:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #243042;
  --muted: #5b6778;
  --accent: #1f5fa7;
  --border: #dce4ef;
  --shadow: 0 12px 30px rgba(31, 74, 129, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "Inter", -apple-system, BlinkMacSystemFont, "Roboto", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f9fbff 0%, var(--bg) 100%);
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 24px 16px 20px;
}

.site-header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 0 24px;
}

.logo {
  width: min(360px, 72vw);
  height: auto;
  display: block;
}

.main-content {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 12px 0;
}

.stub-card {
  width: min(720px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  text-align: center;
  padding: 40px 24px;
}

.stub-card h1 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 2.8vw, 2.1rem);
  color: var(--accent);
  font-weight: 700;
}

.stub-card p {
  margin: 0;
  font-size: clamp(1rem, 2.1vw, 1.15rem);
  color: var(--muted);
  line-height: 1.55;
}

.site-footer {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  color: var(--muted);
}

.site-footer h2 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
}

.admin-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.admin-list span {
  min-width: 128px;
  display: inline-block;
  color: var(--text);
  font-weight: 600;
}

@media (max-width: 640px) {
  .page {
    padding: 16px 12px 16px;
  }

  .site-header {
    padding-bottom: 18px;
  }

  .stub-card {
    padding: 30px 18px;
    border-radius: 14px;
  }

  .admin-list span {
    min-width: 106px;
  }
}