/* ===================================
   EXERTIVE TECHNOLOGY LIMITED - Design System
   Inspired by Milton Park's professional aesthetic
   =================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Colors - Professional Blue & Green Palette */
  --primary-blue: hsl(210, 85%, 35%);
  --primary-blue-light: hsl(210, 85%, 45%);
  --primary-blue-dark: hsl(210, 85%, 25%);
  --accent-green: hsl(145, 65%, 45%);
  --accent-green-light: hsl(145, 65%, 55%);

  /* Neutral Colors */
  --white: #ffffff;
  --off-white: hsl(210, 20%, 98%);
  --light-gray: hsl(210, 15%, 92%);
  --medium-gray: hsl(210, 10%, 65%);
  --dark-gray: hsl(210, 15%, 25%);
  --text-dark: hsl(210, 20%, 15%);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-light) 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(30, 90, 150, 0.9) 0%, rgba(25, 135, 84, 0.8) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ===================================
   Global Resets & Base Styles
   =================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

/* ===================================
   Typography Styles
   =================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-dark);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--spacing-sm);
}

p {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  color: var(--dark-gray);
}

/* ===================================
   Navigation & Header
   =================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-blue);
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--primary-blue-light);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--dark-gray);
  font-weight: 500;
  font-size: 1rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-green);
  transition: width var(--transition-fast);
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  overflow: hidden;
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin-top: 70px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 90, 150, 0.9) 0%, rgba(25, 135, 84, 0.8) 100%), url('img/hero-bg.png');
  background-size: cover;
  background-position: center;
  z-index: 0;
}

@keyframes gridMove {
  0% {
    transform: translate(0, 0);
  }

  100% {
    transform: translate(40px, 40px);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  text-align: center;
  color: var(--white);
  animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 5rem);
  margin-bottom: var(--spacing-md);
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: rgba(255, 255, 255, 0.95);
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  font-family: var(--font-primary);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--white);
  color: var(--primary-blue);
  box-shadow: var(--shadow-lg);
}

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

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

.btn-secondary:hover {
  background: var(--white);
  color: var(--primary-blue);
  transform: translateY(-2px);
}

/* ===================================
   Sections
   =================================== */

.section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.section-alt {
  background: var(--off-white);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
}

.section-title {
  color: var(--primary-blue);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: var(--medium-gray);
}

/* ===================================
   Services Grid
   =================================== */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.service-card {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

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

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.service-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 2rem;
}

.service-card h3 {
  color: var(--primary-blue);
  margin-bottom: var(--spacing-sm);
}

.service-card p {
  color: var(--dark-gray);
  line-height: 1.7;
}

/* ===================================
   About Section
   =================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.about-text-block h3,
.about-features-block h3 {
  color: var(--primary-blue);
  margin-bottom: var(--spacing-sm);
  font-size: 1.75rem;
}

.about-image-block {
  position: relative;
}

.about-image-block img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-normal);
}

.about-image-block img:hover {
  transform: scale(1.02);
}

.rounded-image {
  border-radius: var(--radius-lg);
}

.about-features {
  display: grid;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.feature-item {
  display: flex;
  align-items: start;
  gap: var(--spacing-sm);
}

.feature-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--white);
  font-weight: bold;
}

.feature-text {
  flex: 1;
}

.feature-text h4 {
  color: var(--primary-blue);
  margin-bottom: 0.25rem;
  font-size: 1.125rem;
}

.feature-text p {
  margin: 0;
  font-size: 1rem;
  color: var(--dark-gray);
}

/* ===================================
   Contact Section
   =================================== */

.contact-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.contact-info {
  background: var(--gradient-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.contact-info::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.contact-info h3 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
  font-size: 2rem;
}

.contact-item {
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.contact-item h4 {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.contact-item a {
  color: var(--white);
  text-decoration: none;
  font-size: 1.125rem;
  transition: opacity var(--transition-fast);
  display: block;
  margin-bottom: 0.5rem;
}

.contact-item a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.contact-form {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  color: var(--primary-blue);
  margin-bottom: var(--spacing-lg);
  font-size: 2rem;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--dark-gray);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
  background: var(--off-white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(30, 90, 150, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.btn-submit {
  background: var(--gradient-primary);
  color: var(--white);
  width: 100%;
  padding: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ===================================
   Footer
   =================================== */

.footer {
  background: var(--text-dark);
  color: var(--white);
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-xs);
  transition: color var(--transition-fast);
  font-size: 1rem;
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9375rem;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-grid,
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .about-image-block.slide-in-right {
    order: -1;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

/* ===================================
   Animations & Utilities
   =================================== */

.fade-in {
  animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.slide-in-left {
  animation: slideInLeft 0.8s ease;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  animation: slideInRight 0.8s ease;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scroll reveal utility */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}