/* ==========================================================================
   Cimetech Global Design System - Vanilla CSS
   ========================================================================== */

/* 1. Variables & Base System */
:root {
  --color-bg: #f8fafc;
  --color-bg-transparent: rgba(248, 250, 252, 0);
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  
  --color-primary: #0e7490;      /* Cyan 700 for high contrast */
  --color-secondary: #0369a1;    /* Sky 700 */
  --color-accent: #059669;       /* Emerald 600 */
  --color-accent-hover: #047857;
  --color-border: #e2e8f0;       /* Slate 200 */
  --color-header-bg: rgba(255, 255, 255, 0.85);
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', sans-serif;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(14, 116, 144, 0.1);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
}

[data-theme="dark"] {
  --color-bg: #0b0f19;
  --color-bg-transparent: rgba(11, 15, 25, 0);
  --color-surface: #131a26;
  --color-surface-hover: #1b2536;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  
  --color-primary: #06b6d4;      /* Vibrant Cyan */
  --color-secondary: #0d9488;    /* Teal */
  --color-accent: #10b981;       /* Emerald Green */
  --color-accent-hover: #059669;
  --color-border: #1e293b;
  --color-header-bg: rgba(11, 15, 25, 0.85);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 2. Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text-primary);
}

p {
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-secondary);
}

/* 3. Header & Navigation (Glassmorphism) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
}

.logo-img {
  height: 38px;
  width: auto;
  display: block;
}

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

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  padding: 0.5rem 0;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-fast);
}

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

.lang-switcher {
  border-left: 1px solid var(--color-border);
  padding-left: 1.5rem;
}

.lang-link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.lang-link:hover {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

/* Theme Toggle Button */
.theme-toggle-wrapper {
  display: flex;
  align-items: center;
}

.theme-toggle-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 0.45rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  line-height: 1;
}

.theme-toggle-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

/* Default (Light Mode): show moon icon (to switch to dark), hide sun icon */
.sun-icon {
  display: none;
}
.moon-icon {
  display: block;
}

/* Dark Mode: show sun icon (to switch to light), hide moon icon */
[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}

[data-theme="dark"] .page-content tr:nth-child(even) td {
  background-color: rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .page-content code {
  background: rgba(255, 255, 255, 0.07);
}

/* Mobile Nav Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle .bar {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: var(--transition-normal);
}

/* 4. Main Hero Section */
.hero-section {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: 5rem 2rem;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, var(--color-bg-transparent) 50%);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 10% 80%, rgba(13, 148, 136, 0.05) 0%, var(--color-bg-transparent) 50%);
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  z-index: 1;
}

.hero-content {
  max-width: 700px;
}

.hero-tagline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  display: inline-block;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  box-shadow: var(--shadow-glow);
  color: var(--color-text-primary);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-secondary);
  transform: translateY(-2px);
}

/* 5. Features Section */
.features-section {
  padding: 7rem 2rem;
  background-color: #f1f5f9;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 4.5rem;
}

.section-header h2 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-5px);
  background-color: var(--color-surface-hover);
  border-color: var(--color-text-muted);
}

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

.feature-icon {
  width: 50px;
  height: 50px;
  background-color: rgba(6, 182, 212, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.75rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* 6. Standalone Page Content Layout */
.page-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 5rem 2rem;
  width: 100%;
}

.page-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2.5rem;
  margin-bottom: 3.5rem;
}

.page-title {
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}

.page-description {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
}

.page-content {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.page-content p {
  margin-bottom: 1.75rem;
  color: var(--color-text-secondary);
}

.page-content h2 {
  font-size: 1.85rem;
  margin: 3.5rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.page-content h3 {
  font-size: 1.4rem;
  margin: 2.5rem 0 1rem;
}

.page-content ul,
.page-content ol {
  margin-bottom: 2rem;
  padding-left: 1.5rem;
}

.page-content li {
  margin-bottom: 0.5rem;
}

/* Custom Table Styling (Very important for math/operational grids) */
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5rem 0;
  font-size: 0.95rem;
  text-align: left;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.page-content th,
.page-content td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.page-content th {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-weight: 600;
  font-family: var(--font-display);
}

.page-content tr:last-child td {
  border-bottom: none;
}

.page-content tr:nth-child(even) td {
  background-color: rgba(15, 23, 42, 0.02);
}

.page-content table strong {
  color: var(--color-accent);
}

/* Styled inline and display math */
.page-content code {
  background: rgba(15, 23, 42, 0.05);
  color: var(--color-primary);
  font-family: monospace;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

/* 7. Blog Section Styles */
.blog-archive-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
  width: 100%;
}

.blog-grid-section {
  margin-top: 4.5rem;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 3rem;
}

.blog-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.blog-card:hover {
  transform: translateY(-4px);
  background-color: var(--color-surface-hover);
  border-color: var(--color-text-muted);
}

.blog-card-content {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.blog-card-title {
  font-size: 1.45rem;
  margin-bottom: 1.25rem;
}

.blog-card-title a {
  color: var(--color-text-primary);
}

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

.blog-card-excerpt p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.blog-card-footer {
  margin-top: auto;
}

.read-more-link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
}

.read-more-link:hover {
  color: var(--color-secondary);
}

/* Blog Single Page Styles */
.blog-post-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-top: 1rem;
}

.blog-post-author {
  font-weight: 500;
  color: var(--color-text-primary);
}

.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2.5rem 0;
  border: 1px solid var(--color-border);
}

/* 8. Footer */
.site-footer {
  margin-top: auto;
  background-color: #f1f5f9;
  border-top: 1px solid var(--color-border);
  padding: 5rem 2rem 3rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-primary);
}

.footer-description {
  max-width: 480px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.footer-contact h3 {
  font-size: 1.15rem;
  margin-bottom: 1.5rem;
}

.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.contact-label {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-right: 0.5rem;
}

.footer-bottom {
  grid-column: span 2;
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
  margin-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* 9. Responsive Adjustments */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .site-nav {
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: 3rem 2rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    z-index: 99;
    border-top: 1px solid var(--color-border);
  }
  
  body.nav-open .site-nav {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  body.nav-open .mobile-menu-toggle .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  body.nav-open .mobile-menu-toggle .bar:nth-child(2) {
    opacity: 0;
  }
  
  body.nav-open .mobile-menu-toggle .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 2.5rem;
    width: 100%;
  }
  
  .lang-switcher {
    border-left: none;
    padding-left: 0;
    margin-top: 1.5rem;
  }
  
  .hero-section {
    padding: 4rem 1.5rem;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: 1rem;
  }
  
  .features-section {
    padding: 5rem 1.5rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .footer-bottom {
    grid-column: 1;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  /* Scrollable tables on mobile */
  .page-content {
    overflow-x: auto;
  }
  
  .page-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}