/*
  DearCharlie — Unified Design System
  Generated: 2025-11-16
  Single source of truth for all site styles
*/

/* ============================================
   RESET & BASE
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --color-black: #000;
  --color-white: #fff;
  --color-gray-100: #fafafa;
  --color-gray-200: #f0f0f0;
  --color-gray-300: #e8e8e8;
  --color-gray-400: #e0e0e0;
  --color-gray-500: #999;
  --color-gray-600: #888;
  --color-gray-700: #666;
  --color-gray-800: #555;
  --color-gray-900: #333;
  
  /* Ticker accent colors */
  --ticker-science: #00d9ff;
  --ticker-space: #a78bfa;
  --ticker-brain: #fbbf24;
  --ticker-quantum: #60a5fa;
  --ticker-bio: #4ade80;
  --ticker-time: #f472b6;
  --ticker-ocean: #22d3ee;
  --ticker-crypto: #fb923c;
  --ticker-nature: #86efac;
  --ticker-physics: #c084fc;
  --ticker-human: #fca5a5;
  --ticker-energy: #fde047;
  --ticker-data: #818cf8;
  --ticker-chem: #a3e635;
  --ticker-speed: #f87171;
  --ticker-weird: #d946ef;
  --ticker-life: #34d399;
  --ticker-cosmos: #38bdf8;
  --ticker-neuro: #fb7185;
  --ticker-extreme: #67e8f9;
  
  /* Layout */
  --max-width: 1400px;
  --max-width-content: 700px;
  --max-width-archive: 900px;
  --max-width-article: 720px;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 5rem;
  --spacing-3xl: 6rem;
  --spacing-4xl: 8rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  --font-mono: 'Courier New', 'Monaco', monospace;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
}

body {
  font-family: var(--font-sans);
  background: var(--color-white);
  color: var(--color-black);
  line-height: 1.6;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -1px;
}

h2 {
  font-size: 2rem;
  font-weight: 800;
}

h3 {
  font-size: 1.5rem;
  font-weight: 700;
}

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

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

a:hover {
  opacity: 0.7;
}

/* ============================================
   NAVIGATION
   ============================================ */
.header-sticky {
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  background: var(--color-black);
  padding: var(--spacing-sm) 0;
}

nav .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  color: var(--color-white);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.5px;
}

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

nav .nav-links a {
  color: var(--color-white);
  text-decoration: none;
  font-size: 0.85rem;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

nav .nav-links a:hover {
  opacity: 1;
}

/* ============================================
   TICKER
   ============================================ */
.ticker-wrapper {
  background: linear-gradient(90deg, var(--color-black) 0%, #0a0a0a 50%, var(--color-black) 100%);
  border-bottom: 1px solid #222;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.5);
}

.ticker {
  display: flex;
  white-space: nowrap;
  animation: scroll-ticker 180s linear infinite;
  padding: 0.9rem 0;
}

.ticker:hover {
  animation-play-state: paused;
}

@keyframes scroll-ticker {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.ticker-item {
  padding: 0 3rem;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.5px;
}

.ticker-icon {
  font-size: 1.3rem;
  filter: drop-shadow(0 0 4px currentColor);
}

.ticker-label {
  color: var(--color-gray-600);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 1px;
}

.ticker-value {
  color: var(--color-white);
  font-weight: 700;
  font-size: 0.85rem;
  text-shadow: 0 0 8px rgba(255,255,255,0.3);
}

