/* Baseline theme. Structure-only styling meant to be replaced by a site-specific design.
   All colors/typography are tokens on :root. Uses logical properties so RTL works. */
:root {
  --c-primary: #1f3a5f;
  --c-secondary: #3c7a89;
  --c-accent: #e0a458;
  --c-soft: #c9d6df;
  --c-bg: #f7f9fb;
  --c-surface: #ffffff;
  --c-text: #1b2733;
  --c-muted: #5b6b7a;
  --font-body: system-ui, -apple-system, "Segoe UI", "Noto Sans", "Noto Sans JP", "Noto Sans TC", "Noto Sans Arabic", sans-serif;
  --font-head: var(--font-body);
  --radius: 10px;
  --wrap: 1160px;
  --gap: clamp(16px, 3vw, 28px);
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--c-bg); color: var(--c-text); font: 17px/1.7 var(--font-body); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.25; color: var(--c-text); }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); margin: .2em 0 .4em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); margin: 2em 0 .6em; }
h3 { font-size: 1.15rem; margin: 1.4em 0 .4em; }
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 16px; }
.skip-link { position: absolute; inset-inline-start: -999px; top: 8px; background: var(--c-surface); padding: 8px 12px; z-index: 10; }
.skip-link:focus { inset-inline-start: 8px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* header */
.site-header { background: var(--c-surface); border-bottom: 1px solid var(--c-soft); position: sticky; top: 0; z-index: 5; }
.header-inner { display: flex; align-items: center; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--c-text); font-weight: 700; font-size: 1.1rem; }
.nav-toggle { margin-inline-start: auto; display: none; background: none; border: 1px solid var(--c-soft); border-radius: var(--radius); padding: 6px 12px; font: inherit; cursor: pointer; }
.site-nav { margin-inline-start: auto; }
.site-nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0; padding: 0; }
.site-nav a { text-decoration: none; color: var(--c-text); font-size: .95rem; padding: 6px 0; display: inline-block; }
.site-nav a[aria-current="page"] { color: var(--c-primary); box-shadow: inset 0 -2px 0 var(--c-accent); }
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; width: 100%; margin: 0; }
  .nav-open .site-nav { display: block; }
  .site-nav ul { flex-direction: column; padding-bottom: 12px; }
}

/* layout pieces */
main { padding-block: 24px 64px; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0 0 12px; font-size: .88rem; color: var(--c-muted); }
.breadcrumb li + li::before { content: "/"; margin-inline-end: 6px; color: var(--c-soft); }
.eyebrow { text-transform: uppercase; letter-spacing: .06em; font-size: .78rem; color: var(--c-secondary); margin: 0; font-weight: 600; }
.lead { font-size: 1.15rem; color: var(--c-muted); max-width: 70ch; }
.meta { font-size: .88rem; color: var(--c-muted); }
.page-head { margin-bottom: 24px; }
.btn, .btn-secondary, button[type="submit"] { display: inline-block; padding: 10px 18px; border-radius: var(--radius); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; border: 2px solid var(--c-primary); }
.btn, button[type="submit"] { background: var(--c-primary); color: #fff; }
.btn-secondary { background: transparent; color: var(--c-primary); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }

.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: var(--gap); align-items: center; padding-block: 16px 24px; }
.hero-points { padding-inline-start: 1.2em; }
.hero-media img { border-radius: var(--radius); }
@media (max-width: 860px) { .hero { grid-template-columns: 1fr; } }

.grid { display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card { background: var(--c-surface); border: 1px solid var(--c-soft); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.card-body { padding: 16px 18px 18px; }
.card h3 { margin: .3em 0; }
.card h3 a { text-decoration: none; color: var(--c-text); }
.card p { margin: .4em 0; }

.intro-split { display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--gap); align-items: start; }
@media (max-width: 860px) { .intro-split { grid-template-columns: 1fr; } }

