/* === Font Faces === */

/* MLModern */
@font-face {
  font-display: swap;
  font-family: 'MLModern';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/mlmodern-regular.woff2') format('woff2');
}
@font-face {
  font-display: swap;
  font-family: 'MLModern';
  font-style: normal;
  font-weight: 700;
  src: url('/fonts/mlmodern-bold.woff2') format('woff2');
}
@font-face {
  font-display: swap;
  font-family: 'MLModern';
  font-style: italic;
  font-weight: 400;
  src: url('/fonts/mlmodern-italic.woff2') format('woff2');
}

/* M PLUS 1 - Latin */
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/m-plus-1-v6-latin_latin-ext-regular.woff') format('woff');
  unicode-range: U+0000-U+017F;
}
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1';
  font-style: normal;
  font-weight: 700;
  src: url('/fonts/m-plus-1-v6-latin_latin-ext-700.woff') format('woff');
  unicode-range: U+0000-U+017F;
}

/* M PLUS 1 - Japanese/CJK */
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/m-plus-1-v6-japanese-regular.woff') format('woff');
  unicode-range: U+0180-U+FFFF;
}
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1';
  font-style: normal;
  font-weight: 700;
  src: url('/fonts/m-plus-1-v6-japanese-700.woff') format('woff');
  unicode-range: U+0180-U+FFFF;
}

/* M PLUS 1 Code */
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1 Code';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/m-plus-1-code-v7-latin-regular.woff2') format('woff2'),
       url('/fonts/m-plus-1-code-v7-latin-regular.woff') format('woff');
}
@font-face {
  font-display: swap;
  font-family: 'M PLUS 1 Code';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/m-plus-1-code-v7-japanese-regular.woff2') format('woff2'),
       url('/fonts/m-plus-1-code-v7-japanese-regular.woff') format('woff');
  unicode-range: U+0180-U+FFFF;
}

/* === CSS Custom Properties === */

:root {
  --bg: #fff;
  --fg: #444;
  --fg-heading: #222;
  --link: #3273dc;
  --link-visited: #8b6fcb;
  --nav-bg: #e8e8e8;
  --code-bg: #f2f2f2;
  --blockquote-border: #999;
  --blockquote-fg: #222;
  --helptext: #777;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #333;
    --fg: #ddd;
    --fg-heading: #eee;
    --link: #8cc2dd;
    --link-visited: #b8a2e0;
    --nav-bg: #444;
    --code-bg: #555;
    --blockquote-border: #888;
    --blockquote-fg: #ccc;
    --helptext: #aaa;
  }
}

[data-theme="dark"] {
  --bg: #333;
  --fg: #ddd;
  --fg-heading: #eee;
  --link: #8cc2dd;
  --link-visited: #b8a2e0;
  --nav-bg: #444;
  --code-bg: #555;
  --blockquote-border: #888;
  --blockquote-fg: #ccc;
  --helptext: #aaa;
}

/* === Base Styles === */

body {
  font-family: 'MLModern', serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  color: var(--fg);
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.5;
  font-size: 12pt;
}

html[lang="zh-cn"] body {
  font-family: sans-serif;
}

html[lang="zh-cn"] .site-header,
html[lang="zh-cn"] .site-nav,
html[lang="zh-cn"] .site-footer {
  font-family: 'M PLUS 1', sans-serif;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'M PLUS 1', sans-serif;
  color: var(--fg-heading);
}

strong, b {
  color: var(--fg-heading);
}

a {
  color: var(--link);
}

a:visited {
  color: var(--link-visited);
}

/* === Layout === */

/* Header — 3-column flex: social | title | spacer */
.site-header {
  padding: 1.5rem 1rem;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 896px;
  margin: 0 auto;
}

.social-icons {
  display: flex;
  gap: 0.75rem;
  flex: 1;
}

.social-icons a {
  color: var(--fg-heading);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.social-icons svg {
  width: 20px;
  height: 20px;
}

.site-title {
  flex: 0 auto;
  text-decoration: none;
  color: var(--fg-heading);
}

.site-header a {
  text-decoration: none;
  color: var(--fg-heading);
}

.site-header h1 {
  margin: 0;
  font-size: 2rem;
}

.header-spacer {
  flex: 1;
}

/* Nav */
.site-nav {
  background: var(--nav-bg);
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-wrap: wrap;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg);
  padding: 0.25rem;
}

.hamburger svg {
  width: 24px;
  height: 24px;
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-links a {
  text-decoration: none;
  font-family: 'M PLUS 1', sans-serif;
}

/* Theme toggle — SVG icons */
.theme-toggle {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg);
  padding: 0.25rem 0.5rem;
  display: inline-flex;
  align-items: center;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Light mode (default): show moon, hide sun */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

/* Dark via prefers-color-scheme (no explicit data-theme) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* Explicit dark */
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Explicit light */
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.site-main {
  max-width: 896px;
  margin: 0 auto;
  padding: 20px;
}

.site-footer {
  background: var(--nav-bg);
  text-align: center;
  padding: 25px;
  font-family: 'M PLUS 1', sans-serif;
  font-size: small;
}

/* === Content === */

.content {
  line-height: 1.6;
}

img {
  max-width: 100%;
}

table {
  display: block;
  overflow-x: auto;
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border: 1px solid var(--blockquote-border);
  padding: 0.5rem;
}

code {
  font-family: 'M PLUS 1 Code', monospace;
  padding: 2px 5px;
  background-color: var(--code-bg);
}

pre code {
  color: var(--fg);
  display: block;
  padding: 20px;
  white-space: pre-wrap;
  font-size: 14px;
  overflow-x: auto;
}

div.highlight pre {
  background-color: initial;
  color: initial;
}

div.highlight code {
  background-color: unset;
  color: unset;
}

blockquote {
  border-left: 1px solid var(--blockquote-border);
  color: var(--blockquote-fg);
  padding-left: 20px;
  font-style: italic;
}

textarea, input {
  font-size: 16px;
  background-color: var(--bg);
  color: var(--fg);
}

.helptext {
  color: var(--helptext);
  font-size: small;
}

.footnotes {
  font-size: 90%;
}

/* === Tagline === */

.tagline {
  font-size: 16pt;
  font-style: italic;
  margin: -0.5rem 0 1rem;
  color: var(--fg);
}

/* === Blog Post List === */

ul.blog-posts {
  list-style-type: none;
  padding: unset;
}

ul.blog-posts li {
  margin-bottom: 1.25rem;
}

ul.blog-posts .post-header {
  display: flex;
}

ul.blog-posts .post-header span {
  flex: 0 0 130px;
}

ul.blog-posts .post-header a:visited {
  color: var(--link-visited);
}

.post-summary {
  margin: 0.25rem 0 0;
  color: var(--fg);
  font-size: 0.9em;
}

/* === Responsive === */

@media (max-width: 600px) {
  .site-nav {
    justify-content: space-between;
    gap: 0;
  }

  .hamburger {
    display: block;
    order: -1;
  }

  .theme-toggle {
    position: static;
    order: 1;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    order: 2;
  }

  .nav-links.open {
    display: flex;
  }

  ul.blog-posts .post-header {
    flex-direction: column;
  }

  ul.blog-posts .post-header span {
    flex: none;
  }
}