:root {
  --font-primary: "Fira Sans", sans-serif;
  --font-secondary: "Lora", serif;
  --color-background: #f8f5ed;
  --color-background-gradient: radial-gradient(circle, #faf8f0 90%, #f8f5ed 100%);
  --color-surface: #ffffff;
  --color-primary: #030308;
  --color-secondary: #43abf6;
  --color-text: #333333;
  --color-text-light: #777777;
  --color-border: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.05);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  background: var(--color-background-gradient, var(--color-background));
  background-size: 200% 200%;
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  animation: subtle-gradient-animation 40s ease infinite;
  transition: none;
}

@keyframes subtle-gradient-animation {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

main {
  flex: 1;
}

h1,
h2,
h3 {
  font-family: var(--font-secondary);
  color: var(--color-primary);
  font-weight: 700;
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.25rem;
}

p {
  color: var(--color-text-light);
  line-height: 1.6;
}

header {
  padding: 2rem;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.theme-switcher {
  position: absolute;
  top: 50%;
  right: 2.5rem;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-switcher .ph {
  font-size: 1.5rem;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked+.slider {
  background-color: var(--color-secondary);
}

input:checked+.slider:before {
  transform: translateX(22px);
}

.feature,
.catalog,
.cta {
  padding: 4rem 2rem;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-image-wrapper {
  max-width: 700px;
  margin: 2rem auto;
}

.feature-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 1rem;
}

.cta-button {
  background: linear-gradient(135deg, var(--color-primary), #1a1a1a);
  border: 2px solid transparent;
  border-radius: 9999px;
  color: var(--color-surface);
  display: inline-block;
  margin: 2rem auto;
  padding: 1.25rem 2.5rem;
  text-decoration: none;
  text-transform: uppercase;
  font-weight: 700;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.cta-button:hover {
  transform: translateY(-5px) scale(1.05);
  background: linear-gradient(135deg, var(--color-secondary), #2563eb);
  color: white;
  box-shadow: 0 10px 25px rgba(67, 171, 246, 0.4);
}

.cta-button:hover::before {
  left: 100%;
}

.genres {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
  padding: 0;
}

.genres>li {
  margin: 0;
}

.genre>a,
.see-more>a {
  display: block;
  text-align: center;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
  border-radius: 9999px;
  color: white;
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
}

.genre>a::before,
.see-more>a::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background-color: var(--color-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.4s ease;
  z-index: -1;
}

.genre>a:hover,
.see-more>a:hover {
  color: var(--color-surface);
  border-color: var(--color-primary);
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 20px rgba(67, 171, 246, 0.4);
}

.genre>a:hover::before,
.see-more>a:hover::before {
  width: 300px;
  height: 300px;
}

.genre>a.active {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: bold;
  border-color: var(--color-primary);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 4rem;
  text-align: left;
}

.book-card {
  background-color: var(--color-surface);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px var(--shadow-color);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.book-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 25px 50px rgba(67, 171, 246, 0.15), 0 15px 35px var(--shadow-color);
}

.book-card-image-container {
  position: relative;
  width: 100%;
  height: 300px;
  background-color: var(--color-background);
  overflow: hidden;
}

.book-card-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: filter 0.4s ease, transform 0.4s ease;
}

.book-card-read-link {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, var(--color-secondary), #2563eb);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  text-decoration: none;
  font-weight: bold;
  text-transform: uppercase;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 4px 15px rgba(67, 171, 246, 0.4);
}

.book-card:hover .book-card-image {
  filter: blur(3px) brightness(0.7);
  transform: scale(1.1);
}

.book-card:hover .book-card-read-link {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1.05);
}

.book-card-content {
  padding: 1.5rem;
  flex-grow: 1;
  position: relative;
  transition: all 0.3s ease;
}

.book-card:hover .book-card-content {
  padding-top: 2rem;
}

.book-card-title {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
  font-weight: 600;
  line-height: 1.3;
}

.book-card:hover .book-card-title {
  color: var(--color-secondary);
}

.book-card-author {
  color: var(--color-text-light);
  font-size: 0.9rem;
  transition: color 0.3s ease;
  font-style: italic;
}

.book-card:hover .book-card-author {
  color: var(--color-text);
}

.form-page-main {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 150px);
  padding: 2rem 1rem;
}

.inscricao-form {
  background: var(--color-surface);
  border-radius: 1rem;
  padding: 3rem;
  max-width: 600px;
  width: 100%;
  box-shadow: 0 10px 40px var(--shadow-color);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.inscricao-form label {
  font-weight: bold;
  color: var(--color-primary);
}