/* article */
.prose { max-width: 75ch; }
.prose table { font-size: .95rem; }
.cover img { border-radius: var(--radius); margin-bottom: 24px; }
.figure { margin: 28px 0; }
.figure img { width: 100%; max-height: 560px; object-fit: contain; border: 1px solid var(--c-soft); border-radius: var(--radius); background: #fff; }
.figure figcaption { margin-top: 8px; font-size: .9rem; color: var(--c-muted); }
.article-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 40px; align-items: start; }
.toc { position: sticky; top: 84px; font-size: .9rem; border-inline-start: 3px solid var(--c-soft); padding-inline-start: 14px; }
.toc h2 { font-size: .95rem; margin: 0 0 8px; }
.toc ol { padding-inline-start: 1.1em; margin: 0; }
@media (max-width: 960px) { .article-layout { grid-template-columns: 1fr; } .toc { position: static; } }
.callout { background: var(--c-surface); border-inline-start: 4px solid var(--c-accent); padding: 4px 18px; margin: 1.4em 0; border-radius: 0 var(--radius) var(--radius) 0; }
.related-tool { background: var(--c-surface); border: 1px solid var(--c-soft); border-radius: var(--radius); padding: 8px 22px 22px; margin-top: 40px; }

.table-wrap { overflow-x: auto; margin: 1.2em 0; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; background: var(--c-surface); }
th, td { border: 1px solid var(--c-soft); padding: 9px 12px; text-align: start; vertical-align: top; }
th { background: var(--c-bg); font-weight: 600; }
th .sort { all: unset; cursor: pointer; font-weight: 600; }
th[aria-sort="ascending"] .sort::after { content: " ▲"; }
th[aria-sort="descending"] .sort::after { content: " ▼"; }
.table-tools { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.hint { font-size: .85rem; color: var(--c-muted); margin: 0; }

/* tools */
.tool-panel { background: var(--c-surface); border: 1px solid var(--c-soft); border-radius: var(--radius); padding: clamp(16px, 3vw, 28px); margin-bottom: 32px; }
.fields { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 4px; }
.input-unit { display: flex; align-items: center; border: 1px solid var(--c-soft); border-radius: var(--radius); background: #fff; }
.input-unit input { border: 0; flex: 1; min-width: 0; padding: 10px 12px; font: inherit; background: transparent; }
.unit { padding-inline: 10px; color: var(--c-muted); font-size: .9rem; }
select, input[type="search"], .quote-input input { width: 100%; padding: 10px 12px; font: inherit; border: 1px solid var(--c-soft); border-radius: var(--radius); background: #fff; }
.actions { margin-block: 18px; }
.results dl { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); margin: 0; }
.result-row { background: var(--c-bg); border-radius: var(--radius); padding: 12px 14px; }
.result-row dt { font-size: .85rem; color: var(--c-muted); }
.result-row dd { margin: 0; font-size: 1.35rem; font-weight: 700; }
.note { font-size: .85rem; color: var(--c-muted); }
.checklist { list-style: none; padding: 0; }
.checklist li { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; border-bottom: 1px solid var(--c-soft); }
.checklist input { width: 20px; height: 20px; margin-top: 4px; flex: none; }
.progress { font-weight: 600; }

.faq details { background: var(--c-surface); border: 1px solid var(--c-soft); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; }
.link-list { list-style: none; padding: 0; }
.link-list li { padding: 10px 0; border-bottom: 1px solid var(--c-soft); }
.link-list p { margin: 4px 0 0; color: var(--c-muted); font-size: .95rem; }
.search-results { list-style: none; padding: 0; }
.search-results li { padding: 12px 0; border-bottom: 1px solid var(--c-soft); }
.disclosure { margin-top: 48px; font-size: .95rem; color: var(--c-muted); }

/* footer */
.site-footer { background: var(--c-surface); border-top: 1px solid var(--c-soft); padding-block: 32px; font-size: .92rem; }
.site-footer .wrap { display: grid; gap: 20px; grid-template-columns: 1.2fr 1fr 1fr; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 6px; }
.footer-note, .copyright { grid-column: 1 / -1; color: var(--c-muted); margin: 0; }
@media (max-width: 760px) { .site-footer .wrap { grid-template-columns: 1fr; } }

