:root {
  /* MediChain Sovereign Color Palette (Exact match with Android App Theme) */
  --teal-primary: #6D28D9;       /* Rich Royal Purple */
  --teal-secondary: #8B5CF6;     /* Vibrant Amethyst Purple */
  --navy-dark: #4C1D95;          /* Deep Purple Accent */
  --slate-gray: #6B7280;         /* Neutral Slate Gray */
  --slate-dark: #1F2937;         /* Dark Charcoal / Slate */
  --green-verified: #10B981;     /* Emerald Mint for verified success */
  --coral-alert: #EF4444;        /* Crimson Red for alerts */
  --amber-warning: #F59E0B;      /* Warm Amber for pending states */
  --mint-dark: #D8B4FE;          /* Soft Lavender Orchid */
  --slate-light: #F5F3FF;        /* Light Lilac-White */
  --surface-dark: #7C3AED;       /* Vibrant Royal Purple Card/Header */
  --background-dark: #FAF5FF;    /* Primary App Canvas Background */
  
  /* Font Stacks */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Shadows & Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(109, 40, 217, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(109, 40, 217, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(109, 40, 217, 0.15), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-purple-glow: 0 0 20px rgba(109, 40, 217, 0.25);
  --shadow-emerald-glow: 0 0 18px rgba(16, 185, 129, 0.3);
  --shadow-red-glow: 0 0 18px rgba(239, 68, 68, 0.35);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--background-dark);
  color: var(--slate-dark);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(109, 40, 217, 0.04);
}
::-webkit-scrollbar-thumb {
  background: rgba(109, 40, 217, 0.25);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(109, 40, 217, 0.45);
}

/* Typography Helpers */
.font-mono {
  font-family: var(--font-mono);
}

/* Custom Gradients */
.gradient-purple-hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--teal-primary) 50%, var(--surface-dark) 100%);
}

.gradient-card-border {
  border: 1px solid rgba(109, 40, 217, 0.18);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.gradient-card-border:hover {
  border-color: rgba(109, 40, 217, 0.4);
  box-shadow: var(--shadow-md);
}

/* Pulse Animation for Live Nodes and Wearables */
@keyframes pulse-emerald {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.15);
  }
}

@keyframes ecg-scan {
  0% {
    stroke-dashoffset: 800;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

.animate-pulse-emerald {
  animation: pulse-emerald 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.ecg-line {
  stroke-dasharray: 800;
  animation: ecg-scan 2.8s linear infinite;
}

/* Pill Badges */
.badge-purple {
  background: rgba(109, 40, 217, 0.12);
  color: var(--teal-primary);
  font-weight: 600;
  border: 1px solid rgba(109, 40, 217, 0.25);
}

.badge-emerald {
  background: rgba(16, 185, 129, 0.12);
  color: var(--green-verified);
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-coral {
  background: rgba(239, 68, 68, 0.12);
  color: var(--coral-alert);
  font-weight: 600;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--amber-warning);
  font-weight: 600;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Modal Backdrop Blur */
.modal-backdrop {
  background-color: rgba(31, 41, 55, 0.6);
  backdrop-filter: blur(5px);
}

/* Cryptographic Blockchain Block Node */
.block-node {
  position: relative;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(109, 40, 217, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.block-node:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-purple-glow);
  border-color: var(--teal-primary);
}

.block-node::after {
  content: '';
  position: absolute;
  right: -18px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 2px;
  background: var(--teal-secondary);
}

.block-node:last-child::after {
  display: none;
}

/* Interactive Tabs */
.tab-btn.active {
  background-color: var(--teal-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(109, 40, 217, 0.3);
}

.tab-btn:not(.active):hover {
  background-color: rgba(109, 40, 217, 0.08);
  color: var(--teal-primary);
}

/* Emergency Break Glass Banner */
.emergency-banner {
  background: linear-gradient(90deg, #991B1B 0%, #EF4444 50%, #DC2626 100%);
  box-shadow: var(--shadow-red-glow);
}