/* Birok Landing — RTL Persian, modern, responsive, dark-mode aware */
:root{
  --bg:#f4f6fb; --surface:#ffffff; --ink:#0f1e3d; --muted:#5b6b8c;
  --brand:#1e40af; --brand2:#0d9488; --line:#e3e9f4;
  --blue:#dbeafe; --orange:#ffedd5; --green:#dcfce7;
  --grad:linear-gradient(120deg,#1e3a9e 0%,#2f6bed 55%,#0d9488 100%);
  --shadow:0 12px 40px rgba(15,30,61,.10);
  --radius:20px;
  --font:"Inter","Segoe UI",system-ui,-apple-system,Arial,sans-serif;
}
[data-theme="dark"]{
  --bg:#0b1226; --surface:#131d36; --ink:#eaf0ff; --muted:#9aa8c7;
  --line:#22304f; --blue:#1c2c55; --orange:#3a2c14; --green:#123626;
  --shadow:0 12px 40px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.9}
img{max-width:100%;display:block}
code{background:rgba(127,140,170,.18);padding:1px 7px;border-radius:8px;font-size:.85em}
.container{width:min(1160px,92%);margin-inline:auto}
a{color:inherit}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:16px;padding:10px 0}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-width:0}
.brand img{width:40px;height:40px;object-fit:contain;flex-shrink:0}
.brand span{display:flex;flex-direction:column;line-height:1.3;min-width:0}
.brand b{white-space:nowrap}
.brand small{color:var(--muted);font-size:11px}
.nav{display:flex;gap:16px;margin-inline-start:auto;font-size:14.5px}
.nav a{text-decoration:none;color:var(--muted);white-space:nowrap}
.nav a:hover{color:var(--ink)}
.header-actions{display:flex;align-items:center;gap:8px}
.header-actions .btn-brand{white-space:nowrap;flex-shrink:0}
.theme-btn,.menu-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:8px 11px;cursor:pointer}
.menu-btn{display:none}

/* Buttons & pills */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;border-radius:14px;padding:10px 20px;font-weight:700;border:1px solid transparent;cursor:pointer;font-size:15px}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{filter:brightness(1.08)}
.btn-line{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-lg{padding:13px 26px;font-size:16px}
.pill{display:inline-block;background:var(--blue);color:var(--ink);border-radius:999px;padding:3px 13px;font-size:12.5px;font-weight:700}
.pill.orange{background:var(--orange)}
.pill.green{background:var(--green)}
.pill.blue{background:var(--blue)}

/* Hero */
.hero{background:radial-gradient(900px 400px at 85% -10%,rgba(47,107,237,.22),transparent),radial-gradient(700px 380px at 10% 0%,rgba(13,148,136,.18),transparent);padding:56px 0 30px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero-copy h1{font-size:clamp(30px,4.4vw,50px);line-height:1.35;margin:14px 0}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--muted);font-size:17px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}
.hero-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.hero-meta i{width:4px;height:4px;border-radius:50%;background:var(--muted);opacity:.5}
.hero-note{margin-top:12px;font-size:13px;color:var(--muted)}
.hero-shot{position:relative}
.hero-shot img{border-radius:22px;box-shadow:var(--shadow);border:1px solid var(--line)}
.shot-card{position:absolute;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:8px 14px;font-size:13px;font-weight:700;box-shadow:var(--shadow)}
.shot-card.s1{top:-16px;inset-inline-start:18px}
.shot-card.s2{bottom:-16px;inset-inline-end:18px}

/* Strip */
.strip{padding:18px 0}
.strip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.strip-grid>div{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px 16px;font-size:14px;display:flex;flex-direction:column;gap:2px}
.strip-grid small{color:var(--muted)}

/* Sections */
.section{padding:64px 0}
.section.alt{background:color-mix(in srgb,var(--surface) 60%,var(--bg))}
.sec-head{max-width:780px;margin-bottom:30px}
.kicker{display:inline-block;font-size:13px;font-weight:800;color:#fff;background:var(--grad);border-radius:999px;padding:4px 16px;margin-bottom:10px}
.sec-head h2{font-size:clamp(22px,3vw,32px);margin:6px 0;line-height:1.6}
.sec-head p{color:var(--muted)}

/* Books */
.books-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:22px}
.book-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.book-card h3{margin:10px 0 6px}
.book-card small{color:var(--muted);font-weight:400;font-size:13px}
.check{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:8px;color:var(--muted);font-size:14.5px}
.check li::before{content:"✓";display:inline-flex;width:22px;height:22px;border-radius:50%;background:var(--green);color:#166534;font-weight:800;align-items:center;justify-content:center;margin-inline-end:8px;font-size:12px}
.check.big{font-size:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;align-content:start}
.shot{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow)}
.shot img{border-radius:14px;border:1px solid var(--line);width:100%}
.shot figcaption{color:var(--muted);font-size:13px;padding:8px 6px 2px}

/* Steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:12px;padding:0;margin:0 0 26px}
.steps li{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px 12px;text-align:center;display:flex;flex-direction:column;gap:4px}
.steps span{font-size:30px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.ai-grid{align-items:center}

/* Features */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:22px}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px}
.feat h3{margin:0 0 6px;font-size:16px}
.feat p{margin:0;color:var(--muted);font-size:13.5px}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.gallery .shot:last-child{grid-column:span 1}

/* Tech / mini */
.mini-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:18px}
.mini{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:16px 12px;text-align:center;font-size:22px;display:flex;flex-direction:column;gap:4px}
.mini small{color:var(--muted);font-size:12px}
.mini b{font-size:14px}
/* FAQ */
.faq{display:grid;gap:10px;max-width:820px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px 18px}
.faq summary{cursor:pointer;font-weight:800}
.faq p{color:var(--muted);margin:8px 0 0}
.cta-box{margin-top:30px;background:var(--grad);color:#fff;border-radius:24px;padding:40px;text-align:center}
.cta-box p{opacity:.9}
.cta-box .btn{background:#fff;color:var(--brand)}

/* Footer */
.footer{background:#0b1226;color:#c7d3ec;padding:44px 0 20px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:20px}
.footer a{display:block;color:#9fb0d4;text-decoration:none;font-size:14px;margin-top:6px}
.footer a:hover{color:#fff}
.footer code{background:rgba(255,255,255,.12);color:#fff}
.foot-note{border-top:1px solid rgba(255,255,255,.12);margin-top:24px;padding-top:14px;font-size:13px;color:#8fa0c2}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* Responsive */
@media (max-width:1000px){
  .hero-grid,.two-col{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .mini-grid{grid-template-columns:repeat(3,1fr)}
  .strip-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
  .nav{display:none;position:absolute;top:60px;inset-inline:4%;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px;flex-direction:column;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .menu-btn{display:inline-block}
  .header-actions{margin-inline-start:auto;flex-shrink:0}
}
@media (max-width:720px){
  .header-inner{gap:10px}
  .header-inner .btn-brand{padding:8px 14px;font-size:14px;white-space:nowrap;flex-shrink:0}
  .books-grid,.gallery{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .mini-grid{grid-template-columns:repeat(2,1fr)}
  .section{padding:44px 0}
  .shot-card{display:none}
}
@media (max-width:560px){
  .brand img{width:34px;height:34px}
  .brand small{display:none}
  .header-inner .btn-brand{padding:8px 12px;font-size:13px}
  .theme-btn,.menu-btn{padding:7px 9px}
}