* {
  box-sizing: border-box;
}

:root {
  /* Brand Colors */
  --primary-color: #527FFF;
  --primary-dark: #3D5FCC;
  --accent-color: #FF9900;
  --dark-bg: #232F3E;

  /* Light Mode Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-color: #E5E7EB;
  --card-bg: #FFFFFF;
  --card-border: #E5E7EB;
  --header-bg: var(--dark-bg);
  --header-text: #FFFFFF;
}

html.dark {
  --bg-primary: #1A1A1A;
  --bg-secondary: #2D2D2D;
  --text-primary: #E5E5E5;
  --text-secondary: #A0A0A0;
  --border-color: #404040;
  --card-bg: #252525;
  --card-border: #404040;
  --header-bg: #0F1419;
  --header-text: #FFFFFF;
}

@media (prefers-color-scheme: dark) {
  :root:not(.light-mode) {
    --bg-primary: #1A1A1A;
    --bg-secondary: #2D2D2D;
    --text-primary: #E5E5E5;
    --text-secondary: #A0A0A0;
    --border-color: #404040;
    --card-bg: #252525;
    --card-border: #404040;
    --header-bg: #0F1419;
    --header-text: #FFFFFF;
  }
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  color: var(--accent-color);
}

.header-title-link {
  color: var(--accent-color);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.header-title-link:hover {
  opacity: 0.8;
}

.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.dark-mode-toggle {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--header-text);
  font-size: 18px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark-mode-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.dark-mode-toggle:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.github-button {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  color: var(--header-text);
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.github-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.github-button:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.github-button svg {
  width: 20px;
  height: 20px;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* README Section */
.readme-section {
  margin: 16px 0 24px;
}

.readme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  white-space: nowrap;
  margin-bottom: 12px;
}

.readme-toggle:hover {
  border-color: var(--accent-color);
  background-color: rgba(255, 153, 0, 0.1);
}

.readme-toggle:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.readme-toggle span:last-child {
  font-size: 10px;
  transition: transform 0.2s ease;
}

.readme-content {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 16px;
  max-height: 500px;
  overflow-y: auto;
  transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
}

.readme-collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0 16px;
  margin: 0;
  border: none;
}

.readme-body {
  color: var(--text-primary);
}

.readme-body h1 {
  margin-top: 0;
  color: var(--text-primary);
}

.readme-body h2,
.readme-body h3,
.readme-body h4 {
  color: var(--text-primary);
}

.readme-body a {
  color: var(--primary-color);
  text-decoration: none;
}

.readme-body a:hover {
  text-decoration: underline;
}

.readme-body code {
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.readme-body pre {
  background: var(--bg-secondary);
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
}

.readme-body pre code {
  background: none;
  padding: 0;
}

/* Search */
.search-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
}

.search-input {
  flex: 1;
  padding: 12px 16px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--card-bg);
  color: var(--text-primary);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.asset-count {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(255, 153, 0, 0.1);
}

/* Filters Section */
.filters-section {
  margin: 16px 0 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.filters-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.type-filter,
.size-filter {
  display: flex;
  align-items: center;
  gap: 12px;
}

.filter-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

.type-select {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 150px;
}

.type-select:hover {
  border-color: var(--accent-color);
}

.type-select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(255, 153, 0, 0.1);
}

/* Tags Section */
.tags-section {
  margin: 0;
}

.tags-header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tags-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.active-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  flex: 1;
}

.chip-active {
  font-size: 13px;
}

.tags-toggle:hover {
  border-color: var(--accent-color);
  background-color: rgba(255, 153, 0, 0.1);
}

.tags-toggle:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.tags-toggle span:last-child {
  font-size: 10px;
  transition: transform 0.2s ease;
}

/* Tags */
.tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  max-height: 200px;
  overflow-y: auto;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  padding: 8px;
  border-radius: 6px;
  background: var(--bg-secondary);
}

.tags-collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0 8px;
  margin: 0;
}

.chip {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--card-bg);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s ease;
}

.chip:hover {
  border-color: var(--accent-color);
  background-color: rgba(255, 153, 0, 0.1);
}

.chip:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.chip_on {
  background-color: var(--accent-color);
  color: #FFFFFF;
  border-color: var(--accent-color);
}

.chip_on:hover {
  background-color: #E68900;
  border-color: #E68900;
}

/* Grid */
.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  overflow: visible;
  position: relative;
  z-index: 1;
}

/* Card */
.card {
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 12px;
  background-color: var(--card-bg);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
  overflow: visible;
}

.card:hover {
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.dark .card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Asset Container */
.asset-container {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
  position: relative;
  z-index: 1;
  background: var(--bg-secondary);
}

.asset-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.card-actions-grid {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  width: 120px;
  height: 120px;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 10;
}

.card:hover .card-actions-grid {
  opacity: 1;
}

.card-actions-grid .action-btn {
  width: 100%;
  height: 100%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  color: #FFFFFF;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.card-actions-grid .action-btn:hover {
  background: #FF9900;
  border-color: #FF9900;
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(255, 153, 0, 0.5);
}

.card-actions-grid .action-btn:active {
  transform: scale(0.95);
}

.card-actions-grid .action-btn svg {
  width: 14px;
  height: 14px;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}


/* Asset Tooltip - positioned relative to card center */
.asset-tooltip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 16px;
  width: 280px;
  max-width: min(280px, calc(100vw - 32px));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10001;
  visibility: hidden;
  white-space: normal;
  word-wrap: break-word;
}

.dark .asset-tooltip {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.card:hover .asset-tooltip {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(-4px);
}

.tooltip-title {
  font-weight: 600;
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.tooltip-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  word-wrap: break-word;
  min-height: 1em;
  display: block;
}

.asset-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid var(--card-bg);
}

.asset-tooltip::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 9px solid transparent;
  border-right: 9px solid transparent;
  border-top: 9px solid var(--card-border);
  margin-top: 1px;
}

/* Card Content */
.card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  text-align: center;
  padding-top: 8px;
  min-height: 0;
}

.name {
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
  font-size: 12px;
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.type-badge {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 500;
  margin-top: 4px;
}

/* Note */
.note {
  margin-top: 32px;
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-color);
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease;
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #E68900;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  transform: rotate(180deg);
}

.dark .back-to-top {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dark .back-to-top:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 16px;
  }

  .header {
    padding: 12px 16px;
  }

  .header h1 {
    font-size: 20px;
  }

  .filters-section {
    flex-direction: column;
  }

  .type-filter {
    flex-direction: column;
    align-items: flex-start;
  }

  .type-select {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}