/* Sina School — Glassmorphism / RTL / Vazirmatn */
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:"Vazirmatn","Vazirmatn FD",Tahoma,sans-serif;
  direction:rtl;min-height:100vh;color:#1e293b;
  background:linear-gradient(135deg,#e0e7ff 0%,#f0f9ff 50%,#fce7f3 100%);
}
.glass{
  background:rgba(255,255,255,.55);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.6);
  border-radius:18px;box-shadow:0 8px 32px rgba(31,41,55,.12);
}
.glass-bg{position:fixed;inset:0;z-index:-1;overflow:hidden}
.glass-bg span{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5}
.glass-bg span:nth-child(1){width:420px;height:420px;background:#818cf8;top:-80px;right:-80px}
.glass-bg span:nth-child(2){width:360px;height:360px;background:#f472b6;bottom:-60px;left:-60px}
.glass-bg span:nth-child(3){width:300px;height:300px;background:#38bdf8;top:40%;left:30%}
.glass-nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;margin:1rem;position:sticky;top:1rem;z-index:10}
.glass-nav h1{font-size:1.4rem;font-weight:800;color:#4338ca}
.glass-nav nav a{margin-inline-start:1rem;text-decoration:none;color:#334155;font-weight:600}
.glass-nav nav a:hover{color:#4338ca}
.glass-main{max-width:960px;margin:1.5rem auto;padding:2rem}
.glass-footer{max-width:960px;margin:1rem auto;padding:1rem;text-align:center;font-size:.85rem;color:#475569}
form{display:flex;flex-direction:column;gap:1rem;max-width:400px;margin-inline:auto}
input,button{font-family:inherit;padding:.7rem 1rem;border-radius:12px;border:1px solid rgba(255,255,255,.7);background:rgba(255,255,255,.6);outline:none}
input:focus{border-color:#6366f1;box-shadow:0 0 0 3px rgba(99,102,241,.2)}
button{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;border:none;cursor:pointer;font-weight:700}
button:hover{opacity:.9}
.flash{padding:.8rem 1rem;border-radius:12px;margin-bottom:1rem;background:rgba(99,102,241,.15);color:#3730a3}
h2,h3{color:#4338ca;margin-bottom:1rem}