@layer base, layout, tool, dialog, responsive, screen;
@layer base {
  :root { color-scheme: light; --paper:#f6f5ef; --ink:#203e33; --muted:#53665c; --green:#1e493b; --line:#d7dfd4; --yellow:#f5d55d; --white:#fffef9; --accent:#a84228; font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; font-synthesis:none; }
  * { box-sizing:border-box; }
  html { scroll-behavior:smooth; scroll-padding-top:24px; }
  body { margin:0; background:var(--paper); color:var(--ink); font-size:16px; line-height:1.55; }
  button,input,select,textarea { font:inherit; color:inherit; }
  button,a,input,select,summary { -webkit-tap-highlight-color:transparent; }
  button,select,summary { cursor:pointer; }
  button { border:0; }
  button:disabled { cursor:default; opacity:.55; }
  a { color:inherit; text-underline-offset:4px; }
  :focus-visible { outline:3px solid #15695b; outline-offset:4px; }
  [hidden] { display:none !important; }
  h1,h2,h3,p { margin:0; }
  h1,h2,h3 { line-height:1.08; }
  h2 { font-size:clamp(30px,4vw,44px); font-weight:550; letter-spacing:-1.5px; }
  h3 { font-size:21px; font-weight:600; letter-spacing:-.45px; }
  p { text-wrap:pretty; }
  .wrap { width:min(1120px,calc(100% - 64px)); margin-inline:auto; }
  .eyebrow { font-size:11px; font-weight:750; letter-spacing:1.8px; line-height:1.6; }
  .button { min-height:46px; display:inline-flex; align-items:center; justify-content:center; gap:20px; padding:11px 20px; border-radius:9px; font-size:14px; font-weight:650; line-height:1.4; text-decoration:none; white-space:normal; }
  .primary { background:var(--green); color:white; }
  .primary:hover { background:#123327; }
  .secondary { background:var(--white); border:1px solid #c3cec1; }
  .secondary:hover { background:#eaf0e5; }
  .text-button { padding:10px 12px; min-height:46px; background:transparent; text-decoration:underline; text-underline-offset:4px; font-size:14px; }
  .skip-link { position:absolute; top:-100px; left:20px; z-index:10; background:white; padding:12px; }
  .skip-link:focus { top:10px; }
}
@layer screen {
  .friends-teaser { display:grid; grid-template-columns:1.25fr 1fr; align-items:center; gap:36px; margin-block:48px; padding:32px; border:1px solid var(--line); border-radius:18px; background:var(--white); }
  .friends-teaser h2 { margin-block:12px 16px; font-size:clamp(28px,3.4vw,40px); }
  .friends-teaser p:not(.eyebrow) { max-width:480px; color:var(--muted); font-size:15px; }
  .friends-teaser .button { margin-top:22px; }
  .friends-teaser-art { display:flex; align-items:center; min-height:150px; }
  .teaser-person { display:grid; place-items:center; flex:0 0 66px; height:66px; border-radius:50%; background:var(--green); color:var(--white); font-size:13px; font-weight:650; }
  .teaser-person:last-child { background:var(--yellow); color:var(--ink); }
  .teaser-ticks { flex:1; position:relative; height:30px; border-bottom:2px solid var(--green); background:repeating-linear-gradient(90deg,transparent 0 11px,var(--line) 11px 12px); }
  .teaser-ticks span { position:absolute; top:-30px; width:100%; text-align:center; color:var(--muted); font-size:12px; white-space:nowrap; }
  .hero { padding:24px 0 27px; }
  h1 { font-size:clamp(38px,5.1vw,65px); letter-spacing:-2.4px; margin:13px 0 17px; }
  .hero-description { font-size:17px; max-width:740px; margin-inline:auto; }
  .hero-note { margin-top:13px; }
  .measure-card.wrap { width:100%; max-width:none; border-radius:0; border-inline:0; box-shadow:none; }
  .calibration-banner { padding-inline:max(24px,calc((100% - 1120px)/2)); }
  .tool-heading,.toolbar,.tool-footer,.calibration-footnote,.feedback,.screen-details,#viewport-summary,.fit-notice,.ruler-instruction { width:min(1180px,100%); margin-inline:auto; padding-inline:30px; }
  .ruler-viewport { overflow:clip; height:244px; touch-action:pan-y pinch-zoom; }
  .ruler-track { width:100%; height:100%; }
  .ruler-viewport.vertical { height:clamp(300px,65dvh,800px); overflow:clip; touch-action:pan-y pinch-zoom; }
  .vertical .ruler-track { height:100%; }
  .vertical .marker .handle { left:46%; }
  .vertical .marker.end .handle { left:62%; }
  #viewport-summary { font-size:11px; color:var(--muted); padding-block:9px 0; }
  #expand-ruler { margin-left:auto; min-height:44px; font-size:12px; }
  .snap { margin-left:0; }
  .screen-details { border:0; padding-block:5px 12px; }
