/**
 * Optical Capsule — reusable capsule / underlay / SVG layer styles.
 * Pair with OpticalCapsule.js on any page that hosts .capsule-stage and .optical-capsule.
 */

.svg-filter-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

body[data-bg-mode="image"] .optical-capsule {
  /*
   * In image mode the button is a frosted-glass window:
   * - Nearly transparent background (no dark gradient fill)
   * - Strong backdrop-filter lets the photo show through + blurs it
   * - Optical highlights (rim, spec) from canvas still apply via screen blend
   */
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07) 0%, rgba(255, 255, 255, 0.01) 55%, rgba(255, 255, 255, 0.04) 100%);
  backdrop-filter: blur(24px) saturate(1.5) brightness(1.04);
}

.capsule-stage {
  position: relative;
  width: var(--w);
  min-height: calc(var(--h) + var(--drop));
  margin-inline: auto;
}

.underlay-svg {
  position: absolute;
  left: calc(-1 * var(--underlay-pad-left, calc(var(--h) * 0.72)));
  top: calc(-1 * var(--underlay-pad-top, calc(var(--h) * 0.54)));
  z-index: 0;
  width: var(--underlay-w, calc(var(--w) + var(--h) * 1.45));
  height: var(--underlay-h, calc(var(--h) * 1.1));
  pointer-events: none;
  overflow: visible;
}

.optical-capsule {
  position: relative;
  z-index: 1;
  isolation: isolate;
  width: var(--w);
  height: var(--h);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: calc(var(--h) / 2);
  padding: 0 calc(var(--h) * 0.28);
  color: white;
  background:
    linear-gradient(180deg, rgba(24, 20, 16, 0.12), rgba(8, 6, 5, 0.08) 58%, rgba(0, 0, 0, 0.1));
  backdrop-filter: blur(14px) saturate(1.18);
  overflow: hidden;
}

.optical-capsule.optical-capsule--displace-backdrop {
  -webkit-backdrop-filter: url("#oc-backdrop-displace") blur(14px) saturate(1.18);
  backdrop-filter: url("#oc-backdrop-displace") blur(14px) saturate(1.18);
}

body[data-bg-mode="image"] .optical-capsule.optical-capsule--displace-backdrop {
  -webkit-backdrop-filter: url("#oc-backdrop-displace") blur(24px) saturate(1.5) brightness(1.04);
  backdrop-filter: url("#oc-backdrop-displace") blur(24px) saturate(1.5) brightness(1.04);
}

.optical-capsule span {
  position: relative;
  z-index: 4;
  font-size: var(--fs);
  font-weight: 430;
  line-height: 1;
  white-space: nowrap;
}

.optical-svg {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.optical-svg .screen {
  mix-blend-mode: screen;
}

.optical-svg .rim {
  mix-blend-mode: screen;
}

.size-xxs { --w: 128px; --h: 40px; --fs: 13px; --drop: 44px; --caustic: 0.38; }
.size-xs  { --w: 160px; --h: 50px; --fs: 15px; --drop: 54px; --caustic: 0.45; }
.size-s   { --w: 210px; --h: 64px; --fs: 18px; --drop: 68px; --caustic: 0.52; }
.size-m   { --w: 280px; --h: 84px; --fs: 24px; --drop: 88px; --caustic: 0.6; }
.size-l   { --w: 360px; --h: 112px; --fs: 31px; --drop: 118px; --caustic: 0.68; }
.size-xl  { --w: 430px; --h: 132px; --fs: 36px; --drop: 140px; --caustic: 0.76; }
.size-xxl { --w: 520px; --h: 160px; --fs: 44px; --drop: 170px; --caustic: 0.84; }

@media (max-width: 720px) {
  .capsule-stage {
    transform: scale(min(1, calc((100vw - 92px) / var(--w))));
    transform-origin: center center;
  }
}