html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Open Sans', sans-serif;
  color: #fff;
}

.bg_gradient {
  background:
    radial-gradient(ellipse at 50% 38%, rgba(137, 191, 212, 0.18), transparent 42%),
    linear-gradient(to bottom, #1c1c1c 0%, #2e2a27 40%, #212120 150%),
    linear-gradient(to top, rgba(255, 255, 255, 0.40) 0%, rgb(0 0 0 / 53%) 200%);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
}

.watermark {
  position: fixed;
  z-index: 0;
  left: 50%;
  top: 46%;
  width: min(920px, 148vw);
  aspect-ratio: 551 / 495;
  transform: translate(-50%, -46%);
  pointer-events: none;
  background: url("../img/img-1.png") center / cover no-repeat;
  opacity: 0.42;
  -webkit-mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, #000 28%, rgba(0, 0, 0, 0.72) 58%, transparent 86%);
  mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, #000 28%, rgba(0, 0, 0, 0.72) 58%, transparent 86%);
}

.watermark::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 26% 22% at 40% 32%, rgba(255, 255, 255, 0.7), transparent 58%),
    radial-gradient(ellipse 48% 44% at 56% 64%, rgba(0, 0, 0, 0.72), transparent 70%);
}

.sheet {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  width: min(26rem, calc(100% - 2rem));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 0 11vh;
  animation: rise 0.7s ease both;
}

.logo {
  width: 100%;
  height: auto;
  background: transparent;
  filter: drop-shadow(0 2px 1px rgba(255, 255, 255, 0.18)) drop-shadow(0 12px 14px rgba(0, 0, 0, 0.55));
}

.card {
  margin-top: 2.25rem;
  padding: 0.95rem 1.45rem 1.15rem;
  border-radius: 2.4rem;
  background: rgba(255, 255, 255, 0.14);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.42),
    inset 0 -12px 18px rgba(0, 0, 0, 0.16),
    0 16px 28px rgba(0, 0, 0, 0.34);
}

.place {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.88);
}

.line {
  width: 4.5rem;
  height: 1px;
  margin: 0.85rem auto 0.75rem;
  background: rgba(255, 209, 64, 0.55);
}

.detail {
  margin: 0.18rem 0;
  font-size: 0.95rem;
}

.detail span {
  color: #89bfd4;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-right: 0.35rem;
}

.detail a {
  color: #fff;
  text-decoration: none;
}

.detail a:hover {
  color: #89bfd4;
}

.button_donate {
  display: inline-block;
  margin-top: 1.15rem;
  min-width: 6rem;
  text-align: center;
  font-size: 1.05rem;
  line-height: 1.5rem;
  font-weight: 600;
  padding: 0.55rem 1.7rem;
  background: rgb(255, 209, 64);
  color: rgb(0, 48, 135);
  border-radius: 50px;
  text-decoration: none;
}

.button_donate:hover {
  background: rgb(255, 232, 136);
  color: rgb(0, 48, 135);
}

.learn {
  display: block;
  margin: 0.85rem auto 0;
  padding: 0;
  border: 0;
  background: none;
  color: #89bfd4;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
}

.learn:hover {
  color: #fff;
}

dialog.about {
  position: fixed;
  top: auto;
  right: 0;
  bottom: 1rem;
  left: 0;
  width: min(36rem, calc(100% - 2rem));
  max-height: min(58vh, calc(100vh - 13rem));
  margin: 0 auto;
  overflow: auto;
  padding: 1.5rem 1.6rem 1.25rem;
  border: 0;
  border-radius: 1.6rem;
  background: rgba(28, 28, 28, 0.94);
  color: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.4);
}

.about::backdrop {
  background: linear-gradient(to bottom, transparent 0 30%, rgba(0, 0, 0, 0.45) 48%);
}

.about h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.about p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.65;
}

.about-close {
  display: block;
  margin: 1.1rem auto 0;
  padding: 0.4rem 1.1rem;
  border: 0;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.about-close:hover {
  background: rgba(255, 255, 255, 0.22);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sheet {
    animation: none;
  }
}