/* Locate marketing site, revision 7 (October 2, 2026).
   The app's own system at marketing scale, typeset the way xAI does it: white page, cream cards, Geist for copy,
   Geist Mono for labels, quiet weight-400 headlines that whisper rather than shout (a second, grey sentence carries
   the detail), hairlines instead of boxes, one black pill per view, a floating pill header on a page-coloured strip.
   No glows or gradients. Dark mirrors light. Product shots keep the app's own type because they are screenshots. */

@font-face{font-family:Geist;src:url(geist.woff2) format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:'Geist Mono';src:url(geist-mono.woff2) format('woff2');font-weight:100 900;font-style:normal;font-display:swap}

:root{
  color-scheme:light;
  --bg:#fff;--surface:#f9f8f6;--surface-2:#f1f0ed;--surface-3:#e7e5e1;--raised:#fff;
  --ink:#0a0a0a;--ink-2:#3b3b3b;--muted:#5f5f5f;--faint:#767676;
  --line:#ebe9e5;--line-strong:#dbd8d3;
  --primary:#0a0a0a;--primary-ink:#fff;--primary-hover:#2b2b2b;
  --focus:#0a0a0a;
  --bad:#b42318;--bad-bg:#fbeceb;--warn:#8a5600;--warn-bg:#f9f0df;--ok:#15784a;--ok-bg:#e8f3ec;
  --header:#fff;--header-line:rgba(10,10,10,.1);
  --window-line:rgba(10,10,10,.08);--window-shadow:0 1px 2px rgba(10,10,10,.04),0 12px 24px -16px rgba(10,10,10,.2);
  --scrim:rgba(10,10,10,.4);
  --font:Geist,ui-sans-serif,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --mono:'Geist Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --h1:clamp(40px,calc(22px + 3.2vw),68px);
  --h2:clamp(30px,calc(18px + 2.084vw),48px);
  --h3:18px;--lead:18px;--body:16px;--small:14px;--data:13px;
  --ease:cubic-bezier(.16,1,.3,1);
  --radius:16px;--stage:24px;--gutter:32px;--header-h:88px;
}
html[data-theme=dark]{
  color-scheme:dark;
  --bg:#0a0a0a;--surface:#141414;--surface-2:#1d1d1d;--surface-3:#282828;--raised:#1a1a1a;
  --ink:#f3f3f2;--ink-2:#d4d4d2;--muted:#a3a3a0;--faint:#8c8c89;
  --line:#232323;--line-strong:#343434;
  --primary:#f3f3f2;--primary-ink:#0a0a0a;--primary-hover:#d9d9d7;
  --focus:#f3f3f2;
  --bad:#f1928a;--bad-bg:rgba(241,146,138,.1);--warn:#e7b762;--warn-bg:rgba(231,183,98,.1);--ok:#72cf9b;--ok-bg:rgba(114,207,155,.1);
  --header:#0a0a0a;--header-line:rgba(255,255,255,.1);
  --window-line:rgba(255,255,255,.08);--window-shadow:0 1px 2px rgba(0,0,0,.3),0 12px 24px -16px rgba(0,0,0,.7);
  --scrim:rgba(0,0,0,.6);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:calc(var(--header-h) + 16px)}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font:400 var(--body)/1.6 var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
:where(h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote,pre){margin:0}
:where(p,li,dd,dt,td,th,figcaption,summary,a,h1,h2,h3,label,output){overflow-wrap:break-word}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--focus);outline-offset:3px}
::selection{background:var(--ink);color:var(--bg)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:16px;top:-80px;z-index:50;background:var(--primary);color:var(--primary-ink);padding:10px 16px;border-radius:999px;text-decoration:none;font-weight:500}
.skip:focus{top:12px}

.wrap{width:min(1200px,calc(100% - 2 * var(--gutter)));margin-inline:auto}
.narrow{max-width:760px;margin-inline:auto}

