:root {
  --bg: #0b0c10;
  --panel: #111216;
  --panel-2: #171a20;
  --text: #e8eaf0;
  --muted: #9aa0aa;
  --accent: #5aa9e6;
  --border: #2a2e36;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: linear-gradient(180deg, #0b0c10, #0e121a 60%);
  color: var(--text);
  font: 14px/1.5 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    'Noto Sans', sans-serif;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.header h1 {
  font-size: 16px;
  margin: 0;
  letter-spacing: 0.2px;
}
.header a {
  color: var(--muted);
  text-decoration: none;
}
.header a:hover {
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 48px);
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 12px;
}
.nav-group {
  margin-bottom: 10px;
}
.nav-title {
  font-size: 12px;
  text-transform: uppercase;
  color: #cfd6e6;
  margin: 8px 6px;
  letter-spacing: 0.15em;
}
.nav a {
  display: block;
  padding: 8px 10px;
  margin: 4px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  background: var(--panel-2);
}
.nav a:hover {
  border-color: #3a3f4a;
}
.nav a.active {
  outline: 2px solid #3a82f6;
}

.content {
  padding: 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.item {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: 12px;
}
.item h3 {
  margin: 6px 0 8px;
  font-size: 15px;
}
.item p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}
.item a {
  color: var(--accent);
  text-decoration: none;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .sidebar {
    order: 2;
  }
}

@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .content {
    padding: 12px;
  }
}

/* Independent scrolling for sidebar/content */
:root {
  --header-h: 56px;
}

html,
body {
  height: 100%;
}
body {
  overflow: hidden;
} /* prevent page scroll; use regional scrolls */

.header {
  height: var(--header-h);
}

.layout {
  height: calc(100vh - var(--header-h));
  overflow: hidden; /* contain the two scroll areas */
}

.layout > .sidebar,
.layout > .content {
  min-height: 0;
} /* allow overflow containers to actually shrink */

.sidebar {
  overflow-y: auto;
}
.content {
  overflow-y: auto;
}