// ============================================================================
// Retro-Future Theme
// A modern, accessible theme with clean typography and thoughtful colors
// ============================================================================

// ----------------------------------------------------------------------------
// Custom Properties (CSS Variables)
// ----------------------------------------------------------------------------

:root {
  // Color Palette - Light Mode
  --color-background: oklch(98.2% 0.014 85);
  --color-text: oklch(31.55% 0.009 17.62);
  --color-text-muted: oklch(50% 0.009 17.62);
  --color-primary: oklch(62.78% 0.12 226);        // Blue
  --color-secondary: oklch(70.27% 0.192 13.7);    // Orange
  --color-accent: oklch(86.59% 0.088 168.12);     // Teal
  --color-highlight: rgb(210, 55, 81);            // Red
  --color-border: oklch(85% 0.014 85);

  // Code blocks
  --color-code-bg: #ffffff;
  --color-code-border: var(--color-primary);

  // Syntax highlighting
  --color-syntax-string: oklch(50% 0.15 155);
  --color-syntax-number: oklch(55% 0.18 50);
  --color-syntax-function: oklch(48% 0.14 240);
  --color-syntax-keyword: oklch(52% 0.16 300);
  --color-syntax-comment: oklch(60% 0.02 85);

  // Spacing Scale
  --space-xs: 0.25rem;    // 4px
  --space-sm: 0.5rem;     // 8px
  --space-md: 1rem;       // 16px
  --space-lg: 1.5rem;     // 24px
  --space-xl: 2rem;       // 32px
  --space-2xl: 3rem;      // 48px
  --space-3xl: 4rem;      // 64px

  // Typography Scale
  --font-size-sm: 0.875rem;
  --font-size-base: 1.25rem;
  --font-size-lg: 1.375rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.75rem;
  --font-size-2-5xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;
  --font-size-5xl: 4rem;

  // Font Families
  --font-body: "Atkinson Hyperlegible Next", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: "Bangers", "Comic Sans MS", cursive;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  // Line Heights
  --line-height-tight: 1.25;
  --line-height-base: 1.6;

  // Layout
  --layout-content-width: 52rem;
  --layout-padding: var(--space-md);

  // Border Radius
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;

  // Borders
  --border-accent-width: 4px;

  // Transitions
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  // Icons
  --icon-size: 18px;

  // Header bio
  --bio-photo-size: 60px;
  --bio-photo-border: 3px;
  --bio-text-max-width: 300px;

  // Scrollbar
  --scrollbar-size: 12px;
  --scrollbar-border: 2px;
}

// Dark Mode
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: oklch(31.55% 0.009 17.62);
    --color-text: oklch(98.2% 0.014 85);
    --color-text-muted: oklch(70% 0.014 85);
    --color-primary: oklch(86.59% 0.088 168.12);
    --color-secondary: oklch(80.27% 0.192 13.7);
    --color-accent: oklch(62.78% 0.12 226);
    --color-highlight: rgb(240, 85, 111);
    --color-border: oklch(45% 0.009 17.62);
    --color-code-bg: #1a1a1a;
    --color-syntax-string: oklch(72% 0.15 155);
    --color-syntax-number: oklch(75% 0.14 50);
    --color-syntax-function: oklch(75% 0.12 240);
    --color-syntax-keyword: oklch(78% 0.12 300);
    --color-syntax-comment: oklch(55% 0.02 85);
  }
}

// ----------------------------------------------------------------------------
// Web Fonts
// ----------------------------------------------------------------------------

@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible+Next:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&family=Bangers&display=swap');

// ----------------------------------------------------------------------------
// Reset & Base Styles
// ----------------------------------------------------------------------------

*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--color-primary) var(--color-background);
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

// Text selection
::selection {
  background-color: var(--color-primary);
  color: var(--color-background);
}

// Scrollbar styling
::-webkit-scrollbar {
  width: var(--scrollbar-size);
  height: var(--scrollbar-size);
}

::-webkit-scrollbar-track {
  background: var(--color-background);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: calc(var(--scrollbar-size) / 2);
  border: var(--scrollbar-border) solid var(--color-background);

  &:hover {
    background: var(--color-secondary);
  }
}

// ----------------------------------------------------------------------------
// Typography
// ----------------------------------------------------------------------------

