/* ===== CSS Variables ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --header-height: 70px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

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

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-sm);
}

ul, ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
}

/* ===== Layout ===== */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: 800px;
}

/* ===== Header & Navigation ===== */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-image {
  height: 40px;
  width: auto;
  min-width: 240px;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo:hover .logo-text {
  color: var(--color-primary);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

/* Navigation */
.main-nav .nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
  padding: 0;
}

.nav-item a {
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
  padding: var(--spacing-xs) 0;
  display: inline-block;
  position: relative;
}

.nav-item a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.2s ease;
}

.nav-item a:hover::after,
.nav-item.active a::after {
  width: 100%;
}

.nav-item.active a {
  color: var(--color-primary);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.hero-tagline {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Content Sections ===== */
.home-content,
.content-page,
.list-page,
.featured-section {
  padding: var(--spacing-2xl) 0;
}

.page-header {
  margin-bottom: var(--spacing-xl);
}

.page-header h1 {
  margin-bottom: var(--spacing-xs);
}

.subtitle,
.description {
  font-size: 1.25rem;
  color: var(--color-text-light);
}

.featured-section {
  background: var(--color-bg-alt);
}

.section-footer {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-lg);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-lg);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.card h2,
.card h3 {
  margin-bottom: var(--spacing-xs);
}

.card h2 a,
.card h3 a {
  color: var(--color-text);
}

.card h2 a:hover,
.card h3 a:hover {
  color: var(--color-primary);
}

.card p {
  color: var(--color-text-light);
}

.read-more {
  display: inline-block;
  margin-top: var(--spacing-sm);
  font-weight: 500;
}

/* Single-column stacked list of cards */
.card-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.card p:last-child {
  margin-bottom: 0;
}

/* ===== News Cards (Email Security News) ===== */
.news-grid {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: var(--spacing-lg);
}

.news-item {
  display: flex;
  min-width: 0;
}

.news-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 0;
  overflow: hidden;
}

.news-card-image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.news-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--spacing-md);
}

.card .news-card-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.news-card-source {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.card .news-card-title {
  font-size: 1.25rem;
  line-height: 1.35;
}

.news-card-title a {
  overflow-wrap: break-word;
}

.news-empty {
  color: var(--color-text-light);
}

/* ===== News Section ===== */
.article-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: var(--spacing-xl);
}

.article-list > li + li {
  border-top: 1px solid var(--color-border);
}

.article-summary {
  padding: var(--spacing-lg) 0;
}

.article-summary-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.article-summary-title a {
  color: var(--color-text);
}

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

.article-meta {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.article-summary-text {
  color: var(--color-text-light);
  margin-bottom: 0;
}

.back-link,
.feed-link {
  margin-top: var(--spacing-xl);
  margin-bottom: 0;
}

/* ===== Multi-Column Layouts ===== */
.columns {
  display: grid;
  gap: var(--spacing-lg);
}

.columns-2 {
  grid-template-columns: repeat(1, 1fr);
}

.columns-3 {
  grid-template-columns: repeat(1, 1fr);
}

.columns-4 {
  grid-template-columns: repeat(1, 1fr);
}

.column {
  min-width: 0;
}

/* Content columns shortcode support */
.row {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.row.two-columns {
  grid-template-columns: 1fr;
}

.row.three-columns {
  grid-template-columns: 1fr;
}

.col {
  min-width: 0;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-text);
  color: white;
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
  margin-bottom: var(--spacing-sm);
  color: white;
}

.footer-col p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col li {
  margin-bottom: var(--spacing-xs);
}

.footer-col a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-col a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

/* ===== Responsive Breakpoints ===== */

/* Tablet (768px+) */
@media (min-width: 768px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2.25rem; }
  
  .hero h1 {
    font-size: 3.5rem;
  }
  
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Single card should span full width */
  .card-grid .card:only-child {
    grid-column: 1 / -1;
  }
  
  .columns-2,
  .row.two-columns {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .columns-3,
  .row.three-columns {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .card-grid.columns-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .columns-3,
  .row.three-columns {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .columns-4 {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* Mobile Navigation */
@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }
  
  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .main-nav.is-open {
    display: block;
  }
  
  .main-nav .nav-list {
    flex-direction: column;
    gap: 0;
  }
  
  .nav-item {
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-item:last-child {
    border-bottom: none;
  }
  
  .nav-item a {
    display: block;
    padding: var(--spacing-sm) 0;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-tagline {
    font-size: 1rem;
  }
}

/* ===== Testimonial Images ===== */
.testimonial-image {
  margin: var(--spacing-lg) 0;
  max-width: 640px;
}

.testimonial-image img {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.testimonial-image figcaption {
  margin-top: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--color-text-light);
  font-style: italic;
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }