:root {
  --bg-color: #f4f7f9;
  --text-color: #333;
  --primary-color: #007acc;
  --card-bg-color: #ffffff;
  --header-bg-color: rgba(255, 255, 255, 0.85);
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --primary-color: #38bdf8;
  --card-bg-color: #1e1e1e;
  --header-bg-color: rgba(30, 30, 30, 0.85);
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.4);
}

[data-theme="blue-light"] {
  --bg-color: #fdf6e3;
  --text-color: #657b83;
  --primary-color: #268bd2;
  --card-bg-color: #f6efdf;
  --header-bg-color: rgba(246, 239, 223, 0.85);
  --border-color: #eee8d5;
  --shadow-color: rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Lato", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  font-family: "Montserrat", sans-serif;
  color: var(--text-color);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
  margin-top: 0;
}
h3 {
  font-size: 1.5rem;
}
h4 {
  font-size: 1.2rem;
  color: var(--text-color);
  opacity: 0.8;
}

ul {
  list-style-position: inside;
  padding-left: 1rem;
}

.main-header {
  background-color: var(--header-bg-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.main-title {
  font-size: 1.5rem;
  margin: 0;
}

.main-nav a {
  margin: 0 1rem;
  font-weight: 600;
  font-family: "Montserrat", sans-serif;
}

.theme-switcher {
  display: flex;
  gap: 0.5rem;
}

.theme-switcher button {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.theme-switcher button:hover {
  transform: scale(1.1);
  background-color: var(--card-bg-color);
}

.card {
  background-color: var(--card-bg-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px var(--shadow-color);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.card.visible {
  opacity: 1;
  transform: translateY(0);
}

#about .about-container {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.profile-picture {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-color);
  box-shadow: 0 4px 10px var(--shadow-color);
}

.about-text {
  flex: 1;
}

#about .social-networks {
  margin-top: 1.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

#about .social-networks img {
  height: 40px;
  width: auto;
  max-width: 60px;
  transition: transform 0.2s ease;
  border-radius: 4px;
}

#about .social-networks img:hover {
  transform: scale(1.15);
}

#skills .skill-category {
  margin-bottom: 2rem;
}

#skills .skills-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

#skills .skills-icons img {
  height: 40px;
  width: 40px;
  object-fit: contain;
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#skills .skills-icons img:hover {
  transform: scale(1.2) rotate(5deg);
}

.table-container {
  overflow-x: auto;
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th,
td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

thead th {
  background-color: var(--bg-color);
  color: var(--primary-color);
  font-weight: 700;
  font-family: "Montserrat", sans-serif;
}

tbody tr {
  transition: background-color 0.2s ease;
}

tbody tr:hover {
  background-color: var(--shadow-color);
}

.book-cover {
  max-width: 50px;
  height: auto;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.book-cover:hover {
  transform: scale(1.1);
}

.modal {
  display: none;
  position: fixed;
  z-index: 1001;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@keyframes zoom {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}

.close-button {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close-button:hover,
.close-button:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

#caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}

.main-footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-color);
  opacity: 0.7;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .main-header {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .main-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1rem;
  }

  .main-nav a {
    margin: 0;
  }

  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.75rem;
  }
  h3 {
    font-size: 1.3rem;
  }

  #about .about-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}