/* =====================================================================
   MALHAR 2026 — border-glow.css
   Vanilla port of the ReactBits <BorderGlow /> component (JS + CSS variant).
   A pointer-driven mesh-gradient border + outer glow that reveals toward the
   cursor as it nears a card's edge. Themed to the Malhar palette:
     mesh colors  = gold-hi / pink / iridescent-blue
     glow color   = warm gold  (hsl 42 72 62)
   The pointer maths live in border-glow.js, which sets --edge-proximity and
   --cursor-angle on each [.bglow] card and injects the <span.edge-light>.
   ===================================================================== */

.bglow {
  --edge-proximity: 0;
  --cursor-angle: 45deg;
  --edge-sensitivity: 30;
  --color-sensitivity: calc(var(--edge-sensitivity) + 20);
  --border-radius: 4px;
  --glow-padding: 34px;
  --cone-spread: 25;
  --fill-opacity: 0.5;
  --card-bg: #0e0a12;

  /* Malhar mesh-gradient border (gold-hi / pink / iridescent-blue) */
  --gradient-one:   radial-gradient(at 80% 55%, #f7e3ab 0px, transparent 50%);
  --gradient-two:   radial-gradient(at 69% 34%, #f405f9 0px, transparent 50%);
  --gradient-three: radial-gradient(at 8% 6%,   #7fd4ff 0px, transparent 50%);
  --gradient-four:  radial-gradient(at 41% 38%, #f7e3ab 0px, transparent 50%);
  --gradient-five:  radial-gradient(at 86% 85%, #f405f9 0px, transparent 50%);
  --gradient-six:   radial-gradient(at 82% 18%, #7fd4ff 0px, transparent 50%);
  --gradient-seven: radial-gradient(at 51% 4%,  #f405f9 0px, transparent 50%);
  --gradient-base:  linear-gradient(#f7e3ab 0 100%);

  /* warm-gold glow ramp */
  --glow-color:    hsl(42deg 72% 62% / 100%);
  --glow-color-60: hsl(42deg 72% 62% / 60%);
  --glow-color-50: hsl(42deg 72% 62% / 50%);
  --glow-color-40: hsl(42deg 72% 62% / 40%);
  --glow-color-30: hsl(42deg 72% 62% / 30%);
  --glow-color-20: hsl(42deg 72% 62% / 20%);
  --glow-color-10: hsl(42deg 72% 62% / 10%);

  position: relative;
  isolation: isolate;
  transform: translate3d(0, 0, 0.01px);
}

.bglow::before,
.bglow::after,
.bglow > .edge-light {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  transition: opacity 0.25s ease-out;
  z-index: -1;
  pointer-events: none;
}

.bglow:not(:hover)::before,
.bglow:not(:hover)::after,
.bglow:not(:hover) > .edge-light {
  opacity: 0;
  transition: opacity 0.6s ease-in-out;
}

/* colored mesh-gradient border, masked into a cone pointing at the cursor */
.bglow::before {
  border: 1px solid transparent;
  background:
    linear-gradient(var(--card-bg) 0 100%) padding-box,
    var(--gradient-one) border-box,
    var(--gradient-two) border-box,
    var(--gradient-three) border-box,
    var(--gradient-four) border-box,
    var(--gradient-five) border-box,
    var(--gradient-six) border-box,
    var(--gradient-seven) border-box,
    var(--gradient-base) border-box;

  opacity: calc((var(--edge-proximity) - var(--color-sensitivity)) / (100 - var(--color-sensitivity)));

  -webkit-mask-image:
    conic-gradient(from var(--cursor-angle) at center,
      black calc(var(--cone-spread) * 1%),
      transparent calc((var(--cone-spread) + 15) * 1%),
      transparent calc((100 - var(--cone-spread) - 15) * 1%),
      black calc((100 - var(--cone-spread)) * 1%));
  mask-image:
    conic-gradient(from var(--cursor-angle) at center,
      black calc(var(--cone-spread) * 1%),
      transparent calc((var(--cone-spread) + 15) * 1%),
      transparent calc((100 - var(--cone-spread) - 15) * 1%),
      black calc((100 - var(--cone-spread)) * 1%));
}

/* soft mesh fill bleeding in from the edges */
.bglow::after {
  border: 1px solid transparent;
  background:
    var(--gradient-one) padding-box,
    var(--gradient-two) padding-box,
    var(--gradient-three) padding-box,
    var(--gradient-four) padding-box,
    var(--gradient-five) padding-box,
    var(--gradient-six) padding-box,
    var(--gradient-seven) padding-box,
    var(--gradient-base) padding-box;

  -webkit-mask-image:
    radial-gradient(ellipse at 50% 50%, transparent 42%, black 78%),
    conic-gradient(from var(--cursor-angle) at center, transparent 5%, black 15%, black 85%, transparent 95%);
  -webkit-mask-composite: source-in;
  mask-image:
    radial-gradient(ellipse at 50% 50%, transparent 42%, black 78%),
    conic-gradient(from var(--cursor-angle) at center, transparent 5%, black 15%, black 85%, transparent 95%);
  mask-composite: intersect;

  opacity: calc(var(--fill-opacity) * (var(--edge-proximity) - var(--color-sensitivity)) / (100 - var(--color-sensitivity)));
  mix-blend-mode: soft-light;
}

/* outer glow layer (extends beyond the card via negative inset) */
.bglow > .edge-light {
  inset: calc(var(--glow-padding) * -1);
  z-index: 1;

  -webkit-mask-image:
    conic-gradient(from var(--cursor-angle) at center, black 2.5%, transparent 10%, transparent 90%, black 97.5%);
  mask-image:
    conic-gradient(from var(--cursor-angle) at center, black 2.5%, transparent 10%, transparent 90%, black 97.5%);

  opacity: calc((var(--edge-proximity) - var(--edge-sensitivity)) / (100 - var(--edge-sensitivity)));
  mix-blend-mode: plus-lighter;
}

.bglow > .edge-light::before {
  content: "";
  position: absolute;
  inset: var(--glow-padding);
  border-radius: inherit;
  box-shadow:
    inset 0 0 0 1px var(--glow-color),
    inset 0 0 1px 0 var(--glow-color-60),
    inset 0 0 3px 0 var(--glow-color-50),
    inset 0 0 6px 0 var(--glow-color-40),
    inset 0 0 15px 0 var(--glow-color-30),
    inset 0 0 25px 2px var(--glow-color-20),
    inset 0 0 50px 2px var(--glow-color-10),
    0 0 1px 0 var(--glow-color-60),
    0 0 3px 0 var(--glow-color-50),
    0 0 6px 0 var(--glow-color-40),
    0 0 15px 0 var(--glow-color-30),
    0 0 25px 2px var(--glow-color-20),
    0 0 50px 2px var(--glow-color-10);
}

@media (prefers-reduced-motion: reduce) {
  .bglow::before,
  .bglow::after,
  .bglow > .edge-light { transition: none; }
}