:root {
  /* Color Palette - Charcoal Base + Deep Navy + Solana Gradient */
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --primary-color: #00ffa3; /* Aqua */
  --secondary-color: #9945ff; /* Purple */
  --accent-color: #14f195; /* Green */
  --highlight-color: #00ffff; /* Cyan Hologram */
  --surface-color: #1e1e1e;
  --border-color: #333;

  --font-heading: "Inter", sans-serif;
  --font-body: "Inter", sans-serif;

  --transition-speed: 0.3s;
}

/* Light Theme Override */
:root:not(.dark) {
  --bg-color: #f4f4f4;
  --text-color: #121212;
  --surface-color: #ffffff;
  --border-color: #ddd;
}

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

html {
  scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    
    /* AI Tech Future Background */
    background-image: 
        /* Cyber Grid */
        linear-gradient(rgba(0, 255, 163, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 163, 0.05) 1px, transparent 1px),
        /* Deep Glows */
        radial-gradient(circle at 50% 0%, rgba(153, 69, 255, 0.15), transparent 60%),
        radial-gradient(circle at 100% 50%, rgba(0, 255, 163, 0.1), transparent 50%),
        radial-gradient(circle at 0% 50%, rgba(20, 241, 149, 0.1), transparent 50%);
        
    background-size: 
        50px 50px, /* Grid size */
        50px 50px, /* Grid size */
        100% 100%, /* Glows */
        100% 100%,
        100% 100%;
        
    background-attachment: fixed;
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Utility Classes */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(
    45deg,
    var(--secondary-color),
    var(--primary-color)
  );
  color: #000;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.btn-outline {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

.btn-outline:hover {
  background: var(--primary-color);
  color: #000;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(18, 18, 18, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 40px;
}

.nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
}

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

.nav-controls {
  display: flex;
  gap: 15px;
  align-items: center;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px; /* Offset for fixed nav */
}

.hero-content {
  z-index: 2;
  max-width: 800px;
}

.hero h1 {
  font-size: 3.5rem;
    background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: var(--text-color);
  opacity: 0.9;
}

.hero-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 80%;
  z-index: 1;
  opacity: 0.3;
  pointer-events: none;
}

/* Sections General */
section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--primary-color);
}

/* Footer */
footer {
  padding: 40px 0;
  text-align: center;
  background-color: var(--surface-color);
  font-size: 0.9rem;
  color: #888;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* TODO: Implement hamburger menu */
  }

  .hero h1 {
    font-size: 2.5rem;
  }
}