/* =========================================================
   Border Glow CSS
   Romm Coffee — cursor-reactive glowing border for cards.

   Vanilla port of the ReactBits "Border Glow" effect, re-skinned
   to the teal brand and tuned for LIGHT cards (white surface,
   dark text). The whole effect is driven by two CSS variables
   that wwwroot/js/border-glow.js updates on pointer move:
     --edge-proximity  (0–100, how close the cursor is to an edge)
     --cursor-angle    (deg, direction of the cursor from centre)

   Markup:
     <article class="border-glow-card">
       <span class="edge-light" aria-hidden="true"></span>
       <div class="border-glow-inner"> …content… </div>
     </article>

   Works with: wwwroot/js/border-glow.js
========================================================= */

.border-glow-card {
  /* --- tunables (override inline per use if needed) --- */
  --edge-proximity: 0;
  --cursor-angle: 45deg;
  --edge-sensitivity: 30;
  --color-sensitivity: calc(var(--edge-sensitivity) + 20);
  --border-radius: var(--radius-xl, 1.5rem);
  --glow-padding: 40px;
  --cone-spread: 25;
  --fill-opacity: 0.5;
  --card-bg: var(--color-surface, #ffffff);

  /* --- brand teal glow (secondary #649EA1, brightened) --- */
  --glow-color:    hsl(184deg 44% 52% / 100%);
  --glow-color-60: hsl(184deg 44% 52% / 60%);
  --glow-color-50: hsl(184deg 44% 52% / 50%);
  --glow-color-40: hsl(184deg 44% 52% / 40%);
  --glow-color-30: hsl(184deg 44% 52% / 30%);
  --glow-color-20: hsl(184deg 44% 52% / 20%);
  --glow-color-10: hsl(184deg 44% 52% / 10%);

  /* --- brand mesh-gradient border colours (teal + brass) --- */
  --gradient-one:   radial-gradient(at 80% 55%, #79c2c2 0px, transparent 50%);
  --gradient-two:   radial-gradient(at 69% 34%, #649ea1 0px, transparent 50%);
  --gradient-three: radial-gradient(at 8% 6%,   #c79a4b 0px, transparent 50%);
  --gradient-four:  radial-gradient(at 41% 38%, #79c2c2 0px, transparent 50%);
  --gradient-five:  radial-gradient(at 86% 85%, #649ea1 0px, transparent 50%);
  --gradient-six:   radial-gradient(at 82% 18%, #c79a4b 0px, transparent 50%);
  --gradient-seven: radial-gradient(at 51% 4%,  #649ea1 0px, transparent 50%);
  --gradient-base:  linear-gradient(#79c2c2 0 100%);

  position: relative;
  border-radius: var(--border-radius);
  isolation: isolate;
  transform: translate3d(0, 0, 0.01px);
  display: grid;
  border: 1px solid var(--color-border, #e4e7ec);
  background: var(--card-bg);
  overflow: visible;
  box-shadow: var(--shadow-sm, 0 4px 12px rgba(16, 24, 40, 0.08));
}

.border-glow-card::before,
.border-glow-card::after,
.border-glow-card > .edge-light {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  transition: opacity 0.25s ease-out;
  z-index: -1;
}

/* Off until hovered; fade out gently when the cursor leaves. */
.border-glow-card:not(:hover)::before,
.border-glow-card:not(:hover)::after,
.border-glow-card:not(:hover) > .edge-light {
  opacity: 0;
  transition: opacity 0.75s ease-in-out;
}

/* Coloured mesh-gradient border, revealed near the cursor. */
.border-glow-card::before {
  border: 1px solid transparent;
  background:
    linear-gradient(var(--card-bg) 0 100%) padding-box,
    linear-gradient(rgb(255 255 255 / 0%) 0% 100%) border-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%)
    );
}

/* Coloured fill bleeding in from the edges (very subtle on light). */
.border-glow-card::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:
    linear-gradient(to bottom, black, black),
    radial-gradient(ellipse at 50% 50%, black 40%, transparent 65%),
    conic-gradient(from var(--cursor-angle) at center, transparent 5%, black 15%, black 85%, transparent 95%);
  -webkit-mask-composite: source-out;
  mask-image:
    linear-gradient(to bottom, black, black),
    radial-gradient(ellipse at 50% 50%, black 40%, transparent 65%),
    conic-gradient(from var(--cursor-angle) at center, transparent 5%, black 15%, black 85%, transparent 95%);
  mask-composite: subtract, add;

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

/* Outer + inner glow halo that tracks the cursor edge. */
.border-glow-card > .edge-light {
  inset: calc(var(--glow-padding) * -1);
  pointer-events: none;
  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;
}

.border-glow-card > .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);
}

.border-glow-inner {
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
  border-radius: inherit;
}

/* Padding preset for the feature-card demo content. */
.border-glow-inner.pad {
  padding: var(--space-6, 2rem);
}

/* --- Dark variant ---
   The glow (plus-lighter) is designed to bloom on a dark surface,
   so on the light homepage we give the cards a deep teal fill and
   light text; the teal/brass border then reads clearly. */
.border-glow-card.dark {
  --card-bg: #06414b;
  --fill-opacity: 0.9;
  --glow-color:    hsl(184deg 55% 62% / 100%);
  --glow-color-60: hsl(184deg 55% 62% / 60%);
  --glow-color-50: hsl(184deg 55% 62% / 50%);
  --glow-color-40: hsl(184deg 55% 62% / 40%);
  --glow-color-30: hsl(184deg 55% 62% / 30%);
  --glow-color-20: hsl(184deg 55% 62% / 20%);
  --glow-color-10: hsl(184deg 55% 62% / 10%);
  border-color: rgb(255 255 255 / 14%);
  box-shadow: var(--shadow-lg, 0 20px 40px rgba(5, 26, 30, 0.28));
}

.border-glow-card.dark .feature-title,
.border-glow-card.dark .contact-info-title {
  color: #ffffff;
}

.border-glow-card.dark .feature-text,
.border-glow-card.dark .contact-info-text,
.border-glow-card.dark .contact-info-text a {
  color: rgb(255 255 255 / 80%);
}

.border-glow-card.dark .feature-icon,
.border-glow-card.dark .contact-info-icon {
  background: rgb(255 255 255 / 12%);
}

/* Outline buttons need a light treatment on the dark fill. */
.border-glow-card.dark .btn-outline-custom {
  color: #ffffff;
  border-color: rgb(255 255 255 / 45%);
}

.border-glow-card.dark .btn-outline-custom:hover,
.border-glow-card.dark .btn-outline-custom:focus-visible {
  color: #ffffff;
  background: rgb(255 255 255 / 12%);
  border-color: #ffffff;
}

/* No cursor to track (touch) or reduced motion → stay a calm card. */
@media (hover: none), (prefers-reduced-motion: reduce) {
  .border-glow-card::before,
  .border-glow-card::after,
  .border-glow-card > .edge-light {
    display: none;
  }
}