/* ===== CSS Variables ===== */
:root {
  /* Tetrad Color Scheme */
  --primary-color: #3498db;
  --primary-dark: #2980b9;
  --primary-light: #5dade2;
  
  --secondary-color: #e74c3c;
  --secondary-dark: #c0392b;
  --secondary-light: #ec7063;
  
  --tertiary-color: #2ecc71;
  --tertiary-dark: #27ae60;
  --tertiary-light: #58d68d;
  
  --quaternary-color: #f39c12;
  --quaternary-dark: #d35400;
  --quaternary-light: #f8c471;
  
  /* Neutral Colors */
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --medium-gray: #e9ecef;
  --dark-gray: #343a40;
  --black: #000000;
  
  /* Typography */
  --heading-font: 'Raleway', sans-serif;
  --body-font: 'Open Sans', sans-serif;
  
  /* Spacing */
  --section-spacing: 5rem;
  --element-spacing: 1.5rem;
  
  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-xl: 2rem;
  
  /* Shadows */
  --shadow-sm: 0 .125rem .25rem rgba(0,0,0,.075);
  --shadow-md: 0 .5rem 1rem rgba(0,0,0,.15);
  --shadow-lg: 0 1rem 3rem rgba(0,0,0,.175);
  
  /* Transitions */
  --transition-fast: 0.3s ease;
  --transition-medium: 0.5s ease;
  --transition-slow: 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===== Global Styles ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  color: var(--dark-gray);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.5rem;
}

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

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

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

section {
  padding: 5rem 0;
  position: relative;
}

/* ===== Biomorphic Elements ===== */
.biomorphic-shape {
  position: absolute;
  z-index: 0;
  opacity: 0.1;
  pointer-events: none;
}

.shape-1 {
  width: 300px;
  height: 300px;
  border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%;
  background: var(--primary-color);
  top: -150px;
  left: -150px;
  animation: morph 15s linear infinite alternate;
}

.shape-2 {
  width: 200px;
  height: 200px;
  border-radius: 38% 62% 63% 37% / 41% 44% 56% 59%;
  background: var(--secondary-color);
  bottom: -100px;
  right: -100px;
  animation: morph 15s linear infinite alternate-reverse;
}

.shape-3 {
  width: 250px;
  height: 250px;
  border-radius: 46% 54% 43% 57% / 40% 35% 65% 60%;
  background: var(--tertiary-color);
  top: 40%;
  right: -125px;
  animation: morph 15s linear infinite alternate;
}

.shape-4 {
  width: 350px;
  height: 350px;
  border-radius: 59% 41% 40% 60% / 46% 51% 49% 54%;
  background: var(--quaternary-color);
  bottom: 10%;
  left: -175px;
  animation: morph 15s linear infinite alternate-reverse;
}

@keyframes morph {
  0% {
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  }
  50% {
    border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
  }
  100% {
    border-radius: 40% 60% 70% 30% / 40% 40% 60% 50%;
  }
}

/* ===== Header ===== */
header {
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.navbar {
  padding: 1rem 0;
  transition: var(--transition-fast);
}

.navbar-brand {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary-dark);
}

.navbar-brand:hover {
  color: var(--primary-color);
}

.nav-link {
  font-weight: 500;
  margin: 0 0.5rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-medium);
}

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

.navbar-toggler {
  border: none;
  padding: 0.25rem 0.5rem;
}

.navbar-toggler:focus {
  box-shadow: none;
  outline: none;
}

/* ===== Buttons ===== */
.btn {
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  transition: all var(--transition-medium);
  border: none;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transition: all var(--transition-medium);
  z-index: -1;
}

.btn:hover:before {
  width: 100%;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

.btn-secondary {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
}

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  border-color: var(--secondary-dark);
}

.btn-outline-secondary {
  color: var(--secondary-color);
  border-color: var(--secondary-color);
}

.btn-outline-secondary:hover {
  background-color: var(--secondary-color);
  color: var(--white);
}

.btn-outline-light {
  color: var(--white);
  border-color: var(--white);
}

.btn-outline-light:hover {
  background-color: var(--white);
  color: var(--primary-color);
}

/* ===== Hero Section ===== */
#hero {
  position: relative;
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  color: var(--white);
  overflow: hidden;
}

#hero .overlay {
  top: 0;
  left: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.7), rgba(0,0,0,0.3));
}

#hero h1 {
  font-weight: 700;
  margin-bottom: 1.5rem;
  animation: fadeInUp 1s ease-out;
}

#hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease-out 0.3s;
  animation-fill-mode: both;
}

