:root {
  --bg-gradient: linear-gradient(135deg, #0f0c20 0%, #15102a 100%);
  --panel-bg: rgba(25, 20, 45, 0.45);
  --panel-border: rgba(255, 255, 255, 0.08);
  --card-bg: rgba(255, 255, 255, 0.03);
  --card-bg-hover: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.06);
  --card-border-hover: rgba(139, 92, 246, 0.4);
  --text-primary: #f3f4f6;
  --text-muted: #9ca3af;
  --accent: #8b5cf6;
  --accent-glow: rgba(139, 92, 246, 0.25);
  --success: #10b981;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Newly extracted for dark mode */
  --logo-gradient: linear-gradient(to right, #a78bfa, #8b5cf6);
  --input-bg: rgba(255, 255, 255, 0.05);
  --input-bg-focus: rgba(255, 255, 255, 0.08);
  --btn-secondary-bg: rgba(255, 255, 255, 0.05);
  --btn-secondary-hover-bg: rgba(255, 255, 255, 0.1);
  --summary-hover-bg: rgba(255, 255, 255, 0.02);
  --icon-container-bg: rgba(255, 255, 255, 0.05);
  --folder-badge-bg: rgba(139, 92, 246, 0.15);
  --folder-badge-color: #c084fc;
  --theme-btn-bg: rgba(255, 255, 255, 0.05);
  --theme-btn-hover-bg: rgba(255, 255, 255, 0.1);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.2);
}

:root[data-theme="light"] {
  /* Premium Light Mode */
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #e8ecf3 100%);
  --panel-bg: rgba(255, 255, 255, 0.65);
  --panel-border: rgba(139, 92, 246, 0.08);
  --card-bg: rgba(255, 255, 255, 0.45);
  --card-bg-hover: rgba(255, 255, 255, 0.85);
  --card-border: rgba(139, 92, 246, 0.05);
  --card-border-hover: rgba(139, 92, 246, 0.4);
  --text-primary: #1e1b4b; /* dark indigo-blue */
  --text-muted: #4b5563;
  --accent: #6d28d9; /* slightly darker violet for optimal contrast */
  --accent-glow: rgba(109, 40, 217, 0.15);
  --success: #059669;

  --logo-gradient: linear-gradient(to right, #6d28d9, #4c1d95);
  --input-bg: rgba(255, 255, 255, 0.7);
  --input-bg-focus: rgba(255, 255, 255, 0.95);
  --btn-secondary-bg: rgba(0, 0, 0, 0.04);
  --btn-secondary-hover-bg: rgba(0, 0, 0, 0.08);
  --summary-hover-bg: rgba(0, 0, 0, 0.02);
  --icon-container-bg: rgba(0, 0, 0, 0.03);
  --folder-badge-bg: rgba(109, 40, 217, 0.08);
  --folder-badge-color: #6d28d9;
  --theme-btn-bg: rgba(0, 0, 0, 0.04);
  --theme-btn-hover-bg: rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 4px 16px rgba(109, 40, 217, 0.08);
}

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

body {
  font-family:
    "Plus Jakarta Sans",
    system-ui,
    -apple-system,
    sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  transition:
    background-color 0.3s ease,
    background 0.3s ease,
    color 0.3s ease;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.logo-area h1 {
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--logo-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.025em;
  margin-bottom: 4px;
}

.stats-container {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.stats-badge {
  background: var(--card-bg);
  border: 1px solid var(--panel-border);
  padding: 4px 10px;
  border-radius: 9999px;
  font-weight: 500;
}

.search-wrapper {
  position: relative;
  width: 360px;
  max-width: 100%;
}

input[type="search"] {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--input-bg);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  backdrop-filter: blur(10px);
}

input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--input-bg-focus);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.drop-zone {
  background: var(--panel-bg);
  border: 2px dashed var(--panel-border);
  border-radius: 16px;
  padding: 40px 24px;
  text-align: center;
  backdrop-filter: blur(16px);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.05);
  box-shadow: inset 0 0 12px var(--accent-glow);
}

