:root{--bg:#0b0d10;--bg-alt:#12151a;--panel:#161a20;--gold:#c9a15a;--gold-bright:#e8c27a;--green:#3ecf8e;--red:#e5626a;--text:#edeae3;--text-dim:#9aa0a6;--line:#232830;--radius:10px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text)}
body{font-family:'Space Mono',monospace;line-height:1.6}
body.lang-fa{font-family:'Vazirmatn',sans-serif;line-height:1.8}
[dir="ltr"]{font-family:'Space Mono',monospace;line-height:1.6}
.fa-text{display:none}
body.lang-fa .en-text{display:none}
body.lang-fa .fa-text{display:inline}
h1,h2,h3,p{margin:0}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
section{scroll-margin-top:80px;}

.nav-lang{font-size:11px;font-family:'Space Mono',monospace;font-weight:700;padding:6px 10px;border:1px solid var(--line);border-radius:6px;color:var(--text-dim);cursor:pointer;background:none}
.nav-lang:hover{border-color:var(--gold);color:var(--gold-bright)}

.topnav{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:#111419;border-bottom:1px solid var(--line);direction:ltr;font-family:'Space Mono',monospace}
.topnav .logo{font-weight:700;font-size:14px;color:var(--text);letter-spacing:.02em}
.topnav .logo span{color:var(--gold-bright)}
.topnav ul{display:flex;align-items:center;gap:26px}
.topnav a{font-size:12.5px;color:var(--text-dim);letter-spacing:.03em;transition:color .15s ease}
.topnav a:hover{color:var(--gold-bright)}
.topnav .nav-order{color:var(--gold);font-weight:700}
@media(max-width:720px){.topnav{padding:12px 16px;flex-wrap:wrap;gap:8px}.topnav ul{gap:14px;width:100%;justify-content:center}.topnav a{font-size:11px}}

.breadcrumb{max-width:760px;margin:28px auto 0;padding:0 24px;font-size:13px;color:var(--text-dim);display:flex;gap:8px;flex-wrap:wrap;direction:ltr;}
body.lang-fa .breadcrumb{direction:rtl;}
.breadcrumb a:hover{color:var(--gold-bright);}

.article-hero{max-width:760px;margin:18px auto 0;padding:0 24px;direction:ltr;}
body.lang-fa .article-hero{direction:rtl;}
.article-hero .tag{font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);}
.article-hero h1{margin-top:14px;font-size:clamp(26px,3.6vw,38px);font-weight:900;line-height:1.5;}
.article-hero .meta{margin-top:18px;font-family:'Space Mono',monospace;font-size:12.5px;color:#58657A;direction:ltr;text-align:left;}
body.lang-fa .article-hero .meta{text-align:right;}

.cover{max-width:760px;margin:32px auto 0;padding:0 24px;}
.cover-inner{
  position:relative;height:220px;border-radius:14px;overflow:hidden;
  background:#0d1117;border:1px solid var(--line);
}
.cover-grid{position:absolute;inset:0;background-image:linear-gradient(#161A20 1px,transparent 1px),linear-gradient(90deg,#161A20 1px,transparent 1px);background-size:40px 40px;opacity:.35;}
.cover-glow{position:absolute;top:-140px;right:-100px;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(201,161,90,.18),transparent 70%);}
.cover-word{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:'Space Mono',monospace;font-size:30px;font-weight:700;color:#EDEAE3;letter-spacing:.02em;}
.cover-word span{color:var(--gold-bright);}

.wrap{max-width:760px;margin:0 auto;padding:44px 24px 100px;}

.toc{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-bottom:44px;}
.toc h2{font-size:14px;color:var(--gold);font-family:'Space Mono',monospace;letter-spacing:.05em;text-transform:uppercase;margin-bottom:14px;}
.toc ol{list-style:decimal;padding-inline-start:20px;display:flex;flex-direction:column;gap:8px;}
.toc a{font-size:14.5px;color:var(--text-dim);}
.toc a:hover{color:var(--gold-bright);}

.prose h2{font-size:22px;font-weight:800;margin-top:52px;margin-bottom:16px;color:var(--text);}
.prose h2 .num{color:var(--gold);font-family:'Space Mono',monospace;margin-inline-end:10px;}
.prose p{font-size:15.5px;color:#C9D1D9;margin-top:14px;line-height:2;}
.prose ul{margin-top:14px;display:flex;flex-direction:column;gap:10px;padding-inline-start:4px;}
.prose ul li{font-size:15px;color:#C9D1D9;padding-inline-start:20px;position:relative;line-height:1.9;}
.prose ul li::before{content:'—';position:absolute;left:0;color:var(--gold);}
body.lang-fa .prose ul li::before{left:auto;right:0;}
body.lang-fa .prose ul li{padding-inline-start:20px;}
.prose b{color:var(--text);}
.prose code{font-family:'Space Mono',monospace;direction:ltr;display:inline-block;background:#161B22;border:1px solid var(--line);border-radius:4px;padding:1px 8px;font-size:13px;color:#7EE8B0;}

