:root{
  --bg: #0f1724;
  --card: #0b1220;
  --muted: #9aa5b1;
  --accent: #6ee7b7;
  --accent-2: #60a5fa;
  --text: #e6eef3;
  --radius: 12px;
  --maxw: 1200px;

  /* اندازه لوگو را اینجا عوض کن */
  --logo-size: 56px;
}

/* پایه */
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:'Vazirmatn',system-ui,-apple-system,"Segoe UI",Roboto,Arial;color:var(--text);background:linear-gradient(180deg,var(--bg), #071023 120%)}
.container{width:calc(100% - 32px);max-width:var(--maxw);margin:0 auto;padding:18px 0}

/* هدر */
.site-header{
  position:sticky;top:0;z-index:60;background:linear-gradient(180deg, rgba(8,12,20,0.6), rgba(8,12,20,0.25));
  border-bottom:1px solid rgba(255,255,255,0.03);backdrop-filter: blur(6px);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text)}
.brand-logo{width:var(--logo-size);height:var(--logo-size);object-fit:contain;border-radius:8px;background:rgba(255,255,255,0.02);padding:6px;flex-shrink:0}
.brand-title{font-weight:700;font-size:16px;letter-spacing:0.2px}

/* منو */
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:14px;align-items:center}
.nav a{color:var(--muted);text-decoration:none;padding:8px 12px;border-radius:8px;transition:all 200ms}
.nav a:hover{color:var(--text);background:rgba(255,255,255,0.02)}

/* header actions */
.header-actions{display:flex;align-items:center;gap:8px}

/* موبایل toggle */
.mobile-toggle{display:none;width:44px;height:44px;border-radius:8px;border:0;background:transparent;padding:8px;cursor:pointer}
.mobile-toggle span{display:block;height:2px;background:var(--text);margin:6px 0;border-radius:2px;opacity:.9}

/* hero */
.hero{padding:44px 0}
.hero-inner{display:flex;gap:20px;align-items:center}
.hero-left{flex:1}
.hero-right{width:360px}
.card-sample{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:16px;border-radius:12px;box-shadow:0 8px 30px rgba(2,6,23,0.6)}
.card-thumb{height:120px;border-radius:8px;background:rgba(255,255,255,0.02);display:flex;align-items:center;justify-content:center;color:var(--muted);margin-bottom:12px}

/* بخش‌ها */
.section{padding:40px 0}
.section.alt{background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent)}
.section-title{font-size:22px;margin:0 0 18px}

/* دکمه‌ها */
.btn{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:10px;border:1px solid rgba(255,255,255,0.05);text-decoration:none;color:inherit;cursor:pointer;transition:all 200ms}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#02111a;font-weight:700;border:0}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,0.04)}
.btn.small{padding:6px 10px;font-size:14px}

/* footer */
.site-footer{border-top:1px solid rgba(255,255,255,0.03);padding:18px 0;margin-top:30px;background:transparent}
.footer-inner{display:flex;justify-content:space-between;align-items:center}

/* مودال */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.6);z-index:100}
.modal.hidden{display:none}
.modal-content{background:var(--card);padding:24px;border-radius:12px;width:min(92%,420px);position:relative;box-shadow:0 10px 30px rgba(0,0,0,0.7)}
.modal-close{position:absolute;top:12px;right:12px;background:transparent;border:0;font-size:24px;color:var(--muted);cursor:pointer}
.auth-form label{display:block;margin-bottom:12px}
.auth-form input{width:100%;padding:10px;border-radius:8px;border:1px solid rgba(255,255,255,0.03);background:transparent;color:var(--text)}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}
.form-msg{margin-top:10px;color:var(--accent)}

/* responsive */
@media (max-width:980px){
  .hero-inner{flex-direction:column}
  .hero-right{width:100%}
}

/* موبایل: کمپکت کردن هدر و نمایش دکمه منو */
@media (max-width:720px){
  .brand-title{display:none}
  .nav{display:none}
  .mobile-toggle{display:block}
  .brand-logo{width:calc(var(--logo-size) - 12px);height:calc(var(--logo-size) - 12px)}
}

/* وقتی منو باز شد در موبایل */
.nav.open{
  display:block;
  position:fixed;
  top:70px;
  right:16px;
  left:16px;
  background:linear-gradient(180deg,#071124,#061321);
  padding:12px;
  border-radius:12px;
  box-shadow:0 20px 50px rgba(0,0,0,0.6);
}
.nav.open ul{flex-direction:column;gap:8px}