/* Type: large weight-400 headlines locked near line-height 1; the grey .tone sentence carries the detail.
   Labels are Geist Mono capitals. Running text stays 15 to 18 px. */
h1,.h1{font:400 var(--h1)/1.02 var(--font);letter-spacing:-.04em}
h1,h2,h3{text-wrap:balance}
p,li,dd{text-wrap:pretty}
h2,.h2{font:400 var(--h2)/1.06 var(--font);letter-spacing:-.035em}
h3,.h3{font:500 var(--h3)/1.35 var(--font);letter-spacing:-.01em}
.tone{color:var(--faint)}
.kicker{font:400 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--faint);margin-bottom:20px}
.lead{font-size:var(--lead);line-height:1.55;color:var(--muted)}
.muted{color:var(--muted)}
.fine{font-size:var(--small);color:var(--faint);line-height:1.5}
.num{font-variant-numeric:tabular-nums}
p+p{margin-top:1em}
strong{font-weight:500;color:var(--ink)}
code{font:400 .9em/1.4 var(--mono);background:var(--surface-2);padding:1px 6px;border-radius:6px;overflow-wrap:anywhere}

/* Buttons: one black pill per view, tonal pills for the rest. */
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border:0;border-radius:999px;background:var(--surface-2);color:var(--ink);font:500 15px/1.2 var(--font);text-decoration:none;white-space:nowrap;cursor:pointer;transition:background-color .2s var(--ease)}
.button:hover{background:var(--surface-3)}
.button.primary{background:var(--primary);color:var(--primary-ink)}
.button.primary:hover{background:var(--primary-hover)}
.button svg{width:16px;height:16px}
.button:disabled,.button[aria-disabled=true]{opacity:.45;cursor:default}
.text-link{color:var(--ink);text-decoration:underline;text-decoration-color:var(--line-strong);text-underline-offset:4px;text-decoration-thickness:1px}
.text-link:hover{text-decoration-color:currentColor}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.icon-button{display:grid;place-items:center;width:40px;height:40px;padding:0;border:0;border-radius:999px;background:none;color:var(--muted);cursor:pointer;transition:background-color .2s var(--ease),color .2s var(--ease)}
.icon-button svg{width:18px;height:18px}
.icon-button:hover{background:var(--surface-2);color:var(--ink)}

/* Header: a floating pill on a page-coloured strip, so nothing shows around the pill while the page scrolls.
   Once the page has scrolled, the strip gets a hairline. */
.site-header{position:sticky;top:0;z-index:20;height:var(--header-h);padding-top:16px;background:var(--header);border-bottom:1px solid transparent;transition:border-color .2s var(--ease)}
html.scrolled .site-header{border-bottom-color:var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:4px;width:max-content;max-width:calc(100% - 2 * var(--gutter));height:56px;padding:0 8px 0 16px;border:1px solid var(--header-line);border-radius:18px;background:var(--raised)}
.brand{display:inline-flex;align-items:center;gap:9px;min-height:44px;margin-right:20px;color:var(--ink);font:600 17px/1 var(--font);letter-spacing:-.03em;text-decoration:none;white-space:nowrap}
.brand svg{width:24px;height:24px}
.brand .mark-cut{stroke:var(--bg)}
.brand .mark-dot{fill:var(--bg)}
.nav{display:flex;gap:2px}
.nav a{padding:8px 12px;border-radius:999px;color:var(--muted);font:400 14px/1.2 var(--font);text-decoration:none;white-space:nowrap;transition:color .2s var(--ease),background-color .2s var(--ease)}
.nav a:hover{color:var(--ink)}
.nav a[aria-current=page]{color:var(--ink);background:var(--surface-2);font-weight:500}
.header-actions{display:flex;align-items:center;gap:4px;margin-left:12px}
.header-cta{min-height:40px;padding:0 6px 0 16px;font-size:14px}
.header-cta .cta-arrow{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:rgba(255,255,255,.16)}
html[data-theme=dark] .header-cta .cta-arrow{background:rgba(10,10,10,.12)}
.header-cta .cta-arrow svg{width:14px;height:14px}
.menu-button{display:none}
.theme-icon-dark{display:none}
html[data-theme=light] .theme-icon-dark{display:block}
html[data-theme=light] .theme-icon-light{display:none}

/* Phone menu: a modal dialog in the top layer, outside the blurred header. */
.menu{margin:0;padding:0;border:0;width:100%;max-width:none;height:100%;max-height:none;background:transparent;color:var(--ink)}
.menu::backdrop{background:var(--scrim)}
.menu-panel{display:flex;flex-direction:column;gap:8px;width:min(360px,100%);height:100%;margin-left:auto;padding:16px 20px 32px;overflow:auto;background:var(--bg);border-left:1px solid var(--line)}
.menu-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.menu-top .brand{margin-right:0}
.menu-group{border-top:1px solid var(--line);padding-top:12px;margin-top:8px}
.menu-group p{font:500 13px/1.4 var(--font);color:var(--faint);margin:2px 0 4px}
.menu a{display:flex;align-items:center;min-height:44px;text-decoration:none;font-size:17px}
.menu a[aria-current=page]{font-weight:500}
.menu-cta{margin-top:20px}
.menu-cta .button{width:100%}

