/* --- DESIGN SYSTEM & VARIABLES --- */
:root {
  /* Colors */
  --color-primary: #0A2540;
  /* Dark Blue */
  --color-secondary: #00C2FF;
  /* Tech Blue */
  --color-accent: #FFB703;
  /* STEM Yellow */
  --color-bg: #F8F9FA;
  /* Light Gray Background */
  --color-text-dark: #333333;
  --color-text-light: #FFFFFF;
  --color-gray: #6C757D;
  --color-light-gray: #E9ECEF;
  --color-border: #DEE2E6;

  /* Typography */
  /* Using Google Fonts imported in HTML */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Open Sans', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  /* 8px */
  --spacing-sm: 1rem;
  /* 16px */
  --spacing-md: 2rem;
  /* 32px */
  --spacing-lg: 4rem;
  /* 64px */
  --spacing-xl: 6rem;
  /* 96px */

  /* Border Radius & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
}

/* --- RESET & GLOBAL STYLES --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

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

a:hover {
  color: var(--color-primary);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- LAYOUT UTILITIES --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.section {
  padding: var(--spacing-lg) 0;
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.justify-between {
  justify-content: space-between;
}

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

.align-center {
  align-items: center;
}

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

/* --- BUTTONS --- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-text-light);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

.btn-accent:hover {
  background-color: #e6a500;
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* --- NAVBAR --- */
.navbar {
  background-color: var(--color-text-light);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-logo span {
  color: var(--color-secondary);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  font-weight: 600;
  color: var(--color-text-dark);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-secondary);
}

/* Ensure button text remains light even if it has the nav-link class */
.nav-link.btn-primary {
  color: var(--color-text-light);
}

.nav-link.btn-primary:hover,
.nav-link.btn-primary.active {
  color: var(--color-text-light);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
}

/* --- HERO SECTION --- */
.hero {
  background: linear-gradient(rgba(10, 37, 64, 0.8), rgba(10, 37, 64, 0.9)), url('https://images.unsplash.com/photo-1581091226825-a6a2a5aee158?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover;
  color: var(--color-text-light);
  padding: var(--spacing-xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero h1 {
  color: var(--color-text-light);
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.8s ease-out;
}

.hero p.subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-light-gray);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  animation: fadeInUp 1s ease-out 0.4s both;
}

/* --- CARDS --- */
.card {
  background-color: var(--color-text-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  margin-bottom: var(--spacing-xs);
  font-size: 1.25rem;
}

.card-desc {
  color: var(--color-gray);
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 600;
}

.tag {
  background-color: var(--color-light-gray);
  color: var(--color-primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
}

/* --- SECTION HEADERS --- */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 2.5rem;
}

.section-header p {
  color: var(--color-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* --- PROJECT FILTERS --- */
.project-filters {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--color-text-light);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-gray);
  transition: all var(--transition-normal);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: var(--color-text-light);
  border-color: var(--color-primary);
}

/* --- WHY CHOOSE US --- */
.feature-box {
  background: var(--color-text-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
}

.feature-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 3rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

/* --- ABOUT PAGE STYLES --- */
.about-hero {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.about-hero h1 {
  color: var(--color-text-light);
}

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

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.team-leader-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: var(--color-primary);
  font-weight: bold;
  padding: 5px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

@media (min-width: 769px) and (max-width: 888px) {
  .team-leader-badge {
    padding: 3px 10px;
    font-size: 0.8rem;
  }
}

/* --- CONTACT PAGE STYLES --- */
.contact-wrapper {
  background: var(--color-text-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.contact-form {
  padding: var(--spacing-lg);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(0, 194, 255, 0.1);
}

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

.contact-info {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--spacing-lg);
}

.contact-info h3 {
  color: var(--color-text-light);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.info-item i {
  font-size: 1.5rem;
  color: var(--color-secondary);
}

.map-container {
  width: 100%;
  height: 250px;
  background-color: var(--color-light-gray);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  overflow: hidden;
}

/* --- CALL TO ACTION --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a436a 100%);
  color: var(--color-text-light);
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.cta-section h2 {
  color: var(--color-text-light);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

/* --- FOOTER --- */
.footer {
  background-color: #051322;
  /* Darker than primary */
  color: var(--color-light-gray);
  padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

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

.footer-links li {
  margin-bottom: var(--spacing-xs);
}

.footer-links a {
  color: var(--color-light-gray);
}

.footer-links a:hover {
  color: var(--color-secondary);
  padding-left: 5px;
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: var(--color-text-light);
  transition: all var(--transition-normal);
}

.social-links a:hover {
  background-color: var(--color-secondary);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
}

/* --- ANIMATIONS --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

/* --- MEDIA QUERIES --- */
@media (max-width: 992px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-text-light);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
    transition: clip-path var(--transition-normal);
  }

  .nav-menu.active {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }

  .nav-logo,
  .footer-col {
    justify-content: center;
  }
}