body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #6e8efb, #a777e3, #17ead9);
  background-size: 600% 600%;
  animation: gradientBG 12s ease infinite;
  color: #fff;
  text-align: center;
  transition: all 0.3s ease;
}
@keyframes gradientBG {0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
main{padding:50px 20px}
.avatar{width:150px;height:150px;border-radius:50%;border:5px solid rgba(255,255,255,0.8);box-shadow:0 0 25px rgba(255,255,255,0.9);}
h1{margin:18px 0 6px;font-size:28px;font-weight:700}
.bio{margin:6px 0 28px;font-size:17px;opacity:0.95;padding:0 12px}
.link-btn{display:flex;align-items:center;justify-content:center;gap:12px;width:92%;max-width:420px;margin:12px auto;padding:14px 18px;background:rgba(255,255,255,0.25);border-radius:35px;font-size:18px;color:#fff;text-decoration:none;transition:transform .18s ease,background .18s ease,box-shadow .18s ease;box-shadow:0 5px 12px rgba(0,0,0,0.18);}
.link-btn:hover{background:rgba(255,255,255,0.35);transform:translateY(-4px) scale(1.01);box-shadow:0 10px 22px rgba(0,0,0,0.25)}
.icon{width:28px;height:28px;margin-right:6px;display:inline-block}
.promo-section{margin:32px 0;display:flex;justify-content:center;gap:18px;flex-wrap:wrap}
.promo-section img{width:200px;height:auto;border-radius:12px;box-shadow:0 6px 18px rgba(0,0,0,0.18);transition:transform .25s ease,box-shadow .25s ease}
.promo-section img:hover{transform:scale(1.03);box-shadow:0 12px 28px rgba(0,0,0,0.25)}
.lang-footer{margin:40px 0 15px}
.lang-switch{font-size:16px;margin-bottom:10px}
.lang-switch a{color:#fff;margin:0 8px;text-decoration:underline;opacity:0.9}
footer{font-size:14px;opacity:0.8}
body.dark{background:#121212;color:#eaeef6}
body.dark .link-btn{background:rgba(255,255,255,0.06);color:#e9eef8}
.theme-toggle{position:fixed;top:14px;right:16px;cursor:pointer;font-size:18px;padding:8px 10px;border-radius:10px;background:rgba(255,255,255,0.16);color:#fff;user-select:none;z-index:1200}
.theme-toggle:hover{transform:translateY(-2px);background:rgba(255,255,255,0.28)}