.tang-main { padding: 36px 0 80px; }

.register-title {
  margin: 0 0 16px;
  color: var(--signal-secondary);
  font-size: var(--type-key);
  font-weight: 650;
  letter-spacing: -0.01em;
}

.tang-book {
  overflow: clip;
  border: 1px solid var(--wire);
  border-radius: 12px;
  background: var(--terminal-raised);
}

.register-columns,
.tang-position summary {
  display: grid;
  grid-template-columns: minmax(240px, 1.3fr) minmax(190px, 1fr) minmax(170px, 0.8fr) 132px;
  align-items: center;
  gap: 16px;
}

.register-columns {
  position: sticky;
  z-index: 10;
  top: 73px;
  min-height: 36px;
  border-bottom: 1px solid var(--wire);
  background: var(--terminal-raised);
  color: var(--signal-muted);
  padding: 0 20px;
  font: 700 var(--type-meta)/1 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  letter-spacing: 0.09em;
}

.tang-position { border-bottom: 1px solid var(--wire-soft); }
.tang-position:last-child { border-bottom: 0; }

.tang-position summary {
  min-height: 76px;
  padding: 14px 20px;
  cursor: pointer;
  list-style: none;
  transition: background-color 150ms ease-out;
}

.tang-position summary::-webkit-details-marker { display: none; }
.tang-position summary:hover { background: var(--wire-soft); }
.tang-position summary:focus-visible { outline: 2px solid var(--wire-focus); outline-offset: -2px; }

.position-identity,
.position-state,
.latest-operation { min-width: 0; }

.position-identity > span,
.position-state > strong,
.latest-operation > time { display: block; }

.identity-line {
  display: flex;
  align-items: center;
  gap: 8px;
}

.identity-line strong {
  color: var(--signal-ink);
  font: 700 var(--type-key)/1 "Ubuntu Mono", "Nimbus Mono PS", monospace;
}

.identity-line small {
  border: 1px solid var(--wire);
  border-radius: 4px;
  color: var(--signal-tertiary);
  padding: 3px 5px;
  font: 700 var(--type-meta)/1 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  letter-spacing: 0.08em;
}

.position-identity > span:last-child {
  overflow: hidden;
  margin-top: 7px;
  color: var(--signal-tertiary);
  font-size: var(--type-meta);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.position-state > strong {
  overflow: hidden;
  color: var(--signal-secondary);
  font-size: var(--type-body);
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cost-note {
  width: max-content;
  display: block;
  margin-top: 7px;
  color: var(--profit);
  font: 500 var(--type-meta)/1.2 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  text-decoration: none;
}

.cost-note b { color: var(--signal-ink); font-weight: 650; font-variant-numeric: tabular-nums; }
.cost-note:hover { text-decoration: underline; text-underline-offset: 3px; }

.action-label,
.history-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--signal-secondary);
  font-size: var(--type-body);
  font-weight: 600;
}

.action-label i,
.history-action i {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: currentColor;
}

.action-open,
.action-add { color: var(--profit); }
.action-reduce { color: var(--caution); }
.action-close { color: var(--risk); }

.latest-operation > time {
  overflow: hidden;
  margin-top: 7px;
  color: var(--signal-muted);
  font: 500 var(--type-meta)/1.2 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.trail-toggle {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  color: var(--signal-tertiary);
  font-size: var(--type-meta);
  font-weight: 650;
  white-space: nowrap;
  transform-origin: right center;
  transition: color 150ms ease-out, transform 120ms ease-out;
}

.tang-position summary:hover .trail-toggle { color: var(--signal-ink); }
.tang-position summary:active .trail-toggle { transform: scale(0.97); }
.trail-toggle-hide { display: none; }
.tang-position[open] .trail-toggle-show { display: none; }
.tang-position[open] .trail-toggle-hide { display: inline; }

.expand-mark {
  position: relative;
  width: 32px;
  height: 44px;
  justify-self: end;
}

.expand-mark::before,
.expand-mark::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1px;
  content: "";
  background: var(--signal-tertiary);
  transform: translate(-50%, -50%);
  transition: transform 150ms ease-out;
}