.callout{
  margin-top:22px;background:#0d1117;border:1px solid var(--line);border-inline-start:3px solid var(--gold);
  border-radius:8px;padding:18px 22px;
}
.callout p{margin-top:0;font-size:14.5px;color:var(--text-dim);}
.callout b{color:var(--gold-bright);}

.flow{margin-top:20px;display:flex;flex-wrap:wrap;align-items:center;gap:10px;direction:ltr;}
.flow .step{background:#161B22;border:1px solid var(--line);border-radius:8px;padding:10px 16px;font-family:'Space Mono',monospace;font-size:13px;color:var(--text);}
.flow .arrow{color:var(--gold);font-size:16px;}

.cta-box{
  margin-top:60px;background:linear-gradient(180deg,var(--bg-alt),var(--bg));border:1px solid var(--line);
  border-radius:14px;padding:36px 30px;text-align:center;
}
.cta-box h3{font-size:20px;font-weight:800;}
.cta-box p{margin-top:10px;color:var(--text-dim);font-size:14.5px;}
.cta-row{margin-top:22px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:6px;font-size:14px;font-weight:700;}
.btn-primary{background:var(--gold);color:#181206;}
.btn-ghost{border:1px solid var(--line);color:var(--text);}

.author-box{margin-top:44px;display:flex;align-items:center;gap:14px;padding:20px;border:1px solid var(--line);border-radius:var(--radius);}
.author-avatar{width:44px;height:44px;border-radius:50%;background:var(--gold);flex-shrink:0;display:flex;align-items:center;justify-content:center;font-weight:900;color:#181206;font-family:'Space Mono',monospace;}
.author-box .name{font-size:14.5px;font-weight:700;}
.author-box .role{font-size:13px;color:var(--text-dim);margin-top:2px;}

footer{padding:26px 24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;font-family:'Space Mono',monospace;font-size:12px;color:var(--text-dim)}
footer a:hover{color:var(--gold-bright)}
footer .fa-copy{direction:rtl;font-family:'Vazirmatn',sans-serif}

/* ---- shared diagram widgets for articles ---- */
.diagram{margin-top:22px;background:#0d1117;border:1px solid var(--line);border-radius:12px;padding:26px 22px;direction:ltr;}
.diagram-cap{margin-top:14px;font-size:13px;color:var(--text-dim);text-align:center;direction:ltr;}
body.lang-fa .diagram-cap{direction:rtl;}

.ruler{position:relative;height:70px;}
.ruler .track{position:absolute;top:34px;left:0;right:0;height:2px;background:var(--line);}
.ruler .pt{position:absolute;top:24px;width:2px;height:22px;background:var(--gold);}
.ruler .pt.sl{background:var(--red);}
.ruler .lbl{position:absolute;top:0;font-family:'Space Mono',monospace;font-size:11px;color:var(--text-dim);white-space:nowrap;}
.ruler .lbl.gold{color:var(--gold-bright);}
.ruler .lbl.red{color:#F08080;}
.ruler .span{position:absolute;top:34px;height:2px;background:repeating-linear-gradient(90deg,var(--text-dim) 0 4px,transparent 4px 8px);}

.stackbar{display:flex;height:34px;border-radius:6px;overflow:hidden;border:1px solid var(--line);}
.stackbar .seg{display:flex;align-items:center;justify-content:center;font-family:'Space Mono',monospace;font-size:12px;font-weight:700;color:#0D1117;}
.stackbar .kept{background:#3ECF8E;}
.stackbar .closed{background:#2A3245;color:#8B949E;}

.rows-diagram{display:flex;flex-direction:column;gap:10px;}
.rows-diagram .row{display:flex;align-items:center;gap:12px;background:#161B22;border:1px solid var(--line);border-radius:8px;padding:10px 14px;font-family:'Space Mono',monospace;font-size:12.5px;}
.rows-diagram .row .b{background:#1A7A4A;color:#7EE8B0;border-radius:5px;padding:2px 8px;font-weight:700;font-size:11px;}
.rows-diagram .row .arrow-be{margin-inline-start:auto;color:var(--green);font-size:12px;}

.funnel{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;}
.funnel .src{background:#161B22;border:1px solid var(--line);border-radius:8px;padding:12px 16px;font-family:'Space Mono',monospace;font-size:12px;color:var(--text-dim);text-align:center;}
.funnel .arrow{color:var(--gold);font-size:18px;}
.funnel .dest{background:#0A2814;border:1px solid #22A060;color:#7EE8B0;border-radius:8px;padding:14px 20px;font-family:'Space Mono',monospace;font-size:13px;font-weight:700;text-align:center;}

.icon-badge{width:34px;height:34px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:16px;font-weight:900;flex-shrink:0;}