* { box-sizing: border-box; }

:root {
  --primary: #2f6fed;
  --primary-dark: #1f4fc0;
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e3e6ec;
  --danger: #e0403f;
  --success: #1fa974;
}

body {
  margin: 0;
  overflow-x: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  padding: 28px 20px 16px;
  text-align: center;
}

.topbar h1 {
  font-size: 20px;
  margin: 0;
  color: var(--primary-dark);
  letter-spacing: 1px;
}

.card {
  background: var(--card-bg);
  margin: 0 16px 24px;
  padding: 24px 20px 28px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(20, 30, 60, 0.06);
  flex: 1;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 20px;
  line-height: 1.6;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.field > span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.field select,
.field input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px; /* >=16px 避免 iOS 聚焦输入框时自动放大页面 */
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  appearance: none;
  -webkit-appearance: none;
}

.field select:focus,
.field input:focus {
  outline: none;
  border-color: var(--primary);
}

.field select:disabled {
  color: var(--muted);
  background: #f7f8fa;
}

.fee-hint {
  background: #eef4ff;
  color: var(--primary-dark);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  margin: -6px 0 16px;
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin: -6px 0 14px;
}

.btn-primary {
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary:disabled {
  background: #b7c3e0;
  cursor: not-allowed;
}

.pay-summary {
  background: #f7f9fc;
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 20px;
}

.pay-summary p {
  display: flex;
  justify-content: space-between;
  margin: 6px 0;
  font-size: 14px;
}

.pay-summary p span {
  color: var(--muted);
}

.pay-summary .amount {
  color: var(--danger);
  font-size: 18px;
}

.order-no {
  font-size: 12px;
  color: var(--muted);
  word-break: break-all;
}

.qr-wrap {
  text-align: center;
  margin-bottom: 20px;
}

.qr-wrap img {
  width: 220px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  background: #fff;
}

.qr-tip {
  color: var(--muted);
  font-size: 13px;
  margin-top: 10px;
}

.done-box {
  text-align: center;
  padding: 30px 0;
}

.done-icon {
  width: 56px;
  height: 56px;
  line-height: 56px;
  border-radius: 50%;
  background: var(--success);
  color: #fff;
  font-size: 28px;
  margin: 0 auto 16px;
}

.done-box p {
  margin: 6px 0;
}