/* FitNexusPRO Journal (/blog). Standalone, like landing.css: tokens mirror
   ui/slate.css, dark by default, light via localStorage.theme (set pre-paint
   in the page head). Reading layout: 680px measure, serif body. */

:root {
  --bg: #0B0D10; --surface: #14171C; --surface-2: #1B1F26;
  --line: #262B33; --line-strong: #353C48;
  --text: #F2F4F7; --text-2: #A9B1BE; --text-3: #8A93A1;
  --accent: #FF8A3D; --accent-bg: rgba(255, 138, 61, .14);
  --font-ui: 'Barlow', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Barlow Condensed', 'Arial Narrow', system-ui, sans-serif;
  --font-read: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #F2F3F5; --surface: #FFFFFF; --surface-2: #F4F5F7;
  --line: #E1E4E9; --line-strong: #CBD0D8;
  --text: #12151A; --text-2: #4A5261; --text-3: #646C79;
  --accent: #C9510C; --accent-bg: rgba(201, 81, 12, .10);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.jr { margin: 0; background: var(--bg); color: var(--text); font: 400 17px/1.5 var(--font-ui); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
img { max-width: 100%; display: block; }

/* header and footer */
.jr-nav { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px max(16px, calc((100% - 1040px) / 2)); background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.jr-brand { font: 700 24px var(--font-display); text-decoration: none; letter-spacing: .01em; }
.jr-brand b { color: var(--accent); font-weight: 700; }
.jr-nav nav { display: flex; align-items: center; gap: 20px; font-weight: 500; }
.jr-nav nav a { text-decoration: none; color: var(--text-2); }
.jr-nav nav a:hover { color: var(--text); }
.jr-nav .jr-cta { color: var(--accent); border: 1px solid var(--accent); border-radius: 999px; padding: 6px 16px; }
.jr-foot { max-width: 680px; margin: 72px auto 0; padding: 24px 20px 56px; border-top: 1px solid var(--line);
  color: var(--text-3); font-size: 14px; line-height: 1.6; }
.jr-foot a { color: var(--text-2); }

/* article */
.jr-article { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.hero { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 16px; margin: 24px 0 0; background: var(--surface); }
.hero--type { background: radial-gradient(120% 120% at 15% 0%, #3a2112 0%, var(--surface) 48%, var(--bg) 100%); border: 1px solid var(--line); }
.jr-article > header, .prose, .refs { max-width: 680px; margin-left: auto; margin-right: auto; }
.jr-article header { padding-top: 40px; }
.kicker { margin: 0 0 14px; color: var(--accent); font: 600 14px var(--font-ui); letter-spacing: .14em; text-transform: uppercase; }
.jr-article h1 { margin: 0; font: 700 clamp(40px, 7vw, 66px)/1.0 var(--font-display); text-transform: uppercase; text-wrap: balance; }
.dek { margin: 18px 0 0; color: var(--text-2); font-size: clamp(19px, 2.4vw, 23px); line-height: 1.4; text-wrap: pretty; }
.byline { margin: 22px 0 0; padding-bottom: 28px; border-bottom: 1px solid var(--line); color: var(--text-3); font-size: 15px; }

.prose { padding-top: 12px; font-family: var(--font-read); font-size: 20px; line-height: 1.68; }
.prose p, .prose ul, .prose ol { margin: 1.35em 0; }
.prose h2 { margin: 2em 0 .5em; font: 600 34px/1.1 var(--font-display); font-family: var(--font-display); scroll-margin-top: 80px; }
.prose a { color: var(--accent); text-underline-offset: 3px; }
.prose li { margin: .45em 0; }
.prose strong { font-weight: 600; }
sup.fn { font: 600 .68em var(--font-ui); vertical-align: super; line-height: 0; }
sup.fn a { text-decoration: none; padding: 0 1px; }
.prose blockquote { margin: 2em 0; padding: 4px 0 4px 22px; border-left: 4px solid var(--accent);
  font-size: 25px; line-height: 1.45; font-style: italic; }
.prose blockquote p { margin: 0; }
.prose cite { display: block; margin-top: 10px; color: var(--text-3); font: 500 15px var(--font-ui); font-style: normal; }
.callout { margin: 2em 0; padding: 20px 22px; background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; }
.callout strong { display: block; margin-bottom: 4px; font: 700 14px var(--font-ui); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.callout p { margin: 0; font-size: 19px; }

