* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --transition-speed: 0.3s;
}

html,
body {
  height: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-primary, #111827);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

body.theme-loading {
  opacity: 0;
}

body.theme-loaded {
  opacity: 1;
  transition: opacity 0.4s ease;
}

#app {
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.2rem;
  background: color-mix(in srgb, var(--card-bg, #fff) 85%, transparent);
  border-bottom: 1px solid var(--card-border, rgba(0, 0, 0, 0.1));
  backdrop-filter: blur(12px);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.topbar h1 {
  font-size: 1.05rem;
}

.topbar p {
  font-size: 0.78rem;
  opacity: 0.75;
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status-badge,
.articles-count,
.theme-name {
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-primary, #3b82f6) 12%, transparent);
}

.theme-toggle {
  border: 1px solid var(--card-border, rgba(0, 0, 0, 0.2));
  background: color-mix(in srgb, var(--card-bg, #fff) 80%, transparent);
  color: inherit;
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: color-mix(in srgb, var(--accent-primary, #3b82f6) 16%, transparent);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.status-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6);
  animation: pulse 1.6s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6); }
  100% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
}

.content {
  min-height: 0;
}

.articles-grid {
  min-height: calc(100vh - 120px);
  overflow-y: auto;
}

.articles-grid.has-reel-feed {
  scroll-snap-type: y mandatory;
}

.reel-article {
  min-height: calc(100vh - 120px);
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.reel-shell {
  width: min(920px, 100%);
  max-height: calc(100vh - 170px);
  overflow: auto;
  background: var(--card-bg, rgba(255, 255, 255, 0.86));
  border: 1px solid var(--card-border, rgba(0, 0, 0, 0.08));
  border-radius: 24px;
  padding: 1.4rem;
  /* 3D shadow effects for depth */
  box-shadow: 
    0 1px 2px rgba(0, 0, 0, 0.05),
    0 4px 8px rgba(0, 0, 0, 0.1),
    0 12px 24px rgba(0, 0, 0, 0.15),
    0 24px 48px var(--shadow-color, rgba(15, 23, 42, 0.2));
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  /* Custom scrollbar styling */
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
  scrollbar-gutter: stable both-edges;
}

.reel-shell:hover {
  box-shadow: 
    0 2px 4px rgba(0, 0, 0, 0.08),
    0 8px 16px rgba(0, 0, 0, 0.12),
    0 16px 32px rgba(0, 0, 0, 0.18),
    0 32px 64px var(--shadow-color, rgba(15, 23, 42, 0.25));
  transform: translateY(-2px);
  scrollbar-color: rgba(0, 0, 0, 0.3) rgba(0, 0, 0, 0.05);
}

/* Webkit scrollbar styling (Chrome, Safari, Edge) */
.reel-shell::-webkit-scrollbar {
  width: 10px;
}

.reel-shell::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 10px;
  margin: 8px 0;
}

.reel-shell::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.4));
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
  box-shadow: 
    0 1px 2px rgba(0, 0, 0, 0.1),
    0 2px 4px rgba(0, 0, 0, 0.15);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.reel-shell::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.5));
  background-clip: padding-box;
  box-shadow: 
    0 2px 4px rgba(0, 0, 0, 0.2),
    0 4px 8px rgba(0, 0, 0, 0.25);
}

.reel-shell::-webkit-scrollbar-thumb:active {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.6));
  background-clip: padding-box;
}

.reel-article.is-latest .reel-shell {
  border-color: color-mix(in srgb, var(--accent-primary, #3b82f6) 55%, transparent);
}

.reel-meta {
  display: flex;
  gap: 0.55rem;
  font-size: 0.78rem;
  opacity: 0.8;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.latest-pill {
  background: var(--accent-primary, #3b82f6);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-weight: 700;
}

.reel-title {
  font-size: clamp(1.4rem, 3.2vw, 2.4rem);
  line-height: 1.15;
  margin-bottom: 0.8rem;
}

.reel-excerpt {
  opacity: 0.8;
  margin-bottom: 1rem;
}

.reel-content {
  line-height: 1.75;
}

.reel-content h1,
.reel-content h2,
.reel-content h3 {
  margin: 1.2rem 0 0.8rem;
}

.reel-content p {
  margin: 0.65rem 0;
}

.reel-content code {
  background: color-mix(in srgb, var(--text-primary, #000) 8%, transparent);
  border-radius: 5px;
  padding: 0.05rem 0.35rem;
}

.reel-content a {
  color: var(--accent-primary, #3b82f6);
}

.loading-state,
.empty-state {
  min-height: calc(100vh - 120px);
  display: grid;
  place-items: center;
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(125, 125, 125, 0.25);
  border-top-color: var(--accent-primary, #3b82f6);
  border-radius: 50%;
  margin: 0 auto 0.8rem;
  animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.footer {
  text-align: center;
  font-size: 0.8rem;
  padding: 0.75rem;
  border-top: 1px solid var(--card-border, rgba(0, 0, 0, 0.08));
}

