/* Base */
:root {
  /* Colors */
  --primary: #007bff;
  --primary-hover: #0056b3;
  --secondary: #28a745;
  --secondary-hover: #218838;
  --dark: #343a40;
  --light: #f8f9fa;
  --gray: #6c757d;
  --gray-light: #f1f3f5;
  --gray-dark: #343a40;
  --white: #ffffff;
  --black: #000000;
  
  /* Fonts */
  --font-family: 'Inter', sans-serif;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  
  /* Transitions */
  --transition: all 0.3s ease;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 1rem;
  --spacing-4: 1.5rem;
  --spacing-5: 3rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--dark);
  line-height: 1.6;
  font-size: 16px;
  background-color: var(--white);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-3);
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-3);
}

/* Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-3);
}

.text-primary {
  color: var(--primary);
}

.text-secondary {
  color: var(--secondary);
}

.rounded-image {
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

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

.btn--secondary:hover {
  background-color: var(--secondary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

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

.btn--light:hover {
  background-color: var(--light);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

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

.btn--outline:hover {
  background-color: var(--primary);
  color: var(--white);
  transform: translateY(-3px);
}

.btn--full {
  width: 100%;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--white);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  padding: 0rem;
  box-shadow: var(--shadow);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0rem var(--spacing-3);
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo .logo {
  height: 3rem;
  margin-right: var(--spacing-2);
}

.header__logo span {
  font-weight: 700;
  font-size: 1.25rem;
}

.header__nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  margin-right: var(--spacing-4);
}

.nav__link {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
  color: var(--dark);
}

.nav__link:hover,
.nav__link.active {
  color: var(--primary);
}

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 85%;
}

.header__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.header__toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--dark);
  margin: 5px 0;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--white);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  padding: 1rem 0;
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
}

.mobile-nav__link {
  display: block;
  padding: 0.75rem 1rem;
  font-weight: 500;
  transition: var(--transition);
}

.mobile-nav__link:hover {
  background-color: var(--gray-light);
  color: var(--primary);
}

.mobile-nav .btn {
  margin: var(--spacing-2) 0;
  width: 100%;
}

/* Main Content */
main {
  padding-top: 80px; /* Header height */
}

/* Sections */
.section {
  padding: var(--spacing-5) 0;
}

.section--light {
  background-color: var(--gray-light);
}

.section--primary {
  background-color: var(--primary);
  color: var(--white);
}

.section__header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-5) auto;
}

.section__header-line {
  width: 80px;
  height: 4px;
  background-color: var(--secondary);
  margin: var(--spacing-3) auto;
}

/* Hero Section */
.hero {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  background: linear-gradient(to bottom right, rgba(240, 249, 255, 0.8), rgba(240, 255, 245, 0.8));
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-5);
  align-items: center;
}

.hero__text h1 {
  margin-bottom: var(--spacing-3);
}

.hero__text p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-4);
}

.hero__buttons {
  display: flex;
  gap: var(--spacing-3);
}

.hero__image {
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.features {
  margin-top: var(--spacing-5);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
}

.feature-card {
  background-color: var(--white);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.feature-card__icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: rgba(0, 123, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--spacing-3);
}

.feature-card__icon i {
  color: var(--primary);
  font-size: 1.5rem;
}

.feature-card__icon--green {
  background-color: rgba(40, 167, 69, 0.1);
}

.feature-card__icon--green i {
  color: var(--secondary);
}

/* About Section */
.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-5);
  align-items: center;
}

.about__image {
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.about__features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-3);
  margin: var(--spacing-4) 0;
}

.about-feature {
  display: flex;
  align-items: center;
}

.about-feature i {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: rgba(0, 123, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-right: var(--spacing-2);
  color: var(--primary);
}

/* Services Section */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
}

.service-card {
  background-color: var(--white);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 4px solid var(--primary);
}

.service-card--secondary {
  border-top-color: var(--secondary);
}

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

.service-card__icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background-color: rgba(0, 123, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--spacing-3);
}

.service-card__icon i {
  color: var(--primary);
  font-size: 1.75rem;
}

.service-card__icon--green {
  background-color: rgba(40, 167, 69, 0.1);
}

.service-card__icon--green i {
  color: var(--secondary);
}

.service-card h3 {
  margin-bottom: var(--spacing-2);
}

.service-card__list {
  margin: var(--spacing-3) 0;
}

.service-card__list li {
  margin-bottom: var(--spacing-1);
  position: relative;
  padding-left: 20px;
}

