* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: #2b2b2b;
  background: #fff;
}

main,
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 20px 96px;
}

header {
  margin-bottom: 28px;
}

h1 {
  font-size: 2.4rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 28px 0 16px;
  color: #222;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h3 {
  font-size: 1.35rem;
  margin: 22px 0 12px;
}

h4 {
  font-size: 1rem;
  margin: 18px 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #333;
}

p {
  margin-bottom: 14px;
  color: #444;
}

a {
  color: #1b55d9;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul,
ol {
  margin: 10px 0 0 22px;
}

li {
  margin: 6px 0;
  color: #555;
  line-height: 1.6;
}

hr {
  border: 0;
  border-top: 1px solid #e4e4e4;
  margin: 26px 0;
}

article {
  margin: 22px 0 10px;
}

.subtitle {
  font-size: 1.2em;
  color: #666;
  font-weight: 400;
}

.intro {
  font-size: 1.1em;
  line-height: 1.75;
  color: #444;
  margin-bottom: 50px;
}

section {
  margin-bottom: 45px;
}

.background-grid {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 15px;
  margin-bottom: 10px;
}

.background-label {
  font-weight: 500;
  color: #666;
}

.background-value {
  color: #444;
}

footer {
  margin-top: 70px;
  padding-top: 35px;
  border-top: 1px solid #e0e0e0;
  color: #666;
  font-size: 0.9em;
}

.container ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.container li {
  margin-bottom: 10px;
}

.container li:before {
  content: "· ";
  color: #999;
  font-weight: 600;
  margin-right: 8px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.container > * {
  animation: fadeIn 0.6s ease-out;
}

.container header {
  animation-delay: 0.1s;
  animation-fill-mode: both;
}

.container .intro {
  animation-delay: 0.2s;
  animation-fill-mode: both;
}

.container section:nth-of-type(1) {
  animation-delay: 0.3s;
  animation-fill-mode: both;
}

.container section:nth-of-type(2) {
  animation-delay: 0.4s;
  animation-fill-mode: both;
}

.container section:nth-of-type(3) {
  animation-delay: 0.5s;
  animation-fill-mode: both;
}

@media (max-width: 640px) {
  main,
  .container {
    padding: 52px 18px 72px;
  }

  h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1.1em;
  }

  .background-grid {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .background-label {
    font-weight: 600;
  }
}