:root {
  --bg-color: #ffffff;
  --text-color: #1d1d1f;
  --text-light: #86868b;
  --primary-color: #0066cc;
  --primary-hover: #0077ed;
  --border-color: #d2d2d7;
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --card-bg: transparent;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --text-light: #86868b;
    --primary-color: #2997ff;
    --primary-hover: #147ce5;
    --border-color: #424245;
  }
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
}

.header {
  padding: 80px 0 40px;
  text-align: left;
  border-bottom: none;
  background-color: transparent;
}

.header h1 {
  font-size: 48px;
  line-height: 1.08349;
  font-weight: 600;
  letter-spacing: -0.003em;
  margin-bottom: 12px;
  color: var(--text-color);
}

.header p {
  font-size: 21px;
  line-height: 1.38105;
  font-weight: 400;
  letter-spacing: 0.011em;
  color: var(--text-light);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 20px;
}

.header-container>div:first-child {
  flex: 1;
  min-width: 280px;
}

.lang-switch {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 6px;
}

.lang-switch a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.1s;
}

.lang-switch a:hover {
  text-decoration: underline;
  color: var(--primary-hover);
}

.lang-switch span {
  font-weight: 600;
  color: var(--text-color);
}

.main-content {
  padding: 20px 20px 80px;
}

.card {
  background-color: transparent;
  border: none;
  border-top: 1px solid var(--border-color);
  border-radius: 0;
  padding: 40px 0;
  margin-bottom: 0px;
  box-shadow: none;
}

.card:first-child {
  border-top: none;
  padding-top: 0;
}

.card h2 {
  font-size: 24px;
  line-height: 1.16667;
  font-weight: 600;
  letter-spacing: 0.009em;
  margin-bottom: 15px;
  color: var(--text-color);
  border-bottom: none;
  padding-bottom: 0;
}

.card h3 {
  font-size: 19px;
  line-height: 1.21053;
  font-weight: 600;
  letter-spacing: 0.012em;
  margin: 25px 0 10px;
}

.card p {
  font-size: 17px;
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  margin-bottom: 15px;
}

.card ul {
  font-size: 17px;
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  margin-bottom: 15px;
  padding-left: 0;
  list-style-type: none;
}

.card li {
  margin-bottom: 8px;
  position: relative;
  padding-left: 12px;
}

.card li::before {
  content: "•";
  color: var(--text-light);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  position: absolute;
  left: -8px;
}

.card code {
  background-color: rgba(134, 134, 139, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85em;
  border: none;
  color: var(--text-color);
}

.links {
  display: flex;
  gap: 16px;
  justify-content: flex-start;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.button {
  display: inline-block;
  padding: 12px 22px;
  background-color: var(--primary-color);
  color: white !important;
  text-decoration: none;
  border-radius: 980px;
  font-size: 14px;
  line-height: 1.14286;
  font-weight: 400;
  letter-spacing: -.01em;
  transition: background-color 0.2s, transform 0.1s;
}

.button:hover {
  background-color: var(--primary-hover);
}

.button:active {
  transform: scale(0.98);
}

.button-outline {
  background-color: transparent;
  color: var(--text-color) !important;
  border: 1px solid var(--text-color);
}

.button-outline:hover {
  background-color: var(--text-color);
  color: var(--bg-color) !important;
}

@media (prefers-color-scheme: dark) {
  .button {
    color: #1d1d1f !important;
    background-color: var(--primary-color);
    font-weight: 600;
  }

  .button-outline {
    border: 1px solid var(--text-color);
    color: var(--text-color) !important;
  }

  .button-outline:hover {
    background-color: var(--text-color);
    color: var(--bg-color) !important;
  }
}

.footer {
  text-align: left;
  padding: 20px 0;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  margin-top: 20px;
  font-size: 12px;
  line-height: 1.33337;
  font-weight: 400;
  letter-spacing: -0.01em;
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}