/* ==============================
   Common
   ============================== */

/* ---- Fonts (self-hosted) ---- */

/* Serif: body text */

@font-face {
  font-family: "Source Serif Pro";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/vendor/fonts/source-serif-400.woff2") format("woff2");
}

@font-face {
  font-family: "Source Serif Pro";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/vendor/fonts/source-serif-400i.woff2") format("woff2");
}

@font-face {
  font-family: "Source Serif Pro";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/vendor/fonts/source-serif-600.woff2") format("woff2");
}

@font-face {
  font-family: "Source Serif Pro";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/vendor/fonts/source-serif-700.woff2") format("woff2");
}

/* Sans: UI text */

@font-face {
  font-family: "Source Sans Pro";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/vendor/fonts/source-sans-400.woff2") format("woff2");
}

@font-face {
  font-family: "Source Sans Pro";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/vendor/fonts/source-sans-400i.woff2") format("woff2");
}

@font-face {
  font-family: "Source Sans Pro";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/vendor/fonts/source-sans-600.woff2") format("woff2");
}

/* ---- Design tokens ---- */

:root {
  /* Core palette */
    --primary:     #5a67d8;
    --background:  #f5f6fa;
    --fill:        #ffffff;
    --text:        #2d2d3a;
    --link:        #63b3ed;
    --muted:       #7a7f8b;
    --hairline:    #e7e8ee;
    --code-bg:     #f6f7f9;
    --nav-hover:   #fde68a;
    --nav-bg:      var(--primary);
    --nav-text:    var(--fill);

    /* Typography */
    --font-serif:  "Source Serif Pro", Georgia, "Times New Roman", serif;
    --font-sans:   "Source Sans Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono:   "SF Mono", ui-monospace, Menlo, Consolas, monospace;

    /* Components */
    --scrim:          rgba(20, 22, 40, .45);
    --modal-shadow:   0 24px 60px rgba(20, 22, 40, .25);
    --tag-bg:         #eef1fb;
    --button-border:  #ddd;
    --tint:           #eceef9;
}

/* ---- Base ---- */

body {
    color: var(--text);
    background: var(--background);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}


h1 {
    font-weight: 400;
}

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

/* ==============================
   Nav
   ============================== */

nav {
  display: flex;
  align-items: center;
  gap: 1.5em;
  margin: 0;
  padding: .8rem 1.5rem;
  background: var(--nav-bg);
}

/* Theme toggle: a plain 20px icon link like search/GitHub.
   theme.js swaps the single SVG's content (icon = the state you'll switch to). */

.theme-toggle {
  margin-left: auto;
}

/* Search button (right-aligned) */

/* Links */

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

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

/* Narrow screens */

@media (max-width: 640px) {
  nav {
    gap: 1em;
    padding: .7rem 1rem;
  }
}

/* ==============================
   Search modal
   ============================== */

/* Overlay */

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12vh 1rem 2rem;
  background: var(--scrim);
}

.search-modal.hidden {
  display: none;
}

/* Panel */

.search-modal-panel {
  width: min(36em, 100%);
  background: var(--fill);
  border-radius: 12px;
  padding: 1rem 1.25rem 1.25rem;
  box-shadow: 0 24px 60px var(--modal-shadow);
}

/* Pagefind search box follows the theme.
   pagefind-ui.css is injected on demand and would win at equal
   specificity, so :root:root boosts priority and remaps its variables. */

:root:root {
  --pagefind-ui-text:       var(--text);
  --pagefind-ui-background: var(--background);
  --pagefind-ui-border:     var(--hairline);
  --pagefind-ui-primary:    var(--primary);
  --pagefind-ui-tag:        var(--tag-bg);
}

/* Magnifier icon: gray in light mode, whitish in dark mode */

#pagefind-search .pagefind-ui__form:before {
  background-color: var(--muted);
}


/* ==============================
   Reading column
   ============================== */

/* Container */

#content {
    max-width: 46em;
    margin: 0 auto;
    padding: 3rem 1.25rem 5rem;
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--text);
}

/* Titles */

#content h1.title {
    font-family: var(--font-serif);
    font-size: 2.3rem;
    font-weight: 600;
    line-height: 1.2;
    text-align: left;
    margin: 1rem 0 2.5rem;
}

#content h2 {
    font-size: 1.45rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 2.5rem 0 1rem;
}

#content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 2rem 0 .8rem;
}

#content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 1.8rem 0 .6rem;
}

/* Prose: paragraphs & links */

#content p {
  margin: 0 0 1.25rem;
}

#content a:not(.post-card) {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom-color .15s ease;
}

#content a:not(.post-card):hover {
  border-bottom-color: var(--primary);
}

/* Lists */

#content ul,
#content ol {
    padding-left: 1.6rem;
}

#content li {
  margin-bottom: .35rem;
}

/* Blockquotes, rules, images */

#content blockquote {
    margin: 1.5rem 0;
    padding: .2rem 0 .2rem 1.2rem;
    border-left: 2px solid var(--hairline);
    color: var(--muted);
}

