/* Original interface. System fonts only: no external font files or requests. */
:root{color-scheme:light;--bg:#f5f7fb;--paper:#fff;--ink:#17243c;--muted:#657189;--line:#e4e8f1;--accent:#5551df;--accent-strong:#423cc1;--accent-soft:#efedff;--teal:#14675c;--teal-soft:#e9f5ef;--sidebar:#14243d;--shadow:0 6px 26px #15233a06;--warn-bg:#fff5dd;--warn:#795514;--error-bg:#fff0ef;--error:#a53639;--radius:18px;--chart-grid:#dce2ed;--bar:#6d68e8;--bar2:#b3acef;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:15px;line-height:1.55}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);color:var(--ink)}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.16;letter-spacing:-.035em}h1{font-size:clamp(32px,3.2vw,46px);font-weight:720}h2{font-size:24px;font-weight:690}h3{font-size:18px;font-weight:650}p{color:var(--muted)}[hidden]{display:none!important}:focus-visible{outline:3px solid #8a73ff;outline-offset:4px}::selection{background:#ded6ff;color:#19243b}.skip-link{position:fixed;top:-90px;left:20px;background:var(--ink);color:white;padding:12px;z-index:100}.skip-link:focus{top:12px}.site-header{height:82px;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:42px;padding:0 4vw;position:relative;z-index:10}.brand{display:flex;align-items:center;gap:10px;font-size:23px;font-weight:760;letter-spacing:-.9px;white-space:nowrap}.brand-mark{width:36px;height:36px;border-radius:11px;background:var(--accent);color:white;font-size:29px;font-family:Georgia,serif;line-height:30px;text-align:center}.brand-mark span{color:#bcf0c5}.brand-beta{font-size:10px;letter-spacing:.03em;font-weight:550;color:var(--muted);background:var(--bg);padding:3px 6px;border-radius:4px;margin-left:0}.header-links{display:flex;gap:29px;font-size:13px;font-weight:600;margin-left:auto}.header-links a:hover,.text-link:hover{color:var(--accent)}.header-actions{display:flex;align-items:center;gap:16px}.lang-switch{font-size:12px;font-weight:700;display:flex;gap:9px}.lang-switch span{color:var(--muted)}.theme-toggle{background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:10px;width:36px;height:36px;font-size:22px;line-height:1}.page-main{max-width:1220px;margin:auto;padding:0 34px}.eyebrow{font-size:10px;letter-spacing:.13em;font-weight:750;color:var(--muted);margin-bottom:17px;display:flex;align-items:center;gap:8px}.dot,.demo-dot{width:7px;height:7px;display:inline-block;border-radius:50%;background:var(--teal)}.hero{display:grid;grid-template-columns:1.25fr 1fr;gap:70px;align-items:center;padding:76px 0 66px}.hero h1{font-size:clamp(42px,4.7vw,66px);letter-spacing:-.055em;line-height:1.08;margin-bottom:22px}.hero h1 em{font-style:normal;color:var(--accent)}.hero-intro{max-width:460px;font-size:17px;line-height:1.8;margin-bottom:28px}.hero-actions{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.button{display:inline-flex;gap:15px;align-items:center;justify-content:center;border:1px solid transparent;border-radius:10px;padding:13px 19px;font-size:13px;font-weight:670;line-height:1.4;transition:background .15s,transform .15s;color:var(--ink);white-space:nowrap}.button.primary{background:var(--accent);color:#fff;box-shadow:0 3px 8px #514adf17}.button.primary:hover{background:var(--accent-strong)}.button.secondary{background:var(--paper);border-color:var(--line)}.button.secondary:hover:not(:disabled){background:var(--bg);border-color:#c4c9d9}.button.small{font-size:11px;padding:9px 12px}.text-link,.text-button{font-size:12px;color:var(--accent);font-weight:650}.text-button{border:0;padding:0;background:none;text-align:left}.hero-trust{display:flex;flex-wrap:wrap;gap:20px;margin-top:24px;font-size:11px;color:var(--muted)}.hero-trust span::first-letter{color:var(--teal)}.hero-demo{background:var(--paper);border:1px solid var(--line);border-radius:22px;box-shadow:0 25px 70px #2035520c;transform:rotate(1deg);padding:24px 28px 0;position:relative;overflow:hidden}.demo-top{display:flex;align-items:center;gap:7px;letter-spacing:.08em;font-size:9px;font-weight:750;color:var(--muted)}.demo-code{margin-left:auto;color:#a1a9b8}.demo-input{border:1px solid var(--line);border-radius:10px;background:var(--bg);padding:14px 17px;font-family:ui-monospace,monospace;font-size:16px;letter-spacing:.06em;margin:23px 0}.demo-result{display:flex;flex-direction:column}.demo-result>span:first-child{font-size:11px;color:var(--muted)}.demo-result