/* theme.css -- SuperScript
 * Single-file CSS theme for Zola static site
 */

/* ===========================================
   1. Font Imports
   =========================================== */
@import url('https://fonts.googleapis.com/css2?family=Fira+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Fira+Sans+Condensed:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Fira+Sans+Extra+Condensed:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Fira+Mono:wght@400;500&display=swap');

/* ===========================================
   2. Custom Properties
   =========================================== */
:root {
  color-scheme: light dark;

  /* Brand */
  --color-brand:         #a22638;
  --color-brand-dark:    #7d1e2c;
  --color-brand-light:   #f9e8eb;

  /* Neutrals */
  --color-bg:            #ffffff;
  --color-bg-subtle:     #f7f8fa;
  --color-bg-muted:      #eef0f3;
  --color-text:          #1a1a2e;
  --color-text-secondary:#4a5568;
  --color-text-tertiary: #718096;
  --color-border:        #e2e8f0;
  --color-border-light:  #edf2f7;

  /* Semantic */
  --color-link:          #a22638;
  --color-link-hover:    #7d1e2c;
  --color-link-visited:  #8b2030;
  --color-code-bg:       #f5f7fa;
  --color-code-border:   #e2e8f0;
  --color-blockquote-border: #a22638;
  --color-blockquote-bg: #fefcfc;
  --color-focus:         rgba(162, 38, 56, 0.4);

  /* Typography */
  --font-body:    'Fira Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-heading: 'Fira Sans Condensed', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-nav:     'Fira Sans Extra Condensed', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'Fira Mono', 'SF Mono', ui-monospace, monospace;

  /* Size scale */
  --text-xs:     0.875rem;
  --text-sm:     1rem;
  --text-base:   1.125rem;
  --text-lg:     1.1875rem;
  --text-xl:     1.25rem;
  --text-2xl:    2rem;

  /* Weights */
  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  /* Line heights */
  --leading-tight:   1.25;
  --leading-snug:    1.375;
  --leading-normal:  1.6;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.5rem;
  --space-6:   2rem;
  --space-8:   3rem;
  --space-10:  4rem;
  --space-12:  5rem;

  /* Layout */
  --width-content: 42rem;
  --width-header:  64rem;
  --gutter:        var(--space-5);

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-full: 9999px;
}

/* ===========================================
   2b. Dark Mode Overrides
   =========================================== */

/* Dark mode toggle widget */
#theme-toggle {
  position: absolute;
  width: 0;
  height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  opacity: 0;
}
#theme label {
  display: inline-grid;
  cursor: pointer;
}
#theme label > * {
  grid-area: 1 / 1;
}

/* Icon visibility: light-system default shows moon, dark-system default shows sun.
   Uses visibility so both icons remain in the grid and the cell size stays stable. */
#theme .theme-icon-dark { visibility: hidden; }

@media (prefers-color-scheme: dark) {
  #theme .theme-icon-light { visibility: hidden; }
  #theme .theme-icon-dark  { visibility: visible; }
}

/* Checkbox toggles icons away from system default */
html:has(#theme-toggle:checked) #theme .theme-icon-light { visibility: hidden; }
html:has(#theme-toggle:checked) #theme .theme-icon-dark  { visibility: visible; }
@media (prefers-color-scheme: dark) {
  html:has(#theme-toggle:checked) #theme .theme-icon-light { visibility: visible; }
  html:has(#theme-toggle:checked) #theme .theme-icon-dark  { visibility: hidden; }
}

/* Light-system user toggles to dark */
@media (prefers-color-scheme: light) {
  html:has(#theme-toggle:checked) {
    color-scheme: dark;

    --color-brand:         #d4475c;
    --color-brand-dark:    #e05a6e;
    --color-brand-light:   #3a1520;

    --color-bg:            #1a1a2e;
    --color-bg-subtle:     #22223a;
    --color-bg-muted:      #2a2a42;
    --color-text:          #e2e8f0;
    --color-text-secondary:#a0aec0;
    --color-text-tertiary: #718096;
    --color-border:        #2d3748;
    --color-border-light:  #252540;

    --color-link:          #d4475c;
    --color-link-hover:    #e05a6e;
    --color-link-visited:  #c44358;
    --color-code-bg:       #22223a;
    --color-code-border:   #2d3748;
    --color-blockquote-border: #d4475c;
    --color-blockquote-bg: #22223a;
    --color-focus:         rgba(212, 71, 92, 0.4);
  }
  html:has(#theme-toggle:checked) pre.giallo { color-scheme: dark !important; }
}

/* Dark-system user, hasn't toggled away */
@media (prefers-color-scheme: dark) {
  html:not(:has(#theme-toggle:checked)) {
    color-scheme: dark;

    --color-brand:         #d4475c;
    --color-brand-dark:    #e05a6e;
    --color-brand-light:   #3a1520;

    --color-bg:            #1a1a2e;
    --color-bg-subtle:     #22223a;
    --color-bg-muted:      #2a2a42;
    --color-text:          #e2e8f0;
    --color-text-secondary:#a0aec0;
    --color-text-tertiary: #718096;
    --color-border:        #2d3748;
    --color-border-light:  #252540;

