:root {
  color-scheme: dark;
  --bg: #08111f;
  --panel: rgba(12, 22, 40, 0.88);
  --panel-soft: rgba(18, 30, 52, 0.72);
  --border: rgba(148, 163, 184, 0.18);
  --text: #e5eefc;
  --muted: #9fb0ca;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #10213d 0%, var(--bg) 58%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel-soft);
  padding: 28px 18px;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 28px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  font-size: 24px;
}

.brand h1,
.card-header h3,
.topbar h2 {
  margin: 0;
}

.brand p,
.topbar p,
.card-body p {
  margin: 6px 0 0;
  color: var(--muted);
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.menu-item {
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.72);
  color: var(--text);
  border-radius: 12px;
  padding: 12px 14px;
  text-align: left;
  font: inherit;
}

.menu-item.active {
  border-color: rgba(56, 189, 248, 0.5);
  background: var(--accent-soft);
}

.content {
  padding: 32px;
}

.topbar {
  margin-bottom: 24px;
}

.topbar-kicker {
  margin-bottom: 10px;
}

.version-pill,
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.7);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card {
  max-width: 760px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.22);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px 0;
}

.card-body {
  padding: 18px 24px 24px;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .content {
    padding: 20px;
  }
}