/* ==========================================================================
   Minimal Theme - Style
   A clean, content-first design inspired by minimalist personal sites
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height: 1.7;
  --line-height-tight: 1.3;

  /* Colors - Light Mode */
  --color-bg: #fafafa;
  --color-bg-alt: #f0f0f0;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-text-light: #888888;
  --color-link: #1a1a1a;
  --color-link-hover: #555555;
  --color-border: #e0e0e0;
  --color-code-bg: #f4f4f4;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --max-width: 38rem;
  --header-height: 4rem;
}

/* Dark Mode - via data-theme attribute */
[data-theme="dark"] {
  --color-bg: #141414;
  --color-bg-alt: #1e1e1e;
  --color-text: #e8e8e8;
  --color-text-muted: #a0a0a0;
  --color-text-light: #707070;
  --color-link: #e8e8e8;
  --color-link-hover: #b0b0b0;
  --color-border: #2a2a2a;
  --color-code-bg: #1e1e1e;
}

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

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

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.site-header,
main,
.site-footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

main {
  flex: 1;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-name {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
}

.site-name:hover {
  color: var(--color-text-muted);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.nav-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease;
}

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

/* Show sun in dark mode, moon in light mode */
.icon-sun {
  display: none;
}

.icon-moon {
  display: block;
}

[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Home Page
   -------------------------------------------------------------------------- */
.home {
  padding-top: var(--space-2xl);
}

.home-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.home-photo {
  flex-shrink: 0;
}

.home-photo img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--color-bg-alt);
}

.home-intro {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.home-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin: 0;
}

.home-contact {
  display: flex;
  gap: var(--space-md);
}

.home-contact a {
  color: var(--color-text-muted);
  transition: color 0.15s ease;
  display: flex;
  align-items: center;
}

.home-contact a:hover {
  color: var(--color-text);
}

.home-bio {
  font-size: var(--font-size-base);
  color: var(--color-text);
  margin-bottom: var(--space-2xl);
  line-height: var(--line-height);
}

.home-section {
  margin-bottom: var(--space-2xl);
}

.home-section h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.post-item-empty {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.view-more {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.view-more:hover {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Single Page / Post
   -------------------------------------------------------------------------- */
.single-header {
  margin-bottom: var(--space-xl);
}

.single-header h1 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-sm);
}

.single-header time {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.single-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   Content Styles (Markdown)
   -------------------------------------------------------------------------- */
.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.content h1 {
  font-size: var(--font-size-2xl);
}

.content h2 {
  font-size: var(--font-size-xl);
}

.content h3 {
  font-size: var(--font-size-lg);
}

.content h4,
.content h5,
.content h6 {
  font-size: var(--font-size-base);
}

.content p {
  margin-bottom: var(--space-lg);
}

.content a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

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

.content ul,
.content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
}

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

.content li>ul,
.content li>ol {
  margin-top: var(--space-sm);
  margin-bottom: 0;
}

.content blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-lg);
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.content code {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.content pre {
  background-color: var(--color-code-bg);
  padding: var(--space-lg);
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

.content pre code {
  background: none;
  padding: 0;
  font-size: var(--font-size-sm);
}

.content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-2xl) 0;
}

.content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: var(--space-lg) 0;
}

/* --------------------------------------------------------------------------
   List Page (Blog Index)
   -------------------------------------------------------------------------- */
.list h1 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-xl);
}

.post-list {
  list-style: none;
  padding: 0;
}

.post-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.post-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
}

.post-item:first-child {
  padding-top: 0;
}

.post-item time {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-variant-numeric: tabular-nums;
}

.post-item a {
  font-size: var(--font-size-base);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.post-item a:hover {
  color: var(--color-text-muted);
}

.post-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Tags
   -------------------------------------------------------------------------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-bg-alt);
  border-radius: 4px;
  transition: all 0.15s ease;
}

.tag:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Research List
   -------------------------------------------------------------------------- */
.research-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.research-card {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-bg);
  transition: border-color 0.15s ease;
}

.research-card:hover {
  border-color: var(--color-text-muted);
}

.research-doctype {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.research-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-sm);
}

.research-title a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.15s ease;
}

.research-title a:hover {
  color: var(--color-text-muted);
}

.research-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height);
  margin-bottom: var(--space-md);
}

.research-meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.research-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-bg-alt);
  border-radius: 4px;
}

.research-badge svg {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Responsive Adjustments
   -------------------------------------------------------------------------- */
@media (min-width: 640px) {
  .post-item {
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-lg);
  }

  .post-item time {
    flex-shrink: 0;
    width: 6rem;
  }


}

@media (max-width: 480px) {
  :root {
    --font-size-2xl: 1.75rem;
    --font-size-xl: 1.25rem;
  }

  .home {
    padding-top: var(--space-xl);
  }
}