/* ==========================================================================
   DevToolAdda — Shared & Cached SEO & Layout Stylesheet (/seo-styles.css)
   Browser Cacheable: public, max-age=31536000, immutable
   Shrinks pre-rendered HTML payloads by 60%+ across all 150+ website URLs.
   ========================================================================== */

/* 1. Base Reset & Font Tokens */
:root {
  --seo-bg: #0a0a0a;
  --seo-card-bg: #161616;
  --seo-card-subtle: #0f0f0f;
  --seo-border: rgba(255, 255, 255, 0.08);
  --seo-border-hover: rgba(99, 102, 241, 0.35);
  --seo-text-main: #f3f4f6;
  --seo-text-muted: #9ca3af;
  --seo-text-dim: #6b7280;
  --seo-primary: #6366f1;
  --seo-primary-hover: #4f46e5;
  --seo-primary-light: #818cf8;
  --seo-primary-glow: rgba(99, 102, 241, 0.12);
  --seo-radius-sm: 0.5rem;
  --seo-radius-md: 0.75rem;
  --seo-radius-lg: 1rem;
  --seo-radius-xl: 1.25rem;
  --seo-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --seo-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* 2. Global Containers & Layout */
.seo-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  font-family: var(--seo-font-sans);
  color: var(--seo-text-main);
  box-sizing: border-box;
}

.seo-container-narrow {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  font-family: var(--seo-font-sans);
  color: var(--seo-text-main);
  box-sizing: border-box;
}

.seo-container-reading {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  font-family: var(--seo-font-sans);
  color: var(--seo-text-main);
  box-sizing: border-box;
}

.seo-container-center {
  text-align: center;
}

/* 3. Navigation & Breadcrumbs */
.seo-breadcrumbs {
  font-size: 0.875rem;
  color: var(--seo-text-muted);
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  line-height: 1.4;
}

.seo-crumb-link {
  color: var(--seo-text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

.seo-crumb-link:hover {
  color: var(--seo-primary-light);
}

.seo-crumb-sep {
  color: var(--seo-text-dim);
  user-select: none;
}

.seo-crumb-current {
  color: var(--seo-text-main);
  font-weight: 500;
}

/* 4. Page Header & Typography */
.seo-header {
  margin-bottom: 2.5rem;
}

.seo-header-center {
  margin: 0 auto 3rem auto;
  max-width: 850px;
  text-align: center;
}

.seo-h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  margin: 0 0 0.85rem 0;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.seo-h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  margin: 1.5rem 0 0.75rem 0;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

.seo-h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #ffffff;
  margin: 0 0 0.5rem 0;
  line-height: 1.4;
}

.seo-desc {
  font-size: 1.125rem;
  color: var(--seo-text-muted);
  line-height: 1.65;
  margin: 0 0 1.25rem 0;
  max-width: 800px;
}

.seo-desc-center {
  margin-left: auto;
  margin-right: auto;
}

.seo-p {
  color: var(--seo-text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.seo-p-lead {
  font-size: 1.125rem;
  color: #e5e7eb;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

/* 5. Badges & Tags */
.seo-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--seo-radius-sm);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.seo-badge-primary {
  color: var(--seo-primary-light);
  background: var(--seo-primary-glow);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.seo-badge-green {
  color: #34d399;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.seo-badge-amber {
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

/* 6. Grids & Lists */
.seo-grid-tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.seo-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.seo-grid-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.seo-stack-vertical {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* 7. Cards & Containers */
.seo-card {
  background: var(--seo-card-bg);
  border: 1px solid var(--seo-border);
  border-radius: var(--seo-radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
  box-sizing: border-box;
}

.seo-card-tool {
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.seo-card-article {
  padding: 1.5rem;
  border-radius: var(--seo-radius-lg);
}

.seo-card-faq {
  background: var(--seo-card-subtle);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--seo-radius-md);
  padding: 1.25rem 1.5rem;
}

.seo-article-block {
  background: var(--seo-card-bg);
  border: 1px solid var(--seo-border);
  border-radius: var(--seo-radius-xl);
  padding: 2.25rem 2rem;
  line-height: 1.75;
  color: #d1d5db;
  margin-bottom: 2.5rem;
}

/* 8. Links & Buttons */
.seo-card-link {
  color: var(--seo-primary-light);
  font-weight: 600;
  text-decoration: none;
  font-size: 1.05rem;
  display: inline-block;
  margin-bottom: 0.35rem;
  transition: color 0.15s ease;
}

.seo-card-link:hover {
  color: #a5b4fc;
  text-decoration: underline;
}

.seo-card-subtext {
  color: var(--seo-text-muted);
  font-size: 0.8125rem;
  margin: 0;
  line-height: 1.5;
}

.seo-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--seo-primary);
  color: #ffffff !important;
  padding: 0.75rem 1.5rem;
  border-radius: var(--seo-radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 4px 14px -2px rgba(99, 102, 241, 0.4);
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.seo-btn-primary:hover {
  background: var(--seo-primary-hover);
  transform: translateY(-1px);
}

.seo-btn-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.seo-btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.seo-badge-title {
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.seo-feature-title {
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.seo-use-case-title {
  color: #38bdf8;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.seo-how-to-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  padding: 0;
  list-style: none;
  margin: 0 0 2rem 0;
}

.seo-best-practice-item {
  display: flex;
  gap: 0.75rem;
}

.seo-code-snippet {
  font-family: var(--seo-font-mono);
  font-size: 0.8rem;
  color: var(--seo-primary-light);
  word-break: break-all;
  display: block;
}

.seo-cheat-item-title {
  font-weight: 600;
  color: #e5e7eb;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.seo-card-sm {
  padding: 0.75rem;
}

.seo-mb-1 { margin-bottom: 0.5rem; }
.seo-mb-2 { margin-bottom: 1rem; }
.seo-mb-3 { margin-bottom: 1.25rem; }
.seo-mb-4 { margin-bottom: 1.5rem; }
.seo-mt-0 { margin-top: 0; }

.seo-section-title {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

/* 9. Section Dividers & Footers */
.seo-divider {
  margin-top: 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
}

/* 10. 404 Error State */
.seo-404-code {
  font-size: 4rem;
  font-weight: 900;
  color: var(--seo-primary-light);
  display: block;
  margin-bottom: 0.5rem;
  line-height: 1;
}

/* 11. Responsive Styles */
@media (max-width: 768px) {
  .seo-container,
  .seo-container-narrow,
  .seo-container-reading {
    padding: 1.75rem 1rem;
  }
  
  .seo-h1 {
    font-size: 1.75rem;
  }
  
  .seo-h2 {
    font-size: 1.35rem;
  }
  
  .seo-desc {
    font-size: 1rem;
  }

  .seo-grid-tools {
    grid-template-columns: 1fr;
  }

  .seo-grid-cards {
    grid-template-columns: 1fr;
  }
  
  .seo-article-block {
    padding: 1.5rem 1.15rem;
    border-radius: var(--seo-radius-lg);
  }
}