/* ==========================================================================
   Blog Shared Styles
   All blog posts and pages should link to this single stylesheet.
   DO NOT create page-specific CSS files.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables - Edit these to change the site's look
   -------------------------------------------------------------------------- */
:root {
  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Serif Pro', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-nav: 'DM Sans', 'Avenir', sans-serif;

  /* Colors - Cool teal aesthetic */
  --color-bg: #f5f9f8;
  --color-bg-alt: #e8f0ee;
  --color-text: #1e2a28;
  --color-text-muted: #5a6b68;
  --color-accent: #2a7d6e;
  --color-accent-hover: #1d5c50;
  --color-link: #1a6b7a;
  --color-link-hover: #0d4a54;
  --color-border: #c2d4d0;
  --color-code-bg: #2d2a26;
  --color-code-text: #e8e2d9;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width-content: 720px;
  --max-width-wide: 1100px;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

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

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  margin-top: var(--space-xl);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

h3 {
  font-size: 1.35rem;
  margin-top: var(--space-lg);
}

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

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

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

blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--space-lg);
  border-radius: 6px;
  overflow-x: auto;
  margin: var(--space-lg) 0;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.9rem;
}

ul, ol {
  margin: var(--space-md) 0 var(--space-md) var(--space-lg);
}

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

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.content {
  max-width: var(--max-width-content);
  margin: var(--space-lg) auto;
  padding: var(--space-xl);
  background: white;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

main {
  flex: 1;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

.main-nav {
  display: flex;
  gap: var(--space-xs);
}

.main-nav a {
  font-family: var(--font-nav);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* Mobile nav toggle (hidden by default) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: 0.3s;
}

/* --------------------------------------------------------------------------
   Article / Post Styles
   -------------------------------------------------------------------------- */
.post-header {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.post-header h1 {
  margin-bottom: var(--space-sm);
}

.post-meta {
  font-family: var(--font-nav);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.post-meta time {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.post-category {
  background: var(--color-accent);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 3px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
}

.post-category:hover {
  background: var(--color-accent-hover);
  color: white;
}

.post-content {
  font-size: 1.05rem;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: var(--space-lg) 0;
}

/* --------------------------------------------------------------------------
   Post Listing / Index
   -------------------------------------------------------------------------- */
.posts-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-preview {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.post-preview h2 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-sm) 0;
  padding: 0;
  border: none;
}

.post-preview h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-preview h2 a:hover {
  color: var(--color-accent);
}

.post-preview .post-meta {
  justify-content: flex-start;
  margin-bottom: var(--space-sm);
}

.post-excerpt {
  color: var(--color-text-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Category Pages
   -------------------------------------------------------------------------- */
.category-header {
  text-align: center;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.category-header h1 {
  margin-bottom: var(--space-sm);
}

.category-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-nav);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  h1 {
    font-size: 2rem;
  }

  .site-header .container {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: var(--space-md);
    gap: 0;
  }

  .main-nav.active {
    display: flex;
  }

  .main-nav a {
    padding: var(--space-sm) 0;
    border-radius: 0;
  }

  .site-footer .container {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}