:root{
  --bg:#0B0D12; --bg-2:#11141C; --card:rgba(255,255,255,.045); --card-2:rgba(255,255,255,.07);
  --border:rgba(255,255,255,.09); --border-strong:rgba(255,255,255,.18);
  --text:#F2F4F8; --muted:#98A1B3; --accent:#E5484D; --accent-2:#F59E0B;
  --accent-soft:rgba(229,72,77,.14); --warn:#FBBF24; --ok:#4ADE80;
  --grad:linear-gradient(135deg,#E5484D,#F59E0B);
  --radius-sm:10px; --radius:16px; --radius-lg:22px;
  --shadow:0 4px 24px rgba(0,0,0,.35); --shadow-lg:0 16px 48px rgba(0,0,0,.5);
  --icon-sm:16px; --icon-md:20px; --icon-lg:24px;
  --font-head:'Noto Naskh Arabic',serif; --font-body:'Noto Sans Arabic',system-ui,sans-serif;
}
body.light{
  --bg:#F6F7F9; --bg-2:#FFFFFF; --card:#FFFFFF; --card-2:#F1F3F7;
  --border:#E3E7EE; --border-strong:#CFD6E2;
  --text:#12141A; --muted:#5A6478; --accent:#C2181D; --accent-2:#B45309;
  --accent-soft:rgba(194,24,29,.08); --shadow:0 4px 18px rgba(15,23,42,.07);
  --shadow-lg:0 16px 40px rgba(15,23,42,.12);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--text); font-family:var(--font-body);
  font-weight:400; line-height:1.75; min-height:100dvh; overflow-x:hidden;
  -webkit-font-smoothing:antialiased; transition:background .3s,color .3s;
}
h1,h2,h3,h4,.footer-title{font-family:var(--font-head);line-height:1.35;font-weight:600}
h1{font-size:clamp(2rem,5vw,3.1rem);letter-spacing:-.01em}
h2{font-size:clamp(1.5rem,3.2vw,2.1rem)}
h3{font-size:1.1rem}
p{max-width:70ch}
a{color:inherit}
em{color:var(--accent);font-style:normal;font-weight:700}
.glow{
  position:fixed;inset:-35% -20% auto -20%;height:70vh;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse at 50% 0%,rgba(229,72,77,.25),transparent 62%);
}
body.light .glow{background:radial-gradient(ellipse at 50% 0%,rgba(194,24,29,.12),transparent 60%)}
.section{max-width:1120px;margin:0 auto;padding:4rem 1.5rem;position:relative;z-index:1}
.section-head{margin-bottom:2.2rem}
.eyebrow{display:inline-flex;align-items:center;gap:.4rem;font-size:.72rem;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem}
.lead{color:var(--muted);font-size:1.05rem;margin-top:.7rem}
.muted{color:var(--muted);font-size:.9rem}
.hint{color:var(--muted);font-size:.8rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;cursor:pointer;
  padding:.7rem 1.5rem;border-radius:999px;font-family:var(--font-body);font-size:.9rem;
  font-weight:700;border:none;text-decoration:none;min-height:44px;
  transition:transform .15s ease,box-shadow .15s ease,opacity .2s,background .2s;
}
.btn svg{width:var(--icon-sm);height:var(--icon-sm)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 26px rgba(229,72,77,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(229,72,77,.42)}
.btn-ghost{background:transparent;color:var(--text);border:1.5px solid var(--border-strong)}
.btn-ghost:hover{background:var(--card-2);transform:translateY(-2px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.badge{display:inline-flex;align-items:center;gap:.3rem;font-size:.72rem;font-weight:700;
  padding:.25rem .7rem;border-radius:999px;background:var(--accent-soft);color:var(--accent)}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  backdrop-filter:blur(12px);box-shadow:var(--shadow);padding:1.6rem;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--border-strong)}
.card-icon{
  width:44px;height:44px;display:grid;place-items:center;border-radius:14px;
  background:var(--accent-soft);color:var(--accent);margin-bottom:1rem;
}
.card-icon svg{width:var(--icon-lg);height:var(--icon-lg)}
.card-icon.warn{background:rgba(251,191,36,.14);color:var(--warn)}
.card h3{margin-bottom:.5rem}
.card p{color:var(--muted);font-size:.95rem}
.grid{display:grid;gap:1.25rem}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{padding:.85rem .9rem;text-align:right;border-bottom:1px solid var(--border)}
th{font-family:var(--font-head);font-size:.95rem;color:var(--text);background:var(--card-2)}
td{color:var(--muted)}
td.hl{color:var(--text);font-weight:700}
.table-wrap{padding:0;overflow-x:auto}
.table-wrap table{min-width:600px}
tbody tr:hover td{background:var(--card-2)}
.navbar{
  position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:1rem;
  padding:.7rem 1.5rem;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--border);
}
body.light .navbar{background:rgba(246,247,249,.85)}
.nav-logo{display:flex;align-items:center;gap:.55rem;font-family:var(--font-head);
  font-weight:700;font-size:1.05rem;text-decoration:none;cursor:pointer}
.logo-mark{width:32px;height:32px;display:grid;place-items:center;border-radius:10px;
  background:var(--grad);color:#fff;font-size:.95rem}
.nav-links{display:flex;gap:1.4rem;margin-inline-start:auto}
.nav-link{color:var(--muted);font-size:.9rem;font-weight:500;text-decoration:none;
  transition:color .2s;cursor:pointer;position:relative;padding:.3rem 0}
.nav-link::after{content:"";position:absolute;inset-inline:0;bottom:0;height:2px;
  background:var(--accent);transform:scaleX(0);transition:transform .25s}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1)}
.icon-btn{
  width:44px;height:44px;display:grid;place-items:center;border-radius:12px;cursor:pointer;
  background:var(--card);border:1px solid var(--border);color:var(--text);
  transition:background .2s,transform .15s,border-color .2s;
}
.icon-btn:hover{background:var(--card-2);transform:translateY(-2px);border-color:var(--border-strong)}
.icon-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.icon-btn svg{width:var(--icon-md);height:var(--icon-md)}
.nav-burger{display:none}
.mobile-menu{position:sticky;top:60px;z-index:19;display:flex;flex-direction:column;
  background:var(--bg-2);border-bottom:1px solid var(--border);padding:.5rem 1.5rem}
.mobile-menu a{padding:.8rem 0;color:var(--muted);text-decoration:none;font-weight:600;
  border-bottom:1px solid var(--border)}
.mobile-menu a:last-child{border-bottom:none}

