/* CSS Custom Properties for Theme System */
:root {
  /* Light theme (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --text-inverse: #ffffff;
  --border-color: #e1e5e9;
  --accent-primary: #3498db;
  --accent-secondary: #2980b9;
  --accent-gradient-start: #667eea;
  --accent-gradient-end: #764ba2;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --code-bg: #f1f2f6;
  --code-block-bg: #2c3e50;
  --code-block-text: #ecf0f1;
  --blockquote-bg: #f8f9fa;
  --blockquote-border: #3498db;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-tertiary: #808080;
  --text-inverse: #1a1a1a;
  --border-color: #404040;
  --accent-primary: #4a9eff;
  --accent-secondary: #357abd;
  --accent-gradient-start: #4a9eff;
  --accent-gradient-end: #6b73ff;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.4);
  --code-bg: #2d2d2d;
  --code-block-bg: #1a1a1a;
  --code-block-text: #e0e0e0;
  --blockquote-bg: #2d2d2d;
  --blockquote-border: #4a9eff;
}

/* Auto theme - respects system preference */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --text-inverse: #1a1a1a;
    --border-color: #404040;
    --accent-primary: #4a9eff;
    --accent-secondary: #357abd;
    --accent-gradient-start: #4a9eff;
    --accent-gradient-end: #6b73ff;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --code-bg: #2d2d2d;
    --code-block-bg: #1a1a1a;
    --code-block-text: #e0e0e0;
    --blockquote-bg: #2d2d2d;
    --blockquote-border: #4a9eff;
  }
}

/* Fallback for auto theme when system detection fails */
[data-theme="auto"].auto-dark {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-tertiary: #808080;
  --text-inverse: #1a1a1a;
  --border-color: #404040;
  --accent-primary: #4a9eff;
  --accent-secondary: #357abd;
  --accent-gradient-start: #4a9eff;
  --accent-gradient-end: #6b73ff;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.4);
  --code-bg: #2d2d2d;
  --code-block-bg: #1a1a1a;
  --code-block-text: #e0e0e0;
  --blockquote-bg: #2d2d2d;
  --blockquote-border: #4a9eff;
}

[data-theme="auto"].auto-light {
  /* Uses default light theme variables from :root */
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: color 0.3s ease, background-color 0.3s ease;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Main content */
.main-content {
  min-height: calc(100vh - 140px);
  padding: 2rem 0;
}

/* Home page */
.hero {
  text-align: center;
  margin-bottom: 3rem;
  padding: 3rem 0;
  background: linear-gradient(
    135deg,
    var(--accent-gradient-start) 0%,
    var(--accent-gradient-end) 100%
  );
  color: var(--text-inverse);
  border-radius: 10px;
  margin-left: -20px;
  margin-right: -20px;
  transition: background 0.3s ease;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
}

.posts h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.post-list {
  list-style: none;
}

.post-item {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  transition: transform 0.3s ease, box-shadow 0.3s ease,
    background-color 0.3s ease;
}

.post-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--shadow-light);
}

.post-link {
  text-decoration: none;
  color: inherit;
}

.post-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.post-excerpt {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.post-date {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.view-all {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  color: var(--text-inverse);
  text-decoration: none;
  border-radius: 5px;
  font-weight: 500;
  transition: background 0.3s ease;
}

.view-all:hover {
  background: var(--accent-secondary);
}

/* Post page */
.post {
  max-width: 700px;
  margin: 0 auto;
}

.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.3s ease;
}

.post-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.post-meta {
  display: flex;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 3rem;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.post-content h1 {
  font-size: 2rem;
}
.post-content h2 {
  font-size: 1.75rem;
}
.post-content h3 {
  font-size: 1.5rem;
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  background: var(--blockquote-bg);
  border-left: 4px solid var(--blockquote-border);
  font-style: italic;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.post-content code {
  background: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.9em;
  transition: background-color 0.3s ease;
}

.post-content pre {
  background: var(--code-block-bg);
  color: var(--code-block-text);
  padding: 1.5rem;
  border-radius: 5px;
  overflow-x: auto;
  margin: 2rem 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Image styles */
.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.post-content img:hover {
  transform: scale(1.02);
  transition: transform 0.3s ease;
}

.post-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  transition: border-color 0.3s ease;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.post-nav-link {
  flex: 1;
  padding: 1rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 5px;
  transition: background 0.3s ease;
  font-weight: 500;
}

.post-nav-link:hover {
  background: var(--bg-tertiary);
}

.post-nav-link.prev {
  text-align: left;
}

.post-nav-link.next {
  text-align: right;
}

/* Footer */
.site-footer {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 2rem 0;
  text-align: center;
  margin-top: 3rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.site-footer p {
  margin-bottom: 0.5rem;
}

.site-footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Theme Toggle Dropdown Component */
.theme-toggle {
  position: relative;
  display: inline-block;
  margin-left: auto;
  z-index: 10000;
}

.theme-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 80px;
  justify-content: space-between;
  gap: 8px;
}

.theme-toggle-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

.theme-toggle-btn::after {
  content: "▼";
  font-size: 0.7rem;
  transition: transform 0.3s ease;
}

.theme-toggle-btn.open::after {
  transform: rotate(180deg);
}

.theme-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 4px 12px var(--shadow-light);
  min-width: 120px;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  margin-top: 4px;
}

.theme-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.theme-dropdown-option {
  display: block;
  width: 100%;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
  border-radius: 0;
}

.theme-dropdown-option:first-child {
  border-radius: 8px 8px 0 0;
}

.theme-dropdown-option:last-child {
  border-radius: 0 0 8px 8px;
}

.theme-dropdown-option:hover {
  background: var(--bg-secondary);
  color: var(--accent-primary);
}

.theme-dropdown-option.active {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

.theme-dropdown-option.active:hover {
  background: var(--accent-secondary);
}

/* Responsive design */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .post-title {
    font-size: 2rem;
  }

  .post-nav {
    flex-direction: column;
  }

  .container {
    padding: 0 15px;
  }

  .post-content img {
    margin: 1.5rem auto;
    border-radius: 6px;
  }
}

/* Posts Page Styles */
.posts-page h1 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--text-primary);
  text-align: center;
}

.posts-list {
  max-width: 700px;
  margin: 0 auto;
}

.post-summary {
  background: var(--bg-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  border-radius: 8px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.post-summary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--shadow-light);
}

.post-summary .post-title {
  margin-bottom: 1rem;
}

.post-summary .post-title a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 600;
}

.post-summary .post-title a:hover {
  color: var(--accent-primary);
}

.post-summary .post-meta {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.post-summary .post-excerpt {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.read-more {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
}

.read-more:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .site-nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    justify-content: center;
  }

  .hero {
    padding: 2rem 0;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .posts-page h1 {
    font-size: 2rem;
  }

  .post-summary {
    padding: 1.5rem;
  }

  .post-summary .post-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}