/*
 * Markdown Theme — Complete standalone stylesheet
 *
 * Inspired by the Markdown Viewer app: content is rendered with visible,
 * dimmed markdown syntax markers in a left gutter column.
 * Supports Dark, Dark-Alt, Light, and Light-Alt themes.
 */

/* ============================================
 * Variables
 * ============================================ */

:root {
  --gutter-width: 80px;
  --gutter-gap: 16px;
  --gutter-total: calc(var(--gutter-width) + var(--gutter-gap));
  --mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Cascadia Code', Menlo, Monaco, 'Courier New', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

:root, [data-theme="dark"] {
  --bg: #000;
  --surface: #111;
  --text: #d4d4d4;
  --text-dim: rgba(212, 212, 212, 0.35);
  --accent: #f8991d;
  --border: rgba(212, 212, 212, 0.1);
  --h1-color: #f8991d;
  --h2-color: #e0af68;
  --h3-color: #9ece6a;
  --h4-color: #7dcfff;
  --h5-color: #bb9af7;
  --h6-color: rgba(212, 212, 212, 0.7);
  --link-color: #f8991d;
  --code-bg: rgba(255, 255, 255, 0.06);
  --code-text: #e0af68;
  --code-inline-bg: rgba(255, 255, 255, 0.08);
  --blockquote-border: #f8991d;
  --blockquote-text: rgba(212, 212, 212, 0.7);
  --table-header-bg: #111;
  --table-stripe: rgba(255, 255, 255, 0.03);
  --table-border: rgba(212, 212, 212, 0.1);
  --strong-color: #fff;
  --em-color: rgba(212, 212, 212, 0.85);
  --input-bg: #111;
  --input-border: rgba(212, 212, 212, 0.2);
  --input-text: #d4d4d4;
  --btn-bg: #f8991d;
  --btn-text: #000;
  --hl-comment: #565f89;
  --hl-keyword: #bb9af7;
  --hl-string: #9ece6a;
  --hl-number: #ff9e64;
  --hl-function: #7aa2f7;
  --hl-tag: #f7768e;
  --hl-attr: #7dcfff;
  --hl-builtin: #e0af68;
  --hl-operator: #89ddff;
}

[data-theme="dark-alt"] {
  --bg: #0b1238;
  --surface: #1c2349;
  --text: #f8f2ee;
  --text-dim: rgba(248, 242, 238, 0.4);
  --accent: #f8991d;
  --border: rgba(248, 242, 238, 0.1);
  --h1-color: #f8991d;
  --h2-color: #e0af68;
  --h3-color: #9ece6a;
  --h4-color: #7dcfff;
  --h5-color: #bb9af7;
  --h6-color: rgba(248, 242, 238, 0.7);
  --link-color: #f8991d;
  --code-bg: rgba(51, 68, 135, 0.3);
  --code-text: #e0af68;
  --code-inline-bg: rgba(51, 68, 135, 0.4);
  --blockquote-border: #f8991d;
  --blockquote-text: rgba(248, 242, 238, 0.7);
  --table-header-bg: #1c2349;
  --table-stripe: rgba(248, 242, 238, 0.03);
  --table-border: rgba(248, 242, 238, 0.1);
  --strong-color: #fff;
  --em-color: rgba(248, 242, 238, 0.8);
  --input-bg: #1c2349;
  --input-border: rgba(248, 242, 238, 0.2);
  --input-text: #f8f2ee;
  --btn-bg: #f8991d;
  --btn-text: #0b1238;
  --hl-comment: #565f89;
  --hl-keyword: #bb9af7;
  --hl-string: #9ece6a;
  --hl-number: #ff9e64;
  --hl-function: #7aa2f7;
  --hl-tag: #f7768e;
  --hl-attr: #7dcfff;
  --hl-builtin: #e0af68;
  --hl-operator: #89ddff;
}

