/* ============================================================
   Grumpy Old Cyber Guys — Stylesheet
   Dark terminal-inspired theme
   ============================================================ */

/* --- Custom properties --- */
:root {
  --color-bg:           #0d1117;
  --color-bg-surface:   #161b22;
  --color-bg-elevated:  #21262d;
  --color-border:       #30363d;
  --color-text:         #c9d1d9;
  --color-text-muted:   #8b949e;
  --color-text-heading: #e6edf3;
  --color-accent:       #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-green:        #3fb950;
  --color-red:          #f85149;
  --color-yellow:       #d29922;
  --color-tag-bg:       #1f3148;
  --color-tag-text:     #58a6ff;
  --color-code-bg:      #161b22;
  --color-code-text:    #79c0ff;

  --font-sans:  'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:  'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;

  --size-content: 72ch;
  --size-wide:    90ch;

  --radius:  4px;
  --radius-lg: 8px;

  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   2rem;
  --space-xl:   4rem;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* --- Base --- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* --- Links --- */
a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color 0.15s, text-decoration-color 0.15s;
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-heading);
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }

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

strong { color: var(--color-text-heading); font-weight: 600; }
em { font-style: italic; }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--size-wide);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.site-main {
  flex: 1;
  padding-block: var(--space-xl);
}

/* --- Header --- */
.site-header {
  background-color: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-md);
  flex-wrap: wrap;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.05em;
  color: var(--color-text-heading);
}

.site-logo__bracket { color: var(--color-green); }
.site-logo__text    { color: var(--color-accent); }

.site-logo:hover .site-logo__text { color: var(--color-accent-hover); }

/* --- Nav --- */
.site-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.site-nav__link {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.15s, background-color 0.15s;
}

.site-nav__link:hover,
.site-nav__link--active {
  color: var(--color-text-heading);
  background-color: var(--color-bg-elevated);
}

.site-nav__link--rss {
  color: var(--color-yellow);
  border: 1px solid var(--color-border);
}

.site-nav__link--rss:hover {
  color: var(--color-text-heading);
  background-color: var(--color-bg-elevated);
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-lg);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-footer__copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.site-footer__nav {
  display: flex;
  gap: var(--space-md);
  font-size: 0.85rem;
}

/* --- Hero / Home --- */
.hero {
  padding-block: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-green);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  color: var(--color-text-heading);
  margin-top: 0;
  margin-bottom: var(--space-md);
  line-height: 1.1;
}

.hero__title span { color: var(--color-accent); }

.hero__lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-bottom: 0;
}

/* --- Post list --- */
.post-list {
  list-style: none;
}

.post-list__item {
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-lg);
}

.post-list__item:last-child { border-bottom: none; }

.post-list__date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: var(--space-xs);
}

.post-list__title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.post-list__title a {
  color: var(--color-text-heading);
  text-decoration: none;
}

.post-list__title a:hover { color: var(--color-accent-hover); }

.post-list__excerpt {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}

/* --- Tags --- */
.post__tags,
.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: 0;
}

.tag {
  display: inline-block;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid rgba(88, 166, 255, 0.2);
  transition: background-color 0.15s, border-color 0.15s;
}

.tag:hover {
  background-color: rgba(88, 166, 255, 0.15);
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

/* --- Post article --- */
.post__header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.post__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.post__date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.post__title { margin-top: 0; }

.post__lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-top: var(--space-md);
  margin-bottom: 0;
  max-width: 60ch;
}

.post__footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* --- Prose (post body) --- */
.prose {
  max-width: var(--size-content);
}

.prose h2,
.prose h3,
.prose h4 {
  scroll-margin-top: 5rem;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
  margin-bottom: var(--space-md);
}

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

.prose blockquote {
  border-left: 3px solid var(--color-accent);
  margin: var(--space-lg) 0;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-bg-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: var(--space-lg);
}

.prose img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: 0.9rem;
}

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

.prose th {
  background-color: var(--color-bg-elevated);
  color: var(--color-text-heading);
  font-weight: 600;
}

.prose tr:nth-child(even) td { background-color: var(--color-bg-surface); }

/* --- Code --- */
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--color-code-text);
  background-color: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

pre {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--color-text);
}

/* --- Back link --- */
.back-link {
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--color-text-muted);
}

.back-link:hover { color: var(--color-accent); }

/* --- Section headings --- */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.section-header h2 { margin: 0; font-size: 1.5rem; }
.section-header a   { font-size: 0.9rem; }

/* --- Page header --- */
.page-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 { margin-top: 0; }

.page-header p {
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-bottom: 0;
}

/* --- Utility --- */
.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;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .site-header__inner { gap: var(--space-sm); }
  .hero__title        { font-size: 2rem; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; }
}

/* --- About photo --- */
.about-photo {
  margin: 0 0 var(--space-lg);
}

.about-photo__img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}