:root {
  color-scheme: dark light;
  --bg: #0d1117;
  --panel: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --border: #30363d;
  --accent: #58a6ff;
  --danger: #ff7b72;
  --warn: #d29922;
  --ok: #3fb950;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --panel: #ffffff;
    --text: #24292f;
    --muted: #57606a;
    --border: #d0d7de;
    --accent: #0969da;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); text-decoration: none; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  position: sticky;
  top: 0;
}
.brand { font-size: 1.35rem; font-weight: 800; color: var(--text); }
.tagline { color: var(--muted); margin-left: 12px; }
nav { display: flex; gap: 16px; align-items: center; }
nav form { margin: 0; }
.container { max-width: 1080px; margin: 0 auto; padding: 32px 20px; }
.hero, .panel, .card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 10px 32px rgba(0,0,0,.12);
}
.hero { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.grid { display: grid; gap: 16px; margin-bottom: 20px; }
.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.metric { display: block; font-size: 2.2rem; font-weight: 800; }
.muted { color: var(--muted); }
.form-stack { display: grid; gap: 14px; }
input, button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 12px 14px;
  font: inherit;
}
input { background: var(--bg); color: var(--text); margin-top: 6px; }
button { background: var(--accent); color: white; border: 0; cursor: pointer; font-weight: 700; }
button.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); padding: 8px 12px; }
.login-panel { max-width: 460px; margin: 60px auto; }
.alert.error { background: #4a1f1b; border: 1px solid var(--danger); padding: 12px; border-radius: 12px; margin-bottom: 16px; }
.row { border-top: 1px solid var(--border); padding: 16px 0; }
.row:first-child { border-top: 0; }
.row span { display: block; color: var(--muted); font-size: .9rem; margin-top: 4px; }
.severity-critical, .severity-high { border-left: 4px solid var(--danger); padding-left: 12px; }
.severity-medium { border-left: 4px solid var(--warn); padding-left: 12px; }
.severity-low { border-left: 4px solid var(--accent); padding-left: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; border-bottom: 1px solid var(--border); padding: 12px; }
@media (max-width: 760px) {
  .topbar, .hero { flex-direction: column; align-items: flex-start; gap: 16px; }
  nav { flex-wrap: wrap; }
  .three { grid-template-columns: 1fr; }
}