:root {
  --ai-accent: #7C3AED;
  --ai-accent-light: #A78BFA;
  --ai-accent-dark: #5B21B6;
  --ai-accent-rgb: 124, 58, 237;
  --ai-bg: rgba(124, 58, 237, 0.08);
  --ai-bg-hover: rgba(124, 58, 237, 0.15);
  --ai-bg-active: rgba(124, 58, 237, 0.2);
  --ai-border: rgba(124, 58, 237, 0.3);
  --ai-glow: 0 0 20px rgba(124, 58, 237, 0.15);
  --ai-glow-strong: 0 0 30px rgba(124, 58, 237, 0.3);
  --ai-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --ai-sidebar-width: 320px;
  --ai-sidebar-collapsed: 0px;
  --ai-captions-bg: rgba(0, 0, 0, 0.6);
  --ai-captions-text: #ffffff;
  --ai-captions-font-size: 16px;
  --ai-sheet-radius: 16px;
  --ai-sheet-handle-size: 36px;
  --ai-badge-bg: #7C3AED;
  --ai-badge-text: #ffffff;
  --ai-toast-bg: #7C3AED;
  --ai-toast-text: #ffffff;
}

@media (max-width: 768px) {
  :root {
    --ai-sidebar-width: 100vw;
    --ai-captions-font-size: 14px;
  }
}

[data-theme="light"] {
  --ai-bg: rgba(124, 58, 237, 0.05);
  --ai-bg-hover: rgba(124, 58, 237, 0.1);
  --ai-bg-active: rgba(124, 58, 237, 0.15);
  --ai-border: rgba(124, 58, 237, 0.2);
  --ai-captions-bg: rgba(255, 255, 255, 0.9);
  --ai-captions-text: #1a1a2e;
}

.ai-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--ai-border);
  background: var(--ai-bg);
  color: var(--ai-accent);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--ai-transition);
}

.ai-btn:hover {
  background: var(--ai-bg-hover);
  border-color: var(--ai-accent-light);
}

.ai-btn.active {
  background: var(--ai-accent);
  color: #fff;
  border-color: var(--ai-accent);
}

.ai-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

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

.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--ai-badge-bg);
  color: var(--ai-badge-text);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ai-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--ai-toast-bg);
  color: var(--ai-toast-text);
  font-size: 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  animation: ai-toast-in 0.3s ease;
}

@keyframes ai-toast-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .ai-toast {
    left: 16px;
    right: 16px;
    bottom: 80px;
    text-align: center;
  }
}