:root {
  --primary-color: #1e3a8a;
  --secondary-color: #3b82f6;
  --text-color: #333;
  --light-bg: #f5f6fa;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  background-color: var(--primary-color);
  color: white;
  padding: 3rem 0;
  text-align: center;
}

.profile-info {
  margin-bottom: 2rem;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.contact-info {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-info a {
  color: white;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

section {
  background: white;
  padding: 2rem;
  margin: 2rem 0;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--secondary-color);
  padding-bottom: 0.5rem;
}

.experience-item {
  margin-bottom: 1.5rem;
}

.experience-title {
  font-weight: bold;
  color: var(--secondary-color);
}

.experience-date {
  font-style: italic;
  color: #666;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.skill-category {
  margin-bottom: 1rem;
}

.skill-category h3 {
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

footer {
  text-align: center;
  padding: 2rem;
  background: var(--primary-color);
  color: white;
}

.error-page {
  text-align: center;
  padding: 3rem 2rem;
}

.error-page .error-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--secondary-color);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.error-page h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 1rem;
}

.error-page .error-description {
  color: #666;
  margin-bottom: 2rem;
}

.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  transition: background-color 0.2s;
}

.btn-home:hover {
  background-color: var(--secondary-color);
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .contact-info {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
}