.inscricao-form input,
.inscricao-form textarea {
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  font-size: 1rem;
  width: 100%;
  background-color: var(--color-background);
  color: var(--color-text);
}

.inscricao-form button {
  background: linear-gradient(135deg, var(--color-primary), #1a1a1a);
  color: var(--color-surface);
  border: 2px solid transparent;
  padding: 1.25rem;
  font-size: 1.1rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  text-transform: uppercase;
  font-weight: 700;
  position: relative;
  overflow: hidden;
}

.inscricao-form button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.inscricao-form button:hover {
  background: linear-gradient(135deg, var(--color-secondary), #2563eb);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 20px rgba(67, 171, 246, 0.3);
}

.inscricao-form button:hover::before {
  left: 100%;
}

.site-footer {
  background-color: var(--color-surface);
  color: var(--color-text-light);
  padding: 4rem 2rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-brand {
  font-family: var(--font-secondary);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.footer-social-icons {
  display: flex;
  gap: 1.5rem;
}

.footer-social-icons a {
  color: var(--color-text-light);
  font-size: 1.8rem;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  padding: 0.5rem;
  border-radius: 50%;
  background-color: transparent;
  border: 2px solid transparent;
}

.footer-social-icons a:hover {
  color: var(--color-secondary);
  transform: translateY(-5px) scale(1.15);
  background-color: rgba(67, 171, 246, 0.1);
  border-color: var(--color-secondary);
  box-shadow: 0 4px 15px rgba(67, 171, 246, 0.3);
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  font-size: 0.8rem;
  opacity: 0.8;
  margin-top: 1rem;
}

#back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  z-index: 100;
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  background-color: var(--color-secondary);
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.book-card.animate-on-scroll {
  transition-delay: calc(0.05s * var(--card-index));
}

body.dark-mode {
  --color-background: #000000;
  --color-background-gradient: none;
  --color-surface: #1e1e1e;
  --color-primary: #ffffff;
  --color-secondary: #43abf6;
  --color-text: #e0e0e0;
  --color-text-light: #a0a0a0;
  --color-border: #2c2c2c;
  --shadow-color: rgba(255, 255, 255, 0.1);
  animation: none;
  background-color: #000000 !important;
  background-image: none !important;
}

body.dark-mode .book-card:hover {
  box-shadow: 0 25px 50px rgba(67, 171, 246, 0.2), 0 15px 35px rgba(255, 255, 255, 0.05);
}

body.dark-mode .cta-button {
  background: linear-gradient(135deg, var(--color-primary), #f0f0f0);
  color: #000000;
}

body.dark-mode .cta-button:hover {
  background: linear-gradient(135deg, var(--color-secondary), #2563eb);
  color: white;
}

body.dark-mode .inscricao-form button {
  background: linear-gradient(135deg, var(--color-primary), #f0f0f0);
  color: #000000;
}

body.dark-mode .inscricao-form button:hover {
  background: linear-gradient(135deg, var(--color-secondary), #2563eb);
  color: white;
}

.feature-image-wrapper {
  display: grid;
  place-items: center;
  position: relative;
}

.light-mode-image,
.dark-mode-image {
  grid-column: 1 / 1;
  grid-row: 1 / 1;
  width: 100%;
  height: auto;
  position: relative;
  transform: translateY(0);
}

.dark-mode-image {
  transform: translateY(-2px);
}

body:not(.dark-mode) .light-mode-image {
  opacity: 1;
}

body:not(.dark-mode) .dark-mode-image {
  opacity: 0;
}

body.dark-mode .light-mode-image {
  opacity: 0;
}

body.dark-mode .dark-mode-image {
  opacity: 1;
}

body.dark-mode .light-mode-image,
body.dark-mode .dark-mode-image {
  transition: opacity 0.8s ease-in-out;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  header {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 2rem 1.5rem;
  }

  .theme-switcher {
    position: static;
    transform: none;
    justify-content: center;
  }

  .feature,
  .catalog,
  .cta,
  .site-footer {
    padding: 3rem 1.5rem;
  }

  .book-grid {
    gap: 1.5rem;
  }

  .book-card-image-container {
    height: 280px;
  }

  .inscricao-form {
    padding: 2.5rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  p {
    font-size: 0.95rem;
  }

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

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

.inscricao-form h2 {
  text-align: center;
}

.inscricao-form p {
  text-align: center;
}