/* ============================================
   PIVIX - STYLES.CSS
   Next-Generation AI Intelligence Hub
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */
:root {
  /* Colors */
  --sky-blue: #0ea5e9;
  --orange: #f97316;
  --gradient-primary: linear-gradient(135deg, #0ea5e9, #f97316);
  --gradient-bg: linear-gradient(135deg, #f0f9ff 0%, #fef3f2 50%, #faf5ff 100%);
  
  /* Accent Colors */
  --blue-accent: #3b82f6;
  --green-accent: #10b981;
  --orange-accent: #f97316;
  --purple-accent: #a855f7;
  --pink-accent: #ec4899;
  --teal-accent: #14b8a6;
  --amber-accent: #f59e0b;
  
  /* Neutral Colors */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 100px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Effects */
  --blur-sm: blur(8px);
  --blur-md: blur(16px);
  --blur-lg: blur(24px);
  --blur-xl: blur(32px);
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  background: var(--gradient-bg);
  background-attachment: fixed;
  color: var(--slate-800);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Animated Mesh Gradient Background */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(249, 115, 22, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 40% 90%, rgba(168, 85, 247, 0.1) 0%, transparent 50%);
  animation: meshGradient 20s ease-in-out infinite;
  z-index: -1;
  pointer-events: none;
}

@keyframes meshGradient {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(5%, -5%) rotate(60deg);
  }
  66% {
    transform: translate(-5%, 5%) rotate(-60deg);
  }
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(3rem, 8vw, 8rem);
  font-weight: 900;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--slate-600);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-base);
}

/* Gradient Text */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

/* ============================================
   GLASS EFFECTS
   ============================================ */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-strong {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: var(--blur-xl);
  -webkit-backdrop-filter: var(--blur-xl);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 12px 48px 0 rgba(31, 38, 135, 0.2);
}

.glass-subtle {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 16px 0 rgba(31, 38, 135, 0.1);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

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

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 4rem);
  max-width: 1200px;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  z-index: 1000;
  transition: all var(--transition-smooth);
}

.navbar.scrolled {
  top: var(--spacing-sm);
  box-shadow: 0 16px 64px 0 rgba(31, 38, 135, 0.25);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.nav-logo {
  font-size: 1.75rem;
  font-weight: 900;
  font-family: var(--font-heading);
  letter-spacing: -0.03em;
  transition: transform var(--transition-base);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-link {
  font-weight: 500;
  color: var(--slate-600);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  position: relative;
  transition: all var(--transition-base);
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

.nav-link:hover {
  color: var(--sky-blue);
  transform: translateY(-2px);
}

.nav-link:hover::before {
  transform: translateX(-50%) scaleX(1);
}

.nav-link.active {
  color: var(--sky-blue);
  font-weight: 600;
}

.nav-link.active::before {
  transform: translateX(-50%) scaleX(1);
}

/* CTA Button in Nav */
.nav-cta {
  background: var(--gradient-primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
}

.nav-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 28px;
  height: 3px;
  background: var(--slate-700);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 400px;
  height: 100vh;
  backdrop-filter: var(--blur-xl);
  -webkit-backdrop-filter: var(--blur-xl);
  background: rgba(255, 255, 255, 0.95);
  padding: 6rem 2rem 2rem;
  transition: right var(--transition-smooth);
  z-index: 999;
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu .nav-links {
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-sm);
  width: 100%;
}

.mobile-menu .nav-link {
  font-size: 1.25rem;
  width: 100%;
  padding: 1rem;
}

.mobile-menu .nav-cta {
  width: 100%;
  margin-top: var(--spacing-md);
  text-align: center;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: 998;
}

.mobile-menu-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1.125rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: white;
  color: var(--slate-700);
  border: 2px solid var(--slate-200);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  border-color: var(--sky-blue);
  color: var(--sky-blue);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.15);
}

.btn-ghost {
  background: transparent;
  color: var(--sky-blue);
  border: 2px solid var(--sky-blue);
}

.btn-ghost:hover {
  background: var(--sky-blue);
  color: white;
  transform: translateY(-3px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1000px;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 1s var(--transition-smooth) forwards;
  opacity: 0;
}