.footer a {
  color: inherit;
  text-decoration: none;
}

.separator {
  opacity: 0.5;
  margin: 0 0.3rem;
}

#index-circle {
  position: fixed;
  right: 1.2rem;
  bottom: 1.1rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-primary, #3b82f6), var(--accent-secondary, #8b5cf6));
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  z-index: 30;
}

.featured-article-full {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 2.5rem 4rem;
  line-height: 1.8;
  background: transparent;
  box-shadow: none;
  border: none;
  display: block;
  min-height: auto;
}

.featured-article-full .article-content-featured {
  display: block;
  visibility: visible;
  opacity: 1;
  /* 3D shadow effects for depth */
  box-shadow: 
    0 1px 2px rgba(0, 0, 0, 0.05),
    0 4px 8px rgba(0, 0, 0, 0.1),
    0 12px 24px rgba(0, 0, 0, 0.15),
    0 24px 48px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.featured-article-full .article-content-featured:hover {
  box-shadow: 
    0 2px 4px rgba(0, 0, 0, 0.08),
    0 8px 16px rgba(0, 0, 0, 0.12),
    0 16px 32px rgba(0, 0, 0, 0.18),
    0 32px 64px rgba(0, 0, 0, 0.25);
  transform: translateY(-2px);
}

.article-header-featured {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--card-border, rgba(0, 0, 0, 0.08));
}

.article-header-featured .badges {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.badge-new,
.badge-theme {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: color-mix(in srgb, var(--accent-primary, #3b82f6) 20%, transparent);
  color: var(--accent-primary, #3b82f6);
}

.badge-theme {
  background: color-mix(in srgb, var(--text-primary, #000) 10%, transparent);
  color: var(--text-primary, #000);
}

.article-title-featured {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary, #111827);
}

.article-meta-featured {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
  opacity: 0.8;
  flex-wrap: wrap;
}

.article-content-featured {
  margin: 1.5rem 0;
  font-size: 1.15rem;
  background: var(--card-bg, rgba(255, 255, 255, 0.95));
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--card-border, rgba(0, 0, 0, 0.08));
  box-shadow: 0 8px 32px var(--shadow-color, rgba(15, 23, 42, 0.08));
  /* Custom scrollbar styling */
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
  scrollbar-gutter: stable both-edges;
}

.article-content-featured:hover {
  scrollbar-color: rgba(0, 0, 0, 0.3) rgba(0, 0, 0, 0.05);
}

/* Webkit scrollbar for featured article */
.article-content-featured::-webkit-scrollbar {
  width: 10px;
}

.article-content-featured::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 10px;
  margin: 8px 0;
}

.article-content-featured::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.4));
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
  box-shadow: 
    0 1px 2px rgba(0, 0, 0, 0.1),
    0 2px 4px rgba(0, 0, 0, 0.15);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.article-content-featured::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.5));
  background-clip: padding-box;
  box-shadow: 
    0 2px 4px rgba(0, 0, 0, 0.2),
    0 4px 8px rgba(0, 0, 0, 0.25);
}

.article-content-featured h1,
.article-content-featured h2,
.article-content-featured h3,
.article-content-featured h4 {
  margin: 2rem 0 1rem;
  line-height: 1.3;
}

.article-content-featured h1 {
  font-size: 2.2rem;
  margin-top: 0;
}

.article-content-featured h2 {
  font-size: 1.8rem;
}

.article-content-featured h3 {
  font-size: 1.5rem;
}

.article-content-featured p {
  margin: 1.4rem 0;
  opacity: 0.95;
  line-height: 1.85;
}

.article-content-featured ul,
.article-content-featured ol {
  margin: 1.2rem 0;
  padding-left: 2rem;
}

.article-content-featured li {
  margin: 0.5rem 0;
}

.article-content-featured code {
  background: color-mix(in srgb, var(--text-primary, #000) 8%, transparent);
  border-radius: 5px;
  padding: 0.1rem 0.4rem;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
}

.article-content-featured pre {
  background: color-mix(in srgb, var(--text-primary, #000) 8%, transparent);
  border-radius: 8px;
  padding: 1.2rem;
  overflow-x: auto;
  margin: 1.2rem 0;
}

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

.article-content-featured a {
  color: var(--accent-primary, #3b82f6);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-primary, #3b82f6);
}

.article-content-featured a:hover {
  opacity: 0.8;
}

.articles-separator {
  text-align: center;
  padding: 2rem;
  margin: 2rem 0;
  font-size: 0.9rem;
  opacity: 0.6;
  border-top: 1px solid var(--card-border, rgba(0, 0, 0, 0.1));
}

.articles-separator span {
  background: var(--card-bg, #fff);
  padding: 0 0.5rem;
  display: inline-block;
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .articles-grid,
  .reel-article {
    height: auto;
    min-height: calc(100vh - 170px);
  }

  .reel-shell {
    max-height: none;
  }

  .featured-article-full {
    padding: 2rem 1rem;
  }

  .article-title-featured {
    font-size: 1.6rem;
  }

  .article-content-featured {
    font-size: 0.95rem;
  }
}