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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  line-height: 1.6;
  color: #2d3748;
  background-color: black;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 50px;
}

.container ul {
  display: inline-block; /* shrink ul to fit its content */
  text-align: left; /* keep bullets + text aligned */
  margin: 20px auto; /* center the block itself */
  padding-left: 20px; /* Adjust Bullet Indent */
  color: black; /* Text Color*/
  font-size: 18px;
}

.container ol {
  display: inline-block; /* shrink ul to fit its content */
  text-align: left; /* keep bullets + text aligned */
  padding-left: 30px; /* Adjust Bullet Indent */
  color: black; /* Text Color*/
}

/* Header */
header {
  background-color: black;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: #2563eb;
}

.cta-button {
  background-color: #2563eb;
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.cta-button:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

/* Hero section */
.hero {
  background:
    linear-gradient(
      135deg,
      rgba(37, 99, 235, 0.85) 0%,
      rgba(156, 188, 241, 0.85) 100%
    ),
    url("images_main/node_graph.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  max-width: 1200px;
  margin: 0 auto; /* centers horizontally */
  color: white;
  text-align: center;
  padding: 50px 50px;
  border-radius: 20px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 48px);
  margin-bottom: 20px;
  font-weight: 700;
}

.hero p {
  font-size: clamp(18px, 3vw, 24px);
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.95;
}

/* Features section */
.features {
  padding: 80px 20px;
  background-color: black;
}

.features h2 {
  text-align: center;
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 10px;
  color: white;
  font-weight: 700;
}

.features h3 {
  text-align: left;
  font-size: 20px;
  margin-bottom: 10px;
  color: white;
  font-weight: 700;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.feature-item {
  background: linear-gradient(135deg, #2563eb 0%, #9cbcf1 100%);
  padding: 25px;
  border-radius: 12px;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
  overflow: hidden;
}

.feature-item:hover {
  transform: scale(1.05); /* grows 5% larger */
  transition: transform 0.2s ease; /* smooth animation */
}

.feature-item h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: white;
  font-weight: 600;
}

.feature-item p {
  font-size: 18px;
  margin-bottom: 20px;
  color: black;
  font-style: italic;
}

.feature-image {
  width: 100%; /* take full width of tile */
  aspect-ratio: 1 / 1; /* or 4/3, or 1/1 for square */
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden; /* keeps image inside the box */
  border: 2px dashed #cbd5e1;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  background-color: white;
}

.feature-image img,
.feature-image video {
  width: 100%;
  height: 100%;
  object-fit: fill; /* crop to fill the box */
  display: block;
}

/* Verification Problems */
.verification {
  padding: 80px 20px;
  background: linear-gradient(135deg, #2563eb 0%, #9cbcf1 100%);
  max-width: 400px;
  margin: 0 auto; /* centers horizontally */
  text-align: center;
  border-radius: 20px;
}

.verification h2 {
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 20px;
  color: white;
  font-weight: 700;
}

.verification p {
  font-size: 18px;
  margin-bottom: 30px;
  color: white;
}

/* Demo section */
.demo {
  padding: 80px 20px;
  background: linear-gradient(135deg, #2563eb 0%, #9cbcf1 100%);
  max-width: 1200px;
  margin: 0 auto; /* centers horizontally */
  text-align: center;
  border-radius: 20px;
}

.demo h2 {
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 20px;
  color: white;
  font-weight: 700;
}

.demo p {
  font-size: 18px;
  margin-bottom: 30px;
  color: white;
  text-align: center;
}

.demo video {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* Footer */
footer {
  background-color: black;
  color: #64748b;
  text-align: center;
  padding: 30px;
}

footer a {
  color: #2563eb;
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
  .hero {
    padding: 80px 20px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  nav {
    padding: 12px 0;
  }

  .feature-item {
    padding: 20px;
  }
}

/* Footer CSS */
.footer__container {
  background-color: #131313;
  padding: 5rem 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#footer__logo {
  color: #fff;
  display: flex;
  align-items: center;
  cursor: pointer;
  text-decoration: none;
  font-size: 2rem;
}

.footer__links {
  width: 100%;
  max-width: 1000px;
  display: flex;
  justify-content: center;
}

.footer__link--wrapper {
  display: flex;
}

.footer__link--items {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin: 16px;
  text-align: left;
  width: 160px;
  box-sizing: border-box;
}

.footer__link--items h2 {
  margin-bottom: 16px;
  color: #fff;
}

.footer__link--items a {
  color: #fff;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: 0.3 ease-out;
}

.footer__link--items a:hover {
  color: #e9e9e9;
  transition: 0.3 ease-out;
}

.social__icon--link {
  color: #fff;
  font-size: 24px;
}

.social__media {
  max-width: 1000px;
  width: 100%;
}

.social__media--wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  max-width: 1000px;
  margin: 40px auto 0 auto;
}

.social__icons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 240px;
}

.website__rights {
  color: #fff;
}

@media screen and (max-width: 820px) {
  .footer__links {
    padding-top: 2rem;
  }

  #footer__logo {
    margin-bottom: 2rem;
  }

  .website__rights {
    margin-bottom: 2rem;
  }

  .footer__link--wrapper {
    flex-direction: column;
  }

  .social__media--wrap {
    flex-direction: column;
  }
}

@media screen and (max-width: 480px) {
  .footer__link--items {
    margin: 0;
    padding: 10px;
    width: 100%;
  }
}