:root {
  --primary: #6e93ec;
  --secondary: #65b9ff;
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --text: #202020;
  --muted: #5a6472;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #202020;
    --card-bg: #3d3d3d;
    --text: #f4f6fb;
    --muted: #b7bfca;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background: linear-gradient(135deg, var(--bg), var(--bg));
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 48px 40px;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
}

.logo {
  width: 72px;
  height: 72px;
  object-fit: contain;
  margin-bottom: 16px;
}

.spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 24px;
  border-radius: 50%;
  border: 4px solid rgba(110, 147, 236, 0.2);
  border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 16px;
  color: var(--primary);
}

p {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  margin: 0 0 8px;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 20px;
}