strong{font-size:48px;letter-spacing:-.04em;line-height:1.35;font-weight:710}.demo-formula{font-family:ui-monospace,monospace;font-size:11px;color:var(--muted)}.mini-bars{display:flex;align-items:flex-end;gap:7px;margin:14px 0 0;height:103px;border-bottom:1px solid var(--line);padding:0 8px;overflow:hidden}.mini-bars i{flex:1;height:calc(var(--bar)*.62);background:#d0ccfa;border-radius:4px 4px 0 0}.mini-bars i:nth-child(5),.mini-bars i:nth-child(6),.mini-bars i:nth-child(7){background:#716be4}.illustration-label{font-size:8px;margin:7px 0 10px;color:var(--muted)}.demo-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:15px 0;font-size:10px;color:var(--muted)}.demo-bottom b{display:inline-block;color:var(--ink);margin-left:8px;font-size:15px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:25px}.section-heading h2{font-size:32px;margin:0}.section-heading .eyebrow{margin-bottom:10px}.section-heading>p{font-size:12px;line-height:1.7;margin-bottom:3px}.tools-section{padding:18px 0 42px;scroll-margin-top:30px}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tool-card{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:15px;padding:23px 24px;transition:transform .15s,border-color .15s,box-shadow .15s}.tool-card:hover{transform:translateY(-4px);border-color:#c3bff4;box-shadow:0 12px 24px #25385109}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:23px}.tool-symbol{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;color:var(--accent);background:var(--accent-soft);font-family:Georgia,serif;font-size:25px}.symbol-1,.symbol-4{color:var(--teal);background:var(--teal-soft)}.symbol-2,.symbol-5{color:#915729;background:#faf0e2}.card-category{font-size:10px;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:3px 9px}.tool-card h3{font-size:19px;margin-bottom:11px}.tool-card>p{font-size:12px;line-height:1.7;min-height:40px;margin-bottom:23px}.card-link{margin-top:auto;display:flex;justify-content:space-between;align-items:center;color:var(--accent);font-size:11px;font-weight:650}.card-link span{font-size:18px}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:50px;padding:42px 0 65px;border-top:1px solid var(--line)}.principles p{font-size:12px;line-height:1.8;margin:0}.principles h3{font-size:17px;margin:14px 0 10px}.step-number{font-family:ui-monospace,monospace;color:var(--teal);font-size:12px;font-weight:bold}.site-footer{border-top:1px solid var(--line);background:var(--paper);padding:27px 4vw 22px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px}.site-footer>div{display:flex;align-items:center;gap:20px}.site-footer strong{font-size:17px;letter-spacing:-.03em}.site-footer span,.site-footer a{font-size:10px;color:var(--muted)}.site-footer nav{display:flex;gap:24px}.site-footer>p{font-size:9px;width:100%;margin:0}.workspace{display:grid;grid-template-columns:225px minmax(0,1fr);max-width:1740px;margin:auto;min-height:calc(100vh - 82px)}.sidebar{background:var(--sidebar);color:#dde5f4;padding:31px 17px;position:relative}.backlink{display:block;font-size:11px;color:#c2cce0;padding:0 9px;margin-bottom:32px}.sidebar>.eyebrow{font-size:8px;color:#93a4bd;padding:0 9px;line-height:1.7;letter-spacing:.1em}.tool-nav{display:flex;flex-direction:column;gap:7px}.tool-nav a{display:flex;align-items:center;gap:10px;font-size:11px;padding:12px 9px;border-radius:9px;font-weight:530;line-height:1.4}.tool-nav a[aria-current=page]{background:#32415c;color:#fff;box-shadow:inset 3px 0 #afa6ff}.tool-nav a:hover{background:#293b56}.nav-symbol{font-family:Georgia,serif;font-size:20px;width:23px;flex-shrink:0;color:#ada6ee;text-align:center}.side-note{background:#1c2e48;border:1px solid #31425c;border-radius:12px;padding:17px 13px;margin-top:46px}.side-note strong{font-size:11px}.side-note p{color:#a8b7cd;font-size:10px;line-height:1.8;margin:11px 0 15px}.side-note a{font-size:10px;color:#c8c1ff}.side-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#94dcb8;margin-right:7px}.tool-main{padding:27px 35px 50px;min-width:0;max-width:1380px;width:100%;margin:auto}.breadcrumb{display:flex;gap:10px;align-items:center;font-size:10px;color:var(--muted);margin-bottom:26px;flex-wrap:wrap}.breadcrumb>a{color:var(--accent)}.tool-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:22px}.tool-heading h1{font-size:clamp(29px,2.8vw,41px);margin:0 0 11px}.tool-heading p:not(.eyebrow){margin-bottom:0;font-size:12px}.tool-heading .eyebrow{font-size:9px;margin-bottom:10px}.eyebrow-separator{opacity:.35;padding:0 3px}.heading-symbol{font-family:Georgia,serif;font-size:48px;background:var(--accent-soft);color:var(--accent);width:76px;height:76px;display:grid;place-items:center;border-radius:20px;flex-shrink:0}.local-notice{display:flex;align-items:center;gap:11px;background:var(--teal-soft);padding:11px 15px;border:1px solid #d9ebe2;border-radius:10px;margin-bottom:22px;color:var(--teal)}.local-notice>span{font-size:20px;line-height:1}.local-notice p{font-size:10px;color:var(--teal);margin:0}.local-notice a{margin-left:auto;font-size:10px;white-space:nowrap}.calculator-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.06fr);gap:20px;align-items:start}.