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

body {
  font-family: Arial, sans-serif;
  color: #1f2937;
  line-height: 1.7;
  background: #ffffff;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

.narrow {
  max-width: 850px;
}

.topbar {
  background: white;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-photo {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  object-fit: cover;
}

.logo {
  color: #c5050c;
  font-size: 1.4rem;
}

.mini-title {
  font-size: 0.9rem;
  color: #6b7280;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

nav a {
  text-decoration: none;
  color: #374151;
  font-weight: 600;
}

nav a:hover {
  color: #c5050c;
}

.hero {
  padding: 5rem 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.tag {
  color: #c5050c;
  font-weight: bold;
  margin-bottom: 1rem;
}

.hero-text h2 {
  font-size: 3rem;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.intro {
  color: #4b5563;
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.primary-btn,
.secondary-btn {
  display: inline-block;
  padding: 0.9rem 1.4rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.primary-btn {
  background: #c5050c;
  color: white;
}

.secondary-btn {
  border: 1px solid #c5050c;
  color: #c5050c;
}

.hero-image img {
  width: 100%;
  max-width: 450px;
  border-radius: 24px;
  display: block;
  margin: auto;
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.section {
  padding: 5rem 0;
}

.gray-section {
  background: #f8fafc;
}

.section h2 {
  font-size: 2.2rem;
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.card,
.publication {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
}

.card h3,
.publication h3 {
  margin-bottom: 1rem;
}

.blog-header {
  padding: 5rem 0 3rem;
  background: #f8fafc;
  text-align: center;
}

footer {
  background: #111827;
  color: white;
  text-align: center;
  padding: 2rem 0;
}

@media (max-width: 900px) {

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

  .hero-text h2 {
    font-size: 2.2rem;
  }

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

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

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .brand {
    flex-direction: column;
  }
}