    --color-link:          #d4475c;
    --color-link-hover:    #e05a6e;
    --color-link-visited:  #c44358;
    --color-code-bg:       #22223a;
    --color-code-border:   #2d3748;
    --color-blockquote-border: #d4475c;
    --color-blockquote-bg: #22223a;
    --color-focus:         rgba(212, 71, 92, 0.4);
  }
  html:not(:has(#theme-toggle:checked)) pre.giallo { color-scheme: dark !important; }
}

/* Smooth theme transition */
body, h1, h2, h3, h4, h5, a, .highlight span {
  transition:
    color 200ms ease-in-out,
    background-color 200ms ease-in-out;
}

/* ===========================================
   3. Reset / Base
   =========================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 clamp(var(--space-4), 3vw, var(--space-8));
  max-width: var(--width-header);
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ===========================================
   4. Layout
   =========================================== */
main {
  max-width: var(--width-content);
  padding: var(--space-4) 0 var(--space-8);
  min-height: 60vh;
}

/* ===========================================
   5. Header
   =========================================== */
header {
  padding-top: var(--space-8);
  padding-bottom: var(--space-4);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-brand a {
  text-decoration: none;
  border: none;
  line-height: 0;
}

header img {
  height: 2em;
  width: auto;
  display: block;
}

header h1 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--color-text);
}


/* ===========================================
   6. Navigation
   =========================================== */
.nav-toggle {
  display: none;
}

/* Hamburger visible by default, inline nav hidden */
.header-bar {
  flex-wrap: wrap;
}

.nav-burger {
  display: block;
  cursor: pointer;
  width: 1.5rem;
  height: 1.25rem;
  position: relative;
}

.nav-burger span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-brand);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-burger span:nth-child(1) { top: 0; }
.nav-burger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-burger span:nth-child(3) { bottom: 0; }

.nav-toggle:checked ~ .nav-burger span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle:checked ~ .nav-burger span:nth-child(2) {
  opacity: 0;
}

.nav-toggle:checked ~ .nav-burger span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

header nav {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  width: 100%;
  gap: 0;
  font-size: 0;
}

.nav-toggle:checked ~ nav {
  display: flex;
}

header nav a,
header nav a:visited {
  font-family: var(--font-nav);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  text-decoration: none;
  color: var(--color-brand);
  transition: color 0.15s ease, border-color 0.15s ease;
  padding: var(--space-3) 0;
  letter-spacing: 0.01em;
  border-bottom: none;
}

header nav a[aria-current="page"],
header nav a[aria-current="page"]:visited {
  color: var(--color-text);
  font-weight: var(--weight-bold);
}

/* Wide: inline nav, no hamburger */
@media (min-width: 960px) {
  .header-bar {
    flex-wrap: nowrap;
  }

  .nav-burger {
    display: none;
  }

  header nav {
    display: flex;
    flex-direction: row;
    align-items: center;
    width: auto;
    gap: var(--space-5);
    text-align: left;
  }

  header nav a {
    font-size: var(--text-sm);
    padding: var(--space-2) 0;
    border-bottom: 2px solid transparent;
  }

  header nav a:hover {
    color: var(--color-text);
    border-bottom-color: var(--color-border);
  }

  header nav a[aria-current="page"] {
    color: var(--color-text);
    font-weight: var(--weight-bold);
    border-bottom-color: var(--color-brand);
  }

}

/* ===========================================
   7. Content Typography
   =========================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  line-height: var(--leading-snug);
  margin: var(--space-10) 0 var(--space-4);
}

h2 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.01em;
  margin: var(--space-6) 0 var(--space-3);
}

h3 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  margin: var(--space-5) 0 var(--space-3);
}

h4, h5, h6 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  margin: var(--space-4) 0 var(--space-2);
}

p {
  margin: 0 0 var(--space-4);
}

ul, ol {
  margin: var(--space-2) 0 var(--space-4);
  padding-left: 2.5rem;
  list-style: none;
}

li {
  position: relative;
  margin-bottom: var(--space-2);
}

ul > li::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.6em;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--color-brand);
}

header ul > li::before,
footer > ul > li::before,
nav ul > li::before,
.gallery li::before {
  content: none;
}

ol {
  counter-reset: ol-counter;
}

ol > li {
  counter-increment: ol-counter;
}

ol > li::before {
  content: counter(ol-counter) ".";
  position: absolute;
  left: -2rem;
  width: 1.5rem;
  text-align: right;
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

strong {
  font-weight: var(--weight-semibold);
  color: var(--color-text);
}

em {
  font-style: italic;
}


/* ===========================================
   9. Dividers
   =========================================== */
.divider {
  margin: var(--space-8) 0;
  border: none;
  height: 1px;
  background: var(--color-border);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* ===========================================
   9. Article Pages
   =========================================== */
.page-title h1 {
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}

