:root {
  --color-primary: #0F172A;
  --color-accent-start: #0052FF;
  --color-accent-end: #4D7CFF;
  --color-surface: #FFFFFF;
  --color-background: #FAFAFA;
  --color-muted: #F1F5F9;
  --color-border: #E2E8F0;
  --color-text: #0F172A;
  --color-text-secondary: #64748B;
  --color-success: #16A34A;
  --color-warning: #F59E0B;
  --color-error: #DC2626;

  --font-heading: 'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);

  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
}

.zoai-gradient-btn {
  background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  color: white;
  border: none;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.zoai-gradient-btn:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.zoai-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  padding: 32px;
  transition: box-shadow var(--transition-normal);
}

.zoai-card:hover {
  box-shadow: var(--shadow-md);
}

.zoai-glass {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
}