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

body {
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
  line-height: 1.6;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 8%;
  background: #ffffff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.logo {
  font-size: 22px;
  font-weight: 700;
  color: #2563eb;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: #374151;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 6px;
}

.nav-links a:hover,
.nav-links a.active {
  background: #e8f0ff;
  color: #2563eb;
}

.menu-btn {
  display: none;
  border: none;
  background: none;
  font-size: 26px;
  cursor: pointer;
}

.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
  min-height: 80vh;
  padding: 70px 8%;
}

.tag {
  color: #2563eb;
  font-weight: 700;
  margin-bottom: 10px;
}

.hero h1 {
  font-size: 56px;
  color: #111827;
}

.hero h2 {
  font-size: 24px;
  color: #4b5563;
  margin: 10px 0 20px;
}

.hero p {
  max-width: 600px;
}

.hero-buttons {
  margin-top: 28px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 6px;
  font-weight: 700;
  transition: 0.2s;
}

.btn.primary {
  background: #2563eb;
  color: white;
}

.btn.primary:hover {
  background: #1d4ed8;
}

.btn.secondary {
  background: white;
  color: #2563eb;
  border: 1px solid #2563eb;
}

.btn.secondary:hover {
  background: #e8f0ff;
}

.profile-card {
  background: white;
  padding: 36px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.avatar {
  width: 130px;
  height: 130px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #14b8a6);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 38px;
  font-weight: 700;
}

.section {
  padding: 40px 8%;
}

.section h2,
.page-header h1 {
  margin-bottom: 18px;
  color: #111827;
}

.card,
.skill-card,
.activity-card {
  background: white;
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.09);
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.skill-card {
  text-align: center;
  font-weight: 700;
  color: #2563eb;
}

.page-header {
  padding: 70px 8% 30px;
}

.page-header p {
  color: #4b5563;
}

.activity-list {
  padding: 20px 8% 70px;
  display: grid;
  gap: 22px;
}

.activity-card {
  transition: 0.2s;
}

.activity-card:hover {
  transform: translateY(-4px);
}

.activity-card h2 {
  margin: 8px 0;
  color: #111827;
}

.date {
  color: #2563eb;
  font-weight: 700;
}

.chip {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 12px;
  background: #e8f0ff;
  color: #2563eb;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
}

footer {
  text-align: center;
  padding: 24px;
  background: #ffffff;
  color: #6b7280;
}

@media (max-width: 768px) {
  .menu-btn {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    right: 8%;
    flex-direction: column;
    background: white;
    width: 180px;
    padding: 14px;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  }

  .nav-links.show {
    display: flex;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 50px;
    text-align: center;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero p {
    margin: 0 auto;
  }

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

  .skill-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 34px;
  }

  .skill-grid {
    grid-template-columns: 1fr;
  }

  .profile-card {
    padding: 26px;
  }
}