styles.css

@layer reset, base, layout, components, responsive, print;
@layer reset {
  *,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:34px}body{margin:0}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}svg{display:block;max-width:100%}img{max-width:100%}button:disabled{cursor:default}h1,h2,h3,p{margin-top:0}a{color:inherit}button{color:inherit}
}
@layer base {
  :root{--paper:#f8f7f1;--panel:#fffef9;--sage:#eef1e8;--ink:#243e36;--body:#34443e;--muted:#69766d;--line:#d9dfd3;--green:#3f6854;--gold:#a4722b;--sun:#e6ad43;--orange:#c27442;--blue:#6f8c9a;--red:#a94b3a;--sidebar:224px}
  body{background:var(--paper);color:var(--body);font-family:"Avenir Next",Avenir,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.7}h1,h2,h3{color:var(--ink);line-height:1.14;font-weight:500}h1,h2{font-family:Georgia,"Times New Roman",serif;letter-spacing:-.045em}h1{font-size:clamp(54px,5.8vw,88px);margin-bottom:18px}h2{font-size:clamp(34px,3.3vw,47px);margin-bottom:0}h3{font-size:20px;letter-spacing:-.02em;line-height:1.4;margin-bottom:12px}p{margin-bottom:20px}strong{font-weight:650;color:var(--ink)}a{text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:var(--gold)}:focus-visible{outline:3px solid var(--gold);outline-offset:5px;border-radius:3px}button{border:0;background:none}button:hover{color:var(--gold)}select,input[type=date],input[type=time]{width:100%;background:var(--panel);border:1px solid #bdc8ba;border-radius:4px;padding:10px 12px;min-height:44px;color:var(--ink)}input[type=range]{display:block;width:100%;height:22px;margin:6px 0 0;accent-color:var(--green);cursor:pointer}input[type=checkbox],input[type=radio]{accent-color:var(--green);width:18px;height:18px;flex-shrink:0}label{color:var(--ink)}::selection{background:#e7d6ad;color:var(--ink)}
  .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;left:20px;z-index:100;background:var(--ink);color:white;padding:10px 20px}.skip-link:focus{top:10px}
}
@layer layout {
  .sidebar{width:var(--sidebar);position:fixed;inset:0 auto 0 0;padding:34px 25px 24px;background:#efeee5;border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:20;overflow-y:auto}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:29px;font-weight:650;line-height:1.05}.brand-sub{display:block;font-size:8px;letter-spacing:.13em;margin-top:7px}.sidebar-intro{font-size:12px;line-height:1.65;color:var(--muted);margin:24px 0 42px}.chapter-label{font-size:9px;letter-spacing:.15em;color:var(--muted);font-weight:650}.chapter-link{display:flex;justify-content:space-between;text-decoration:none;font-size:14px;font-weight:650;margin:8px 0 27px;color:var(--ink)}.sidebar nav{display:flex;flex-direction:column;gap:3px}.sidebar nav a{display:flex;gap:12px;padding:9px 0;font-size:12px;text-decoration:none;color:var(--muted);line-height:1.3;position:relative}.sidebar nav a span{font-size:10px;min-width:16px;opacity:.6}.sidebar nav a.active{color:var(--ink);font-weight:650}.sidebar nav a.active::before{position:absolute;content:"";left:-25px;top:6px;bottom:6px;width:3px;background:var(--green)}.sidebar-bottom{margin-top:auto;padding-top:36px}.reading-label{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);margin-bottom:7px}.progress-track{height:3px;background:#d8ddce;border-radius:2px;overflow:hidden}#reading-progress{width:0;height:100%;background:var(--green)}.sidebar-bottom>a{display:block;font-size:11px;text-decoration:none;margin-top:20px}.sidebar-bottom>a span{float:right}.sidebar-bottom p{font-size:10px;line-height:1.6;margin:22px 0 0;color:var(--muted)}