/* Sections */
main{display:block}
.section{padding:120px 0}
.section.tight{padding:72px 0}
.section-head{max-width:760px;margin-bottom:56px}
.section-head.center{margin-inline:auto;text-align:center}
.section-head .lead{margin-top:20px}
.section-head .actions{margin-top:32px}
.center .actions{justify-content:center}

/* Hero: type on the page, then the product on a tonal stage. */
.hero{position:relative;padding:72px 0 0}
.hero.plain{padding-bottom:72px}
.hero-copy{max-width:880px;margin-inline:auto;text-align:center}
.hero-copy .lead{max-width:680px;margin:24px auto 0}
.hero-copy .actions{justify-content:center;margin-top:36px}
.hero.left .hero-copy{margin-inline:0;text-align:left}
.hero.left .hero-copy .lead{margin-inline:0}
.hero.left .hero-copy .actions{justify-content:flex-start}
.status-line{margin-top:20px;color:var(--faint);font-size:var(--small)}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);font:500 13px/1.3 var(--font);white-space:nowrap}

/* Cards: tone, not borders or shadows. */
.card{position:relative;padding:32px;border-radius:var(--radius);background:var(--surface)}
a.card{display:block;text-decoration:none;transition:background-color .25s var(--ease)}
a.card:hover{background:var(--surface-2)}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);font-size:15px;line-height:1.6}
.card .h1{color:var(--ink)}
.card .card-link{display:inline-block;margin-top:16px;font-weight:500;color:var(--ink)}
.grid{display:grid;gap:16px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.step-num{margin-bottom:32px;color:var(--faint);font:400 12px/1 var(--mono);letter-spacing:.06em;font-variant-numeric:tabular-nums}

/* Split layouts */
.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:64px;align-items:center}
.split.reverse{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.split.reverse>:first-child{order:2}
.split-copy .lead{margin-top:20px}
.split-copy .rows{margin-top:32px}

/* Plain rows on hairlines: a short title in ink, the detail in grey */
.rows{list-style:none;padding:0;margin:0}
.rows li{padding:18px 0;border-top:1px solid var(--line);color:var(--muted);font-size:15px;line-height:1.6}
.rows li:last-child{border-bottom:1px solid var(--line)}
.rows li strong{display:block;margin-bottom:4px;color:var(--ink);font-size:16px;font-weight:500;letter-spacing:-.01em}
.rows.compact li{padding:12px 0}

/* Points: short ideas side by side in columns, each under its own hairline, with a mono label */
.points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:48px 40px;margin:0;padding:0;list-style:none}
.points li{padding-top:20px;border-top:1px solid var(--line-strong)}
.points .label{display:block;margin-bottom:16px;color:var(--faint);font:400 12px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase}
.points h3{margin-bottom:8px;font-size:17px}
.points p{color:var(--muted);font-size:15px;line-height:1.6}

/* Rule table: a reference table with no box, mono column labels and hairline rows */
.rule-table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.5}
.rule-table th{padding:0 32px 14px 0;border-bottom:1px solid var(--line-strong);color:var(--faint);font:400 12px/1.2 var(--mono);letter-spacing:.06em;text-transform:uppercase;text-align:left;white-space:nowrap}
.rule-table td{padding:20px 32px 20px 0;border-bottom:1px solid var(--line);color:var(--muted);vertical-align:top}
.rule-table th:last-child,.rule-table td:last-child{padding-right:0}
.rule-table td:first-child{width:40%;color:var(--ink)}
.rule-table td:nth-child(2){width:18%;white-space:nowrap}
.tag{display:inline-flex;align-items:center;min-height:24px;padding:0 10px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);font:500 12px/1 var(--font);white-space:nowrap}