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-md);
  color: var(--color-text);
  text-wrap: balance;
}

h1 {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
  margin-top: var(--space-2xl);
}

h2 {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-3xl));
  margin-top: var(--space-xl);
}

h3 {
  font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-2xl));
  margin-top: var(--space-lg);
}

h4 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-lg);
}

h5, h6 {
  font-size: var(--font-size-lg);
  margin-top: var(--space-md);
}

p {
  margin-bottom: var(--space-md);
  text-wrap: pretty;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);

  &:hover {
    color: var(--color-secondary);
  }

  &:focus-visible {
    outline: 2px dashed var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
  }
}

strong, b {
  font-weight: 700;
}

em, i {
  font-style: italic;
}

// ----------------------------------------------------------------------------
// Code Blocks
// ----------------------------------------------------------------------------

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  color: var(--color-highlight);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-code-border);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
  background-color: var(--color-code-bg);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-code-border);
  overflow: hidden;
  margin-bottom: var(--space-md);
  color: var(--color-text);
  display: grid;
  grid-template-columns: auto 1fr;

  code {
    background: none;
    padding: 0 0 0 1em;
    border: none;
    font-size: inherit;
    color: inherit;
    grid-column: 2;
    overflow-x: auto;
    display: block;
  }

  .line-numbers {
    grid-column: 1;
    text-align: right;
    padding-right: 1em;
    border-right: 1px solid var(--color-code-border);
    color: var(--color-text-muted);
    user-select: none;
    white-space: pre;
    overflow: hidden;
  }
}

.code-block {
  margin-bottom: var(--space-md);

  &__filename {
    background-color: var(--color-code-border);
    color: var(--color-code-bg);
    padding: var(--space-xs) var(--space-md);
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border: 1px solid var(--color-code-border);
    border-bottom: none;
    text-align: center;
  }

  pre {
    margin-bottom: 0;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }

  &__filename + pre {
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }
}

// ----------------------------------------------------------------------------
// Blockquotes & Asides
// ----------------------------------------------------------------------------

blockquote {
  border-left: var(--border-accent-width) solid var(--color-primary);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.note {
  background-color: var(--color-code-bg);
  border-left: var(--border-accent-width) solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;

  &__title {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--space-sm);
  }

  &__content {
    color: var(--color-text);

    p:last-child {
      margin-bottom: 0;
    }
  }

  &--note {
    border-left-color: var(--color-primary);
    .note__title { color: var(--color-primary); }
  }

  &--info {
    border-left-color: var(--color-accent);
    .note__title { color: var(--color-accent); }
  }

  &--warning {
    border-left-color: var(--color-highlight);
    .note__title { color: var(--color-highlight); }
  }

  &--tip {
    border-left-color: var(--color-secondary);
    .note__title { color: var(--color-secondary); }
  }
}

// ----------------------------------------------------------------------------
// Lists
// ----------------------------------------------------------------------------

ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
  list-style-position: outside;
}

li {
  margin-bottom: var(--space-xs);
}

article .post-content,
.page-content,
.section-content {
  ul {
    list-style: none;
    padding-left: 0;
    margin-left: 0;

    li {
      position: relative;

      &::before {
        content: "✦";
        color: var(--color-secondary);
        font-weight: bold;
        position: absolute;
        left: -1.25em;
      }
    }
  }

  ol {
    list-style-position: outside;
    padding-left: 0;
    margin-left: 1.5em;

    li::marker {
      color: var(--color-secondary);
      font-weight: 600;
    }
  }

  h1, h2, h3, h4, h5, h6 {
    color: var(--color-primary);
  }

  a {
    text-decoration-style: wavy;
  }
}

// ----------------------------------------------------------------------------
// Layout
// ----------------------------------------------------------------------------

.container {
  max-width: var(--layout-content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--layout-padding);
  padding-right: var(--layout-padding);
}

main {
  min-height: 60vh;
  padding-bottom: var(--space-3xl);
}

// ----------------------------------------------------------------------------
// Header
// ----------------------------------------------------------------------------

.site-header {
  padding: var(--space-xl) 0;
  margin-bottom: var(--space-2xl);

  .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xl);
  }

  nav {
    margin-top: var(--space-md);

    ul {
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      gap: var(--space-lg);
    }

    a {
      color: var(--color-primary);
      font-weight: 500;
      text-transform: uppercase;
      transition: color var(--transition-base);

      &:hover {
        color: var(--color-secondary);
        text-decoration: none;
      }

      &[aria-current="page"] {
        color: var(--color-highlight);
        text-decoration: none;
      }
    }
  }
}

.header-bio {
  display: flex;
  align-items: center;
  gap: var(--space-md);

