/* ========================================
   CAKE THEME - CSS Styles
   Clean, editorial design with warm neutrals
   ======================================== */

/* CSS Custom Properties */
:root {
  --font-mono: 'JetBrains Mono', monospace;

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

  /* Layout */
  --max-width: 720px;
  --header-height: 60px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Light theme (default - warm cream) */
[data-theme="light"] {
  --bg-primary: #FAF9F7;
  --bg-secondary: #F5F4F1;
  --bg-tertiary: #EFEEE9;
  --text-primary: #2D2D2D;
  --text-secondary: #5C5C5C;
  --text-muted: #8A8A8A;
  --accent: #6B7280;
  --accent-hover: #4B5563;
  --border: #E5E4E0;
  --border-light: #EDECE8;
}

/* Dark theme (warm dark) */
[data-theme="dark"] {
  --bg-primary: #1A1917;
  --bg-secondary: #242320;
  --bg-tertiary: #2E2D29;
  --text-primary: #E8E6E3;
  --text-secondary: #A8A6A0;
  --text-muted: #737067;
  --accent: #A8A6A0;
  --accent-hover: #D4D2CC;
  --border: #3A3835;
  --border-light: #2E2D29;
}

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

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.8;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-secondary);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-md) 0;
  font-weight: 600;
  line-height: 1.3;
}

p {
  margin: 0 0 var(--spacing-md) 0;
}

img {
  max-width: 100%;
  height: auto;
}

/* ========================================
   LAYOUT
   ======================================== */

.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

/* ========================================
   HEADER - Minimal design
   ======================================== */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

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

.site-title {
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(
    90deg,
    #ff6b6b,
    #feca57,
    #48dbfb,
    #ff9ff3,
    #54a0ff,
    #5f27cd,
    #ff6b6b
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: rainbow-shift 8s linear infinite;
}

.site-title:hover {
  animation-duration: 2s;
}

@keyframes rainbow-shift {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.header-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.header-link:hover {
  color: var(--text-primary);
}

.toc-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.toc-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

/* Theme toggle icons */
[data-theme="dark"] .sun-icon {
  display: block;
}

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

[data-theme="light"] .sun-icon {
  display: none;
}

[data-theme="light"] .moon-icon {
  display: block;
}

/* ========================================
   TOC DRAWER
   ======================================== */

.toc-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 200;
}

.toc-overlay.active {
  opacity: 1;
  visibility: visible;
}

.toc-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background-color: var(--bg-primary);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  z-index: 201;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border-light);
}

.toc-drawer.active {
  transform: translateX(0);
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
}

.toc-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.toc-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  color: var(--text-muted);
}

.toc-close:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: var(--spacing-sm) 0;
  overflow-y: auto;
  flex: 1;
}

.toc-item a {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.toc-item a:hover {
  background-color: var(--bg-secondary);
}

.toc-item-title {
  font-weight: 500;
}

.toc-item-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.toc-item-about {
  border-top: 1px solid var(--border-light);
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
}

.toc-item.hidden {
  display: none;
}

.toc-tags {
  border-top: 1px solid var(--border-light);
}

.toc-tags-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.toc-tags-toggle:hover {
  background-color: var(--bg-secondary);
}

.toc-tags-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.toc-tags-chevron {
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.toc-tags.expanded .toc-tags-chevron {
  transform: rotate(180deg);
}

.toc-tags-list {
  display: none;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  padding: 0 var(--spacing-md) var(--spacing-md);
  max-height: 200px;
  overflow-y: auto;
}

.toc-tags.expanded .toc-tags-list {
  display: flex;
}

.tag-filter {
  font-size: 0.8rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tag-filter:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.tag-filter.active {
  background-color: var(--text-primary);
  color: var(--bg-primary);
}

/* Tag filter indicator */
.tag-filter-indicator {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-radius: 6px;
  font-size: 0.85rem;
}

.tag-filter-indicator.active {
  display: flex;
}

.tag-filter-label {
  color: var(--text-muted);
}

.tag-filter-name {
  font-weight: 600;
  color: var(--text-primary);
}

.tag-filter-close {
  margin-left: auto;
  padding: 4px;
  border-radius: 4px;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.tag-filter-close:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* ========================================
   POST CARDS - Minimal, no borders
   ======================================== */