/* Ticker category colors */
.ticker-science .ticker-icon,
.ticker-science .ticker-value { color: var(--ticker-science); }
.ticker-space .ticker-icon,
.ticker-space .ticker-value { color: var(--ticker-space); }
.ticker-brain .ticker-icon,
.ticker-brain .ticker-value { color: var(--ticker-brain); }
.ticker-quantum .ticker-icon,
.ticker-quantum .ticker-value { color: var(--ticker-quantum); }
.ticker-bio .ticker-icon,
.ticker-bio .ticker-value { color: var(--ticker-bio); }
.ticker-time .ticker-icon,
.ticker-time .ticker-value { color: var(--ticker-time); }
.ticker-ocean .ticker-icon,
.ticker-ocean .ticker-value { color: var(--ticker-ocean); }
.ticker-crypto .ticker-icon,
.ticker-crypto .ticker-value { color: var(--ticker-crypto); }
.ticker-nature .ticker-icon,
.ticker-nature .ticker-value { color: var(--ticker-nature); }
.ticker-physics .ticker-icon,
.ticker-physics .ticker-value { color: var(--ticker-physics); }
.ticker-human .ticker-icon,
.ticker-human .ticker-value { color: var(--ticker-human); }
.ticker-energy .ticker-icon,
.ticker-energy .ticker-value { color: var(--ticker-energy); }
.ticker-data .ticker-icon,
.ticker-data .ticker-value { color: var(--ticker-data); }
.ticker-chem .ticker-icon,
.ticker-chem .ticker-value { color: var(--ticker-chem); }
.ticker-speed .ticker-icon,
.ticker-speed .ticker-value { color: var(--ticker-speed); }
.ticker-weird .ticker-icon,
.ticker-weird .ticker-value { color: var(--ticker-weird); }
.ticker-life .ticker-icon,
.ticker-life .ticker-value { color: var(--ticker-life); }
.ticker-cosmos .ticker-icon,
.ticker-cosmos .ticker-value { color: var(--ticker-cosmos); }
.ticker-neuro .ticker-icon,
.ticker-neuro .ticker-value { color: var(--ticker-neuro); }
.ticker-extreme .ticker-icon,
.ticker-extreme .ticker-value { color: var(--ticker-extreme); }

/* ============================================
   HERO SECTION (index.html)
   ============================================ */
.hero {
  max-width: var(--max-width);
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  min-height: 500px;
}

.hero-image {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.hero-content {
  padding: var(--spacing-md) 0;
}

.hero-meta {
  font-size: 0.7rem;
  color: var(--color-gray-500);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--color-black);
}

.hero-excerpt {
  font-size: 1.2rem;
  color: var(--color-gray-800);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.hero-link {
  display: inline-block;
  padding: var(--spacing-sm) 2.5rem;
  background: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: transform var(--transition-fast);
}

.hero-link:hover {
  transform: translateY(-2px);
  opacity: 1;
}

/* ============================================
   FEATURED GRID
   ============================================ */
.featured-section {
  max-width: var(--max-width);
  margin: var(--spacing-2xl) auto var(--spacing-lg);
  padding: 0 var(--spacing-md);
}

.section-title {
  font-size: 1.2rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-lg);
  text-align: center;
  color: var(--color-black);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.featured-card {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  aspect-ratio: 4/3;
  cursor: pointer;
  transition: transform var(--transition-medium);
}

.featured-card:hover {
  transform: translateY(-8px);
}

.featured-card:nth-child(1) {
  grid-column: span 2;
  grid-row: span 2;
  aspect-ratio: auto;
}

.featured-card:nth-child(4) {
  grid-column: span 2;
  aspect-ratio: 16/9;
}

.featured-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
  color: var(--color-white);
}

.featured-card:nth-child(1) .featured-overlay {
  padding: var(--spacing-lg);
}

.featured-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.3;
}

.featured-card:nth-child(1) .featured-card-title {
  font-size: 1.8rem;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section {
  max-width: 800px;
  margin: var(--spacing-3xl) auto;
  padding: 0 var(--spacing-md);
}

.about-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-md);
  text-align: center;
  color: var(--color-gray-500);
}

.about-content {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--color-gray-900);
  text-align: left;
}

.about-content p {
  margin-bottom: 1.5rem;
}

/* ============================================
   COMPACT ARTICLES LIST
   ============================================ */
.all-articles {
  max-width: var(--max-width);
  margin: var(--spacing-2xl) auto;
  padding: 0 var(--spacing-md);
}

.compact-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 0.75rem;
}

.compact-article {
  border-bottom: 1px solid var(--color-gray-300);
  transition: background var(--transition-fast);
}

.compact-article:hover {
  background: var(--color-gray-100);
}

.compact-link {
  display: block;
  padding: var(--spacing-sm) 1.25rem;
  text-decoration: none;
  color: var(--color-black);
}

.compact-link:hover .compact-title {
  text-decoration: underline;
}

.compact-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
}

/* ============================================
   CONTENT PAGE (about.html, etc.)
   ============================================ */
.content {
  max-width: var(--max-width-content);
  margin: var(--spacing-3xl) auto;
  padding: 0 var(--spacing-md);
  line-height: 1.9;
}

.content h1 {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: var(--spacing-lg);
  color: var(--color-black);
}

.content p {
  font-size: 1.1rem;
  color: var(--color-gray-900);
  margin-bottom: 1.5rem;
}

.content a {
  color: var(--color-black);
  text-decoration: underline;
}

/* ============================================
   ARCHIVE PAGE
   ============================================ */
.archive-hero {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-lg);
  border-bottom: 2px solid var(--color-black);
}