  &__photo img {
    width: var(--bio-photo-size);
    height: var(--bio-photo-size);
    border-radius: 50%;
    border: var(--bio-photo-border) solid var(--color-accent);
    object-fit: cover;
    display: block;
  }

  &__info {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  &__main {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  &__name {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--color-primary);
  }

  &__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-base);
    max-width: var(--bio-text-max-width);
  }

  &__socials {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);

    a {
      text-decoration: none;
      transition: all var(--transition-fast);
      color: var(--color-background);
      background-color: var(--color-primary);
      border-radius: var(--radius-md);
      padding: var(--space-xs);
      display: flex;
      align-items: center;
      justify-content: center;
      transform: rotateY(5deg) rotateX(10deg) rotateZ(5deg);
      box-shadow: 2px 4px 0px color-mix(in srgb, var(--color-border) 50%, transparent);

      &:hover {
        background-color: var(--color-highlight);
        transform: rotateY(0deg) rotateX(0deg) rotateZ(0deg) scale(1.1);
      }

      svg {
        display: block;
        width: var(--icon-size);
        height: var(--icon-size);
      }
    }
  }
}

// ----------------------------------------------------------------------------
// Page Title
// ----------------------------------------------------------------------------

.page-title {
  font-family: var(--font-display);
  font-size: clamp(var(--font-size-4xl), 8vw, var(--font-size-5xl));
  font-weight: 400;
  color: var(--color-primary);
  margin: 0 0 var(--space-2xl) 0;
  line-height: 1.2;
}

// ----------------------------------------------------------------------------
// Articles
// ----------------------------------------------------------------------------

article header {
  margin-bottom: var(--space-2xl);

  .post-title {
    margin-bottom: var(--space-sm);
    margin-top: 0;
  }

  .post-meta,
  .post-meta__tags {
    color: var(--color-highlight);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    font-weight: 500;
    font-style: italic;
    letter-spacing: -0.02em;
  }

  .post-meta {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    flex-wrap: wrap;
  }

  .post-meta__tags {
    @extend %tag-list;
  }

  .post-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    font-style: italic;
  }
}

.series-info {
  background-color: var(--color-code-bg);
  border-left: var(--border-accent-width) solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-2xl);

  &__header {
    margin-bottom: var(--space-md);
    font-size: var(--font-size-base);

    strong {
      color: var(--color-accent);
    }

    a {
      color: var(--color-primary);
      font-weight: 600;
    }
  }

  &__nav ol {
    list-style-position: inside;
    padding-left: 0;
    margin: 0;

    li {
      margin-bottom: var(--space-xs);

      &.current {
        font-weight: 600;
        color: var(--color-primary);
      }

      a {
        color: var(--color-text);

        &:hover {
          color: var(--color-primary);
        }
      }

      &.current a {
        color: var(--color-primary);
        text-decoration: none;
        cursor: default;
      }
    }
  }
}

// ----------------------------------------------------------------------------
// Post List
// ----------------------------------------------------------------------------

// Shared bullet styling
%bullet-point {
  position: relative;

  &::before {
    content: "✦";
    color: var(--color-secondary);
    position: absolute;
    left: -1.5em;
    font-size: 0.7em;
    top: 0.35em;
  }
}

// Shared list link styling
%list-link {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);

  &:hover {
    color: var(--color-secondary);
  }
}

// Shared tag list styling
%tag-list {
  display: inline-flex;
  gap: 0;
  list-style: none;
  padding: 0;
  margin: 0;
  font-style: normal;

  li {
    display: inline;

    &:not(:last-child)::after {
      content: ",\00a0";
    }
  }

  a {
    color: inherit;
    text-decoration: none;

    &:hover {
      text-decoration: underline;
    }
  }
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;

  &__item {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
  }

  &__title {
    @extend %bullet-point;
    margin: 0 0 var(--space-sm) 0;
    font-size: var(--font-size-2-5xl);
    line-height: var(--line-height-tight);
    font-weight: 600;

    a {
      @extend %list-link;
    }
  }

  &__series {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: var(--space-xs) 0 var(--space-sm) 0;
    font-style: italic;

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

      &:hover {
        color: var(--color-secondary);
        text-decoration: underline;
      }
    }
  }

  &__meta {
    color: var(--color-highlight);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    font-weight: 500;
    font-style: italic;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    flex-wrap: wrap;
  }

  &__description {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
  }

  &__tags {
    @extend %tag-list;
  }
}

// ----------------------------------------------------------------------------
// Taxonomy List
// ----------------------------------------------------------------------------

