/* 
 * CloudResearch.online - Professional CSS
 * Clean, modern design with white background and blue/purple accents
 * Enterprise-tech aesthetic
 */

:root {
  /* Color Palette */
  --color-primary: #0052cc;
  --color-primary-dark: #003d99;
  --color-primary-light: #e8f0ff;
  --color-accent: #6f42c1;
  --color-accent-light: #f0e8ff;
  --color-background: #ffffff;
  --color-surface: #f8f9fa;
  --color-card: rgba(255, 255, 255, 0.92);
  --color-card-border: rgba(0, 82, 204, 0.18);
  --color-callout: rgba(0, 82, 204, 0.06);
  --color-callout-border: rgba(0, 82, 204, 0.22);
  --color-border: #e0e0e0;
  --color-text: #1a1a1a;
  --color-text-secondary: #636363;
  --color-text-tertiary: #999999;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-family-mono: "Menlo", "Monaco", "Courier New", monospace;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-normal: 1.5;
  --line-height-heading: 1.2;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  background-image: radial-gradient(circle at 20% 10%, rgba(0, 82, 204, 0.08), transparent 55%),
                    radial-gradient(circle at 80% 85%, rgba(111, 66, 193, 0.06), transparent 55%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100%;
  box-sizing: border-box;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: var(--line-height-heading);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: 1.25rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

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

p + p {
  margin-top: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

strong,
b {
  font-weight: var(--font-weight-semibold);
}

em,
i {
  font-style: italic;
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  background-color: var(--color-surface);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

pre {
  background-color: #f5f5f5;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin-left: 0;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  font-style: italic;
}

/* ============================================================================
   LISTS
   ============================================================================ */

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

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

/* ============================================================================
   TABLES
   ============================================================================ */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
  font-size: 0.95em;
}

table th {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: var(--spacing-sm);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

table td {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm);
}

table tr:hover {
  background-color: var(--color-primary-light);
}

/* ============================================================================
   CONTAINER & LAYOUT
   ============================================================================ */

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* ============================================================================
   HEADER & NAVIGATION
   ============================================================================ */

header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  text-decoration: none;
}

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

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-lg);
  margin: 0;
}

nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

nav a.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.hero {
  background: linear-gradient(135deg, #ffffff 0%, #f0e8ff 50%, #e8f0ff 100%);
  padding: var(--spacing-2xl) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 80%, rgba(0, 82, 204, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(111, 66, 193, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  font-weight: 800;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.6;
}

/* ============================================================================
   CARDS & BOXES
   ============================================================================ */

.card {
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(0, 82, 204, 0.02) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
}

.highlight-box {
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.info-box {
  background-color: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.callout {
  background-color: var(--color-callout);
  border-left: 4px solid var(--color-callout-border);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.callout strong {
  color: var(--color-primary);
}

blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-lg);
  background-color: var(--color-callout);
  border-left: 4px solid var(--color-primary);
  color: var(--color-text-secondary);
  font-style: italic;
  border-radius: var(--radius-md);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, #002266 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: #e8e8e8;
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, #5a32a3 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #5a32a3 0%, #4a2680 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* ============================================================================
   POST LIST
   ============================================================================ */

.post-list {
  list-style: none;
}

.post-item {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-item:last-child {
  border-bottom: none;
}

.post-item h3 {
  margin-top: 0;
}

.post-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
}

.post-summary {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
}

.tag {
  display: inline-block;
  background-color: var(--color-surface);
  color: var(--color-text);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  text-decoration: none;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.tag:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tag-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ============================================================================
   FEATURED SECTION
   ============================================================================ */

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.featured-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.featured-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.featured-card h4 {
  color: var(--color-primary);
  margin-top: 0;
}

/* ============================================================================
   VALUE PROPOSITION
   ============================================================================ */

.value-props {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.value-prop {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
}

.value-prop h4 {
  color: var(--color-primary);
  margin-top: 0;
}

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

footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.footer-section h5 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.footer-section ul {
  list-style: none;
  margin: 0;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* ============================================================================
   BLOG POST STYLING
   ============================================================================ */

article {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin: 0 0 var(--spacing-lg);
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

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

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.article-actions {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.article-actions p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.insights-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.faq-section {
  margin-top: var(--spacing-2xl);
}

.faq-list {
  display: grid;
  gap: var(--spacing-sm);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--spacing-sm) var(--spacing-md);
}

.faq-item summary {
  cursor: pointer;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.faq-item p {
  margin: var(--spacing-sm) 0 0;
  color: var(--color-text-secondary);
}

.article-toc {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.article-toc h3 {
  margin-top: 0;
  font-size: 1rem;
}

.article-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.article-toc li {
  margin-bottom: var(--spacing-xs);
}

.article-toc a {
  font-size: 0.9rem;
}

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

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  nav ul {
    gap: var(--spacing-md);
    font-size: 0.9rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .featured-grid,
  .value-props {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.85em;
  }

  table th,
  table td {
    padding: var(--spacing-xs);
  }

  .insights-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
  }

  main {
    padding: var(--spacing-lg) 0;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .btn {
    display: block;
    text-align: center;
  }
}

/* ============================================================================
   UTILITIES
   ============================================================================ */

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

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--color-text-tertiary);
}

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

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

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

.p-lg {
  padding: var(--spacing-lg);
}

.hidden {
  display: none;
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
  header,
  footer,
  nav {
    display: none;
  }

  body {
    background-color: white;
  }

  a {
    text-decoration: underline;
  }
}

/* ============================================================================
   SINGLE PAGE LAYOUT FIXES
   ============================================================================ */

/* Hide table of contents on single pages to prevent multi-column layout */
.toc {
  display: none !important;
}

/* Ensure single pages are single column, centered */
.page.single {
  max-width: 800px;
  margin: 0 auto;
  display: block;
  column-count: 1;
}

/* Style horizontal rules as section separators */
.page.single hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: 2rem 0;
}