  main{max-width:1536px;margin-left:var(--sidebar);padding:0 clamp(28px,4vw,70px)}.hero{padding:30px 0 0}.topline{display:flex;justify-content:space-between;font-size:9px;letter-spacing:.13em;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:21px;margin-bottom:46px}.hero-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.eyebrow{font-size:10px;letter-spacing:.14em;font-weight:600;color:var(--muted);margin-bottom:14px}.title-dot{color:var(--gold)}.chapter-symbol{width:90px;flex-shrink:0;align-self:flex-start;padding-top:8px}.chapter-symbol svg{stroke:var(--gold);fill:none;stroke-width:1.3}.hero-lead{font-family:Georgia,serif;font-size:clamp(21px,2vw,28px);line-height:1.5;max-width:780px;color:var(--ink);letter-spacing:-.02em;margin-bottom:21px}.hero-bottom{display:flex;justify-content:space-between;align-items:flex-start;gap:30px;padding-bottom:35px}.hero-bottom p{font-size:13px;max-width:510px;margin-bottom:0;color:var(--muted)}.hero-bottom .text-link{flex-shrink:0;margin-top:4px}.reader-section{border-top:1px solid var(--line);padding:51px 0 58px;scroll-margin-top:15px}.section-heading{display:flex;gap:24px;align-items:flex-start;margin-bottom:25px}.section-number{font-family:Georgia,serif;font-size:20px;line-height:1.5;color:var(--gold);padding-top:14px}.section-heading .eyebrow{margin-bottom:9px}.section-lead{font-size:18px;line-height:1.7;max-width:800px;color:var(--body);margin-bottom:27px}.measure{max-width:790px}.reading-grid{display:grid;grid-template-columns:1fr 1fr;gap:42px;margin-top:29px}.reading-grid p{font-size:14px;margin-bottom:8px}.mobile-bar{display:none}.text-link{font-size:12px;font-weight:600;text-decoration:none;color:var(--green)}.text-link span{padding-left:15px}
}
@layer components {
  .lab{display:grid;grid-template-columns:minmax(0,1fr) 280px;border:1px solid var(--line);border-radius:8px;background:var(--panel);overflow:hidden;margin-top:27px}.lab-canvas{background:var(--sage);min-width:0;padding:20px 22px 13px;display:flex;flex-direction:column;justify-content:space-between}.lab-canvas>svg{width:100%;height:auto}.canvas-heading,.canvas-footer{display:flex;justify-content:space-between;align-items:center;gap:12px}.small-label,.control-kicker{font-size:9px;letter-spacing:.1em;color:var(--muted);font-weight:650;line-height:1.5}.canvas-footer{font-size:10px;color:var(--muted);padding-top:12px}.live-pill{font-size:9px;color:var(--green);display:flex;gap:6px;align-items:center;white-space:nowrap}.live-pill i{width:5px;height:5px;background:var(--green);border-radius:50%}.lab-controls{padding:23px 23px 22px;border-left:1px solid var(--line);font-size:12px;line-height:1.65}.lab-controls .control-kicker{margin-bottom:22px}.lab-controls>label:not(.check-label){display:block;font-size:11px;font-weight:600;margin-bottom:7px}.lab-controls select{font-size:12px;padding:9px 8px;min-height:39px;margin-bottom:12px}.control-row{display:flex;justify-content:space-between;align-items:center;font-size:11px;font-weight:600;margin-top:15px;gap:8px}.control-row output{color:var(--green);font-variant-numeric:tabular-nums;white-space:nowrap}.range-labels{display:flex;justify-content:space-between;font-size:8px;color:var(--muted);padding:0 2px;margin-bottom:4px}.segmented{display:flex;gap:4px;align-items:stretch}.segmented button{flex:1;font-size:10px;line-height:1.4;padding:9px 4px;border:1px solid var(--line);border-radius:3px;min-height:34px;background:var(--panel);transition:background .15s}.segmented button[aria-pressed=true],.segmented button:hover{background:#e5eadc;color:var(--ink);border-color:#a9b99e}.season-buttons{margin-top:12px;margin-bottom:5px}.button{display:inline-flex;align-items:center;justify-content:center;gap:14px;border-radius:4px;background:var(--ink);color:#fffef7;padding:12px 19px;font-size:12px;line-height:1.5;font-weight:600;text-decoration:none;min-height:44px;transition:background .15s}.button:hover{background:var(--green);color:#fffef7}.play-button{width:100%;margin-top:17px}.control-note{font-size:10px;line-height:1.7;color:var(--muted);margin:14px 0 0}.control-note strong{font-weight:600}.quiet-button{font-size:10px;text-decoration:none;padding:3px 0;line-height:1.5}.metric-strip{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);padding:21px 0 23px}.metric-strip>div{padding:0 24px;border-right:1px solid var(--line)}.metric-strip>div:last-child{border:0}.metric-strip span{display:block;font-size:8px;letter-spacing:.12em;font-weight:600;color:var(--muted)}.metric-strip strong{display:block;font-family:Georgia,serif;font-size:32px;font-weight:400;line-height:1.4;letter-spacing:-.035em;font-variant-numeric:tabular-nums}.metric-strip