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:23px;box-shadow:var(--shadow);min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}.panel-heading h2{font-size:17px;letter-spacing:-.025em;display:flex;align-items:center;margin:0;gap:9px}.section-number{font-size:10px;color:#8b8ca4;font-family:ui-monospace,monospace;font-weight:550;letter-spacing:0}.badge{font-size:9px;background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:3px 8px;color:var(--muted);white-space:nowrap}fieldset{border:0;padding:0;margin:0 0 20px}legend,label{font-size:11px;font-weight:620;color:var(--ink)}legend{margin-bottom:9px}.segmented{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:4px;display:grid;grid-template-columns:1fr 1fr;gap:4px}.segmented label{cursor:pointer;position:relative}.segmented input{position:absolute;opacity:0;width:1px;height:1px}.segmented label>span{display:flex;align-items:center;justify-content:center;gap:7px;border-radius:7px;padding:9px 5px;font-size:11px;color:var(--muted);font-weight:600}.segmented small{font-size:10px;font-weight:450;opacity:.7}.segmented input:checked+span{background:var(--paper);color:var(--accent);box-shadow:0 1px 4px #14203910}.segmented input:focus-visible+span{outline:3px solid #8a73ff}.field{margin-bottom:16px;min-width:0}.field>label{display:block;margin-bottom:7px}.label-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:9px}.label-row .text-button{font-size:10px}textarea,input:not([type=radio]):not([type=checkbox]):not([type=file]),select{border:1px solid #dce1eb;background:var(--paper);color:var(--ink);border-radius:8px;padding:10px 11px;max-width:100%;transition:border-color .15s}textarea{width:100%;resize:vertical;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.85;min-height:158px;max-height:450px;background:var(--bg);display:block}textarea:focus,select:focus,input:focus{border-color:var(--accent)}input:not([type=checkbox]):not([type=radio]):not([type=file]),select{width:100%;font-size:11px;min-height:38px}input[type=file]{width:100%;font-size:10px;margin:9px 0 14px;color:var(--muted)}input[type=file]::file-selector-button{border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--ink);padding:7px;margin-right:6px;cursor:pointer}.field-hint{font-size:9px;line-height:1.7;color:var(--muted);margin:7px 0 0}.field-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}.data-preview{font-size:10px;margin:0 0 12px;color:var(--teal);min-height:15px}.form-actions{display:flex;gap:10px}.form-actions .primary{flex:1;font-size:12px;justify-content:space-between}.icon-clear{font-size:19px!important;padding:6px 13px!important}.input-limits{font-size:8px;text-align:center;color:var(--muted);margin-top:16px}.error,.warning{font-size:11px;line-height:1.65;border-radius:8px;padding:12px;margin:12px 0;overflow-wrap:anywhere}.error{color:var(--error);background:var(--error-bg);border:1px solid #ecc2c4}.warning{color:var(--warn);background:var(--warn-bg);border:1px solid #eed59c}.csv-import{margin-top:22px;padding-top:17px;border-top:1px solid var(--line)}summary{cursor:pointer;font-size:11px;font-weight:630;line-height:1.5}.csv-content{padding-top:12px}.file-label{display:block;margin-top:10px}.check-field{display:flex;align-items:center;gap:8px;font-size:10px;margin-bottom:12px}.check-field input{accent-color:var(--accent)}.csv-content .button{width:100%;font-size:11px;margin-top:12px}.example-file{display:block;font-size:10px;color:var(--accent);margin-top:12px;text-align:center}.precision-label{display:flex;align-items:center;gap:7px;font-size:9px;font-weight:500;color:var(--muted)}.precision-label select{font-size:10px;width:52px;min-height:30px;padding:5px}.result-status{font-size:9px;color:var(--teal);margin:-3px 0 14px;min-height:15px}.result-status.stale{background:var(--warn-bg);color:var(--warn);padding:8px;border-radius:6px}.results-body.stale{opacity:.48}.primary-result{padding:19px 19px 17px;border:1px