/* FMG shared visual-language utilities (cross-module) */
:root {
  --fmg-rail-size: 2.5px;
  --fmg-rail-accent: var(--fmg-color-accent, #7334f0);
  --fmg-rail-core-hi: rgba(208, 187, 255, 0.96);
  --fmg-rail-core: rgba(115, 52, 240, 0.92);
  --fmg-rail-core-low: rgba(82, 35, 170, 0.88);
  --fmg-rail-glow: rgba(115, 52, 240, 0.09);
}

.fmg-u-hidden {
  display: none !important;
}

/* Accent rail for card/surface modules */
.fmg-accent-rail {
  --fmg-rail-accent: var(--fmg-topic-accent, #7334f0);
  --fmg-rail-core-hi: color-mix(in srgb, var(--fmg-rail-accent), white 56%);
  --fmg-rail-core: var(--fmg-rail-accent);
  --fmg-rail-core-low: color-mix(in srgb, var(--fmg-rail-accent), #000000 28%);
  --fmg-rail-glow: color-mix(in srgb, var(--fmg-rail-accent), transparent 90%);
  position: relative;
  border-left: 0 !important;
}

.fmg-accent-rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: calc(var(--fmg-rail-size) + 1px);
  background:
    linear-gradient(
      180deg,
      var(--fmg-rail-core-hi) 0%,
      var(--fmg-rail-core) 46%,
      var(--fmg-rail-core-low) 100%
    ) left 0 top 0 / var(--fmg-rail-size) 100% no-repeat,
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.72) 0%,
      rgba(255, 255, 255, 0.12) 100%
    ) left var(--fmg-rail-size) top 0 / 1px 100% no-repeat;
  pointer-events: none;
  z-index: 1;
}

.fmg-accent-rail::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 12px;
  background: radial-gradient(
    12px 116% at 3px 50%,
    var(--fmg-rail-glow) 0%,
    rgba(115, 52, 240, 0) 74%
  );
  pointer-events: none;
  z-index: 1;
}

/* Accent rail for heading blocks */
.fmg-accent-rail-heading {
  --fmg-rail-accent: var(--fmg-topic-accent, #7334f0);
  --fmg-rail-core-hi: color-mix(in srgb, var(--fmg-rail-accent), white 56%);
  --fmg-rail-core: var(--fmg-rail-accent);
  --fmg-rail-core-low: color-mix(in srgb, var(--fmg-rail-accent), #000000 28%);
  position: relative;
  border-left: 0 !important;
}

.fmg-accent-rail-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: calc(var(--fmg-rail-size) + 1px);
  background:
    linear-gradient(
      180deg,
      var(--fmg-rail-core-hi) 0%,
      var(--fmg-rail-core) 46%,
      var(--fmg-rail-core-low) 100%
    ) left 0 top 0 / var(--fmg-rail-size) 100% no-repeat,
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.68) 0%,
      rgba(255, 255, 255, 0.18) 100%
    ) left var(--fmg-rail-size) top 0 / 1px 100% no-repeat;
  pointer-events: none;
}

.fmg-aeo-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.2);
  font-size: 1.5rem;
}

.fmg-hub-thumb-placeholder {
  width: 100%;
  height: 100%;
  background: var(--fmg-color-surface-soft, #f0f4f8);
}

.fmg-aeo-empty {
  padding: 1rem;
  color: rgba(255, 255, 255, 0.5);
}