:root{
  --bg:#0f172a;
  --card:#111827;
  --accent:#22c55e;
  --text:#f1f5f9;
  --muted:#94a3b8;
}

*{box-sizing:border-box;margin:0;padding:0}

body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:var(--accent);text-decoration:none}
a:hover{opacity:.85}

.container{
  max-width:900px;
  margin:auto;
  padding:24px;
}

nav{
  background:#020617;
  padding:14px 24px;
  border-bottom:1px solid #1f2933;
  position:sticky;
  top:0;
}

nav a{
  margin-right:16px;
  font-weight:600;
}

.card{
  background:var(--card);
  border-radius:14px;
  padding:20px;
  margin-bottom:18px;
  box-shadow:0 4px 20px rgba(0,0,0,.25);
}

h1{margin-bottom:16px;font-size:28px}
h2{font-size:20px;margin-bottom:8px}
h3{font-size:16px;margin-bottom:6px}

audio{
  width:100%;
  margin:12px 0;
}

.button{
  display:inline-block;
  background:var(--accent);
  color:#052e16;
  padding:10px 16px;
  border-radius:8px;
  font-weight:700;
}

hr{
  border:none;
  border-top:1px solid #1f2933;
  margin:20px 0;
}

@media(max-width:600px){
  h1{font-size:22px}
}