/* ==========================================================================
   课程中心
   版式参照资源社区：行式列表 + 缩略图，详情为面包屑 + 元信息 + 目录树 + 下载区
   ========================================================================== */

/* ---------- 面包屑 ---------- */
.course-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #6f6f78;
  margin-bottom: 18px;
}

.course-crumb a {
  color: #8b8b95;
  transition: color 0.2s;
}

.course-crumb a:hover {
  color: #fff;
}

.course-crumb .current {
  color: #b9b9c2;
}

/* ---------- 列表头部 ---------- */
.course-list-head {
  padding-bottom: 18px;
  margin-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.course-list-head h1 {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.course-list-head p {
  margin-top: 8px;
  max-width: 640px;
  font-size: 12px;
  line-height: 1.85;
  color: #8b8b95;
}

.course-hot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}

.course-hot-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: #5e5e67;
}

.course-hot-tag {
  font-size: 11px;
  color: #9a9aa4;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 2px 8px;
  transition: all 0.2s;
}

.course-hot-tag:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
}

/* ---------- 行式列表 ---------- */
.course-list {
  display: flex;
  flex-direction: column;
}

.course-row {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.2s;
}

.course-row:hover {
  background: rgba(255, 255, 255, 0.018);
}

.course-thumb {
  flex: 0 0 132px;
  width: 132px;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  background: #000;
}

.course-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.course-row-body {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 2px;
}

.course-row-body h2 {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  line-height: 1.5;
}

.course-row-summary {
  font-size: 11.5px;
  line-height: 1.75;
  color: #8b8b95;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-row-meta {
  margin-top: auto;
  padding-top: 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: #5e5e67;
}

@media (max-width: 560px) {
  .course-thumb {
    flex-basis: 92px;
    width: 92px;
  }
  .course-row-body h2 {
    font-size: 14px;
  }
}

/* ---------- 分页 ---------- */
.course-pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 28px 0 8px;
}

.course-pager.hidden {
  display: none;
}

.course-pager-btn {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #b9b9c2;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  padding: 5px 12px;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.course-pager-btn:hover:not(:disabled) {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.course-pager-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.course-pager-info {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #5e5e67;
}

/* ---------- 详情 ---------- */
.course-topbar {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(9, 9, 12, 0.92);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 30;
}

.course-topbar-inner {
  max-width: 768px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.course-back,
.course-brand {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #8b8b95;
  transition: color 0.2s;
}

.course-back:hover,
.course-brand:hover {
  color: #fff;
}

.course-title {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 23px;
  line-height: 1.45;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px;
  color: #5e5e67;
}

.course-cover {
  margin: 20px 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 9;
  max-height: 320px;
}

.course-cover-slim {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.015);
}

.course-cover-slim-mark {
  font-size: 16px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.4);
}

.course-cover-slim-code {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #6f6f78;
}

.course-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.course-cover .course-cover-fallback {
  width: 100%;
  height: 100%;
}

.course-summary {
  font-size: 13.5px;
  line-height: 1.95;
  color: #b9b9c2;
}

.course-subtle {
  margin-top: 8px;
  font-size: 11px;
  color: #6f6f78;
}

.course-h2 {
  margin-top: 30px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

/* 目录树 */
.course-tree {
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.012);
  padding: 6px 14px;
}

.course-tree-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.course-tree-row:last-child {
  border-bottom: 0;
}

.course-tree-branch {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #44444c;
  user-select: none;
  flex-shrink: 0;
}

.course-tree-text {
  flex: 1;
  font-size: 12px;
  line-height: 1.7;
  color: #b9b9c2;
}

.course-tree-free {
  flex-shrink: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 9px;
  color: #d8d8de;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 3px;
  padding: 1px 5px;
}

/* 下载区 */
.course-dl {
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.012);
  padding: 4px 14px;
}

.course-dl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.course-dl-row:last-child {
  border-bottom: 0;
}

.course-dl-name {
  font-size: 12px;
  color: #e6e6ea;
}

.course-dl-sub {
  margin-top: 3px;
  font-size: 10.5px;
  color: #6f6f78;
}

.course-dl-lock {
  flex-shrink: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 9.5px;
  color: #6f6f78;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  padding: 3px 7px;
}

.course-note {
  margin-top: 10px;
  font-size: 11px;
  line-height: 1.8;
  color: #5e5e67;
}

/* 购买区 */
.course-buy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.course-buy-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.course-price {
  font-family: "JetBrains Mono", monospace;
  font-size: 22px;
  color: #fff;
}

.course-price-old {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #5e5e67;
}

.course-buy-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.course-buy-contact {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: #5e5e67;
}

.course-backlink {
  margin-top: 28px;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: #6f6f78;
}

.course-backlink a:hover {
  color: #fff;
}

/* 封面占位 */
.course-cover-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.08), transparent 62%),
    #0a0a0d;
  color: rgba(255, 255, 255, 0.5);
}

.course-cover-fallback .course-cover-mark {
  font-size: 26px;
  line-height: 1;
}

.course-cover-fallback .course-cover-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 8.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
}