.btn {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 18px;
  padding: 0 22px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-align: center;
  white-space: nowrap;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--fei-ink);
  color: #fff;
  box-shadow: 0 8px 18px rgba(26, 29, 43, 0.16);
}

.btn-primary:hover {
  box-shadow: 0 12px 22px rgba(26, 29, 43, 0.22);
}

.btn-secondary {
  border: 1px solid var(--fei-line);
  background: #fff;
  color: var(--fei-ink);
  box-shadow: var(--shadow-soft);
}

.btn-secondary:hover {
  border-color: rgba(103, 232, 249, 0.7);
}

.btn-gradient {
  background: linear-gradient(90deg, var(--fei-lavender) 0%, var(--fei-cyan) 100%);
  color: var(--fei-ink);
  box-shadow: 0 10px 24px rgba(103, 232, 249, 0.22);
}

.btn-gradient:hover {
  box-shadow: 0 14px 28px rgba(103, 232, 249, 0.28);
}

.btn-block {
  width: 100%;
}

.card-hover {
  transition:
    transform var(--transition-mid),
    box-shadow var(--transition-mid),
    border-color var(--transition-mid);
}

.card-hover:hover {
  transform: translateY(-4px);
  border-color: rgba(103, 232, 249, 0.5);
  box-shadow: var(--shadow-hover);
}

.path-card {
  display: flex;
  min-height: 318px;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(176, 227, 239, 0.8);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(250, 253, 255, 0.98), rgba(242, 250, 251, 0.98));
  box-shadow: 0 12px 30px rgba(26, 29, 43, 0.06);
}

.path-card-media {
  aspect-ratio: 16 / 7.3;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(223,245,242,0.86), rgba(199,210,254,0.72));
}

.path-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.path-card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 20px;
}

.path-card-label {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  background: rgba(199, 210, 254, 0.2);
  color: #58709b;
  padding: 5px 9px;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.path-card h3 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.path-card p {
  color: var(--fei-text-mid);
  font-size: 14px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.path-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.path-meta-pill {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-pill);
  background: rgba(223,245,242,0.85);
  color: var(--fei-ink);
  padding: 6px 11px;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.course-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--fei-line);
  border-radius: 28px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.course-card-media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #eef4ff, #f3fffd);
}

.course-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 10px;
  padding: 22px 22px 24px;
}

.course-card-series {
  color: var(--fei-violet);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}

.course-card h3 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.18;
}

.course-card-meta {
  color: var(--fei-text-soft);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
}

.course-card-desc {
  color: var(--fei-text-mid);
  font-size: 15px;
  line-height: 1.7;
}

.course-card-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;
}

.library-card {
  border-radius: 24px;
}

.library-card .course-card-media {
  aspect-ratio: 4 / 3;
}

.library-card .course-card-body {
  padding: 20px 20px 22px;
}

.library-card h3 {
  font-size: 18px;
}

.library-card .course-card-desc {
  font-size: 14px;
  line-height: 1.65;
}

.badge-bubble {
  position: absolute;
  top: 14px;
  right: 14px;
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  overflow: hidden;
  border: 4px solid var(--fei-gold);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
}

.badge-bubble img {
  width: 78%;
  height: 78%;
  object-fit: contain;
}

.badge-fallback {
  font-size: 28px;
}

.reward-strip {
  display: flex;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  border-left: 5px solid var(--fei-cyan);
  border-radius: 16px;
  background: rgba(226, 245, 238, 0.95);
  color: #2d6a4f;
  padding: 0 16px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.meta-pill {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  border: 1px solid var(--fei-line);
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--fei-text-soft);
  padding: 0 12px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
}

.meta-pill-accent {
  border-color: rgba(103,232,249,0.35);
  background: rgba(223,245,242,0.72);
  color: var(--fei-ink);
}

.resource-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.resource-label {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  border: 1px solid var(--fei-line);
  border-radius: var(--radius-pill);
  background: #f8fbff;
  color: var(--fei-text-soft);
  padding: 0 10px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.resource-label-available {
  background: rgba(226,245,238,0.9);
  color: #1d6b50;
}

.inline-link {
  color: var(--fei-violet);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.inline-link:hover {
  color: var(--fei-ink);
}

.card-kicker {
  color: var(--fei-text-soft);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.3px;
  text-transform: uppercase;
}

.visual-fallback {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  background: linear-gradient(135deg, rgba(223,245,242,0.65), rgba(199,210,254,0.55));
  padding: 20px;
  color: var(--fei-text-soft);
  text-align: center;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
}

.mode-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border: 1px solid var(--fei-line);
  border-radius: var(--radius-lg);
  background: #fff;
  padding: 26px;
  box-shadow: var(--shadow-soft);
}

.mode-card h3 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.mode-status {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  background: var(--fei-soft-mint);
  color: var(--fei-success);
  padding: 6px 10px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.mode-status-dark {
  background: var(--fei-ink);
  color: #fff;
}

