/* 首页购买框 + 付款弹窗（规格 026）。沿用首页颜色变量，只在首页加载 */

.buy {
  align-self: start;
  padding: 20px 20px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
  scroll-margin-top: 84px;
}
.buy-h { margin: 0 0 12px; font-size: 19px; line-height: 1.3; letter-spacing: 0; }

.buy-tiers { display: grid; gap: 8px; margin-bottom: 14px; }
.tier {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 16px;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: #fff;
  cursor: pointer;
  transition: border-color .15s, background-color .15s;
}
.tier:hover { border-color: var(--green-ink); }
.tier input { position: absolute; opacity: 0; pointer-events: none; }
.tier:has(input:checked) { border-color: var(--green-ink); background: var(--tint); box-shadow: inset 0 0 0 1px var(--green); }
.tier:has(input:focus-visible) { outline: 2px solid var(--green-ink); outline-offset: 2px; }
.t-name { grid-column: 1; font-size: 15px; font-weight: 700; }
.t-note { grid-column: 1; font-size: 12.5px; color: var(--muted); }
.t-price { grid-column: 2; grid-row: 1; justify-self: end; font-size: 13px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.t-price b { font-size: 21px; font-weight: 800; color: var(--ink); letter-spacing: -.01em; }
.t-usd { grid-column: 2; grid-row: 2; justify-self: end; font-size: 12px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }

.buy-form { display: grid; gap: 10px; }
.buy-field { display: block; }
.buy-field span { display: block; margin-bottom: 5px; font-size: 13px; font-weight: 700; color: var(--text-2); }
.buy-field input {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  caret-color: var(--green-ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.buy-field input::placeholder { color: var(--faint); }
.buy-field input:focus { border-color: var(--green-ink); box-shadow: 0 0 0 3px rgba(0, 168, 90, .22); }
.buy-check { display: block; font-size: 13px; line-height: 1.5; color: var(--text-2); cursor: pointer; }
.buy-check input { width: 16px; height: 16px; margin: 0 7px 0 0; vertical-align: -3px; accent-color: var(--green-ink); }
.buy-check a { color: var(--green-ink); text-decoration: underline; text-underline-offset: 2px; }

.buy-btn {
  display: block;
  width: 100%;
  min-height: 50px;
  padding: 0 18px;
  border: 0;
  border-radius: 11px;
  font: inherit;
  font-size: 19px;
  font-weight: 800;
  line-height: 50px;
  text-align: center;
  text-decoration: none;
  color: #fff;
  background: var(--green);
  cursor: pointer;
  transition: background-color .15s, opacity .15s;
}
.buy-btn:hover { background: var(--green-dark); }
.buy-btn:disabled { opacity: .45; cursor: not-allowed; }
.buy-msg { margin: 0; font-size: 14px; font-weight: 700; color: var(--warn); }
.buy-note { margin: 0; font-size: 12px; line-height: 1.6; color: var(--faint); }

/* 付款弹窗：手机从底部弹出，电脑居中 */
body.pay-open { overflow: hidden; }
.pay-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(16, 24, 20, .55);
  animation: pay-fade .18s ease-out;
}
.pay-panel {
  position: relative;
  width: 100%;
  max-width: 460px;
  max-height: 92vh;
  overflow: auto;
  padding: 18px 18px calc(22px + env(safe-area-inset-bottom));
  color: var(--ink);
  background: #fff;
  border-radius: 18px 18px 0 0;
  box-shadow: 0 -8px 32px rgba(16, 24, 20, .18);
  animation: pay-up .22s ease-out;
}
@media (min-width: 600px) {
  .pay-modal { align-items: center; }
  .pay-panel { padding: 22px; border-radius: 18px; box-shadow: 0 16px 48px rgba(16, 24, 20, .24); }
}
@keyframes pay-fade { from { opacity: 0; } }
@keyframes pay-up { from { transform: translateY(24px); opacity: .4; } }
@media (prefers-reduced-motion: reduce) {
  .pay-modal, .pay-panel { animation: none; }
  .tier, .buy-btn { transition: none; }
}
.pay-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 10px;
  font-size: 24px;
  line-height: 1;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}
.pay-close:hover { background: var(--soft); }
.pay-tabs { display: flex; gap: 4px; padding: 4px; margin: 4px 42px 16px 0; background: var(--soft); border: 1px solid var(--line); border-radius: 12px; }
.pay-tab {
  flex: 1;
  min-width: 0;
  height: 38px;
  padding: 0 4px;
  border: 0;
  border-radius: 9px;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}
.pay-tab.on { color: #fff; background: var(--green); }
.pay-body { text-align: center; }
.pay-amount { margin: 0 0 12px; font-size: 28px; font-weight: 800; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.pay-qr { width: 220px; max-width: 70vw; margin: 0 auto 10px; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.pay-qr svg { display: block; width: 100%; height: auto; }
.pay-hint, .pay-countdown, .pay-note, .pay-backup { margin: 7px 0; font-size: 13px; color: var(--muted); }
.pay-countdown { font-variant-numeric: tabular-nums; }
.pay-note { margin-top: 12px; font-weight: 700; color: var(--ink); }
.pay-link { padding: 0 0 0 4px; border: 0; font: inherit; color: var(--green-ink); text-decoration: underline; background: none; cursor: pointer; }
.pay-open-alipay { margin: 10px 0 4px; }
.pay-wechat-tip {
  margin: 0 0 12px;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.7;
  text-align: left;
  border: 1px solid #e5cda5;
  border-radius: 12px;
  background: #fbf4e6;
}
.pay-loading, .pay-ok { margin: 0; padding: 36px 0; font-weight: 700; color: var(--muted); }
.pay-ok { color: var(--green-ink); }
.pay-error { margin: 0; padding: 18px 0 12px; font-weight: 700; color: var(--warn); }
.pay-embed { min-height: 360px; text-align: left; background: #fff; border-radius: 12px; overflow: hidden; }
.pay-mock-card { padding: 48px 12px; border: 1px dashed var(--line-strong); border-radius: 12px; color: var(--muted); }