/* Floating Animation for Hero H1 */
.hero h1.float-text {
  animation: fadeInUp 1s var(--transition-smooth) forwards,
             floatText 14s ease-in-out 1s infinite;
}

@keyframes floatText {
  0% { transform: translate(0, 0) rotate(0deg); }
  15% { transform: translate(-12px, -18px) rotate(-0.5deg); }
  30% { transform: translate(15px, -10px) rotate(0.8deg); }
  45% { transform: translate(-8px, -22px) rotate(-0.3deg); }
  60% { transform: translate(18px, -8px) rotate(1deg); }
  75% { transform: translate(-15px, -15px) rotate(-0.7deg); }
  90% { transform: translate(8px, -20px) rotate(0.4deg); }
  100% { transform: translate(0, 0) rotate(0deg); }
}

.hero-subtitle {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  color: var(--slate-500);
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.8;
  animation: fadeInUp 1s var(--transition-smooth) 0.2s forwards;
  opacity: 0;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s var(--transition-smooth) 0.4s forwards;
  opacity: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Smaller Hero for Internal Pages */
.hero-sm {
  min-height: 60vh;
  padding: calc(var(--spacing-xl) + 80px) var(--spacing-md) var(--spacing-lg);
}

/* ============================================
   STATS SECTION
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.stat-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-slow);
}

.stat-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(31, 38, 135, 0.25);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-number {
  font-size: 4rem;
  font-weight: 900;
  font-family: var(--font-heading);
  margin-bottom: var(--spacing-xs);
  line-height: 1;
}

.stat-label {
  font-size: 1.125rem;
  color: var(--slate-600);
  font-weight: 500;
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.feature-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  transition: all var(--transition-slow);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  opacity: 0;
  transition: opacity var(--transition-slow);
  z-index: -1;
}

.feature-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 20px 60px rgba(31, 38, 135, 0.3);
}

.feature-card:hover::before {
  opacity: 0.1;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  display: inline-block;
  transition: transform var(--transition-slow);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--slate-800);
}

.feature-description {
  color: var(--slate-600);
  line-height: 1.7;
}

/* ============================================
   ACCENT SECTIONS
   ============================================ */
.accent-section {
  background: rgba(14, 165, 233, 0.05);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin: var(--spacing-lg) 0;
  border: 1px solid rgba(14, 165, 233, 0.1);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

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

.section-subtitle {
  font-size: 1.25rem;
  color: var(--slate-500);
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   NEWS FEED STYLES
   ============================================ */
.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(239, 68, 68, 0.1);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  color: #dc2626;
  margin-bottom: var(--spacing-md);
}

.live-dot {
  width: 12px;
  height: 12px;
  background: #ef4444;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.1);
    box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
  }
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.news-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.category-header {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-left: 4px solid;
}

.category-blue {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--blue-accent);
  color: var(--blue-accent);
}

.category-green {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--green-accent);
  color: var(--green-accent);
}

.category-orange {
  background: rgba(249, 115, 22, 0.1);
  border-color: var(--orange-accent);
  color: var(--orange-accent);
}

.category-purple {
  background: rgba(168, 85, 247, 0.1);
  border-color: var(--purple-accent);
  color: var(--purple-accent);
}

.category-pink {
  background: rgba(236, 72, 153, 0.1);
  border-color: var(--pink-accent);
  color: var(--pink-accent);
}

.category-teal {
  background: rgba(20, 184, 166, 0.1);
  border-color: var(--teal-accent);
  color: var(--teal-accent);
}

.news-item {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 1px solid transparent;
}

.news-item:hover {
  transform: translateX(8px);
  border-color: rgba(14, 165, 233, 0.2);
  box-shadow: 0 8px 24px rgba(31, 38, 135, 0.15);
}

.news-title {
  font-weight: 600;
  color: var(--slate-800);
  margin-bottom: var(--spacing-xs);
  line-height: 1.5;
}

.news-date {
  font-size: 0.875rem;
  color: var(--slate-400);
}

.category-footer {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--slate-200);
}

