:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #6b7785;
  --accent: #2f6f4f;
  --accent-hover: #265a40;
  --border: #e3e8ee;
}

* { box-sizing: border-box; }

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

body {
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
}

.site-header img {
  height: 72px;
  width: auto;
  display: block;
}

.site-header h1 {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 40px;
  max-width: 460px;
  width: 100%;
  text-align: center;
  box-shadow: 0 6px 24px rgba(31, 41, 51, 0.06);
}

.card p {
  color: var(--muted);
  margin: 0 0 24px;
  line-height: 1.5;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 10px;
  transition: background 0.15s ease;
}

.btn:hover { background: var(--accent-hover); }

.foot {
  margin-top: 22px;
  font-size: 0.85rem;
  color: var(--muted);
}

.foot a { color: var(--accent); text-decoration: none; }
.foot a:hover { text-decoration: underline; }

@media (max-width: 520px) {
  .site-header { flex-direction: column; text-align: center; gap: 12px; }
  .card { padding: 28px 22px; }
}