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

:root {
  /* Colors */
  --color-bg-dark: #0a0e0f;
  --color-bg-darker: #050708;
  --color-surface: #141b1f;
  --color-surface-hover: #1a2328;
  --color-border: #2a3438;

  --color-primary: #d4ff00;
  --color-primary-hover: #e0ff33;
  --color-primary-text: #0a0e0f;

  --color-text-primary: #ffffff;
  --color-text-secondary: #a8b2b7;
  --color-text-muted: #6b7780;

  --color-accent-cyan: #00fff5;
  --color-accent-purple: #8b5cf6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 3rem;
  --font-size-5xl: 4rem;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(212, 255, 0, 0.3);
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-5xl);
}
h2 {
  font-size: var(--font-size-4xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}

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

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

/* Buttons */
button {
  font-family: var(--font-family);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  justify-content: center;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-text);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
}

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

.btn-large {
  padding: 1.25rem 2.5rem;
  font-size: var(--font-size-lg);
}

.btn-icon {
  font-size: 1.25em;
}

.btn-play {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(212, 255, 0, 0.9);
  backdrop-filter: blur(10px);
  font-size: 2rem;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition-base);
}

.btn-play:hover {
  transform: scale(0.9);
  background: var(--color-primary);
}

/* Links */
.link-primary {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

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

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  font-size: var(--font-size-3xl);
}

/* Glassmorphism */
.glass {
  background: rgba(20, 27, 31, 0.6);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border);
}

/* Utilities */
.text-center {
  text-align: center;
}
.text-muted {
  color: var(--color-text-muted);
}
.mt-sm {
  margin-top: var(--spacing-sm);
}
.mt-md {
  margin-top: var(--spacing-md);
}
.mt-lg {
  margin-top: var(--spacing-lg);
}
.mb-sm {
  margin-bottom: var(--spacing-sm);
}
.mb-md {
  margin-bottom: var(--spacing-md);
}
.mb-lg {
  margin-bottom: var(--spacing-lg);
}