#content hr {
    border: 0;
    border-top: 1px solid var(--hairline);
    margin: 2.5rem 0;
}

#content img {
    max-width: 100%;
    height: auto;
}

#content .figure {
  padding: 0;
}

/* Code */

#content pre {
    background: var(--code-bg);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    padding: 1rem 1.2rem;
    margin: 1.5rem 0;
    font-family: var(--font-mono);
    font-size: .9rem;
    line-height: 1.6;
    overflow-x: auto;
}

#content p code,
#content li code {
  background: var(--code-bg);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: .08em .35em;
  font-size: .88em;
}

/* Code language label (org shows it on hover; restyle only) */

pre.src::before {
  background-color: var(--background);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  color: var(--muted);
}

/* To change a language label's text, override content here, e.g.:
   pre.src-python::before { content: 'Python'; } */

/* Tables */

#content table {
    border-collapse: collapse;
    margin: 1.5rem 0;
}

#content th,
#content td {
    padding: .5rem .8rem;
    border-bottom: 1px solid var(--hairline);
    text-align: left;
}

#content th {
    font-weight: 600;
}


/* ==============================
   Posts list
   ============================== */

/* List container */

.post-list {
  display: block;
}

/* Card row */

.post-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
  color: inherit;
}

.post-card:last-child {
  border-bottom: none;
}

/* Left meta column */

.post-meta {
  flex: 0 0 8em;
  font-family: var(--font-sans);
}

.post-date {
  display: block;
  font-size: .85rem;
  letter-spacing: .03em;
  color: var(--muted);
  margin-bottom: .5rem;
}

/* Body column */

.post-body {
  flex: 1 1 auto;
  min-width: 0;
}

.post-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
  transition: color .15s ease;
}

.post-card:hover .post-title {
  color: var(--primary);
}

.post-desc {
  display: block;
  font-family: var(--font-sans);
  font-size: .95rem;
  color: var(--muted);
  margin-top: .4rem;
}

/* Cover placeholder */

.post-cover {
  flex: 0 0 104px;
  height: 78px;
  border-radius: 8px;
  background: var(--code-bg);
  border: 1px solid var(--hairline);
}

/* Tags */

.post-tags { display: block; margin-top: .5em; }
.post-tag {
  display: inline-block;
  font-size: .75em;
  padding: .1em .6em;
  margin-right: .3em;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--primary);
}

/* Tag filter */

#content:has(.tag-filter) {
  display: grid;
  grid-template-columns: 1fr minmax(8em, auto);
  grid-template-rows: auto auto;
  column-gap: 2rem;
  max-width: 50em;
}

#content:has(.tag-filter) h1.title {
  grid-column: 1;
  grid-row: 1;
  margin: 1rem 0 2rem;
}

#content:has(.tag-filter) .tag-filter {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
}

#content:has(.tag-filter) .post-list {
  grid-column: 1;
  grid-row: 2;
}

/* Filter buttons */

.tag-filter button {
  border: 1px solid var(--button-border); background: var(--fill);
  color: var(--text);
  border-radius: 999px; padding: .2em .8em; margin-right: .4em;
  cursor: pointer;
}
.tag-filter button.active { background: var(--primary); color: var(--fill); border-color: var(--primary); }

#content:has(.tag-filter) .tag-filter button {
  display: block;
  margin: 0 0 .4em;
}

/* RSS link: top-right of the title */

#content .rss-link {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  align-self: start;
  margin-top: 1.6rem;
  color: #f26522;
  text-decoration: none;
  border-bottom: none;
  transition: color .15s ease;
}

#content .rss-link:hover {
  color: #c94f10;
  border-bottom: none;
}

/* Narrow screens */

@media (max-width: 640px) {
  #content:has(.tag-filter) {
    grid-template-columns: 1fr;
    max-width: 46em;
  }

  #content:has(.tag-filter) h1.title {
    grid-row: 1;
  }

  #content .rss-link {
    grid-column: 1;
    grid-row: 2;
    justify-self: end;
    margin: 0 0 .4rem;
  }

  #content:has(.tag-filter) .tag-filter {
    grid-column: 1;
    grid-row: 3;
    margin: 0 0 1rem;
  }

  #content:has(.tag-filter) .tag-filter button {
    display: inline-block;
    margin: 0 .4em .4em 0;
  }

  #content:has(.tag-filter) .post-list {
    grid-column: 1;
    grid-row: 4;
  }
}


/* ==============================
   Table of contents
   ============================== */

/* Inline ToC under the title */

html {
  scroll-behavior: smooth;
}

#content #table-of-contents {
  font-family: var(--font-sans);
  margin: 0 0 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--hairline);
}

#content #table-of-contents::before {
  content: "Contents";
  display: block;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: .6rem;
}

#content #table-of-contents h2 {
  display: none;
}

/* Entries */

#content #table-of-contents ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
  font-size: .9rem;
  line-height: 1.6;
}

