/*
 * Style guide — alexandermervar.com
 *
 * Palette (all pass WCAG AA at normal text sizes)
 *   --ink:       #1a1a1a   primary text       contrast vs white: 16.7:1
 *   --ink-muted: #595959   secondary text     contrast vs white:  7.0:1
 *   --rule:      #d0d0d0   borders & rules
 *   --paper:     #ffffff   page background
 *
 * Typefaces
 *   Body:    Georgia, serif   — warm, editorial, newspaper feel
 *   UI:      system-ui, sans-serif — nav, labels, meta
 *
 * Principles
 *   - Links are always underlined in body text. No exceptions.
 *   - No color for decoration. Color is only used to communicate.
 *   - Every interactive element has a visible :focus-visible style.
 *   - No rounded corners, no shadows, no gradients.
 */

/* -----------------------------------------------
   Custom properties
----------------------------------------------- */
:root {
  --ink:       #1a1a1a;
  --ink-muted: #595959;
  --rule:      #d0d0d0;
  --paper:     #ffffff;
  --font-body: Georgia, 'Times New Roman', serif;
  --font-ui:   system-ui, -apple-system, sans-serif;
}

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

/* -----------------------------------------------
   Skip link (accessibility — keyboard users)
----------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

/* -----------------------------------------------
   Base
----------------------------------------------- */
html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
}

/* -----------------------------------------------
   Focus styles — visible for all keyboard users
----------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* -----------------------------------------------
   Layout
----------------------------------------------- */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

/* -----------------------------------------------
   Masthead / Navigation
----------------------------------------------- */
.site-header {
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: 0.85rem 0;
  margin-bottom: 3rem;
}

nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
}

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

nav a:focus-visible {
  outline-offset: 4px;
}

/* -----------------------------------------------
   Typography
----------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-ui);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 2.5rem;
  margin-bottom: 0.6rem;
}

h1 {
  font-size: 1.9rem;
  margin-top: 0;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.6rem;
  margin-bottom: 1.5rem;
}

h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

p {
  margin: 0 0 1.25rem;
}

/* -----------------------------------------------
   Links — always underlined in body text
----------------------------------------------- */
a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* -----------------------------------------------
   Post list (blog + projects)
----------------------------------------------- */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.post-list li:first-child {
  border-top: 1px solid var(--rule);
}

.post-meta {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin: 0 0 0.2rem;
  letter-spacing: 0.01em;
}

.post-title {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}

.post-title a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-title a:hover {
  text-decoration-thickness: 2px;
}

.post-description {
  font-size: 0.95rem;
  color: var(--ink-muted);
  margin: 0;
  font-family: var(--font-body);
  line-height: 1.5;
}

/* -----------------------------------------------
   Tags
----------------------------------------------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.tag {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  background: transparent;
  color: var(--ink-muted);
  border: 1px solid var(--rule);
  padding: 0.1rem 0.45rem;
}

/* -----------------------------------------------
   Article body (individual blog posts)
----------------------------------------------- */
article .post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

article .post-header h1 {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0.5rem;
}

article img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
  border: 1px solid var(--rule);
}

article figcaption {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-top: -1rem;
  margin-bottom: 1.5rem;
}

/* Footnotes (generated by Astro's markdown renderer) */
.footnotes {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.footnotes ol {
  padding-left: 1.25rem;
}

/* -----------------------------------------------
   Footer
----------------------------------------------- */
footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 3px solid var(--ink);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--ink-muted);
}

footer a {
  color: var(--ink-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

footer a:hover {
  color: var(--ink);
}

/* -----------------------------------------------
   Responsive
----------------------------------------------- */
@media (max-width: 480px) {
  html { font-size: 16px; }
  h1   { font-size: 1.6rem; }
}