/* ============================================
   CancerBrief Polish
   Interaction states, motion, texture, accessibility
   ============================================ */

.scan-loader {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 999;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(90deg, rgba(255, 93, 54, 0) 0%, var(--color-cyan) 24%, var(--color-amber) 56%, rgba(255, 93, 54, 0) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity var(--duration-fast) var(--ease-default);
}

.scan-loader[data-active] {
  opacity: 1;
  animation: scan-sweep 1.2s var(--ease-default) infinite;
}

@keyframes scan-sweep {
  0%   { transform: scaleX(0); transform-origin: left; }
  48%  { transform: scaleX(1); transform-origin: left; }
  52%  { transform: scaleX(1); transform-origin: right; }
  100% { transform: scaleX(0); transform-origin: right; }
}

#app {
  animation: page-enter var(--duration-slow) var(--ease-default) both;
}

@keyframes page-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

*:focus-visible {
  outline: 2px solid var(--color-amber);
  outline-offset: 2px;
}

@media (pointer: coarse) {
  a, button {
    min-height: 44px;
    min-width: 44px;
  }
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background:
    radial-gradient(120% 80% at 50% -10%, var(--color-body-glow) 0%, transparent 58%),
    linear-gradient(135deg, rgba(66, 214, 199, 0.08) 0%, rgba(66, 214, 199, 0) 36%),
    linear-gradient(180deg, rgba(255, 93, 54, 0.06) 0%, transparent 42%);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0.065;
  background-image:
    linear-gradient(color-mix(in srgb, var(--color-ink) 2%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66, 214, 199, 0.02) 1px, transparent 1px),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.78' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 100% 3px, 96px 96px, 256px 256px;
  background-repeat: repeat;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--grid-margin);
  z-index: 1000;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-panel);
  color: var(--color-bg);
  text-decoration: none;
  border: 1px solid var(--color-cyan);
  box-shadow: 4px 4px 0 var(--color-amber);
}

.skip-link:focus {
  top: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .scan-loader[data-active] {
    animation: none;
    transform: scaleX(1);
    opacity: 0.4;
  }
}