solid #dfdcff;background:var(--accent-soft);border-radius:13px;position:relative;overflow:hidden}.primary-label{font-size:11px;font-weight:570;color:var(--accent-strong);display:block}.primary-number{display:block;font-size:clamp(30px,3.3vw,47px);letter-spacing:-.045em;line-height:1.5;font-weight:730;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.primary-number.is-undefined{font-size:28px}.primary-hint{font-size:9px;color:var(--muted);line-height:1.7;margin:0}.result-metrics{display:grid;grid-template-columns:1fr 1fr;margin:18px 0 0;gap:0 20px}.result-metrics>div{padding:12px 0;border-bottom:1px solid var(--line);min-width:0}.result-metrics dt{font-size:10px;color:var(--muted);line-height:1.4}.result-metrics dd{font-size:18px;font-weight:620;letter-spacing:-.02em;margin:4px 0 0;line-height:1.5;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.result-metrics dd.small-value{font-size:13px}.result-note{font-size:9px;line-height:1.8;margin:15px 0 0}.result-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:19px;padding-top:17px;border-top:1px solid var(--line)}.empty-state{padding:50px 20px;text-align:center;font-size:12px;color:var(--muted)}.chart-panel{margin-top:22px;padding-bottom:20px}.chart-panel .eyebrow{font-size:8px;margin-bottom:7px}.chart-panel h2{font-size:20px}.chart-caption{font-size:10px;color:var(--muted);margin:0 0 5px}.histogram-svg,.boxplot-svg{width:100%;height:auto;display:block;overflow:visible}.svg-label{font:11px ui-sans-serif,system-ui,sans-serif;fill:var(--muted)}.svg-count{font:10px ui-sans-serif,system-ui,sans-serif;fill:var(--ink)}.svg-grid{stroke:var(--chart-grid);stroke-dasharray:3 5;stroke-width:1}.svg-bar{fill:var(--bar)}.svg-bar:hover{fill:var(--accent-strong)}.chart-data{margin-top:4px}.chart-data summary{font-size:10px;font-weight:500;color:var(--muted)}#boxplot{border-top:1px solid var(--line);margin-top:16px;padding-top:17px}#boxplot h3{font-size:14px;margin:0 0 5px}#boxplot p{font-size:9px;margin-bottom:0}.calculations-panel{margin-top:22px}.calculations-panel>details>summary{font-size:14px}.calculations-panel>details+details{border-top:1px solid var(--line);margin-top:20px;padding-top:18px}.step-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin-top:20px}.calculation-step{border:1px solid var(--line);border-radius:10px;padding:15px;min-width:0}.calculation-step>span{font-size:9px;color:var(--muted)}.calculation-step h3{font-size:12px;margin:6px 0 10px}.calculation-step p{font-size:11px;margin:0;font-family:ui-monospace,monospace;overflow-wrap:anywhere;color:var(--ink);line-height:1.8}.table-wrap{max-width:100%;overflow:auto;margin-top:12px}table{width:100%;border-collapse:collapse;font-size:10px;text-align:left;font-variant-numeric:tabular-nums}th{background:var(--bg);font-weight:650}th,td{padding:9px 10px;border-bottom:1px solid var(--line);white-space:nowrap}caption{text-align:left;font-size:10px;color:var(--muted);padding-bottom:9px}#csv-preview table{font-size:9px}#csv-preview td{max-width:150px;overflow:hidden;text-overflow:ellipsis}.method-article{margin-top:47px}.method-article .section-heading h2{font-size:25px}.formula-block{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px;font-family:ui-monospace,monospace;font-size:13px;color:var(--accent);margin-bottom:25px;overflow-wrap:anywhere}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px}.article-grid h3{font-size:15px;margin-bottom:12px}.article-grid p{font-size:11px;line-height:1.95;margin:0}.related-tools{margin-top:39px;padding-top:25px;border-top:1px solid var(--line)}.related-tools h2{font-size:18px;margin-bottom:18px}.related-tools>div{display:flex;gap:13px;flex-wrap:wrap}.related-tools a{font-size:11px;background:var(--paper);padding:12px 15px;border:1px solid var(--line);border-radius:10px}.related-tools a>span{font-family:Georgia,serif;color:var(--accent);font-size:18px;margin-right:10px}.prose-page{max-width:820px;margin:70px auto 85px}.prose-page h1{font-size:44px;line-height:1.2}.prose-page .lead{font-size:20px;line-height:1.6}.prose-page h2{font-size:23px;margin-top:32px}.prose-page p,.prose-page li{font-size:14px;line-height:1.9}.prose-page li{margin-bottom:8px;color:var(--muted)}.prose-page a:not(.button){color:var(--accent);text-decoration:underline}.toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,15px);padding:12px 20px;background:#182a43;color:white;border:1px solid #4a5a71;border-radius:10px;font-size:12px;z-index:100;opacity:0;pointer-events:none;transition:.2s;max-width:90vw}.toast.visible{opacity:1;transform:translate(-50%,0)}