[data-theme="light-alt"] {
  --bg: #f8f2ee;
  --surface: #ebe1e1;
  --text: #381e1e;
  --text-dim: rgba(56, 30, 30, 0.35);
  --accent: #9a9fd8;
  --border: rgba(56, 30, 30, 0.1);
  --h1-color: #381e1e;
  --h2-color: #666b8e;
  --h3-color: #ff9a68;
  --h4-color: #9a9fd8;
  --h5-color: #ff8082;
  --h6-color: rgba(56, 30, 30, 0.6);
  --link-color: #9a9fd8;
  --code-bg: rgba(56, 30, 30, 0.06);
  --code-text: #666b8e;
  --code-inline-bg: rgba(56, 30, 30, 0.08);
  --blockquote-border: #ff9a68;
  --blockquote-text: rgba(56, 30, 30, 0.7);
  --table-header-bg: #ebe1e1;
  --table-stripe: rgba(56, 30, 30, 0.03);
  --table-border: rgba(56, 30, 30, 0.1);
  --strong-color: #1a0a0a;
  --em-color: rgba(56, 30, 30, 0.8);
  --input-bg: #ebe1e1;
  --input-border: rgba(56, 30, 30, 0.2);
  --input-text: #381e1e;
  --btn-bg: #9a9fd8;
  --btn-text: #f8f2ee;
  --hl-comment: #999;
  --hl-keyword: #069;
  --hl-string: #d44950;
  --hl-number: #f60;
  --hl-function: #c0f;
  --hl-tag: #2f6f9f;
  --hl-attr: #4f9fcf;
  --hl-builtin: #366;
  --hl-operator: #555;
}

[data-theme="light"] {
  --bg: #fff;
  --surface: #f5f5f5;
  --text: #1a1a1a;
  --text-dim: rgba(26, 26, 26, 0.3);
  --accent: #9a9fd8;
  --border: rgba(26, 26, 26, 0.1);
  --h1-color: #1a1a1a;
  --h2-color: #666b8e;
  --h3-color: #ff9a68;
  --h4-color: #9a9fd8;
  --h5-color: #ff8082;
  --h6-color: rgba(26, 26, 26, 0.6);
  --link-color: #9a9fd8;
  --code-bg: rgba(0, 0, 0, 0.04);
  --code-text: #666b8e;
  --code-inline-bg: rgba(0, 0, 0, 0.06);
  --blockquote-border: #ff9a68;
  --blockquote-text: rgba(26, 26, 26, 0.7);
  --table-header-bg: #f5f5f5;
  --table-stripe: rgba(0, 0, 0, 0.02);
  --table-border: rgba(26, 26, 26, 0.1);
  --strong-color: #000;
  --em-color: rgba(26, 26, 26, 0.8);
  --input-bg: #f5f5f5;
  --input-border: rgba(26, 26, 26, 0.2);
  --input-text: #1a1a1a;
  --btn-bg: #9a9fd8;
  --btn-text: #fff;
  --hl-comment: #999;
  --hl-keyword: #069;
  --hl-string: #d44950;
  --hl-number: #f60;
  --hl-function: #c0f;
  --hl-tag: #2f6f9f;
  --hl-attr: #4f9fcf;
  --hl-builtin: #366;
  --hl-operator: #555;
}


/* ============================================
 * Reset & Base
 * ============================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

body {
  color: var(--text);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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


/* ============================================
 * Links
 * ============================================ */

a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
a:hover, a:focus { border-bottom-color: var(--link-color); }
a strong { color: inherit; }


/* ============================================
 * Typography
 * ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
}

h1 { color: var(--h1-color); font-size: 1.7rem; margin-top: 0; }
h2 { color: var(--h2-color); font-size: 1.35rem; }
h3 { color: var(--h3-color); font-size: 1.15rem; }
h4 { color: var(--h4-color); font-size: 1rem; }
h5 { color: var(--h5-color); font-size: 0.9rem; }
h6 { color: var(--h6-color); font-size: 0.85rem; }

p { margin: 0 0 1rem; }
strong { color: var(--strong-color); }
em { color: var(--em-color); }


/* ============================================
 * Container
 * ============================================ */

.container {
  max-width: 52rem;
  padding: 0 1.5rem;
  margin: 0 auto;
}


/* ============================================
 * Masthead
 * ============================================ */

.masthead {
  padding: 1rem 0;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.masthead-title {
  margin: 0;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.masthead-title a {
  color: var(--text);
  border-bottom: none;
}
.masthead-title a:hover { color: var(--accent); border-bottom: none; }
.masthead-title a::before,
.masthead-title a::after { content: none; }

.masthead-title small {
  font-size: 75%;
  font-weight: 400;
  color: var(--text-dim);
}

.masthead .separator { color: var(--text-dim); }

@media (max-width: 48em) {
  .masthead-title { justify-content: center; }
  .masthead-title small { display: none; }
}


