:root {
  --bg-color: #0d1117;
  --text-color: #e6edf3;
  --heading-color: #f0f6fc;
  --code-bg: #161b22;
  --code-color: #e6edf3;
  --code-border: #30363d;
  --quote-bg: #0d1117;
  --quote-border: #656d76;
  --quote-text: #8b949e;
  --link-color: #2f81f7;
  --link-hover: #58a6ff;
  --button-bg: #21262d;
  --button-color: #f0f6fc;
  --button-hover: #30363d;
  --border-color: #30363d;
  --table-border: #30363d;
  --table-header-bg: #161b22;
  --table-row-bg: #0d1117;
  --table-row-hover: #161b22;
  --hr-color: #30363d;
  --selection-bg: #264f78;
}

[data-theme="light"] {
  --bg-color: #ffffff;
  --text-color: #1f2328;
  --heading-color: #1f2328;
  --code-bg: #f6f8fa;
  --code-color: #1f2328;
  --code-border: #d1d9e0;
  --quote-bg: #f6f8fa;
  --quote-border: #d1d9e0;
  --quote-text: #656d76;
  --link-color: #0969da;
  --link-hover: #0550ae;
  --button-bg: #f6f8fa;
  --button-color: #1f2328;
  --button-hover: #f3f4f6;
  --border-color: #d1d9e0;
  --table-border: #d1d9e0;
  --table-header-bg: #f6f8fa;
  --table-row-bg: #ffffff;
  --table-row-hover: #f6f8fa;
  --hr-color: #d1d9e0;
  --selection-bg: #0969da20;
}

* {
  box-sizing: border-box;
}

body {
  max-width: 980px;
  margin: 0 auto;
  padding: 45px;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

::selection {
  background: var(--selection-bg);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 24px;
  margin-bottom: 16px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--heading-color);
}

h1 {
  font-size: 2em;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

h2 {
  font-size: 1.5em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-size: 1.25em;
}

h4 {
  font-size: 1em;
}

h5 {
  font-size: 0.875em;
}

h6 {
  font-size: 0.85em;
  color: var(--quote-text);
}

p {
  margin-top: 0;
  margin-bottom: 16px;
}

code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 85%;
  color: var(--code-color);
  border: 1px solid var(--code-border);
}

pre {
  background: var(--code-bg);
  padding: 2px;
  overflow: auto;
  border-radius: 6px;
  color: var(--code-color);
  border: 1px solid var(--code-border);
  margin-top: 0;
  margin-bottom: 16px;
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 85%;
  line-height: 1.45;
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 100%;
  color: inherit;
}

blockquote {
  border-left: 4px solid var(--quote-border);
  padding: 0 1em;
  margin: 0 0 16px 0;
  color: var(--quote-text);
  background-color: var(--quote-bg);
  border-radius: 0 6px 6px 0;
}

blockquote > :first-child {
  margin-top: 0;
}

blockquote > :last-child {
  margin-bottom: 0;
}

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

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

ul,
ol {
  padding-left: 2em;
  margin-top: 0;
  margin-bottom: 16px;
}

li + li {
  margin-top: 0.25em;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  margin-top: 0;
  margin-bottom: 16px;
}

th,
td {
  padding: 6px 13px;
  border: 1px solid var(--table-border);
  text-align: left;
}

th {
  background-color: var(--table-header-bg);
  font-weight: 600;
}

tr {
  background-color: var(--table-row-bg);
}

tr:nth-child(2n) {
  background-color: var(--table-row-hover);
}

hr {
  height: 0.25em;
  padding: 0;
  margin: 24px 0;
  background-color: var(--hr-color);
  border: 0;
  border-radius: 2px;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.task-list-item {
  list-style-type: none;
  margin-left: -1.5em;
}

.task-list-item-checkbox {
  margin-right: 0.5em;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--button-bg);
  color: var(--button-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  width: 40px;
  height: 40px;
  font-size: 16px;
  cursor: pointer;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.12),
    0 1px 2px rgba(0, 0, 0, 0.24);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--button-hover);
  box-shadow:
    0 3px 6px rgba(0, 0, 0, 0.16),
    0 3px 6px rgba(0, 0, 0, 0.23);
}

.theme-toggle:active {
  transform: scale(0.95);
}

@media (max-width: 767px) {
  body {
    padding: 15px;
  }

  .theme-toggle {
    top: 15px;
    right: 15px;
  }
}

.highlight {
  background: var(--code-bg);
  border-radius: 6px;
  padding: 16px;
  margin: 16px 0;
  border: 1px solid var(--code-border);
}

details {
  margin-bottom: 16px;
}

summary {
  cursor: pointer;
  font-weight: 600;
  padding: 8px 0;
}

details[open] summary {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 8px;
}

.footnote-ref {
  vertical-align: super;
  font-size: 0.8em;
}

.footnote-definition {
  border-top: 1px solid var(--border-color);
  padding-top: 8px;
  margin-top: 16px;
  font-size: 0.9em;
}

kbd {
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 3px;
  box-shadow: inset 0 -1px 0 var(--code-border);
  color: var(--code-color);
  display: inline-block;
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 11px;
  line-height: 10px;
  padding: 3px 5px;
  vertical-align: middle;
}

.alert {
  padding: 16px;
  margin-bottom: 16px;
  border-left: 4px solid var(--link-color);
  border-radius: 0 6px 6px 0;
  background-color: var(--quote-bg);
}

.alert-info {
  border-left-color: var(--link-color);
}

.alert-warning {
  border-left-color: #fb8500;
}

.alert-danger {
  border-left-color: #dc3545;
}

.alert-success {
  border-left-color: #28a745;
}
