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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.7;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 { font-size: 2.5rem; margin-top: 0; }
h2 { font-size: 1.875rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; color: var(--text-secondary); }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

/* Lists */
ul, ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.25rem;
}

li > ul, li > ol {
  margin-top: 0.25rem;
  margin-bottom: 0;
}

/* Code */
code {
  font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  font-size: 0.875em;
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

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

pre code {
  background: none;
  padding: 0;
  font-size: 0.8rem;
  color: var(--pre-text);
  line-height: 1.4;
}

/* ASCII Art Diagrams - smaller font for better display */
pre code.language-text,
pre code.language-plaintext,
pre code:not([class]) {
  font-size: 0.75rem;
  line-height: 1.3;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid var(--accent-color);
  background-color: var(--blockquote-bg);
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

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

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
  overflow-x: auto;
  display: block;
}

th, td {
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  text-align: left;
}

th {
  background-color: var(--table-header-bg);
  font-weight: 600;
}

tr:nth-child(even) {
  background-color: var(--table-row-alt);
}

/* Horizontal Rule */
hr {
  border: none;
  border-top: 2px solid var(--border-color);
  margin: 2rem 0;
}

/* Navigation */
.navbar {
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--accent-color);
}

.brand-icon {
  font-size: 1.5rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Switcher */
.theme-switcher {
  position: relative;
}

.theme-btn {
  background: var(--btn-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s ease;
}

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

.theme-icon {
  font-size: 1.25rem;
}

.theme-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: var(--dropdown-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.5rem;
  min-width: 200px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 1000;
}

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

.theme-section {
  padding: 0.5rem 0;
}

.theme-section:not(:last-child) {
  border-bottom: 1px solid var(--border-color);
}

.theme-section-title {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.25rem;
}

.theme-option {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: none;
  background: none;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  border-radius: 6px;
  font-size: 0.875rem;
  transition: all 0.15s ease;
}

.theme-option:hover {
  background: var(--btn-hover-bg);
}

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

/* GitHub Link */
.github-link {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem 0;
  display: block;
}

.project-body img {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
}

/* Footer */
.footer {
  background-color: var(--nav-bg);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-meta {
  margin-top: 0.5rem;
  color: var(--text-muted);
}

/* Project Cards - Index Page */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: block;
}

.project-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

.project-card h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.125rem;
  color: var(--text-heading);
}

.project-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

.project-card .category {
  display: inline-block;
  background: var(--accent-color);
  color: var(--accent-text);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

/* Search/Filter */
.search-container {
  margin-bottom: 2rem;
}

.search-input {
  width: 100%;
  padding: 0.875rem 1.25rem;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  background: var(--input-bg);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-input::placeholder {
  color: var(--text-muted);
}

/* Category Filters */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.category-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--btn-bg);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.category-btn:hover,
.category-btn.active {
  background: var(--accent-color);
  color: var(--accent-text);
  border-color: var(--accent-color);
}

/* Stats */
.stats {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ASCII Art Diagrams */
pre.ascii-diagram {
  background: var(--diagram-bg);
  font-size: 0.8rem;
  line-height: 1.4;
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .nav-container {
    padding: 0.5rem 1rem;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .stats {
    justify-content: center;
  }

  table {
    font-size: 0.875rem;
  }

  th, td {
    padding: 0.5rem;
  }
}

/* Print styles */
@media print {
  .navbar, .footer, .theme-switcher {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }
}