globals.css

:root {
  /* HIG Semantic Scales (8px Grid) */
  --space-xs: 4px;
  --space-s: 8px;
  --space-m: 16px;
  --space-l: 24px;
  --space-xl: 32px;
  --radius-s: 8px;
  --radius-m: 12px;
  --radius-l: 20px;
  --radius-xl: 32px;

  /* HIG Vibrancy Typography */
  --vibrant-primary: #ffffff;
  --vibrant-label: rgba(255, 255, 255, 0.65);
  --vibrant-secondary: rgba(255, 255, 255, 0.45);
  --vibrant-tertiary: rgba(255, 255, 255, 0.25);

  /* DNA Color Palette (Neutral High-Contrast) */
  --accent-blue: #0a84ff;
  --orange: #ff9f0a;
  --green: #30d158;
  --red: #ff453a;

  /* Refractive Material - Stained Glass DNA */
  --liquid-blur: blur(20px) saturate(180%) brightness(1.2);
  --glass-panel: rgba(15, 15, 20, 0.35);
  --glass-bg: rgba(25, 25, 30, 0.25);
  --glass-bg-hover: rgba(35, 35, 45, 0.35);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-blue: rgba(10, 132, 255, 0.3);
  --internal-glow: rgba(10, 132, 255, 0.05);
  --glass-blue: rgba(10, 132, 255, 0.05);

  /* Liquid Glass Specular Tokens */
  --liquid-specular: rgba(255, 255, 255, 0.85);
  --liquid-edge: rgba(255, 255, 255, 0.15);
  --liquid-shadow: rgba(0, 0, 0, 0.25);
  --liquid-refraction: linear-gradient(180deg,
      rgba(255, 255, 255, 0.2) 0%,
      rgba(255, 255, 255, 0.05) 50%,
      rgba(255, 255, 255, 0.15) 100%);

  /* Controls */
  --segmented-pill: #ffffff;
  --segmented-bg: rgba(255, 255, 255, 0.1);
  --liquid-morph: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body,
#root {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: transparent;
}

body {
  font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--vibrant-primary);
  letter-spacing: -0.015em;
  user-select: none;
  -webkit-app-region: no-drag;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.app {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background: transparent;
  overflow: hidden;

  /* Master Cut-Glass Boundary - CLEANED FOR PERFECTION */
  box-shadow:
    inset 0 1.5px 2px rgba(255, 255, 255, 0.15); /* PURE LIGHT RIM */

  /* Unified Liquid Surface */
  backdrop-filter: var(--liquid-blur);
  -webkit-backdrop-filter: var(--liquid-blur);
}

/* Master Liquid Glass Panel */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--liquid-blur);
  -webkit-backdrop-filter: var(--liquid-blur);
  border-radius: var(--radius-xl);
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.15); /* ATMOSPHERIC DEPTH */
  transition: var(--liquid-morph);
  position: relative;
  overflow: hidden;
}

/* Luminous Block UI */
.gradient-btn {
  position: relative;
  background: linear-gradient(180deg, var(--green) 0%, #28b84d 100%);
  color: #000;
  border: none;
  padding: 16px 48px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  overflow: hidden;
  transition: var(--liquid-morph);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.3); /* BUTTON GLINT */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-glass);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--vibrant-secondary);
}

/* Selection Island Utility */
.selection-island {
  background: var(--glass-panel);
  backdrop-filter: var(--liquid-blur);
  -webkit-backdrop-filter: var(--liquid-blur);
  border: 0.5px solid var(--border-glass); /* UNIFIED LIGHT SURFACE - ZERO BLACK SHADOWS */
  box-shadow: 
     inset 0 1px 1px rgba(255, 255, 255, 0.15); /* Top Rim Light Only */
}

.hig-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--vibrant-label);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hig-body {
  font-size: 13px;
  color: var(--vibrant-primary);
  line-height: 1.5;
}

.frosted-text {
  opacity: 0.45;
  font-weight: 500;
  letter-spacing: 0.02em;
}