.category-footer a {
  color: var(--sky-blue);
  font-weight: 500;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: all var(--transition-base);
}

.category-footer a:hover {
  gap: 0.5rem;
}

/* ============================================
   SOURCE CARDS
   ============================================ */
.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.source-category {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.source-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-slow);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.source-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transition: transform var(--transition-slow);
}

.source-link:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(31, 38, 135, 0.2);
}

.source-link:hover::before {
  transform: scaleY(1);
}

.source-icon {
  width: 60px;
  height: 60px;
  min-width: 60px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  background: var(--gradient-primary);
  color: white;
  transition: transform var(--transition-slow);
}

.source-link:hover .source-icon {
  transform: rotate(5deg) scale(1.1);
}

.source-info {
  flex: 1;
}

.source-name {
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: 0.25rem;
  font-size: 1.125rem;
}

.source-description {
  font-size: 0.9375rem;
  color: var(--slate-600);
  line-height: 1.5;
}

/* ============================================
   RESEARCH & BUILDER CARDS
   ============================================ */
.paper-repos-grid,
.labs-grid,
.conference-grid,
.builders-grid,
.community-grid,
.robotics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.repo-card,
.lab-card,
.conference-card,
.builder-card,
.community-card,
.robotics-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-slow);
  cursor: pointer;
  position: relative;
}

.repo-card:hover,
.lab-card:hover,
.conference-card:hover,
.builder-card:hover,
.community-card:hover,
.robotics-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 60px rgba(31, 38, 135, 0.25);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  display: inline-block;
  transition: transform var(--transition-slow);
}

.repo-card:hover .card-icon,
.lab-card:hover .card-icon,
.conference-card:hover .card-icon,
.builder-card:hover .card-icon,
.community-card:hover .card-icon,
.robotics-card:hover .card-icon {
  transform: scale(1.2) rotate(-5deg);
}

.card-title {
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--spacing-xs);
  font-size: 1.25rem;
}

.card-description {
  color: var(--slate-600);
  line-height: 1.6;
  font-size: 0.9375rem;
}

.card-cta {
  margin-top: var(--spacing-md);
  color: var(--sky-blue);
  font-weight: 600;
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition-base);
}

.repo-card:hover .card-cta,
.lab-card:hover .card-cta,
.conference-card:hover .card-cta,
.builder-card:hover .card-cta,
.community-card:hover .card-cta,
.robotics-card:hover .card-cta {
  gap: 0.5rem;
}

/* Member Count Badge */
.member-count {
  display: inline-block;
  margin-top: var(--spacing-xs);
  padding: 0.25rem 0.75rem;
  background: rgba(14, 165, 233, 0.1);
  color: var(--sky-blue);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

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

.footer-column h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

.footer-column p {
  color: var(--slate-500);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-xs);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-links a {
  color: var(--slate-600);
  transition: all var(--transition-base);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--sky-blue);
  transform: translateX(4px);
}

.footer-bottom {
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  text-align: center;
  color: var(--slate-500);
  font-size: 0.9375rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 968px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }
  
  .navbar {
    width: calc(100% - 2rem);
  }
  
  .nav-links {
    display: none;
  }
  
  .nav-cta {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  h1 {
    font-size: clamp(3rem, 10vw, 4.5rem);
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .sources-grid {
    grid-template-columns: 1fr;
  }
  
  .source-link {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 600px) {
  :root {
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 3rem;
  }
  
  h1 {
    font-size: 3rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-number {
    font-size: 3rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
  text-align: center;
}

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

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

/* ============================================
   ACCESSIBILITY
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Styles */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--sky-blue);
  outline-offset: 4px;
  border-radius: 4px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Stagger delays for multiple elements */
.reveal:nth-child(1) { transition-delay: 0.1s; }
.reveal:nth-child(2) { transition-delay: 0.2s; }
.reveal:nth-child(3) { transition-delay: 0.3s; }
.reveal:nth-child(4) { transition-delay: 0.4s; }
.reveal:nth-child(5) { transition-delay: 0.5s; }
.reveal:nth-child(6) { transition-delay: 0.6s; }

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */
.will-change-transform {
  will-change: transform;
}

.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}