:root{
  --bg-dark:#0c0a14;
  --bg-dark-2:#15112a;
  --bg-card:#1e1835;
  --text-white:#f0f6fc;
  --text-muted:#8b949e;
  --border:#2d2252;
  --accent:#a855f7;
  
  --bg-section:color-mix(in srgb,var(--bg-dark) 92%,white);
  --border-light:var(--border);
  --text-body:var(--text-muted);--text-dark:var(--text-white);
  --radius-btn:8px;--radius-card:12px;--radius-badge:20px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,Arial,sans-serif;background:var(--bg-dark);color:var(--text-white);line-height:1.8}
a{color:inherit;text-decoration:none}
header{position:sticky;top:0;z-index:100;background:var(--bg-dark);padding:0 20px}
header .d317-header-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:60px}
header.d317-scrolled{backdrop-filter:blur(12px);box-shadow:0 1px 0 var(--border)}
.d317-logo{font-size:20px;font-weight:700;color:var(--text-white)}
.d317-burger{display:none;background:none;border:none;color:var(--text-white);font-size:22px;cursor:pointer}
nav{display:flex;gap:28px;align-items:center}
nav a{color:var(--text-muted);font-size:14px;font-weight:500;transition:opacity 0.2s}
nav a:hover{color:var(--text-white)}
.d317-hero{background:var(--bg-dark);color:var(--text-white);padding:40px 20px 24px;contain:layout}
.d317-hero-inner{max-width:900px;margin:0 auto}
.d317-date-badge{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);border-radius:var(--radius-badge);padding:4px 14px;font-size:12px;color:var(--text-muted);margin-bottom:20px;flex-wrap:wrap}
.d317-hero h1{font-size:clamp(24px,5vw,44px);font-weight:800;line-height:1.15;margin-bottom:20px;max-width:720px}
.d317-hero-sub{font-size:17px;line-height:1.75;color:var(--text-muted);max-width:620px;margin-bottom:32px;display:block}
.d317-cta-btn,.btn-primary,.cta-btn,.btn-cta,.btn-claim{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:14px 28px;border-radius:var(--radius-btn);font-weight:700;font-size:16px;border:none;cursor:pointer;text-decoration:none;transition:opacity 0.2s;box-shadow:0 4px 14px rgba(0,0,0,.25);margin-bottom:24px}
.d317-toc-block{background:rgba(255,255,255,.05);border:1px solid var(--border);border-radius:var(--radius-card);max-width:900px;margin:0 auto 16px;overflow:hidden;contain:layout;min-height:54px}
.d317-toc-toggle{width:100%;display:flex;align-items:center;gap:10px;padding:14px 20px;background:none;border:none;cursor:pointer;font-size:15px;font-weight:600;color:var(--text-white);text-align:left}
.d317-toc-arrow{margin-left:auto;font-size:12px;color:var(--text-muted);transition:transform .25s}
.d317-toc-block.d317-open .d317-toc-arrow{transform:rotate(180deg)}
.d317-toc-list{display:none;padding:0 20px 16px;border-top:1px solid var(--border)}
.d317-toc-block.d317-open .d317-toc-list{display:block}
.d317-toc-link{display:flex;align-items:baseline;gap:10px;padding:9px 0;font-size:14px;color:var(--text-muted);border-bottom:1px solid var(--border);text-decoration:none;transition:color .2s}
.d317-toc-link:last-child{border-bottom:none}
.d317-toc-num{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--accent);color:#fff;font-size:11px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.d317-content-wrap{max-width:900px;margin:0 auto;padding:0 20px 80px}
.d317-content-section{padding-top:56px;border-top:1px solid var(--border);margin-top:48px}
.d317-content-section:first-child{border-top:none;margin-top:0}
.d317-content-section h2{font-size:26px;font-weight:700;color:var(--text-white);margin-bottom:20px}
.d317-content-section h3{font-size:20px;font-weight:600;color:var(--text-white);margin:28px 0 12px}
.d317-content-section p{font-size:16px;line-height:1.8;color:var(--text-muted);margin-bottom:16px}
.d317-table-wrap{overflow-x:auto;border-radius:10px;border:1px solid var(--border);margin-bottom:24px}
.d317-table-wrap table{width:100%;border-collapse:collapse;font-size:14px}
.d317-table-wrap thead tr{background:rgba(255,255,255,.08);color:var(--text-white)}
.d317-table-wrap thead th{padding:12px 16px;font-weight:600;text-align:left}
.d317-table-wrap tbody td{padding:10px 16px;border-bottom:1px solid var(--border);color:var(--text-muted)}
.d317-content-section ul,.d317-content-section ol{padding-left:0;list-style:none;margin-bottom:20px}
.d317-content-section ul li,.d317-content-section ol li{display:flex;align-items:flex-start;gap:10px;margin-bottom:10px;font-size:16px;line-height:1.6;color:var(--text-muted)}
.d317-content-section ul li::before{content:"✓";color:var(--accent);font-weight:700;flex-shrink:0;margin-top:3px}
.d317-term-label{display:block;font-weight:700;font-size:15px;color:var(--text-white);margin-bottom:4px}
.d317-term-desc{font-size:15px;color:var(--text-muted);line-height:1.6}
.d317-faq-item{margin-bottom:10px}
.d317-faq-question{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;background:rgba(255,255,255,.05);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius-card);cursor:pointer;font-weight:600;font-size:15px;color:var(--text-white)}
.d317-faq-answer{display:none;padding:14px 20px;font-size:15px;color:var(--text-muted);line-height:1.7;border:1px solid var(--border);border-top:none;border-radius:0 0 var(--radius-card) var(--radius-card)}
.d317-faq-item.d317-open .d317-faq-answer{display:block}
footer{background:var(--bg-dark);color:var(--text-muted);padding:40px 20px 24px;font-size:14px}
.d317-footer-inner{max-width:900px;margin:0 auto}
section{padding:0}
@media(max-width:768px){
  .d317-burger{display:block}
  nav{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:var(--bg-dark);flex-direction:column;justify-content:center;align-items:center;gap:32px;z-index:200}
  nav.d317-open{display:flex}
  .d317-hero h1{font-size:26px}
}

