1e9ee;border-radius:8px;gap:5px;width:170px;padding:11px;display:grid;position:absolute;top:calc(100% + 7px);right:0;box-shadow:0 12px 30px #22364a1c}.language-menu button{color:#53697b;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:5px;padding:8px;font-size:10px}.language-menu button:hover,.language-menu button[aria-pressed=true]{color:var(--blue-deep);background:var(--blue-pale)}.menu-toggle svg{stroke-width:2.2px;width:22px}.menu-line-orange{stroke:#f49a58}.menu-line-gray{stroke:#39454e}.menu-line-red{stroke:#d9534f}.header-search-row{align-items:center;gap:7px;display:flex}.search-badge{color:#2189a8;background:#f1fbff;border:1px solid #cfe3ea;border-radius:50%;flex:0 0 30px;place-items:center;width:30px;height:30px;display:grid;position:relative}.search-badge svg{fill:none;stroke:#49a8c4;stroke-width:1.2px;stroke-linecap:round;stroke-linejoin:round;width:24px;height:24px;position:absolute;inset:2px}.search-badge b{font:700 11px Space Grotesk,sans-serif;position:relative}.site-search{color:#7690a2;background:#fff;border:1px solid #cddce4;border-radius:7px;align-items:center;gap:9px;width:min(405px,42vw);height:36px;padding:0 8px 0 12px;display:flex;box-shadow:0 2px 6px #263d5010}.site-search:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb, var(--blue) 20%, transparent)}.site-search input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0;font-size:11px}.site-search input::placeholder{color:#96a5b0}.site-search button{color:#667a8b;cursor:pointer;background:0 0;border:0;flex:0 0 24px;place-items:center;width:24px;height:26px;padding:0;display:grid}.site-search button svg{fill:none;stroke:currentColor;stroke-width:1.7px;stroke-linecap:round;width:17px;height:17px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}.header-popover{z-index:25;color:#53697b;background:#fff;border:1px solid #e1e9ee;border-radius:7px;max-width:250px;padding:10px 12px;font-size:10px;line-height:1.5;position:absolute;top:39px;right:37px;box-shadow:0 10px 24px #22364a1a}.header-popover[hidden],.header-menu[hidden]{display:none}.header-menu{z-index:24;background:#fff;border:1px solid #e1e9ee;border-radius:8px;min-width:185px;padding:6px;display:grid;position:absolute;top:calc(100% + 7px);right:0;box-shadow:0 12px 30px #22364a1c}.header-menu a{color:#53697b;border-radius:5px;padding:10px;font-size:11px}.header-menu a:hover{color:var(--blue-deep);background:var(--blue-pale)}.quick-access{padding-block:14px 18px}.section-mini-title{color:#708091;letter-spacing:1.3px;align-items:center;gap:8px;font-size:9px;font-weight:700;display:flex}.section-mini-title .muted{color:#a0aeb9;letter-spacing:0;margin-left:4px;font-size:10px;font-weight:400}.pulse-dot,.save-dot{background:#42bca7;border-radius:50%;width:7px;height:7px;display:inline-block;box-shadow:0 0 0 3px #42bca71c}.quick-rail{scrollbar-width:none;align-items:stretch;gap:8px;padding:11px 0 1px;display:flex;overflow-x:auto}.quick-rail::-webkit-scrollbar{display:none}.quick-item{color:#47596a;background:#fff;border:1px solid #e3ebf0;border-radius:8px;flex:none;align-items:center;gap:9px;min-width:145px;padding:10px 12px;font-size:11px;transition:border .18s,transform .18s;display:flex}.quick-item:hover{border-color:#95d7ef;transform:translateY(-2px)}.quick-icon{background:var(--blue-pale);color:#168fbc;border-radius:7px;place-items:center;width:28px;height:28px;font-size:15px;font-weight:700;display:grid}.quick-next{color:#168fbc;background:#dff4fd;border-radius:8px;flex:0 0 35px;place-items:center;width:35px;font-size:22px;display:grid}.hero{grid-template-columns:1.08fr .92fr;align-items:center;gap:40px;min-height:335px;padding-block:40px 53px;display:grid}.hero-copy{padding-left:clamp(0px,3vw,35px)}.eyebrow{color:#328bb1;letter-spacing:1.4px;align-items:center;gap:9px;margin:0 0 12px;font-size:9px;font-weight:700;display:flex}.eyebrow-line{background:var(--orange);width:19px;height:1px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:Space