.hero{text-align:center;padding-top:4.5rem}
.hero h1{margin:1rem 0}
.hero p{margin:0 auto;color:var(--muted);font-size:1.08rem}
.hero-badge{display:inline-flex;align-items:center;gap:.4rem;font-size:.75rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
  background:var(--accent-soft);padding:.35rem .9rem;border-radius:999px}
.hero-badge svg{width:var(--icon-sm);height:var(--icon-sm)}
.hero-actions{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-top:1.8rem}
.hero-figure{margin:2.5rem auto 0;max-width:280px}
.orbit{width:100%;height:auto}
.orbit-track{fill:none;stroke:var(--border-strong);stroke-width:1.5;stroke-dasharray:6 7}
.orbit-nodes circle{fill:var(--accent);opacity:.35;animation:nodePulse 4s ease-in-out infinite}
.orbit-nodes circle:nth-child(2){animation-delay:.4s}
.orbit-nodes circle:nth-child(3){animation-delay:.8s}
.orbit-nodes circle:nth-child(4){animation-delay:1.2s}
.orbit-nodes circle:nth-child(5){animation-delay:1.6s}
.orbit-nodes circle:nth-child(6){animation-delay:2s}
.orbit-label{fill:var(--text);font-family:var(--font-head);font-size:15px;text-anchor:middle}
.orbit-label.dim{fill:var(--muted);font-size:11px}
@keyframes nodePulse{0%,100%{opacity:.3;r:7}50%{opacity:1;r:9.5}}

