/* ============================================================================
   CSS Custom Properties (Design Tokens)
   ============================================================================ */

:root {
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.25rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.3125rem;
  --radius-md: 0.5rem;

  /* Image Constraints */
  --img-hero-max: 25rem;
  --img-container-max: 31.25rem;
  --img-thumbnail-height: 6rem;
  --img-pcb-max: 12.5rem;

  /* Grid */
  --grid-gap-sm: var(--spacing-lg);
  --grid-gap-md: var(--spacing-xl);
  --grid-min-card: 18.75rem;
  --grid-min-pcb: 12.5rem;

  /* Transitions */
  --transition-base: 0.2s ease;
}


/* ============================================================================
   Button Components
   ============================================================================ */

.btn {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  font-family: 'DM Sans', -apple-system, sans-serif;
  cursor: pointer;
  text-align: center;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  border: 1px solid var(--border, rgba(255,255,255,0.15));
  color: var(--text-dim, rgba(255,255,255,0.6));
  background: transparent;
}

.btn:hover {
  color: var(--text, #fff);
  border-color: var(--border-lt, rgba(255,255,255,0.3));
  background: var(--surface, rgba(255,255,255,0.05));
}

.btn-primary {
  background: var(--surface, rgba(255,255,255,0.05));
  color: var(--text, #fff);
  border-color: var(--border-lt, rgba(255,255,255,0.2));
}

.btn-secondary {
  background: transparent;
  color: var(--text-dim, rgba(255,255,255,0.55));
  border-color: var(--border, rgba(255,255,255,0.12));
}

.btn-secondary:hover {
  color: var(--text, #fff);
  border-color: var(--border-lt, rgba(255,255,255,0.3));
  background: var(--surface, rgba(255,255,255,0.05));
}

.btn-link {
  background: transparent;
  color: var(--text-dim, rgba(255,255,255,0.55));
  padding: var(--spacing-xs) var(--spacing-sm);
  border: none;
}

.btn-link:hover {
  color: var(--text, #fff);
  background: transparent;
  border: none;
}


/* ============================================================================
   Text Components
   ============================================================================ */

.intro-text {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
  color: var(--text-dim, rgba(255,255,255,0.7));
}

.project-date {
  margin: -0.75rem 0 var(--spacing-xl);
  color: var(--text-faint, rgba(255,255,255,0.4));
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0;
}


/* ============================================================================
   Image Components
   ============================================================================ */

img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

.image-container {
  display: flex;
  justify-content: center;
  margin: var(--spacing-md) 0;
  max-width: 100%;
  overflow: hidden;
}

.image-container img {
  max-width: min(var(--img-container-max), 100%) !important;
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
  border: none;
}

.hero-image img,
.md-content .hero-image img,
.md-typeset .hero-image img {
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.image-caption {
  text-align: center;
  font-style: italic;
  color: var(--text-faint, rgba(255,255,255,0.4));
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.image-container-sm img {
  max-height: 300px;
}

.image-row {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  align-items: flex-start;
  margin: var(--spacing-md) 0;
}

.image-row img {
  max-width: 45%;
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
}

@media (max-width: 600px) {
  .image-row { gap: var(--spacing-xs, 0.5rem); }
  .image-row img,
  .image-row.hero-image img {
    max-width: 48%;
    max-height: 250px;
  }
}

.image-grid-item {
  text-align: center;
}

.image-grid-item img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base);
}

.image-grid-item:hover img {
  transform: scale(1.03);
}

.image-grid-item a {
  display: block;
  margin-top: var(--spacing-xs);
  font-style: italic;
  text-decoration: none;
  transition: opacity var(--transition-base);
}

.image-grid-item a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* PCB modules layout */
.pcb-modules-layout {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) auto;
  justify-items: center;
  max-width: 1200px;
}

.pcb-modules-layout .image-grid-item img {
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base);
}

.pcb-modules-layout .image-grid-item:hover img { transform: scale(1.03); }

.pcb-modules-layout .backplate-item {
  grid-column: 4;
  grid-row: 1 / 3;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.pcb-modules-layout .backplate-item img {
  width: 100%;
  max-width: 200px;
  max-height: 400px;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: contain;
}

