/* ============================================================
   课程（公益授课）页样式
   ============================================================ */

.lecture-hero { padding: 40px 0 6px; }
.lecture-kicker { margin: 14px 0 9px; font-family: var(--mono); font-size: 12px; font-weight: 600; letter-spacing: 0.24em; color: var(--orange); }
.lecture-hero h1 { font-size: 43px; font-weight: 800; line-height: 1.26; }
.lecture-sub { margin-top: 13px; max-width: 660px; font-size: 15.5px; color: var(--ink-soft); }
.lecture-rules {
  display: flex;
  max-width: 640px;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.lecture-rules > div { flex: 1; padding: 16px 20px; border-right: 1px solid var(--line); }
.lecture-rules > div:last-child { border-right: none; }
.lecture-rules b { display: block; font-size: 25px; font-weight: 800; color: var(--orange); line-height: 1.2; }
.lecture-rules span { font-family: var(--mono); font-size: 11.5px; color: var(--ink-soft); }

/* 授课现场横向图轨（自动循环滚动） */
.photo-carousel { position: relative; }
.photo-carousel::before,
.photo-carousel::after {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 12px;
  width: 54px;
  z-index: 3;
  pointer-events: none;
}
.photo-carousel::before { left: 0; background: linear-gradient(90deg, var(--bg-soft) 12%, rgba(232, 238, 245, 0)); }
.photo-carousel::after { right: 0; background: linear-gradient(270deg, var(--bg-soft) 12%, rgba(232, 238, 245, 0)); }
.pc-track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-behavior: auto;
  padding: 4px 4px 12px;
}
.pc-item {
  flex: 0 0 330px;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.pc-track:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
.pc-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--orange-line); }
.pc-item img { width: 100%; height: 220px; object-fit: cover; }
.pc-item figcaption { padding: 9px 13px; font-size: 12.5px; color: var(--ink-soft); }
.pc-nav {
  position: absolute;
  top: 100px;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--ink);
  font-size: 21px;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.16s, color 0.16s, border-color 0.16s;
}
.pc-nav:hover { background: linear-gradient(135deg, var(--orange), var(--orange-2)); color: #fff; border-color: transparent; }
.pc-prev { left: -14px; }
.pc-next { right: -14px; }

/* 课程主题 + 预约表单 */
.lecture-grid { display: grid; grid-template-columns: minmax(0, 1fr) 390px; gap: 40px; align-items: start; }
.lecture-info .blk-title:first-child { margin-top: 0; }
.topic-list { display: flex; flex-direction: column; }
.topic-item { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px dashed var(--line-2); }
.topic-item:last-child { border-bottom: none; }
.topic-item b { font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--orange); padding-top: 3px; min-width: 40px; }
.topic-item h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 3px; }
.topic-item p { font-size: 13.5px; color: var(--ink-soft); }
.lecture-form-wrap { position: sticky; top: 116px; }

@media (max-width: 1080px) {
  .lecture-grid { grid-template-columns: 1fr; }
  .lecture-form-wrap { position: static; }
  .lecture-hero h1 { font-size: 34px; }
}
@media (max-width: 720px) {
  .pc-item { flex: 0 0 82%; }
  .pc-nav { display: none; }
  .lecture-rules { flex-direction: column; }
  .lecture-rules > div { border-right: none; border-bottom: 1px solid var(--line); }
  .lecture-rules > div:last-child { border-bottom: none; }
}