:root { color-scheme: light; --paper:#fff4d8; --ink:#181525; --chord:#f99d1b; --deep:#12354e; --gutter:clamp(24px,5vw,80px); --display:clamp(2.75rem,6vw,6rem); --body:1.25rem; --micro:1rem; }
* { box-sizing:border-box; }
html { scroll-padding-top:24px; }
body { margin:0; font-family:Arial,sans-serif; background:var(--paper); color:var(--ink); font-size:1.25rem; line-height:1.6; }
[lang="th"] { font-family:'IBM Plex Sans Thai','Noto Sans Thai',sans-serif; }
[lang="zh-Hans"] { font-family:'Noto Sans SC',sans-serif; }
a { color:inherit; text-underline-offset:.2em; }
a:focus-visible, summary:focus-visible { outline:3px solid currentColor; outline-offset:4px; }
.skip { position:absolute; top:0; left:0; padding:12px; background:var(--paper); transform:translateY(-200%); z-index:2; }
.skip:focus { transform:none; }
.room-header { display:flex; flex-wrap:wrap; gap:12px 32px; justify-content:space-between; padding:24px var(--gutter); font-size:var(--micro); font-weight:700; }
.room-header a { display:flex; align-items:center; min-height:44px; }
.opening { display:grid; gap:24px; padding:48px var(--gutter); background:var(--chord); color:var(--deep); }
.opening > p { margin:0; font-size:var(--micro); }
h1,h2,h3 { font-family:'Archivo Narrow',Arial,sans-serif; }
h1 { margin:0; font-size:var(--display); line-height:.93; letter-spacing:-.035em; }
.opening-note { max-width:32ch; font-size:var(--body); line-height:1.4; }
.opening-note p:first-child { font-weight:700; }
.contents { display:flex; flex-wrap:wrap; gap:8px 32px; background:var(--deep); color:var(--paper); padding:24px var(--gutter); }
.contents a { display:flex; align-items:center; min-height:44px; }
.chapter { display:grid; gap:24px; padding:56px var(--gutter); }
.chapter-label p { font-size:var(--micro); margin:0 0 16px; }
h2 { font-size:var(--display); line-height:1.05; margin:0; }
h3 { font-size:var(--body); line-height:1.2; margin:2rem 0 .75rem; }
.prose { min-width:0; max-width:64ch; }
.prose > p:first-child { margin-top:0; }
p { margin:0 0 1.25em; }
li { margin-bottom:.75em; }
.standards { background:var(--deep); color:var(--paper); }
.digest { font-size:var(--body); font-weight:700; line-height:1.4; margin:2rem 0; }
details { margin-top:24px; }
summary { padding:12px 0; cursor:pointer; min-height:48px; font-size:var(--body); }
details p { font-size:1.25rem; margin-top:12px; }
.sources { background:var(--chord); color:var(--deep); }
dt { font-weight:700; margin-top:2rem; }
dd { margin:8px 0 0; }
.download { display:block; padding:16px 0; min-height:48px; font-weight:700; }
footer { padding:32px var(--gutter); background:var(--deep); color:var(--paper); font-size:1rem; }
footer p { max-width:70ch; }
footer > a { display:inline-flex; align-items:center; min-height:44px; }
p,a,h1,h2,h3,dd,summary { overflow-wrap:anywhere; }
@media(min-width:900px) { .opening { grid-template-columns:3fr 2fr; gap:32px; }.opening > p { grid-column:1/-1; }.opening-note { align-self:end; }.chapter { grid-template-columns:minmax(220px,1fr) minmax(0,2fr); gap:64px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } }
@media print { .room-header,.contents,.download,.skip { display:none; } body,.opening,.chapter,footer { background:white; color:black; }.chapter { break-inside:avoid; } }