/* ============================================
 * Theme Toggle
 * ============================================ */

.theme-toggle {
  display: inline-flex;
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.theme-toggle button {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 0.2rem 0.5rem;
  font: 0.7rem var(--mono);
  cursor: pointer;
  transition: all 0.15s ease;
  text-transform: lowercase;
}
.theme-toggle button:hover { color: var(--text); background: var(--surface); }
.theme-toggle button.active { color: var(--accent); background: var(--surface); }
.theme-toggle button + button { border-left: 1px solid var(--border); }


/* ============================================
 * Gutter Layout
 *
 * Every direct child of .content gets a left
 * margin. Gutter markers are positioned into
 * that space via absolute positioning.
 * ============================================ */

/* Pad the entire content area to create gutter space */
.content {
  padding-left: var(--gutter-total);
}

/* Elements that need gutter markers need relative positioning */
.content h1, .content h2, .content h3,
.content h4, .content h5, .content h6,
.content blockquote,
.content hr,
.content .highlighter-rouge {
  position: relative;
}


/* ============================================
 * Gutter Markers — Headings
 * ============================================ */

/* Shared gutter marker positioning */
h1::before, h2::before, h3::before,
h4::before, h5::before, h6::before {
  position: absolute;
  right: calc(100% + var(--gutter-gap));
  top: 0;
  width: var(--gutter-width);
  text-align: right;
  font: normal 0.75em/inherit var(--mono);
  user-select: none;
  opacity: 0.5;
}

h1::before { content: '#'; color: var(--h1-color); }
h2::before { content: '##'; color: var(--h2-color); }
h3::before { content: '###'; color: var(--h3-color); }
h4::before { content: '####'; color: var(--h4-color); }
h5::before { content: '#####'; color: var(--h5-color); }
h6::before { content: '######'; color: var(--h6-color); }

/* Index post titles are h2 but should show # (they're the title) */
.post-title::before {
  content: '#' !important;
  color: var(--h1-color) !important;
}


/* ============================================
 * Gutter Markers — Blockquotes
 * ============================================ */

blockquote {
  border-left: 3px solid var(--blockquote-border);
  color: var(--blockquote-text);
  background: transparent;
  padding: 0.5rem 1rem;
  margin: 0.8rem 0;
  font-style: italic;
  position: relative;
}
blockquote p:last-child { margin-bottom: 0; }

blockquote::before {
  content: '>';
  position: absolute;
  right: calc(100% + var(--gutter-gap) + 3px);
  top: 0.5rem;
  width: var(--gutter-width);
  text-align: right;
  font: normal 0.8em/1 var(--mono);
  color: var(--text-dim);
  user-select: none;
  opacity: 0.5;
}


/* ============================================
 * Gutter Markers — Lists
 * ============================================ */

ul, ol, dl { margin: 0 0 1rem; }
dt { font-weight: bold; }
dd { margin-bottom: 0.5rem; }

ul {
  list-style: none;
  padding-left: 0;
}

ul > li {
  position: relative;
  padding-left: 1.2em;
}

ul > li::before {
  content: '-';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
}

ul ul { margin-left: 0; }

ol { padding-left: 1.5em; }

ol > li::marker {
  color: var(--accent);
  font-family: var(--mono);
}


/* ============================================
 * Gutter Markers — Code Blocks (language)
 * ============================================ */

.highlighter-rouge {
  position: relative;
}

.highlighter-rouge[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  right: calc(100% + var(--gutter-gap));
  top: 14px;
  width: var(--gutter-width);
  text-align: right;
  font: 0.7rem var(--mono);
  color: var(--text-dim);
  user-select: none;
  opacity: 0.6;
  text-transform: lowercase;
}


/* ============================================
 * Gutter Markers — Horizontal Rules
 * ============================================ */

hr {
  border: 0;
  overflow: visible;
  height: auto;
  margin: 2rem 0;
  position: relative;
}

hr::before {
  content: '---';
  position: absolute;
  right: calc(100% + var(--gutter-gap));
  top: -0.5em;
  width: var(--gutter-width);
  text-align: right;
  font: 0.8em var(--mono);
  color: var(--text-dim);
  user-select: none;
  opacity: 0.5;
}

hr::after {
  content: '';
  display: block;
  border-top: 1px solid var(--border);
}


/* ============================================
 * Inline Syntax Markers
 * ============================================ */

