/* ============================================================
   404 — "Signal lost" error page
   Reuses shared.css tokens (--kc-cyan-500, --kc-gradient-ribbon)
   and the auroraShift keyframe already defined there.
   ============================================================ */

.err404 {
  position: relative;
  min-height: 86vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 140px 24px 100px;
  text-align: center;
  background: #121212;
}

.err404-inner {
  position: relative;
  z-index: 2;
  max-width: 560px;
}

.err404-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(96px, 18vw, 200px);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  background: var(--kc-gradient-ribbon);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  position: relative;
  display: inline-block;
}

/* Occasional glitch blip — brief, not a constant strobe */
.err404-title { animation: err404Glitch 6s infinite; }
.err404-title::before,
.err404-title::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  background: none;
  -webkit-background-clip: initial;
  background-clip: initial;
  opacity: 0;
}
.err404-title::before {
  color: var(--kc-cyan-500);
  animation: err404GlitchLayer 6s infinite;
}
.err404-title::after {
  color: #DB1EFA;
  animation: err404GlitchLayer 6s infinite reverse;
}

.err404-message {
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.6;
  opacity: 0.75;
  margin: 0 0 40px;
}

.err404-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  border-radius: 999px;
  background: var(--kc-gradient-ribbon);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.01em;
  box-shadow: 0 14px 40px -12px rgba(159,68,251,0.65);
  transition: transform .2s, box-shadow .2s;
}
.err404-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 50px -10px rgba(219,30,250,0.85);
}

@keyframes err404Glitch {
  0%, 92%, 100% { transform: translate(0, 0); }
  93% { transform: translate(-2px, 1px); }
  95% { transform: translate(2px, -1px); }
  97% { transform: translate(-1px, 0); }
}
@keyframes err404GlitchLayer {
  0%, 92%, 100% { opacity: 0; transform: translate(0, 0); }
  93% { opacity: 0.7; transform: translate(3px, -1px); }
  95% { opacity: 0.7; transform: translate(-3px, 1px); }
  97% { opacity: 0; transform: translate(0, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .err404-title,
  .err404-title::before,
  .err404-title::after {
    animation: none !important;
  }
}

@media (max-width: 640px) {
  .err404 { padding: 120px 20px 80px; min-height: 80vh; }
}