/* Cert Ledger design system */
:root{--c-primary:#123b3b;--c-secondary:#33716b;--c-accent:#ad542c;--c-soft:#d7dfd6;--c-bg:#f5f2e9;--c-surface:#fffdf7;--c-text:#172c2d;--c-muted:#52615d;--font-body:Arial,Helvetica,sans-serif;--font-head:Georgia,'Times New Roman',serif;--radius:2px;--wrap:1240px}
body{font-size:17px;line-height:1.75;background-image:linear-gradient(90deg,transparent calc(100% - 1px),#172c2d05 1px);background-size:64px 64px}
.wrap{padding-inline:clamp(20px,4vw,54px)}
.site-header{border-block-start:5px solid var(--c-primary);border-block-end:1px solid #bac5bd;background:var(--c-bg);position:relative}
.header-inner{min-height:96px;gap:24px}.brand-name{font-family:Georgia,serif;font-size:1.8rem;letter-spacing:-1px}.brand{gap:12px}.site-nav a{font-size:.83rem;font-weight:700}.site-nav ul{gap:20px}.site-nav a[aria-current]{color:var(--c-accent);text-decoration:underline;text-underline-offset:8px}
h1,h2,h3{font-weight:400;letter-spacing:-.035em}h1{font-size:clamp(2.4rem,5.6vw,4.8rem);line-height:1.04;max-width:17ch}h2{font-size:clamp(1.8rem,3.2vw,2.5rem)}h3{font-size:1.55rem;line-height:1.2}.eyebrow{font:700 .72rem/1.6 monospace;letter-spacing:.13em;text-transform:uppercase;color:var(--c-accent)}
.hero{grid-template-columns:1.08fr 1fr;gap:44px;padding-block:60px 48px;align-items:center;border-block-end:1px solid var(--c-primary)}.hero h1{white-space:pre-line}.hero .lead{font-size:1.08rem;max-width:49ch}.hero-points{list-style:none;padding:0;margin-block:24px;font-size:.88rem}.hero-points li{padding-block:7px;border-block-end:1px solid var(--c-soft)}.hero-points li:before{content:'↳';color:var(--c-accent);margin-inline-end:12px}.hero-media{margin:0;position:relative}.hero-media img{aspect-ratio:4/5;object-fit:cover;border-radius:0}.hero-media:before{content:'FIELD NOTES / LEARNING & WORK';position:absolute;z-index:1;inset-block-start:18px;inset-inline-start:18px;background:var(--c-surface);padding:5px 9px;font:10px/1.5 monospace;letter-spacing:.08em}figcaption{font:11px/1.5 monospace;color:var(--c-muted);padding-block:8px}
.btn,button[type=submit]{border-radius:0;background:var(--c-primary);font-size:.85rem;padding:13px 19px;font-weight:700}.btn-secondary{border-radius:0;font-size:.85rem;border:1px solid var(--c-primary);padding:12px 18px}.cta{gap:10px;display:flex;flex-wrap:wrap}.cta a{margin:0}
.home main>section{margin-block-end:54px}.home main>section>h2{display:flex;align-items:center;gap:18px;margin-block:36px 24px}.home main>section>h2:after{content:'';height:1px;background:#bac5bd;flex:1}.grid.cats{display:block;counter-reset:route}.cat-card{display:grid;grid-template-columns:180px 1fr;border:0;border-block-end:1px solid #bac5bd;box-shadow:none;background:transparent;padding-block:20px;gap:28px}.cat-card .card-media img{aspect-ratio:3/2;object-fit:cover}.cat-card .card-body{padding:0}.cat-card h3{margin-block:0 8px}.cat-card h3:before{counter-increment:route;content:'0' counter(route) ' / ';font:14px monospace;color:var(--c-accent);letter-spacing:0}.cat-card p{margin-block:3px}.cat-card .meta{font:11px monospace;text-transform:uppercase;margin-block-start:10px}
.grid.guides{grid-template-columns:1fr 1fr;gap:0 36px}.guide-card{display:grid;grid-template-columns:110px 1fr;gap:20px;background:transparent;border:0;border-block-start:1px solid #bac5bd;padding-block:24px;box-shadow:none}.guide-card .card-body{padding:0}.guide-card .card-media img{aspect-ratio:1;object-fit:cover}.guide-card h3{font-size:1.4rem;margin-block:5px 10px}.guide-card .eyebrow{margin:0}.guide-card .card-body>p:not(.eyebrow):not(.meta){font-size:.9rem}.guide-card .meta{font:11px monospace;color:var(--c-muted)}.card h3 a{text-decoration:none}.card h3 a:hover{text-decoration:underline}.card-media{border-radius:0}.card:hover{transform:none;box-shadow:none}
.grid.tools{grid-template-columns:1fr 1fr 1fr;gap:24px}.tool-card{background:var(--c-primary);color:#fffdf7;border:0;border-radius:0;box-shadow:none}.tool-card .card-media img{aspect-ratio:2/1;object-fit:cover}.tool-card .card-body{padding:22px}.tool-card h3{margin-block:0 14px;font-size:1.45rem}.tool-card h3 a{color:#fffdf7}.tool-card p{font-size:.9rem;color:#e1e8df}.tool-card:hover{box-shadow:none}
.breadcrumb{font:12px/1.6 monospace;padding-block:24px}.page-head{padding-block:25px 35px;border-block-end:1px solid #bac5bd;margin-block-end:32px}.page-head h1{font-size:clamp(2.3rem,4.5vw,3.7rem);max-width:25ch}.page-head .lead{max-width:68ch}.article-layout{gap:48px}.article-body,.prose{font-size:17px;max-width:76ch}.article-body h2,.prose h2{font-size:2rem;margin-block-start:44px}.article-body h3,.prose h3{font-size:1.4rem}.article-cover{border-radius:0;max-height:420px;object-fit:cover}.toc{background:#eceee4;border:0;border-block-start:3px solid var(--c-accent);border-radius:0;padding:22px;font-size:14px}.toc h2{font-size:1.4rem}.meta{font-size:12px;letter-spacing:.02em}.disclosure{border-block-start:1px solid #bac5bd;padding-block-start:20px}