[data-theme=dark]{color-scheme:dark;--bg:#101a2a;--paper:#19263a;--ink:#edf0f8;--muted:#a8b4c9;--line:#2d3b53;--accent:#aaa0ff;--accent-strong:#bcb3ff;--accent-soft:#302e50;--teal:#94d7bb;--teal-soft:#1c3738;--sidebar:#0b1423;--warn-bg:#392f22;--warn:#efd08b;--error-bg:#422931;--error:#ffb6b9;--chart-grid:#3c4c67;--bar:#a49cf2;--bar2:#504967}[data-theme=dark] .button.primary{background:#6357d7;color:white}[data-theme=dark] .button.primary:hover{background:#7568e8}[data-theme=dark] .brand-mark{background:#6357d7}[data-theme=dark] textarea,[data-theme=dark] input:not([type=radio]):not([type=checkbox]),[data-theme=dark] select{border-color:var(--line)}[data-theme=dark] .primary-result{border-color:#484569}[data-theme=dark] .local-notice{border-color:#284a48}[data-theme=dark] .symbol-2,[data-theme=dark] .symbol-5{color:#efc49b;background:#3a2f2c}[data-theme=dark] .mini-bars i{background:#60567f}[data-theme=dark] .mini-bars i:nth-child(5),[data-theme=dark] .mini-bars i:nth-child(6),[data-theme=dark] .mini-bars i:nth-child(7){background:#aaa0ff}
@media(min-width:1500px){.tool-main{padding:32px 50px 60px}.calculator-grid{gap:25px}.panel{padding:27px}.tool-heading h1{font-size:44px}.result-metrics dd{font-size:23px}.primary-number{font-size:55px}}
@media(max-width:1150px){.workspace{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding-left:12px;padding-right:12px}.tool-nav a{font-size:10px}.tool-main{padding:24px}.panel{padding:18px}.hero{gap:40px;padding-top:58px}.hero h1{font-size:52px}.hero-demo{padding:20px}.hero-actions{gap:17px}.header-links{gap:20px}.article-grid{gap:20px}.primary-number{font-size:35px}.result-metrics dd{font-size:16px}}
@media(max-width:940px){.workspace{display:block}.sidebar{padding:12px 20px}.sidebar>.eyebrow,.backlink,.side-note{display:none}.tool-nav{flex-direction:row;overflow:auto;gap:7px;padding-bottom:3px}.tool-nav a{flex-shrink:0;font-size:10px;gap:8px;padding:8px 12px}.nav-symbol{font-size:17px;width:20px}.tool-nav a[aria-current=page]{box-shadow:inset 0 -2px #afa6ff}.tool-main{max-width:920px;padding:24px}.header-links{margin-left:auto}.site-header{gap:25px;padding:0 24px;height:72px}.hero{gap:25px}.hero h1{font-size:44px}.hero-intro{font-size:15px}.hero-demo{transform:none}.hero-trust{gap:13px;font-size:10px}.tool-card{padding:20px}.tool-card h3{font-size:17px}.demo-result strong{font-size:41px}.tool-grid{gap:14px}.page-main{padding:0 24px}}
@media(max-width:680px){html{font-size:14px}.site-header{padding:0 17px;gap:12px;height:66px}.brand{font-size:21px;gap:8px}.brand-mark{width:31px;height:31px;font-size:25px;line-height:27px}.brand-beta{font-size:8px}.header-links{display:none}.header-actions{margin-left:auto;gap:13px}.lang-switch{font-size:11px}.theme-toggle{width:32px;height:32px}.page-main{padding:0 20px}.hero{grid-template-columns:1fr;padding:43px 0 38px;gap:35px}.hero h1{font-size:49px;line-height:1.08;max-width:460px}.hero .eyebrow{font-size:8px;letter-spacing:.11em}.hero-intro{font-size:15px;max-width:400px}.hero-demo{padding:22px 24px 0;max-width:450px;width:100%;margin:auto}.demo-result strong{font-size:44px}.mini-bars{height:83px}.mini-bars i{height:calc(var(--bar)*.5)}.hero-actions .button{font-size:12px}.section-heading{align-items:start}.section-heading h2{font-size:28px}.section-heading>p{display:none}.tool-grid{grid-template-columns:1fr 1fr;gap:12px}.tool-card{padding:17px}.card-top{margin-bottom:18px}.card-category{font-size:8px;padding:2px 6px}.tool-symbol{width:36px;height:36px;font-size:23px;border-radius:9px}.tool-card h3{font-size:17px;min-height:40px;line-height:1.3}.tool-card>p{font-size:11px;min-height:58px}.card-link{font-size:10px;gap:8px}.principles{grid-template-columns:1fr;gap:27px;padding:28px 0 38px}.principles h3{margin:6px 0 7px}.principles p{max-width:450px}.site-footer{padding:25px 20px;gap:18px}.site-footer>div{flex-wrap:wrap;gap:10px}.site-footer nav{gap:20px}.tool-main{padding:20px 16px 35px}.sidebar{padding:10px 13px}.breadcrumb{margin-bottom:23px;font-size:9px;gap:7px}.tool-heading h1{font-size:30px;line-height:1.14}.tool-heading p:not(.eyebrow){font-size:11px}.heading-symbol{width:52px;height:57px;font-size:34px;border-radius:13px}.tool-heading{gap:15px}.tool-heading .eyebrow{font-size:8px;letter-spacing:.08em}.local-notice{padding:11px;align-items:start}.local-notice>span{font-size:18px}.local-notice