Grotesk,sans-serif}.hero h1{color:#22334a;letter-spacing:-3.1px;margin:0;font-size:clamp(40px,5.5vw,64px);line-height:.98}.hero h1 em{color:#27a8d4;font-style:normal}.hero-description{color:#647588;max-width:475px;margin:17px 0 25px;font-size:14px;line-height:1.7}.hero-stats{align-items:center;gap:20px;display:flex}.hero-stats div{gap:2px;display:grid}.hero-stats strong{color:var(--navy);font:700 19px Space Grotesk,sans-serif}.hero-stats span{color:#7d8b98;font-size:10px}.hero-stats i{background:#dae4eb;width:1px;height:28px}.hero-visual{justify-self:center;place-items:center;width:min(100%,450px);height:260px;display:grid;position:relative}.orbit{border:1px solid #caeaf5;border-radius:50%;width:260px;height:260px;position:absolute}.orbit-two{border-style:dashed;border-color:#e7dacc;width:210px;height:210px}.visual-card{z-index:1;background:#fff;border:1px solid #e2edf2;border-radius:13px;position:absolute;box-shadow:0 18px 45px #244a6118}.visual-card-main{width:250px;padding:18px 20px 15px;transform:rotate(-4deg)}.visual-top{color:#8292a1;letter-spacing:1.2px;justify-content:space-between;font-size:8px;font-weight:700;display:flex}.visual-spark{color:var(--orange);font-size:17px}.visual-card-main>strong{color:#25355f;letter-spacing:1px;margin:11px 0;font:600 35px Space Grotesk,sans-serif;display:block}.visual-rule{background:#e9eff2;height:1px}.visual-bars{align-items:end;gap:6px;height:48px;padding:5px 3px 0;display:flex}.visual-bars i{background:#a5e3f4;border-radius:3px 3px 0 0;flex:1;height:38%}.visual-bars i:nth-child(2){height:67%}.visual-bars i:nth-child(3){height:50%}.visual-bars i:nth-child(4){background:#ffba8f;height:84%}.visual-bars i:nth-child(5){height:58%}.visual-bars i:nth-child(6){background:#58c4e3;height:94%}.visual-bars i:nth-child(7){height:73%}.visual-card-main small{color:#93a0aa;margin-top:10px;font-size:9px;display:block}.visual-card-float{color:#58697a;align-items:center;gap:9px;padding:11px 13px;font-size:10px;line-height:1.4;display:flex;bottom:20px;right:4%;transform:rotate(4deg)}.float-icon{color:#ed8241;background:#fff1e6;border-radius:8px;place-items:center;width:28px;height:28px;font-size:18px;display:grid}.visual-star{color:#39b2dc;font-size:21px;position:absolute}.star-one{top:22px;left:14%}.star-two{color:#ff9a5c;font-size:14px;top:54px;right:14%}.visual-dot{background:#9fdff0;border-radius:50%;width:9px;height:9px;position:absolute;bottom:45px;left:13%}.section-band{background:#a7dff3}.band-inner{justify-content:space-between;align-items:center;gap:15px;min-height:50px;display:flex}.band-inner h2{color:#1b4460;margin:0;font-size:15px;font-weight:600}.band-inner>span{color:#39738e;font-size:11px}.workspace-section{padding-block:22px 46px}.workspace-grid{grid-template-columns:minmax(0,1fr) minmax(175px,.28fr);align-items:stretch;gap:15px;display:grid}.calculator-notebook{grid-template-columns:minmax(255px,.82fr) minmax(300px,1fr);align-items:stretch;gap:15px;min-width:0;display:grid}.calculator-panel,.notes-panel{background:#fff;border:1px solid #e2eaf0;border-radius:11px;min-width:0;padding:20px;box-shadow:0 7px 24px #25486708}.panel-heading{align-items:center;gap:11px;min-width:0;display:flex}.heading-icon{color:#1699c4;background:#e7f6fc;border-radius:10px;flex:0 0 40px;place-items:center;width:40px;height:40px;font:600 18px Space Grotesk,sans-serif;display:grid}.panel-heading .eyebrow{margin-bottom:3px;font-size:8px}.panel-heading h2,.panel-heading h1{color:#24354d;margin:0;font-size:17px;line-height:1.2}.heading-link{white-space:nowrap;margin-left:auto;font-size:10px!important}.fullscreen-button{color:#52697a;cursor:pointer;background:#fff;border:1px solid #dce6eb;border-radius:7px;flex:0 0 34px;place-items:center;width:34px;height:34px;margin-left:2px;padding:0;transition:color .15s,background .15s,border-color .15s;display:grid}.fullscreen-button:hover,.fullscreen-button.is-active{color:#087ea5;background:#eefaff;border-color:#a8dced}.fullscreen-button:focus-visible{outline-offset:2px;outline:2px solid #53bee4}.fullscreen-button svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}.panel-description{color:#778594;margin:14px 0 16px;font-size:11px;line-height:1.55}.calc-fields{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px 11px;display:grid}.field{color:#596b7d;gap:6px;min-width:0;font-size:10px;font-weight:600;display:grid}.field[hidden]{display:none}.field input,.field select{color:#304257;background:#fbfdfe;border:1px solid #dce6eb;border-radius:6px;outline:none;width:100%;min-width:0;height:39px;padding:0 10px;font-size:12px;font-weight:400}.field input:focus,.field select:focus,.site-search:focus-within{border-color:#4db8dc;box-shadow:0 0 0 3px #4db8dc20}.field input::placeholder{color:#a6b2bc}.form-actions{align-items:center;gap:8px;margin-top:14px;display:flex}.button{cursor:pointer;border:0;border-radius:6px;justify-content:center;align-items:center;gap:10px;min-height:39px;padding:0 15px;font-size:11px;font-weight:700;transition:transform .18s,background .18s;display:inline-flex}.button:hover{transform:translateY(-1px)}.button-primary{color:#fff;background:var(--orange);box-shadow:0 5px 12px #ff8b4532}.button-primary:hover{background:#f47c35}.button-secondary{color:#197da2;background:#e7f6fc}.button-quiet{color:#738294;background:0 0}.result-box{background:#f0faff;border:1px solid #cde9f4;border-radius:7px;gap:4px;margin-top:15px;padding:13px 15px;display:grid}.result-box[hidden],.form-error[hidden]{display:none}.result-label{color:#6591a4;letter-spacing:1px;text-transform:uppercase;font-size:9px;font-weight:700}.result-box strong{color:#1f5270;overflow-wrap:anywhere;font:600 23px Space Grotesk,sans-serif}.result-box [data-result-note]{color:#718494;font-size:10px;line-height:1.5}.form-error{color:#a44e37;background:#fff4ef;border-radius:6px;margin:12px 0 0;padding:9px 11px;font-size:11px}.calculator-mode-switch{background:#f1f5f7;border:1px solid #dce6eb;border-radius:8px;grid-template-columns:1fr 1fr;gap:3px;width:min(100%,355px);margin:13px auto -7px;padding:3px;display:grid}.mode-tab{color:#728293;cursor:pointer;background:0 0;border:0;border-radius:6px;min-height:32px;font-size:10px;font-weight:700}.mode-tab[aria-selected=true]{color:#187fa6;background:#fff;box-shadow:0 1px 4px #29475b20}.mode-tab:focus-visible{outline-offset:1px;outline:2px solid #53bee4}.basic-calculator{background:linear-gradient(145deg,#666768,#464748 72%);border:5px solid #393a3b;border-radius:20px;outline:none;width:min(100%,355px);margin:14px auto 0;padding:14px;box-shadow:inset 0 2px 5px #ffffff30,0 9px 18px #1d27312b}.basic-calculator:focus-visible{box-shadow:0 0 0 3px #53bee4,inset 0 2px 5px #ffffff30,0 9px 18px #1d27312b}.basic-calculator[data-mode=scientific]{background:linear-gradient(145deg,#56595b,#383b3e 76%);border:6px solid #292c2e;border-radius:25px;margin-top:14px;padding:12px;box-shadow:inset 0 2px 5px #ffffff24,0 10px 20px #1d273132}.scientific-bezel-label{color:#d2d6d7;letter-spacing:1.7px;margin:0 3px 7px;font:700 8px Space Grotesk,sans-serif}.scientific-bezel-label span{color:#96bec8;margin-left:5px;font-weight:500}.scientific-bezel-label[hidden]{display:none}.calculator-screen{color:#19211a;background:linear-gradient(#dce0c4,#c8cdae);border:4px solid #ced2b5;border-radius:12px;flex-direction:column;justify-content:center;gap:1px;min-height:76px;margin-bottom:13px;padding:8px 12px 6px;display:flex;overflow:hidden;box-shadow:inset 0 3px 8px #39412f38,0 2px 2px #fff4}.calculator-expression{color:#65705c;text-align:right;white-space:nowrap;min-height:14px;font:500 10px DM Sans,sans-serif;overflow:hidden}.calculator-display{color:#121813;text-align:right;text-overflow:clip;white-space:nowrap;letter-spacing:1px;font-variant-numeric:tabular-nums;font:500 