/* CSS Variables for typography and theming */
@import url('/material-icons/material-icons.css');
:root {
  /* Typography */
  --font-body: 'Libre Baskerville', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Menlo', monospace;
  --font-heading: 'Libre Baskerville', 'Georgia', serif;
  
  /* Typewriter animation speeds (can be overridden by JS from DB) */
  --type-speed-ms: 80;
  --delete-speed-ms: 40;
  --pause-ms: 2000;
  
  /* Light mode colors */
  --bg-primary: #fdfcfa;
  --bg-secondary: #f8f6f2;
  --bg-tertiary: #f0ece4;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #6a6a6a;
  --border-color: #4a4a4a;
  --border-light: #ebe7df;
  --accent: #2c5282;
  --accent-hover: #1e3a5f;
  --link-color: #2c5282;
  --code-bg: #f5f2eb;
  --shadow-color: rgba(0, 0, 0, 0.06);
  
  /* Sizing */
  --container-max: 1200px;
  --container-wide: 500px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Borders */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

/* Dark mode */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #242424;
  --bg-tertiary: #2e2e2e;
  --text-primary: #e8e6e3;
  --text-secondary: #b8b5b0;
  --text-muted: #888580;
  --border-color: #3a3a3a;
  --border-light: #2e2e2e;
  --accent: #6b9bd1;
  --accent-hover: #8fb4e0;
  --link-color: #6b9bd1;
  --code-bg: #2a2a2a;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  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;
}

.material-icons {
  font-family: 'Material Icons' !important;
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'liga';
}

.app-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  min-height: 20px;
}

.app-icon svg {
  width: 20px;
  height: 20px;
  display: block;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: var(--spacing-sm); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

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

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

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

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-wide {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.site-header {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.site-logo img {
  height: 32px;
  width: auto;
}

.site-logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-primary);
  text-decoration: none;
}

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

.site-nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.theme-toggle {
  background: none;
  border: 0px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

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

/* Main content */
main {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* Home page keeps global main spacing behavior except top padding for hero flush layout */
.home-main {
  padding-top: 0;
}

/* Hero section */
.hero {
  position: relative;
  text-align: center;
  padding: var(--spacing-2xl) 0;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-xl);
}

#grid-hero {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
  /* transparent canvas overlay by default */
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0rem 0rem;
}

.hero-logo {
  margin-bottom: var(--spacing-lg);
}

.hero-logo img {
  height: 64px;
  width: auto;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  border: none;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-style: italic;
}

/* Typewriter */
.typewriter-container {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-muted);
  min-height: 1.5em;
}

.typewriter-verb {
  color: var(--accent);
}

.typewriter-word {
  color: var(--text-primary);
}

.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background-color: var(--accent);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 2px 8px var(--shadow-color);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  border: none;
}

.card-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--accent);
  color: white;
  border-radius: var(--radius-sm);
  margin-left: var(--spacing-sm);
  vertical-align: middle;
}

/* Content sections */
.section {
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  margin-bottom: var(--spacing-lg);
}

/* Markdown content */
.content {
  line-height: 1.8;
}

.content h1, .content h2, .content h3 {
  margin-top: var(--spacing-xl);
}

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

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

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

.content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.content pre {
  background: var(--code-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

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

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
}

.content th, .content td {
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
}

.content th {
  background: var(--bg-secondary);
  font-weight: 400;
}

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

.content em {
  font-style: italic;
}

.content strong {
  font-weight: 600;
}

.content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}
.content img[width] {
  width: auto;
  max-width: 100%;
}
.content .ql-align-center { text-align: center; }
.content .ql-align-right { text-align: right; }
.content .ql-align-justify { text-align: justify; }

.content a {
  overflow-wrap: anywhere;
  text-decoration: underline;
}

.content pre code.hljs {
  display: block;
  overflow-x: auto;
  padding: 0;
  background: transparent;
}

/* KaTeX styling */
.katex-display {
  margin: var(--spacing-lg) 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.katex {
  font-size: 1.1em;
}

.katex-error {
  color: #c53030;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Force display math to fit within cards */
.card .katex-display {
  overflow: hidden;
}

.card .katex-display > .katex {
  display: inline-block;
  transform-origin: left top;
  transform: scale(0.85);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

.form-help-error {
  color: #c53030;
}

[data-theme="dark"] .form-help-error {
  color: #feb2b2;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  box-sizing: border-box;
  min-height: 40px;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--bg-primary);
  color: var(--text-primary);
}

.btn:hover {
  background: var(--bg-secondary);
  border-color: var(--text-secondary);
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: white;
}

.btn-danger {
  background: #c53030;
  color: white;
  border-color: #c53030;
}

.btn-danger:hover {
  background: #9b2c2c;
  border-color: #9b2c2c;
  color: white;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.8rem;
  min-height: 32px;
}

/* Alerts */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid;
}

.alert-success {
  background: #f0fff4;
  border-color: #9ae6b4;
  color: #276749;
}

.alert-error {
  background: #fff5f5;
  border-color: #feb2b2;
  color: #c53030;
}

[data-theme="dark"] .alert-success {
  background: #1c3829;
  border-color: #2f6846;
  color: #9ae6b4;
}

[data-theme="dark"] .alert-error {
  background: #3c1c1c;
  border-color: #6b2c2c;
  color: #feb2b2;
}

/* Footer */
.site-footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: auto;
}

/* Blog list */
.post-list {
  list-style: none;
}

.post-item {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-light);
}

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

.post-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

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

/* Post detail */
.post-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.post-header h1 {
  border: none;
  margin-bottom: var(--spacing-sm);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* Utility */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* 404 Page */
.error-page {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.error-page h1 {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  border: none;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .header-inner {
    flex-wrap: wrap;
  }
  
  .site-nav {
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .theme-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}