#content #table-of-contents ul ul {
  padding-left: 1.2em;
  margin-top: .15rem;
}

#content #table-of-contents li {
  margin-bottom: .3rem;
}

#content #table-of-contents a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: none;
}

#content #table-of-contents a:hover {
  color: var(--primary);
}

/* ==============================
   Article meta
   ============================== */

/* Reading time + last updated */

.article-meta {
  display: flex;
  align-items: baseline;
  gap: 1em;
  font-family: var(--font-sans);
  font-size: .85rem;
  color: var(--muted);
  margin: -1.5rem 0 2.25rem;
}

.post-updated::before {
  content: "·";
  margin-right: 1em;
}

/* ==============================
   Coming soon pages
   ============================== */

.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 4rem 1rem 5rem;
}

.coming-soon-label {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 .75rem;
}

.coming-soon-note {
  font-family: var(--font-sans);
  font-size: .95rem;
  color: var(--muted);
  max-width: 26em;
  margin: 0 0 1.5rem;
}

.coming-soon-back {
  font-family: var(--font-sans);
  font-size: .9rem;
}

/* ==============================
   About page
   ============================== */

/* Two-column grid + divider */

#content:has(.about-left) {
  position: relative;
  display: grid;
  grid-template-columns: 22em minmax(0, 1fr);
  column-gap: 3rem;
  max-width: 58em;
  align-items: start;
  background-image: linear-gradient(
    to right,
    transparent calc(22em + 1.5rem),
    var(--hairline) calc(22em + 1.5rem),
    var(--hairline) calc(22em + 1.5rem + 1px),
    transparent calc(22em + 1.5rem + 1px)
  );
}

#content:has(.about-left) h1.title {
  display: none;
}

/* Left column (sticky) */

#content:has(.about-left) > .about-left {
  grid-column: 1;
  grid-row: 1 / -1;
  position: sticky;
  top: 2rem;
  align-self: start;
}

/* Avatar */

.about-avatar {
  display: block;
  width: 100%;
  border-radius: 12px;
}

/* Name */

.about-name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  margin: 1rem 0 1.25rem;
  min-height: 2.2rem;
  text-align: center;
}

.about-links {
  display: flex;
  gap: .5rem;
  justify-content: center;
  background: var(--background);
  padding: 0;
}

/* Link buttons */

#content .about-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--primary);
  border-bottom: 1px solid var(--primary);
  border-radius: 8px;
  background: var(--background);
  color: var(--primary);
  text-decoration: none;
  transition: border-color .15s ease, background-color .15s ease;
}

#content .about-links a:hover {
  border-color: var(--primary);
  background: var(--tint);
}

.about-links img {
  width: 16px;
  height: 16px;
}


/* ==============================
   Dark theme
   ============================== */

/* data-resolved is set by theme.js (and the inline head script):
   "dark" for an explicit dark choice or system-following dark. */

:root[data-resolved="dark"] {
  --background:   #15171e;
  --fill:         #1d2028;
  --text:         #e8eaf1;
  --primary:      #9aa4ef;
  --link:         #82b7f0;
  --muted:        #9aa1b0;
  --hairline:     #2a2e3a;
  --code-bg:      #1a1d25;
  --nav-hover:    #ffe9a3;
  --nav-bg:       #444fb4;
  --nav-text:     #eef0f7;
  --scrim:        rgba(0, 0, 0, .55);
  --modal-shadow: 0 24px 60px rgba(0, 0, 0, .45);
  --tag-bg:       #2a2f40;
  --button-border: #3a4050;
  --tint:         #262b3a;
}

/* Code highlight (htmlize classes) in dark mode */

:root[data-resolved="dark"] .org-comment,
:root[data-resolved="dark"] .org-doc {
  color: #8b93a5;
}

:root[data-resolved="dark"] .org-keyword {
  color: #9aa4ef;
}

:root[data-resolved="dark"] .org-string {
  color: #7fd2a9;
}

:root[data-resolved="dark"] .org-builtin,
:root[data-resolved="dark"] .org-function-name,
:root[data-resolved="dark"] .org-preprocessor {
  color: #e8a0c8;
}

:root[data-resolved="dark"] .org-type,
:root[data-resolved="dark"] .org-constant,
:root[data-resolved="dark"] .org-variable-name {
  color: #6fc7c9;
}

:root[data-resolved="dark"] .org-escape-char {
  color: #e0b080;
}

/* KaTeX follows the text color in both themes */

#content .katex {
  color: var(--text);
}


/* ==============================
   Home page
   ============================== */

.home-links {
  display: block;
  background: none;
  padding: 0;
  margin: 2.5rem 0 0;
}

.home-link {
  display: block;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
}

.home-link:last-child {
  border-bottom: none;
}

.home-link-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  transition: color .15s ease;
}

.home-link-desc {
  display: block;
  font-family: var(--font-sans);
  font-size: .9rem;
  color: var(--muted);
  margin-top: .25rem;
}

.home-link:hover .home-link-title {
  color: var(--primary);
}