/* ============================================
   CONFIGURATION SECTION
   Modify these variables to customize the site
   ============================================ */

:root {
  /* === TYPOGRAPHY CONFIGURATION === */
  /* Change these to use different font families */
  --font-serif: 'EB Garamond', 'Garamond', 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Menlo', 'Monaco', 'Courier New', monospace;

  /* Base font size - all text scales relative to this */
  --font-size-base: 20px;

  /* Font size scale (relative to base) */
  --font-scale-ratio: 1.25;

  /* Line height for readability */
  --line-height-base: 1.8;
  --line-height-heading: 1.4;

  /* === LAYOUT CONFIGURATION === */
  --max-width: 720px;
  --spacing-base: 1.5rem;

  /* === LIGHT MODE COLORS (The Browser Company inspired) === */
  --light-bg-primary: #EEEEE7;
  --light-bg-secondary: #E0E0D8;
  --light-text-primary: #1a1a1a;
  --light-text-secondary: #4a4a4a;
  --light-text-muted: #7a7a7a;
  --light-border: #d0d0c8;
  --light-link: #0066cc;
  --light-link-hover: #0052a3;

  /* === DARK MODE COLORS (Kindle dark mode) === */
  --dark-bg-primary: #1e1e1e;
  --dark-bg-secondary: #2d2d2d;
  --dark-text-primary: #cccccc;
  --dark-text-secondary: #999999;
  --dark-text-muted: #777777;
  --dark-border: #3d3d3d;
  --dark-link: #8ba8c4;
  --dark-link-hover: #a3bdd4;

  /* === NIGHT MODE COLORS (warm red tones) === */
  --night-bg-primary: #1a0f0f;
  --night-bg-secondary: #2a1818;
  --night-text-primary: #f5d5d5;
  --night-text-secondary: #d5a5a5;
  --night-text-muted: #b58585;
  --night-border: #3a2020;
  --night-link: #ff9999;
  --night-link-hover: #ffbbbb;

  /* Active theme (default: light) */
  --bg-primary: var(--light-bg-primary);
  --bg-secondary: var(--light-bg-secondary);
  --text-primary: var(--light-text-primary);
  --text-secondary: var(--light-text-secondary);
  --text-muted: var(--light-text-muted);
  --border-color: var(--light-border);
  --link-color: var(--light-link);
  --link-hover: var(--light-link-hover);
}

/* Theme variations - Apply to :root for simplicity */
:root[data-theme="light"] {
  --bg-primary: var(--light-bg-primary);
  --bg-secondary: var(--light-bg-secondary);
  --text-primary: var(--light-text-primary);
  --text-secondary: var(--light-text-secondary);
  --text-muted: var(--light-text-muted);
  --border-color: var(--light-border);
  --link-color: var(--light-link);
  --link-hover: var(--light-link-hover);
}

:root[data-theme="dark"] {
  --bg-primary: var(--dark-bg-primary);
  --bg-secondary: var(--dark-bg-secondary);
  --text-primary: var(--dark-text-primary);
  --text-secondary: var(--dark-text-secondary);
  --text-muted: var(--dark-text-muted);
  --border-color: var(--dark-border);
  --link-color: var(--dark-link);
  --link-hover: var(--dark-link-hover);
}

:root[data-theme="night"] {
  --bg-primary: var(--night-bg-primary);
  --bg-secondary: var(--night-bg-secondary);
  --text-primary: var(--night-text-primary);
  --text-secondary: var(--night-text-secondary);
  --text-muted: var(--night-text-muted);
  --border-color: var(--night-border);
  --link-color: var(--night-link);
  --link-hover: var(--night-link-hover);
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
}

body {
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  padding: clamp(1rem, 4vw, 2rem);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ============================================
   TYPOGRAPHY
   Headings use sans-serif, body uses serif
   All sizes scale relative to base font size
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-top: calc(var(--spacing-base) * 1.333);
  margin-bottom: calc(var(--spacing-base) * 0.667);
  color: var(--text-primary);
}

h1 {
  font-size: calc(var(--font-size-base) * var(--font-scale-ratio) * var(--font-scale-ratio) * var(--font-scale-ratio));
  margin-top: 0;
}

h2 {
  font-size: calc(var(--font-size-base) * var(--font-scale-ratio) * var(--font-scale-ratio));
  margin-top: calc(var(--spacing-base) * 2);
  margin-bottom: calc(var(--spacing-base) * 0.75);
}

h3 {
  font-size: calc(var(--font-size-base) * var(--font-scale-ratio));
}

h4 {
  font-size: calc(var(--font-size-base) * 1.1);
}

h5, h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-base);
}

/* Links */
a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  margin-bottom: calc(var(--spacing-base) * 2);
  padding-bottom: var(--spacing-base);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  position: absolute;
  top: 0;
  right: 0;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.site-title {
  font-family: var(--font-sans);
  font-size: calc(var(--font-size-base) * var(--font-scale-ratio));
  font-weight: 700;
  margin-bottom: var(--spacing-base);
}

