:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --green:#16a34a;
  --amber:#d97706;
  --red:#dc2626;
  --purple:#7c3aed;
  --bg:#f4f7fb;
  --surface:#ffffff;
  --text:#172033;
  --muted:#64748b;
  --border:#e2e8f0;
  --code:#f1f5f9;
  --dark:#0f172a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"Vazirmatn",Tahoma,sans-serif;
  line-height:2;direction:rtl;
}
.hero{
  background:
    radial-gradient(circle at 12% 18%,rgba(37,99,235,.28),transparent 26%),
    radial-gradient(circle at 88% 10%,rgba(22,163,74,.18),transparent 24%),
    linear-gradient(135deg,#0b1220,#172554 62%,#0f172a);
  color:#fff;padding:58px 24px 48px;
}
.hero-inner{max-width:1220px;margin:0 auto}
.eyebrow{
  direction:ltr;display:inline-block;letter-spacing:2px;
  font-size:.76rem;font-weight:800;color:#93c5fd;
  margin-bottom:6px;
}
.hero h1{margin:0;font-size:2.35rem;line-height:1.55}
.hero h1 span{
  direction:ltr;display:inline-block;font-size:1.3rem;
  font-weight:400;color:#cbd5e1;
}
.hero p{margin:10px 0 0;color:#cbd5e1;max-width:920px}
.hero-metrics{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;
  margin-top:28px;max-width:980px;
}
.metric{
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  border-radius:12px;padding:12px 14px;backdrop-filter:blur(8px);
}
.metric strong{display:block;font-size:1.15rem;color:#fff;direction:ltr}
.metric span{display:block;font-size:.75rem;color:#cbd5e1}
.top-nav{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1220px;margin:0 auto;padding:8px 18px;
  display:flex;gap:6px;overflow-x:auto;
}
.nav-inner a{
  white-space:nowrap;text-decoration:none;color:var(--muted);
  padding:7px 11px;border-radius:8px;font-size:.84rem;
}
.nav-inner a:hover,.nav-inner a.active{color:var(--primary);background:#eff6ff}
.portal-back{
  position:fixed;left:18px;bottom:18px;z-index:1000;
  background:#fff;color:var(--primary);border:1px solid var(--border);
  padding:8px 13px;border-radius:10px;text-decoration:none;
  box-shadow:0 8px 22px rgba(15,23,42,.12);font-size:.82rem;line-height:1.5;
}
.portal-back:hover{background:#eff6ff}
.container{
  max-width:1220px;margin:30px auto;padding:22px 54px 56px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:18px;box-shadow:0 12px 40px rgba(15,23,42,.05);
}
section{
  padding:40px 0;border-bottom:1px solid var(--border);
  scroll-margin-top:68px;
}
section:last-child{border-bottom:0}
.intro{
  padding:15px 0 35px;font-size:1.06rem;
}
p{text-align:justify;margin:0 0 18px}
h2{
  font-size:1.52rem;margin:0 0 23px;color:#0f172a;
  display:flex;align-items:center;gap:10px;line-height:1.6;
}
.section-number{
  flex:0 0 auto;background:var(--primary);color:#fff;
  min-width:38px;height:38px;padding:0 8px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:10px;font-size:.98rem;font-weight:800;
}
h3{margin:0 0 8px;font-size:1.02rem;color:#0f172a}
hr{border:0;border-top:1px solid var(--border);margin:0}
.diagram-card{
  direction:ltr;overflow:auto;margin:30px 0;padding:24px;
  border:1px solid var(--border);border-radius:14px;background:#fbfdff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.8);
}
.diagram-card .mermaid{min-width:max-content;text-align:center}
.table-wrapper{
  overflow-x:auto;margin:26px 0;border:1px solid var(--border);
  border-radius:12px;background:#fff;
}
table{width:100%;border-collapse:collapse;min-width:720px;direction:rtl}
th{
  background:#eff6ff;color:#1e3a8a;font-weight:800;
}
th,td{
  padding:14px 16px;border-bottom:1px solid var(--border);
  text-align:right;vertical-align:top;
}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#f8fafc}
code{
  direction:ltr;unicode-bidi:embed;display:inline-block;
  font-family:Consolas,"Courier New",monospace;
  background:var(--code);padding:2px 6px;border-radius:5px;
  font-size:.9em;color:#334155;
}
.callout{
  margin:25px 0;padding:17px 19px;
  background:#eff6ff;border-right:4px solid var(--primary);
  border-radius:10px;
}
.callout strong{color:#1e3a8a}
.layer-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0;
}
.layer-card{
  border:1px solid var(--border);border-radius:12px;padding:18px;
  background:#fff;position:relative;overflow:hidden;
}
.layer-card::before{
  content:"";position:absolute;top:0;right:0;left:0;height:4px;
  background:var(--primary);
}
.layer-card:nth-child(2)::before{background:var(--amber)}
.layer-card:nth-child(3)::before{background:var(--red)}
.layer-card .layer-kicker{
  direction:ltr;font-size:.72rem;font-weight:800;letter-spacing:.8px;color:var(--muted);
}
.layer-card h3{margin-top:4px}
.layer-card p{font-size:.9rem;margin:0;color:var(--muted)}
.decision-list{display:grid;gap:14px}
.decision{
  background:#f8fafc;border:1px solid var(--border);
  border-right:4px solid var(--primary);border-radius:11px;padding:18px 20px;
}
.decision p{margin:0}
.flow-badge{
  display:inline-block;padding:3px 8px;border-radius:999px;
  font-size:.74rem;font-weight:800;direction:ltr;
  background:#f1f5f9;color:#475569;
}
footer{text-align:center;color:var(--muted);padding:30px 20px;font-size:.88rem}
@media(max-width:950px){
  .hero-metrics{grid-template-columns:repeat(2,1fr)}
  .container{padding:18px 24px 45px}
  .layer-grid{grid-template-columns:1fr}
}
@media(max-width:680px){
  .hero{padding:40px 18px}
  .hero h1{font-size:1.75rem}
  .hero h1 span{font-size:1.05rem}
  .hero-metrics{grid-template-columns:1fr 1fr}
  .container{margin:0;padding:12px 18px 30px;border-radius:0;border-left:0;border-right:0}
  section{padding:31px 0}
  h2{font-size:1.28rem}
  .diagram-card{padding:12px}
  .portal-back{left:10px;bottom:10px}
}