:root{color-scheme:light dark;--bg:#f7f6f2;--paper:#fff;--ink:#203732;--muted:#5b6c64;--line:#dfe5df;--accent:#14665e;--soft:#edf2ec;--gold:#98743f;--deep:#123f39}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:32px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--accent);text-underline-offset:4px}a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:5px}h1,h2,h3{line-height:1.18;letter-spacing:-.035em;font-weight:650;text-wrap:balance}h1{font-size:clamp(2.4rem,4.6vw,4.7rem);max-width:900px;margin:20px 0 24px}h2{font-size:clamp(1.3rem,2vw,1.8rem);margin:0 0 20px}p{margin:0 0 20px}li{margin-block-end:12px}img{max-width:100%}.site-header,main,footer{width:min(1200px,calc(100% - 80px));margin-inline:auto}.site-header{display:flex;align-items:center;gap:30px;min-height:96px;padding-block:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:1.08rem;text-decoration:none;color:var(--ink);line-height:1.3}.brand img{border-radius:11px}.site-header nav{display:flex;justify-content:center;gap:6px;flex:1;font-size:14px}.site-header nav a{padding:8px 12px;border-radius:8px;text-decoration:none;white-space:nowrap;color:var(--muted)}.site-header nav a:hover,.site-header nav a[aria-current]{background:var(--soft);color:var(--accent)}.site-header nav a[aria-current]{font-weight:700}.site-language{max-width:220px}.language-control label{position:absolute;width:1px;height:1px;clip-path:inset(50%);overflow:hidden;white-space:nowrap}.language-control[hidden],.language-fallback[hidden]{display:none!important}select{font:inherit;font-size:13px;background:var(--paper);color:var(--ink);padding:10px 12px;border:1px solid var(--line);border-radius:9px;max-width:100%}.language-links{display:flex;flex-wrap:wrap;gap:12px 20px;padding-top:16px}.hero{padding:72px 0 36px}.hero-home{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:70px;padding-block:80px 48px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0}.eyebrow span{margin-inline:12px;color:var(--gold)}.intro{max-width:760px;color:var(--muted);font-size:1.08rem;line-height:1.8}.hero-home .intro{font-size:1rem}.hero-tools{background:var(--deep);padding:14px 28px;border-radius:22px;box-shadow:0 24px 60px #163b3020}.quick-tool{display:flex;align-items:center;gap:18px;min-height:80px;padding-block:16px;color:#f1f4e9;border-bottom:1px solid #ffffff20;text-decoration:none;font-size:16px;font-weight:550}.quick-tool:last-child{border-bottom:0}.tool-symbol{display:grid;place-items:center;flex:0 0 44px;width:44px;height:44px;border:1px solid #ffffff30;border-radius:12px;color:#d8c69b;font-size:28px;line-height:1}.tool-arrow{margin-inline-start:auto;font-size:22px;color:#b2d5c3}.quick-tool:hover .tool-arrow{transform:translateY(-2px)}.tool-launch{display:flex;align-items:center;justify-content:space-between;gap:32px;background:var(--paper);border:1px solid var(--line);border-inline-start:3px solid var(--accent);border-radius:12px;padding:26px 32px;margin:16px 0 64px}.tool-launch h2{font-size:1.2rem;margin:0 0 8px}.tool-launch p{max-width:620px;color:var(--muted);font-size:14px;margin:0}.launch-controls{flex-shrink:0;max-width:45%}.button{display:inline-flex;justify-content:center;align-items:center;gap:16px;padding:13px 23px;background:var(--accent);color:#fff;border-radius:9px;font-size:14px;font-weight:650;text-decoration:none;min-height:48px}.button:hover{filter:brightness(1.1)}.reading-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:70px;padding-block:8px 40px}.contents{align-self:start;position:sticky;top:32px;border-top:1px solid var(--line);padding-top:12px}.contents a{display:flex;align-items:baseline;gap:16px;padding-block:12px;color:var(--muted);font-size:13px;line-height:1.6;text-decoration:none}.contents a:hover{color:var(--accent)}.contents span{font-size:11px;font-variant-numeric:tabular-nums;color:var(--gold)}article{min-width:0;max-width:780px}article section{padding:0 0 30px;margin:0 0 36px;border-bottom:1px solid var(--line)}article p,article li{color:var(--muted);font-size:16px}article p:last-child{margin-bottom:0}.references{font-size:14px}.related{border-top:1px solid var(--line);padding-top:40px;margin:12px 0 72px}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:16px}.related-card{display:flex;flex-direction:column;gap:12px;padding:26px;background:var(--paper);border:1px solid var(--line);border-radius:12px;text-decoration:none;transition:border-color .15s,transform .15s}.related-card strong{font-size:17px;font-weight:650}.related-card:hover{border-color:var(--accent);transform:translateY(-2px)}.related-card span{font-size:14px;line-height:1.7;color:var(--muted)}footer{border-top:1px solid var(--line);padding:36px 0 28px;font-size:13px;color:var(--muted)}footer nav{display:flex;flex-wrap:wrap;gap:12px 24px;margin:20px 0}footer a{text-decoration:none}footer .brand{font-size:18px}.skip-link{position:absolute;inset-inline-start:16px;top:-80px;background:var(--paper);padding:12px;z-index:10}.skip-link:focus{top:8px}summary{cursor:pointer}
[dir=rtl] h1,[dir=rtl] h2,[dir=rtl] .eyebrow{letter-spacing:normal}[dir=rtl] .tool-arrow{transform:scaleX(-1)}
