/* =============================================================================
   backyes report — Shared Design System (warm paper)
   ========================================================================== */
:root {
  --paper: #f6f3ec;
  --paper-light: #fcfaf6;
  --surface: rgba(255,255,255,0.86);
  --surface-strong: #ffffff;
  --line: rgba(17,17,17,0.12);
  --ink: #111111;
  --ink-soft: #4d4d4d;
  --ink-mute: #6a6a6a;
  --green: #0f5d44;
  --green-deep: #0a3f30;
  --green-soft: rgba(15,93,68,0.10);
  --green-line: rgba(15,93,68,0.25);
  --gold: #bf8b2c;
  --gold-soft: rgba(191,139,44,0.14);
  --blue: #163e7a;
  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans: 'Manrope', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --shadow: 0 24px 60px rgba(17,17,17,0.10);
  --shadow-sm: 0 2px 8px rgba(17,17,17,0.06);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --content-width: 1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.7;color:var(--ink);
  background:radial-gradient(1200px 600px at 80% -5%,rgba(191,139,44,.08),transparent 60%),
             radial-gradient(1000px 500px at 0% 10%,rgba(15,93,68,.07),transparent 55%),
             linear-gradient(180deg,#fcfaf6 0%,var(--paper) 42%,#ffffff 100%);
  background-attachment:fixed;-webkit-font-smoothing:antialiased;
}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
.page-shell{max-width:var(--content-width);margin:0 auto;padding:16px 28px 80px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:28px;flex-wrap:wrap}
.brand{display:flex;flex-direction:column;gap:4px}
.brand-name{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-serif);font-size:1.5rem;font-weight:700}
.brand-name a:hover{color:var(--green)}
.brand-tagline{font-size:.88rem;color:var(--ink-soft)}
.topnav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
.topnav a{padding:8px 14px;border:1px solid var(--line);border-radius:999px;font-size:.88rem;color:var(--ink-soft);background:rgba(255,255,255,.55)}
.topnav a:hover{color:var(--ink);border-color:rgba(17,17,17,.3)}
.article-layout{display:grid;grid-template-columns:220px 1fr;gap:40px;align-items:start}
.toc-sidebar{position:sticky;top:20px;max-height:80vh;overflow-y:auto}
.toc-title{font-size:.72rem;font-weight:600;color:var(--ink-mute);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px}
.toc ul{list-style:none;padding:0;margin:0;border-left:2px solid var(--line)}
.toc li{margin:0}
.toc a{display:block;padding:6px 12px;font-size:.85rem;color:var(--ink-soft);border-left:2px solid transparent;margin-left:-2px}
.toc a:hover{color:var(--green);border-left-color:var(--green);text-decoration:none}
.toc .toc-h2{font-weight:600}
.toc .toc-h3{padding-left:20px;font-size:.8rem}
.article-body{font-family:var(--font-serif);font-size:1.1rem;line-height:1.85}
.article-body h1{font-size:2rem;margin:0 0 16px}
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.article-body h3{font-size:1.25rem;margin:1.5em 0 .5em;padding-left:12px;border-left:3px solid var(--green)}
.article-body p{margin:.8em 0}
.article-body code{font-family:var(--font-mono);font-size:.85em;background:var(--green-soft);padding:2px 6px;border-radius:4px}
.article-body pre{background:var(--surface-strong);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px;overflow-x:auto;font-size:.85em}
.article-body blockquote{border-left:3px solid var(--green);background:var(--green-soft);padding:12px 16px;margin:1em 0;font-style:italic}
.article-body table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.9rem}
.article-body th{background:var(--green-soft);padding:10px 14px;border:1px solid var(--line);text-align:left}
.article-body td{padding:10px 14px;border:1px solid var(--line)}
.article-body tr:nth-child(even){background:rgba(15,93,68,.03)}
.article-body img{max-width:100%;border-radius:var(--radius-sm)}
.article-body hr{border:none;border-top:1px solid var(--line);margin:2em 0}
@media(max-width:900px){
  .article-layout{grid-template-columns:1fr}
  .toc-sidebar{position:static;max-height:none;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:24px}
}
@media(max-width:768px){
  .page-shell{padding:16px 16px 60px}
  .topbar{flex-direction:column;align-items:flex-start}
}