:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  font-family: "Poppins", "Helvetica Neue", Arial, sans-serif;
}

body.black-page {
  background: #020617;
  color: #020617;
}

.page-shell {
  min-height: 100vh;
  padding: 24px;
}

.toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: #020617;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  opacity: 0.05;
}

.btn:hover {
  color: #f8fafc;
  border-color: #f8fafc;
  box-shadow: 0 6px 16px rgba(248, 250, 252, 0.12);
  opacity: 1;
}

@media (max-width: 640px) {
  .page-shell {
    padding: 20px;
  }
}