:root {
  --ink: #17212a;
  --muted: #607483;
  --blue: #19a9df;
  --blue-deep: #087eb4;
  --gold: #f2b83f;
  --panel: rgba(224, 248, 255, 0.46);
  --panel-strong: rgba(255, 255, 255, 0.72);
  --line: rgba(255, 255, 255, 0.62);
  --shadow: 0 18px 42px rgba(33, 129, 167, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  display: grid;
  min-height: 100vh;
  margin: 0;
  place-items: center;
  overflow-x: hidden;
  background: #bdefff;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

button {
  font: inherit;
  cursor: pointer;
}

img {
  display: block;
  width: 100%;
}

.stage {
  position: relative;
  width: min(100vw, calc(100vh * 1.78125));
  aspect-ratio: 2280 / 1280;
  overflow: hidden;
  background: url("图片/背景.jpg") center / cover no-repeat;
  box-shadow: 0 24px 70px rgba(23, 73, 105, 0.2);
}

.brand-title {
  position: absolute;
  top: 8.2%;
  left: 17.2%;
  z-index: 2;
  margin: 0;
  color: #ffffff;
  font-size: clamp(1.9rem, 4.5vw, 5.8rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1;
  text-shadow:
    0 4px 0 rgba(8, 126, 180, 0.42),
    0 12px 28px rgba(8, 126, 180, 0.32);
  white-space: nowrap;
}

.prize-preview {
  position: absolute;
  top: 16.4%;
  right: 5.8%;
  z-index: 2;
  display: flex;
  flex-direction: column;
  width: 44.6%;
  height: 64.8%;
  padding: clamp(0.6rem, 1.8vw, 2.1rem);
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 2vw;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.26), rgba(255, 255, 255, 0.08));
  backdrop-filter: blur(2px);
}

.preview-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 0 0.6rem;
}

.preview-heading p,
.eyebrow {
  margin: 0;
  color: var(--blue-deep);
  font-size: clamp(0.48rem, 0.9vw, 0.95rem);
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.preview-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1rem, 2.1vw, 2.4rem);
  letter-spacing: 0;
  white-space: nowrap;
}

.prize-grid {
  display: grid;
  flex: 1;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: 1fr 1fr;
  gap: clamp(0.45rem, 1vw, 1rem);
  min-height: 0;
}

.prize-card {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1vw;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.prize-card img {
  height: 72%;
  object-fit: cover;
}

.prize-card h3 {
  margin: 0;
  padding: 0.48rem 0.65rem;
  font-size: clamp(0.66rem, 1.15vw, 1.25rem);
  line-height: 1.2;
}

.prize-card-large {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
}

.prize-card-large img {
  height: 68%;
}

.prize-card-large div {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  padding: 0.7rem 0.8rem;
}

.prize-card-large h3 {
  padding: 0;
  font-size: clamp(0.9rem, 1.55vw, 1.75rem);
}

.prize-card-large p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: clamp(0.58rem, 0.95vw, 1.05rem);
  line-height: 1.6;
}

.stage-redeem {
  position: absolute;
  left: 42.8%;
  bottom: 4.7%;
  z-index: 3;
  display: grid;
  width: 15.4%;
  height: 5.8%;
  place-items: center;
  border: 0;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(180deg, #38c9f6 0%, #109fdd 100%);
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.42),
    0 12px 26px rgba(7, 126, 180, 0.24);
  font-size: clamp(0.72rem, 1.45vw, 1.7rem);
  font-weight: 900;
  letter-spacing: 0;
  text-shadow: 0 2px 6px rgba(0, 88, 130, 0.28);
}

.watermark-mask {
  position: absolute;
  right: 0;
  bottom: 0;
  z-index: 2;
  width: 14%;
  height: 8.5%;
  background: linear-gradient(135deg, rgba(229, 251, 255, 0.82), rgba(198, 240, 252, 0.92));
  filter: blur(0.2px);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: none;
  place-items: center;
  padding: 1rem;
}

.modal.is-open {
  display: grid;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 45, 64, 0.5);
  backdrop-filter: blur(10px);
}

.modal-panel {
  position: relative;
  z-index: 1;
  width: min(26rem, 100%);
  padding: 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 1rem;
  background: rgba(255, 253, 249, 0.96);
  box-shadow: 0 24px 60px rgba(12, 64, 89, 0.24);
}

.modal-close {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid rgba(23, 33, 42, 0.12);
  border-radius: 50%;
  color: var(--ink);
  background: #fff;
  font-size: 1.4rem;
  line-height: 1;
}

.modal-panel h2 {
  margin: 0.55rem 2.4rem 1rem 0;
  font-size: 1.6rem;
}

.qr-box {
  display: grid;
  width: min(13rem, 72vw);
  aspect-ratio: 1 / 1;
  margin: 1rem auto;
  place-items: center;
  border: 1px dashed rgba(8, 126, 180, 0.5);
  border-radius: 0.75rem;
  color: var(--blue-deep);
  background: linear-gradient(135deg, #e8fbff, #ffffff);
  font-weight: 900;
}

.wechat-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 0.65rem;
  background: rgba(232, 247, 252, 0.9);
}

.wechat-box span,
.modal-note {
  color: var(--muted);
}

.wechat-box strong {
  color: var(--ink);
}

.modal-note {
  margin: 1rem 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
}

:focus-visible {
  outline: 3px solid rgba(25, 169, 223, 0.44);
  outline-offset: 3px;
}

body.modal-locked {
  overflow: hidden;
}

@media (max-width: 760px) {
  body {
    align-items: start;
    background: #bdefff;
  }

  .stage {
    width: 100vw;
    min-height: 100vh;
    aspect-ratio: auto;
    background-position: 28% top;
    background-size: auto 100vh;
  }

  .brand-title {
    top: 9%;
    left: 9%;
    font-size: 2.45rem;
  }

  .prize-preview {
    top: 34%;
    right: 4%;
    left: 4%;
    width: auto;
    height: 43%;
    padding: 0.8rem;
    border-radius: 1rem;
    background: rgba(225, 248, 255, 0.74);
  }

  .preview-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.15rem;
  }

  .preview-heading h2 {
    font-size: 1.45rem;
  }

  .prize-grid {
    grid-template-columns: 1fr 1fr;
  }

  .prize-card-large {
    grid-column: span 2;
    grid-row: auto;
  }

  .prize-card img {
    height: 68%;
  }

  .prize-card-large {
    display: grid;
    grid-template-columns: 0.8fr 1fr;
  }

  .prize-card-large img {
    height: 100%;
  }

  .stage-redeem {
    left: 29%;
    bottom: 4.7%;
    width: 42%;
    height: 6.2%;
    font-size: 1.05rem;
  }

  .watermark-mask {
    width: 28%;
    height: 7%;
  }
}