:root{--p:#0066ff;--bg:#ffffff;--text:#111;--card:#f8f9fa}
[data-theme="dark"]{--p:#1e90ff;--bg:#0d1117;--text:#e6edf3;--card:#161b22}

*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',Arial,sans-serif;line-height:1.6;background:var(--bg);color:var(--text);transition:0.4s}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
header{background:var(--p);color:white;padding:1rem 0;position:relative}
.logo img{height:45px;vertical-align:middle}
header h1{display:inline-block;margin-left:12px;font-size:1.9rem;vertical-align:middle}
nav{float:right;margin-top:12px}
nav a{color:white;margin-left:22px;text-decoration:none;font-weight:600}
nav a:hover{text-decoration:underline}
main{padding:40px 0;min-height:70vh}
h1,h2,h3{color:var(--text)}
table{width:100%;border-collapse:collapse;margin:30px 0;background:var(--card);border-radius:8px;overflow:hidden}
th,td{padding:16px;text-align:left;border-bottom:1px solid #ddd}
th{background:var(--p);color:white}
.btn{display:inline-block;background:var(--p);color:white;padding:13px 28px;border-radius:8px;text-decoration:none;font-weight:bold;margin:10px 0}
.btn:hover{background:#0052cc}
.ad{text-align:center;margin:50px 0}
footer{background:#111;color:#888;text-align:center;padding:30px 0}
.clear{clear:both}

/* Dark mode toggle button */
.theme-toggle{
  position:fixed;top:20px;right:20px;background:#333;color:white;border:none;
  padding:10px 14px;border-radius:50px;cursor:pointer;font-size:18px;z-index:999;
  box-shadow:0 2px 10px rgba(0,0,0,0.3)
}
.theme-toggle:hover{background:#555}

@media(max-width:768px){
  nav{float:none;text-align:center;margin-top:15px}
  nav a{display:inline-block;margin:8px 12px}
  .theme-toggle{top:15px;right:15px}
}