* { -webkit-tap-highlight-color: transparent; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: #f5f5f5;
  margin: 0;
}

/* 按钮 */
.grad-btn { background: linear-gradient(135deg, #ff3b3b 0%, #ff7200 100%); }
.grad-btn:active { opacity: .85; transform: scale(.98); }

/* 输入框焦点 */
input:focus {
  outline: none;
  border-color: #ff5a00 !important;
  box-shadow: 0 0 0 2px rgba(255,90,0,.18);
}

/* 抖动动画 */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%,60% { transform: translateX(-5px); }
  40%,80% { transform: translateX(5px); }
}
.shake { animation: shake .38s; }

/* 淡入动画 */
@keyframes fadein {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fadein { animation: fadein .45s ease both; }

/* 扫光动画 */
@keyframes shimmer {
  0%   { left: -60%; }
  100% { left: 120%; }
}
.btn-shine { position: relative; overflow: hidden; }
.btn-shine::after {
  content: '';
  position: absolute;
  top: 0; left: -60%;
  width: 40%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.35), transparent);
  animation: shimmer 2s infinite;
}

/* 呼吸阴影 */
@keyframes pulse-shadow {
  0%,100% { box-shadow: 0 4px 18px rgba(255,90,0,.4); }
  50%     { box-shadow: 0 4px 28px rgba(255,90,0,.75); }
}
.btn-pulse { animation: pulse-shadow 1.8s ease-in-out infinite; }

/* 落地页图片 */
.promo-img { display: block; width: 100%; }