/* ===== Case Card ===== */
.case-card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-card), box-shadow var(--transition-card);
  background: var(--color-bg-secondary);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.case-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ===== Card Cover (gradient block) ===== */
.case-card__cover {
  position: relative;
  height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-md);
  overflow: hidden;
}

/* Giant initial letter watermark */
.case-card__initial {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  font-size: 200px;
  font-weight: 700;
  color: rgba(255, 255, 255, 1);
  opacity: 0.3;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  letter-spacing: -4px;
}

/* Card name wrapper */
.case-card__name-wrap {
  position: relative;
  z-index: 1;
}

.case-card__name-zh {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.3;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.case-card__name {
  font-size: 14px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.3;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  margin-top: 4px;
}

/* ===== Expanded Details ===== */
.case-card__details {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-expand);
  background: var(--color-bg);
}

.case-card.is-expanded .case-card__details {
  max-height: 1200px;
}

.case-card__details-inner {
  padding: var(--space-md);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-fast) 0.15s,
              transform var(--transition-fast) 0.15s;
}

.case-card.is-expanded .case-card__details-inner {
  opacity: 1;
  transform: translateY(0);
}

/* Detail content */
.case-card__description {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.case-card__description--zh {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.case-card__description--en {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

/* Section label */
.case-card__section-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.case-card__section-label-en {
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-tertiary);
  margin-left: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Tool tags */
.case-card__tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-md);
}

.case-card__tool-tag {
  font-size: 13px;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px 12px;
}

/* Links area */
.case-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-md);
}

.case-card__link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-btn);
  padding: 6px 16px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.case-card__link:hover {
  background: var(--color-accent);
  color: #FFFFFF;
}

.case-card__link--primary {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #FFFFFF;
  background: var(--color-accent);
  border: none;
  border-radius: 20px;
  transition: background 0.2s, transform 0.2s;
}

.case-card__link--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* Collapse button */
.case-card__collapse-btn {
  display: block;
  width: 100%;
  padding: 10px;
  font-size: 14px;
  color: var(--color-text-tertiary);
  text-align: center;
  border-top: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.case-card__collapse-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

/* Hidden cards (for "show more") */
.case-card.is-hidden-card {
  display: none;
}

.case-card.is-hidden-card.is-visible {
  display: block;
}