/* ============================================================
   sponsor.css · 独立赞助页：双 QR 码 + 品牌色卡片 + lightbox
   ============================================================ */

.sponsor-hero {
  text-align: center;
  margin-bottom: 56px;
}

.sponsor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

@media (max-width: 720px) {
  .sponsor-grid { grid-template-columns: 1fr; gap: 22px; }
}

.qr-card {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3vw, 36px);
  text-align: center;
  transition: transform 0.5s var(--spring);
}

.qr-card:hover { transform: translateY(-6px); }

.qr-card .liquid-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.qr-card .qr-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.qr-card .qr-brand svg,
.qr-card .qr-brand img {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.qr-card .qr-brand img {
  border-radius: 9px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
  object-fit: cover;
}

.qr-logo {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: #fff;
  flex-shrink: 0;
  letter-spacing: -0.02em;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

.alipay-logo {
  background: linear-gradient(135deg, #1677ff 0%, #0958d9 100%);
}

.wechat-logo {
  background: linear-gradient(135deg, #07c160 0%, #04a850 100%);
}

.qr-card.alipay .qr-brand { color: #1677ff; }
.qr-card.wechat .qr-brand { color: #07c160; }

.qr-card .qr-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: -8px;
}

.qr-card.alipay .qr-tag {
  background: rgba(22, 119, 255, 0.12);
  color: #1677ff;
}

.qr-card.wechat .qr-tag {
  background: rgba(7, 193, 96, 0.12);
  color: #07c160;
}

.qr-frame {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1 / 1;
  background: #fff;
  border-radius: var(--r-md);
  padding: 16px;
  box-shadow:
    0 1px 0 var(--glass-hi) inset,
    0 18px 40px rgba(24, 40, 84, 0.18),
    0 0 0 1px var(--glass-border);
  cursor: zoom-in;
  transition: transform 0.5s var(--spring), box-shadow 0.4s var(--ease-apple);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-frame:hover {
  transform: scale(1.03);
  box-shadow:
    0 1px 0 var(--glass-hi) inset,
    0 28px 56px rgba(24, 40, 84, 0.28),
    0 0 0 1px var(--glass-border);
}

.qr-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  image-rendering: -webkit-optimize-contrast;
}

.qr-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-top: 4px;
}

.qr-desc {
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 280px;
}

/* ----- 感谢语 ----- */
.thanks-card {
  padding: clamp(24px, 3.4vw, 40px);
  text-align: center;
}

.thanks-card .thanks-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff9ecb, #b18cff);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 18px;
  box-shadow: 0 10px 24px rgba(177, 140, 255, 0.45);
}

.thanks-card .thanks-icon svg { width: 30px; height: 30px; }

.thanks-card h3 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.thanks-card p {
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.85;
  max-width: 620px;
  margin: 0 auto;
}

/* ----- Lightbox ----- */
.qr-lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.78);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  padding: 32px;
  cursor: zoom-out;
}

.qr-lightbox.is-open { display: flex; }

.qr-lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--r-md);
  background: #fff;
  padding: 18px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  animation: qrPop 0.4s var(--spring);
}

@keyframes qrPop {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}