p{font-size:10px;line-height:1.6}.local-notice a{display:none}.calculator-grid{grid-template-columns:1fr;gap:16px}.panel{padding:20px;border-radius:14px}.primary-number{font-size:44px}.result-metrics dd{font-size:22px}.panel-heading h2{font-size:17px}.precision-label{font-size:10px}.result-actions .button{font-size:11px}.chart-panel{padding:17px}.chart-panel h2{font-size:18px}.chart-panel .eyebrow{font-size:7px}.chart-panel .panel-heading{gap:8px}.chart-panel .button{font-size:10px}.step-grid{grid-template-columns:1fr 1fr;gap:10px}.calculation-step{padding:12px}.calculation-step p{font-size:10px}.article-grid{grid-template-columns:1fr;gap:24px}.article-grid h3{font-size:17px}.article-grid p{font-size:12px}.method-article .section-heading{display:block}.method-article .section-heading a{display:inline-block;margin-top:15px}.formula-block{font-size:11px;padding:15px;line-height:1.9}.method-article{margin-top:34px}.related-tools>div{gap:9px}.related-tools a{font-size:10px;padding:9px 12px}.prose-page{margin:40px auto 55px}.prose-page h1{font-size:34px}.prose-page .lead{font-size:18px}.prose-page p,.prose-page li{font-size:13px}.hero-trust{gap:17px}.svg-label{font-size:12px}}
@media(max-width:370px){.tool-grid{grid-template-columns:1fr}.hero h1{font-size:42px}.hero-trust{gap:10px}.tool-card h3,.tool-card>p{min-height:0}.brand-beta{display:none}.step-grid{grid-template-columns:1fr}.field-pair{gap:8px}.primary-number{font-size:38px}.button.small{padding:8px}.site-footer nav{gap:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.tool-card:hover{transform:none}}
@media print{body{background:#fff;color:#000}.site-header,.sidebar,.site-footer,.input-panel,.result-actions,.breadcrumb,.local-notice,.related-tools,.method-article,.theme-toggle,.skip-link,.toast,.chart-data,#export-chart,#export-data,.precision-label{display:none!important}.workspace,.calculator-grid{display:block}.tool-main{padding:0;max-width:none}.panel{box-shadow:none;border:1px solid #ccc;break-inside:avoid;margin-bottom:15px}.results-panel{width:100%}.tool-heading{margin-top:0}.heading-symbol{display:none}.primary-result{background:#f4f4f4!important;color:#000}.result-metrics{grid-template-columns:repeat(4,1fr)}.result-metrics dd{font-size:16px}.result-status{color:#222}.chart-panel{margin-top:10px}.histogram-svg{max-height:220px}.boxplot-svg{max-height:125px}.calculations-panel details{display:block}.primary-hint,.primary-label,.result-note,.svg-label{color:#222;fill:#222}.svg-grid{stroke:#ccc}.svg-count{fill:#000}.svg-bar{fill:#777}}
/* v0.2: complete analysis workflow, with larger supporting text and touch targets. */
.analysis-meta,.session-panel,.export-panel{border-top:1px solid var(--line);padding-top:15px;margin-top:18px;font-size:12px}
.analysis-meta{margin:0 0 18px;border-top:0;padding-top:0}.analysis-meta .field-pair{margin-top:15px}.analysis-meta summary,.session-panel summary,.export-panel summary{font-weight:650;cursor:pointer;padding:6px 0}
.analysis-meta input{width:100%;min-width:0}.analysis-context{font-size:13px;font-weight:650;overflow-wrap:anywhere;margin-bottom:10px;color:var(--ink)}.analysis-context:empty{display:none}
.session-panel .field-hint,.export-panel .field-hint{margin-top:12px}.session-panel input[type=file]{max-width:100%;font-size:12px}.export-panel .field{margin-top:14px}.export-panel .result-actions{padding-top:4px}.csv-paste-field{margin:18px 0}.csv-paste-field textarea{width:100%;min-height:85px}.csv-paste-field .text-button{margin-top:8px}
.chart-options{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin:4px 0 12px;font-size:12px}.chart-options select{width:auto;min-height:40px}.chart-options .text-button{font-size:12px}.chart-scroll{max-width:100%;overflow-x:auto}.chart-scroll svg{display:block;min-width:600px;width:100%}
.data-table-toolbar,.table-pagination{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:12px}.data-table-toolbar{margin-top:12px}.data-table-toolbar select{width:auto;min-height:40px}.table-pagination{justify-content:space-between;margin-top:14px}.table-pagination span{font-variant-numeric:tabular-nums}.table-wrap:focus-visible{outline-offset:-3px}
.field-hint,.result-note,.input-limits{font-size:12px!important;line-height:1.6}.article-grid p{font-size:13px}.chart-data summary,#boxplot p,.chart-caption{font-size:12px}.result-metrics dt{font-size:12px}.button.small{min-height:40px}.text-button{min-height:36px}.theme-toggle{min-width:40px;min-height:40px}input,select{min-height:40px}.primary-number{overflow-wrap:anywhere}
