:root {
  color-scheme: dark;
  --bg: #0b1220;
  --panel: rgba(20, 30, 48, .88);
  --border: rgba(148, 163, 184, .18);
  --text: #e5edf8;
  --muted: #9aaac0;
  --accent: #6ea8fe;
  --accent-hover: #8bb9ff;
  --danger: #ff8f8f;
  --shadow: 0 24px 70px rgba(0, 0, 0, .34);
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at 20% 0%, #1b2d4b 0, transparent 45%), var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.security-card {
  width: min(100%, 460px);
  padding: 34px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.security-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(110, 168, 254, .14);
  color: var(--accent);
  font-size: 24px;
  font-weight: 700;
}
h1 { margin: 22px 0 8px; font-size: clamp(25px, 6vw, 34px); letter-spacing: -.02em; }
p { margin: 0; color: var(--muted); }
.hint { margin-top: 14px; font-size: 14px; }
.actions { display: flex; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--accent);
  color: #08111f;
  font-weight: 700;
  text-decoration: none;
  transition: background .16s ease, transform .16s ease;
}
.button:hover { background: var(--accent-hover); transform: translateY(-1px); }
.button.secondary { border-color: var(--border); background: transparent; color: var(--text); }
.button.secondary:hover { background: rgba(148, 163, 184, .1); }
@media (max-width: 480px) {
  body { padding: 16px; }
  .security-card { padding: 26px 22px; border-radius: 20px; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
}
@media (prefers-color-scheme: light) {
  :root { color-scheme: light; --bg: #eef3f9; --panel: rgba(255,255,255,.94); --border: rgba(30, 41, 59, .12); --text: #172033; --muted: #5f6d82; --shadow: 0 24px 70px rgba(15, 23, 42, .12); }
  body { background: radial-gradient(circle at 20% 0%, #d9e7fb 0, transparent 45%), var(--bg); }
}