/* style.css - Cyber-Gaming Premium Design System (SEO 2026 / UX Refined) */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800;900&display=swap');

/* --- Custom Variables & Theme System --- */
:root {
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
  
  /* Cyber Dark Theme Palette (Default) */
  --bg-primary: #050814;
  --bg-secondary: #0c1026;
  --bg-tertiary: #161c3c;
  --bg-glass: rgba(12, 16, 38, 0.75);
  --border-glass: rgba(99, 102, 241, 0.18);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  /* Neon Accents */
  --primary: #6366f1;         /* Neon Indigo */
  --primary-hover: #818cf8;
  --primary-rgb: 99, 102, 241;
  
  --secondary: #06b6d4;       /* Cyber Cyan */
  --secondary-hover: #22d3ee;
  
  --accent: #d946ef;          /* Neon Magenta */
  --accent-hover: #f472b6;
  
  --border-color: #1e293b;
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.5), 0 0 15px rgba(99, 102, 241, 0.08);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);
  --focus-ring: 0 0 0 3px rgba(6, 182, 212, 0.4);
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-glow: 0.5s ease;
  
  --container-width: 1200px;
  --header-height: 75px;
}

[data-theme="light"] {
  /* Cyber Light Theme Palette (Modish & High Contrast) */
  --bg-primary: #f4f6fb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.8);
  --border-glass: rgba(99, 102, 241, 0.25);
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  
  --secondary: #0891b2;
  --secondary-hover: #0e7490;
  
  --accent: #c084fc;
  --accent-hover: #a855f7;
  
  --border-color: #cbd5e1;
  --card-shadow: 0 4px 20px -2px rgba(99, 102, 241, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  padding-bottom: 2rem;
  overflow-x: hidden;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 1.85rem;
  margin-top: 2.5rem;
  border-left: 4px solid var(--secondary);
  padding-left: 0.75rem;
}

h3 { font-size: 1.45rem; margin-top: 1.75rem; }
h4 { font-size: 1.2rem; margin-top: 1.5rem; }

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 0.75rem 1.5rem;
  z-index: 9999;
  font-weight: 700;
  transition: top var(--transition-fast);
  border-bottom-right-radius: 0.5rem;
}

.skip-link:focus {
  top: 0;
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Accessibility Focus Outline */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid transparent;
  box-shadow: var(--focus-ring);
  border-radius: 0.375rem;
}

/* --- Layout Containers --- */
.container {
  width: 92%;
  max-width: var(--container-width);
  margin: 0 auto;
}

.grid-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-top: 2.5rem;
}

@media (min-width: 1024px) {
  .grid-layout {
    grid-template-columns: 8fr 4fr;
  }
}

/* --- Interactive Particles Background Canvas --- */
#cyber-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  transition: opacity var(--transition-normal);
}

/* --- Header & Navigation (Glassmorphism) --- */
.header-wrapper {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  transition: background-color var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo a {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

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

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

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

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

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

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-glass);
  border-radius: 0.75rem;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  background-color: rgba(var(--primary-rgb), 0.05);
}

.theme-toggle-btn:hover {
  background-color: rgba(var(--primary-rgb), 0.15);
  box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.2);
}

.theme-toggle-btn svg {
  width: 1.35rem;
  height: 1.35rem;
}

.theme-toggle-btn .sun-icon { display: none; }
[data-theme="light"] .theme-toggle-btn .sun-icon { display: block; }
[data-theme="light"] .theme-toggle-btn .moon-icon { display: none; }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  background: none;
  border: 1px solid var(--border-glass);
  border-radius: 0.75rem;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  display: block;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Mobile Nav Drawer */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glass);
  padding: 2rem;
  transform: translateY(-150%);
  transition: transform var(--transition-normal);
  z-index: 999;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--card-shadow);
}

.mobile-nav.open {
  transform: translateY(0);
}

.mobile-nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --- Reading Progress Bar --- */
.progress-container {
  width: 100%;
  height: 4px;
  background: transparent;
  position: absolute;
  bottom: 0;
  left: 0;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(to right, var(--primary), var(--secondary), var(--accent));
  width: 0%;
}

/* --- Animation Keyframes & Card Pulsing --- */
@keyframes neonPulse {
  0% { border-color: rgba(99, 102, 241, 0.18); box-shadow: var(--card-shadow); }
  50% { border-color: rgba(6, 182, 212, 0.4); box-shadow: 0 0 25px rgba(6, 182, 212, 0.2); }
  100% { border-color: rgba(99, 102, 241, 0.18); box-shadow: var(--card-shadow); }
}