@media(max-width:680px){.chart-options{gap:10px}.chart-options label{width:100%}.table-pagination .button{font-size:11px;padding:8px}.table-pagination{gap:8px}.analysis-meta .field-pair{grid-template-columns:1fr}.chart-scroll svg{min-width:580px}.form-actions .button{font-size:12px}.field-hint,.result-note{font-size:12px!important}}
@media print{.analysis-meta,.export-panel,.session-panel,.chart-options,#chart-bin-note,.table-pagination,.data-table-toolbar{display:none!important}.print-stale .results-panel,.print-stale .chart-panel,.print-stale .calculations-panel{display:none!important}.print-stale .tool-heading::after{content:attr(data-stale-label);display:block}.chart-scroll{overflow:visible}.chart-scroll svg{min-width:0}.analysis-context{display:block;color:#000}html[data-theme=dark]{--paper:#fff;--ink:#000;--muted:#333;--accent:#333;--accent-soft:#eee;--bg:#fff;--line:#ccc;--bar:#666;--chart-grid:#ccc;--warn-bg:#fff;--warn:#000}.table-wrap{overflow:visible}}

.mobile-chart-hint{display:none;font-size:12px}@media(max-width:680px){.mobile-chart-hint{display:block}}@media print{.mobile-chart-hint{display:none!important}}

/* v3: six-language selector. Native disclosure, keyboard-accessible real links. */
.language-menu{position:relative;z-index:50;font-size:.85rem}
.language-menu>summary{display:flex;align-items:center;gap:.5rem;cursor:pointer;list-style:none;padding:.55rem .7rem;border:1px solid var(--line);border-radius:9px;white-space:nowrap;color:var(--ink);background:var(--paper)}
.language-menu>summary::-webkit-details-marker{display:none}
.language-menu>summary:focus-visible,.lang-option:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.language-menu[open]>summary{border-color:var(--accent)}
.language-options{position:absolute;right:0;top:calc(100% + 8px);width:245px;max-width:calc(100vw - 24px);padding:6px;border:1px solid var(--line);background:var(--paper);border-radius:12px;box-shadow:0 12px 32px rgb(0 0 0 / .18)}
.language-options .lang-option{display:flex;justify-content:space-between;align-items:center;gap:14px;border-radius:7px;padding:11px 12px;text-decoration:none;color:var(--ink);font-size:.9rem;min-height:44px}
.language-options .lang-option:hover,.language-options .lang-option[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}
.header-actions{flex-shrink:0}.tool-heading h1{overflow-wrap:anywhere}.field>label{overflow-wrap:anywhere}
@media(max-width:640px){.language-label{display:none}.language-menu>summary{padding:.5rem .6rem;min-height:40px}.brand-beta{display:none}.site-header{gap:8px}.tool-heading h1{font-size:clamp(1.6rem,7vw,2.2rem)}}
@media print{.language-menu{display:none!important}}

/* v4: paired input, opt-in tab storage and descriptive column comparison. */
.workspace-controls{margin:0 0 22px;border:1px solid var(--line);border-radius:12px;background:var(--paper);font-size:13px;padding:12px 16px}
.workspace-controls>summary{font-weight:650;cursor:pointer;min-height:24px}.workspace-options{padding-top:12px}.workspace-options .check-field{align-items:flex-start;line-height:1.5}.workspace-options button{margin-top:6px}.workspace-options .field-hint{max-width:90ch}
.column-summary{border-top:1px solid var(--line);margin-top:18px;padding-top:12px}.column-summary>summary{cursor:pointer;font-weight:650}.column-checkboxes{max-height:190px;overflow:auto;padding:8px 0}.column-checkboxes label{padding:5px 0;overflow-wrap:anywhere}.column-summary fieldset{border:0;padding:0;margin:16px 0}.column-summary legend{font-size:12px}.column-summary #column-results{margin-top:16px;max-width:100%}
#secondary-input{min-height:140px}.prediction-result{padding:12px;background:var(--accent-soft);border-radius:8px;font-variant-numeric:tabular-nums}#residual-panel{margin-top:20px}.practical-guides h2{font-size:22px}.ad-placement{border:1px dashed var(--line);border-radius:10px;padding:20px;margin-top:24px;text-align:center;color:var(--muted);min-height:120px;font-size:12px}.ad-placement span{font-weight:650}
#chart svg{max-width:100%}.result-metrics dd{overflow-wrap:anywhere}.tool-main{min-width:0}.workspace-controls input[type=checkbox],.column-checkboxes input[type=checkbox]{min-height:20px;width:20px;flex-shrink:0}
@media(min-width:1000px){.sidebar{max-height:calc(100vh - 90px);overflow-y:auto}}
@media print{.workspace-controls,.column-summary,.ad-placement,#export-residuals,.prediction-result~button{display:none!important}}

