* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

:root {
  --primary-white: #ffffff;
  --primary-black: #000000;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --accent-color: #4a5568;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.footer {
  background-color: black;
  color: var(--gray-300);
  padding: 5rem 0 2rem;
  width: 100%;
}

.section-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  width: 100%;
  margin: 0 auto;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--primary-white);
  margin-bottom: 1.5rem;
}

.footer-logo .logo-icon {
  color: var(--accent-color);
}

.footer-description {
  margin-bottom: 2rem;
  line-height: 1.8;
  color: var(--gray-400);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--gray-800);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  text-decoration: none;
  transition: var(--transition);
}

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

.social-link.houses:hover {
  background-color: #1877F2;
  color: white;
}

.social-link.facebook:hover {
  background-color: #1877F2;
  color: white;
}

.social-link.instagram:hover {
  background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
  color: white;
}

.social-link.whatsapp:hover {
  background-color: #25D366;
  color: white;
}

.footer-heading {
  color: var(--primary-white);
  font-size: 1.2rem;
  margin-bottom: 1.8rem;
  font-weight: 600;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--primary-white);
  transform: translateX(5px);
}

.certifications-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.certification-img {
  width: 100%;
  height: auto;
  background-color: var(--gray-800);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.certification-img:hover {
  transform: scale(1.03);
  background-color: var(--gray-700);
}

.certification-img img {
  max-width: 100%;
  height: auto;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

.developer-text {
  line-height: 1.6;
  color: var(--gray-400);
  font-size: 0.95rem;
}

.developer-text a {
  color: var(--primary-white);
  text-decoration: underline;
  font-weight: 600;
  transition: var(--transition);
}

.developer-text a:hover {
  color: var(--accent-color);
  transform: none;
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: 2rem;
  margin-top: 4rem;
  text-align: center;
  color: var(--gray-500);
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  font-size: 0.9rem;
}

.whatsapp-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  background-color: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: var(--transition);
  text-decoration: none;
  animation: float 3s ease-in-out infinite;
}

.whatsapp-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
  animation: none;
}

@media (max-width: 991px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
}

@media (max-width: 575px) {
  .section-container {
    padding: 0 4%;
  }
  .footer {
    padding: 4rem 0 1.5rem;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .whatsapp-btn {
    width: 55px;
    height: 55px;
    font-size: 1.7rem;
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

@media (max-width: 374px) {
  .footer {
    padding: 3rem 0 1rem;
  }
  .whatsapp-btn {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    bottom: 1rem;
    right: 1rem;
  }
}

@media (max-width: 319px) {
  .whatsapp-btn {
    width: 45px;
    height: 45px;
    font-size: 1.3rem;
  }
}

.playstore-link {
    display: inline-block;
    margin-top: 1.5rem;
    width: 100%;
    max-width: 200px;
    transition: var(--transition);
}

.playstore-link:hover {
    transform: translateY(-3px);
    opacity: 0.9;
}

.playstore-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

@media (max-width: 991px) {
    .playstore-link {
        max-width: 180px;
    }
}

@media (max-width: 575px) {
    .playstore-link {
        max-width: 160px;
    }
}

@media (max-width: 374px) {
    .playstore-link {
        max-width: 140px;
    }
}