/* Figures: large, light numbers between hairlines */
.specs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.specs>div{display:flex;flex-direction:column;padding:32px 24px 28px;border-left:1px solid var(--line)}
.specs>div:first-child{border-left:0;padding-left:0}
.specs dt{order:2;color:var(--faint);font:400 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase}
.specs dd{margin-bottom:14px;font:400 52px/1 var(--font);letter-spacing:-.045em;font-variant-numeric:tabular-nums}
.specs-note{margin-top:14px}

/* Product window: the real app, framed by a hairline, resting on a tonal stage */
.window{position:relative;overflow:hidden;border:1px solid var(--window-line);border-radius:12px;background:var(--bg);box-shadow:var(--window-shadow)}
.window img{width:100%;height:auto}
html[data-theme=dark] .shot-light,html[data-theme=light] .shot-dark{display:none}
.replay{max-width:1200px;margin:56px auto 0;padding:24px;border-radius:var(--stage);background:var(--surface)}
.hero .replay{margin-top:72px}
.replay-bar{display:flex;align-items:center;gap:8px;margin-bottom:20px}
.replay-steps{display:flex;flex:1 1 auto;gap:2px;min-width:0;padding:3px;overflow-x:auto;border-radius:999px;background:var(--surface-2);scrollbar-width:none;scroll-behavior:smooth}
.replay-steps::-webkit-scrollbar{display:none}
.replay-step{position:relative;flex:0 0 auto;min-height:36px;padding:0 14px;overflow:hidden;border:0;border-radius:999px;background:none;color:var(--muted);font:500 14px/1 var(--font);white-space:nowrap;cursor:pointer;transition:color .2s var(--ease)}
.replay-step:hover{color:var(--ink)}
.replay-step[aria-selected=true]{background:var(--raised);color:var(--ink);box-shadow:0 0 0 1px var(--window-line),0 1px 2px rgba(10,10,10,.08)}
html[data-theme=dark] .replay-step[aria-selected=true]{background:var(--surface-3)}
.replay-step .n{margin-right:7px;color:var(--faint);font:400 12px/1 var(--mono);font-variant-numeric:tabular-nums}
.replay-step::after{content:'';position:absolute;left:14px;right:14px;bottom:4px;height:2px;border-radius:2px;background:currentColor;opacity:.35;transform:scaleX(0);transform-origin:left}
.replay[data-playing=true] .replay-step[aria-selected=true]::after{animation:replay-progress var(--interval,4200ms) linear forwards}
@keyframes replay-progress{to{transform:scaleX(1)}}
.replay-toggle .icon-play{display:none}
.replay[data-autoplay=off] .replay-toggle .icon-play{display:block}
.replay[data-autoplay=off] .replay-toggle .icon-pause{display:none}
.replay[data-motion=reduced] .replay-toggle{display:none}
.replay-stage{display:grid}
.frame{grid-area:1/1;opacity:0;visibility:hidden;transition:opacity .45s var(--ease),visibility 0s linear .45s}
.frame.is-active{opacity:1;visibility:visible;transition:opacity .45s var(--ease)}
.replay-captions{display:grid;margin-top:18px}
.replay-caption{grid-area:1/1;max-width:760px;visibility:hidden;color:var(--muted);font-size:15px;line-height:1.5}
.replay-caption.is-active{visibility:visible}
.replay-caption strong{color:var(--ink);font-weight:500}
.replay-foot{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-top:4px}
.shot-figure figcaption{margin-top:14px;color:var(--muted);font-size:15px}
.shot-zoom{position:relative;display:block;width:100%;padding:24px;border:0;border-radius:var(--stage);background:var(--surface);color:inherit;text-align:left;cursor:zoom-in}
.shot-zoom .window{display:block}
.zoom-hint{position:absolute;right:36px;bottom:36px;z-index:3;display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:999px;background:var(--primary);color:var(--primary-ink);font:500 13px/1 var(--font);opacity:0;transform:translateY(4px);transition:opacity .2s,transform .2s var(--ease)}
.zoom-hint svg{width:14px;height:14px}
.shot-zoom:hover .zoom-hint,.shot-zoom:focus-visible .zoom-hint{opacity:1;transform:none}
@media (hover:none){.zoom-hint{opacity:1;transform:none}}
.lightbox{width:min(1600px,96vw);max-width:none;max-height:94vh;padding:0;overflow:visible;border:0;background:transparent;color:var(--ink)}
.lightbox::backdrop{background:rgba(10,10,10,.82)}
.lightbox-body img{width:100%;height:auto;max-height:88vh;object-fit:contain;border-radius:12px;background:var(--bg)}
.lightbox-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:10px;color:#ededeb;font-size:14px}
.lightbox-bar .icon-button{background:rgba(255,255,255,.12);color:#f3f3f2}
.lightbox-bar .icon-button:hover{background:rgba(255,255,255,.2)}

