:root{
  --bg1:#0b1b33;
  --bg2:#102842;
  --card:#0f2540;
  --muted:#9fb7d6;
  --accent:#66a6ff;
  --accent-2:#2f63b3;
  --glass: rgba(255,255,255,0.04);
  --card-contrast: rgba(255,255,255,0.03);
  --text:#eaf6ff;
  --soft:#cfe7ff;
  --radius:14px;
  --maxwidth:1200px;
  font-family: Inter, system-ui, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size:16px;
}
body{
  margin:0;
  min-height:100vh;
  color:var(--text);
  background:linear-gradient(180deg,var(--bg1),var(--bg2));
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
.container{
  max-width:var(--maxwidth);
  margin:0 auto;
  padding:28px;
}
.layout{
  display:flex;
  gap:24px;
  align-items:flex-start;
}
.sidebar{
  width:240px;
  position:sticky;
  top:24px;
  height:calc(100vh - 48px);
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:var(--radius);
  padding:18px;
  box-shadow:0 8px 30px rgba(2,8,20,0.55);
  overflow:auto;
}
.brand{
  font-weight:800;
  color:var(--soft);
  text-align:center;
  letter-spacing:0.6px;
  margin-bottom:12px;
  font-size:1.05rem;
}
.nav a{
  display:block;
  color:var(--muted);
  text-decoration:none;
  padding:10px 12px;
  border-radius:10px;
  margin-bottom:8px;
  transition:all .22s ease;
  font-weight:600;
}
.nav a:hover{ background:var(--glass); transform:translateX(6px); color:var(--text); box-shadow:0 8px 20px rgba(0,0,0,0.35); }
.toggles{display:flex;gap:8px;justify-content:center;margin-top:12px}
.toggle-btn{background:transparent;border:1px solid rgba(255,255,255,0.05);padding:8px 10px;border-radius:10px;color:var(--muted);cursor:pointer;font-weight:700}
.main{
  flex:1;
  min-height:calc(100vh - 56px);
}
.page{
  display:none;
  opacity:0;
  transform:translateY(10px);
  transition:opacity .45s ease, transform .45s cubic-bezier(.2,.9,.1,1);
  margin-bottom:28px;
}
.page.active{
  display:block;
  opacity:1;
  transform:translateY(0);
}
.header-hero{
  background:linear-gradient(90deg,var(--accent-2),var(--accent));
  padding:42px;
  border-radius:var(--radius);
  box-shadow:0 18px 50px rgba(8,18,40,0.45);
  margin-bottom:18px;
}
.h-title{font-size:clamp(1.6rem,3.4vw,2.6rem);margin:0 0 8px 0}
.h-sub{color:rgba(255,255,255,0.95);margin:0;font-weight:600}
.content-box{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:12px;
  padding:22px;
  box-shadow:0 8px 30px rgba(1,6,20,0.45);
  margin-bottom:18px;
}
.grid{
  display:grid;
  gap:16px;
  grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));
  margin-top:12px;
}
.card{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:12px;
  padding:16px;
  min-height:120px;
  box-shadow:0 12px 28px rgba(0,0,0,0.45);
}
.big{
  font-size:1.05rem;
  line-height:1.7;
  color:var(--soft);
}
.gallery-grid{
  display:grid;
  gap:12px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}
.gallery-grid img{
  width:100%;
  height:220px;
  object-fit:cover;
  border-radius:10px;
  transition:transform .6s cubic-bezier(.2,.9,.1,1), box-shadow .3s;
  box-shadow:0 10px 28px rgba(2,8,20,0.55);
}
.gallery-grid img:hover{ transform:scale(1.04) translateY(-6px); box-shadow:0 20px 48px rgba(2,8,20,0.6); }
.controls{display:flex;gap:10px;align-items:center;margin-top:12px}
.button{background:var(--accent);border:0;padding:10px 14px;border-radius:10px;color:#04203b;font-weight:800;cursor:pointer;box-shadow:0 8px 24px rgba(32,80,150,0.18)}
.small{background:transparent;border:1px solid rgba(255,255,255,0.06);padding:8px 10px;border-radius:8px;color:var(--muted);cursor:pointer}
.popover{
  position:fixed;
  background:rgba(2,6,20,0.98);
  color:var(--soft);
  padding:12px 14px;
  border-radius:10px;
  box-shadow:0 18px 50px rgba(0,0,0,0.7);
  transform:translateY(6px);
  opacity:0;
  pointer-events:none;
  transition:opacity .18s ease, transform .18s ease;
  max-width:300px;
  z-index:1200;
}
.popover.show{ opacity:1; transform:translateY(0); pointer-events:auto; }
.footer{
  margin-top:18px;
  text-align:center;
  color:var(--muted);
  font-size:0.95rem;
}
/* page fill helpers */
.fill-vertical{min-height:62vh;display:flex;flex-direction:column;gap:14px;justify-content:flex-start}
/* scroll animations */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
/* dark mode */
.light{
  --bg1:#e9f2ff;
  --bg2:#f0f6ff;
  --card:#ffffff;
  --muted:#234065;
  --accent:#2f63b3;
  --accent-2:#1a3b73;
  --text:#021224;
  --soft:#021224;
  background:linear-gradient(180deg,var(--bg1),var(--bg2));
}
@media(max-width:920px){
  .layout{flex-direction:column;padding:16px}
  .sidebar{position:relative; width:100%; height:auto; display:flex; flex-direction:row; gap:8px; overflow-x:auto; padding:12px}
  .sidebar h2{display:none}
  .main{width:100%}
  .container{padding:12px}
}