/* Public paper pages (/paper/<id> for signed-out visitors, /<lang>/paper/<id>, /papers). Same quiet
   palette as the home page; reading width, plain typography. */
:root {
  --ink: #1d1a16; --soft: #5f5a52; --faint: #9a948a; --line: #e6e1d8; --paper: #faf8f4; --card: #ffffff; --copper: #c07a45;
  color-scheme: light;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.7 'DM Sans', system-ui, -apple-system, "PingFang SC", "Hiragino Sans", "Noto Sans", "Noto Sans Thai", "Noto Sans Arabic", sans-serif; }
a { color: inherit; }

.top { display: flex; align-items: center; gap: 16px; max-width: 760px; margin: 0 auto; padding: 24px 20px 0; }
.wordmark { font-size: 15px; font-weight: 600; letter-spacing: .14em; text-decoration: none; }
.top nav { margin-inline-start: auto; font-size: 14px; }
.top nav a { text-decoration: none; color: var(--soft); }
.top nav a:hover { color: var(--ink); }

.paper { max-width: 760px; margin: 0 auto; padding: 32px 20px 24px; }
.crumb { margin: 0 0 12px; font-size: 13px; color: var(--faint); }
.crumb a { text-decoration: none; }
.crumb a:hover { color: var(--ink); }
.paper h1 { font-family: 'Bricolage Grotesque', system-ui, sans-serif; font-size: clamp(26px, 4vw, 36px); line-height: 1.2; letter-spacing: -.02em; font-weight: 600; margin: 0; }
.orig-title { margin: 8px 0 0; color: var(--soft); font-size: 15px; line-height: 1.45; }
.byline { margin: 12px 0 0; color: var(--soft); font-size: 14.5px; line-height: 1.55; }
.facts { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 12px 0 0; font-size: 13px; color: var(--soft); }
.facts .tag { padding: 1px 8px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); }
.facts a { color: var(--copper); text-decoration: none; }
.facts a:hover { text-decoration: underline; }

.cta { display: inline-flex; align-items: center; gap: 8px; margin: 12px 0 4px; height: 42px; padding: 0 18px; border-radius: 10px;
  background: var(--ink); color: #fff; text-decoration: none; font-size: 15px; font-weight: 500; }
.cta:hover { background: #3a352f; }

.paper section { margin-top: 36px; }
.paper h2 { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--copper); margin: 0 0 10px; }
.paper h3 { font-size: 18px; margin: 26px 0 6px; line-height: 1.35; }
.guide > h3:first-of-type { margin-top: 8px; }
.paper p, .paper li, .paper dd { overflow-wrap: anywhere; }
.paper .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

.tldr { margin: 0; padding: 14px 18px; list-style: none; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.tldr li + li { margin-top: 6px; }
.abstract p { margin: 0 0 10px; }
details { margin-top: 8px; }
details > summary { cursor: pointer; color: var(--soft); font-size: 14px; }
details .abstract { margin-top: 8px; color: var(--soft); }

.terms { margin: 0; display: grid; gap: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.terms dt { padding: 12px 16px 0; font-weight: 600; }
.terms dd { margin: 0; padding: 2px 16px 12px; color: var(--soft); border-bottom: 1px solid var(--line); }
.terms dd:last-child { border-bottom: 0; }

.faq { border-bottom: 1px solid var(--line); padding: 10px 0; margin: 0; }
.faq > summary { color: var(--ink); font-size: 16px; font-weight: 500; }
.faq p { margin: 8px 0 0; color: var(--soft); }

.note { margin-top: 32px; font-size: 13px; color: var(--faint); }

.list { list-style: none; margin: 0; padding: 0; }
.list li { border-bottom: 1px solid var(--line); }
.list a { display: grid; gap: 2px; padding: 14px 0; text-decoration: none; }
.list a:hover .i-title { text-decoration: underline; }
.i-title { font-size: 16.5px; font-weight: 500; line-height: 1.4; }
.i-orig { font-size: 13px; color: var(--faint); }
.i-desc { font-size: 14px; color: var(--soft); line-height: 1.5; }

.langs { max-width: 760px; margin: 24px auto 0; padding: 16px 20px 0; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 13px; color: var(--faint); }
.langs a { text-decoration: none; color: var(--soft); }
.langs a:hover { color: var(--ink); }
.langs b { font-weight: 600; color: var(--ink); }

footer { display: flex; justify-content: center; gap: 20px; padding: 32px 20px 40px; color: var(--faint); font-size: 13px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); }

a:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }