/* CSS Reset & Custom Properties */
:root {
  /* Tech Corporate Color Palette */
  --color-primary: #0A192F;
  /* Deep tech blue */
  --color-primary-light: #172A45;
  --color-accent: #64FFDA;
  /* Cybernetic green/teal accent */
  --color-accent-hover: #4CD6B4;
  --color-text-main: #E6F1FF;
  --color-text-muted: #8892B0;
  --color-bg-dark: #020C1B;
  --color-card-bg: rgba(23, 42, 69, 0.7);

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing (Base 1rem = 16px) */
  --space-xs: 0.5rem;
  /* 8px */
  --space-sm: 1rem;
  /* 16px */
  --space-md: 2rem;
  /* 32px */
  --space-lg: 4rem;
  /* 64px */
  --space-xl: 6rem;
  /* 96px */

  /* Radii & Transitions */
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg-dark);
}

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

img,
svg {
  max-width: 100%;
  display: block;
}

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

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* ==================
   HEADER
   ================== */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
  padding: var(--space-sm) 0;
  transition: padding var(--transition-fast), background var(--transition-fast);
}

.header.scrolled {
  padding: var(--space-xs) 0;
  background: rgba(10, 25, 47, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.5px;
}

.logo-text::after {
  content: '.';
  color: var(--color-accent);
}

.header-actions {
  display: flex;
  gap: var(--space-sm);
}

/* ==================
   BUTTONS
   ================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg-dark);
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(100, 255, 218, 0.3);
}

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

.btn-outline:hover {
  background-color: rgba(100, 255, 218, 0.1);
  transform: translateY(-2px);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* ==================
   HERO SECTION
   ================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  /* Space for fixed header */
  background: url('hero-bg.png') center/cover no-repeat;
  /* Fallback color if image fails */
  background-color: var(--color-primary);
}

/* Create a dark overlay to ensure text contrast */
.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg,
      rgba(2, 12, 27, 0.95) 0%,
      rgba(10, 25, 47, 0.7) 100%);
  z-index: 1;
}

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

#hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  color: var(--color-text-main);
  animation: fadeUp 0.8s ease forwards;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  max-width: 600px;
  animation: fadeUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  margin-top: var(--space-md);
  animation: fadeUp 0.8s ease 0.4s forwards;
  opacity: 0;
}

/* ==================
   SERVICES SECTION
   ================== */
.services {
  padding: var(--space-xl) 0;
  position: relative;
  z-index: 2;
  background-color: var(--color-bg-dark);
}

.section-title {
  font-size: clamp(2rem, 3vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-text-main);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--color-accent);
  margin: var(--space-sm) auto 0;
  border-radius: 2px;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.service-card {
  background-color: var(--color-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.service-card:hover,
.service-card:focus-visible {
  transform: translateY(-5px);
  background-color: var(--color-primary-light);
  border-color: rgba(100, 255, 218, 0.3);
  box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  outline: none;
}

.service-icon {
  margin-bottom: var(--space-sm);
  color: var(--color-accent);
  transition: transform var(--transition-normal);
}

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

.service-card h3 {
  font-size: 1.4rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-main);
}

.service-card p {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: var(--space-lg);
  flex-grow: 1;
  /* Pushes the link to bottom */
}

.service-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
  margin-top: auto;
}

.arrow-icon {
  transition: transform var(--transition-normal);
}

.service-card:hover .arrow-icon {
  transform: translateX(5px);
}

/* ==================
   FOOTER
   ================== */
.footer {
  background-color: var(--color-primary);
  padding: var(--space-md) 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

/* ==================
   ANIMATIONS
   ================== */
@keyframes fadeUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================
   MEDIA QUERIES (Mobile-First approach implies designing upwards)
   ================== */

/* Tablet & Up */
@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Laptop & Desktop */
@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .header-container {
    flex-wrap: nowrap;
  }
}

/* Small Mobile Adjustments */
@media (max-width: 480px) {
  .header-actions {
    display: none;
    /* Hide header buttons on very small screens to save space */
  }

  .header-container {
    justify-content: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-content {
    text-align: center;
  }
}