/* ==========================================================================
   artiombn's blog — base stylesheet
   --------------------------------------------------------------------------
   A minimal, readable starting point. Nearly everything you'll want to tweak
   lives in the "design tokens" block below. Component styles come after.

   References:
     - Modern CSS reset ........ https://piccalil.li/blog/a-more-modern-css-reset/
     - Fluid type/space scales . https://utopia.fyi/
     - Modern Font Stacks ...... https://modernfontstacks.com/
     - WCAG 2.2 contrast ....... https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root {
  color-scheme: light dark;

  /* Typography ---------------------------------------------------------- */
  /* Merriweather is a large-x-height screen serif; falls back gracefully. */
  --font-body: "Merriweather", Georgia, Cambria, "Times New Roman", serif;
  --font-heading: "Merriweather", Georgia, Cambria, serif;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* Fluid type scale — roughly a 1.2–1.25 ratio, clamped to the viewport. */
  --step--1: clamp(0.77rem, 0.74rem + 0.14vw, 0.87rem);
  --step-0: clamp(0.88rem, 0.84rem + 0.23vw, 0.99rem); /* body copy */
  --step-nav: clamp(0.98rem, 0.93rem + 0.28vw, 1.12rem); /* navbar */
  --step-1: clamp(1.07rem, 0.98rem + 0.47vw, 1.28rem);
  --step-2: clamp(1.30rem, 1.13rem + 0.84vw, 1.63rem);
  --step-3: clamp(1.58rem, 1.32rem + 1.30vw, 2.09rem);
  --step-4: clamp(1.86rem, 1.49rem + 1.86vw, 2.60rem); /* h1 */

  /* Spacing scale ------------------------------------------------------- */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout -------------------------------------------------------------- */
  /* ~40rem with the body font lands around 65–72 characters per line. */
  --content-width: 46rem;
  --gutter: clamp(1rem, 4vw, 2rem);
  --radius: 0.375rem;

  /* Colors — light mode ------------------------------------------------ */
  --color-bg: #fcfcfa;
  --color-surface: #f2f2ef;
  --color-text: #1b1b1b;
  --color-muted: #5a5a5a;
  --color-border: #dcdcd6;
  --color-accent: #14508f;
  --color-accent-hover: #0e3a68;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #16161a;
    --color-surface: #212127;
    --color-text: #e8e6e1;
    --color-muted: #a6a49f;
    --color-border: #34343c;
    --color-accent: #8ab4f8;
    --color-accent-hover: #b0c9fb;
  }
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6,
li,
dd {
  overflow-wrap: break-word;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   3. Layout
   -------------------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.site-nav {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding: var(--space-sm) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-md);
  font-family: var(--font-ui);
  font-size: var(--step-nav);
}

.site-nav a {
  color: var(--color-text);
  text-decoration-color: transparent;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}

.site-nav > div {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.content {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding: var(--space-2xl) var(--gutter) var(--space-3xl);
  flex: 1;
}

/* --------------------------------------------------------------------------
   4. Typography
   -------------------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  font-size: var(--step-4);
  margin-block: 0 var(--space-md);
}
h2 {
  font-size: var(--step-2);
  margin-block: var(--space-2xl) var(--space-sm);
}
h3 {
  font-size: var(--step-1);
  margin-block: var(--space-xl) var(--space-xs);
}
h4 {
  font-size: var(--step-0);
  margin-block: var(--space-lg) var(--space-xs);
}
h5,
h6 {
  font-size: var(--step--1);
  margin-block: var(--space-lg) var(--space-2xs);
}

/* Don't add space above a heading that opens the page. */
:is(h1, h2, h3, h4, h5, h6):first-child {
  margin-block-start: 0;
}

p {
  margin-block: 0 var(--space-md);
  text-wrap: pretty;
}

a {
  color: var(--color-accent);
  text-decoration-line: underline;
  text-decoration-thickness: max(1px, 0.06em);
  text-underline-offset: 0.15em;
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
  transition: color 120ms ease, text-decoration-color 120ms ease;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

strong {
  font-weight: 700;
}

small {
  font-size: var(--step--1);
  color: var(--color-muted);
}

::selection {
  background-color: color-mix(in srgb, var(--color-accent) 25%, transparent);
}

/* --------------------------------------------------------------------------
   5. Lists, quotes, rules
   -------------------------------------------------------------------------- */
ul,
ol {
  margin-block: 0 var(--space-md);
  padding-inline-start: 1.5em;
}

li {
  margin-block: var(--space-2xs);
  text-wrap: pretty;
}

li > ul,
li > ol {
  margin-block: var(--space-2xs);
}

blockquote {
  margin-block: var(--space-lg);
  padding-inline-start: var(--space-md);
  border-inline-start: 3px solid var(--color-border);
  color: var(--color-muted);
  font-style: italic;
}

blockquote p:last-child {
  margin-block-end: 0;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin-block: var(--space-2xl);
}

/* --------------------------------------------------------------------------
   6. Code
   -------------------------------------------------------------------------- */
code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  background-color: var(--color-surface);
  padding: 0.15em 0.35em;
  border-radius: var(--radius);
}

pre {
  margin-block: 0 var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  padding: 0;
  background: none;
  font-size: 1em;
}

/* --------------------------------------------------------------------------
   7. Media, tables
   -------------------------------------------------------------------------- */
figure {
  margin-block: var(--space-xl);
  text-align: center;
}

figure img {
  margin-inline: auto;
  border-radius: var(--radius);
}

figcaption {
  margin-block-start: var(--space-xs);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  color: var(--color-muted);
}

table {
  width: 100%;
  margin-block: 0 var(--space-md);
  border-collapse: collapse;
  font-size: var(--step--1);
}

th,
td {
  padding: var(--space-xs) var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

thead th {
  border-bottom-width: 2px;
}

/* --------------------------------------------------------------------------
   8. Site components
   -------------------------------------------------------------------------- */
/* Post listings rendered by index.html / section.html / sitemap.html */
.post-list {
  list-style: none;
  padding-inline-start: 0;
}

.post-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-sm);
  margin-block: var(--space-xs);
}

.timestamp {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--color-muted);
}