/* --- Hero Section (Neon Accent Border & Pulse) --- */
.hero-card {
  position: relative;
  border-radius: 1.25rem;
  overflow: hidden;
  margin-top: 2rem;
  border: 1px solid var(--border-glass);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), transparent);
  animation: neonPulse 7s infinite ease-in-out;
}

.hero-image-wrapper {
  background-color: var(--bg-secondary);
  aspect-ratio: 16/9;
  overflow: hidden;
  position: relative;
}

.hero-image-wrapper::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg-primary) 0%, transparent 60%);
  pointer-events: none;
}

.hero-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.hero-card:hover .hero-image-wrapper img {
  transform: scale(1.03);
}

/* --- Breadcrumb --- */
.breadcrumb {
  margin: 2rem 0 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
}

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

.breadcrumb-separator {
  margin: 0 0.5rem;
  color: var(--border-color);
}

/* --- Article Elements & Badges --- */
.article-header {
  margin-bottom: 2.5rem;
}

.category-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid var(--border-glass);
  color: var(--secondary);
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.meta-info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.meta-item a {
  color: var(--text-secondary);
  font-weight: 600;
}

/* Author Avatar */
.author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary);
}

/* E-E-A-T Fact Check Alert */
.fact-checked-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--success);
  font-weight: 700;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 0.3rem 0.65rem;
  border-radius: 0.375rem;
  font-size: 0.8rem;
}

/* Key Takeaways (GEO Block) */
.key-takeaways {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(6, 182, 212, 0.08));
  border: 1px solid var(--border-glass);
  border-left: 4px solid var(--primary);
  border-radius: 0.75rem;
  padding: 2rem;
  margin: 2.5rem 0;
  box-shadow: var(--card-shadow);
}

.key-takeaways h3 {
  margin-top: 0;
  font-size: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.key-takeaways ul {
  list-style: none;
  margin-top: 1rem;
}

.key-takeaways li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--text-secondary);
}

.key-takeaways li::before {
  content: "⚡";
  position: absolute;
  left: 0;
  color: var(--secondary);
}

/* Informative Blocks (GEO Blocks) */
.info-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.75rem;
  margin: 2rem 0;
}

.info-block.fact {
  border-left: 4px solid var(--success);
  background: linear-gradient(90deg, rgba(16, 185, 129, 0.03), transparent);
}

.info-block.definition {
  border-left: 4px solid var(--secondary);
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.03), transparent);
}

.info-block-title {
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.info-block p {
  color: var(--text-secondary);
  font-size: 0.975rem;
}

/* Interactive Calculator Widget (WOW Factor) */
.calculator-card {
  background: linear-gradient(135deg, #0e1230 0%, #080a1a 100%);
  border: 1px solid var(--border-glass);
  border-radius: 1rem;
  padding: 2.25rem;
  margin: 3rem 0;
  animation: neonPulse 7s infinite ease-in-out;
  animation-delay: 2s; /* Desynchronize pulse from hero card */
}

.calculator-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.calc-group {
  margin-bottom: 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.calc-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.calc-control {
  width: 100%;
  accent-color: var(--secondary);
  background: var(--bg-primary);
  border-radius: 0.25rem;
}

.calc-checkboxes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .calc-checkboxes {
    grid-template-columns: 1fr 1fr;
  }
}

.calc-check-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.calc-check-label input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--secondary);
  cursor: pointer;
}

.score-display-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-glass);
}

.score-display-radial {
  position: relative;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, #0c1026 50%, transparent 51%), conic-gradient(var(--secondary) 0%, var(--bg-tertiary) 0%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

.score-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
}

.score-rating {
  margin-top: 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--secondary);
}

/* Article content layout */
.article-content p {
  margin-bottom: 1.75rem;
  font-size: 1.075rem;
  color: var(--text-secondary);
  text-align: justify;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.75rem;
  padding-left: 1.75rem;
  color: var(--text-secondary);
  font-size: 1.075rem;
}

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

.article-content blockquote {
  font-style: italic;
  border-left: 4px solid var(--primary);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 2rem 0;
  color: var(--text-muted);
  font-size: 1.2rem;
  background: rgba(99, 102, 241, 0.03);
}

/* Call to action */
.cta-box {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
  border: 1px solid var(--border-glass);
  border-radius: 1rem;
  padding: 2.5rem;
  margin: 3rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(var(--primary-rgb), 0.1) 0%, transparent 60%);
  pointer-events: none;
}

.cta-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  padding: 0.85rem 2.25rem;
  border-radius: 0.75rem;
  font-weight: 700;
  margin-top: 1.25rem;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.5);
  color: #ffffff;
}