small{display:block;font-size:9px;color:var(--muted);line-height:1.5}.try-it,.design-note{display:grid;grid-template-columns:88px 1fr;gap:20px;border-top:1px solid var(--line);padding-top:22px;margin-top:27px}.try-it>span,.design-note>span{font-size:9px;letter-spacing:.1em;color:var(--gold);font-weight:700;padding-top:4px}.try-it p,.design-note p{font-size:14px;margin-bottom:0;max-width:760px}.design-note>span{color:var(--green)}.season-panel{margin:25px 0;background:var(--sage);border:1px solid var(--line);border-radius:7px;padding:22px 25px}.season-panel>svg{width:100%}.season-comparison{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;border-top:1px solid var(--line);padding-top:16px}.season-comparison>div{display:flex;flex-direction:column;gap:3px}.season-comparison>div>span{font-size:10px;font-weight:650}.season-comparison strong{font-family:Georgia,serif;font-size:28px;font-weight:400;line-height:1.3}.season-comparison small{font-size:10px;color:var(--muted)}.formula{font-family:Georgia,serif;font-size:21px;line-height:1.6;color:var(--green);margin:22px 0;overflow-wrap:anywhere}.reference{font-size:10px;vertical-align:super;text-decoration:none;color:var(--gold);padding-left:3px}.clock-lab{display:grid;grid-template-columns:1.15fr 1fr;gap:40px;border:1px solid var(--line);border-radius:7px;background:var(--panel);padding:28px 32px;margin:28px 0}.clock-inputs{display:grid;grid-template-columns:1fr 1fr;gap:15px}.clock-inputs label{display:block;font-size:12px;margin-bottom:6px}.clock-inputs input{font-size:14px}.check-label{display:flex;align-items:center;gap:9px;font-size:11px;line-height:1.6;margin:15px 0}.clock-result{display:flex;flex-direction:column;justify-content:center;padding-left:25px;border-left:1px solid var(--line)}.clock-result>strong{font-family:Georgia,serif;font-size:63px;font-weight:400;line-height:1.25;letter-spacing:-.04em;font-variant-numeric:tabular-nums}.clock-result>span:not(.small-label){font-size:11px;color:var(--green)}.clock-breakdown{display:flex;gap:10px;font-size:9px;color:var(--muted);margin-top:15px;flex-wrap:wrap}.math-details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0;margin-top:28px}.math-details summary{font-size:12px;font-weight:600;color:var(--green);cursor:pointer}.math-details[open] summary{margin-bottom:15px}.math-details p{font-size:13px;max-width:790px;margin-bottom:14px}.math-details p.formula{font-size:18px}.large-result{margin-top:24px;padding-top:18px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:4px}.large-result strong{font-family:Georgia,serif;font-size:43px;line-height:1.2;font-weight:400;letter-spacing:-.04em}.large-result>span{font-size:11px;color:var(--muted);line-height:1.6}.small-metrics{margin-top:19px;margin-bottom:0;font-size:11px}.small-metrics>div{display:flex;justify-content:space-between;gap:12px;margin:8px 0}.small-metrics dt{color:var(--muted)}.small-metrics dd{margin:0;color:var(--ink);font-variant-numeric:tabular-nums}.preset-label{margin-top:25px;margin-bottom:9px}.path-key{display:flex;flex-direction:column;gap:10px;margin:25px 0;font-size:10px;color:var(--muted)}.path-key>span{display:flex;align-items:center;gap:10px}.key-line{width:20px;height:0;border-top:2px solid}.june{color:var(--gold)}.march{color:var(--green)}.december{color:var(--blue)}.key-mask{width:20px;height:10px;background:#c5cbbd;border:1px solid #96a28a}.status-message{font-size:13px;font-weight:600;line-height:1.6;color:var(--green)}.status-message.blocked{color:var(--red)}.reading-steps{font-size:14px;margin:29px 0 0;padding-left:22px;max-width:800px}.reading-steps li{padding-left:7px;margin-bottom:12px}.massing-checks{grid-column:1/-1;display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line)}.massing-checks>div{display:flex;flex-direction:column;align-items:center;padding:14px 7px 16px;border-right:1px solid var(--line);gap:3px;font-size:10px}.massing-checks>div:last-child{border:0}.massing-checks strong{font-size:11px;font-variant-numeric:tabular-nums}.massing-checks span{color:var(--red)}.massing-checks .clear