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

:root {
  /* Layout */
  --mobile-width: 375px;
  --desktop-width: 1440px;

  /* Colors - Neutral */
  --neutral-900: hsl(227, 75%, 14%);
  --neutral-800: hsl(226, 25%, 17%);
  --neutral-700: hsl(225, 23%, 24%);
  --neutral-600: hsl(226, 11%, 37%);
  --neutral-300: hsl(0, 0%, 78%);
  --neutral-200: hsl(217, 61%, 90%);
  --neutral-100: hsl(0, 0%, 93%);
  --neutral-0: hsla(200, 60%, 99%, 1);

  /* Colors - Red */
  --red-400: hsl(3, 86%, 64%);
  --red-500: hsl(3, 71%, 56%);
  --red-700: hsl(3, 77%, 44%);

  /* Gradients */
  --light-gradient: linear-gradient(180deg, #ebf2fc 0%, #eef8f9 100%);
  --dark-gradient: linear-gradient(180deg, #040918 0%, #091540 100%);

  /* Typography */
  --font-family: "Noto Sans", sans-serif;
  --font-size-paragraph: 16px;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
}

body {
  font-family: var(--font-family);
  background: var(--dark-gradient);
  color: var(--neutral-0);
  min-height: 100vh;
  line-height: 1.5;
  transition: all 0.3s ease;
}

/* Tema Claro */
body.light-theme {
  background: var(--light-gradient);
  color: var(--neutral-900);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header Styles */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
  padding: 1rem;
  background: var(--neutral-800);
  border-radius: 14px;
  border: 1px solid var(--neutral-700);
  transition: all 0.3s ease;
}

/* Header - Tema Claro */
body.light-theme .header {
  background: var(--neutral-0);
  border-color: var(--neutral-200);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Logo SVG - Tema Claro */
body.light-theme .header .logo {
  filter: brightness(0) saturate(100%) invert(13%) sepia(78%) saturate(1015%)
    hue-rotate(214deg) brightness(92%) contrast(96%);
}

.header button {
  background: var(--neutral-700);
  border: none;
  border-radius: 8px;
  padding: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Botão - Tema Claro */
body.light-theme .header button {
  background: var(--neutral-200);
}

body.light-theme .header button:hover {
  background: var(--neutral-300);
}

.header button:hover {
  background: var(--neutral-600);
}

.header button img {
  width: 20px;
  height: 20px;
}

/* Section Header */
section > header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

section > header h2 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--neutral-0);
}

/* Título - Tema Claro */
body.light-theme section > header h2 {
  color: var(--neutral-900);
}

/* Filter Buttons */
.filters {
  display: flex;
  gap: 0.5rem;
  background: var(--neutral-800);
  padding: 4px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

/* Filtros - Tema Claro */
body.light-theme .filters {
  background: var(--neutral-100);
}

.filter-button {
  background: transparent;
  border: none;
  color: var(--neutral-300);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  transition: all 0.3s ease;
}

/* Botões de Filtro - Tema Claro */
body.light-theme .filter-button {
  color: var(--neutral-600);
}

body.light-theme .filter-button:hover {
  background: var(--neutral-200);
  color: var(--neutral-900);
}

body.light-theme .filter-button.active {
  background: var(--neutral-900);
  color: var(--neutral-0);
}

.filter-button:hover {
  background: var(--neutral-700);
  color: var(--neutral-0);
}

.filter-button.active {
  background: var(--neutral-0);
  color: var(--neutral-900);
}

/* Extensions Grid */
.extensions {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  list-style: none;
}

/* Extension Card */
.extension-card {
  background: var(--neutral-800);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all 0.3s ease;
  border: 1px solid var(--neutral-700);
}

/* Cards - Tema Claro */
body.light-theme .extension-card {
  background: var(--neutral-0);
  border-color: var(--neutral-200);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.extension-card:hover {
  transform: translateY(-2px);
  border-color: var(--neutral-600);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.extension-card.inactive {
  opacity: 0.6;
}

.extension-card img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

/* Card Content */
.card-content {
  flex: 1;
}

.card-content h3 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  color: var(--neutral-0);
  margin-bottom: 0.5rem;
}

/* Título do Card - Tema Claro */
body.light-theme .card-content h3 {
  color: var(--neutral-900);
}

.card-content p {
  font-size: var(--font-size-paragraph);
  color: var(--neutral-300);
  line-height: 1.5;
}

/* Descrição do Card - Tema Claro */
body.light-theme .card-content p {
  color: var(--neutral-600);
}

/* Card Footer */
.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: auto;
}

/* Remove Button */
.remove-btn {
  background: transparent;
  border: 1px solid var(--red-500);
  color: var(--red-500);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  transition: all 0.3s ease;
  font-size: 0.875rem;
}

.remove-btn:hover {
  background: var(--red-500);
  color: var(--neutral-0);
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
  flex-shrink: 0;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--neutral-600);
  transition: 0.3s;
  border-radius: 26px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--neutral-300);
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--red-500);
}

input:checked + .slider:before {
  transform: translateX(24px);
  background-color: var(--neutral-0);
}

/* Attribution */
.attribution {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--neutral-700);
  font-size: 0.875rem;
  color: var(--neutral-300);
}

.attribution a {
  color: var(--neutral-0);
  text-decoration: none;
  transition: color 0.3s ease;
}

.attribution a:hover {
  color: var(--red-400);
}

/* Tema Claro - Attribution */
body.light-theme .attribution {
  border-top-color: var(--neutral-300);
  color: var(--neutral-600);
}

body.light-theme .attribution a {
  color: var(--neutral-800);
}

body.light-theme .attribution a:hover {
  color: var(--red-500);
}

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

  .header {
    padding: 1rem;
    margin-bottom: 1.5rem;
  }

  section > header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .card-footer {
    flex-direction: row;
    gap: 0.75rem;
    align-items: stretch;
  }

  .remove-btn {
    align-self: stretch;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header {
    margin-bottom: 1rem;
    padding: 0.75rem;
  }

  .header img {
    height: 28px;
  }

  section > header h2 {
    font-size: 1.25rem;
  }

  .filters {
    width: 100%;
  }

  .filter-button {
    flex: 1;
    text-align: center;
  }
}