/* Data table (the export sample keeps the app's 13 px data type) */
.table-wrap{max-width:100%;overflow:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--raised)}
.table-wrap:focus-visible{outline-offset:2px}
.data-table{min-width:100%;border-collapse:collapse;font-size:var(--data);line-height:1.4;white-space:nowrap}
.data-table th{padding:11px 14px;border-bottom:1px solid var(--line);background:var(--surface);color:var(--muted);font-weight:500;text-align:left}
.data-table td{padding:11px 14px;border-bottom:1px solid var(--line)}
.data-table tr:last-child td{border-bottom:0}
.data-table .added{background:var(--surface)}
.data-table th.added{background:var(--surface-2);color:var(--ink)}
.table-note{display:flex;flex-wrap:wrap;gap:6px 18px;margin-top:14px;color:var(--faint);font-size:var(--small)}
.legend-swatch{display:inline-block;width:10px;height:10px;margin-right:6px;border-radius:3px;background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--line-strong);vertical-align:-1px}

/* Status callout */
.callout{padding:20px 24px;border-radius:var(--radius);background:var(--surface);color:var(--muted);font-size:15px}
.callout strong{display:block;margin-bottom:4px;color:var(--ink)}
.callout+.callout{margin-top:12px}

/* FAQ */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 0;list-style:none;cursor:pointer;font:400 19px/1.4 var(--font);letter-spacing:-.015em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'';flex-shrink:0;width:9px;height:9px;border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);transform:rotate(45deg) translateY(-3px);transition:transform .2s var(--ease)}
.faq details[open] summary::after{transform:rotate(225deg) translateY(-1px)}
.faq .answer{max-width:760px;padding:0 0 24px;color:var(--muted)}

/* Final call to action */
.final{padding:24px 0 120px;text-align:center}
.final .final-panel{padding:96px 32px;border-radius:var(--stage);background:var(--surface)}
.final h2{max-width:760px;margin-inline:auto}
.final .lead{max-width:620px;margin:20px auto 0}
.final .actions{justify-content:center;margin-top:36px}

/* Breadcrumbs */
.crumbs{margin-bottom:28px;color:var(--muted);font-size:var(--small)}
.crumbs ol{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.crumbs li+li::before{content:'/';margin-right:8px;color:var(--faint)}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.hero-copy .crumbs ol{justify-content:center}
.hero.left .hero-copy .crumbs ol{justify-content:flex-start}

/* Related */
.related .card h3{font-size:18px}

/* Guide (long reading: body 18, subheads 28) */
.article-head{max-width:760px}
.article-head .lead{margin-top:20px}
.byline{display:flex;flex-wrap:wrap;gap:6px 16px;margin-top:24px;color:var(--faint);font-size:var(--small)}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:64px;align-items:start}
.prose{max-width:720px;font-size:18px;line-height:1.7}
.prose>*+*{margin-top:1.1em}
.prose h2{margin-top:2.2em;font:500 28px/1.2 var(--font);letter-spacing:-.025em}
.prose h3{margin-top:1.8em;font-size:20px}
.prose ul,.prose ol{padding-left:1.25em}
.prose li+li{margin-top:.45em}
.prose a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line-strong)}
.prose a:hover{text-decoration-color:currentColor}
.prose .callout{font-size:16px}
.prose figure{margin-top:2em}
.prose figcaption{margin-top:12px;color:var(--muted);font-size:15px}
.prose dl{display:grid;grid-template-columns:minmax(120px,max-content) 1fr;gap:10px 22px;padding-top:14px;border-top:1px solid var(--line);font-size:16px}
.prose dt{font-weight:500}
.prose dd{color:var(--muted)}
.toc{position:sticky;top:calc(var(--header-h) + 24px);padding-left:20px;border-left:1px solid var(--line);font-size:var(--small)}
.toc p{margin-bottom:10px;font-weight:500}
.toc ol{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.toc a{color:var(--muted);text-decoration:none}
.toc a:hover{color:var(--ink)}
.sources{color:var(--muted);font-size:15px}
.sources li+li{margin-top:.6em}