/* Bold */
.post strong::before, .post strong::after,
.page-content strong::before, .page-content strong::after {
  content: '**';
  color: var(--text-dim);
  font: normal 0.85em var(--mono);
  user-select: none;
}

/* Italic */
.post em::before, .post em::after,
.page-content em::before, .page-content em::after {
  color: var(--text-dim);
  font: normal 0.85em var(--mono);
  font-style: normal;
  user-select: none;
}
.post em::before, .page-content em::before { content: '*'; }
.post em::after, .page-content em::after { content: '*'; }

/* Inline code backticks */
:not(pre) > code::before,
:not(pre) > code::after {
  color: var(--text-dim);
  font-weight: normal;
  user-select: none;
}
:not(pre) > code::before { content: '`'; }
:not(pre) > code::after { content: '`'; }
pre code::before, pre code::after { content: none !important; }

/* Link brackets */
.post p a::before, .post li a::before,
.page-content p a::before, .page-content li a::before {
  content: '[';
  color: var(--text-dim);
  font: 0.85em var(--mono);
  user-select: none;
}
.post p a::after, .post li a::after,
.page-content p a::after, .page-content li a::after {
  content: '](' attr(href) ')';
  color: var(--text-dim);
  font: 0.85em var(--mono);
  user-select: none;
}

/* Exclude nav/UI links */
.masthead-title a::before, .masthead-title a::after,
.post-title a::before, .post-title a::after,
a.pagination-item::before, a.pagination-item::after,
.post-excerpt + p a::before, .post-excerpt + p a::after,
.newsletter-signup a::before, .newsletter-signup a::after {
  content: none !important;
}


/* ============================================
 * Code & Syntax Highlighting
 * ============================================ */

code, pre { font-family: var(--mono); }

code {
  padding: 0.2em 0.4em;
  font-size: 0.85em;
  color: var(--code-text);
  background: var(--code-inline-bg);
  border-radius: 4px;
}

pre {
  display: block;
  margin: 0 0 1rem;
  padding: 14px 16px;
  font-size: 0.8rem;
  line-height: 1.6;
  overflow-x: auto;
  background: var(--code-bg);
  border-radius: 6px;
  color: var(--text);
}

pre code {
  padding: 0;
  font-size: 100%;
  color: inherit;
  background: transparent;
  border-radius: 0;
}

.highlight {
  margin-bottom: 1rem;
  border-radius: 6px;
  background: var(--code-bg);
}
.highlight pre { margin-bottom: 0; }

/* Pygments token colors — driven by theme variables */
.highlight .hll { background-color: rgba(255, 255, 200, 0.15); }
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cs { color: var(--hl-comment); }
.highlight .k, .highlight .kc, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr { color: var(--hl-keyword); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sh, .highlight .sx, .highlight .sd { color: var(--hl-string); }
.highlight .m, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .mo, .highlight .il { color: var(--hl-number); }
.highlight .nf, .highlight .nc { color: var(--hl-function); }
.highlight .nt { color: var(--hl-tag); }
.highlight .na { color: var(--hl-attr); }
.highlight .nb, .highlight .bp { color: var(--hl-builtin); }
.highlight .o, .highlight .ow { color: var(--hl-operator); }
.highlight .nv, .highlight .vc, .highlight .vg, .highlight .vi { color: var(--text); }
.highlight .err { color: var(--hl-tag); background: transparent; }
.highlight .ge { font-style: italic; }
.highlight .gs { font-weight: bold; }
.highlight .gd { color: var(--hl-tag); }
.highlight .gi { color: var(--hl-string); }
.highlight .w { color: var(--text-dim); }
.highlight .no { color: var(--hl-number); }
.highlight .nd, .highlight .nl { color: var(--hl-attr); }
.highlight .nn { color: var(--hl-attr); }
.highlight .ne { color: var(--hl-tag); }
.highlight .sr { color: var(--hl-string); }
.highlight .ss { color: var(--hl-number); }
.highlight .se { color: var(--hl-number); }
.highlight .si { color: var(--hl-tag); }
.highlight .kt { color: var(--hl-attr); }
.highlight .cp { color: var(--hl-attr); }
.highlight .gp { color: var(--hl-comment); }
.highlight .go { color: var(--text-dim); }
.highlight .gh, .highlight .gu { color: var(--hl-function); }