/* ── author-box ────────────────────────────────────── */
.d317-author-box{background:var(--bg-card);border-left:4px solid var(--accent);border-radius:10px;padding:24px;margin:48px 0;}
.d317-author-box-inner{display:flex;gap:16px;align-items:flex-start;margin-bottom:16px;}
.d317-author-box .d317-author-name{font-weight:700;font-size:17px;color:var(--text-white);}
.d317-author-box .d317-author-role{font-size:13px;color:var(--text-muted);}
.d317-author-title{font-size:13px;color:var(--text-muted);}
.d317-author-box p{font-size:15px;color:var(--text-muted);margin-bottom:12px;}
.d317-author-expertise{list-style:none;padding:0;margin-bottom:16px;}
.d317-author-expertise li{font-size:14px;color:var(--text-muted);padding:3px 0;display:flex;align-items:flex-start;gap:6px;}
.d317-author-expertise li::before{content:'✓';color:var(--accent);font-weight:700;flex-shrink:0;}
.d317-author-box a{color:var(--accent);font-weight:600;font-size:14px;}

/* ── reviewers ─────────────────────────────────────── */
.d317-reviewers{max-width:900px;margin:0 auto;padding:48px 20px;border-top:1px solid var(--border);}
.d317-reviewers h2{font-size:22px;font-weight:700;margin-bottom:24px;color:var(--text-white);}
.d317-reviewers-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.d317-reviewer-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:20px;}
.d317-reviewer-header{display:flex;align-items:center;gap:12px;margin-bottom:8px;}
.d317-reviewer-name{font-weight:700;font-size:15px;color:var(--text-white);}
.d317-reviewer-role{font-size:13px;color:var(--text-muted);}
.d317-reviewer-stars{color:var(--accent);margin-bottom:4px;font-size:14px;}
.d317-reviewer-date{font-size:12px;color:var(--text-muted);margin-bottom:10px;}
.d317-reviewer-quote{font-style:italic;font-size:14px;color:var(--text-muted);line-height:1.6;border-left:2px solid var(--border);padding-left:12px;}
@media(max-width:768px){
  .d317-reviewers-grid{grid-template-columns:1fr;}
}