clamp(27px,3vw,39px)/1 Space Grotesk,monospace;display:block;overflow:hidden}.calculator-keypad{grid-template-rows:repeat(5,minmax(48px,auto));grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;display:grid}.science-keypad{grid-template-columns:repeat(5,minmax(0,1fr));gap:5px;margin-bottom:8px;display:grid}.science-keypad[hidden],.basic-calculator[data-mode=scientific] .calculator-keypad[hidden]{display:none}.basic-calculator[data-mode=scientific] .calculator-keypad{grid-template-rows:repeat(5,minmax(39px,auto));grid-template-columns:repeat(4,minmax(0,1fr));gap:5px}.basic-calculator[data-mode=scientific] .key{background:linear-gradient(145deg,#74787a,#55595b);border-color:#666a6d;border-radius:7px;min-height:39px;font-size:17px}.basic-calculator[data-mode=scientific] .key-power{background:linear-gradient(145deg,#ff5b56,#e73b3e);border-color:#f45551;font-size:13px}.basic-calculator[data-mode=scientific] .key-operator{background:linear-gradient(145deg,#4f5355,#383b3d);border-color:#505456}.basic-calculator[data-mode=scientific] .key-equals{background:linear-gradient(145deg,#ffa04f,#ff8435);border-color:#ff9c56}.key-science{background:linear-gradient(145deg,#63686a,#45494b);border-color:#5d6264;border-radius:6px;min-height:34px;padding:0 3px;font-size:11px}.key-science.key-shift{color:#ffe083}.key-science.is-active{color:#342917;background:linear-gradient(145deg,#ffe28c,#e7bd50);border-color:#ffd972}.basic-calculator[data-mode=scientific] .calculator-hint{color:#c3c8ca}.key{color:#fff;cursor:pointer;text-shadow:0 1px 1px #0002;background:linear-gradient(145deg,#999a9b,#777879);border:1px solid #bababa;border-radius:8px;min-width:0;min-height:48px;font:700 20px Space Grotesk,sans-serif;transition:filter .12s,transform .12s,box-shadow .12s;box-shadow:inset 0 2px 2px #ffffff42,inset 0 -3px 2px #00000020,0 3px 2px #272829}.key:hover{filter:brightness(1.08)}.key:active{transform:translateY(2px);box-shadow:inset 0 2px 4px #00000030}.key:focus-visible{outline-offset:1px;outline:2px solid #8de5ff}.key-power{color:#fff;background:linear-gradient(145deg,#ff5552,#e83136);border-color:#ff4d4d;font-size:15px}.key-operator{background:linear-gradient(145deg,#525354,#3f4041);border-color:#656667;font-size:21px}.key-equals{background:linear-gradient(145deg,#ffa04f,#ff8435);border-color:#ff9c56;grid-area:4/4/span 2;font-size:24px}.calculator-hint{color:#c7c9c9;text-align:center;margin:10px 0 0;font-size:9px}.formula-note{color:#748393;background:#f5f8fa;border-radius:7px;align-items:flex-start;gap:10px;margin-top:17px;padding:12px;font-size:10px;line-height:1.55;display:flex}.formula-note strong{color:#3e5367;font-size:10px}.formula-symbol{color:#188daf;background:#e3f4fa;border-radius:6px;flex:0 0 23px;place-items:center;width:23px;height:23px;font-size:12px;font-weight:700;display:grid}.notes-panel{flex-direction:column;min-height:455px;padding:18px;display:flex}.notes-heading{border-bottom:1px solid #edf0f2;align-items:center;gap:9px;padding-bottom:12px;display:flex}.notes-icon{color:#e98448;background:#fff1e6;border-radius:7px;place-items:center;width:29px;height:29px;display:grid}.notes-heading h3{margin:0 0 2px;font-size:13px}.notes-heading p{color:#8996a2;margin:0;font-size:9px}.notebook-paper{background:repeating-linear-gradient(#fff 0 34px,#dce7ec 35px,#fff 36px);border:1px solid #e2e9ed;border-radius:6px;flex:1;min-height:330px;margin-top:11px;position:relative;overflow:auto}.history-lines{flex-direction:column;gap:0;min-height:100%;margin:0;padding:0 12px;list-style:none;display:flex}.history-lines li{color:#657688;border-bottom:1px solid #e2eaf0;justify-content:space-between;align-items:center;gap:8px;min-height:36px;font:11px/1.3 DM