  .screen-details summary { font-size:11px; min-height:25px; font-weight:500; }
  .screen-details p { font-size:12px; margin-top:5px; }
  .fit-notice { display:flex; flex-wrap:wrap; align-items:center; gap:8px 20px; padding-block:13px; background:#f4efdc; font-size:12px; }
  .fit-notice p { flex:1; min-width:200px; }
  .fit-notice button { min-height:44px; padding:8px 12px; border-radius:8px; background:var(--green); color:white; }
  .guide-links { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:20px; margin-block:0 70px; }
  .guide-links > div { grid-column:1 / -1; margin-bottom:8px; }
  .guide-link { display:flex; flex-direction:column; border:1px solid var(--line); border-radius:14px; padding:25px; text-decoration:none; background:var(--white); }
  .guide-link:hover { background:#eaf0e4; }
  .guide-link h3 { font-size:22px; margin-bottom:12px; }
  .guide-link p { color:var(--muted); font-size:14px; }
  .guide-link > span { margin-top:auto; padding-top:12px; }
  .guide-page { max-width:850px; }
  .article-header { padding:42px 0 28px; }
  .article-header h1 { font-size:clamp(35px,5vw,55px); margin-block:20px; }
  .article-header p { color:var(--muted); font-size:18px; }
  .article-header .eyebrow { font-size:11px; }
  .article-header .button { margin-top:20px; }
  .article-contents { display:flex; flex-wrap:wrap; gap:4px 18px; padding:14px 0; border-block:1px solid var(--line); font-size:14px; }
  .article-contents strong { flex-basis:100%; }
  .article-body .article-contents ul { display:flex; flex-wrap:wrap; gap:4px 18px; list-style:none; margin:0; padding:0; }
  .article-body .article-contents li { padding:0; }
  .article-contents a { display:inline-flex; align-items:center; min-height:44px; padding-block:8px; }
  .article-body { font-size:17px; line-height:1.75; }
  .article-body h2 { font-size:29px; margin:38px 0 17px; letter-spacing:-.8px; }
  .article-body h3 { font-size:22px; margin:24px 0 12px; }
  .article-body p,.article-body ul,.article-body ol { margin-block:15px; }
  .article-body li { padding:4px 0; }
  .article-body .method-chooser { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; list-style:none; padding:0; margin-block:22px; }
  .article-body .method-chooser li { padding:0; }
  .method-chooser a { display:flex; flex-direction:column; gap:7px; height:100%; min-height:44px; padding:20px; border:1px solid var(--line); border-radius:12px; background:var(--white); text-decoration:none; line-height:1.5; }
  .method-chooser a:hover { background:#eaf0e4; }
  .method-chooser strong { font-size:17px; }
  .method-chooser span { color:var(--muted); font-size:14px; }
  .article-note { border-left:3px solid #789b64; padding:18px 24px; margin-block:30px; background:#eaf0e4; border-radius:0 12px 12px 0; }
  .article-table { border-collapse:collapse; width:100%; font-size:15px; margin-block:24px; }
  .article-table th,.article-table td { text-align:left; padding:12px; border-bottom:1px solid var(--line); }
  .article-table th { background:#eaf0e4; }
  .ruler-example { margin:24px 0; padding:16px; border:1px solid var(--line); border-radius:12px; background:var(--white); }
  .ruler-example svg { display:block; width:100%; height:auto; }
  .method-example svg { max-width:560px; margin-inline:auto; }
  .ruler-example figcaption { margin-top:12px; font-size:14px; line-height:1.5; color:var(--muted); }
  .guide-page + .site-footer { margin-top:60px; }
  body.ruler-focus { overflow:hidden; }
  body.ruler-focus main > :not(#measure),body.ruler-focus > :not(main):not(script) { display:none; }
  .measure-card.ruler-expanded { position:fixed; inset:0; z-index:100; width:100%; height:100dvh; max-width:none; border:0; border-radius:0; overflow:hidden; background:var(--yellow); }
  .ruler-expanded .ruler-viewport { position:absolute; inset:0; width:100%; height:100%; min-height:0; border:0; border-radius:0; }
  .ruler-expanded .ruler-instruction,.ruler-expanded .calibration-footnote,.ruler-expanded .screen-details,.ruler-expanded #viewport-summary { display:none; }
  .ruler-expanded .feedback { position:absolute; width:1px; height:1px; overflow:hidden; clip-path:inset(50%); white-space:nowrap; padding:0; }
  .focus-dock { position:absolute; z-index:5; bottom:max(18px,env(safe-area-inset-bottom)); left:50%; transform:translateX(-50%); width:240px; max-width:calc(100% - 112px); padding:8px; display:grid; grid-template-columns:1fr auto; gap:6px; border:1px solid #c7bb84; border-radius:16px; background:#fffef9f5; box-shadow:0 5px 22px #55451825; }