#hero .btn {
  animation: fadeInUp 1s ease-out 0.6s;
  animation-fill-mode: both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== About Section ===== */
#about {
  position: relative;
  overflow: hidden;
}

.image-container {
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-medium);
}

.image-container:hover {
  transform: translateY(-5px);
}

.image-container img {
  transition: transform var(--transition-slow);
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-container:hover img {
  transform: scale(1.05);
}

/* ===== Mission Section ===== */
#mission {
  position: relative;
  overflow: hidden;
}

/* ===== Methodology Section ===== */
#methodology {
  position: relative;
}

#methodology .card {
  height: 100%;
  transition: transform var(--transition-medium);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#methodology .card:hover {
  transform: translateY(-10px);
}

#methodology .card-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
}

#methodology .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

#methodology .card:hover .card-image img {
  transform: scale(1.1);
}

#methodology .card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* ===== Features Section ===== */
#features {
  position: relative;
}

#features .card {
  height: 100%;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#features .card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

#features .card-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
}

#features .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

#features .card:hover .card-image img {
  transform: scale(1.1);
}

/* ===== Process Section ===== */
#process {
  position: relative;
}

#process .card {
  height: 100%;
  transition: all var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

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

.process-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background-color: var(--primary-color);
  color: var(--white);
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto;
}

/* ===== Research Section ===== */
#research {
  position: relative;
}

/* ===== Projects/Vehicles Section ===== */
#projects {
  position: relative;
}

#projects .card {
  height: 100%;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#projects .card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

#projects .card-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
}

#projects .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

#projects .card:hover .card-image img {
  transform: scale(1.1);
}

#projects .card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: left;
}

/* ===== Customer Stories Section ===== */
#customer-stories {
  position: relative;
}

#customer-stories .card {
  height: 100%;
  transition: transform var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#customer-stories .card:hover {
  transform: translateY(-5px);
}

#customer-stories .card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

#customer-stories .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

#customer-stories .card:hover .card-image img {
  transform: scale(1.05);
}

/* ===== External Resources Section ===== */
#external-resources {
  position: relative;
}

#external-resources .card {
  height: 100%;
  transition: transform var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#external-resources .card:hover {
  transform: translateY(-5px);
}

.resource-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* ===== Careers Section ===== */
#careers {
  position: relative;
}

/* ===== Contact Section ===== */
#contact {
  position: relative;
}

#contact .card {
  height: 100%;
  transition: transform var(--transition-medium);
}

#contact .card:hover {
  transform: translateY(-5px);
}

#contact .form-control, #contact .form-select {
  padding: 0.75rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--medium-gray);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#contact .form-control:focus, #contact .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* ===== Footer ===== */
footer {
  position: relative;
  overflow: hidden;
}

footer h5 {
  position: relative;
  display: inline-block;
}

footer h5:after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -10px;
  height: 2px;
  width: 50px;
  background-color: var(--white);
}

footer a {
  transition: all var(--transition-fast);
  display: inline-block;
  position: relative;
}

footer a:hover {
  transform: translateX(5px);
  color: var(--primary-light) !important;
}

/* Social Links */
footer a.social-link {
  margin-right: 1rem;
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
}

footer a.social-link:hover {
  transform: translateY(-3px);
}

/* ===== Success Page ===== */
.success-page {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
  padding: 2rem;
}

.success-page .card {
  max-width: 600px;
  width: 100%;
  padding: 3rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.success-icon {
  font-size: 5rem;
  color: var(--tertiary-color);
  margin-bottom: 2rem;
}

/* ===== Privacy & Terms Pages ===== */
.privacy-page, .terms-page {
  padding-top: 100px;
}

/* ===== Animation Utilities ===== */
.fade-in {
  animation: fadeIn 1s ease-out;
}

.slide-up {
  animation: slideUp 1s ease-out;
}

.slide-right {
  animation: slideRight 1s ease-out;
}

.slide-left {
  animation: slideLeft 1s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideRight {
  from { transform: translateX(-50px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideLeft {
  from { transform: translateX(50px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ===== Media Queries ===== */
@media (max-width: 1199.98px) {
  :root {
    --section-spacing: 4rem;
  }
}

@media (max-width: 991.98px) {
  :root {
    --section-spacing: 3rem;
  }
  
  .navbar-nav {
    margin-top: 1rem;
  }
  
  .nav-link {
    margin: 0.25rem 0;
  }
  
  .process-number {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }
}

@media (max-width: 767.98px) {
  :root {
    --section-spacing: 2.5rem;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .image-container {
    margin-bottom: 2rem;
  }
}

@media (max-width: 575.98px) {
  :root {
    --section-spacing: 2rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .btn {
    width: 100%;
    margin-bottom: 0.5rem;
  }
}