:root{
  --indigo:#4F46E5;--violet:#7C3AED;--mint:#34D399;--yellow:#FBBF24;
  --bg:#F8FAFF;--text:#172033;--muted:#4B5873;--line:#DCE2F3;--surface:#fff;
  --deep:#1E1B4B;--err:#B00020;--ok:#0B6B49;
  --r:18px;--shadow:0 6px 20px rgba(23,32,51,.07);--shadow-up:0 12px 28px rgba(79,70,229,.16);
  --grad:linear-gradient(135deg,var(--indigo),var(--violet));
  --ease:.18s ease;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;position:relative;font-family:Vazirmatn,Tahoma,system-ui,sans-serif;color:var(--text);background:var(--bg);line-height:1.95;overflow-x:clip}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.5;margin:0 0 .6em}
h1{font-size:clamp(1.9rem,5.4vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.5rem,3.6vw,2.1rem);font-weight:800}
h3{font-size:1.1rem}
p{margin:0 0 1em}
.muted{color:var(--muted)}
.pre{white-space:pre-line}
.skip{position:absolute;inset-inline-start:8px;top:-70px;background:var(--text);color:#fff;padding:8px 14px;z-index:100;border-radius:8px}
.skip:focus{top:8px}
:focus-visible{outline:3px solid var(--violet);outline-offset:3px;border-radius:6px}
.sentinel{position:absolute;top:0;inset-inline-start:0;width:1px;height:16px;pointer-events:none}
.sentinel-far{top:560px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:#F8FAFF;border-bottom:1px solid transparent;transition:box-shadow var(--ease),border-color var(--ease)}
@supports ((backdrop-filter:blur(8px)) or (-webkit-backdrop-filter:blur(8px))){
  .site-header{background:rgba(248,250,255,.8);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
}
.site-header.scrolled{border-color:var(--line);box-shadow:0 4px 16px rgba(23,32,51,.08)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.mark{transition:transform var(--ease)}
.scrolled .mark{transform:scale(.88)}
.brand-text{font-weight:900;font-size:1.4rem;letter-spacing:0}
.nav{display:flex;gap:4px}
.nav a{padding:6px 12px;border-radius:999px;color:var(--text);text-decoration:none;font-size:.95rem;transition:background var(--ease),color var(--ease)}
.nav a:hover{background:#ECEEFF;color:var(--indigo)}
.nav a[aria-current=true]{background:#E4E3FF;color:#3730A3;font-weight:700}
.menu-btn{display:none;font:inherit;padding:6px 16px;border:1.5px solid var(--indigo);color:#3730A3;background:#fff;border-radius:10px;cursor:pointer}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;font:inherit;font-weight:700;min-height:46px;padding:0 24px;border-radius:12px;border:2px solid transparent;text-decoration:none;cursor:pointer;transition:box-shadow var(--ease),background var(--ease),border-color var(--ease),transform var(--ease)}
.btn.primary{background:var(--grad);color:#fff;box-shadow:0 6px 16px rgba(79,70,229,.28)}
.btn.primary:hover{box-shadow:0 8px 22px rgba(124,58,237,.38);transform:translateY(-1px)}
.btn.primary:active{transform:translateY(0);box-shadow:0 3px 8px rgba(79,70,229,.3)}
.btn.ghost{background:#fff;color:#3730A3;border-color:#B9B6F5}
.btn.ghost:hover{border-color:var(--indigo);background:#F1F0FF}
.btn.ghost:active{background:#E4E3FF}
.btn:focus-visible{outline:3px solid var(--violet);outline-offset:3px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}