  .focus-reading { grid-column:1 / -1; display:flex; align-items:baseline; justify-content:center; flex-wrap:wrap; gap:3px 10px; line-height:1.3; font-variant-numeric:tabular-nums; }
  .focus-reading strong { font-size:22px; }.focus-reading span { font-size:12px; }
  .focus-dock .button { min-height:44px; font-size:12px; padding:8px 10px; }
  .focus-dock #expand-ruler { min-width:50px; margin:0; }
  .focus-calibrate { grid-column:1 / -1; padding:8px; min-height:44px; border-radius:8px; font-size:12px; font-weight:650; line-height:1.3; background:var(--green); color:white; }
  .focus-panel { position:absolute; z-index:6; left:50%; top:max(14px,env(safe-area-inset-top)); transform:translateX(-50%); width:min(470px,calc(100% - 32px)); max-height:calc(100% - 185px - env(safe-area-inset-bottom) - env(safe-area-inset-top)); overflow:auto; overscroll-behavior:contain; background:var(--white); border:1px solid var(--line); border-radius:16px; box-shadow:0 10px 40px #14281a40; }
  .focus-panel-heading { display:flex; align-items:center; justify-content:space-between; padding:4px 16px; border-bottom:1px solid var(--line); }
  .focus-panel .calibration-banner { display:flex; flex-wrap:wrap; padding:12px 16px; gap:10px; }
  .focus-panel .calibration-banner p,.focus-panel .step-badge { display:none; }
  .focus-panel .calibration-banner strong { font-size:14px; }
  .focus-panel .tool-heading { padding:12px 16px; }.focus-panel .tool-heading .eyebrow { display:none; }
  .focus-panel .reading output { font-size:30px; }.focus-panel .state-label { font-size:11px; }
  .focus-panel .toolbar { padding:4px 16px 12px; gap:8px; }.focus-panel .toolbar .snap { display:flex; min-height:44px; }
  .focus-panel .tool-footer { padding:12px 16px; gap:12px; }.focus-panel .division-picker { width:100%; justify-content:space-between; }
  .focus-panel .division-picker select { max-width:180px; min-height:44px; }
  .focus-panel .actions { width:100%; }.focus-panel .actions .button { flex:1; }
  .focus-panel #copy-fallback { padding:12px 16px; width:100%; }
  .device-calibration { border:1px solid var(--line); border-radius:10px; padding:10px 14px; margin:16px 0; background:#edf2e8; }
  .device-calibration summary { min-height:44px; display:list-item; align-content:center; font-size:14px; font-weight:650; }
  .device-calibration p { margin:8px 0; font-size:13px; }
  .device-calibration label { display:block; margin-top:12px; font-size:13px; font-weight:600; }
  .device-calibration select { width:100%; min-height:46px; font-size:16px; padding:8px; margin:6px 0; border:1px solid #9aaf95; border-radius:7px; background:var(--white); }
  .device-calibration .button { width:100%; }
  .ruler-expanded .marker.start .handle { top:35%; }
  .ruler-expanded .marker.end .handle { top:65%; }
  .ruler-expanded .vertical .marker .handle { top:0; }
  .ruler-expanded .marker { z-index:auto; }
  .ruler-expanded .marker::before { z-index:3; pointer-events:none; }
  .ruler-expanded .handle { z-index:4; }
  @media(max-width:800px) {
    .friends-teaser { grid-template-columns:1fr; gap:18px; }
    .friends-teaser-art { min-height:110px; max-width:420px; width:100%; margin-inline:auto; }
    .guide-links { grid-template-columns:1fr; }
  }
  @media(max-width:560px) {
    .site-header { flex-wrap:wrap; }
    .friends-teaser { padding:22px; margin-block:30px; }
    .hero h1 span { display:block; }
    .site-header { gap:8px; }
    .site-header nav { gap:10px; }
    .site-header nav a { white-space:nowrap; }
    dialog { width:calc(100% - 16px); max-width:calc(100% - 16px); padding:16px; }
    .hero { padding:9px 0 18px; } h1 { font-size:33px; line-height:1.09; letter-spacing:-1.4px; margin:9px 0 12px; }
    .hero .eyebrow { font-size:9px; letter-spacing:1px; }
    .hero-description { font-size:13px; }.hero-note { font-size:11px; }
    .tool-heading,.toolbar,.tool-footer,.calibration-footnote,.feedback,.screen-details,#viewport-summary,.fit-notice,.ruler-instruction { padding-inline:16px; }
    .calibration-banner { padding:12px 16px; }
    .calibration-banner p { display:none; }
    .toolbar { gap:8px; }.toolbar .snap { order:4; flex-basis:100%; min-height:28px; }
    #expand-ruler { padding:8px 10px; min-width:96px; font-size:11px; }
