/* =========================================================================
   Arx Research Circle — research page
   Long read: sticky contents rail, a 72ch reading column,
   evidence set as sourced entries (claim · figure · source · caveat).
   ========================================================================= */

/* Title block */
.title { padding-block: clamp(56px, 8vw, 112px) clamp(40px, 5vw, 64px); border-bottom: 1px solid var(--line); }
.title h1 { font: 600 clamp(38px, 6vw, 80px)/1.02 var(--display); letter-spacing: -.025em; margin: 18px 0 0; max-width: 15em; text-wrap: balance; }
.title h1 em { font-style: normal; color: var(--accent); }
.title .dek { font: 400 clamp(19px, 1.8vw, 23px)/1.5 var(--read); color: var(--muted); max-width: 36em; margin: 26px 0 0; }
.meta { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 34px; font: 400 12px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

/* Body layout */
.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: clamp(32px, 6vw, 88px); padding-block: clamp(48px, 6vw, 88px); }
.toc { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 96px); align-self: start; }
.toc ol { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 2px; }
.toc a { display: grid; grid-template-columns: 28px minmax(0, 1fr); padding: 8px 0; font-size: 14px; line-height: 1.35; color: var(--muted); text-decoration: none; border-top: 1px solid var(--line); }
.toc a:hover { color: var(--fg); }
.toc a span { font: 500 12px/1.6 var(--mono); color: var(--accent); }
@media (max-width: 960px) { .layout { grid-template-columns: 1fr; } .toc { position: static; } }

article.essay { min-width: 0; max-width: 72ch; }
.essay section + section { margin-top: clamp(72px, 9vw, 120px); }
.essay h2 { font: 600 clamp(28px, 3.4vw, 42px)/1.1 var(--display); letter-spacing: -.02em; margin: 12px 0 0; text-wrap: balance; }
.essay p.read { font: 400 19px/1.65 var(--read); color: var(--fg-soft); margin: 22px 0 0; }
.essay p.read strong { color: var(--fg); font-weight: 500; }
.num { font: 500 12px/1 var(--mono); color: var(--accent); letter-spacing: .14em; }

/* Evidence entries */
.evidence { margin-top: 40px; display: grid; gap: 0; border-top: 1px solid var(--line); }
.ev { padding: 28px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 32px; }
.ev h3 { font: 600 21px/1.3 var(--display); margin: 0; letter-spacing: -.005em; grid-column: 1; }
.ev .fig { grid-column: 2; grid-row: 1 / span 2; font: 600 clamp(30px, 3.4vw, 44px)/1 var(--display); letter-spacing: -.03em; color: var(--accent); font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; }
.ev .fig small { display: block; font: 400 11px/1.3 var(--mono); letter-spacing: .08em; color: var(--muted); text-transform: uppercase; margin-top: 6px; }
.ev .src { grid-column: 1; font: 400 12.5px/1.5 var(--mono); color: var(--muted); letter-spacing: .02em; }
.ev .src a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.ev p { grid-column: 1 / -1; margin: 6px 0 0; color: var(--muted); font-size: 16px; line-height: 1.6; }
.ev p.caveat { font-size: 14px; border-left: 2px solid var(--line); padding-left: 14px; margin-top: 10px; }
.ev p.caveat b { color: var(--fg); font-weight: 500; }
@media (max-width: 560px) {
  .ev { grid-template-columns: 1fr; }
  .ev .fig { grid-column: 1; grid-row: auto; text-align: left; order: -1; }
}

/* Reading box: Arx's own view, marked as such */
.view { margin-top: 36px; padding: 26px 28px; background: var(--bg-raise); border: 1px solid var(--line); border-radius: 6px; }
.view .label { color: var(--fg); }
.view p { margin: 12px 0 0; font: 400 18px/1.6 var(--read); color: var(--fg-soft); }

/* Chart */
.chart { margin-top: 36px; }
.bars { display: grid; gap: 14px; margin-top: 18px; }
.bar { display: grid; grid-template-columns: 170px minmax(0, 1fr) 60px; gap: 14px; align-items: center; font-size: 15px; }
.bar .track { height: 12px; background: var(--line); border-radius: 2px; overflow: hidden; }
.bar .fill { height: 100%; background: var(--muted); border-radius: 2px; }
.bar.hi .fill { background: var(--accent); }
.bar.hi { color: var(--fg); }
.bar:not(.hi) { color: var(--muted); }
.bar .v { font: 500 14px/1 var(--mono); text-align: right; font-variant-numeric: tabular-nums; }
.chart figcaption { font: 400 12px/1.5 var(--mono); color: var(--muted); margin-top: 16px; }
@media (max-width: 520px) { .bar { grid-template-columns: 110px minmax(0, 1fr) 52px; font-size: 13px; } }

/* Principles */
.principles { margin-top: 36px; display: grid; gap: 0; counter-reset: p; border-top: 1px solid var(--line); }
.principles div { padding: 22px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 4px 14px; }
.principles div::before { counter-increment: p; content: counter(p, decimal-leading-zero); font: 500 13px/1.6 var(--mono); color: var(--accent); grid-row: 1 / span 2; }
.principles b { font: 600 19px/1.35 var(--display); }
.principles span { color: var(--muted); font-size: 16px; }

/* Sources */
.sources ol { margin: 20px 0 0; padding-left: 22px; display: grid; gap: 12px; font-size: 14.5px; color: var(--muted); }
.sources a { color: var(--fg); text-underline-offset: 3px; text-decoration-thickness: 1px; word-break: break-word; }

.close { border-top: 1px solid var(--line); padding-block: clamp(64px, 8vw, 110px); }
.close h2 { font: 600 clamp(30px, 4.4vw, 56px)/1.05 var(--display); letter-spacing: -.02em; margin: 14px 0 0; max-width: 16em; text-wrap: balance; }
.close .btn { margin-top: 30px; }