:root{
  --blue:#2f6fff;
  --blue-light:#5b8dff;
  --blue-dark:#1c4fd6;
  --dark:#11151f;
  --bg:#0b0d13;
  --bg-soft:#0e1119;
  --card:#161a24;
  --card-hover:#1b2030;
  --border:#242a38;
  --text:#f1f4fa;
  --muted:#8b94a7;
  --green:#2ecc71;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:'Segoe UI',system-ui,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--blue-light);text-decoration:none;transition:color .15s;}
nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  background:rgba(17,21,31,0.9);
  backdrop-filter:blur(8px);
  padding:14px 28px;
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:100;
  box-shadow:0 2px 20px rgba(0,0,0,0.25);
}
.nav-left{display:flex;align-items:center;gap:10px;}
.nav-left img{width:36px;height:36px;filter:drop-shadow(0 0 8px rgba(47,111,255,0.5));}
.nav-left span{font-weight:800;font-size:21px;letter-spacing:-0.3px;
  background:linear-gradient(90deg,#5b8dff,#2f6fff);
  -webkit-background-clip:text;background-clip:text;color:transparent;}
.nav-links{display:flex;gap:26px;}
.nav-links a{color:var(--text);font-weight:500;font-size:14.5px;opacity:0.85;}
.nav-links a:hover{color:var(--blue-light);opacity:1;}
.nav-right{display:flex;gap:10px;align-items:center;}
.btn{
  background:linear-gradient(135deg,var(--blue-light),var(--blue-dark));
  color:#fff;
  padding:9px 18px;
  border-radius:8px;
  border:none;
  cursor:pointer;
  font-weight:700;
  font-size:14px;
  box-shadow:0 4px 14px rgba(47,111,255,0.35);
  transition:transform .15s, box-shadow .15s;
}
.btn.secondary{
  background:transparent;
  border:1px solid var(--border);
  color:var(--text);
  box-shadow:none;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(47,111,255,0.45);}
.btn.secondary:hover{border-color:var(--blue-light);color:var(--blue-light);}
.container{max-width:1150px;margin:0 auto;padding:36px 22px;}
.hero{
  text-align:center;
  padding:90px 20px 70px;
  background:
    radial-gradient(ellipse 700px 400px at 50% 0%, rgba(47,111,255,0.25), transparent),
    linear-gradient(180deg,#131829,var(--bg));
  border-bottom:1px solid var(--border);
}
.hero h1{
  font-size:50px;
  font-weight:800;
  letter-spacing:-1px;
  margin-bottom:14px;
  background:linear-gradient(95deg,#ffffff,#9fb8ff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{color:var(--muted);font-size:18px;max-width:520px;margin:0 auto;}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:22px;
  margin-top:30px;
}
.card{
  background:var(--card);
  border-radius:14px;
  overflow:hidden;
  border:1px solid var(--border);
  transition:transform .18s, border-color .18s, box-shadow .18s;
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--blue);
  box-shadow:0 12px 28px rgba(47,111,255,0.18);
  background:var(--card-hover);
}
.card img{width:100%;height:130px;object-fit:cover;background:linear-gradient(135deg,#1a2033,#222943);}
.card .info{padding:14px;}
.card h3{margin:0 0 6px;font-size:16px;font-weight:700;}
.card p{margin:0;color:var(--muted);font-size:13px;}
.tag{
  display:inline-block;
  background:rgba(47,111,255,0.15);
  color:var(--blue-light);
  font-size:11px;
  font-weight:600;
  padding:3px 9px;
  border-radius:20px;
  margin-top:8px;
  border:1px solid rgba(47,111,255,0.3);
}
.demo-badge{
  background:rgba(255,176,32,0.15);
  color:#ffb020;
  border:1px solid rgba(255,176,32,0.35);
  font-size:11.5px;
  font-weight:700;
  padding:5px 12px;
  border-radius:20px;
  margin-bottom:18px;
  display:inline-block;
  letter-spacing:0.2px;
}
form.auth{
  max-width:400px;
  margin:60px auto;
  background:var(--card);
  padding:36px 32px;
  border-radius:16px;
  border:1px solid var(--border);
  box-shadow:0 20px 50px rgba(0,0,0,0.35);
  text-align:center;
}
form.auth h2{margin-top:6px;font-weight:800;color:var(--text);text-align:center;font-size:24px;}
form.auth label{display:block;margin:16px 0 6px;font-size:13.5px;color:var(--muted);text-align:left;font-weight:600;}
form.auth input{
  width:100%;
  padding:11px 12px;
  border-radius:8px;
  border:1px solid var(--border);
  background:var(--bg-soft);
  color:var(--text);
  font-size:14px;
  transition:border-color .15s;
}
form.auth input:focus{outline:none;border-color:var(--blue);}
form.auth button{width:100%;margin-top:22px;padding:13px;font-size:15px;}
.hint{font-size:12.5px;color:var(--muted);margin-top:12px;text-align:center;line-height:1.5;}
.error{color:#ff6b6b;font-size:13px;margin-top:10px;text-align:center;}
footer{
  text-align:center;
  padding:26px;
  color:var(--muted);
  font-size:13px;
  border-top:1px solid var(--border);
  margin-top:50px;
  background:var(--bg-soft);
}
.forum-post{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:12px;
  padding:18px 20px;
  margin-bottom:16px;
  transition:border-color .15s;
}
.forum-post:hover{border-color:var(--blue);}
.forum-post h4{margin:0 0 8px;color:var(--blue-light);font-size:16px;}
.forum-post .meta{color:var(--muted);font-size:12px;margin-bottom:10px;}
.profile-header{
  display:flex;
  align-items:center;
  gap:24px;
  background:var(--card);
  padding:28px;
  border-radius:16px;
  border:1px solid var(--border);
  box-shadow:0 20px 50px rgba(0,0,0,0.3);
}
.profile-header canvas,.profile-header img.avatar{
  width:90px;height:90px;border-radius:12px;background:var(--bg-soft);
  box-shadow:0 6px 18px rgba(47,111,255,0.25);
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:4px;
  font-size:11.5px;
  padding:4px 10px;
  border-radius:20px;
  font-weight:700;
  margin-left:6px;
  vertical-align:middle;
}
.badge.verified{background:rgba(47,111,255,0.18);color:var(--blue-light);border:1px solid rgba(47,111,255,0.4);}
.badge.admin{background:rgba(255,75,75,0.15);color:#ff6b6b;border:1px solid rgba(255,75,75,0.4);}