/* Always a white page (user 2026-10-27: "always on white background") - no dark theme. */
:root { color-scheme: light; --ink: #1d2320; --muted: #5b655f; --line: #dfe5e1; --bg: #ffffff; --accent: #2f6b3f; --accent-ink: #ffffff; --card: #f6f8f6; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html { background: #ffffff !important; color-scheme: light only; }
body { margin: 0; background: #ffffff !important; color: var(--ink); font: 18px/1.65 Georgia, "Times New Roman", serif; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px; }
a { color: var(--accent); }
.top { border-bottom: 1px solid var(--line); padding: 14px 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.top .wrap { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; }
.brand { font-weight: 700; font-size: 20px; text-decoration: none; color: var(--ink); }
.tag { color: var(--muted); font-size: 15px; }
h1 { font-size: 34px; line-height: 1.2; margin: 26px 0 8px; }
h2 { font-size: 25px; line-height: 1.3; margin: 34px 0 8px; }
h3 { font-size: 20px; margin: 24px 0 6px; }
.meta, .crumbs, .small { color: var(--muted); font-size: 15px; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.crumbs { margin: 20px 0 0; }
.basis { background: var(--card); border-left: 4px solid var(--accent); padding: 10px 14px; font-size: 16px; color: var(--muted); }
table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 16px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: var(--card); }
.note, .warn { padding: 10px 14px; border-radius: 6px; margin: 16px 0; font-size: 17px; }
.note { background: var(--card); border: 1px solid var(--line); }
.warn { background: rgba(200, 120, 30, .1); border: 1px solid rgba(200, 120, 30, .45); }
code, .formula { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 16px; }
.formula { display: block; background: var(--card); border: 1px solid var(--line); padding: 10px 12px; margin: 10px 0; overflow-x: auto; }
.related { border-top: 1px solid var(--line); margin-top: 36px; }
.cards { list-style: none; padding: 0; display: grid; gap: 14px; margin: 24px 0 40px; }
.cards a { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; text-decoration: none; color: var(--ink); }
.cards a:hover { border-color: var(--accent); }
.cards h2 { margin: 0 0 4px; font-size: 21px; color: var(--accent); }
.cards p { margin: 0; color: var(--muted); font-size: 16px; }
.hero p { font-size: 19px; }
.foot { border-top: 1px solid var(--line); margin-top: 40px; padding: 16px 0 30px; }
.disclosure { font-size: 15px; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
@media (max-width: 520px) { body { font-size: 17px; } h1 { font-size: 28px; } h2 { font-size: 22px; } }
figure { margin: 22px 0; }
figure img { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 8px; display: block; }
figcaption { color: var(--muted); font-size: 15px; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; margin-top: 6px; }
.disclosure-top { font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--muted); border: 1px dashed var(--line); border-radius: 6px; padding: 6px 10px; }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 10px 16px; margin: 20px 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; font-size: 16px; }
.toc-h { font-weight: 700; margin: 0 0 4px; }
.toc ol { margin: 0; padding-left: 22px; }
h2[id], h3[id] { scroll-margin-top: 12px; }
.sources li { margin: 4px 0; }
.amz-banner { border-top: 1px solid var(--line); background: var(--card); margin-top: 40px; padding: 18px 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.amz-banner p { margin: 4px 0; }
.amz-banner-h { font-weight: 700; font-size: 19px; }
.amz-banner + .foot { margin-top: 0; }

/* === shared site structure (site-pages.mjs, user 2026-11-05): header image, navbar, home, about, contact === */
.site-head{background:var(--card);border-bottom:1px solid var(--line)}
.site-banner{display:block;line-height:0}
.site-banner img{display:block;width:100%;max-width:1200px;height:auto;margin:0 auto}
.site-nav{background:var(--accent)}
.site-nav .wrap{display:flex;flex-wrap:wrap;gap:6px;padding-top:8px;padding-bottom:8px}
.site-nav a{display:inline-block;padding:8px 18px;border-radius:999px;color:var(--accent-ink);text-decoration:none;font:600 16px/1.2 Arial,sans-serif}
.site-nav a:hover,.site-nav a:focus-visible{background:rgba(255,255,255,.2)}
.site-nav a[aria-current="page"]{background:var(--accent-ink);color:var(--accent)}
.home p{font-size:18px;line-height:1.7}
.home-more{margin-top:26px}
.btn{display:inline-block;padding:10px 20px;border-radius:8px;background:var(--accent);color:var(--accent-ink)!important;text-decoration:none;font-weight:600}
.about-photo{margin:18px 0;text-align:center}
.about-photo img{max-width:100%;height:auto;border-radius:10px}
.about-photo figcaption{color:var(--muted);font-size:16px}
.contact-form{display:grid;gap:14px;max-width:560px;margin:18px 0}
.contact-form label{display:grid;gap:6px;font-weight:600}
.contact-form input,.contact-form textarea{font:16px Arial,sans-serif;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
.contact-form button{justify-self:start;padding:11px 22px;border:0;border-radius:8px;background:var(--accent);color:var(--accent-ink);font:600 16px Arial,sans-serif;cursor:pointer}
.contact-form .hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}
.form-error{color:#b42318;font-weight:600}