/* ── Progression chain ──────────────────────────────────────────── */

.progression-chain-wrap {
  overflow-x: auto;
  overflow-y: visible;
  padding: 1.5rem 0.25rem 2rem;
  -webkit-overflow-scrolling: touch;
  position: relative;
}

.progression-chain {
  display: inline-flex;
  align-items: stretch;
  gap: 0;
  min-width: 100%;
}

.progression-chain-step {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
}

.progression-chain-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem 1.25rem;
  min-width: 140px;
  max-width: 190px;
  background: var(--light-gray);
  border: 2px solid transparent;
  border-radius: 12px;
  gap: 0.35rem;
  transition: border-color 0.15s;
}

.progression-chain-card:hover {
  border-color: var(--primary-color-light);
}

.progression-chain-card.is-goal {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color-dark);
}

.progression-chain-card.is-goal:hover {
  border-color: var(--primary-color-dark);
}

.progression-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--medium-gray);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

.progression-chain-card.is-goal .progression-step-num {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

.progression-step-name {
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.3;
}

.progression-step-name a {
  color: inherit;
  text-decoration: none;
}

.progression-step-name a:hover {
  text-decoration: underline;
}

.progression-chain-card.is-goal .progression-step-name a {
  color: #fff;
}

.progression-step-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.8);
}

.progression-step-notes {
  font-size: 0.73rem;
  color: var(--medium-gray);
  line-height: 1.3;
}

.progression-chain-card.is-goal .progression-step-notes {
  color: rgba(255, 255, 255, 0.7);
}

.progression-chain-arrow {
  display: flex;
  align-items: center;
  padding: 0 0.6rem;
  color: var(--medium-gray);
  font-size: 1.1rem;
  flex-shrink: 0;
  user-select: none;
}

/* ── Insert point ─────────────────────────────────────────────── */

.progression-insert-point {
  display: flex;
  align-items: center;
  position: relative;
}

.progression-insert-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 2px dashed var(--medium-gray);
  background: transparent;
  color: var(--medium-gray);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, border-color 0.15s, color 0.15s;
  flex-shrink: 0;
  margin: 0 0.25rem;
}

.progression-chain-wrap:hover .progression-insert-btn {
  opacity: 0.5;
}

.progression-insert-btn:hover {
  opacity: 1 !important;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.progression-insert-form {
  position: fixed;
  z-index: 100;
  background: #fff;
  border: 1px solid var(--border-color, #ddd);
  border-radius: 8px;
  padding: 0.75rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  min-width: 300px;
}

.progression-insert-form.hidden {
  display: none;
}

/* ── Remove button ────────────────────────────────────────────── */

.progression-step-remove {
  font-size: 0.75rem;
  color: var(--medium-gray);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.progression-chain-card:hover .progression-step-remove {
  opacity: 1;
}

.progression-step-remove:hover {
  color: var(--danger-color, #dc3545);
}

/* ── Edge list ──────────────────────────────────────────────────── */

.edge-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.edge-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.9rem;
  background: var(--light-gray);
  border-radius: 8px;
  flex-wrap: wrap;
}

.edge-endpoint {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 260px;
}

.edge-endpoint a {
  color: inherit;
  text-decoration: none;
}

.edge-endpoint a:hover {
  text-decoration: underline;
  color: var(--primary-color);
}

.edge-separator {
  color: var(--medium-gray);
  font-size: 0.9rem;
  flex-shrink: 0;
}

.edge-tags {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  margin-left: auto;
}