@media(max-width:1050px){.site-header,main,footer{width:calc(100% - 48px)}.site-header{flex-wrap:wrap;gap:14px 24px}.site-header nav{order:3;flex-basis:100%;justify-content:flex-start;overflow:auto}.site-language{margin-inline-start:auto}.hero-home{gap:32px}.reading-layout{grid-template-columns:210px minmax(0,1fr);gap:36px}.quick-tool{font-size:14px}.hero-tools{padding-inline:20px}}
@media(max-width:700px){.site-header,main,footer{width:calc(100% - 36px)}.site-header{min-height:0;padding-block:18px 12px}.brand{font-size:15px;max-width:60%}.brand img{width:32px;height:32px}.site-language{max-width:36%}.site-header nav{gap:0}.site-header nav a{font-size:13px;padding:8px 10px}.hero{padding-block:40px 16px}.hero-home{grid-template-columns:1fr;gap:16px}.hero-home h1{max-width:520px}.hero-tools{box-shadow:none;padding-inline:22px}.quick-tool{min-height:70px;font-size:15px}.intro{font-size:1rem}.eyebrow{font-size:10px}.tool-launch{align-items:stretch;flex-direction:column;gap:20px;padding:22px;margin-bottom:40px}.launch-controls{max-width:none}.button{width:100%}.reading-layout{display:block;padding-bottom:8px}.contents{position:static;margin-bottom:36px;display:none}.related{margin-bottom:40px}h1{font-size:2.5rem}.related-card{padding:22px}}
@media(prefers-color-scheme:dark){:root{--bg:#101c1b;--paper:#192826;--ink:#e6eeea;--muted:#b4c5bd;--line:#344743;--accent:#9bd5c7;--soft:#243b35;--gold:#dfc18d;--deep:#163c35}.button{color:#103d35}.hero-tools{box-shadow:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}

/* A quiet, in-flow invitation; never an overlay or a prerequisite to a tool. */
.mobile-app-promo{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:20px 32px;padding-bottom:28px;margin-bottom:28px;border-bottom:1px solid var(--line)}
.mobile-app-copy{flex:1 1 360px;max-width:620px;min-width:0}
.mobile-app-copy h2{font-size:1.35rem;color:var(--ink);margin:0 0 12px}
.mobile-app-copy p{font-size:15px;margin:0;line-height:1.7}
.store-links{display:flex;align-items:center;flex-wrap:wrap;gap:0 8px;max-width:100%}
.store-link{display:inline-flex;align-items:center;border-radius:8px;max-width:100%}
.store-link img{display:block;object-fit:contain;width:auto}
.apple-store{padding:12px}
.apple-store img{height:48px}
.google-store img{height:72px}

/* The public page owns navigation and editorial content; the same-origin frame
   reuses our existing calculators without a second calculation implementation. */
.publisher{font-size:13px;color:var(--muted)}
.inline-tool{border:1px solid var(--line);border-radius:16px;background:var(--paper);margin:12px 0 48px;overflow:hidden}
.inline-tool .tool-launch{margin:0;border:0;border-radius:0;border-bottom:1px solid var(--line)}
.inline-tool iframe{display:block;width:100%;height:720px;border:0;background:var(--bg)}
.table-scroll{max-width:100%;overflow-x:auto;margin-block:20px;overscroll-behavior-inline:contain}
table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
caption{font-weight:650;text-align:start;margin-bottom:12px;color:var(--ink)}
th,td{text-align:start;padding:12px 10px;border:1px solid var(--line);vertical-align:top}
th{background:var(--soft);font-weight:650}td{background:var(--paper)}
.resource-controls{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-block:20px}
.resource-controls[hidden],.print-month[hidden]{display:none}
.resource-controls button{font:inherit;line-height:1.6;white-space:normal;border:1px solid var(--accent);border-radius:8px;padding:10px 18px;background:var(--accent);color:var(--paper);cursor:pointer}
button:focus-visible,.table-scroll:focus-visible,iframe:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.print-month{margin-block:24px}.dual-month{table-layout:fixed}.dual-month th,.dual-month td{text-align:center;padding:8px 2px}
.dual-month th{overflow-wrap:anywhere}
.dual-month strong{display:block;font-size:18px}.dual-month small{display:block;font-size:11px;line-height:1.8}.print-source{font-size:12px}
@media(max-width:700px){.inline-tool iframe{height:800px}.inline-tool .tool-launch{padding:18px}.dual-month small{font-size:10px}.dual-month th{font-size:11px}.table-scroll{margin-inline:0}}
@media(prefers-color-scheme:dark){.resource-controls button{color:var(--bg)}}
@media print{
  :root{--bg:white;--paper:white;--ink:black;--muted:#333;--line:#999;--soft:#eee}
  .site-header,.skip-link,.hero-tools,.inline-tool,.contents,.related,footer,.resource-controls{display:none!important}
  main{width:100%;margin:0}.reading-layout{display:block}article{max-width:none}.hero{padding:0}h1{font-size:24pt}
  .print-month{break-inside:avoid;page-break-inside:avoid}th,td{padding:8px}.table-scroll{overflow:visible}
  body.print-calendar-only .hero,body.print-calendar-only article>section:not(.calendar-resource){display:none!important}
  .calendar-resource{border:0;margin:0;padding:0}a{color:black}
  body.print-calendar-only .reading-layout{padding:0}
  body.print-calendar-only .calendar-resource{font-size:11pt;line-height:1.5}
  body.print-calendar-only .calendar-resource h2{font-size:18pt;margin-bottom:12px}
  body.print-calendar-only .calendar-resource p{font-size:10pt;margin-bottom:10px}
  body.print-calendar-only .print-month{margin-block:12px}
}