:root {
  /* Color Palette - Light Theme */
  --primary: #4f46e5; /* Indigo 600 */
  --primary-hover: #4338ca;
  --secondary: #8b5cf6; /* Violet 500 */
  --accent: #06b6d4; /* Cyan 500 */
  --bg-main: #f8fafc; /* Slate 50 */
  --card-bg: #ffffff; /* White */
  --text-main: #0f172a; /* Slate 900 */
  --text-muted: #64748b; /* Slate 500 */
  --border: #e2e8f0; /* Slate 200 */
  --header-bg: rgba(255, 255, 255, 0.9);

  /* Spacing */
  --container-width: 1200px;

  /* Effects */
  --glow: 0 0 20px rgba(79, 70, 229, 0.3);
  --glass: rgba(255, 255, 255, 0.8);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 2.5rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.75rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

/* Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  border: none;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.6);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background: var(--card-bg);
  border-color: var(--primary);
}

.text-gradient {
  background: linear-gradient(to right, #818cf8, #c084fc, #22d3ee);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 15px 0px;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: baseline;
}

.nav-links a:hover {
  color: var(--accent);
}

/* Sections */
section {
  padding: 5rem 0;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(79, 70, 229, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 70, 229, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center top;
  z-index: -1;
  mask-image: radial-gradient(circle at center, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 80%);
}

.hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(79, 70, 229, 0.1) 0%,
    transparent 70%
  );
  filter: blur(80px);
  z-index: -2;
}

.tech-text {
  font-family: 'Courier New', Courier, monospace;
  letter-spacing: -0.05em;
  color: var(--primary);
  opacity: 0.8;
}

.hero-content {
  max-width: 600px;
  flex: 1;
  padding-right: 2rem;
}

.hero-badges {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--primary);
  border-radius: 4px; /* Sharper corners for robotic feel */
  font-size: 0.8rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  font-family: 'Courier New', Courier, monospace; /* Tech font */
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-visual {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Grid */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    margin: 0 auto;
    padding-right: 0;
  }
  .hero-visual {
    width: 100%;
    margin-top: 3rem;
  }
  h1 {
    font-size: 2.5rem;
  }
  .nav-links {
    display: none;
  } /* Mobile menu simplified for now */
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: 16px;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  margin-top: 5rem;
  text-align: center;
  color: var(--text-muted);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.back-to-top:hover {
  background: var(--primary-hover);
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.6);
}