:root{
  --max-width:1100px;
  --accent:#0077ff;
  --bg:#f4f4f4;
  --card:#ffffff;
  --muted:#666;
}

*{box-sizing:border-box}

body{
  margin:0;
  font-family:Inter, "Segoe UI", Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:#111;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.6;
}

/* Header */
.site-header{
  background:url('https://images.unsplash.com/photo-1500530855697-b586d89ba3ee?auto=format&fit=crop&w=2000&q=80') center/cover no-repeat;
  color:#fff;
  height:42vh;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  text-align:center;
  padding:30px 20px;
  position:relative; /* ensure nav overlays correctly */
}

.header-inner{max-width:1100px}
.site-header h1{font-size:2.2rem;margin:0}
.site-header .lead{margin-top:8px;opacity:0.95;font-weight:500}

/* Navigation */
.top-nav{
  display:flex;
  flex-wrap:wrap; /* wrap links on small screens */
  gap:6px;
  justify-content:center;
  padding:8px 6px;
  background:rgba(0,0,0,0.4); /* semi-transparent dark for readability */
  position:sticky;
  top:0;
  z-index:50;
  border-bottom:1px solid rgba(0,0,0,0.1);
  width:100%;
  box-sizing:border-box;
}

.top-nav a{
  color:#fff; /* white text on dark background */
  text-decoration:none;
  font-weight:600;
  font-size:0.85rem;
  padding:6px 10px;
  border-radius:6px;
  white-space:nowrap;
  transition:background 0.2s;
}

.top-nav a:hover{background:rgba(255,255,255,0.2)}

/* Main container */
.container{
  max-width:var(--max-width);
  margin: -60px auto 40px;
  background:var(--card);
  padding:34px;
  border-radius:12px;
  box-shadow:0 10px 30px rgba(18,18,18,0.06);
}

/* Topic sections */
.topic{margin-bottom:28px}
.topic h2{font-size:1.4rem;color:#111;margin:0 0 10px}
.section-img{
  width:100%;
  border-radius:10px;
  margin:10px 0 14px;
  display:block;
  object-fit:cover;
  max-height:480px;
}

ul{list-style:none;padding-left:0;margin:0}
ul li{padding:8px 0;font-size:1.05rem;display:flex;align-items:flex-start;gap:10px}

.guides-list{padding-left:0;margin:0}
.blog-link{color:var(--accent);text-decoration:none;font-weight:700}
.blog-link:hover{text-decoration:underline}

.mini-article{
  background:#fbfbfe;
  border-left:4px solid var(--accent);
  padding:12px 14px;
  margin-top:12px;
  border-radius:6px;
}

/* Footer */
.site-footer{
  text-align:center;
  padding:24px 12px;
  color:var(--muted);
  font-size:0.95rem;
  margin-top:18px;
}
.footer-nav{margin-top:8px}
.footer-nav a{margin-left:12px;color:var(--accent);text-decoration:none;font-weight:600}

/* Responsive styles */
@media(max-width:600px){
  .top-nav{
    flex-wrap:wrap;
    gap:6px;
    padding:8px 6px;
  }
  .top-nav a{
    font-size:0.75rem;
    padding:4px 6px;
    flex:1 0 auto; 
    min-width:0;
    text-align:center;
  }
  .container{padding:24px}
}

@media(min-width:900px){
  .site-header h1{font-size:2.6rem}
  .container{padding:48px}
  .top-nav{gap:10px;padding:14px 20px}
}