.wechat-support-modal {
  width: min(440px, calc(100% - 32px));
  max-height: calc(100vh - 32px);
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--ui-border, #e2e8f0);
  border-radius: 18px;
  background: var(--ui-surface, #fff);
  color: var(--ui-text, #1e293b);
  box-shadow: 0 20px 64px rgba(15, 23, 42, .2);
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.wechat-support-modal[open] { display: flex; flex-direction: column; }
.wechat-support-modal::backdrop { background: rgba(15, 23, 42, .46); backdrop-filter: blur(3px); }
.wechat-support-modal * { box-sizing: border-box; }
.wechat-support-modal [hidden] { display: none !important; }
.wechat-support-heading { display: flex; flex-shrink: 0; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--ui-border, #e2e8f0); }
.wechat-support-heading img { flex: 0 0 36px; object-fit: contain; }
.wechat-support-titles { min-width: 0; }
.wechat-support-eyebrow { margin: 0 0 2px; font-size: 11px; color: var(--ui-text-muted, #64748b); }
.wechat-support-heading h2 { margin: 0; color: var(--ui-text, #0f172a); font-size: 16px; line-height: 1.5; font-weight: 600; }
.wechat-support-close { flex: 0 0 44px; display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; margin: -6px -8px -6px auto; padding: 0; border: 0; border-radius: 10px; background: transparent; color: var(--ui-text-muted, #64748b); line-height: 1; cursor: pointer; }
.wechat-support-close svg { display: block; flex: none; }
.wechat-support-content { flex: 1 1 auto; min-height: 0; padding: 20px 24px; overflow-y: auto; overscroll-behavior: contain; text-align: center; }
.wechat-support-content > p:first-child { margin: 0 0 16px; color: var(--ui-text-muted, #64748b); font-size: 13px; }
.wechat-support-qr-box { display: grid; place-items: center; width: 248px; max-width: 100%; aspect-ratio: 1; margin: 0 auto; background: #fff; border: 1px solid #e2e8f0; border-radius: 12px; overflow: hidden; }
.wechat-support-qr-box img { display: block; width: 100%; height: auto; }
.wechat-support-qr-state { padding: 20px; color: #64748b; font-size: 13px; }
.wechat-support-qr-state p { margin: 0; }
.wechat-support-qr-state button { margin-top: 10px; min-height: 44px; padding: 8px 16px; }
.wechat-support-scan { margin: 14px 0 4px; color: var(--ui-text, #0f172a); font-size: 13px; font-weight: 600; }
.wechat-support-mobile-hint { margin: 0; color: var(--ui-text-muted, #64748b); font-size: 12px; }
.wechat-support-link { border: 0; background: transparent; color: #2563eb; font-size: 12px; text-decoration: none; cursor: pointer; }
.wechat-support-link:hover { text-decoration: underline; }
.wechat-support-footer { display: flex; flex-shrink: 0; gap: 12px; padding: 16px 24px; border-top: 1px solid var(--ui-border, #e2e8f0); }
.wechat-support-save, .wechat-support-later { flex: 1; display: flex; align-items: center; justify-content: center; min-width: 0; min-height: 44px; padding: 10px 12px; border: 1px solid var(--ui-border, #e2e8f0); border-radius: 10px; font: inherit; font-size: 13px; font-weight: 600; text-decoration: none; cursor: pointer; touch-action: manipulation; }
.wechat-support-save { background: #15803d; border-color: #15803d; color: #fff; }
.wechat-support-save:hover { background: #166534; color: #fff; }
.wechat-support-save[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.wechat-support-save[aria-disabled="true"]:hover { background: #15803d; }
.wechat-support-later { background: var(--ui-surface, #fff); color: var(--ui-text-muted, #475569); }
.wechat-support-later:hover, .wechat-support-close:hover { background: var(--ui-surface-soft, #f1f5f9); color: var(--ui-text, #1e293b); }
.wechat-support-save:active, .wechat-support-later:active { transform: translateY(1px); }
.wechat-support-modal :focus-visible { outline: 2px solid #16a34a; outline-offset: 3px; }
.wechat-support-header { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 7px 10px; border: 1px solid var(--ui-border, #bbf7d0); border-radius: 8px; background: var(--ui-success-soft, #f0fdf4); color: var(--ui-success, #15803d); font-size: 12px; font-weight: 600; white-space: nowrap; cursor: pointer; }
.wechat-support-header:hover { filter: brightness(.96); }
@media (max-width: 640px) {
  .wechat-support-heading { padding: 16px; gap: 10px; }
  .wechat-support-heading h2 { font-size: 15px; }
  .wechat-support-content { padding: 18px 16px; }
  .wechat-support-qr-box { width: 228px; }
  .wechat-support-footer { padding: 14px 16px max(14px, env(safe-area-inset-bottom)); }
}
@media (max-height: 520px) and (min-width: 600px) {
  .wechat-support-heading { padding: 8px 20px; }
  .wechat-support-content { display: grid; grid-template-columns: 136px minmax(0, 1fr); align-items: center; column-gap: 18px; padding: 12px 20px; }
  .wechat-support-qr-box { grid-column: 1; grid-row: 1 / 4; width: 136px; }
  .wechat-support-content > p:first-child { grid-column: 2; grid-row: 1; margin: 0; font-size: 12px; }
  .wechat-support-scan { grid-column: 2; grid-row: 2; margin: 0; }
  .wechat-support-mobile-hint { grid-column: 2; grid-row: 3; }
  .wechat-support-footer { padding: 10px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  .wechat-support-modal button, .wechat-support-modal a { transition: none; }
  .wechat-support-save:active, .wechat-support-later:active { transform: none; }
}