.tool-panel{border:1px solid #bac5bd;border-block-start:5px solid var(--c-primary);background:var(--c-surface);box-shadow:8px 8px 0 #dce1d7;border-radius:0}.results{border-block-start:1px solid #bac5bd;padding-block-start:20px}.result-row{border-inline-start:3px solid var(--c-accent);background:#eef0e6;border-radius:0}.result-row dd{font-family:Georgia,serif;font-weight:400;font-size:2rem}.field label{font-size:.83rem}.input-unit{border-color:#87998d;border-radius:0}input,select{color:var(--c-text)}.field input:focus{outline-offset:-3px}.form-error{color:#9c2d1f;font-weight:bold}.input-unit:has(input:invalid){border-color:#a74726}table{font-size:.88rem}th{background:var(--c-primary);color:var(--c-surface);font-weight:400}th .sort{color:inherit}td{border-block-end:1px solid #c5cec3;padding:16px}tr:nth-child(even){background:#edefe5}.table-wrap{border-radius:0;max-width:100%;overflow:auto}.table-wrap table{min-width:650px}.faq details{background:transparent;border:0;border-block-end:1px solid #bac5bd;border-radius:0;padding:18px 0}.faq summary{font-weight:400;font-family:Georgia,serif;font-size:1.2rem}.link-list a{font-weight:600}.site-footer{background:var(--c-primary);color:var(--c-surface);border-block-start:6px solid var(--c-accent);padding-block:44px}.site-footer a{color:#e1e9db}.site-footer .footer-note,.site-footer .copyright{color:#c5d3c4}.footer-brand strong{font:2rem Georgia,serif}.site-footer .wrap{grid-template-columns:1.3fr 1fr 1fr}.footer-brand p{max-width:25ch}.skip-link{z-index:20}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #ad542c;outline-offset:4px}.ledger-note{border-inline-start:4px solid var(--c-accent);padding:14px 20px;background:#eceee4;max-width:78ch;font-size:.9rem}.table-tools input{max-width:430px}
@media(max-width:1000px){.header-inner{flex-wrap:wrap;padding-block:15px}.site-nav{width:100%}.site-nav ul{justify-content:space-between}.hero{gap:28px}.grid.guides{gap:0 24px}.guide-card{grid-template-columns:80px 1fr;gap:14px}.grid.tools{gap:16px}.tool-card .card-body{padding:17px}}
@media(max-width:760px){.header-inner{min-height:78px;flex-wrap:nowrap;justify-content:space-between}.site-nav{width:auto}.nav-toggle{padding:9px 14px;border:1px solid #8a9d91;border-radius:0;background:transparent;color:var(--c-primary)}.site-nav ul{gap:0}.site-nav a{display:block;padding:12px 20px}.nav-open .site-nav{background:var(--c-surface);border-block-end:2px solid var(--c-primary)}.hero{grid-template-columns:1fr;padding-block:32px;gap:24px}.hero h1{font-size:clamp(2.7rem,10vw,4rem)}.hero-media img{aspect-ratio:4/3}.hero-media:before{font-size:9px}.hero .lead{font-size:1rem}.hero-points{margin-block:18px}.grid.guides{grid-template-columns:1fr}.guide-card{grid-template-columns:90px 1fr}.grid.tools{grid-template-columns:1fr}.tool-card{display:grid;grid-template-columns:105px 1fr}.tool-card .card-media img{height:100%;aspect-ratio:auto;object-fit:cover}.cat-card{grid-template-columns:90px 1fr;gap:16px}.cat-card .card-media img{aspect-ratio:1;object-fit:cover}.cat-card h3{font-size:1.35rem}.cat-card h3:before{display:block;margin-block-end:8px}.cat-card p{font-size:.9rem}.site-footer .wrap{grid-template-columns:1fr}.home main>section{margin-block-end:32px}.fields,.results dl{grid-template-columns:1fr}.article-layout{display:block}.page-head{padding-block-start:10px}.article-body h2{font-size:1.7rem}.tool-panel{box-shadow:4px 4px 0 #dce1d7}.cta a{flex:1 1 auto;text-align:center}.toc{position:static}.brand-name{font-size:1.6rem}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}
.field,.fields,.results,.result-row{min-width:0}.field select{max-width:100%;min-width:0}.fields{grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}.input-unit input{width:100%}.card-body{min-width:0}h1,h2,h3{overflow-wrap:break-word}
@media(max-width:860px){.nav-open .site-nav{position:absolute;inset-inline:0;inset-block-start:100%;width:100%;background:var(--c-surface);border-block-end:2px solid var(--c-primary);padding-inline:20px}.nav-open .site-nav a{padding-block:12px}}
@media(max-width:760px){.fields,.results dl{grid-template-columns:minmax(0,1fr)}.field select{font-size:14px}.hero h1{max-width:100%}.hero-media:before{inset-inline-start:10px;inset-block-start:10px}}
@media(max-width:380px){.header-inner{gap:12px}.brand{gap:9px;white-space:nowrap}.brand-name{font-size:1.4rem}}