.taxonomy-list {
  list-style: none;
  padding: 0;
  margin: 0;

  &__item {
    @extend %bullet-point;
    margin-bottom: var(--space-md);
    font-size: var(--font-size-xl);
    line-height: var(--line-height-tight);
    font-weight: 600;

    a {
      @extend %list-link;
    }
  }

  &__count {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    font-weight: 400;
    margin-left: var(--space-xs);
  }
}

// ----------------------------------------------------------------------------
// Images
// ----------------------------------------------------------------------------

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

figure {
  margin: var(--space-xl) auto;
  text-align: center;

  img, video {
    display: block;
    margin: 0 auto;
  }

  figcaption {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    font-style: italic;
  }
}

// ----------------------------------------------------------------------------
// Mermaid Diagrams
// ----------------------------------------------------------------------------

.mermaid {
  margin: var(--space-xl) 0;
  display: flex;
  justify-content: center;
}

// ----------------------------------------------------------------------------
// Syntax Highlighting
// ----------------------------------------------------------------------------

pre code {
  .z-comment { color: var(--color-syntax-comment); font-style: italic; }
  .z-keyword,
  .z-keyword-constant,
  .z-keyword-declaration,
  .z-keyword-namespace,
  .z-keyword-pseudo,
  .z-keyword-reserved,
  .z-storage { color: var(--color-syntax-keyword); font-weight: 600; }
  .z-keyword-type,
  .z-storage-type { color: var(--color-syntax-function); font-weight: 600; }
  .z-constant,
  .z-constant-builtin,
  .z-constant-language,
  .z-constant-numeric,
  .z-constant-other { color: var(--color-syntax-number); }
  .z-constant-language { font-weight: 600; }
  .z-constant-character { color: var(--color-syntax-string); }
  .z-constant-regexp,
  .z-string-regexp { color: var(--color-highlight); }
  .z-entity,
  .z-entity-name,
  .z-entity-name-function,
  .z-entity-other,
  .z-entity-other-inherited-class,
  .z-support,
  .z-support-function,
  .z-support-type { color: var(--color-syntax-function); }
  .z-entity-name,
  .z-variable-language { font-weight: 600; }
  .z-entity-name-class,
  .z-entity-name-type,
  .z-entity-other-attribute-name,
  .z-support-class { color: var(--color-secondary); }
  .z-entity-name-tag { color: var(--color-syntax-keyword); }
  .z-invalid { color: var(--color-background); background-color: var(--color-highlight); }
  .z-invalid-deprecated { color: var(--color-background); background-color: var(--color-text-muted); }
  .z-markup { color: var(--color-text); }
  .z-markup-bold { color: var(--color-syntax-number); font-weight: 700; }
  .z-markup-deleted { color: var(--color-highlight); }
  .z-markup-heading { color: var(--color-highlight); font-weight: 600; }
  .z-markup-inserted { color: var(--color-syntax-string); }
  .z-markup-italic { color: var(--color-syntax-keyword); font-style: italic; }
  .z-markup-list { color: var(--color-highlight); }
  .z-markup-quote { color: var(--color-syntax-number); }
  .z-markup-raw { color: var(--color-syntax-string); }
  .z-meta { color: var(--color-text); }
  .z-string { color: var(--color-syntax-string); }
  .z-string-escape { color: var(--color-syntax-keyword); }
  .z-support-constant { color: var(--color-syntax-number); }
  .z-variable,
  .z-variable-parameter { color: var(--color-text); }
}

// ----------------------------------------------------------------------------
// Utilities
// ----------------------------------------------------------------------------

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

// ----------------------------------------------------------------------------
// Pagination
// ----------------------------------------------------------------------------

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);

  &__button {
    padding: var(--space-sm) var(--space-lg);
    background-color: var(--color-primary);
    color: var(--color-background);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: background-color var(--transition-fast);

    &:hover {
      background-color: var(--color-secondary);
      color: var(--color-background);
    }
  }

  &__info {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
  }
}

// ----------------------------------------------------------------------------
// Responsive Design
// ----------------------------------------------------------------------------

@media (max-width: 40rem) {
  :root {
    --layout-padding: var(--space-sm);
  }

  .site-header nav ul {
    flex-direction: column;
    gap: var(--space-sm);
  }

  article .post-content {
    ul {
      padding-left: 1.5em;
    }

    ol {
      padding-left: 1.5em;
      margin-left: 0;
    }
  }
}