.bento{display:grid;gap:1.25rem;grid-template-columns:repeat(6,1fr)}
.bento>*{grid-column:span 2}
.card.bento-lg{grid-column:span 6;background:linear-gradient(135deg,var(--accent-soft),transparent 65%)}
.grid-2{display:grid}

.loop-wrap{padding:1.4rem}
.loop-steps{display:flex;gap:.4rem;flex-wrap:wrap;justify-content:center}
.loop-step{
  cursor:pointer;border:1px solid var(--border);background:var(--card);color:var(--muted);
  font-family:var(--font-body);font-size:.85rem;font-weight:700;padding:.55rem 1rem;
  border-radius:999px;min-height:44px;transition:all .2s;
}
.loop-step:hover{color:var(--text);border-color:var(--border-strong)}
.loop-step.active{background:var(--grad);color:#fff;border-color:transparent;
  box-shadow:0 8px 22px rgba(229,72,77,.3)}
.loop-bar{height:4px;background:var(--card-2);border-radius:999px;margin:1.4rem 0;overflow:hidden}
.loop-bar span{display:block;height:100%;width:16.6%;background:var(--grad);
  border-radius:999px;transition:width .35s cubic-bezier(.16,1,.3,1)}
.loop-panel{min-height:230px}
.loop-panel h3{font-size:1.35rem;margin-bottom:.6rem}
.loop-panel p{color:var(--muted)}
.loop-panel .note{font-size:.85rem;color:var(--muted);margin-top:.9rem;
  border-inline-start:3px solid var(--accent);padding-inline-start:.8rem}
.loop-nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;
  margin-top:1.5rem;padding-top:1.2rem;border-top:1px solid var(--border)}
.loop-count{font-size:.85rem;color:var(--muted);font-weight:700}
.code{
  direction:ltr;text-align:left;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.82rem;line-height:1.65;background:var(--bg-2);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:1rem;margin-top:1.1rem;color:#9FE8C0;
  white-space:pre-wrap;word-break:break-word;overflow-x:auto;
}
body.light .code{color:#0F5132}
.code:empty{display:none}
.tabs{display:flex;gap:.3rem;background:var(--card-2);border:1px solid var(--border);
  border-radius:999px;padding:.3rem;margin-bottom:1.5rem;flex-wrap:wrap}
.tab{flex:1;min-width:130px;min-height:44px;text-align:center;padding:.5rem 1rem;border-radius:999px;
  font-family:var(--font-body);font-size:.88rem;font-weight:700;cursor:pointer;color:var(--muted);
  background:transparent;border:none;transition:all .2s}
.tab:hover{color:var(--text)}
.tab.active{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(229,72,77,.28)}
.sim-flow{display:grid;gap:.9rem;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.pane{background:var(--bg-2);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:1rem;opacity:.35;transform:translateY(8px);transition:opacity .35s,transform .35s,border-color .35s}
.pane.on{opacity:1;transform:none;border-color:var(--border-strong)}
.pane-head{display:flex;align-items:center;gap:.5rem;font-size:.8rem;font-weight:700;
  color:var(--accent);text-transform:uppercase;letter-spacing:.08em;margin-bottom:.6rem}
.pane-head svg{width:var(--icon-sm);height:var(--icon-sm)}
.pane-body{font-size:.9rem;color:var(--muted);white-space:pre-wrap;word-break:break-word}
.pane-body.mono{direction:ltr;text-align:left;font-family:ui-monospace,Menlo,monospace;font-size:.8rem;
  color:var(--text);line-height:1.6}
.sim-actions{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-top:1.5rem}

