/* ============================================
   BLOG DIGITALEFUTURO - STYLE.CSS
   ============================================ */

/* CSS Variables */
:root {
  --color-primary: #8b5cf6;
  --color-primary-dark: #7c3aed;
  --color-secondary: #3b82f6;
  --color-background: #0a0f1e;
  --color-surface: #1a1f35;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: rgba(139, 92, 246, 0.2);
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
  
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.3);
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   BLOG HEADER
   ============================================ */

.blog-header {
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link img {
  transition: transform 0.3s ease;
}

.logo-link:hover img {
  transform: scale(1.05);
}

.blog-nav {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  width: 100%;
}

/* ============================================
   BLOG HERO
   ============================================ */

.blog-hero {
  text-align: center;
  padding: var(--space-2xl) 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.05));
  border-bottom: 1px solid var(--color-border);
}

.blog-hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, #8b5cf6, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   ARTICLES GRID
   ============================================ */

.blog-main {
  padding: var(--space-2xl) 0;
  min-height: 60vh;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.article-card {
  background: rgba(26, 31, 53, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
}

.article-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.article-image {
  width: 100%;
  height: 220px;
  overflow: hidden;
}

.article-image-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-icon {
  font-size: 4rem;
}

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

.article-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-title {
  font-size: 1.5rem;
  margin: var(--space-sm) 0;
  line-height: 1.3;
}

.article-title a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.article-title a:hover {
  color: var(--color-primary);
}

.article-excerpt {
  color: var(--color-text-muted);
  margin: var(--space-md) 0;
  line-height: 1.6;
}

.article-tags {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  margin: var(--space-md) 0;
}

.tag {
  background: rgba(139, 92, 246, 0.15);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.read-more {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.3s ease;
}

.read-more:hover {
  transform: translateX(5px);
}

/* ============================================
   ARTICLE PAGE (SINGLE)
   ============================================ */

.article-header {
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.article-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.back-link {
  color: var(--color-text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.3s ease;
}

.back-link:hover {
  color: var(--color-primary);
}

.article-main {
  padding: var(--space-2xl) 0;
}

.article-hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.article-hero h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin: var(--space-md) 0;
}

.article-lead {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.125rem;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 2rem;
  margin: var(--space-xl) 0 var(--space-md);
  color: var(--color-text);
}

.article-body h3 {
  font-size: 1.5rem;
  margin: var(--space-lg) 0 var(--space-md);
  color: var(--color-text);
}

.article-body h4 {
  font-size: 1.25rem;
  margin: var(--space-md) 0 var(--space-sm);
  color: var(--color-primary);
}

.article-body p {
  margin: var(--space-md) 0;
  color: var(--color-text-muted);
}

.article-body ul,
.article-body ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
}

.article-body li {
  margin: var(--space-sm) 0;
  color: var(--color-text-muted);
}

.article-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.article-body a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color 0.3s ease;
}

.article-body a:hover {
  color: var(--color-primary-dark);
}

/* Special Sections */
.checklist,
.content-ideas,
.seo-tips,
.budget-table,
.kpi-section,
.metrics {
  background: rgba(139, 92, 246, 0.05);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  border-radius: var(--radius-md);
}

.article-cta {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(59, 130, 246, 0.15));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  margin: var(--space-2xl) 0;
}

.article-cta h3 {
  font-size: 1.75rem;
  margin-bottom: var(--space-sm);
}

.article-cta p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.cta-button {
  display: inline-block;
  background: linear-gradient(135deg, #8b5cf6, #3b82f6);
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   BLOG CTA SECTION
   ============================================ */

.blog-cta {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.05));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}

.cta-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.cta-content p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  font-size: 1.125rem;
}

.cta-button-large {
  display: inline-block;
  background: linear-gradient(135deg, #8b5cf6, #3b82f6);
  color: white;
  padding: 1.25rem 2.5rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.125rem;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.cta-button-large:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   FOOTER
   ============================================ */

.blog-footer,
.article-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-brand h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, #8b5cf6, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  color: var(--color-text-muted);
}

.footer-links h4 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.footer-links a {
  display: block;
  color: var(--color-text-muted);
  text-decoration: none;
  margin: var(--space-xs) 0;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer-bottom a {
  color: var(--color-primary);
  text-decoration: none;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .blog-hero h1 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .article-hero h1 {
    font-size: 1.75rem;
  }
  
  .article-body {
    font-size: 1rem;
  }
  
  .blog-nav {
    gap: var(--space-md);
  }
  
  .nav-link {
    font-size: 0.875rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}