:root {
  --primary: #165dff;
  --primary-hover: #0e42d2;
  --primary-soft: #e8f3ff;
  --text-1: #1d2129;
  --text-2: #4e5969;
  --text-3: #86909c;
  --line: #e5e6eb;
  --fill: #f7f8fa;
  --white: #fff;
  --warning: #ff7d00;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--text-1);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.75;
}

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

a:hover {
  color: var(--primary-hover);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.topbar-inner {
  width: min(calc(100% - 40px), 1120px);
  min-height: 60px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-1);
  font-size: 16px;
  font-weight: 700;
}

.brand img {
  width: 28px;
  height: 28px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
}

.nav a {
  color: var(--text-2);
}

.nav a:hover {
  color: var(--primary);
}

.layout {
  width: min(calc(100% - 40px), 1120px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 64px;
  padding: 42px 0 72px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-3);
  font-size: 13px;
}

.breadcrumb a {
  color: var(--text-3);
}

.article-header {
  padding: 22px 0 34px;
  border-bottom: 1px solid var(--line);
}

.article-header h1 {
  max-width: 820px;
  margin: 0;
  font-size: 34px;
  line-height: 1.3;
  letter-spacing: 0;
}

.article-header p {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--text-2);
  font-size: 17px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 18px;
  color: var(--text-3);
  font-size: 13px;
}

.article section {
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 84px;
}

.article h2 {
  margin: 0 0 14px;
  font-size: 23px;
  line-height: 1.45;
  letter-spacing: 0;
}

.article h3 {
  margin: 24px 0 8px;
  font-size: 17px;
  letter-spacing: 0;
}

.article p {
  margin: 10px 0;
}

.article ul,
.article ol {
  margin: 12px 0;
  padding-left: 24px;
}

.article li {
  margin: 7px 0;
}

code {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--fill);
  color: #0f3e9e;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
  overflow-wrap: anywhere;
}

pre {
  margin: 16px 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid #2f3338;
  border-radius: 6px;
  background: #1d2129;
  color: #f2f3f5;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.65;
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

.note,
.warning {
  margin: 18px 0;
  padding: 14px 16px;
  border-left: 3px solid var(--primary);
  background: var(--primary-soft);
  color: #0f3e9e;
}

.warning {
  border-left-color: var(--warning);
  background: #fff7e8;
  color: #8d4b00;
}

.table-wrap {
  margin: 18px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--fill);
  color: var(--text-2);
  font-size: 13px;
}

tr:last-child td {
  border-bottom: 0;
}

.sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
  border-left: 1px solid var(--line);
  padding-left: 22px;
}

.sidebar strong {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
}

.sidebar a {
  display: block;
  padding: 6px 0;
  color: var(--text-2);
  font-size: 13px;
}

.sidebar a:hover {
  color: var(--primary);
}

.cta {
  margin-top: 32px;
  padding: 24px;
  background: var(--fill);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cta h2 {
  margin: 0 0 4px;
  font-size: 19px;
}

.cta p {
  margin: 0;
  color: var(--text-2);
}

.button {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 18px;
  border-radius: 4px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}

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

.footer {
  border-top: 1px solid var(--line);
  color: var(--text-3);
}

.footer-inner {
  width: min(calc(100% - 40px), 1120px);
  margin: 0 auto;
  padding: 24px 0 32px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-size: 13px;
}

@media (max-width: 820px) {
  .topbar-inner,
  .layout,
  .footer-inner {
    width: min(calc(100% - 28px), 1120px);
  }

  .nav a:not(:last-child) {
    display: none;
  }

  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-top: 26px;
  }

  .sidebar {
    display: none;
  }

  .article-header h1 {
    font-size: 28px;
  }

  .article-header p {
    font-size: 16px;
  }

  .cta {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-inner {
    flex-direction: column;
  }
}