/* --- FAQ Accordion --- */
.faq-section {
  margin-top: 4rem;
}

.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: 0.75rem;
  background-color: var(--bg-secondary);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(var(--primary-rgb), 0.4);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  text-align: left;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
}

.faq-question svg {
  width: 1.5rem;
  height: 1.5rem;
  transition: transform var(--transition-normal);
  color: var(--text-muted);
}

.faq-question.active svg {
  transform: rotate(180deg);
  color: var(--secondary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out;
}

.faq-answer p {
  padding-top: 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
  margin: 0;
}

/* --- Editorial / Author Profile Card (E-E-A-T) --- */
.author-profile-card {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 1rem;
  padding: 2rem;
  margin-top: 4rem;
  position: relative;
}

@media (min-width: 640px) {
  .author-profile-card {
    flex-direction: row;
    align-items: center;
  }
}

.author-profile-pic {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary);
  box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.2);
  flex-shrink: 0;
}

.author-profile-info h4 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
}

.author-profile-role {
  color: var(--secondary);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.author-profile-bio {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.author-profile-links {
  display: flex;
  gap: 1.25rem;
}

.author-profile-links a {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
}

.author-profile-links a:hover {
  color: var(--secondary);
}

/* --- Sidebar Section (Aside - Glassmorphism widgets) --- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.widget {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 1rem;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.widget-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-glass);
  padding-bottom: 0.65rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Table of Contents */
.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.toc-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: block;
  border-left: 2px solid transparent;
  padding-left: 0.85rem;
  transition: all var(--transition-fast);
}

.toc-link:hover,
.toc-link.active {
  color: var(--secondary);
  border-left-color: var(--secondary);
  font-weight: 600;
  padding-left: 1.15rem;
}

/* Editorial widget */
.editorial-widget p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.editorial-widget a {
  font-weight: 700;
  font-size: 0.95rem;
}

/* Popular Articles list */
.popular-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.popular-item {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.popular-item img {
  width: 70px;
  height: 70px;
  border-radius: 0.5rem;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border-glass);
}

.popular-item-content h5 {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.4;
}

.popular-item-content a {
  color: var(--text-primary);
}

.popular-item-content a:hover {
  color: var(--secondary);
}

.popular-item-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Share Page Widget */
.share-container {
  display: flex;
  gap: 1rem;
}

.share-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.65rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  background: var(--primary);
  box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.3);
}

/* --- External References / Citation Section --- */
.references-section {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-top: 3.5rem;
}

.references-section h4 {
  margin-top: 0;
  font-size: 1.1rem;
}

.references-list {
  list-style: none;
  padding: 0;
}

.references-list li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.references-list li::before {
  content: "🔗";
  font-size: 0.85rem;
}

/* --- Scroll Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: transform, opacity;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* --- Footer --- */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  margin-top: 5rem;
  padding: 5rem 0 2.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-info p {
  margin-top: 1rem;
  color: var(--text-muted);
  max-width: 350px;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-links a {
  color: var(--text-muted);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-bottom-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.footer-bottom-links a {
  color: var(--text-muted);
}

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

/* --- Contact Page Form Layout --- */
.contact-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  margin-top: 2.5rem;
}

@media (min-width: 768px) {
  .contact-container {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: var(--card-shadow);
}

.contact-item {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.contact-item svg {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--secondary);
  flex-shrink: 0;
}

.contact-item h5 {
  margin: 0;
  font-size: 1.15rem;
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.25rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.15rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-glass);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: var(--focus-ring);
}

.submit-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
  border: none;
  padding: 0.85rem 2rem;
  border-radius: 0.75rem;
  font-weight: 700;
  font-family: var(--font-primary);
  cursor: pointer;
  width: 100%;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.5);
}

/* --- Floating Utilities --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
  transition: all var(--transition-normal);
  box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.4);
  z-index: 99;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
}

/* Image Fade Transition */
.lazy-image {
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.lazy-image.loaded {
  opacity: 1;
}

.aspect-ratio-16-9 {
  aspect-ratio: 16 / 9;
  background-color: var(--bg-tertiary);
  width: 100%;
  display: block;
}

/* Toast Notification styling */
.toast-msg {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  padding: 0.85rem 1.75rem;
  border-radius: 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), 0 0 15px rgba(var(--primary-rgb), 0.25);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 10000;
}

.toast-msg.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* --- Prefers Reduced Motion override --- */
@media (prefers-reduced-motion: reduce) {
  .hero-card, .calculator-card {
    animation: none !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  #cyber-particles {
    display: none !important;
  }
}