/* v5 review, examples and confidence intervals reuse the existing design tokens. */
.example-library,.data-review{border:1px solid var(--line);border-radius:12px;padding:16px;margin:16px 0;background:var(--paper)}
.example-library>summary,.data-review>summary{font-weight:700;cursor:pointer;line-height:1.5}
.example-library .field,.data-review .field{margin-top:12px}.example-share{margin-top:16px}
.confidence-controls{padding:0 0 12px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.confidence-range{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px;padding:14px;background:var(--accent-soft);border-radius:10px;font-variant-numeric:tabular-nums}
.confidence-range strong{overflow-wrap:anywhere;min-width:0}.data-review .table-wrap{max-height:340px;overflow:auto}
#review-changes,#audit-status{overflow-wrap:anywhere;white-space:pre-wrap}#review-editor .result-actions{flex-wrap:wrap}
#review-issues td{white-space:normal;min-width:70px;max-width:260px;overflow-wrap:anywhere}
[hidden]{display:none!important}
@media print{.example-library,.data-review{display:none}#audit-status:empty{display:none}}
/* Allow long translated labels to wrap without stretching the page grid. */
.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.tool-card,.card-top,.result-metrics>div{min-width:0}
.tool-card h3,.tool-card p,.card-category,.result-metrics dt,.primary-hint,.primary-label,.tool-heading .eyebrow{overflow-wrap:anywhere}
.card-top{gap:8px}.tool-symbol{flex-shrink:0}.card-category{min-width:0;text-align:right}.result-metrics{min-width:0}
@media(max-width:680px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:370px){.tool-grid{grid-template-columns:minmax(0,1fr)}}

/* Operational typography and validation: shared across languages and both themes. */
@media screen {
  :root{--text-support:.9375rem;--text-control:1rem}
  .skip-link{background:var(--ink);color:var(--paper);border-radius:8px;max-width:calc(100vw - 40px);overflow-wrap:anywhere}
  .tool-main :is(label,legend,summary),.tool-nav a{font-size:var(--text-control);line-height:1.5;overflow-wrap:anywhere}
  .nav-symbol{width:30px;white-space:nowrap;overflow-wrap:normal}
  .tool-main :is(.field-hint,.result-note,.input-limits){font-size:var(--text-support)!important;line-height:1.65}
  .tool-main :is(.primary-hint,.primary-label,.result-metrics dt,.result-status,.data-preview,.chart-caption,.chart-data summary,#boxplot p,.calculation-step>span,.check-field,.precision-label,.example-file,.table-pagination,.data-table-toolbar),
  .local-notice :is(p,a),.breadcrumb,.backlink,.side-note :is(p,a),.site-footer :is(span,a,p),.tool-card>p,.card-link,.principles p{font-size:var(--text-support);line-height:1.65}
  .primary-hint{color:var(--ink)}
  .tool-heading p:not(.eyebrow),.article-grid p,.calculation-step :is(h3,p),.error,.warning{font-size:var(--text-control);line-height:1.65}
  .tool-main .button,.tool-main .text-button,.tool-main .label-row .text-button,.segmented label>span,.segmented small{font-size:var(--text-support);line-height:1.5;white-space:normal}
  .tool-main :is(textarea,select,input:not([type=checkbox]):not([type=radio]):not([type=file]):not([type=hidden])){font-size:max(16px,var(--text-control));line-height:1.5;min-height:44px}
  .tool-main input[type=file]{font-size:var(--text-support);line-height:1.5}
  .precision-label{flex-wrap:wrap;justify-content:flex-end}
  .tool-main .precision-label select{width:64px;min-height:40px}
  .panel-heading{flex-wrap:wrap}
  .panel-heading h2{min-width:0}
  .label-row{flex-wrap:wrap}
  .tool-heading>div,.article-grid>article,.practical-guides article{min-width:0}
  .breadcrumb>*{min-width:0;overflow-wrap:anywhere}
  .tool-main :is(p,button,a){overflow-wrap:anywhere;min-width:0}
  .form-actions,.site-footer nav{flex-wrap:wrap}
  .language-options .lang-option{overflow-wrap:anywhere}
  .language-options .lang-option>span{flex-shrink:0}
  .site-footer :is(p,a,span){overflow-wrap:anywhere;min-width:0}
  .input-limits{text-align:left}
  .input-limits p{margin:8px 0 0;color:inherit}
  .tool-main table,.tool-main caption,#csv-preview table{font-size:var(--text-support);line-height:1.5}
  .tool-main [aria-invalid=true]{border-color:var(--error);box-shadow:inset 3px 0 var(--error);scroll-margin-block:6rem}
  .tool-main [aria-invalid=true]:focus{outline:3px solid var(--error);outline-offset:3px}
}
@media screen and (max-width:680px){.site-header{flex-wrap:wrap;height:auto;min-height:66px;padding-block:12px}}