.expand-mark::after { transform: translate(-50%, -50%) rotate(90deg); }
.tang-position[open] .expand-mark::after { transform: translate(-50%, -50%) rotate(0); }

.position-history {
  border-top: 1px solid var(--wire-soft);
  background: var(--tape-inset);
  padding: 24px 32px 28px;
}

.position-history h2 {
  margin: 0 0 12px;
  color: var(--signal-tertiary);
  font: 700 var(--type-meta)/1 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  letter-spacing: 0.1em;
}

.position-history ol { margin: 0; padding: 0; list-style: none; }

.position-history li {
  min-height: 48px;
  display: grid;
  grid-template-columns: 148px 72px minmax(160px, 1fr) max-content max-content;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--wire-soft);
}

.position-history time {
  color: var(--signal-muted);
  font: 500 var(--type-meta)/1.3 "Ubuntu Mono", "Nimbus Mono PS", monospace;
  font-variant-numeric: tabular-nums;
}

.history-size { color: var(--signal-secondary); font-size: var(--type-meta); }
.history-price { color: var(--signal-ink); font: 600 var(--type-meta)/1 "Ubuntu Mono", "Nimbus Mono PS", monospace; font-variant-numeric: tabular-nums; }

.position-history li > a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--signal-tertiary);
  font-size: var(--type-body);
  text-decoration: none;
}

.position-history li > a:hover { color: var(--profit); }
.history-empty { margin: 0; color: var(--signal-muted); font-size: var(--type-body); }

.tang-empty {
  min-height: 320px;
  display: grid;
  place-content: center;
  justify-items: center;
  border: 1px solid var(--wire);
  border-radius: 12px;
  background: var(--terminal-raised);
  padding: 40px 20px;
  text-align: center;
}

.tang-empty > span { color: var(--signal-muted); font: 500 var(--type-key)/1 "Ubuntu Mono", monospace; }
.tang-empty h2 { margin: 14px 0 0; font-size: var(--type-key); }
.tang-empty p { margin: 8px 0 0; color: var(--signal-tertiary); font-size: var(--type-body); }

@media (max-width: 980px) {
  .register-columns { display: none; }
  .tang-position summary {
    grid-template-columns: minmax(0, 1fr) minmax(150px, 0.8fr) 132px;
    grid-template-areas:
      "identity state toggle"
      "latest latest toggle";
    row-gap: 12px;
  }
  .position-identity { grid-area: identity; }
  .position-state { grid-area: state; }
  .latest-operation { grid-area: latest; }
  .trail-toggle { grid-area: toggle; align-self: center; }
}

@media (max-width: 600px) {
  .tang-main { padding: 28px 0 56px; }
  .register-title { margin-bottom: 12px; font-size: var(--type-key); }
  .tang-position summary {
    min-height: 92px;
    grid-template-columns: minmax(0, 1fr) 132px;
    grid-template-areas:
      "identity toggle"
      "state state"
      "latest latest";
    gap: 10px 8px;
    padding: 16px 14px;
  }
  .position-state { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
  .cost-note { margin-top: 0; }
  .latest-operation { display: flex; align-items: center; gap: 10px; }
  .latest-operation > time { margin-top: 0; }
  .position-history { padding: 20px 14px 24px; }
  .position-history li {
    grid-template-columns: 1fr auto;
    gap: 8px 12px;
    padding: 12px 0;
  }
  .position-history time { grid-column: 1; }
  .history-action { grid-column: 2; grid-row: 1; }
  .history-size { grid-column: 1 / -1; }
  .history-price { grid-column: 1; }
  .position-history li > a { grid-column: 2; grid-row: 3; justify-self: end; }
}

@media (prefers-reduced-motion: reduce) {
  .trail-toggle,
  .expand-mark::before,
  .expand-mark::after { transition-duration: 0.01ms; }
}
.identity-line a {
  color: inherit;
  text-decoration: none;
}

.identity-line a:hover { color: var(--profit); }