.posts-container {
  display: flex;
  flex-direction: column;
}

.post-card {
  padding: var(--spacing-2xl) 0;
  border-bottom: 1px solid var(--border-light);
}

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

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

.post-card.hidden {
  display: none;
}

/* Post meta (date, read time) */
.post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

.post-meta-sep {
  color: var(--text-muted);
}

/* Post title - clickable */
.post-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--text-primary);
  line-height: 1.4;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.post-title:hover {
  color: var(--text-secondary);
}

/* Tags in header area */
.post-tags-header {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tag-link {
  font-size: 0.8rem;
  padding: 2px 8px;
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-mono);
}

.tag-link:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

/* Post snippet with fade */
.post-snippet {
  position: relative;
  color: var(--text-secondary);
  line-height: 1.8;
}

.post-snippet p {
  margin: 0;
}

.post-snippet-fade {
  position: relative;
  max-height: 5.4em; /* roughly 3 lines */
  overflow: hidden;
}

.post-snippet-fade::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2em;
  background: linear-gradient(transparent, var(--bg-primary));
  pointer-events: none;
}

/* Read more link */
.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.read-more-icon {
  transition: transform var(--transition-fast);
}

.post-card.expanded .read-more-icon {
  transform: rotate(180deg);
}

.post-card.expanded .read-more-text::after {
  content: 'less';
}

.post-card:not(.expanded) .read-more-text::after {
  content: 'more';
}

/* Post content (expandable) */
.post-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.post-card.expanded .post-content {
  max-height: 50000px;
}

/* Hide snippet when expanded since full content includes it */
.post-card.expanded .post-snippet {
  display: none;
}

/* Collapse button at bottom of expanded post */
.collapse-btn {
  display: none;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-mono);
}

.collapse-btn:hover {
  color: var(--text-primary);
  border-color: var(--border);
}

.post-card.expanded .collapse-btn {
  display: inline-flex;
}

.post-body {
  padding-top: var(--spacing-md);
  color: var(--text-primary);
}

.post-body > :first-child {
  margin-top: 0;
}

.post-body h2 {
  font-size: 1.1rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-body h3 {
  font-size: 1rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.post-body pre {
  background-color: var(--bg-secondary);
  border-radius: 6px;
  padding: var(--spacing-md);
  overflow-x: auto;
  font-size: 0.9rem;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.post-body p code {
  background-color: var(--bg-secondary);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

.post-body blockquote {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--border);
  color: var(--text-secondary);
  font-style: italic;
}

.post-body ul, .post-body ol {
  padding-left: var(--spacing-lg);
}

.post-body li {
  margin-bottom: var(--spacing-xs);
}

.post-body img {
  border-radius: 6px;
  margin: var(--spacing-md) 0;
}

/* Post tags (shown at bottom when expanded) */
.post-tags {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.tag {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========================================
   SINGLE POST/PAGE (About, etc)
   ======================================== */

.single-post {
  max-width: var(--max-width);
  margin: 0 auto;
}

.single-header {
  margin-bottom: var(--spacing-xl);
}

.single-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.single-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.single-content {
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.single-content p {
  margin-bottom: var(--spacing-md);
}

.single-footer {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--text-primary);
}

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

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-md);
  text-align: center;
}

.footer-content {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-sep {
  margin: 0 var(--spacing-sm);
}

.footer-content a {
  color: var(--text-muted);
}

.footer-content a:hover {
  color: var(--text-primary);
}

/* ========================================
   LIST PAGES
   ======================================== */

.list-page {
  max-width: var(--max-width);
  margin: 0 auto;
}

.list-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
}

.list-items {
  list-style: none;
  padding: 0;
  margin: 0;
}

.list-items li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-light);
}

.list-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 640px) {
  body {
    font-size: 14px;
  }

  .site-header {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .site-title {
    font-size: 0.9rem;
  }

  .post-title {
    font-size: 1.1rem;
  }

  .post-card {
    padding: var(--spacing-xl) 0;
  }

  .toc-drawer {
    width: 280px;
  }
}

/* ========================================
   UTILITIES
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}