/* ============================================================
   ECHO FRAGMENTS — Glitch Overlay System
   Terra Conflictus 2066
   Cathode Green / Phosphor Terminal Aesthetic
   ============================================================ */

/* --- Container (no backdrop -- fragments float over the page) --- */
#echo-frag-root {
  position: fixed;
  z-index: 99998;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}
#echo-frag-root.echo-active {
  pointer-events: auto;
  opacity: 1;
}

/* --- Main Overlay Card --- */
.echo-card {
  position: relative;
  width: 520px;
  max-width: calc(100vw - 40px);
  background: rgba(2, 8, 2, 0.96);
  border: 1px solid rgba(57, 255, 20, 0.25);
  border-radius: 0;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow:
    0 0 8px rgba(57, 255, 20, 0.06),
    inset 0 0 40px rgba(57, 255, 20, 0.02);
}
.echo-card:hover {
  border-color: rgba(57, 255, 20, 0.45);
  box-shadow:
    0 0 14px rgba(57, 255, 20, 0.1),
    inset 0 0 40px rgba(57, 255, 20, 0.03);
}
.echo-card.echo-expanded {
  cursor: default;
}

/* --- CRT Scanline Overlay --- */
.echo-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(57, 255, 20, 0.03) 1px,
    rgba(57, 255, 20, 0.03) 2px
  );
  pointer-events: none;
  z-index: 2;
}

/* --- Phosphor glow bleed on the card edges --- */
.echo-card::after {
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid rgba(57, 255, 20, 0.08);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.04);
  pointer-events: none;
  z-index: 0;
  animation: echo-border-flicker 3s ease-in-out infinite;
}

/* --- Progress Bar (top edge) --- */
.echo-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(57, 255, 20, 0.6);
  box-shadow: 0 0 6px rgba(57, 255, 20, 0.3);
  transform: scaleX(0);
  transform-origin: left;
  z-index: 3;
}
.echo-progress.echo-running {
  transition: transform 10s linear;
  transform: scaleX(1);
}
.echo-progress.echo-paused {
  transition: opacity 0.3s ease;
  opacity: 0;
}

/* --- Signal Header --- */
.echo-signal {
  padding: 10px 16px 8px;
  border-bottom: 1px solid rgba(57, 255, 20, 0.08);
  font-family: 'IBM Plex Mono', 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.6px;
  line-height: 1.4;
  color: rgba(57, 255, 20, 0.45);
  text-shadow: 0 0 4px rgba(57, 255, 20, 0.15);
  position: relative;
  z-index: 1;
}

/* --- Hook Text --- */
.echo-hook {
  padding: 14px 20px 4px;
  font-family: 'Archivo Narrow', 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: rgba(57, 255, 20, 0.88);
  text-shadow: 0 0 6px rgba(57, 255, 20, 0.12);
  letter-spacing: 0.15px;
  position: relative;
  z-index: 1;
}

/* --- Click Hint --- */
.echo-hint {
  padding: 0 20px 14px;
  font-family: 'IBM Plex Mono', 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 1px;
  color: rgba(57, 255, 20, 0.25);
  opacity: 0;
  transition: opacity 0.5s ease;
  position: relative;
  z-index: 1;
}
.echo-hint.echo-visible {
  opacity: 1;
}

/* --- Expansion --- */
.echo-expand {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.6s ease, opacity 0.5s ease;
  opacity: 0;
  position: relative;
  z-index: 1;
}
.echo-expand.echo-open {
  max-height: 500px;
  opacity: 1;
}
.echo-expand-inner {
  border-top: 1px solid rgba(57, 255, 20, 0.06);
  margin: 0 20px;
  padding: 14px 0 20px;
  font-family: 'Archivo Narrow', 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(57, 255, 20, 0.72);
  text-shadow: 0 0 3px rgba(57, 255, 20, 0.06);
  letter-spacing: 0.15px;
}

/* --- Close Button --- */
.echo-close {
  position: absolute;
  top: 8px;
  right: 10px;
  font-family: 'IBM Plex Mono', 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 1px;
  color: rgba(57, 255, 20, 0.2);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  z-index: 5;
  display: none;
  transition: color 0.2s ease;
}
.echo-close:hover {
  color: rgba(57, 255, 20, 0.6);
}
.echo-expanded .echo-close {
  display: block;
}

