/* Modern CSS Reset & Variables */
:root {
  /* Colors */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #f59e0b;
  --accent: #10b981;
  --danger: #ef4444;
  
  /* Backgrounds */
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(26, 26, 46, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.05);
  
  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  /* Borders */
  --border-primary: rgba(255, 255, 255, 0.1);
  --border-secondary: rgba(255, 255, 255, 0.05);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Typography */
  --font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* Animated Background */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
}

.floating-shapes {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary), var(--primary-light));
  opacity: 0.1;
  animation: float 20s infinite linear;
}

.shape-1 {
  width: 80px;
  height: 80px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 120px;
  height: 120px;
  top: 60%;
  right: 10%;
  animation-delay: -5s;
}

.shape-3 {
  width: 60px;
  height: 60px;
  top: 80%;
  left: 20%;
  animation-delay: -10s;
}

.shape-4 {
  width: 100px;
  height: 100px;
  top: 10%;
  right: 30%;
  animation-delay: -15s;
}

.shape-5 {
  width: 140px;
  height: 140px;
  top: 40%;
  left: 50%;
  animation-delay: -7s;
}

@keyframes float {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  33% {
    transform: translateY(-30px) rotate(120deg);
  }
  66% {
    transform: translateY(30px) rotate(240deg);
  }
  100% {
    transform: translateY(0px) rotate(360deg);
  }
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
  transform: none;
  transform-style: flat;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  position: relative;
  transform: none;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  filter: drop-shadow(0 4px 8px rgba(99, 102, 241, 0.3));
  transition: transform var(--transition-normal);
}

.nav-logo:hover {
  transform: scale(1.1) rotate(5deg);
}

.nav-title {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  position: relative;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: translateX(-50%);
  transition: width var(--transition-normal);
}

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

.nav-link:hover::before,
.nav-link.active::before {
  width: 80%;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 48px;
  height: 48px;
  padding: 0 !important;
  margin: 0 !important;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.3s ease, border-color 0.3s ease;
  transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
  transform-origin: center center !important;
  position: relative;
  flex-shrink: 0;
  cursor: pointer;
  overflow: visible;
  isolation: isolate;
  will-change: auto;
  backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
}

.mobile-menu-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: #6366f1;
  transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
  -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
}

.mobile-menu-btn:active {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-menu-btn span {
  width: 26px;
  height: 2.5px;
  background: #ffffff;
  border-radius: 2px;
  transition: none !important;
  display: block;
  transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
  transform-origin: center center !important;
  margin: 0 !important;
  padding: 0 !important;
  flex-shrink: 0;
  position: relative;
  left: 0;
  right: 0;
  isolation: isolate;
  backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
}

.mobile-menu-btn span:nth-child(1),
.mobile-menu-btn span:nth-child(2),
.mobile-menu-btn span:nth-child(3) {
  transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
  -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(1) !important;
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-2xl);
  margin-bottom: var(--space-xl);
  backdrop-filter: blur(10px);
  animation: slideUp 0.8s ease-out;
}

.badge-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  animation: slideUp 0.8s ease-out 0.2s both;
}

.title-gradient {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.title-gradient::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary), var(--accent));
  opacity: 0.1;
  filter: blur(20px);
  z-index: -1;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: slideUp 0.8s ease-out 0.4s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
  animation: slideUp 0.8s ease-out 0.6s both;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Modes Section */
.modes-section {
  padding: var(--space-3xl) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.mode-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.mode-card:hover::before {
  opacity: 0.05;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-slow);
  z-index: -1;
}

.mode-card:hover .card-glow {
  opacity: 0.1;
}

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

.card-icon {
  width: 60px;
  height: 60px;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
}

.card-icon img {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 4px 8px rgba(99, 102, 241, 0.3));
  transition: transform var(--transition-normal);
}

.mode-card:hover .card-icon {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.mode-card:hover .card-icon img {
  transform: scale(1.1);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.card-desc {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
}

.card-arrow {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.mode-card:hover .card-arrow {
  background: var(--primary);
  color: white;
  transform: translateX(4px);
}

.mode-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-primary);
  background: var(--bg-secondary);
  padding: var(--space-2xl) var(--space-lg);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.2));
}

.footer-title {
  font-size: 1.25rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: center;
}

.footer-link {
  color: var(--primary-light);
  transition: color var(--transition-normal);
}

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

/* Animations */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Mobile Menu Styles */
.mobile-nav-menu {
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(15, 15, 35, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
  padding: var(--space-lg);
}

.mobile-nav-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mobile-nav-link {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  text-align: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-primary);
}

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

/* Mobile menu button animations */
.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(9px, 9px) !important;
}

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

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(9px, -9px) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    transform: translate(0, 0) rotate(0deg) !important;
  }
  
  .mobile-menu-btn span {
    transform: translate(0, 0) rotate(0deg) !important;
    transition: all var(--transition-normal) !important;
  }
  
  .hero-section {
    padding: var(--space-2xl) var(--space-md);
    min-height: 80vh;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }
  
  .modes-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .section-header {
    margin-bottom: var(--space-2xl);
  }
  
  .modes-section {
    padding: var(--space-2xl) var(--space-md);
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .hero-section {
    padding: var(--space-xl) var(--space-sm);
  }
  
  .modes-section {
    padding: var(--space-xl) var(--space-sm);
  }
  
  .mode-card {
    padding: var(--space-lg);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .floating-shapes {
    display: none;
  }
}

/* Focus styles for accessibility */
.nav-link:focus-visible,
.mode-card:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --bg-primary: #000000;
    --bg-secondary: #1a1a1a;
    --text-primary: #ffffff;
    --border-primary: rgba(255, 255, 255, 0.3);
  }
}