.course-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--line-dark);
  border-radius: 4px;
  overflow: hidden;
  padding: 0px;
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.06);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  border-color: #1a1a1a;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
}

.course-card[data-finish="foil"] {
  border-color: #8a7a58;
}

.course-card[data-finish="foil"]:hover {
  border-color: #c4b28a;
}

/* 右下角状态缎带：压制 / 精译。精译优先，和 data-finish 一致。 */
.course-status-ribbon {
  position: absolute;
  z-index: 3;
  right: -34px;
  bottom: 14px;
  width: 116px;
  padding: 5px 0;
  transform: rotate(-45deg);
  pointer-events: none;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1;
  text-align: center;
  text-shadow: 0 1px 1px rgba(100, 12, 12, 0.52);
  background: linear-gradient(180deg, #ff7167 0%, #e83831 52%, #bb1719 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(111, 7, 10, 0.7);
  box-shadow:
    inset 0 1px 1px rgba(255, 255, 255, 0.42),
    0 2px 3px rgba(97, 16, 16, 0.28);
}

.course-status-ribbon-foil {
  color: #1a1610;
  text-shadow: 0 1px 1px rgba(255, 244, 214, 0.55);
  background: linear-gradient(180deg, #f3e2b0 0%, #d4b56a 52%, #a07c32 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(90, 62, 16, 0.7);
  box-shadow:
    inset 0 1px 1px rgba(255, 255, 255, 0.42),
    0 2px 3px rgba(80, 55, 12, 0.28);
}

.cover-link {
  position: relative;
  display: block;
  text-decoration: none;
  overflow: hidden;
}

.course-new-badge {
  position: absolute;
  z-index: 3;
  top: 8px;
  right: 8px;
  width: 60px;
  height: 60px;
  color: #fff;
  filter: drop-shadow(0 2px 3px rgba(64, 33, 11, 0.34));
  pointer-events: none;
}

.course-new-badge svg {
  display: block;
  width: 100%;
  height: 100%;
}

.course-new-badge path {
  fill: #ff4000;
  stroke: rgba(255, 246, 228, 0.9);
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.course-new-badge text {
  fill: currentColor;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: -0.7px;
  text-anchor: middle;
}

.title-link {
  text-decoration: none;
  color: inherit;
}

.title-link:hover {
  color: lab(78% 17.57 75.74);
}

.course-card:hover h3 {
  color: lab(78% 17.57 75.74);
}

.cover {
  position: relative;
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  background: #f0f0f0;
  overflow: hidden;
}

.cover::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.5) 50%, transparent 70%);
  transform: translateX(-100%);
  pointer-events: none;
  z-index: 1;
}

.course-card:hover .cover::before {
  transform: translateX(100%);
  transition: transform 1.2s cubic-bezier(0.85, 0, 0.15, 1);
}

.cover span {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: clamp(18px, 3.5vw, 32px);
  font-weight: 700;
}

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

.cover-image img.contain {
  object-fit: contain;
}

.cover-1 {
  background-color: #f4c57b;
}

.cover-2 {
  background-color: #f0a660;
}

.cover-3 {
  background-color: #e8cf91;
}

.cover-4 {
  background-color: #d99655;
}

.cover-5 {
  background-color: #f5d49a;
}

.cover-0 {
  background-color: #eeb36d;
}

.course-card h3 {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: #000000;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  padding: 10px 12px 0;
}

.course-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0 12px;
}

.course-author {
  color: var(--muted);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-duration {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.course-icons {
  display: flex;
  gap: 6px;
  margin-top: auto;
  padding: 0 12px;
  color: var(--muted);
}

.course-icon-wrap {
  position: relative;
  display: inline-flex;
}

.course-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.course-desc {
  margin: 0px 0 0;
  padding: 0px 0px;
  background: hsl(222, 21%, 43%);
  color: hsl(0, 0%, 100%);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 36px;
  border-radius: 0px;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 5;
  line-clamp: 5;
}

.course-tags {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  margin-top: 4px;
  padding: 0 12px 12px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--muted);
  font-size: 12px;
}

.course-card:not(:has(.course-icons)) .course-tags {
  margin-top: auto;
}

.course-tag {
  color: var(--muted);
  font-size: 12px;
}

.course-tag:hover {
  border-color: var(--line-dark);
  background: var(--accent-soft);
  color: var(--ink);
}

.course-tag-highlight {
  color: #2563eb;
  font-weight: 700;
}

.course-tag-foil {
  color: #8a6b24;
  font-weight: 700;
}

.course-date {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--muted);
  font-size: 12px;
}