.drop-zone svg {
  color: var(--accent);
  width: 48px;
  height: 48px;
}

.btn-container {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  font-family: inherit;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #7c3aed;
  box-shadow: 0 0 15px var(--accent-glow);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  border-color: var(--panel-border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--btn-secondary-hover-bg);
  border-color: var(--text-muted);
}

input[type="file"] {
  display: none;
}

.folder-section {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  margin-bottom: 20px;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

details summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  user-select: none;
  transition: var(--transition-smooth);
  border-bottom: 1px solid transparent;
}

details[open] summary {
  border-color: var(--panel-border);
}

details summary:hover {
  background: var(--summary-hover-bg);
}

.summary-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.summary-title::before {
  content: "▶";
  font-size: 0.8rem;
  color: var(--accent);
  transition: var(--transition-smooth);
  display: inline-block;
}

details[open] .summary-title::before {
  transform: rotate(90deg);
}

.folder-badge {
  font-size: 0.8rem;
  background: var(--folder-badge-bg);
  color: var(--folder-badge-color);
  padding: 2px 8px;
  border-radius: 9999px;
  font-weight: 500;
}

.folder-content {
  padding: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.card:hover {
  background: var(--card-bg-hover);
  border-color: var(--card-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--icon-container-bg);
  overflow: hidden;
  flex-shrink: 0;
}

.icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.fallback-icon {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  background: linear-gradient(135deg, #6d28d9 0%, #4c1d95 100%);
  color: #fff;
  text-transform: uppercase;
}

.info {
  min-width: 0;
  flex: 1;
}

.title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.url {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hidden {
  display: none !important;
}

/* Animação suave para os cards */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.folder-section {
  animation: fadeIn 0.4s ease forwards;
}

/* Header Actions & Theme Toggle Button */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 100%;
}

.theme-toggle-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--theme-btn-bg);
  color: var(--text-primary);
  cursor: pointer;
  transition:
    background-color 0.3s,
    border-color 0.3s,
    box-shadow 0.3s,
    transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  padding: 0;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.theme-toggle-btn:hover {
  background: var(--theme-btn-hover-bg);
  border-color: var(--accent);
  box-shadow:
    0 6px 20px var(--accent-glow),
    0 0 0 2px rgba(139, 92, 246, 0.1);
  transform: translateY(-2px);
}

.theme-toggle-btn:active {
  transform: translateY(1px) scale(0.95);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.theme-toggle-btn svg {
  position: absolute;
  transition:
    transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
    opacity 0.4s ease;
  pointer-events: none;
}

/* Estado Padrão (Tema Escuro) */
.sun-icon {
  opacity: 0;
  transform: scale(0.3) rotate(90deg);
}

.moon-icon {
  opacity: 1;
  transform: scale(1) rotate(0);
}

/* Efeito Hover no ícone da lua (Tema Escuro) */
.theme-toggle-btn:hover .moon-icon {
  transform: scale(1.1) rotate(15deg);
}

/* Estado Alternativo (Tema Claro) */
:root[data-theme="light"] .sun-icon {
  opacity: 1;
  transform: scale(1) rotate(0);
}

:root[data-theme="light"] .moon-icon {
  opacity: 0;
  transform: scale(0.3) rotate(-90deg);
}

/* Efeito Hover no ícone do sol (Tema Claro) */
:root[data-theme="light"] .theme-toggle-btn:hover .sun-icon {
  transform: scale(1.1) rotate(45deg);
}

/* ==========================================
   RESPONSIVIDADE & ADAPTAÇÕES DE TELA
   ========================================== */

@media (max-width: 768px) {
  main {
    padding: 24px 16px;
  }

  header {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .logo-area {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .logo-area h1 {
    font-size: 1.8rem;
  }

  .stats-container {
    justify-content: center;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .search-wrapper {
    width: auto;
    flex: 1;
  }

  .drop-zone {
    padding: 32px 16px;
  }

  details summary {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .folder-content {
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .btn-container {
    flex-direction: column;
    width: 100%;
    gap: 8px;
  }

  .btn {
    width: 100%;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .folder-content {
    padding: 12px;
  }
}