:root {
  --background-color: #f4f4f4;
  --text-color: #111111;
  --base-variant-color: #e0e0e0;
  --pre-background-color: #cdd4dd;
  --pre-content-background-color: #cbced3;
  --link-color: #754ea5;
  transition: background-color 0.3s ease, color 0.3s ease, fill 0.3s ease;
}

[data-theme="dark"] {
  --background-color: #111111;
  --text-color: #bdbdbd;
  --base-variant-color: #303030;
  --pre-background-color: #181f29;
  --pre-content-background-color: #202023;
  --link-color: #a78bfa;
}

html {
  font-family: 'Cascadia Code', Consolas, 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
}

body {
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0 auto;
  padding: 0 14px;
  box-sizing: border-box;
  max-width: 1000px;
  min-height: 100vh;
}

@media (max-width: 1023px) {
.toc-container {
    top: 4em;
    right: 0.5em;
    width: 90vw;
    max-height: 80vh;
    font-size: 0.95em;
    border-left: none;
    border-right: 4px solid var(--text-color);
  }

  .toc-container.expanded {
    transform: translateX(0%);
  }

  .toc-container.collapsed {
    transform: translateX(110%);
  }
  body {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  img,
  video,
  iframe {
    max-width: 100%;
    height: auto;
  }
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --background-color: #111111;
    --text-color: #bdbdbd;
    --base-variant-color: #303030;
    --pre-background-color: #181f29;
    --pre-content-background-color: #202023;
    --link-color: #a78bfa;
  }
  img,
  video,
  iframe {
    filter: brightness(0.9);
  }
}

.navigation-bar {
  height: 20px;
  padding: 40px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--text-color);
}

.navigation-bar .menu {
  margin-right: -9px;
  text-align: right;
  user-select: none;
}

.navigation-bar .menu a {
  display: inline-block;
  font-size: 20px;
  color: var(--text-color);
  margin: 4px 9px;
  white-space: nowrap;
  user-select: none;
  transition: color 0.3s ease;
}

.navigation-bar img {
  filter: brightness(1);
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  -webkit-user-drag: none;
  user-select: none;
  box-shadow: 0 0 6px 1px rgba(0, 0, 0, 0.18);
  transition: box-shadow 0.3s ease;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

p {
  color: var(--text-color);
}

code {
  font-family: Consolas, 'Courier New', monospace;
  padding: 2px;
  font-size: 105%;
}

pre {
  position: relative;
  line-height: 1.4;
  padding-left: 20px;
  overflow-x: auto;
  overflow-y: hidden;
  background-color: var(--pre-background-color);
  transition: background-color 0.3s ease;
}

.pre_content {
  position: relative;
  background-color: var(--pre-content-background-color);
  color: var(--text-color);
}

.copy {
  position: relative;
  top: 6px;
  left: 10px;
  background-color: var(--pre-background-color);
  color: var(--text-color);
  border: 1px solid #000;
  border-radius: 12px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .copy {
  border-color: #fff;
}

#theme-switch {
  border: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  background-color: var(--base-variant-color);
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#theme-switch svg {
  fill: var(--text-color);
  transition: fill 0.3s ease;
}

#theme-switch svg:last-child {
  display: none;
}

[data-theme="dark"] #theme-switch svg:first-child {
  display: none;
}

[data-theme="dark"] #theme-switch svg:last-child {
  display: block;
}

.modal.hidden {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.45);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background-color: var(--background-color);
  color: var(--text-color);
  padding: 1.6em 2.2em;
  border-radius: 8px;
  max-width: 90%;
  width: 360px;
  text-align: center;
  box-shadow: 0 0 8px rgba(0,0,0,0.2);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.modal-content p {
  margin-bottom: 1.5em;
  font-size: 14pt;
  line-height: 1.6;
  color: var(--text-color);
}

.modal-actions {
  display: flex;
  justify-content: center;
  gap: 1.2em;
}

.modal-actions button {
  background-color: var(--base-variant-color);
  color: var(--text-color);
  border: none;
  padding: 0.6em 1.4em;
  font-size: 12pt;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.modal-actions button:hover {
  background-color: var(--link-color);
  color: #fff;
}

.hljs {
  background: var(--pre-background-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.hljs-keyword,
.hljs-type,
.hljs-built_in {
  color: #d73a49;
}

.hljs-function,
.hljs-title.function_ {
  color: #6f42c1;
}

.hljs-number,
.hljs-literal,
.hljs-symbol,
.hljs-operator {
  color: #207de7;
}

.hljs-string,
.hljs-regexp {
  color: #4281c9;
}

.hljs-comment,
.hljs-code {
  color: #6a737d;
}

.hljs-variable,
.hljs-params {
  color: #22863a;
}

.hljs-subst {
  color: #24292e;
}

.hljs-section {
  color: #207de7;
  font-weight: bold;
}

.hljs-emphasis {
  color: #24292e;
  font-style: italic;
}

.hljs-strong {
  color: #24292e;
  font-weight: bold;
}

.hljs-addition {
  color: #22863a;
  background-color: #f0fff4;
}

.hljs-deletion {
  color: #b31d28;
  background-color: #ffeef0;
}

[data-theme="dark"] .hljs-comment,
[data-theme="dark"] .hljs-code {
  color: #8b949e;
}

[data-theme="dark"] .hljs-subst,
[data-theme="dark"] .hljs-emphasis,
[data-theme="dark"] .hljs-strong {
  color: #c9d1d9;
}

[data-theme="dark"] .hljs-addition {
  background-color: #013220;
}

[data-theme="dark"] .hljs-deletion {
  background-color: #4b0c0e;
}

img {
  max-width: 100%;
  max-width: min(100%, 1000px);
  height: auto;
}

video {
  max-width: 100%;
  max-width: min(100%, 1000px);
}

.toc-container {
  position: fixed;
  top: 6em;
  right: 2em;
  width: 250px;
  max-height: 70vh;
  overflow-y: auto;
  padding: 1em 1.2em;
  background-color: var(--background-color);
  border-left: 4px solid var(--text-color);
  border-radius: 4px;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.1);
  font-size: 0.9em;
  z-index: 100;
  transition: transform 0.3s ease;
}

.toc-container.expanded {
  transform: translateX(0%);
  max-height: 80vh;
}
.toc-container.collapsed {
  transform: translateX(110%);
}

.toc-toggle-btn {
  background-color: var(--background-color);
  border: 1px solid var(--text-color);
  border-radius: 4px;
  padding: 0.4em 0.8em;
  cursor: pointer;
  font-size: 0.85em;
  color: var(--text-color);
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  right: 20px;
  bottom: 70px; /* 主題按鈕 20px + 間距 10px + 自身高 40px */
  z-index: 1;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.toc-toggle-btn:hover {
  background-color: var(--text-color);
  color: white;
}

.toc {
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

.toc li {
  list-style: none;
  margin: 0.3em 0;
  padding-left: 0.5em;
}

.toc li a {
  color: var(--text-color);
  text-decoration: none;
}

.toc li a:hover {
  text-decoration: underline;
}

.toc .toc-level-2 { margin-left: 1em; }
.toc .toc-level-3 { margin-left: 2em; }
.toc .toc-level-4 { margin-left: 3em; }