/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS Custom Properties for theming */
:root {
  --color-bg: #fafafa;
  --color-bg-secondary: #f5f5f7;
  --color-bg-code: #f0f0f2;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-muted: #86868b;
  --color-border: #d2d2d7;
  --color-border-light: #e8e8ed;
  --color-accent: #4f46e5;
  --color-accent-hover: #6366f1;
  --color-accent-shadow: rgba(79, 70, 229, 0.14);
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-shadow-subtle: rgba(0, 0, 0, 0.04);
  --font-heading: ui-serif, Georgia, "Times New Roman", serif;
}

[data-theme="dark"] {
  --color-bg: #1c1c1e;
  --color-bg-secondary: #2c2c2e;
  --color-bg-code: #3a3a3c;
  --color-text: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-muted: #8e8e93;
  --color-border: #48484a;
  --color-border-light: #3a3a3c;
  --color-accent: #a5b4fc;
  --color-accent-hover: #c7d2fe;
  --color-accent-shadow: rgba(165, 180, 252, 0.22);
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-subtle: rgba(0, 0, 0, 0.2);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Inter", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header and Navigation */
header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-light);
  padding: 6px 0 8px;
  margin-bottom: 16px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.logo a {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-shadow);
}

.theme-toggle:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-shadow);
}

/* Search Container */
.search-container {
  position: relative;
  width: 100%;
  max-width: 100%;
}

#search-input {
  width: 100%;
  padding: 10px 16px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  outline: none;
  transition: all 0.2s ease;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-weight: 400;
  letter-spacing: -0.011em;
}

#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-shadow);
}

#search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  margin-top: 6px;
  max-height: 400px;
  overflow-y: auto;
  box-shadow: 0 4px 24px var(--color-shadow), 0 0 1px var(--color-shadow-subtle);
  display: none;
  z-index: 1000;
}

#search-results.active {
  display: block;
}

.search-result-item {
  padding: 12px 20px;
  border-bottom: 1px solid var(--color-border-light);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.search-result-item:hover {
  background-color: var(--color-bg-secondary);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  font-size: 15px;
  letter-spacing: -0.011em;
}

.search-result-excerpt {
  color: var(--color-text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.search-no-results {
  padding: 20px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 15px;
}

/* Main Content */
main {
  min-height: calc(100vh - 200px);
  padding: 16px 0;
}

article {
  background: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 28px 0 16px;
  line-height: 1.25;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1.title {
  position: relative;
  font-size: 2.5rem;
  margin-top: 0;
  margin-bottom: 24px;
  padding-bottom: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1.title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: var(--color-accent);
}

h2 {
  font-size: 1.75rem;
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: 8px;
  margin-top: 40px;
}

h3 {
  font-size: 1.375rem;
  margin-top: 32px;
}

p {
  margin-bottom: 20px;
  line-height: 1.65;
}

.date {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 28px;
  font-weight: 400;
}

/* Post navigation (back to blog) */
.post-nav {
  margin-bottom: 8px;
}

.post-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background-image: none;
}

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

.post-nav-bottom {
  margin-top: 40px;
  margin-bottom: 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-border-light);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: color 0.2s ease, background-size 0.25s ease;
}

a:hover {
  color: var(--color-accent-hover);
  background-size: 100% 1px;
}

.logo a:hover {
  background-image: none;
}

/* Code */
code {
  background-color: var(--color-bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
  font-size: 0.875em;
  color: var(--color-text);
}

pre {
  background-color: var(--color-bg-code);
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 20px;
  border: 1px solid var(--color-border-light);
}

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

/* Lists */
ul, ol {
  margin-bottom: 20px;
  padding-left: 32px;
  line-height: 1.65;
}

li {
  margin-bottom: 6px;
}

/* Blog Post List */
.post-list {
  list-style: none;
  padding: 0;
}

.post-list-item {
  margin-bottom: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.post-list-item h2 {
  border: none;
  padding: 0;
  margin-bottom: 10px;
}

.post-list-item .date {
  margin-bottom: 10px;
}

/* Blog post entries generated by Pandoc (h2 + p with em date on blog listing) */
#blog-posts ~ h2,
#recent-posts ~ h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 6px;
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--color-bg-secondary);
  letter-spacing: -0.01em;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#blog-posts ~ h2:hover,
#recent-posts ~ h2:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px var(--color-shadow), 0 0 0 1px var(--color-accent-shadow);
}

#blog-posts ~ h2 a,
#recent-posts ~ h2 a {
  display: block;
  color: var(--color-text);
  background-image: none;
  transition: color 0.2s ease;
}

#blog-posts ~ h2 a:hover,
#recent-posts ~ h2 a:hover {
  color: var(--color-accent);
}

#blog-posts ~ h2 + p,
#recent-posts ~ h2 + p {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 0 4px;
  margin: 0 0 22px;
}

#blog-posts ~ h2 + p:last-child,
#recent-posts ~ h2 + p:last-child {
  margin-bottom: 0;
}

/* Activity Map */
.activity-map {
  margin: 16px 0 24px;
  overflow-x: auto;
}

.activity-map-row {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-bottom: 3px;
}

.activity-map-header {
  margin-bottom: 5px;
}

.activity-map-year-label {
  flex: 0 0 24px;
  width: 24px;
  overflow: hidden;
  white-space: nowrap;
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: right;
  padding-right: 4px;
}

.activity-cell-label {
  flex: 0 0 11px;
  width: 11px;
  overflow: hidden;
  white-space: nowrap;
  font-size: 9px;
  color: var(--color-text-muted);
  text-align: center;
  cursor: default;
}

.activity-cell {
  flex: 0 0 11px;
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: var(--color-border-light);
}

.activity-cell[data-level="1"] {
  background: color-mix(in srgb, var(--color-accent) 30%, var(--color-border-light));
}

.activity-cell[data-level="2"] {
  background: color-mix(in srgb, var(--color-accent) 60%, var(--color-border-light));
}

.activity-cell[data-level="3"] {
  background: var(--color-accent);
}

.activity-map-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 3px;
  margin-top: 5px;
}

.activity-map-legend-label {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* Footer */
footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: 8px 0;
  margin-top: 12px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 13px;
  letter-spacing: 0.01em;
}

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .nav-links {
    gap: 20px;
  }

  h1.title {
    font-size: 1.875rem;
  }

  #search-input {
    font-size: 0.9375rem;
    padding: 12px 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 14px;
  }

  h1.title {
    font-size: 1.625rem;
  }
}