.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--accent-secondary);
}

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

.btn-outline:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
}

.badge-primary {
  background: var(--accent-light);
  color: var(--accent-primary);
}

.badge-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-primary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 28px;
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  z-index: var(--z-toast);
  animation: toastIn 0.3s ease;
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
}

@keyframes toastIn {
  from { transform: translateX(-50%) translateY(20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

.theme-toggle {
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  aspect-ratio: 1;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

[data-theme="dark"] .theme-toggle:hover {
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent-secondary);
}

.theme-toggle svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  position: absolute;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-tertiary);
  text-align: center;
}

.empty-state svg {
  width: 64px;
  height: 64px;
  fill: var(--text-tertiary);
  opacity: 0.4;
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
  max-width: 360px;
}

.size-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-overlay.visible {
  opacity: 1;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 480px;
  margin: 20px;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
  overflow: hidden;
}

.modal-overlay.visible .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px 0;
}

.modal-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.modal-body {
  padding: 16px 24px;
}

.modal-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.modal-detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  font-size: 13px;
}

.modal-detail-label {
  color: var(--text-tertiary);
  flex-shrink: 0;
  font-weight: 500;
}

.modal-detail-value {
  color: var(--text-primary);
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.modal-security {
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.modal-security-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.modal-security-label svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.modal-security-hash {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  word-break: break-all;
  line-height: 1.6;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  transition: background-color var(--transition-fast);
  position: relative;
}

.modal-security-hash:hover {
  background: var(--bg-hover);
}

.modal-security-hash.copied::after {
  content: 'Copied!';
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  padding: 3px 8px;
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-family: var(--font-sans);
  white-space: nowrap;
}

.modal-footer {
  padding: 12px 24px 20px;
}

.modal-footer-row {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.modal-source {
  text-align: center;
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 12px;
}

.modal-source a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.modal-source a:hover {
  color: var(--accent-primary);
}

.modal-footer .btn {
  padding: 8px 20px;
}

.modal-footer .modal-confirm svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.content-modal {
  max-width: 560px;
}

.content-modal .modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.content-modal .modal-header h3 {
  flex: 1;
  min-width: 0;
}

.modal-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-close-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.modal-body-scroll {
  padding: 16px 24px 24px;
  max-height: 65vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.modal-body-scroll::-webkit-scrollbar {
  width: 6px;
}

.modal-body-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.modal-body-scroll::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

.modal-body-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

.content-section {
  margin-bottom: 20px;
}

.content-section:last-child {
  margin-bottom: 0;
}

.content-section h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.content-section p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0 0 8px;
}

.content-section p:last-child {
  margin-bottom: 0;
}

.content-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.content-section li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  margin-bottom: 4px;
}

.content-section li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}

.content-section a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.content-section a:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

.content-meta {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-primary);
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  transition: border-color var(--transition-fast);
}

.contact-row:hover {
  border-color: var(--accent-primary);
}

.contact-row svg {
  width: 20px;
  height: 20px;
  fill: var(--text-tertiary);
  flex-shrink: 0;
}

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

.contact-row-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}

.contact-row-value {
  font-size: 13px;
}

.contact-row-value a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-row-value a:hover {
  color: var(--accent-secondary);
}

.scroll-top-btn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  box-shadow: var(--shadow-md);
  z-index: 50;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-normal), transform var(--transition-normal),
              background-color var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast);
  pointer-events: none;
}

.scroll-top-btn.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.scroll-top-btn:active {
  transform: translateY(1px);
}

.scroll-top-btn:hover {
  background: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}

.scroll-top-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

@media (max-width: 768px) {
  .scroll-top-btn { display: flex; }
}

.click-effects-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  overflow: hidden;
}

.click-effect-sparkle {
  position: absolute;
  width: 8px;
  height: 8px;
  transform: translate(-50%, -50%);
}

.sparkle-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 6px var(--accent-primary), 0 0 12px var(--accent-secondary);
  animation: sparkleFloat 0.8s ease-out forwards;
}

@keyframes sparkleFloat {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--tx), var(--ty)) scale(0);
  }
}

.sidebar-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border-primary);
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer a {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.sidebar-footer a:hover {
  color: var(--accent-primary);
  text-decoration: none;
}

.sidebar-version {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
  opacity: 0.55;
}