/* Homepage study gallery, 2026-11-01. */
.home .hero-gallery{display:grid;gap:12px;min-width:0;align-self:start}
.home .hero-gallery .hero-media{margin:0;min-width:0}
.home .hero-gallery .hero-media img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover}
.home .hero-details{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.home .hero-details>a{min-width:0;background:var(--c-primary);color:var(--c-surface);text-decoration:none;display:block}
.home .hero-details img{width:100%;aspect-ratio:1.8;object-fit:cover}
.home .hero-details a>span{display:flex;justify-content:space-between;gap:10px;font:12px/1.5 monospace;padding:12px 14px}
.home .grid.cats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.home .cat-card{display:block;padding:0;border:0}
.home .cat-card .card-media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.home .cat-card .card-body{padding-block:22px;border-block-end:1px solid #bac5bd}
.home .guide-card{display:block;padding-block:24px}
.home .guide-card .card-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.home .guide-card .card-body{padding-block-start:22px}
.home .guide-card h3{font-size:1.65rem}
.home .tool-card .card-media img{aspect-ratio:16/10}
@media(max-width:1000px){.home .grid.cats{gap:18px}.home .cat-card h3{font-size:1.35rem}}
@media(max-width:760px){.home .hero-gallery .hero-media img{aspect-ratio:4/3}.home .hero-details{gap:10px}.home .hero-details img{aspect-ratio:1.4}.home .hero-details a>span{font-size:11px;padding:10px;overflow-wrap:anywhere}.home .grid.cats{grid-template-columns:1fr;gap:28px}.home .cat-card .card-media img{aspect-ratio:16/10}.home .cat-card h3{font-size:1.65rem}.home .tool-card{display:block}.home .tool-card .card-media img{height:auto;width:100%;aspect-ratio:16/10}.home .tool-card .card-body{padding:24px}.home .guide-card h3{font-size:1.55rem}}