/* Tools */
.tool{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
.tool-panel{padding:32px}
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:260px;padding:32px;border:1px dashed var(--line-strong);border-radius:12px;background:var(--raised);text-align:center;transition:border-color .2s,background-color .2s}
.drop.is-over{border-color:var(--ink);background:var(--surface-2)}
.drop svg{width:40px;height:40px;margin-bottom:6px;color:var(--ink-2)}
.drop h2{font-size:22px;letter-spacing:-.02em}
.drop p{max-width:460px;color:var(--muted);font-size:15px}
.drop .actions{justify-content:center;margin-top:8px}
.privacy-note{display:flex;align-items:flex-start;gap:10px;margin-top:16px;color:var(--muted);font-size:var(--small)}
.privacy-note svg{width:16px;height:16px;margin-top:3px}
.tool-status{color:var(--muted);font-size:15px}
.tool-error{padding:16px 18px;border-radius:12px;background:var(--bad-bg);color:var(--ink)}
.tool-error strong{display:block;margin-bottom:4px}
.summary-line{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px 24px}
.summary-line h2{font-size:26px;letter-spacing:-.025em}
.counts{display:flex;flex-wrap:wrap;gap:8px}
.issue-list{margin:20px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}
.issue{border-bottom:1px solid var(--line)}
.issue details>summary{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:baseline;padding:16px 0;list-style:none;cursor:pointer}
.issue summary::-webkit-details-marker{display:none}
.issue-title{font-weight:500}
.issue-text{grid-column:2/4;color:var(--muted);font-size:15px}
.sev{padding:5px 9px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);font:500 12px/1 var(--font);white-space:nowrap}
.sev-error{background:var(--bad-bg);color:var(--bad)}
.sev-warning{background:var(--warn-bg);color:var(--warn)}
.issue-count{color:var(--muted);font-size:var(--small);font-variant-numeric:tabular-nums;white-space:nowrap}
.issue .examples{display:grid;gap:4px;margin:0 0 18px;padding:0;list-style:none;color:var(--muted);font-size:var(--small)}
.issue .examples code{font-size:13px}
.ok-line{padding:16px 0;border-bottom:1px solid var(--line);color:var(--muted)}
.fix-options{display:grid;gap:10px;margin:14px 0 18px}
.check{display:flex;align-items:flex-start;gap:10px;font-size:15px;cursor:pointer}
.check input{flex-shrink:0;width:18px;height:18px;margin:3px 0 0;accent-color:var(--ink)}
.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 24px}
.field{display:flex;flex-direction:column;gap:8px;color:var(--muted);font-size:var(--small)}
.field label{color:var(--ink);font-size:15px;font-weight:500}
.field .help{color:var(--faint);font-size:13px;line-height:1.45}
.field .error{min-height:0;color:var(--bad);font-size:13px}
.field .error:empty{display:none}
.input-wrap{display:flex;align-items:center;gap:6px;min-height:46px;padding:0 14px;border:1px solid var(--line-strong);border-radius:12px;background:var(--raised);transition:border-color .2s}
.input-wrap:focus-within{border-color:var(--ink)}
.input-wrap input{flex:1;min-width:0;padding:10px 0;border:0;background:none;outline:none;font-size:16px;font-variant-numeric:tabular-nums}
.input-wrap .unit{color:var(--muted);font-size:15px}
.input-wrap[data-invalid=true]{border-color:var(--bad)}
.totals{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:8px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.totals>div{padding:24px 20px;border-left:1px solid var(--line)}
.totals>div:first-child{border-left:0;padding-left:0}
.totals dt{color:var(--muted);font-size:var(--small)}
.totals dd{margin-top:6px;font:400 36px/1.1 var(--font);letter-spacing:-.035em;font-variant-numeric:tabular-nums}
.math{display:grid;gap:8px;margin:18px 0 0;padding:0;list-style:none;color:var(--muted);font-size:15px;font-variant-numeric:tabular-nums}
.math strong{color:var(--ink);font-weight:500}
.compare{margin-top:18px}

/* Footer */
.site-footer{padding:64px 0 40px;border-top:1px solid var(--line);color:var(--muted);font-size:var(--small)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(4,minmax(0,1fr));gap:32px}
.footer-grid h2{margin-bottom:14px;color:var(--faint);font:400 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase}
.footer-grid ul{display:grid;gap:2px;margin:0;padding:0;list-style:none}
.footer-grid a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none}
.footer-grid a:hover{color:var(--ink)}
.footer-about p{max-width:300px;margin-top:14px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:48px;padding-top:20px;border-top:1px solid var(--line);color:var(--faint)}