.quiz-card{padding:1.6rem}
.quiz-progress{height:5px;background:var(--card-2);border-radius:999px;overflow:hidden;margin-bottom:1.4rem}
.quiz-progress span{display:block;height:100%;width:0;background:var(--grad);transition:width .35s}
.q-text{font-family:var(--font-head);font-size:1.2rem;font-weight:600;margin-bottom:1rem}
.q-options{display:grid;gap:.6rem}
.q-opt{
  display:flex;align-items:center;gap:.7rem;text-align:right;cursor:pointer;min-height:48px;
  background:var(--card-2);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:.85rem 1rem;font-family:var(--font-body);font-size:.95rem;color:var(--text);
  transition:all .2s;
}
.q-opt:hover:not(:disabled){border-color:var(--accent);transform:translateX(-4px)}
.q-opt:disabled{cursor:default}
.q-opt svg{width:var(--icon-md);height:var(--icon-md);flex-shrink:0;color:var(--muted)}
.q-opt.right{border-color:var(--ok);background:rgba(74,222,128,.1)}
.q-opt.right svg{color:var(--ok)}
.q-opt.wrong{border-color:var(--accent);background:var(--accent-soft)}
.q-opt.wrong svg{color:var(--accent)}
.q-explain{margin-top:1rem;font-size:.9rem;color:var(--muted);
  border-inline-start:3px solid var(--accent);padding-inline-start:.8rem}
.quiz-result{text-align:center;padding:1rem 0}
.score-ring{width:110px;height:110px;margin:0 auto 1rem;border-radius:50%;display:grid;
  place-items:center;background:var(--accent-soft);border:2px solid var(--accent);
  font-family:var(--font-head)}
.score-ring span{font-size:2rem;font-weight:700;line-height:1}
.score-ring small{font-size:.72rem;color:var(--muted)}
.quiz-result p{color:var(--muted);margin:0 auto 1.2rem}

.toast-wrap{position:fixed;bottom:1.5rem;inset-inline-end:1.5rem;z-index:100;display:flex;
  flex-direction:column;gap:.5rem;max-width:90vw}
.toast{display:flex;align-items:center;gap:.5rem;padding:.8rem 1.2rem;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:600;box-shadow:var(--shadow-lg);background:var(--bg-2);
  border:1px solid var(--border-strong);animation:toastIn .3s cubic-bezier(.16,1,.3,1)}
.toast svg{width:var(--icon-sm);height:var(--icon-sm)}
.toast.success{border-color:rgba(74,222,128,.5);color:var(--ok)}
.toast.error{border-color:rgba(229,72,77,.5);color:var(--accent)}
.toast.info{border-color:var(--border-strong);color:var(--text)}
@keyframes toastIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

.footer{margin-top:3rem;border-top:1px solid var(--border);background:var(--bg-2);
  padding:2.5rem 1.5rem;position:relative;z-index:1}
.footer-inner{max-width:1120px;margin:0 auto;display:flex;justify-content:space-between;
  gap:2.5rem;flex-wrap:wrap}
.footer-title{font-size:1.15rem;margin-bottom:.4rem}
.footer-meta{text-align:start;font-size:.9rem}
.footer-meta a{color:var(--accent);font-weight:700;text-decoration:none}
.footer-meta a:hover{text-decoration:underline}

.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:900px){
  .bento{grid-template-columns:repeat(4,1fr)}
  .bento>*{grid-column:span 2}
  .card.bento-lg{grid-column:span 4}
}
@media (max-width:640px){
  .nav-links{display:none}
  .nav-burger{display:grid}
  .navbar{padding:.6rem 1rem}
  .section{padding:3rem 1.1rem}
  .bento{grid-template-columns:1fr}
  .bento>*,.card.bento-lg{grid-column:span 1}
  .loop-nav{flex-direction:column-reverse;align-items:stretch}
  .loop-nav .btn{width:100%}
  .toast-wrap{inset-inline-end:.75rem;bottom:.75rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ── icon fallback (library unreachable) ────────────────── */
body.no-icons .card-icon,
body.no-icons .hero-badge i,
body.no-icons .pane-head i,
body.no-icons .btn i,
body.no-icons .tab i,
body.no-icons .q-opt i,
body.no-icons .toast i,
body.no-icons .icon-btn i,
body.no-icons .loop-nav i{display:none}
body.no-icons .card{border-inline-start:3px solid var(--accent)}
body.no-icons .pane-head::before,
body.no-icons .hero-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent)}
body.no-icons .toast{padding-inline-start:1.2rem}
body.no-icons .tab{min-width:110px}