    .vertical .marker .handle { left:44%; }.vertical .marker.end .handle { left:69%; }
    .guide-links { grid-template-columns:1fr; margin-bottom:45px; }
    .guide-link { padding:22px; }.guide-link h3 { font-size:21px; }
    .article-header { padding-top:25px; }.article-header p,.article-body { font-size:16px; }
    .article-body .method-chooser { grid-template-columns:1fr; }
    .article-table { font-size:13px; }.article-table th,.article-table td { padding:10px 7px; }
    .focus-panel .tool-heading { align-items:center; }.focus-panel .reading output { font-size:26px; }
    .focus-panel .state-label { max-width:130px; }.focus-panel .toolbar .snap { flex-basis:100%; }
    .device-calibration { padding:8px 10px; }
  }
  @media(max-height:500px) and (orientation:landscape) {
    .focus-dock { left:auto; right:max(54px,env(safe-area-inset-right)); top:max(66px,env(safe-area-inset-top)); bottom:auto; transform:none; width:230px; }
    .focus-panel { top:max(8px,env(safe-area-inset-top)); left:max(10px,env(safe-area-inset-left)); transform:none; width:min(450px,calc(100% - 90px)); max-height:calc(100% - 16px - env(safe-area-inset-top) - env(safe-area-inset-bottom)); }
  }
  @media(max-width:700px) and (max-height:500px) and (orientation:landscape) {
    .focus-dock { left:50%; right:auto; top:auto; bottom:max(8px,env(safe-area-inset-bottom)); transform:translateX(-50%); }
    .focus-panel { left:50%; transform:translateX(-50%); width:calc(100% - 32px); max-height:calc(100% - 185px - env(safe-area-inset-top) - env(safe-area-inset-bottom)); }
  }
  @media(orientation:landscape) {
    .measure-card:not(.ruler-expanded) > :is(.calibration-banner,.tool-heading,.toolbar,.tool-footer,.ruler-instruction,.calibration-footnote,.screen-details,.feedback,#viewport-summary),.site-header { padding-inline-start:max(16px,env(safe-area-inset-left)); padding-inline-end:max(16px,env(safe-area-inset-right)); }
  }
  dialog { max-height:calc(100dvh - max(16px,env(safe-area-inset-top)) - max(16px,env(safe-area-inset-bottom))); }
}
@layer layout {
  .site-header { display:flex; align-items:center; justify-content:space-between; padding-block:27px; }
  .brand { display:inline-flex; align-items:center; gap:9px; font-size:28px; font-weight:750; letter-spacing:-1.3px; text-decoration:none; }
  .brand-dot { color:#608764; margin-left:-8px; }
  .site-header nav { display:flex; gap:30px; font-size:14px; }
  .site-header nav a { text-decoration:none; padding:12px 0; }
  .hero { text-align:center; padding:45px 0 37px; }
  .hero .eyebrow { color:#496346; }
  h1 { font-size:clamp(48px,7vw,82px); font-weight:550; letter-spacing:-4px; margin:15px 0 23px; }
  h1 span { font-family:Georgia,serif; font-style:italic; font-weight:400; color:#547551; }
  .hero-description { font-size:18px; line-height:1.65; color:var(--muted); }
  .hero-note { margin-top:20px; font-size:12px; color:var(--muted); }
  .small-dot { display:inline-block; width:7px; height:7px; border-radius:50%; background:#64875a; margin-right:7px; }
  .mobile-break { display:none; }
  .trust-strip { display:flex; flex-wrap:wrap; justify-content:center; gap:18px 38px; font-size:12px; color:var(--muted); padding:23px 0 0; }
  .trust-strip span span { margin-right:6px; color:#547551; }
  .calibration-options { padding-top:64px; }
  .options-intro { max-width:690px; }
  .options-intro h2 { margin:12px 0 18px; }
  .options-intro>p:last-child,.options-note { color:var(--muted); font-size:14px; }
  .reference-cards { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:18px; margin-top:28px; }
  .reference-cards article { display:flex; flex-direction:column; align-items:flex-start; border:1px solid var(--line); border-radius:15px; padding:24px; background:var(--white); }
  .reference-cards article:first-child { background:#eaf0e4; }
  .object-tag { font-size:10px; letter-spacing:1px; font-weight:700; margin:18px 0 10px; color:var(--muted); }
  .reference-cards h3 { margin-bottom:12px; }
  .reference-cards article>p:not(.object-tag) { font-size:14px; color:var(--muted); margin-bottom:16px; }
  .reference-cards a { display:inline-flex; align-items:center; gap:12px; min-height:44px; margin-top:auto; font-size:14px; font-weight:650; }
  .object-illustration { display:block; position:relative; width:54px; height:46px; }
  .card-illustration::before { content:""; position:absolute; left:12px; top:0; width:28px; height:44px; border:2px solid var(--green); border-radius:5px; background:#f5d55d60; }