.philosophy-card {
  border: 1px solid var(--fei-line);
  border-radius: var(--radius-lg);
  background: #fff;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.philosophy-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
  font-weight: 800;
}

.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  background: rgba(15, 23, 42, 0.62);
  padding: 36px 18px;
  backdrop-filter: blur(4px);
}

.detail-panel {
  position: relative;
  width: min(1120px, 100%);
  overflow: hidden;
  border: 1px solid var(--fei-line);
  border-radius: 32px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.22);
}

.detail-close {
  position: absolute;
  top: 18px;
  right: 20px;
  z-index: 2;
  width: 42px;
  height: 42px;
  border: 1px solid var(--fei-line);
  border-radius: 50%;
  background: #fff;
  color: var(--fei-ink);
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  box-shadow: var(--shadow-soft);
}

.detail-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: 340px;
}

.detail-hero-media {
  min-height: 340px;
  background: linear-gradient(135deg, rgba(223,245,242,0.86), rgba(199,210,254,0.72));
}

.detail-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-hero-copy {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-direction: column;
  padding: 48px 40px 40px;
}

.detail-hero-copy h2 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.detail-summary {
  color: var(--fei-text-mid);
  font-size: 17px;
}

.detail-section {
  padding: 34px 36px 40px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 26px;
}

.detail-main,
.detail-side {
  display: grid;
  gap: 22px;
  align-content: start;
}

.detail-block,
.detail-badge-card,
.detail-note-card {
  border: 1px solid var(--fei-line);
  border-radius: 22px;
  background: #fff;
  padding: 22px;
  box-shadow: var(--shadow-soft);
}

.detail-block p,
.detail-note-card p,
.detail-badge-card p {
  color: var(--fei-text-mid);
  font-size: 15px;
  line-height: 1.75;
}

.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.detail-actions-stack {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.detail-ref-list {
  display: grid;
  gap: 14px;
}

.detail-ref-card {
  border: 1px solid var(--fei-line);
  border-radius: 18px;
  background: #fafcff;
  padding: 16px;
}

.detail-ref-card h4 {
  margin-bottom: 6px;
  font-size: 18px;
  font-weight: 800;
}

.detail-ref-card p {
  font-size: 14px;
}

.detail-ref-license {
  margin: 8px 0;
  color: var(--fei-success);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.detail-badge-visual {
  display: grid;
  width: 92px;
  height: 92px;
  place-items: center;
  overflow: hidden;
  border: 4px solid var(--fei-gold);
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-soft);
  margin-bottom: 16px;
}

.detail-badge-visual img {
  width: 76%;
  height: 76%;
  object-fit: contain;
}

.detail-badge-fallback {
  font-size: 38px;
}

.detail-badge-card h3 {
  margin-bottom: 10px;
  font-size: 26px;
  font-weight: 800;
}

.detail-muted {
  color: var(--fei-text-soft);
  font-size: 14px;
}

.detail-mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.detail-mode-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--fei-line);
  border-radius: 18px;
  background: #fafcff;
  padding: 18px;
}

.detail-mode-card h4 {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.detail-mode-card p {
  color: var(--fei-text-mid);
  font-size: 14px;
  line-height: 1.65;
}

.detail-related-list {
  display: grid;
  gap: 12px;
}

.detail-related-item {
  width: 100%;
  border: 1px solid var(--fei-line);
  border-radius: 18px;
  background: #fff;
  padding: 16px;
  text-align: left;
  box-shadow: var(--shadow-soft);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.detail-related-item:hover {
  transform: translateY(-2px);
  border-color: rgba(103, 232, 249, 0.5);
  box-shadow: var(--shadow-card);
}

.detail-related-series {
  margin-bottom: 6px;
  color: var(--fei-violet);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

.detail-related-title {
  margin-bottom: 6px;
  color: var(--fei-ink);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.2;
}

.detail-related-meta {
  color: var(--fei-text-soft);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
}

.detail-bullet-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  padding-left: 20px;
}

.detail-bullet-list li {
  color: var(--fei-text-mid);
  font-family: var(--font-body);
  line-height: 1.7;
}

.art-history-hero {
  min-height: 60vh;
}

.art-history-hero-card {
  max-width: 760px;
  margin: 0 auto;
  border: 1px solid var(--fei-line);
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.94);
  padding: 42px 36px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

@media (max-width: 900px) {
  .detail-hero,
  .detail-grid,
  .detail-mode-grid {
    grid-template-columns: 1fr;
  }

  .detail-hero-copy {
    padding: 30px 24px;
  }

  .detail-section {
    padding: 24px;
  }
}

@media (max-width: 768px) {
  .btn {
    width: 100%;
  }

  .course-card,
  .path-card {
    border-radius: 24px;
  }

  .course-card-body,
  .path-card-body {
    padding: 20px;
  }

  .path-card h3 {
    font-size: 24px;
  }

  .badge-bubble {
    width: 56px;
    height: 56px;
  }
}