/* --- Glitch Flicker Keyframes --- */
@keyframes echo-flicker-in {
  0%   { opacity: 0; transform: translateX(-4px) skewX(-1.5deg); filter: brightness(3); }
  5%   { opacity: 1; transform: translateX(3px) skewX(0.8deg); filter: brightness(1); }
  10%  { opacity: 0; transform: translateX(-6px) skewX(-0.5deg); }
  15%  { opacity: 0.9; transform: translateX(1px); filter: brightness(1.5); }
  20%  { opacity: 0.1; transform: translateX(-2px) skewX(1deg); }
  30%  { opacity: 1; transform: translateX(4px) skewX(-0.3deg); filter: brightness(1); }
  35%  { opacity: 0; transform: translateX(0); }
  40%  { opacity: 0.7; transform: translateX(-3px) skewX(0.5deg); }
  50%  { opacity: 1; transform: translateX(2px); filter: brightness(1.2); }
  55%  { opacity: 0.4; transform: translateX(-1px); filter: brightness(1); }
  65%  { opacity: 1; transform: translateX(0); }
  70%  { opacity: 0.6; transform: translateX(1px) skewX(-0.2deg); }
  80%  { opacity: 1; transform: translateX(0); }
  100% { opacity: 1; transform: translateX(0); filter: brightness(1); }
}

/* Periodic glitch burst -- more violent than before */
@keyframes echo-glitch-burst {
  0%, 92%   { transform: translate(0, 0) skewX(0); filter: none; }
  93%  { transform: translate(-3px, 1px) skewX(-1deg); filter: brightness(1.4); }
  94%  { transform: translate(4px, -1px) skewX(0.5deg); }
  95%  { transform: translate(-2px, 0) skewX(-0.3deg); filter: brightness(0.8); }
  96%  { transform: translate(0, 2px) skewX(0.8deg); filter: brightness(1.6); }
  97%  { transform: translate(1px, -1px) skewX(0); filter: none; }
  98%, 100% { transform: translate(0, 0) skewX(0); filter: none; }
}

/* Border flicker for the ::after pseudo */
@keyframes echo-border-flicker {
  0%, 89%, 100% { opacity: 1; }
  90%  { opacity: 0.3; }
  91%  { opacity: 0.9; }
  92%  { opacity: 0.1; }
  93%  { opacity: 0.7; }
  94%  { opacity: 1; }
}

@keyframes echo-scanline-sweep {
  0%   { top: -2px; }
  100% { top: 100%; }
}

/* Horizontal split-glitch: card briefly tears apart */
@keyframes echo-tear {
  0%, 95%, 100% { clip-path: inset(0); }
  96%  { clip-path: inset(0 0 52% 0); transform: translateX(3px); }
  97%  { clip-path: inset(48% 0 0 0); transform: translateX(-3px); }
  98%  { clip-path: inset(0); transform: translateX(0); }
}

.echo-card.echo-entering {
  animation: echo-flicker-in 0.7s ease-out forwards;
}

/* Ongoing glitch bursts while drifting (pre-click) */
.echo-card.echo-drifting {
  animation: echo-glitch-burst 4s ease-in-out infinite, echo-tear 6s linear infinite;
}

/* Settled state after click/expand -- no more drift glitches */
.echo-card.echo-settled {
  animation: none;
}

/* Horizontal glitch bar that sweeps down the card */
.echo-scanline {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(57, 255, 20, 0.15);
  box-shadow: 0 0 4px rgba(57, 255, 20, 0.08);
  z-index: 4;
  pointer-events: none;
  opacity: 0;
}
.echo-scanline.echo-sweep {
  opacity: 1;
  animation: echo-scanline-sweep 2s linear infinite;
}

/* --- Full-page flash effect --- */
.echo-page-flash {
  position: fixed;
  inset: 0;
  z-index: 99997;
  pointer-events: none;
  background: rgba(57, 255, 20, 0.03);
  opacity: 0;
}
.echo-page-flash.echo-flash-active {
  animation: echo-page-flash-anim 0.3s ease-out forwards;
}
@keyframes echo-page-flash-anim {
  0%   { opacity: 1; }
  15%  { opacity: 0; }
  25%  { opacity: 0.6; }
  40%  { opacity: 0; }
  50%  { opacity: 0.3; }
  100% { opacity: 0; }
}

/* --- Mobile --- */
@media (max-width: 600px) {
  .echo-card {
    max-width: calc(100% - 24px);
  }
  .echo-hook {
    font-size: 14px;
    padding: 12px 16px 4px;
  }
  .echo-expand-inner {
    font-size: 13px;
    margin: 0 16px;
  }
}