Sans,sans-serif;display:flex}.history-expression{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.history-result{color:#263d57;flex:none;font-weight:700}.history-empty{color:#a0adb6;margin:0;font-size:10px;position:absolute;top:12px;left:12px}.history-empty[hidden]{display:none}.notes-foot{color:#93a0aa;justify-content:space-between;align-items:center;margin-top:9px;font-size:9px;display:flex}.notes-foot>span{align-items:center;gap:6px;display:flex}.calculator-notebook:fullscreen,.calculator-notebook.is-fullscreen{background:#f4f8fb;border:0;border-radius:0;grid-template-columns:minmax(300px,.82fr) minmax(360px,1fr);gap:22px;width:100vw;max-width:none;height:100vh;min-height:0;margin:0;padding:22px;overflow:auto}.calculator-notebook:fullscreen .calculator-panel,.calculator-notebook:fullscreen .notes-panel,.calculator-notebook.is-fullscreen .calculator-panel,.calculator-notebook.is-fullscreen .notes-panel{height:100%;min-height:0;overflow:auto}.calculator-notebook:fullscreen .notebook-paper,.calculator-notebook.is-fullscreen .notebook-paper{min-height:0}body.calculator-fullscreen-fallback{overflow:hidden}body.calculator-fullscreen-fallback .calculator-notebook.is-fullscreen{z-index:10000;position:fixed;inset:0}.save-dot{width:6px;height:6px}.notes-foot button{color:#6e91a2;cursor:pointer;background:0 0;border:0;padding:4px;font-size:9px}.ad-slot{color:#8796a1;background:#f0f4f6;border:1px dashed #c7d6df;border-radius:9px;place-items:center;min-width:0;min-height:270px;display:grid;position:relative;overflow:hidden}.ad-label{text-align:center;color:#a4b0b8;letter-spacing:1.2px;font-size:8px;font-weight:700;position:absolute;top:11px;left:0;right:0}.ad-content{text-align:center;gap:6px;display:grid}.ad-content b{color:#85949f;font:600 14px Space Grotesk,sans-serif}.ad-content small{color:#9aa7b0;max-width:135px;font-size:9px;line-height:1.45}.popular-section{padding-block:9px 54px}.section-heading{justify-content:space-between;align-items:end;gap:18px;margin-bottom:18px;display:flex}.section-heading .eyebrow{margin-bottom:5px}.section-heading h2{color:#24364e;letter-spacing:-.6px;margin:0;font-size:24px}.text-link{color:#218db4;align-items:center;gap:7px;font-size:11px;font-weight:700;display:inline-flex}.text-link:hover{color:#ef8140}.tool-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;display:grid}.tool-card{background:#fff;border:1px solid #e0e9ef;border-radius:9px;flex-direction:column;min-height:170px;padding:15px;transition:transform .18s,border .18s,box-shadow .18s;display:flex}.tool-card:hover{border-color:#a6dced;transform:translateY(-3px);box-shadow:0 9px 25px #28556b12}.tool-card[hidden]{display:none}.tool-card-top{justify-content:space-between;align-items:center;margin-bottom:11px;display:flex}.tool-icon{color:#168db9;background:#e7f7fc;border-radius:8px;place-items:center;width:32px;height:32px;font:600 15px Space Grotesk,sans-serif;display:grid}.tool-card:nth-child(3n+2) .tool-icon{color:#b66c31;background:#fff1e5}.tool-card:nth-child(4n) .tool-icon{color:#4f69a6;background:#edf1fc}.tool-arrow{color:#9db1be;font-size:14px}.tool-card h3{color:#304256;margin:0 0 6px;font-size:13px;line-height:1.3}.tool-card p{color:#7d8b98;margin:0 0 11px;font-size:10px;line-height:1.5}.tool-category{color:#3994b3;margin-top:auto;font-size:9px;font-weight:600}.search-empty{color:#68798a;text-align:center;padding:25px;font-size:12px}.category-section{background:#fff;border-block:1px solid #e8eef2;padding-block:38px 45px}.category-heading{align-items:center}.category-heading>span{color:#7d8b98;font-size:11px}.category-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;display:grid}.category-card{text-align:center;background:#fcfdfe;border:1px solid #e3ebf0;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;gap:9px;min-height:116px;padding:14px 12px;transition:border .18s,background .18s;display:flex;position:relative}.category-card:hover{background:#f5fcff;border-color:#79cfe8}.category-icon{color:#238fb2;background:#e8f7fc;border-radius:9px;place-items:center;width:36px;height:36px;font:600 17px Space