/* hero */
.hero{position:relative;overflow:clip;padding:56px 0 72px;
  background:
    radial-gradient(600px 320px at 85% 10%,rgba(124,58,237,.14),transparent 70%),
    radial-gradient(520px 300px at 10% 90%,rgba(52,211,153,.16),transparent 70%),
    radial-gradient(480px 260px at 20% 0%,rgba(79,70,229,.1),transparent 70%),var(--bg)}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(79,70,229,.16) 1px,transparent 1.2px);background-size:24px 24px;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 85%);mask-image:linear-gradient(180deg,#000,transparent 85%)}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.eyebrow{display:inline-block;margin:0 0 14px;padding:4px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#3730A3;font-weight:700;font-size:.9rem}
.eyebrow::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--yellow);margin-inline-end:8px}
.grad{color:var(--indigo)}
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
}
.lead{max-width:56ch;font-size:1.08rem;color:var(--muted)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 14px}
.byline{color:var(--muted);font-size:.95rem;margin:0}
.hero-visual{position:relative;padding:28px 10px}
.halo{position:absolute;inset:8% 6%;border-radius:50%;background:radial-gradient(circle,rgba(124,58,237,.3),rgba(52,211,153,.18) 60%,transparent 72%);filter:blur(24px);pointer-events:none}
.editor{position:relative;background:#1E1B4B;border-radius:var(--r);box-shadow:0 20px 44px rgba(30,27,75,.3);overflow:hidden;color:#E0E7FF;text-align:left}
.editor-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;background:#2A2670;font-size:.8rem;color:#C7D2FE}
.editor-bar i{width:10px;height:10px;border-radius:50%;background:#6B66C9}
.editor-bar i:first-child{background:var(--yellow)}
.editor-bar i:nth-child(2){background:var(--mint)}
.editor-bar span{margin-inline-start:auto}
.code{margin:0;padding:18px 20px;font:.92rem/1.8 ui-monospace,Consolas,Menlo,monospace;white-space:pre;overflow:hidden}
.code .k{color:#A5B4FC}.code .f{color:#6EE7B7}.code .s{color:#FDE68A}.code .c{color:#94A3D8}
.typed.typing::after{content:"";display:inline-block;width:7px;height:1em;margin-inline-start:2px;background:#E0E7FF;vertical-align:-2px}
.tag{position:absolute;padding:3px 14px;border-radius:999px;font-weight:700;font-size:.85rem;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line);animation:float 7s ease-in-out infinite}
.tag-a{top:0;inset-inline-end:6%;color:#B45309}
.tag-b{bottom:4px;inset-inline-start:4%;color:#3730A3;animation-delay:-2s}
.tag-c{bottom:14%;inset-inline-end:0;color:#065F46;background:var(--mint);border-color:var(--mint);animation-delay:-4s}
@keyframes float{50%{transform:translateY(-8px)}}

/* sections */
.section{padding:72px 0}
.alt{background:#EEF1FF}
.kicker{display:flex;align-items:center;gap:10px;margin:0 0 8px;color:#3730A3;font-weight:700;font-size:.92rem}
.kicker::before{content:"";width:26px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--indigo),var(--mint))}
.two{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.sub{margin-top:.2em}
.ticks{list-style:none;margin:0;padding:0}
.ticks li{position:relative;padding-inline-start:30px;margin-bottom:12px}
.ticks li::before{content:"✓";position:absolute;inset-inline-start:0;top:3px;width:20px;height:20px;border-radius:50%;background:var(--mint);color:var(--text);font-size:.75rem;font-weight:800;display:grid;place-items:center;line-height:1}
.facts{list-style:none;display:flex;gap:16px;padding:0;margin:20px 0 0;flex-wrap:wrap}
.facts li{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 18px;box-shadow:var(--shadow)}
.facts strong{display:block;font-size:1.5rem;color:#3730A3;line-height:1.5}
.facts span{color:var(--muted);font-size:.9rem}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px;margin-bottom:28px}
.card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px 18px;box-shadow:var(--shadow);transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease)}
.card::before{content:"";position:absolute;top:0;inset-inline:20px;height:4px;border-radius:0 0 4px 4px;background:var(--c,var(--indigo))}
.card:hover,.card:focus-within{transform:translateY(-4px);box-shadow:var(--shadow-up);border-color:var(--c,var(--indigo))}
.card p{margin:0 0 10px;color:var(--muted)}
.card a{color:#3730A3;overflow-wrap:anywhere}
.more{font-weight:700;font-size:.92rem}

.timeline{list-style:none;margin:20px 0 0;padding:0;position:relative}
.timeline::before{content:"";position:absolute;top:8px;bottom:8px;inset-inline-start:8px;width:3px;border-radius:3px;background:linear-gradient(var(--indigo),var(--violet),var(--mint))}
.timeline li{position:relative;padding:0 40px 26px 0;padding-inline:40px 0}
.timeline li::before{content:"";position:absolute;inset-inline-start:0;top:6px;width:19px;height:19px;border-radius:50%;background:var(--c);border:4px solid var(--bg);box-shadow:0 0 0 2px var(--c)}
.timeline p{color:var(--muted);margin:0}

