:root {
  /* Colors */
  --bg-dark: #0f1115;
  --bg-card: #1a1d24;
  --text-light: #f3f4f6;
  --text-muted: #9ca3af;
  --accent-primary: #00E5FF; /* Electric Blue */
  --accent-hover: #00b8cc;
  
  /* Fonts */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Poppins', sans-serif;

  /* Spacing & Layout */
  --section-padding: 5rem 2rem;
  --max-width: 1200px;
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
}

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

ul {
  list-style: none;
}

/* Typography Utilities */
.text-accent {
  color: var(--accent-primary);
}
.text-center {
  text-align: center;
}
.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-inline: auto;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  font-family: var(--font-heading);
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--bg-dark);
  box-shadow: 0 4px 15px rgba(0, 229, 255, 0.3);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.5);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: rgba(0, 229, 255, 0.1);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 0.5rem 2rem;
  background-color: rgba(15, 17, 21, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.logo img {
  height: 130px; /* Huge size for framing the section */
  width: auto;
  display: block;
}

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

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
}

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

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

.starfield {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -3; /* behind watermark and everything else */
  pointer-events: none;
}

.hero-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 150vw; /* Very large to occupy almost the entire background */
  max-width: 2500px;
  height: auto;
  opacity: 0.05;
  z-index: -2;
  pointer-events: none;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  max-width: 100%;
  margin-inline: auto;
}

.hero .hero-subtitle {
  font-size: 1.8rem;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--text-light);
  margin-bottom: 1rem;
  max-width: 100%;
  margin-inline: auto;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 100%;
  margin-inline: auto;
}

/* About Section */
.about .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-content h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.about-content p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.about-visual {
  position: relative;
  height: 400px;
  background-color: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.about-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.about-visual:hover img {
  transform: scale(1.05);
}

/* Services Section */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--bg-card);
  padding: 2.5rem;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-10px);
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

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

.service-icon {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.service-card p {
  color: var(--text-muted);
}

/* Portfolio Section */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.portfolio-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  height: 300px;
  background-color: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.05);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  transition: var(--transition);
  text-decoration: none;
}

.portfolio-item:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
}

.portfolio-item h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-light);
}

.portfolio-item p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Testimonials Section */
.testimonials {
  background-color: var(--bg-card);
  text-align: center;
}

.testimonial-carousel {
  max-width: 800px;
  margin: 0 auto 3rem;
  padding: 2rem;
  background: rgba(255,255,255,0.02);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.05);
}

.testimonial-text {
  font-size: 1.25rem;
  font-style: italic;
  margin-bottom: 1.5rem;
}

.testimonial-author {
  font-weight: 600;
  color: var(--accent-primary);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.8);
  backdrop-filter: blur(5px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-dark);
  padding: 3rem;
  border-radius: var(--radius);
  width: 100%;
  max-width: 500px;
  position: relative;
  border: 1px solid rgba(255,255,255,0.1);
}

.close-modal {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}

.close-modal:hover {
  color: var(--accent-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  background-color: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--text-light);
  font-family: var(--font-body);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: rgba(255,255,255,0.08);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  background-color: var(--bg-dark);
  padding-top: 5rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.footer-brand p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255,255,255,0.05);
  transition: var(--transition);
}

.social-links a:hover {
  background-color: var(--accent-primary);
  color: var(--bg-dark);
}

.footer-bottom {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid rgba(255,255,255,0.05);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .about .grid, .footer-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none; /* In a real app, add a hamburger menu */
  }
  .section-padding {
    padding: 3rem 1rem;
  }
}

/* Demo specific styles */
.demo-header {
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 2rem;
}
.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.back-link:hover {
  color: var(--accent-primary);
}