/* qa.css — 「问/答」区块样式（跟课页风格无关的自带样式，可被课页覆盖） */
.qa-block {
  margin: 48px auto 0;
  max-width: 760px;
  padding: 20px 22px 24px;
  border-top: 1px solid #e7e3dd;
  color: #1c1b19;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.qa-block .qa-h { font-size: 22px; margin: 0 0 4px; }
.qa-block .qa-sub { color: #6b6660; font-size: 14px; margin: 0 0 18px; }
.qa-block .qa-empty { color: #8b857e; font-size: 14px; margin: 0 0 18px; }
.qa-block .qa-item { background: #fff; border: 1px solid #e7e3dd; border-radius: 12px; padding: 16px 18px; margin: 0 0 12px; }
.qa-block .qa-q { font-size: 17px; font-weight: 600; margin: 0 0 8px; }
.qa-block .qa-q a { color: inherit; text-decoration: none; }
.qa-block .qa-q a:hover { text-decoration: underline; }
.qa-block .qa-a p { margin: 0 0 8px; }
.qa-block .qa-a .qa-a-lead { font-weight: 600; }
.qa-block .qa-meta { color: #8b857e; font-size: 12px; margin: 8px 0 0; word-break: break-all; }
.qa-block .qa-form { background: #fff; border: 1px solid #e7e3dd; border-radius: 12px; padding: 16px 18px; }
.qa-block .qa-label { display: block; font-size: 13px; color: #6b6660; margin: 0 0 4px; }
.qa-block textarea, .qa-block input[type=email] {
  width: 100%; box-sizing: border-box; border: 1px solid #d9d4cd; border-radius: 8px;
  padding: 10px 12px; font: inherit; background: #fdfdfc; margin: 0 0 14px;
}
.qa-block textarea:focus, .qa-block input[type=email]:focus { outline: 2px solid #0b62d6; outline-offset: 1px; }
.qa-block .qa-note { color: #8b857e; font-size: 12px; margin: -6px 0 14px; }
.qa-block .qa-send {
  border: 0; border-radius: 8px; padding: 10px 18px; font: inherit; font-weight: 600;
  background: #0b62d6; color: #fff; cursor: pointer;
}
.qa-block .qa-send[disabled] { opacity: .6; cursor: default; }
.qa-block .qa-msg { margin: 12px 0 0; font-size: 14px; min-height: 1.2em; }
.qa-block .qa-msg-ok { color: #16704a; }
.qa-block .qa-msg-err { color: #b3261e; }