/* Scroll reveal (only when scripts run; anything above the reveal line shows; reduced motion shows everything) */
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
html.js .reveal.is-in{opacity:1;transform:none}
.grid.reveal-children>*{transition-delay:calc(var(--i,0) * 45ms)}

/* 404 */
.not-found{padding:120px 0;text-align:center}
.not-found .actions{justify-content:center;margin-top:28px}

@media (max-width:1180px){.nav a{padding:8px 9px}.brand{margin-right:12px}}
@media (max-width:1080px){
  .split,.split.reverse{grid-template-columns:minmax(0,1fr);gap:40px}
  .split.reverse>:first-child{order:0}
  .article-grid{grid-template-columns:minmax(0,1fr)}
  .toc{position:static;padding:16px 0;border-left:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-about{grid-column:1/-1}
}
@media (max-width:980px){
  .site-header .wrap{width:auto}
  .nav,.header-cta{display:none}
  .header-actions{margin-left:auto}
  .menu-button{display:grid}
  .grid.three{grid-template-columns:minmax(0,1fr)}
  .points{grid-template-columns:repeat(2,minmax(0,1fr))}
  .specs{grid-template-columns:repeat(2,minmax(0,1fr))}
  .specs>div:nth-child(3){border-left:0;padding-left:0}
  .specs>div:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width:640px){
  :root{--gutter:16px;--lead:17px;--header-h:76px;--stage:20px}
  .site-header{padding-top:12px}
  .site-header .wrap{height:52px;padding:0 6px 0 14px;border-radius:16px}
  .section{padding:80px 0}
  .section.tight{padding:56px 0}
  .section-head{margin-bottom:36px}
  .hero{padding-top:40px}
  .hero.plain{padding-bottom:48px}
  .hero-copy .lead{margin-top:18px}
  .hero-copy .actions{margin-top:28px}
  .actions .button{flex:1 1 100%}
  .hero .replay{margin-top:48px}
  .replay,.shot-zoom{padding:12px}
  .replay-bar{margin-bottom:12px}
  .replay-step{min-height:40px;padding:0 13px}
  .window{border-radius:10px}
  .zoom-hint{right:20px;bottom:20px}
  .grid.two{grid-template-columns:minmax(0,1fr)}
  .points{grid-template-columns:minmax(0,1fr);gap:28px}
  .card{padding:24px}
  /* Rule table rows stack: the case, its strength, then what happens */
  .rule-table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .rule-table tr{display:grid;gap:8px;padding:18px 0;border-bottom:1px solid var(--line)}
  .rule-table td{display:block;width:auto!important;padding:0;border:0;white-space:normal!important}
  .specs dd{font-size:36px}
  .specs>div{padding:22px 14px 20px}
  .faq summary{padding:20px 0;font-size:17px}
  .final{padding-bottom:80px}
  .final .final-panel{padding:64px 20px}
  .prose{font-size:17px}
  .prose h2{font-size:24px}
  .prose dl{grid-template-columns:minmax(0,1fr)}
  .prose dd{margin-bottom:8px}
  .tool-panel{padding:20px}
  .fields{grid-template-columns:minmax(0,1fr)}
  .totals{grid-template-columns:minmax(0,1fr)}
  .totals>div{padding-left:0;border-left:0;border-top:1px solid var(--line)}
  .totals>div:first-child{border-top:0}
  .issue details>summary{grid-template-columns:auto minmax(0,1fr)}
  .issue-count{grid-column:2}
  .issue-text{grid-column:1/-1}
  .footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px 20px}
  .site-footer{padding-top:48px}
  .drop{min-height:220px;padding:24px 16px}
}
@media (max-width:380px){.brand{font-size:16px}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  html.js .reveal{opacity:1;transform:none}
}
@media (prefers-contrast:more){:root{--line:#bdbab4;--line-strong:#8f8c86;--muted:#444}html[data-theme=dark]{--line:#4a4a4a;--line-strong:#6a6a6a;--muted:#c8c8c5}}
@media print{.site-header,.site-footer,.replay-bar{display:none}html.js .reveal{opacity:1;transform:none}}