Grotesk,sans-serif;display:grid}.category-label{justify-items:center;gap:4px;display:grid}.category-label strong{color:#3b4e61;font:600 11px Space Grotesk,sans-serif}.category-label small{color:#8896a2;font-size:9px}.category-arrow{color:#9aadb9;position:absolute;top:9px;right:11px}.category-all{background:#fff2e7;border-color:#ffe1c6}.category-all .category-icon{color:#171a1d;background:#fff;border-color:#171a1d}.about-section{grid-template-columns:150px 1.15fr 1fr;align-items:center;gap:36px;padding-block:66px;display:grid}.about-mark{background:radial-gradient(circle at 32% 28%,#e9f9fd,#c9edf8 56%,#f9e7d8);border-radius:50%;place-items:center;width:138px;height:138px;display:grid;position:relative}.about-mark-ring{color:#218cac;background:#ffffffa8;border:1px solid #86cce0;border-radius:24px 24px 24px 5px;place-items:center;width:81px;height:81px;font:700 40px Space Grotesk,sans-serif;display:grid;transform:rotate(-9deg)}.about-mark-star{color:var(--orange);font-size:25px;position:absolute;top:16px;right:3px}.about-copy h2{color:#273b53;letter-spacing:-.7px;margin:0 0 12px;font-size:26px;line-height:1.14}.about-copy>p:not(.eyebrow){color:#718191;max-width:470px;font-size:11px;line-height:1.75}.about-points{gap:14px;display:grid}.about-points>div{border-bottom:1px solid #e8edf0;align-items:flex-start;gap:11px;padding-bottom:12px;display:flex}.about-points>div:last-child{border:0;padding:0}.about-points>div>span{color:#f08a4a;font:600 11px Space Grotesk,sans-serif}.about-points p{color:#798897;margin:0;font-size:10px;line-height:1.5}.about-points strong{color:#455a6d;font-size:11px}.about-story{color:#718191;border-top:1px solid #e8edf0;grid-column:1/-1;max-width:950px;margin:4px auto 0;padding-top:23px;font-size:12px;line-height:1.8}.about-story h3{color:#34495f;margin:0 0 12px;font:600 18px Space Grotesk,sans-serif}.about-story p{margin:0 0 13px}.about-story p:last-child{margin-bottom:0}.ad-banner{color:#9aa7b0;background:#f0f4f6;border:1px dashed #c7d6df;border-radius:9px;justify-content:center;align-items:center;min-height:95px;margin-bottom:55px;font-size:10px;display:flex;position:relative}.ad-banner .ad-label{top:12px}.faq-section{padding-bottom:62px}.faq-section .section-heading{margin-bottom:17px}.faq-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px 12px;display:grid}.faq-grid details{background:#fff;border:1px solid #e1eaf0;border-radius:8px;padding:14px 15px}.faq-grid summary{color:#41566b;cursor:pointer;padding-right:20px;font-size:11px;font-weight:600;list-style:none;position:relative}.faq-grid summary::-webkit-details-marker{display:none}.faq-grid summary:after{content:"+";color:#238eb5;font-size:15px;position:absolute;right:0}.faq-grid details[open] summary:after{content:"−"}.faq-grid details p{color:#7b8b99;margin:10px 0 0;font-size:10px;line-height:1.6}.site-footer{color:#d7e5ed;background:#23374d}.footer-main{border-bottom:1px solid #ffffff1c;align-items:center;gap:25px;min-height:105px;display:flex}.footer-brand{background:#fff;border-radius:6px;padding:5px 7px}.footer-main>p{color:#a8bac7;margin:0;font-size:10px}.footer-main nav{gap:19px;margin-left:auto;display:flex}.footer-main nav a,.footer-bottom{color:#a9bdca;font-size:9px}.footer-main nav a:hover,.footer-home:hover{color:#fff}.footer-bottom{justify-content:space-between;align-items:center;gap:15px;min-height:48px;display:flex}.footer-bottom b{color:#ff9b5e}.footer-home{color:#4b96b1;font-weight:600}.breadcrumbs{color:#92a0ab;flex-wrap:wrap;align-items:center;gap:9px;margin:24px 0;font-size:10px;display:flex}.breadcrumbs a{color:#418da9}.tool-page{min-height:68vh;padding-bottom:70px}.tool-page-grid{grid-template-columns:minmax(0,1fr) 280px;align-items:start;gap:20px;display:grid}.tool-page-panel{padding:25px}.tool-page-panel .panel-heading h1{font-size:24px}.tool-page-panel .panel-description{max-width:680px;margin-block:16px 20px;font-size:13px}.tool-page-panel .calc-fields{grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.tool-page-panel .field{font-size:11px}.tool-page-panel .field input,.tool-page-panel .field select{height:44px;font-size:13px}.tool-page-panel .form-actions{margin-top:18px}.tool-page-panel .button{min-height:43px;font-size:12px}.tool-page-panel .formula-note{margin-top:22px}.tool-explainer{color:#6d7d8b;max-width:800px;padding:44px 15px 0;font-size:13px;line-height:1.8}.tool-explainer h2{color:#304258;font-size:21px}.tool-explainer h3{color:#40556a;margin-top:26px;font-size:15px}.category-page{min-height:70vh;padding-bottom:65px}.category-page h1,.simple-page h1{color:#25364c;letter-spacing:-1.4px;margin:0 0 12px;font-size:clamp(30px,5vw,44px)}.category-lede{color:#728292;max-width:650px;margin-bottom:28px;font-size:13px;line-height:1.7}.category-tools{margin-bottom:24px}.category-tools .tool-card{min-height:175px}.category-tools h2{color:#304256;margin:0 0 7px;font-size:13px}.simple-page{color:#6f7f8d;max-width:820px;min-height:72vh;padding-block:40px 80px;font-size:14px;line-height:1.8}.simple-page>.footer-home{margin-bottom:45px;display:inline-block}.simple-page h2{color:#34495f;margin-top:30px;font-size:19px}.simple-page p{max-width:720px}.simple-page ul{padding-left:22px}@media (width<=980px){.category-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.site-header{gap:14px}.brand-logo{width:190px}.header-tools{gap:4px}.header-icon-button{flex-basis:30px;width:30px;height:30px}.site-search{width:min(360px,40vw)}.workspace-grid{grid-template-columns:1fr}.calculator-notebook{grid-template-columns:minmax(250px,.9fr) minmax(270px,1.1fr)}.ad-side{grid-column:1/-1;min-height:100px}.ad-side .ad-content{align-items:center;gap:12px;display:flex}.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.about-section{grid-template-columns:110px 1.1fr 1fr;gap:25px}.about-mark{width:108px;height:108px}.about-mark-ring{width:68px;height:68px;font-size:34px}}@media (width<=680px){.wrap{width:min(100% - 30px,560px)}.site-header{grid-template-columns:1fr auto;align-items:center;gap:10px;min-height:0;padding-block:10px;display:grid}.brand{gap:8px}.brand-logo{width:min(205px,54vw);max-height:47px}.header-right{display:contents}.header-tools{grid-area:2/1/auto/-1;justify-content:space-between;gap:3px;width:100%}.header-date{margin-right:0;padding:4px 5px;font-size:8px;display:flex}.header-date svg{width:13px;height:13px}.header-icon-button{flex-basis:29px;width:29px;height:29px}.language-control summary{min-width:64px}.language-label{font-size:8px}.header-search-row{grid-area:3/1/auto/-1;width:100%}.site-search{flex:1;width:auto;min-width:0;height:38px}.header-popover{position:fixed;top:120px;right:15px}.header-menu{top:calc(100% + 6px);right:0}.quick-access{padding-block:11px 13px}.quick-rail{gap:7px}.quick-item{min-width:128px;padding:8px;font-size:10px}.quick-icon{width:25px;height:25px}.hero{grid-template-columns:1fr;gap:4px;min-height:0;padding-block:29px 25px}.hero-copy{padding:0}.hero h1{letter-spacing:-2.8px;font-size:clamp(42px,12vw,58px)}.hero-description{max-width:460px;margin-block:13px 19px;font-size:12px}.hero-stats{gap:15px}.hero-stats strong{font-size:17px}.hero-stats span{font-size:9px}.hero-visual{width:100%;height:190px}.orbit{width:190px;height:190px}.orbit-two{width:155px;height:155px}.visual-card-main{width:215px;padding:13px 15px 11px}.visual-card-main>strong{margin:7px 0;font-size:27px}.visual-bars{height:35px}.visual-card-float{bottom:3px;right:2%}.star-one{top:5px;left:10%}.band-inner{min-height:44px}.band-inner h2{font-size:13px}.band-inner>span{text-align:right;max-width:150px;font-size:9px}.workspace-section{padding-block:14px 35px}.workspace-grid,.calculator-notebook{grid-template-columns:1fr;gap:10px}.calculator-panel,.notes-panel{padding:15px}.panel-heading