:root{
  --bg:#ffffff;
  --text:#111111;
  --muted:#666666;
  --border:#e6e6e6;
  --maxw:1080px;
  --sidebarw:260px;
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.5;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; }

header, nav, main, footer{ display:block; }

/* Layout */
.topbar{
  display:none;
  align-items:center;
  justify-content:space-between;
  padding:12px 16px;
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  background:var(--bg);
  z-index:10;
}

.layout{
  display:flex;
  min-height:100vh;
}

.sidebar{
  width:var(--sidebarw);
  border-right:1px solid var(--border);
  padding:20px 16px;
  position:sticky;
  top:0;
  height:100vh;
  overflow:auto;
  background:var(--bg);
}

.content{
  flex:1;
  padding:28px 18px 48px;
}

.content > *{
  max-width:var(--maxw);
}

/* Nav */
.brand{
  font-weight:700;
  display:block;
  margin-bottom:16px;
}

.nav, .subnav{
  list-style:none;
  padding:0;
  margin:0;
}

.nav > li{ margin:10px 0; }
.subnav{
  margin-top:8px;
  padding-left:12px;
  border-left:1px solid var(--border);
}
.subnav li{ margin:8px 0; }

.sidebar-footer{
  margin-top:24px;
  padding-top:16px;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:14px;
}

/* Page content */
.hero{
  border:1px solid var(--border);
  padding:18px;
  color:var(--muted);
}

.statement h2{
  font-size:16px;
  letter-spacing:.08em;
  margin-top:18px;
}

footer{
  color:var(--muted);
  font-size:14px;
  padding:18px;
  border-top:1px solid var(--border);
}

/* Mobile */
@media (max-width:860px){
  .topbar{ display:flex; }
  .sidebar{
    position:fixed;
    left:0;
    top:0;
    transform:translateX(-110%);
    transition:transform .2s ease;
    z-index:20;
  }
  .sidebar.open{ transform:translateX(0); }
  .content{ padding-top:18px; }
}