  .card-illustration::after { content:""; position:absolute; left:12px; top:33px; width:28px; border-top:3px solid var(--accent); }
  .coin-illustration::before { content:""; position:absolute; left:5px; top:0; width:42px; height:42px; border:2px solid var(--green); border-radius:50%; background:#f5d55d60; }
  .coin-illustration::after { content:""; position:absolute; left:5px; top:22px; width:44px; border-top:2px dashed var(--accent); }
  .ruler-illustration::before { content:""; position:absolute; left:0; top:11px; width:54px; height:25px; border:2px solid var(--green); border-radius:3px; background:repeating-linear-gradient(90deg,transparent 0 7px,var(--green) 7px 8px) 0 0/100% 10px no-repeat,#f5d55d60; }
  .options-note { margin-top:20px; }
  .guide { display:grid; grid-template-columns:1fr 1.15fr; gap:100px; padding:106px 0 84px; }
  .section-intro h2,.reference-section h2,.app-section h2,.faq h2 { margin:16px 0 22px; }
  .section-intro p:last-child { max-width:350px; color:var(--muted); }
  .steps { margin:0; padding:0; list-style:none; }
  .steps li { display:flex; gap:23px; padding:0 0 28px; }
  .steps li:last-child { padding-bottom:0; }
  .step-number { font-family:Georgia,serif; font-style:italic; font-size:25px; color:#60825d; line-height:1; }
  .steps p { margin-top:10px; font-size:14px; color:var(--muted); }
  .reference-section { display:grid; grid-template-columns:1fr 1fr; gap:90px; align-items:center; border-top:1px solid var(--line); padding:64px 0; }
  .reference-section p:not(.eyebrow) { color:var(--muted); font-size:15px; margin-top:12px; }
  .conversion-card { border:1px solid var(--line); border-radius:16px; padding:24px 32px; background:#edf0e5; }
  .conversion-card>div { display:grid; grid-template-columns:1fr 24px 1fr; gap:10px; align-items:center; border-bottom:1px solid #d3dbcc; padding:18px 0; }
  .conversion-card strong { font-size:22px; font-weight:550; letter-spacing:-.5px; }
  .conversion-card p { font-size:12px !important; padding-top:8px; }
  .app-section { display:grid; grid-template-columns:.8fr 1fr; gap:64px; background:#e5ecdd; padding:52px 64px; border-radius:22px; margin-block:20px 85px; }
  .app-section p:not(.eyebrow) { font-size:15px; margin-top:16px; }
  .app-section .availability { font-size:12px !important; color:var(--muted); }
  .app-section .button { margin-top:22px; }
  .app-art { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:25px; }
  .app-icon { width:138px; height:138px; border-radius:31px; background:var(--yellow); transform:rotate(-10deg); box-shadow:10px 18px 35px #25392a15; display:flex; justify-content:space-evenly; overflow:hidden; border:1px solid #d1b747; position:relative; }
  .app-icon i { width:2px; height:32px; background:#766726; }
  .app-icon i:nth-of-type(3n) { height:50px; }
  .app-icon span { position:absolute; top:64px; font-size:30px; font-weight:500; }
  .app-icon span:first-child { left:20px; }.app-icon span:nth-of-type(2) { right:20px; }
  .app-art-label { font-family:Georgia,serif; font-style:italic; font-size:24px; line-height:1.2; text-align:center; color:#56734c; }
  .faq { display:grid; grid-template-columns:.85fr 1.3fr; gap:70px; padding-bottom:80px; }
  details { border-top:1px solid var(--line); padding:19px 0; }
  details:last-child { border-bottom:1px solid var(--line); }
  summary { min-height:28px; font-size:16px; font-weight:600; padding-right:10px; }
  details p { color:var(--muted); font-size:14px; margin-top:13px; }
  .site-footer { border-top:1px solid var(--line); padding-block:28px 36px; display:flex; align-items:center; justify-content:space-between; gap:20px; }
  .site-footer p,.site-footer>a:last-child { font-size:12px; }
}
@layer tool {
  .measure-card { background:var(--white); border:1px solid #d5dccf; border-radius:18px; overflow:hidden; box-shadow:0 14px 40px #283b2810; }
  .calibration-banner { padding:20px 26px; background:#eaf0e4; border-bottom:1px solid #d6dfce; display:flex; gap:20px; align-items:center; justify-content:space-between; }
  .calibration-banner>div { display:flex; gap:14px; align-items:center; }
  .calibration-banner strong { font-size:14px; font-weight:650; }
  .calibration-banner p { font-size:12px; margin-top:3px; color:var(--muted); }