span{color:var(--green)}.caption{font-size:11px;line-height:1.8;color:var(--muted);margin-top:15px;max-width:850px}.quiz-section{padding-bottom:50px}.quiz-question{border:0;border-top:1px solid var(--line);padding:24px 0 25px;margin:0;min-width:0}.quiz-question legend{float:left;width:100%;font-size:16px;font-weight:600;line-height:1.65;color:var(--ink);margin-bottom:13px;padding:0}.quiz-question legend span{font-size:11px;color:var(--gold);padding-right:13px}.quiz-options{clear:both;display:grid;grid-template-columns:1fr 1fr;gap:8px 12px}.quiz-option{display:flex;align-items:center;gap:11px;border:1px solid var(--line);border-radius:4px;padding:10px 13px;font-size:12px;line-height:1.6;cursor:pointer;background:var(--panel)}.quiz-option:has(input:checked){border-color:var(--green);background:#eef2e8}.quiz-feedback{clear:both;margin:13px 0 0;font-size:12px;color:var(--green);display:none}.quiz-feedback:not(:empty){display:block}.quiz-feedback.incorrect{color:var(--red)}.quiz-actions{display:flex;align-items:center;gap:23px;border-top:1px solid var(--line);padding-top:25px}.quiz-actions .quiet-button{font-size:12px}.quiz-actions>p{font-size:13px;margin:0 0 0 auto;font-weight:600;color:var(--green)}.button-outline{color:var(--green);border:1px solid var(--green);background:transparent;white-space:nowrap;margin-top:8px}.button-outline:hover{background:var(--green);color:white}.references-section{padding-bottom:20px}.references-section>h2{margin-bottom:23px;font-size:37px}.references-section>p:not(.eyebrow){max-width:800px;font-size:13px}.source-list{padding-left:20px;font-size:12px;margin:26px 0}.source-list li{padding-left:8px;margin-bottom:16px}.source-list span{display:block;color:var(--muted);font-size:11px}.source-list a{text-decoration:none;color:var(--green);font-weight:600}.reader-end{display:flex;justify-content:space-between;padding-top:30px;margin-top:40px;border-top:1px solid var(--line);font-size:9px;letter-spacing:.07em;color:var(--muted)}.reader-end a{text-decoration:none}.notice{padding:20px;border:1px solid var(--line)}
}
@layer components {
  .author-profile{display:grid;grid-template-columns:180px minmax(0,1fr);gap:32px;align-items:start;margin-top:29px;max-width:900px}.author-portrait{display:block;width:180px;height:180px;object-fit:cover;border:1px solid var(--line);border-radius:7px}.author-bio h3{font-family:Georgia,"Times New Roman",serif;font-size:31px;font-weight:400;line-height:1.2;margin-bottom:8px}.author-bio .author-role{font-size:12px;color:var(--muted);margin-bottom:20px}.author-bio p{font-size:14px;margin-bottom:16px}.author-bio .text-link{display:inline-block;margin-top:3px}
}
@layer responsive {
  @media(max-width:650px){.author-profile{grid-template-columns:1fr;gap:21px;margin-top:24px}.author-portrait{width:128px;height:128px}.author-bio h3{font-size:28px}.author-bio .author-role{font-size:11px}.author-bio p{font-size:13px}}
  .path-time-controls{display:grid;grid-template-columns:230px 1fr;gap:30px;margin-top:18px;align-items:center}.path-time-controls .control-row{margin-top:0}
  @media(min-width:1700px){main{margin-right:auto}.lab{grid-template-columns:minmax(0,1fr) 300px}}
  @media(max-width:1150px){:root{--sidebar:200px}.sidebar{padding-left:21px;padding-right:21px}.sidebar nav a.active::before{left:-21px}main{padding-left:30px;padding-right:30px}.lab{grid-template-columns:minmax(0,1fr) 245px}.lab-controls{padding:20px 17px}.lab-canvas{padding:17px 15px 12px}.metric-strip>div{padding:0 16px}.chapter-symbol{width:70px}.topline{font-size:8px}.section-heading{gap:17px}.hero-bottom{gap:20px}.hero-bottom p{max-width:410px}.clock-lab{gap:20px;padding:24px}.reading-grid{gap:25px}.canvas-heading .small-label{font-size:8px}}