h2{font-size:15px}.heading-icon{flex-basis:35px;width:35px;height:35px}.heading-link{display:none}.fullscreen-button{margin-left:auto}.panel-description{font-size:10px}.calc-fields{gap:11px 8px}.field{font-size:9px}.field input,.field select{height:38px;padding-inline:8px;font-size:11px}.result-box strong{font-size:20px}.basic-calculator{width:min(100%,350px);padding:12px}.basic-calculator[data-mode=scientific]{padding:10px}.science-keypad{gap:4px}.key-science{min-height:31px;font-size:10px}.calculator-screen{min-height:69px}.calculator-keypad{grid-template-rows:repeat(5,minmax(48px,auto));gap:8px}.key{min-height:48px;font-size:20px}.basic-calculator[data-mode=scientific] .calculator-keypad{grid-template-rows:repeat(5,minmax(38px,auto));gap:4px}.notes-panel{min-height:290px}.notebook-paper{min-height:195px}.ad-side{order:3;grid-column:auto;min-height:82px}.ad-side .ad-label{top:7px}.ad-side .ad-content b{font-size:11px}.ad-content small{max-width:none}.popular-section{padding-block:4px 36px}.section-heading{align-items:flex-start;margin-bottom:13px}.section-heading h2{font-size:21px}.section-heading>.text-link{margin-top:19px;font-size:9px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.tool-card{min-height:157px;padding:11px}.tool-card h3{font-size:11px}.tool-card p{font-size:9px}.category-section{padding-block:28px 32px}.category-heading{display:block}.category-heading>span{margin-top:8px;font-size:10px;display:block}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.category-card{gap:7px;min-height:102px;padding:12px 8px}.category-label strong{font-size:10px}.category-label small{font-size:8px}.about-section{grid-template-columns:72px 1fr;gap:17px;padding-block:43px}.about-mark{align-self:start;width:68px;height:68px;margin-top:10px}.about-mark-ring{border-radius:14px 14px 14px 4px;width:44px;height:44px;font-size:24px}.about-mark-star{font-size:16px;top:0;right:-3px}.about-copy h2{font-size:21px}.about-copy>p:not(.eyebrow){font-size:10px}.about-points{grid-column:1/-1;grid-template-columns:1fr 1fr;gap:11px}.about-points>div{border:0;padding:0}.about-points>div:last-child{grid-column:1/-1}.about-story{font-size:11px;line-height:1.75}.about-story h3{font-size:16px}.ad-banner{min-height:80px;margin-bottom:38px;font-size:9px}.faq-section{padding-bottom:43px}.faq-grid{grid-template-columns:1fr}.footer-main{grid-template-columns:1fr;gap:13px;min-height:0;padding-block:22px;display:grid}.footer-main nav{flex-wrap:wrap;gap:14px;margin-left:0}.footer-bottom{flex-wrap:wrap;justify-content:flex-start;gap:6px 16px;min-height:58px;padding-block:10px;font-size:8px}.footer-bottom>:last-child{margin-left:auto}.breadcrumbs{margin:16px 0}.tool-page{padding-bottom:45px}.tool-page-grid{grid-template-columns:1fr;gap:12px}.tool-page-panel{padding:15px}.tool-page-panel .panel-heading h1{font-size:18px}.tool-page-panel .panel-description{font-size:11px}.tool-page-panel .calc-fields{gap:11px 8px}.tool-page-panel .field input,.tool-page-panel .field select{height:39px;font-size:11px}.tool-explainer{padding:30px 2px 0;font-size:11px}.tool-explainer h2{font-size:18px}.tool-page-grid .ad-side{min-height:75px}.category-page{padding-bottom:45px}.category-page h1,.simple-page h1{font-size:33px}.category-lede{font-size:11px}.category-tools{grid-template-columns:repeat(2,minmax(0,1fr))}.category-tools .tool-card{min-height:165px}.simple-page{padding-block:24px 55px;font-size:12px}.simple-page>.footer-home{margin-bottom:35px}.calculator-notebook:fullscreen,.calculator-notebook.is-fullscreen{grid-template-columns:1fr;align-content:start;gap:10px;height:100vh;padding:10px}.calculator-notebook:fullscreen .calculator-panel,.calculator-notebook:fullscreen .notes-panel,.calculator-notebook.is-fullscreen .calculator-panel,.calculator-notebook.is-fullscreen .notes-panel{height:auto}.calculator-notebook:fullscreen .notes-panel,.calculator-notebook.is-fullscreen .notes-panel{min-height:250px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}