  .step-badge { flex-shrink:0; border:1px solid #b7c6ae; width:34px; height:34px; display:grid; place-items:center; border-radius:50%; font-size:12px; }
  .calibration-banner .button { flex-shrink:0; }
  .calibration-banner.calibrated { background:#f2f5ed; }
  .tool-heading { display:flex; gap:20px; justify-content:space-between; align-items:center; padding:27px 30px 20px; }
  .tool-heading .eyebrow { color:var(--muted); font-size:10px; }
  .reading { display:flex; flex-wrap:wrap; align-items:baseline; gap:15px; }
  .reading output { font-size:42px; line-height:1.3; letter-spacing:-1.5px; font-variant-numeric:tabular-nums; font-weight:550; }
  .reading>span { color:var(--muted); font-size:16px; font-variant-numeric:tabular-nums; }
  .state-label { font-size:11px; border:1px solid #d3dacd; border-radius:20px; padding:7px 12px; background:#f4f5ef; }
  #division-summary { font-size:12px; color:var(--muted); margin-top:4px; }
  .toolbar { display:flex; gap:15px; align-items:center; flex-wrap:wrap; padding:0 30px 15px; }
  .segmented { display:inline-flex; padding:3px; border:1px solid var(--line); border-radius:9px; background:#f3f4ed; }
  .segmented button { min-width:46px; min-height:38px; padding:8px 13px; border-radius:6px; background:transparent; font-size:13px; }
  .segmented button[aria-pressed="true"] { background:var(--green); color:white; }
  .snap { display:flex; gap:8px; align-items:center; font-size:13px; min-height:44px; margin-left:auto; }
  input[type="checkbox"] { width:18px; height:18px; flex-shrink:0; accent-color:var(--green); }
  .ruler-instruction { font-size:12px; color:var(--muted); margin:0 30px 13px; }
  .ruler-viewport { width:100%; height:244px; overflow:auto; overscroll-behavior-x:contain; background:var(--yellow); position:relative; scrollbar-color:#76692f #eacf61; scrollbar-width:thin; border-block:1px solid #cfb643; }
  .ruler-track { width:1954px; height:226px; position:relative; isolation:isolate; }
  #ticks { position:absolute; inset:0; width:100%; height:100%; pointer-events:none; z-index:1; }
  .selection { position:absolute; top:0; height:100%; left:32px; width:189px; background:#ffffe740; border-inline:1px solid #a8422855; pointer-events:none; }
  .marker { position:absolute; top:0; height:100%; width:0; z-index:3; }
  .marker::before { content:""; position:absolute; top:0; left:-.75px; height:100%; width:1.5px; background:linear-gradient(to bottom,var(--accent) 0 35px,transparent 35px 58px,var(--accent) 58px 100%); }
  .marker.start { left:32px; }.marker.end { left:221px; }
  .handle { position:absolute; left:0; top:83px; transform:translateX(-50%); min-height:48px; min-width:46px; padding:6px 10px; display:flex; flex-direction:column; gap:1px; align-items:center; justify-content:center; background:var(--green); color:white; border-radius:9px; cursor:ew-resize; touch-action:none; user-select:none; border:2px solid var(--yellow); box-shadow:0 3px 8px #76611a26; }
  .handle>span:first-child { font-size:13px; font-weight:700; }
  .handle-value { white-space:nowrap; font-size:10px; font-variant-numeric:tabular-nums; }
  .marker.start .handle { top:60px; }
  .marker.end .handle { top:132px; }
  .marker .handle:disabled { opacity:1; background:#56604d; cursor:default; }
  .division-guide { position:absolute; height:100%; top:0; width:0; border-left:1px dashed #9e6625; pointer-events:none; }
  .ruler-viewport.vertical { height:440px; overscroll-behavior-y:contain; overscroll-behavior-x:auto; }
  .vertical .ruler-track { width:100%; height:1954px; }
  .vertical .selection { width:100%; height:189px; left:0; top:32px; border-inline:0; border-block:1px solid #a8422855; }
  .vertical .marker { height:0; width:100%; left:0 !important; }
  .vertical .marker::before { top:-.75px; left:0; height:1.5px; width:100%; background:linear-gradient(to right,var(--accent) 0 35px,transparent 35px 70px,var(--accent) 70px 100%); }
  .vertical .marker .handle { top:0; left:42%; transform:translate(-50%,-50%); cursor:ns-resize; }
  .vertical .marker.end .handle { left:68%; }
  .vertical .division-guide { width:100%; height:0; left:0; border-left:0; border-top:1px dashed #9e6625; }
  .endpoint-retrieval { display:flex; justify-content:space-between; padding:0 25px; }
  .endpoint-retrieval button { background:#eaf0e4; margin-top:8px; min-height:44px; padding:8px 12px; border-radius:8px; font-size:12px; }
  .tool-footer { display:flex; flex-wrap:wrap; gap:15px; align-items:center; justify-content:space-between; padding:19px 30px 8px; }