  @media(max-width:900px){:root{--sidebar:224px}html{scroll-padding-top:78px}.mobile-bar{display:flex;position:sticky;top:0;z-index:30;justify-content:space-between;align-items:center;padding:13px 23px;border-bottom:1px solid var(--line);background:var(--paper)}.wordmark{font-weight:700;font-size:22px;line-height:1;text-decoration:none;color:var(--ink)}.wordmark span{font-size:11px;font-weight:400;margin-left:8px}.mobile-bar button{font-size:12px}.mobile-bar button span{margin-left:10px}.sidebar{top:56px;transform:translateX(-100%);transition:transform .2s}.sidebar.open{transform:translateX(0);box-shadow:10px 0 40px #243e3620}main{margin-left:0;padding-left:30px;padding-right:30px;max-width:1000px}.reader-section{scroll-margin-top:65px}.topline{margin-bottom:33px}.hero{padding-top:22px}.sidebar-intro{margin-bottom:25px}.brand{font-size:26px}.sidebar-bottom{padding-top:25px}.lab{grid-template-columns:minmax(0,1fr) 260px}}
  @media(max-width:650px){main{padding:0 20px}.hero{padding-top:18px}.topline{font-size:8px;letter-spacing:.06em;margin-bottom:29px}.topline>span:last-child{display:none}.hero h1{font-size:54px}.hero-heading{gap:5px}.hero .eyebrow{font-size:8px;letter-spacing:.1em}.chapter-symbol{width:57px;padding-top:12px}.hero-lead{font-size:23px}.hero-bottom{display:block}.hero-bottom p{font-size:12px;margin-bottom:20px}.reader-section{padding-top:36px;padding-bottom:40px}.section-heading{gap:14px;margin-bottom:21px}.section-heading .eyebrow{font-size:8px}.section-number{font-size:17px;padding-top:11px}h2{font-size:35px}.section-lead{font-size:16px}.lab{grid-template-columns:1fr;margin-top:23px}.lab-canvas{padding:17px 15px 12px}.lab-controls{border-left:0;border-top:1px solid var(--line);padding:22px}.sun-lab .lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.sun-lab .lab-controls>*{grid-column:1/-1}.lab-controls .control-kicker{margin-bottom:13px}.lab-controls>label:not(.check-label),.control-row{font-size:12px}.lab-controls select{font-size:13px}.control-note{font-size:11px}.canvas-heading .small-label{font-size:8px}.metric-strip{grid-template-columns:1fr 1fr;padding:0}.metric-strip>div{padding:16px 20px;border-bottom:1px solid var(--line)}.metric-strip>div:nth-child(2){border-right:0}.metric-strip>div:nth-child(n+3){border-bottom:0}.metric-strip>div:last-child{border-left:1px solid var(--line)}.metric-strip strong{font-size:32px}.metric-strip small{font-size:9px}.metric-strip span{font-size:8px}.reading-grid{grid-template-columns:1fr;gap:20px;margin-top:24px}.reading-grid p{font-size:14px}.reading-grid h3{font-size:19px;margin-bottom:8px}.try-it,.design-note{grid-template-columns:1fr;gap:8px;margin-top:22px}.try-it p,.design-note p{font-size:13px}.clock-lab{grid-template-columns:1fr;padding:24px;gap:22px}.clock-result{border-left:0;border-top:1px solid var(--line);padding:20px 0 0}.clock-result>strong{font-size:57px}.clock-inputs{gap:12px}.clock-inputs input{padding:9px 6px;font-size:13px}.check-label{font-size:12px}.season-panel{padding:18px 13px}.season-comparison>div>span{font-size:9px}.season-comparison strong{font-size:25px}.season-comparison small{font-size:8px}.formula{font-size:19px}.large-result strong{font-size:40px}.path-key{display:grid;grid-template-columns:1fr 1fr;gap:10px}.massing-checks>div{font-size:8px;padding:12px 3px}.massing-checks strong{font-size:10px}.quiz-options{grid-template-columns:1fr}.quiz-question legend{font-size:15px}.quiz-option{font-size:12px}.quiz-actions{flex-wrap:wrap;gap:17px}.quiz-actions>p{width:100%;margin-left:0}.reader-end{gap:20px;font-size:8px}.references-section>h2{font-size:32px}}
  @media(max-width:650px){.path-time-controls{grid-template-columns:1fr;gap:17px}}
  @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
}
@layer print {
  @media print{html{scroll-behavior:auto}body{background:#fff;color:#111;font-size:10pt;line-height:1.5}.sidebar,.mobile-bar,.skip-link,.button,.quiet-button,.reader-end,.source-list{display:none!important}main{margin:0;padding:0;max-width:none}.reader-section{padding:15px 0;break-before:auto}.hero{padding:0}.topline{margin-bottom:15px}.chapter-symbol{display:none}.lab{break-inside:avoid;grid-template-columns:1fr 200px}.lab-controls{font-size:9pt}.lab-canvas{background:#f3f4ef!important;print-color-adjust:exact}.try-it,.design-note{break-inside:avoid}.hero h1{font-size:36pt}h2{font-size:25pt}h3{break-after:avoid;font-size:14pt}.measure{orphans:3;widows:3}.section-lead{font-size:13pt}.section-number{font-size:16pt}.quiz-feedback{display:block!important}@page{size:A4 portrait;margin:16mm}}
}