@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --pc-bg: #F8FAFC;
  --pc-surface: rgba(255, 255, 255, 0.95);
  --pc-surface-hover: rgba(255, 255, 255, 1);
  --pc-border: rgba(15, 23, 42, 0.06);
  --pc-border-hover: rgba(15, 23, 42, 0.12);
  
  --pc-primary: #4F46E5;
  --pc-primary-hover: #4338CA;
  --pc-primary-light: #EEF2FF;
  
  --pc-accent: #0D9488;
  
  --pc-text-main: #0F172A;
  --pc-text-muted: #475569;
  --pc-text-light: #94A3B8;
  
  --pc-shadow-sm: 0 2px 8px -2px rgba(15, 23, 42, 0.05);
  --pc-shadow-md: 0 12px 32px -8px rgba(15, 23, 42, 0.08);
  --pc-shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
  background-color: var(--pc-bg);
  color: var(--pc-text-main);
  -webkit-font-smoothing: antialiased;
  background-image: 
    radial-gradient(at 0% 0%, hsla(253,16%,7%,0.02) 0, transparent 50%), 
    radial-gradient(at 50% 0%, hsla(225,39%,30%,0.02) 0, transparent 50%), 
    radial-gradient(at 100% 0%, hsla(339,49%,30%,0.02) 0, transparent 50%);
  background-attachment: fixed;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6, .font-display {
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Premium Card / Surface */
.pc-glass {
  background: var(--pc-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--pc-border);
  box-shadow: var(--pc-shadow-md);
  border-radius: 24px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.pc-glass-hover:hover {
  background: var(--pc-surface-hover);
  border-color: var(--pc-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--pc-shadow-lg);
}

/* Primary Button */
.pc-btn-primary {
  background: var(--pc-primary);
  color: #FFFFFF;
  border: none;
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.pc-btn-primary:hover:not(:disabled) {
  background: var(--pc-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}
.pc-btn-primary:disabled {
  background: #CBD5E1;
  box-shadow: none;
  color: #F8FAFC;
  cursor: not-allowed;
}

/* Secondary Button */
.pc-btn-secondary {
  background: #FFFFFF;
  color: var(--pc-text-main);
  border: 1px solid var(--pc-border-hover);
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.2s ease;
  box-shadow: var(--pc-shadow-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.pc-btn-secondary:hover:not(:disabled) {
  background: #F8FAFC;
  border-color: #94A3B8;
  color: var(--pc-primary);
}
.pc-btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Gradient Text */
.pc-text-gradient {
  background: linear-gradient(135deg, #0F172A 0%, #4F46E5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Dropzone */
.pc-dropzone {
  border: 2px dashed #CBD5E1;
  background: #F1F5F9;
  transition: all 0.3s ease;
}
.pc-dropzone:hover, .pc-dropzone.dragover {
  border-color: var(--pc-primary);
  background: var(--pc-primary-light);
}

/* Canvas Background for Light Mode */
.pc-canvas-bg {
  background-color: #F1F5F9;
  background-image: 
    linear-gradient(45deg, #E2E8F0 25%, transparent 25%, transparent 75%, #E2E8F0 75%, #E2E8F0), 
    linear-gradient(45deg, #E2E8F0 25%, transparent 25%, transparent 75%, #E2E8F0 75%, #E2E8F0);
  background-size: 20px 20px;
  background-position: 0 0, 10px 10px;
}

/* Animations */
@keyframes pc-reveal {
  0% { opacity: 0; transform: translateY(15px); }
  100% { opacity: 1; transform: translateY(0); }
}

.animate-reveal {
  animation: pc-reveal 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  opacity: 0;
}

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94A3B8; }