.service-card__list li::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary);
}

.service-card__list--green li::before {
  background-color: var(--secondary);
}

.service-card__link {
  display: inline-flex;
  align-items: center;
  color: var(--primary);
  font-weight: 600;
  transition: var(--transition);
}

.service-card__link i {
  margin-left: var(--spacing-1);
  transition: var(--transition);
}

.service-card__link:hover {
  color: var(--primary-hover);
}

.service-card__link:hover i {
  transform: translateX(5px);
}

.service-card__link--green {
  color: var(--secondary);
}

.service-card__link--green:hover {
  color: var(--secondary-hover);
}

/* CTA Section */
.cta {
  text-align: center;
  background: linear-gradient(45deg, var(--primary), #0096ff);
}

.cta__content {
  max-width: 700px;
  margin: 0 auto;
}

.cta__content h2 {
  margin-bottom: var(--spacing-2);
}

.cta__content p {
  margin-bottom: var(--spacing-4);
  font-size: 1.25rem;
}

/* Contact Section */
.contact__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-5);
}

.contact-item {
  display: flex;
  margin-bottom: var(--spacing-4);
}

.contact-item__icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: rgba(0, 123, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-right: var(--spacing-3);
  color: var(--primary);
  flex-shrink: 0;
}

.contact-item__content h4 {
  margin-bottom: 0.25rem;
}

.contact-item__content a {
  color: var(--primary);
  transition: var(--transition);
}

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

.form-group {
  margin-bottom: var(--spacing-3);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-1);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

/* Footer */
.footer {
  background-color: var(--dark);
  color: var(--light);
  padding-top: var(--spacing-5);
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
  padding-bottom: var(--spacing-5);
}

.footer__logo {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-3);
}

.footer__logo .logo {
  height: 2.5rem;
  margin-right: var(--spacing-2);
}

.footer__logo span {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--white);
}

.footer__social {
  display: flex;
  margin-top: var(--spacing-3);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  margin-right: var(--spacing-2);
  color: var(--white);
  transition: var(--transition);
}

.footer__social a:hover {
  background-color: var(--primary);
  transform: translateY(-3px);
}

.footer__links h4,
.footer__contact h4 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-3);
  position: relative;
  padding-bottom: var(--spacing-2);
}

.footer__links h4::after,
.footer__contact h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 2px;
  background-color: var(--secondary);
}

.footer__links ul li {
  margin-bottom: var(--spacing-1);
}

.footer__links ul li a {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer__links ul li a:hover {
  color: var(--white);
  padding-left: 5px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-2);
}

.footer-contact-item i {
  margin-right: var(--spacing-2);
  color: var(--secondary);
}

.footer-contact-item a {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

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

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-3) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__bottom p {
  margin-bottom: 0;
}

.footer__bottom-links a {
  color: rgba(255, 255, 255, 0.7);
  margin-left: var(--spacing-2);
  transition: var(--transition);
}

.footer__bottom-links a:hover {
  color: var(--white);
}

/* Scroll Animation */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile Responsive */
@media (max-width: 992px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero__content, 
  .about__content,
  .contact__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .hero__image {
    order: -1;
  }
  
  .features,
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer__content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
  }
  
  .header__toggle {
    display: block;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .features,
  .services__grid {
    grid-template-columns: 1fr;
  }
  
  .hero__buttons {
    flex-direction: column;
    gap: var(--spacing-2);
  }
  
  .btn {
    width: 100%;
  }
  
  .footer__content {
    grid-template-columns: 1fr;
  }
  
  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .footer__bottom-links {
    margin-top: var(--spacing-2);
  }
  
  .footer__bottom-links a {
    margin: 0 var(--spacing-1);
  }
}

/* Custom css */

#backToTop {
    position: fixed;
    right: 20px;
    bottom: 20px;
    border-radius: 100%;
    width: 48px;
    height: 48px;
    border: none;
    background: #007bff;
    color: white;
}

.opacity-0.invisible {
    opacity: 0;
    visibility: hidden;
}

.opacity-100.visible {
    visibility: visible;
    opacity: 1;
}

#backToTop > i {
    font-size: 25px;
}

#backToTop:hover {
    cursor: pointer;
}