@media (max-width: 1024px) {
  .pcb-modules-layout {
    grid-template-columns: repeat(3, 1fr) auto;
    gap: var(--spacing-sm);
  }
  .pcb-modules-layout .image-grid-item img { max-width: 150px; }
  .pcb-modules-layout .backplate-item img { max-width: 120px; max-height: 320px; }
}

@media (max-width: 768px) {
  .pcb-modules-layout .image-grid-item img { max-width: 120px; }
  .pcb-modules-layout .backplate-item img { max-width: 100px; max-height: 280px; }
}

@media (max-width: 480px) {
  .pcb-modules-layout { gap: 0.25rem; }
  .pcb-modules-layout .image-grid-item img { max-width: 80px; }
  .pcb-modules-layout .backplate-item img { max-width: 60px; max-height: 180px; }
}

/* Responsive video */
.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin: var(--spacing-xl) 0;
  border-radius: var(--radius-md);
}

.video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
}

.video-embed.spotify {
  padding-bottom: 0;
  height: 352px;
}


/* ============================================================================
   Card Components
   ============================================================================ */

.test-card,
a.test-card,
.md-typeset a.test-card {
  background: var(--surface, rgba(255,255,255,0.03));
  border: 1px solid var(--border, rgba(255,255,255,0.1));
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  transition: border-color 0.2s, background 0.2s, transform 0.2s, box-shadow 0.2s;
  text-decoration: none !important;
  display: block;
}

.test-card:hover {
  border-color: var(--border-lt, rgba(255,255,255,0.2));
  background: var(--surface-2, rgba(255,255,255,0.06));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.test-card img {
  width: 100%;
  height: var(--img-thumbnail-height);
  max-height: var(--img-thumbnail-height);
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.test-card h3 {
  color: var(--text, #fff);
  margin-bottom: 0.25rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.test-card p {
  color: var(--text-dim, rgba(255,255,255,0.55));
  font-size: 0.8rem;
  margin-bottom: 0;
}


/* ============================================================================
   Grid Layouts
   ============================================================================ */

.test-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap-md);
  margin: var(--spacing-xl) 0;
}

@media (max-width: 1024px) { .test-gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .test-gallery { grid-template-columns: 1fr; } }


/* ============================================================================
   Hero Section Components
   ============================================================================ */

.hero-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0 var(--spacing-2xl) 0;
  flex-wrap: wrap;
}

.hero-section img,
.hero-section video {
  flex: 1;
  min-width: 300px;
  max-width: 500px;
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.hero-section .hero-text {
  flex: 1;
  min-width: 300px;
  font-size: 1.05rem;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .hero-section { flex-direction: column; }
  .hero-section img,
  .hero-section video { max-width: 100%; }
}


/* ============================================================================
   Blog Section (Homepage)
   ============================================================================ */

.blog-section {
  text-align: center;
  padding: 0 28px 48px;
  max-width: 1100px;
  margin: 0 auto;
}

.blog-section h2 {
  font-size: 1.2rem;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  color: var(--text, #e2e8f0);
  margin-bottom: 0.25rem;
}

.section-subtitle {
  color: var(--text-faint, rgba(255,255,255,0.4));
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.blog-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
}

.blog-preview-card,
.md-typeset a.blog-preview-card {
  background: var(--surface, rgba(255,255,255,0.03));
  border: 1px solid var(--border, rgba(255,255,255,0.08));
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  text-align: left;
  text-decoration: none !important;
  color: inherit;
  transition: border-color 0.2s, background 0.2s, transform 0.2s, box-shadow 0.2s;
}

.blog-preview-card:hover,
.md-typeset a.blog-preview-card:hover {
  border-color: var(--border-lt, rgba(255,255,255,0.18));
  background: var(--surface-2, rgba(255,255,255,0.05));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.blog-date {
  font-size: 0.72rem;
  color: var(--text-faint, rgba(255,255,255,0.4));
  font-family: 'JetBrains Mono', monospace;
  display: block;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.blog-preview-card h3 {
  font-size: 0.95rem;
  color: var(--text, #e2e8f0);
  margin: 0 0 0.5rem;
  font-weight: 500;
}

.blog-preview-card p {
  font-size: 0.82rem;
  color: var(--text-dim, rgba(255,255,255,0.5));
  margin: 0;
  line-height: 1.5;
}


/* ============================================================================
   Theme Overrides
   ============================================================================ */

.md-post--excerpt {
  border-radius: var(--radius-md);
}