:root{
  --bg:#0b0f14;
  --panel:#0f1720;
  --panel2:#111a24;
  --border:#243041;
  --text:#e6edf3;
  --muted:#9fb0c2;
  --accent:#5eead4;
  --link:#e6edf3;
  --card:#0f1720;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, var(--panel), rgba(15,23,32,0.4));
  position:sticky;
  top:0;
  z-index:5;
}

.brand{ display:flex; align-items:center; gap:12px; }
.brand__logo{ width:40px; height:40px; object-fit:contain; border-radius:10px; background:#0b0f14; border:1px solid var(--border); padding:6px; }
.brand__title{ font-weight:700; letter-spacing:.2px; }
.brand__subtitle{ color:var(--muted); font-size:13px; margin-top:2px; }

.search{
  width:min(520px, 52vw);
  padding:10px 12px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--panel2);
  color:var(--text);
  outline:none;
}
.search::placeholder{ color:#7f93a8; }

.layout{
  display:grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 64px);
}

.sidebar{
  border-right:1px solid var(--border);
  background:rgba(15,23,32,0.35);
  padding:14px 10px;
}

.nav{ display:flex; flex-direction:column; gap:6px; }
.nav__item{
  padding:10px 12px;
  border-radius:10px;
  color:var(--link);
  text-decoration:none;
  border:1px solid transparent;
}
.nav__item:hover{
  background:rgba(17,26,36,0.8);
  border-color:var(--border);
}
.nav__item[aria-current="page"]{
  background:rgba(94,234,212,0.10);
  border-color:rgba(94,234,212,0.35);
}

.content{
  padding:22px;
  max-width: 1100px;
}

.h1{ margin:0 0 10px; font-size:28px; }
.muted{ margin:0 0 18px; color:var(--muted); }

.grid{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap:14px;
}

.card{
  display:block;
  padding:14px;
  border-radius:14px;
  border:1px solid var(--border);
  background:rgba(15,23,32,0.55);
  text-decoration:none;
  color:var(--text);
  transition:transform .08s ease, border-color .08s ease, background .08s ease;
}
.card:hover{
  transform: translateY(-1px);
  background:rgba(17,26,36,0.8);
  border-color:rgba(94,234,212,0.35);
}
.card__title{ font-weight:700; margin-bottom:6px; }
.card__meta{ color:var(--muted); font-size:13px; line-height:1.4; }

@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
  .sidebar{ border-right:none; border-bottom:1px solid var(--border); }
  .grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .search{ width:100%; }
}

@media (max-width: 560px){
  .grid{ grid-template-columns: 1fr; }
}