/**
 * MSiR Article Base Styles - November 2025
 * Core styles for blog post template following November 2025 design system
 */

/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
  /* Brand Colors */
  --scientific-cyan: #00A9E0;
  --mad-magenta: #FF3E8A;
  --experiment-orange: #FF9B42;
  --laboratory-dark: #2D3142;
  --flash-green: #57CC99;
  --paper-white: #F8F9FA;

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-base: 0.3s ease;
}

/* ========================================
   READING PROGRESS BAR
   ======================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--mad-magenta), var(--scientific-cyan));
  z-index: 1001;
  transition: width 0.1s ease;
}

/* ========================================
   BREADCRUMB NAVIGATION
   ======================================== */
.article-breadcrumb {
  background: white;
  padding: var(--space-md) 0;
  border-bottom: 1px solid #e9ecef;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  font-size: 0.9375rem;
  color: #6c757d;
}

.breadcrumb-item:not(:last-child)::after {
  content: '→';
  margin-left: var(--space-sm);
  color: #dee2e6;
}

.breadcrumb-link {
  color: var(--scientific-cyan);
  text-decoration: none;
  transition: color var(--transition-base);
}

.breadcrumb-link:hover {
  color: var(--mad-magenta);
}

.breadcrumb-current {
  color: var(--laboratory-dark);
  font-weight: 600;
}

/* ========================================
   ARTICLE HERO - DARK WITH PARTICLES
   ======================================== */
.article-hero {
  position: relative;
  background: linear-gradient(135deg,
    rgba(0, 169, 224, 0.15) 0%,
    rgba(0, 169, 224, 0.05) 100%
  ), var(--laboratory-dark);
  color: var(--paper-white);
  padding: calc(var(--space-4xl) + var(--space-xl)) var(--space-xl) var(--space-4xl);
  text-align: center;
  overflow: hidden;
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.particles-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  background: var(--scientific-cyan);
  border-radius: 50%;
  animation: float-particle linear infinite;
  pointer-events: none;
}

@keyframes float-particle {
  0%, 100% { transform: translateY(0) translateX(0); }
  25% { transform: translateY(-20px) translateX(10px); }
  50% { transform: translateY(-10px) translateX(-10px); }
  75% { transform: translateY(-30px) translateX(5px); }
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 900px;
  margin: 0 auto;
}

.category-badge {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  border: 2px solid var(--scientific-cyan);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

.article-hero h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 900;
  margin-bottom: var(--space-lg);
  background: linear-gradient(90deg, var(--scientific-cyan), var(--mad-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.article-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  opacity: 0.95;
}

.article-metadata {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  font-size: 1rem;
}

.metadata-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.difficulty-bars {
  display: flex;
  gap: 0.25rem;
}

.difficulty-bar {
  width: 8px;
  height: 18px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

.difficulty-bar.active {
  background: var(--scientific-cyan);
}

/* ========================================
   MAIN CONTENT LAYOUT
   ======================================== */
.article-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

/* ========================================
   ARTICLE CONTENT
   ======================================== */
.article-content {
  max-width: 800px;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: clamp(1.125rem, 2.5vw, 1.25rem);
  line-height: 1.8;
  color: var(--laboratory-dark);
}

.article-content h2 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--laboratory-dark);
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  scroll-margin-top: 100px; /* For TOC anchor scrolling */
}

.article-content h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--laboratory-dark);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  scroll-margin-top: 100px;
}

.article-content p {
  margin-bottom: var(--space-lg);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.article-content li {
  margin-bottom: var(--space-sm);
}

.article-content strong {
  font-weight: 600;
  color: var(--laboratory-dark);
}

.article-content em {
  font-style: italic;
}

.article-content code {
  font-family: 'Source Code Pro', monospace;
  background: #f8f9fa;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--mad-magenta);
}

/* ========================================
   AUTHOR SECTION
   ======================================== */
.article-author {
  max-width: 800px;
  margin: var(--space-4xl) auto;
  padding: var(--space-xl);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  gap: var(--space-xl);
  align-items: start;
}

.author-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-info h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.author-role {
  color: var(--scientific-cyan);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.author-bio {
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.author-social {
  display: flex;
  gap: var(--space-md);
}

.social-link {
  color: var(--laboratory-dark);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--scientific-cyan);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--scientific-cyan);
  color: white;
  transform: translateY(-2px);
}

/* ========================================
   SOCIAL SHARING
   ======================================== */
.article-sharing {
  max-width: 800px;
  margin: var(--space-2xl) auto;
  padding: var(--space-xl);
  background: #f8f9fa;
  border-radius: var(--radius-lg);
  text-align: center;
}

.article-sharing h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
}

.share-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: white;
  color: var(--laboratory-dark);
  text-decoration: none;
  border: 2px solid #e9ecef;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-base);
  cursor: pointer;
}

.share-btn:hover {
  border-color: var(--scientific-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.share-btn.copied {
  background: var(--flash-green);
  color: white;
  border-color: var(--flash-green);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
  .article-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .article-hero {
    padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
  }

  .article-hero h1 {
    font-size: clamp(2.5rem, 10vw, 3.5rem);
  }

  .article-metadata {
    gap: var(--space-md);
  }

  .article-main {
    padding: var(--space-xl) var(--space-lg);
  }

  .article-author {
    flex-direction: column;
    text-align: center;
  }

  .author-social {
    justify-content: center;
  }

  .share-buttons {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .particle {
    animation: none;
  }
}

/* Focus Visible */
:focus-visible {
  outline: 2px solid var(--scientific-cyan);
  outline-offset: 2px;
}