.archive-hero h1 {
  font-size: 4rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -3px;
  margin-bottom: var(--spacing-sm);
}

.archive-hero p {
  font-size: 1.1rem;
  color: var(--color-gray-700);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.archive-content {
  max-width: var(--max-width-archive);
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
}

.archive-stats {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  font-family: var(--font-mono);
  text-align: center;
}

.archive-stats span {
  font-size: 2rem;
  font-weight: 900;
  margin: 0 var(--spacing-md);
}

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

.post-item {
  border-bottom: 1px solid var(--color-gray-400);
  padding: var(--spacing-md) 0;
  transition: all var(--transition-fast);
}

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

.post-item:hover {
  background: var(--color-gray-100);
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  margin-left: -1.5rem;
  margin-right: -1.5rem;
}

.post-link {
  text-decoration: none;
  color: var(--color-black);
  display: block;
}

.post-meta {
  font-size: 0.75rem;
  color: var(--color-gray-700);
  margin-bottom: 0.7rem;
}

.post-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.post-tags {
  margin-top: var(--spacing-xs);
}

.tag-badge {
  display: inline-block;
  padding: 0.2rem var(--spacing-xs);
  background: #fef3c7;
  color: #92400e;
  font-size: 0.7rem;
  margin-right: var(--spacing-xs);
  border-radius: 2px;
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-hero {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-lg);
  border-bottom: 2px solid var(--color-black);
}

.contact-hero h1 {
  font-size: 4rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -3px;
  margin-bottom: var(--spacing-sm);
}

.contact-hero p {
  font-size: 1.1rem;
  color: var(--color-gray-700);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
  font-style: italic;
}

.contact-content {
  max-width: var(--max-width-content);
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
}

.contact-section {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-400);
}

.contact-section:last-child {
  border-bottom: none;
}

.contact-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  margin-bottom: var(--spacing-sm);
}

.contact-section p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-sm);
}

.contact-section a {
  color: var(--color-black);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--color-black);
  transition: opacity var(--transition-fast);
}

.contact-section a:hover {
  opacity: 0.7;
}

.contact-form {
  margin-top: var(--spacing-md);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-black);
  background: var(--color-white);
  font-size: 1rem;
  font-family: inherit;
}

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

.submit-btn {
  background: var(--color-black);
  color: var(--color-white);
  border: 2px solid var(--color-black);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.submit-btn:hover {
  background: var(--color-white);
  color: var(--color-black);
}

/* ============================================
   ARTICLE POST STYLES
   ============================================ */
.article-header {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  border-bottom: 1px solid var(--color-gray-300);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-md);
}

.article-content {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.article-content h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.article-content p {
  margin-bottom: 1.5rem;
  color: var(--color-gray-900);
}

.article-content ul,
.article-content ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-md);
}

.article-content li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-gray-900);
}

.article-content blockquote {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 2px solid var(--color-black);
  background: var(--color-gray-200);
  font-style: italic;
}

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

.article-content a {
  color: var(--color-black);
  text-decoration: underline;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
  background: var(--color-black);
  color: var(--color-gray-600);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  text-align: center;
  font-size: 0.85rem;
  margin-top: var(--spacing-4xl);
}

.footer-links {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
  opacity: 1;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 968px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .hero-image {
    height: 400px;
    order: -1;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .featured-grid {
    grid-template-columns: 1fr;
  }
  
  .featured-card:nth-child(1),
  .featured-card:nth-child(4) {
    grid-column: span 1;
    grid-row: span 1;
  }
  
  .compact-list {
    grid-template-columns: 1fr;
  }
  
  .archive-hero h1 {
    font-size: 3rem;
  }
  
  .contact-hero h1 {
    font-size: 3rem;
  }
  
  .article-title {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  nav .nav-links {
    gap: var(--spacing-sm);
  }
  
  .hero {
    min-height: auto;
  }
  
  .article-content h2 {
    font-size: 1.5rem;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.filter-notice {
  max-width: var(--max-width-archive);
  margin: var(--spacing-md) auto;
  padding: var(--spacing-sm) var(--spacing-md);
  background: #fef3c7;
  border-left: 4px solid #92400e;
  color: #92400e;
  font-size: 0.9rem;
  display: none;
}

.filter-notice.active {
  display: block;
}

.clear-filter {
  background: none;
  border: none;
  color: #92400e;
  text-decoration: underline;
  cursor: pointer;
  font-weight: 600;
}