/* ============================================
 * Tables
 * ============================================ */

table {
  margin-bottom: 1rem;
  width: 100%;
  border: 1px solid var(--table-border);
  border-collapse: collapse;
  font-size: 0.85rem;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}
th {
  padding: 8px 16px;
  border: 1px solid var(--table-border);
  background: var(--table-header-bg);
  color: var(--strong-color);
  font-weight: 600;
}
td {
  padding: 8px 16px;
  border: 1px solid var(--table-border);
}
tbody tr:nth-child(odd) td { background: var(--table-stripe); }
tbody tr:hover td { background: var(--surface); }


/* ============================================
 * Images
 * ============================================ */

img {
  display: block;
  max-width: 100%;
  margin: 0 0 1rem;
  border-radius: 6px;
}


/* ============================================
 * Posts & Pages
 * ============================================ */

.page, .post { margin-bottom: 4em; }

.page-title,
.post-title,
.post-title a { color: var(--h1-color); }

.post-title a { border-bottom: none; }
.post-title a:hover { border-bottom: 1px solid var(--h1-color); }

.page-title, .post-title { margin-top: 0; }

.post-date {
  display: block;
  margin-top: -0.5rem;
  margin-bottom: 1rem;
  color: var(--text-dim);
  font: 0.8rem var(--mono);
}

.post-excerpt { color: var(--text); }

.post-excerpt + p a {
  font: 0.85em var(--mono);
  color: var(--accent);
}


/* ============================================
 * Pagination
 * ============================================ */

.pagination {
  overflow: hidden;
  margin: 3rem 0;
  font-family: var(--mono);
  color: var(--text-dim);
  text-align: center;
  font-size: 0.85rem;
}
.pagination-item {
  display: block;
  padding: 1rem;
  border: 1px solid var(--border);
}
.pagination-item:first-child { margin-bottom: -1px; }
a.pagination-item { color: var(--accent); }
a.pagination-item:hover { background: var(--surface); border-bottom-color: var(--border); }

@media (min-width: 30em) {
  .pagination-item {
    float: left;
    width: 50%;
  }
  .pagination-item:first-child {
    margin-bottom: 0;
    border-radius: 4px 0 0 4px;
  }
  .pagination-item:last-child {
    margin-left: -1px;
    border-radius: 0 4px 4px 0;
  }
}


/* ============================================
 * Newsletter Signup
 * ============================================ */

.newsletter-signup { margin-top: 2rem; }
.newsletter-signup label { color: var(--text-dim); }

.newsletter-signup input[type="email"] {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--input-text);
  font-size: 16px;
  padding: 8px;
  width: 50%;
  border-radius: 4px;
}
.newsletter-signup input[type="email"]:focus {
  border-color: var(--accent);
  outline: none;
}

.newsletter-signup input[type="submit"] {
  background: var(--btn-bg);
  border: 1px solid var(--btn-bg);
  color: var(--btn-text);
  font-size: 16px;
  padding: 8px 16px;
  cursor: pointer;
  border-radius: 4px;
  font-weight: 600;
}
.newsletter-signup input[type="submit"]:hover { opacity: 0.85; }


/* ============================================
 * Misc
 * ============================================ */

abbr {
  font-size: 85%;
  font-weight: bold;
  color: var(--text);
  text-transform: uppercase;
}
abbr[title] { cursor: help; border-bottom: 1px dotted var(--border); }

/* Gist embeds */
.gist .gist-file { font-family: var(--mono) !important; }
.gist .markdown-body { padding: 15px; }
.gist pre { padding: 0; background: transparent; }
.gist code { padding: 0; color: inherit; background: transparent; border-radius: 0; }


/* ============================================
 * Scrollbar
 * ============================================ */

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }


/* ============================================
 * Responsive — collapse gutter on small screens
 * ============================================ */

@media (max-width: 40em) {
  :root {
    --gutter-width: 0px;
    --gutter-gap: 0px;
    --gutter-total: 0px;
  }

  .content {
    padding-left: 0;
  }

  /* Show heading markers inline instead of gutter */
  h1::before, h2::before, h3::before,
  h4::before, h5::before, h6::before {
    position: static;
    display: inline;
    width: auto;
    text-align: left;
    margin-right: 0.4em;
  }

  /* Hide gutter-only markers */
  blockquote::before,
  hr::before,
  .highlighter-rouge[data-lang]::before {
    display: none;
  }
}


/* ============================================
 * Accessibility
 * ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}