  .division-picker { display:flex; gap:10px; align-items:center; flex-wrap:wrap; font-size:12px; }
  select { min-height:44px; border:1px solid #bdc9b7; border-radius:7px; padding:8px 30px 8px 10px; background:var(--white); font-size:13px; max-width:100%; }
  .actions { display:flex; gap:8px; align-items:center; }
  .actions .button { min-width:81px; }
  .calibration-footnote { font-size:11px; color:var(--muted); padding:6px 30px 0; }
  .feedback { min-height:35px; padding:7px 30px 10px; font-size:12px; color:#385c32; }
  .copy-fallback { padding:0 30px 25px; font-size:13px; }
  .copy-fallback textarea { display:block; width:100%; margin-top:10px; padding:10px; border:1px solid var(--line); }
  .notice { padding:20px; background:#ffefd0; }
}
@layer dialog {
  dialog { width:min(560px,calc(100% - 24px)); max-height:calc(100dvh - 32px); padding:30px; border:1px solid var(--line); border-radius:18px; background:var(--white); color:var(--ink); box-shadow:0 25px 100px #14281a40; }
  dialog::backdrop { background:#142b2466; backdrop-filter:blur(3px); }
  .dialog-heading { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:8px; }
  .dialog-heading h2 { font-size:28px; margin:0; letter-spacing:-1px; }
  .dialog-heading .icon-button { flex-shrink:0; }
  .icon-button { min-width:44px; min-height:44px; border-radius:50%; background:#eef2e7; font-size:26px; line-height:1; }
  dialog h2 { font-size:32px; margin-bottom:15px; }
  dialog p { font-size:14px; color:var(--muted); }
  .reference-methods { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:8px; min-width:0; border:0; padding:0; margin:18px 0 12px; }
  .reference-methods legend { font-size:12px; font-weight:650; padding:0; margin-bottom:8px; }
  .reference-methods label { position:relative; min-width:0; cursor:pointer; }
  .reference-methods input { position:absolute; opacity:0; width:1px; height:1px; }
  .reference-methods label>span { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:3px; padding:10px 3px; height:100%; border:1px solid #b9c7b4; border-radius:9px; text-align:center; }
  .reference-methods strong { font-size:13px; line-height:1.3; }
  .reference-methods small { font-size:10px; line-height:1.4; }
  .reference-methods input:checked+span { background:var(--green); color:white; border-color:var(--green); }
  .reference-methods input:focus-visible+span { outline:3px solid #15695b; outline-offset:3px; }
  .reference-methods svg { width:35px; height:28px; fill:none; stroke:currentColor; stroke-width:1.5; }
  .reference-methods .icon-measure { stroke:var(--accent); stroke-width:2.5; }
  .reference-methods input:checked+span .icon-measure { stroke:var(--yellow); }
  .reference-picker { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:12px 0; font-size:13px; }
  .reference-picker select { flex:1; min-width:0; }
  .reference-help { font-size:13px; margin:12px 0 16px; }
  .reference-step { display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between; gap:6px; margin-bottom:10px; font-size:12px; }
  #reference-caption { color:var(--muted); }
  .reference-space { width:100%; height:76px; display:flex; align-items:center; justify-content:flex-start; overflow:hidden; padding:0 4px; background:#f5f0d8; border-radius:8px; }
  .reference-line { flex-shrink:0; width:188.976px; height:28px; position:relative; }
  .reference-line svg { display:block; }
  .calibration-adjust { display:flex; align-items:center; gap:14px; margin-top:12px; }
  .calibration-adjust input { flex:1; min-width:0; accent-color:var(--green); min-height:44px; }
  .calibration-adjust button { min-width:44px; padding:8px; font-size:22px; }
  .small-help { font-size:12px !important; margin-top:12px; }
  .confirmation { display:flex; align-items:center; gap:9px; font-size:14px; min-height:44px; margin:12px 0 4px; }
  .save-calibration { width:100%; margin-top:12px; }
  .error { color:#a03c26; font-size:13px; }
}
@layer responsive {
  @media(min-width:1500px) { .hero { padding-top:60px; padding-bottom:44px; } }
  @media(max-width:800px) {
    .reference-cards { gap:12px; }.reference-cards article { padding:18px; }
    .wrap { width:calc(100% - 40px); }.hero { padding-top:32px; } h1 { letter-spacing:-2.5px; }
    .guide { gap:45px; padding-block:70px; }.reference-section { gap:35px; }.app-section { padding:36px; gap:30px; }.faq { gap:30px; grid-template-columns:.8fr 1.2fr; }