.page-title h1 br {
  content: "";
  display: block;
  margin-top: var(--space-3);
}

article h1 small {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
}

article > p:has(time) {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
}

article > p:has(time) a {
  color: var(--color-text-tertiary);
  text-decoration: none;
}

article > p:has(time) a:visited {
  color: var(--color-text-tertiary);
}

article > p:has(time) a:hover {
  color: var(--color-brand);
}

/* Prev/next navigation */
footer > div {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
}

footer > div a {
  color: var(--color-brand);
  text-decoration: none;
}

footer > div a:hover {
  text-decoration: underline;
}

/* ===========================================
   10. Blog Listing
   =========================================== */
.blog-entry {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.blog-entry:not(:has(~ .blog-entry)) {
  border-bottom: none;
}

.blog-entry h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin: 0 0 var(--space-2);
}

.blog-entry h3 a {
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.15s ease;
}

.blog-entry h3 a:hover {
  color: var(--color-brand);
}

.blog-entry > p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin: 0;
  line-height: var(--leading-normal);
}

/* Pagination */
main > nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

main > nav a {
  color: var(--color-brand);
  text-decoration: none;
  font-weight: var(--weight-medium);
}

main > nav a:hover {
  text-decoration: underline;
}

/* ===========================================
   11. Archive & Taxonomy
   =========================================== */
main > h2 {
  color: var(--color-text-secondary);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-light);
}

main > ul:has(> li > span) {
  list-style: none;
  padding: 0;
}

main > ul:has(> li > span) > li {
  padding: var(--space-2) 0;
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
}

main > ul:has(> li > span) > li::before {
  content: none;
}

main > ul:has(> li > span) > li > span {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  min-width: 4em;
}

main > ul:has(> li > span) > li a {
  color: var(--color-text);
  text-decoration: none;
}

main > ul:has(> li > span) > li a:hover {
  color: var(--color-brand);
}

/* ===========================================
   12. Tables
   =========================================== */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  margin: var(--space-6) 0;
  display: block;
  overflow-x: auto;
}

thead {
  border-bottom: 2px solid var(--color-border);
}

th {
  text-align: left;
  font-weight: var(--weight-semibold);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  background: none;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: top;
}

tr:last-child td {
  border-bottom: none;
}

/* ===========================================
   13. Blockquotes & Epigraphs
   =========================================== */
blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--color-blockquote-border);
  background: var(--color-blockquote-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

blockquote p {
  margin: 0 0 var(--space-2);
}

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

blockquote footer {
  font-style: normal;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-3);
  padding: 0;
  border: none;
}

blockquote cite {
  font-style: italic;
}

/* ===========================================
   14. Code Blocks
   =========================================== */
pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  margin: var(--space-5) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

:not(pre) > code {
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
  border: 1px solid var(--color-code-border);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  border-radius: 0;
}

/* ===========================================
   15. Figures & Gallery
   =========================================== */
figure {
  margin: var(--space-6) 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

figcaption {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
  font-style: italic;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.gallery figure {
  margin: 0;
}

.gallery figure img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-md);
  transition: transform 0.2s ease;
}

.gallery figure img:hover {
  transform: scale(1.02);
}

/* ===========================================
   16. Shortcode Elements
   =========================================== */
.newthought {
  font-variant: small-caps;
  font-size: 1.1em;
  letter-spacing: 0.02em;
}

.marginnote::before { content: " ("; }
.marginnote::after { content: ")"; }

@media (min-width: 960px) {
  .marginnote {
    position: absolute;
    right: calc(-15rem - var(--space-5));
    width: 15rem;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-normal);
  }

  .marginnote::before,
  .marginnote::after { content: none; }

  article p,
  article li {
    position: relative;
  }
}

article small {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* ===========================================
   17. Footer
   =========================================== */
footer {
  font-family: var(--font-nav);
  padding: var(--space-6) 0 var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

footer > .divider {
  margin-bottom: var(--space-6);
}

.footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bar > p {
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  margin: 0;
}

.footer-bar > ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: var(--space-4);
  margin: 0;
}

.footer-bar > ul li::before {
  content: none;
}

.footer-bar > ul a,
.footer-bar > ul button {
  color: var(--color-text-tertiary);
  font-size: var(--text-lg);
  transition: color 0.15s ease;
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.footer-bar > ul a:hover,
.footer-bar > ul button:hover {
  color: var(--color-brand);
}

.footer-bar > ul a.feed-atom {
  color: var(--color-text);
}

.footer-bar > ul a.feed-atom:hover {
  color: var(--color-brand);
}

/* ===========================================
   18. Links & Focus
   =========================================== */
a {
  color: var(--color-link);
  text-decoration-color: var(--color-brand-light);
  text-underline-offset: 0.15em;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration-color: var(--color-link-hover);
}

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ===========================================
   19. KaTeX Overrides
   =========================================== */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--space-2) 0;
}

.katex {
  font-size: 1.1em;
}

/* ===========================================
   20. Responsive
   =========================================== */
@media (min-width: 560px) {
  .gallery {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

/* ===========================================
   21. Print
   =========================================== */
@media print {
  header {
    position: static;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .divider {
    border-top: 1px solid #ccc;
  }

  footer > ul,
  header nav {
    display: none;
  }
}