/* KBsolves Shared Design System — Light Theme */
/* Used by: Blog posts, Guides, Resource pages */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&family=Caveat:wght@400;700&display=swap');

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

:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #f1f5f9;
  --color-text: #334155;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-heading: #0f172a;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: rgba(59, 130, 246, 0.08);
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --gradient-primary: linear-gradient(135deg, #3b82f6, #06b6d4);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  --font-handwritten: 'Caveat', cursive;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 20px rgba(59,130,246,0.2);
  --max-width: 1200px;
  --max-width-narrow: 760px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; margin-bottom: 1.5rem; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; margin-top: 2.5rem; margin-bottom: 1rem; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 600; margin-top: 2rem; margin-bottom: 0.75rem; }

p { margin-bottom: 1.25rem; }
strong { color: var(--color-heading); font-weight: 600; }

a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }

/* Layout */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: var(--max-width-narrow); margin: 0 auto; padding: 0 1.5rem; }

.page-header {
  padding: 6rem 0 3rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-header .subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

.page-header .meta {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

.page-content {
  padding: 3rem 0 6rem;
}

/* Article body — optimized for readability */
.article-body {
  font-size: 1.075rem;
  line-height: 1.85;
}
.article-body h2 { margin-top: 3rem; }
.article-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.breadcrumbs a { color: var(--color-text-secondary); text-decoration: none; }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs span { margin: 0 0.5rem; }

/* Cards */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.2s ease;
}
.card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* Blog card */
.blog-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: block;
  color: inherit;
}
.blog-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  transform: translateY(-2px);
}
.blog-card h3 { margin-top: 0; color: var(--color-heading); }
.blog-card p { color: var(--color-text-secondary); font-size: 0.95rem; margin-bottom: 0; }
.blog-card .tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

/* Key Takeaways Box (AIO) */
.key-takeaways {
  background: var(--color-primary-light);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 2rem 0;
}
.key-takeaways h3 {
  color: var(--color-primary);
  margin-top: 0;
  font-size: 1.05rem;
  margin-bottom: 1rem;
}
.key-takeaways ul { padding-left: 1.25rem; }
.key-takeaways li { margin-bottom: 0.5rem; }

/* FAQ */
.faq-list { margin: 2rem 0; }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}
.faq-item dt {
  font-weight: 600;
  color: var(--color-heading);
  font-size: 1.05rem;
}
.faq-item dt::after { content: ' +'; color: var(--color-primary); }
.faq-item dd {
  color: var(--color-text-secondary);
  margin-top: 0.75rem;
  line-height: 1.8;
}

/* Tables */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}
.comparison-table th {
  background: var(--color-bg-secondary);
  color: var(--color-heading);
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-primary);
}
.comparison-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
}
.comparison-table tr:hover td { background: var(--color-primary-light); }
.comparison-table .check { color: var(--color-success); font-weight: 700; }
.comparison-table .cross { color: var(--color-error); }
.comparison-table .highlight-row td { background: var(--color-primary-light); }

/* CTA Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(59,130,246,0.3); color: white; text-decoration: none; }
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-secondary:hover { background: var(--color-primary-light); text-decoration: none; }

.cta-section {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  margin: 3rem 0;
}
.cta-section h2 { margin-top: 0; }

/* Stat callout */
.stat-callout {
  display: inline-block;
  background: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
  padding: 0.75rem 1.25rem;
  margin: 1rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-weight: 500;
  color: var(--color-heading);
}

/* Lists */
ul, ol { padding-left: 1.5rem; margin-bottom: 1.25rem; }
li { margin-bottom: 0.5rem; }
ul.feature-list { list-style: none; padding: 0; }
ul.feature-list li { padding: 0.75rem 0; border-bottom: 1px solid var(--color-border); }
ul.feature-list li::before { content: '→ '; color: var(--color-primary); font-weight: 700; }

/* Table of Contents */
.toc {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}
.toc h3 { margin-top: 0; font-size: 1rem; }
.toc ol { margin-bottom: 0; }
.toc li { margin-bottom: 0.35rem; font-size: 0.95rem; }
.toc a { text-decoration: none; }

/* Animations — matching main SPA */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes shimmer {
  from { background-position: -1000px 0; }
  to { background-position: 1000px 0; }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Staggered delay helpers */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Glass card (light theme variant) */
.glass-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.15);
  border-color: var(--color-primary);
}

/* Float animation for decorative elements */
.animate-float { animation: float 3s ease-in-out infinite; }

/* Enhanced hover lifts (matching SPA card interactions) */
.card:hover, .blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.15);
}

/* Gradient text effect */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glow effect for CTAs */
.btn-primary {
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}
.btn-primary:hover::after {
  transform: translateX(100%);
}

/* Responsive */
@media (max-width: 768px) {
  .page-header { padding: 4rem 0 2rem; }
  .page-content { padding: 2rem 0 4rem; }
  .card-grid { grid-template-columns: 1fr; }
  .comparison-table { font-size: 0.85rem; }
  .comparison-table th, .comparison-table td { padding: 0.75rem 0.5rem; }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-scale { opacity: 1; transform: none; transition: none; }
  .animate-float { animation: none; }
  .btn-primary::after { display: none; }
}