.site-title a {
  color: var(--text-primary);
  border: none;
}

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

nav {
  display: flex;
  gap: var(--spacing-base);
  align-items: center;
  flex-wrap: wrap;
}

nav a {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-secondary);
  border: none;
}

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

/* ============================================
   THEME SWITCHER
   ============================================ */

.theme-switcher {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.theme-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.theme-btn:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--link-color);
}

.theme-btn.active {
  background: var(--link-color);
  color: white;
  border-color: var(--link-color);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

main {
  margin-bottom: calc(var(--spacing-base) * 2);
}

/* Article/Post Styles */
article {
  margin-bottom: calc(var(--spacing-base) * 2);
}

/* Homepage intro - make first paragraph larger */
main > p:first-of-type {
  font-family: var(--font-sans);
  font-size: calc(var(--font-size-base) * 1.25);
  font-weight: 600;
  margin-bottom: calc(var(--spacing-base) * 1.5);
}

article h1 {
  font-size: calc(var(--font-size-base) * 1.5);
  margin-bottom: calc(var(--spacing-base) * 1.5);
  font-weight: 600;
}

article p {
  margin-bottom: calc(var(--spacing-base) * 1.25);
  line-height: var(--line-height-base);
}

article h2 {
  margin-top: calc(var(--spacing-base) * 2.5);
  margin-bottom: var(--spacing-base);
}

article h3 {
  margin-top: calc(var(--spacing-base) * 2);
  margin-bottom: calc(var(--spacing-base) * 0.75);
}

.post-meta {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-base);
}

.post-title {
  margin-bottom: 0;
}

.post-title a {
  color: var(--text-primary);
  border: none;
  font-size: calc(var(--font-size-base) * 1.15);
  font-weight: 500;
  line-height: 1.5;
}

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

.post-list p {
  margin-top: 0.5rem;
  margin-bottom: 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

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

.post-list li {
  margin-bottom: 2rem;
  padding-bottom: 0;
  border-bottom: none;
}

.post-list li:last-child {
  margin-bottom: 0;
}

/* Lists in content */
ul, ol {
  margin-left: 1.5rem;
  margin-bottom: var(--spacing-base);
}

li {
  margin-bottom: 0.5rem;
}

/* ============================================
   CODE BLOCKS
   ============================================ */

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

pre {
  background: var(--bg-secondary);
  padding: var(--spacing-base);
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: var(--spacing-base);
}

pre code {
  background: none;
  padding: 0;
}

/* ============================================
   BLOCKQUOTES
   ============================================ */

blockquote {
  border-left: 4px solid var(--border-color);
  padding-left: var(--spacing-base);
  margin: var(--spacing-base) 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* ============================================
   IMAGES
   ============================================ */

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-base) 0;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  margin-top: calc(var(--spacing-base) * 2);
  padding-top: var(--spacing-base);
  border-top: 1px solid var(--border-color);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
}

/* ============================================
   LIBRARY SECTION SPECIFIC STYLES
   ============================================ */

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 3rem 2rem;
  margin-top: 2rem;
}

.book-item {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.book-cover {
  width: 100%;
}

.book-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 3;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  background: var(--bg-secondary);
}

.book-cover img:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.book-info {
  text-align: center;
}

.book-title {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  line-height: 1.3;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.book-author {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.3;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 2rem 1.5rem;
  }
}

/* ============================================
   RESPONSIVE DESIGN
   Mobile: < 768px
   Tablet: 768px - 1024px
   Desktop: > 1024px
   ============================================ */

/* Tablet and smaller */
@media (max-width: 1024px) {
  :root {
    --font-size-base: 17px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --font-size-base: 16px;
    --spacing-base: 1.25rem;
  }

  body {
    padding: 1rem;
  }

  .menu-toggle {
    display: flex;
  }

  nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    width: 100%;
    margin-top: 1rem;
  }

  nav.active {
    display: flex;
  }

  nav a {
    width: 100%;
    padding: 0.5rem 0;
  }

  .theme-switcher {
    margin-left: 0;
    width: 100%;
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
  }

  .theme-btn {
    flex: 1;
    text-align: center;
  }
}

/* Large desktop - increase font size slightly */
@media (min-width: 1400px) {
  :root {
    --font-size-base: 20px;
  }
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }

  header, footer, .theme-switcher {
    display: none;
  }
}