:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: #f4f6f8;
  color: #17202a;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  background: #101820;
  color: #edf2f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: inherit;
  color: inherit;
}

header {
  align-items: center;
  background: #ffffff;
  border-bottom: 1px solid #d8dee6;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding: 16px 32px;
}

:root[data-theme="dark"] header,
:root[data-theme="dark"] .card,
:root[data-theme="dark"] .panel {
  background: #18232e;
  border-color: #334252;
}

nav {
  display: flex;
  gap: 16px;
}

a {
  color: #1665d8;
}

:root[data-theme="dark"] a {
  color: #7db7ff;
}

button {
  background: #1665d8;
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  cursor: pointer;
  padding: 10px 14px;
}

main {
  margin: 0 auto;
  max-width: 1120px;
  padding: 48px 32px;
}

.cards {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 32px;
}

.card,
.panel {
  background: #ffffff;
  border: 1px solid #d8dee6;
  border-radius: 14px;
  padding: 24px;
}

.card h2 {
  font-size: 20px;
  line-height: 1.25;
  margin: 0 0 12px;
}

.card p {
  line-height: 1.6;
  margin: 0;
}

.skeleton {
  display: grid;
  gap: 14px;
}

.skeleton span {
  animation: pulse 0.8s ease-in-out infinite alternate;
  background: #c9d2dc;
  border-radius: 8px;
  display: block;
  height: 22px;
}

.skeleton span:first-child {
  width: 55%;
}

.hidden {
  display: none;
}

.menu {
  margin-top: 16px;
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.menu.hidden {
  display: block;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}

@keyframes pulse {
  from {
    opacity: 0.45;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 700px) {
  header {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 20px;
  }

  nav {
    flex-wrap: wrap;
  }

  main {
    padding: 32px 20px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}