.clist{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;margin:18px 0;outline:none}
.cmt{background:#FFFDF6;border-color:#F3E7BE}
.cmt::before{display:none}
.cmt::after{content:"”";position:absolute;top:2px;inset-inline-end:16px;font-size:3.4rem;line-height:1;color:var(--yellow);opacity:.6}
.cmt-head{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.avatar{width:42px;height:42px;border-radius:50%;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800}
.cmt-name{font-weight:700;display:block;line-height:1.5}
.cmt-meta{color:var(--muted);font-size:.85rem;line-height:1.5}
.stars-view{color:#B45309;font-size:.95rem;margin-bottom:6px}
.cmt p.body{color:var(--text);margin:0}
.pager{display:flex;gap:16px;align-items:center;justify-content:center;margin:8px 0 28px}

.form{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;max-width:660px;margin-top:26px;box-shadow:var(--shadow)}
.form label{display:block;font-weight:700;margin-top:14px;font-size:.95rem}
.form input:not([type=radio]),.form select,.form textarea{width:100%;font:inherit;padding:10px 12px;border:1.5px solid #8E99B5;border-radius:10px;background:#fff;color:var(--text);transition:border-color var(--ease),box-shadow var(--ease)}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--indigo);box-shadow:0 0 0 3px rgba(79,70,229,.25)}
.form input:disabled,.form select:disabled,.form textarea:disabled{background:#F1F3F9;cursor:not-allowed}
.stars{border:0;padding:0;margin:14px 0 0}
.stars legend{font-weight:700;font-size:.95rem;padding:0}
.stars label{display:inline-block;margin:0 0 0 18px;font-weight:400}
.hp{position:absolute;inset-inline-start:-9999px;width:1px;height:1px;overflow:hidden}
.msg{color:var(--err);min-height:1.6em;margin:10px 0 0;font-size:.95rem}
.msg.ok{color:var(--ok)}
.contact-panel{background:linear-gradient(135deg,#EEF0FF,#EAFBF4);border:1px solid var(--line);border-radius:28px;padding:40px 28px}

.faq{max-width:820px}
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:4px 18px;margin-bottom:12px;transition:border-color var(--ease)}
details[open]{border-color:var(--indigo)}
summary{cursor:pointer;font-weight:700;padding:10px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:#3730A3;font-size:1.3rem;line-height:1.4}
details[open] summary::after{content:"−"}
details p{color:var(--muted);margin:0 0 12px}

.site-footer{background:var(--deep);color:#E0E7FF;text-align:center;padding:44px 0 32px}
.site-footer p{margin:0 0 6px}
.foot-brand{font-weight:900;font-size:1.5rem}
.site-footer .small{color:#C7D2FE;font-size:.88rem}

.to-top{position:fixed;bottom:20px;inset-inline-start:20px;width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;text-decoration:none;display:grid;place-items:center;font-size:1.3rem;box-shadow:var(--shadow-up);z-index:40;opacity:0;transform:translateY(12px);visibility:hidden;transition:opacity var(--ease),transform var(--ease),visibility var(--ease)}
.to-top.show{opacity:1;transform:none;visibility:visible}

/* reveal (only when JS is ready and motion is allowed) */
.reveal{transition:opacity .6s ease,transform .6s ease}
@media (prefers-reduced-motion:no-preference){
  .reveal-on .reveal:not(.in){opacity:0;transform:translateY(16px)}
}

@media (max-width:900px){
  .hero-grid,.two{grid-template-columns:1fr}
  .section{padding:56px 0}
  .js .menu-btn{display:block}
  .js .nav{display:none;position:absolute;top:64px;inset-inline:0;flex-direction:column;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 14px;box-shadow:0 10px 20px rgba(23,32,51,.08)}
  .js .nav.open{display:flex}
  .nav{flex-wrap:wrap}
  .nav a{padding:10px 12px}
}
@media (max-width:600px){
  .hero{padding:36px 0 48px}
  .tag,.halo{display:none}
  .hero-visual{padding:0}
  .code{font-size:.8rem;padding:14px}
  .contact-panel{padding:28px 16px;border-radius:22px}
  .form{padding:18px}
  .actions .btn{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}