    .tool-heading,.toolbar { padding-inline:22px; }.ruler-instruction { margin-inline:22px; }.tool-footer { padding-inline:22px; }
    .calibration-banner { padding:18px 20px; }.step-badge { display:none; }.axis-label { display:none; }
  }
  @media(max-width:560px) {
    .calibration-options { padding-top:42px; }.reference-cards { grid-template-columns:1fr; margin-top:22px; }.reference-cards article { padding:22px; }.reference-cards .object-illustration { float:left; }.dialog-heading h2 { font-size:25px; }
    .wrap { width:calc(100% - 32px); }.site-header { padding-block:17px; }.site-header nav { gap:17px; font-size:12px; }.brand { font-size:25px; }.brand img { width:30px; height:30px; }
    .hero { padding:31px 0 28px; }.hero .eyebrow { font-size:9px; letter-spacing:1.5px; } h1 { font-size:55px; letter-spacing:-2.7px; line-height:1.02; margin:16px 0 20px; }.mobile-break { display:block; }.desktop-break { display:none; }
    .hero-description { font-size:15px; max-width:335px; margin:auto; }.hero-note { font-size:10px; margin-top:15px; }
    .measure-card { width:100%; border-radius:0; border-inline:0; box-shadow:none; }
    .calibration-banner { align-items:stretch; gap:12px; padding:16px; }.calibration-banner>div { flex:1; }.calibration-banner strong { font-size:12px; }.calibration-banner p { font-size:11px; }.calibration-banner .button { width:108px; padding:9px 12px; font-size:12px; gap:5px; }.calibration-banner .button span { display:none; }
    .tool-heading { padding:20px 16px 15px; gap:12px; align-items:flex-start; }.reading { gap:8px; }.reading output { font-size:35px; }.reading>span { font-size:13px; }.state-label { font-size:10px; max-width:115px; text-align:center; padding:7px 8px; }
    .toolbar { gap:8px; padding:0 16px 12px; }.segmented button { padding:6px 10px; min-width:40px; }.snap { font-size:11px; gap:5px; }.snap input { width:16px; height:16px; }.ruler-instruction { margin:0 16px 10px; font-size:11px; }
    .tool-footer { padding:15px 16px 8px; gap:12px; }.division-picker { width:100%; justify-content:space-between; }.division-picker select { flex:1; max-width:200px; }.actions { width:100%; }.actions .button { flex:1; }.actions .text-button { padding-inline:16px; }
    .calibration-footnote { padding-inline:16px; }.feedback { padding-inline:16px; }.trust-strip { gap:9px 15px; font-size:10px; padding-top:18px; }
    .guide { display:block; padding:58px 0 45px; }.section-intro { margin-bottom:32px; }.section-intro p:last-child { max-width:100%; font-size:15px; }.steps li { gap:20px; } h3 { font-size:19px; }
    .reference-section { display:block; padding:40px 0; }.conversion-card { margin-top:26px; padding:15px 23px; }.conversion-card strong { font-size:21px; }
    .app-section { padding:30px 25px; display:flex; flex-direction:column; gap:30px; margin-block:8px 55px; }.app-art { flex-direction:row; gap:30px; justify-content:flex-start; }.app-icon { width:90px; height:90px; border-radius:22px; flex-shrink:0; }.app-icon span { top:43px; font-size:21px; }.app-icon i { height:20px; width:1.5px; }.app-icon i:nth-of-type(3n) { height:33px; }.app-art-label { font-size:20px; text-align:left; }.app-section h2 { font-size:33px; }
    .faq { display:block; padding-bottom:40px; }.faq-items { margin-top:28px; }.faq h2 { font-size:32px; }.site-footer { flex-wrap:wrap; gap:15px; }.site-footer p { order:3; flex-basis:100%; }.site-footer>a:last-child { margin-left:auto; }
    dialog { padding:20px; } dialog h2 { font-size:28px; }
  }
  @media(prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } }
  @media(prefers-contrast:more) { :root { --muted:#253b2c; --line:#687661; }.state-label { border-color:#66765d; }.selection { background:#ffffff60; }.handle { border-color:white; } }
  @media(forced-colors:active) { .ruler-viewport,#ticks { forced-color-adjust:none; }.handle { forced-color-adjust:auto; }.selection { outline:1px solid CanvasText; } }
  @media print { .site-header,.hero,.toolbar,.tool-footer,.guide,.reference-section,.app-section,.faq,.site-footer,.trust-strip { display:none; }.measure-card::before { content:"Screen calibration does not apply to printing. Do not use this printout as a physical ruler."; display:block; padding:24px; font-weight:bold; }.measure-card { width:100%; border:1px solid black; }.ruler-viewport { display:none; } }
}