/* CSS Variables - Light mode (default) */
:root {
  --bg-color: #ebe5e6;
  --text-color: #1a1a1a;
  --text-muted: #666666;
  --accent-color: #2d8a52;
  --accent-hover: #236b40;
  --border-color: #e5e5e5;
  --code-bg: #f6f8fa;
  --code-border: #e1e4e8;
  --blockquote-border: #dfe2e5;
  --blockquote-bg: #f6f8fa;
}

/* Dark mode via CSS-only toggle */
html:has(#theme-switch:checked) {
  --bg-color: #1f222a;
  --text-color: #ffffff;
  --text-muted: #a0a0a0;
  --accent-color: #78E2A0;
  --accent-hover: #9aeab8;
  --border-color: #3a3a4a;
  --code-bg: #2d2d3a;
  --code-border: #3a3a4a;
  --blockquote-border: #3a3a4a;
  --blockquote-bg: #2d2d3a;
}

/* Shiki dual theme support */
/* Light mode: use the inline color styles (default behavior) */
.shiki {
  background-color: var(--code-bg) !important;
}

/* Dark mode: switch to the --shiki-dark CSS variable */
html:has(#theme-switch:checked) .shiki span {
  color: var(--shiki-dark) !important;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.74;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Theme toggle - hidden checkbox */
.theme-switch {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* Theme toggle with sun/moon icons */
.theme-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 0.25rem;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

.theme-toggle svg {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.theme-toggle:hover svg {
  color: var(--accent-color);
}

/* Light mode: show sun, hide moon */
.icon-sun {
  display: block;
}

.icon-moon {
  display: none;
}

/* Dark mode: show moon, hide sun */
html:has(#theme-switch:checked) .icon-sun {
  display: none;
}

html:has(#theme-switch:checked) .icon-moon {
  display: block;
}

/* Container */
.container {
  max-width: 864px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* Main content */
.main {
  min-height: 60vh;
  padding-bottom: 3rem;
}

/* Post list */
.posts {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.post-preview {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

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

.post-preview .post-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

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

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

/* Post */
.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

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

.post-content,
.page-content {
  font-size: 1.1rem;
}

.post-content h2,
.page-content h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.post-content h3,
.page-content h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.post-content h4,
.page-content h4 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

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

.post-content a,
.page-content a {
  color: var(--accent-color);
  text-decoration: none;
}

.post-content a:hover,
.page-content a:hover {
  text-decoration: underline;
}

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

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

.post-content img,
.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 1.5rem 0;
}

/* Code */
code {
  font-family: "Fira Code", "Monaco", "Consolas", monospace;
  font-size: 0.9em;
}

:not(pre) > code {
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--code-border);
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Shiki code block styling */
.shiki {
  background-color: var(--code-bg) !important;
  border: 1px solid var(--code-border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.shiki code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Blockquote */
blockquote {
  border-left: 4px solid var(--blockquote-border);
  background-color: var(--blockquote-bg);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 4px 4px 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* PDF Viewer */
.pdf-viewer {
  margin: 2rem 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.pdf-container {
  background-color: var(--code-bg);
  min-height: 600px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: auto;
}

.pdf-canvas {
  max-width: 100%;
}

.pdf-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
}

.pdf-controls button {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.2s ease;
}

.pdf-controls button:hover {
  background-color: var(--accent-hover);
}

.pdf-page-info {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pdf-error {
  color: #dc3545;
  padding: 2rem;
  text-align: center;
}

/* Footer */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }

  .post-title {
    font-size: 1.5rem;
  }

  .post-content,
  .page-content {
    font-size: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }
}