/* Micro-lesson Video Review — /video10July.html */
* { box-sizing: border-box; }
body {
  margin: 0; font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei",
  system-ui, sans-serif; background: #f4f6fa; color: #1c2733;
}
.zh { display: block; color: #5b6b7c; font-weight: 400; }

.hd {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; background: #16324f; color: #fff;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { font-size: 30px; }
.brand-text h1 { margin: 0; font-size: 19px; }
.brand-text .zh { color: #b8c8d9; font-size: 13px; margin: 2px 0 0; }
.hd-right { display: flex; gap: 10px; align-items: center; }
.badge {
  background: rgba(255,255,255,.12); border-radius: 999px;
  padding: 5px 12px; font-size: 12px; color: #dbe7f3; text-decoration: none;
}
.badge-link:hover { background: rgba(255,255,255,.22); }

.main { max-width: 860px; margin: 0 auto; padding: 22px 16px 60px; }
.intro { line-height: 1.55; }

.tabs { display: flex; gap: 8px; margin: 18px 0 14px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid #c8d4e0; background: #fff; border-radius: 999px;
  padding: 8px 16px; font-size: 14px; cursor: pointer; color: #1c2733;
}
.tabs button.active { background: #16324f; color: #fff; border-color: #16324f; }

.card {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 12px;
  padding: 18px; margin-bottom: 18px; box-shadow: 0 1px 3px rgba(16,42,67,.06);
}
.card h2 { margin: 0 0 12px; font-size: 17px; }
video { width: 100%; border-radius: 8px; background: #000; }

.btnrow { margin-top: 12px; display: flex; gap: 10px; flex-wrap: wrap; }
.primary {
  background: #16324f; color: #fff; border: none; border-radius: 8px;
  padding: 10px 18px; font-size: 14px; cursor: pointer;
}
.primary:disabled { opacity: .55; cursor: default; }
.dl {
  display: inline-block; background: #eef3f9; border: 1px solid #c8d4e0;
  border-radius: 8px; padding: 10px 18px; font-size: 14px; color: #16324f;
  text-decoration: none;
}
.dl:hover, .primary:hover:not(:disabled) { filter: brightness(1.07); }

textarea {
  width: 100%; border: 1px solid #c8d4e0; border-radius: 8px; padding: 10px;
  font: inherit; resize: vertical;
}
.hint { color: #5b6b7c; font-size: 13px; line-height: 1.5; }
.msg { margin-top: 8px; font-size: 13px; min-height: 18px; }
.msg.ok { color: #17753c; }
.msg.err { color: #b3261e; }

.comments { list-style: none; margin: 16px 0 0; padding: 0; }
.comments li {
  border-top: 1px solid #edf1f6; padding: 10px 2px;
  white-space: pre-wrap; word-break: break-word; font-size: 14px;
}
.comments .when { color: #8595a6; font-size: 12px; display: block; margin-top: 4px; }
.comments .empty { color: #8595a6; font-style: italic; }