* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: #0f172a;
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.header {
  text-align: center;
  font-size: 20px;
  font-weight: bold;
  color: #38bdf8;
}

.main-card {
  background: #1e293b;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.main-card h2 {
  font-size: 18px;
  margin-bottom: 20px;
  color: #e2e8f0;
}

.input-group {
  margin-bottom: 16px;
}

.input-group label {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
  color: #94a3b8;
}

.input-group input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid #334155;
  background: #0f172a;
  color: #fff;
  font-size: 15px;
  outline: none;
}

.input-group input:focus {
  border-color: #38bdf8;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 8px;
  background: #0284c7;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #0369a1;
}

.qr-container {
  margin-top: 20px;
  text-align: center;
}

.qr-container.hidden {
  display: none;
}

.qr-container img {
  width: 160px;
  height: 160px;
  margin-top: 10px;
  border-radius: 8px;
}

/* ===== 下载 APP 送福利样式 ===== */
.app-download-card {
  background: linear-gradient(135deg, #1e1b4b 0%, #311042 100%);
  border: 1px solid #6366f1;
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.2);
}

.app-download-card .badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: #ef4444;
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 2px 8px;
  border-radius: 12px;
}

.app-download-card h3 {
  font-size: 18px;
  color: #fbbf24;
  margin-bottom: 12px;
}

.reward-info {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
}

.reward-item {
  display: flex;
  flex-direction: column;
}

.reward-num {
  font-size: 22px;
  font-weight: 800;
  color: #38bdf8;
}

.reward-unit {
  font-size: 12px;
  color: #cbd5e1;
}

.plus-sign {
  font-size: 20px;
  font-weight: bold;
  color: #a855f7;
}

.app-download-card .desc {
  font-size: 13px;
  color: #94a3b8;
  margin-bottom: 16px;
  line-height: 1.4;
}

.btn-download {
  display: block;
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, #a855f7, #ec4899);
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: bold;
  transition: opacity 0.2s;
}

.btn-download:hover {
  opacity: 0.9;
}

/* 合作伙伴与底部样式 */
.partners-section {
  text-align: center;
  margin-top: 10px;
}

.partners-section p {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 12px;
}

.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.partners-grid img {
  height: 24px;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.partners-grid img:hover {
  opacity: 1;
}