.prose figure { margin: 2em 0; }
.prose figure img { width: 100%; border-radius: 12px; }
.prose figcaption { margin-top: 10px; color: var(--text-3); font: 400 14px/1.4 var(--font-ui); }
.chartfig { padding: 20px 18px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
.chart { width: 100%; height: auto; display: block; }
.chart path { stroke: var(--accent); }
.chart circle { fill: var(--accent); }
.chart .axis { font: 500 26px var(--font-ui); fill: var(--text-3); }
.chart .endlabel { font: 700 44px var(--font-display); fill: var(--accent); }
.chart--empty text { font: 500 30px var(--font-ui); fill: var(--text-3); }

.databox { margin: 2em 0; padding: 22px 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  display: grid; gap: 4px; font-family: var(--font-ui); }
.databox .value { font: 700 64px/1 var(--font-display); color: var(--accent); }
.databox small { margin-left: 8px; font: 600 26px var(--font-display); color: var(--text-2); }
.databox .label { color: var(--text); font-size: 18px; }
.databox .source { color: var(--text-3); font-size: 13px; }

.prose details { margin: 0; border-bottom: 1px solid var(--line); font-family: var(--font-ui); }
.prose details:first-of-type { border-top: 1px solid var(--line); }
.prose summary { padding: 16px 28px 16px 0; cursor: pointer; font: 600 18px var(--font-ui); list-style: none; position: relative; }
.prose summary::after { content: '+'; position: absolute; right: 4px; color: var(--accent); font-size: 24px; line-height: 1; }
.prose details[open] summary::after { content: '\2212'; }
.prose details p { margin: 0 0 18px; font: 400 17px/1.6 var(--font-read); color: var(--text-2); }

.refs { margin-top: 56px; padding-top: 8px; border-top: 1px solid var(--line); font-family: var(--font-ui); }
.refs h2 { font: 600 28px var(--font-display); margin: 24px 0 12px; }
.refs ol { margin: 0; padding-left: 22px; color: var(--text-2); font-size: 15px; line-height: 1.55; }
.refs li { margin: 8px 0; scroll-margin-top: 80px; }
.refs li:target { background: var(--accent-bg); }
.refs a { color: var(--accent); }

/* index */
.jr-index { max-width: 1040px; margin: 0 auto; padding: 48px 20px 0; }
.jr-index h1 { margin: 0; font: 700 clamp(44px, 8vw, 76px)/1 var(--font-display); text-transform: uppercase; }
.jr-index header p { margin: 14px 0 0; color: var(--text-2); font-size: 20px; max-width: 560px; }
.jr-list { display: grid; gap: 20px; margin-top: 36px; }
.jr-card { display: grid; gap: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
  text-decoration: none; transition: border-color .2s, transform .2s; }
.jr-card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.jr-card img, .thumb { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: var(--surface-2); }
.thumb--type { background: radial-gradient(120% 120% at 15% 0%, #3a2112 0%, var(--surface-2) 55%, var(--surface) 100%); }
.jr-card div { padding: 20px 22px 24px; display: grid; gap: 8px; align-content: start; }
.jr-card h2 { margin: 0; font: 700 28px/1.05 var(--font-display); text-transform: uppercase; }
.jr-card p { margin: 0; color: var(--text-2); }
.jr-card span { color: var(--text-3); font-size: 14px; }
.empty { color: var(--text-3); padding: 40px 0; }
@media (min-width: 760px) {
  .jr-list { grid-template-columns: 1fr 1fr; }
  .jr-card--feature { grid-column: 1 / -1; grid-template-columns: 1.4fr 1fr; }
  .jr-card--feature div { padding: 32px; align-content: center; }
  .jr-card--feature h2 { font-size: 44px; }
}
/* The chart is one SVG that scales with its width, so its text shrinks on a phone.
   Larger user-unit sizes keep the axis and latest value readable there. */
@media (max-width: 600px) {
  .chart .axis { font-size: 44px; }
  .chart .endlabel { font-size: 76px; }
  .chartfig { padding: 14px 12px 10px; }
}
@media (prefers-reduced-motion: reduce) { .jr-card { transition: none; } .jr-card:hover { transform: none; } }