/* chrome.css - left rail (filter pills, collections accordion, storage, settings btn) + center strip head. Part of the split-up style.css; see index.html for load order. */
  /* ── LEFT RAIL (desktop): filter · collections · storage · settings ── */
  .left-rail {
    background: linear-gradient(180deg, var(--arc-ink), var(--arc-void));
    border-right: 1px solid var(--arc-rule);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 1.1rem 0.85rem 0.85rem;
    min-height: 0;
  }
  .rail-section { display: flex; flex-direction: column; flex-shrink: 0; }
  .rail-section + .rail-section { margin-top: 1.1rem; }
  .rail-collections { flex: 1; min-height: 0; }

  .rail-label {
    font-family: var(--arc-display);
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--arc-faint);
    margin-bottom: 0.5rem;
  }
  .rail-label-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    gap: 0.4rem;
  }
  .rail-label-row .rail-label { margin-bottom: 0; }
  .rail-label-actions { display: flex; align-items: baseline; gap: 0.6rem; }
  .rail-newcol-btn, .rail-select-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--arc-display);
    font-size: 0.6rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: 0;
  }
  .rail-newcol-btn { color: var(--arc-gold); }
  .rail-select-btn { color: var(--arc-muted); }
  .rail-select-btn:hover, .rail-newcol-btn:hover { color: var(--arc-gold-hi); }
  .rail-select-btn.active { color: var(--arc-gold-hi); }

  /* Filter pills */
  .rail-filter {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    background: var(--arc-ink-soft);
    border: 1px solid var(--arc-hairline);
    border-radius: var(--arc-r-surface);
    padding: 3px;
  }
  .rail-filter .type-filter-btn {
    padding: 0.4rem 0;
    text-align: center;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 2px;
    color: var(--arc-muted);
    font-family: var(--arc-display);
    font-size: 0.56rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    cursor: pointer;
  }
  .rail-filter .type-filter-btn.active {
    background: var(--arc-ink-raised);
    border-color: rgba(216,178,102,0.25);
    color: var(--arc-gold-hi);
    font-weight: 600;
  }
  .rail-filter .type-filter-btn.type-filter-disabled {
    opacity: 0.45;
    cursor: not-allowed;
  }

  /* Collections accordion */
  .rail-collection-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    min-height: 0;
    flex: 1;
    scrollbar-width: thin;
  }
  .rail-expand-all {
    flex-shrink: 0;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--arc-rule-soft);
    cursor: pointer;
    color: var(--arc-muted);
    font-family: var(--arc-display);
    font-size: 0.6rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: 0.4rem 0.55rem 0.5rem;
    margin-bottom: 2px;
  }
  .rail-expand-all:hover { color: var(--arc-gold-hi); }

  .rail-collection { display: flex; flex-direction: column; flex-shrink: 0; }
  .rail-collection-head {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.55rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--arc-r-surface);
    cursor: pointer;
    text-align: left;
    color: var(--arc-gold);
    font-family: var(--arc-display);
    font-size: small;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 600;
  }
  .rail-collection-head:hover { background: rgba(180,130,60,0.06); }
  /* Active collection: same gold-uppercase text as every head, set apart only by
     the highlighted background bar + a brighter gold. */
  .rail-collection.active-collection > .rail-collection-head {
    background: var(--arc-ink-raised);
    border-color: rgba(216,178,102,0.25);
    color: var(--arc-gold-hi);
  }
  .rail-caret {
    color: var(--arc-faint);
    font-size: 0.6rem;
    width: 0.7rem;
    flex-shrink: 0;
    transition: transform 0.15s ease;
  }
  .rail-collection.expanded > .rail-collection-head .rail-caret { color: var(--arc-gold); }
  .rail-col-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .rail-col-count {
    font-family: var(--arc-mono);
    font-size: 0.62rem;
    color: var(--arc-faint);
    flex-shrink: 0;
  }
  .rail-collection.active-collection > .rail-collection-head .rail-col-count { color: var(--arc-gold); }

  /* Nested card list: clamp ~10 rows, scroll within */
  .rail-collection-cards {
    display: none;
    flex-direction: column;
    gap: 1px;
    max-height: 440px; /* ~10 card rows, then scroll within */
    overflow-y: auto;
    margin: 1px 0 3px 0.35rem;
    padding-left: 0.35rem;
    border-left: 1px solid var(--arc-rule-soft);
    scrollbar-width: thin;
  }
  .rail-collection.expanded > .rail-collection-cards { display: flex; }
  .rail-collection-cards .history-empty {
    display: flex;
    padding: 0.4rem 0.5rem;
    font-size: small;
  }

  /* Card rows inside the rail (reuses .history-item builder) */
  .rail-collection-cards .history-item {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.45rem;
    border: 1px solid transparent;
    border-radius: var(--arc-r-surface);
    cursor: pointer;
    width: 100%;
    min-width: 0;
  }
  .rail-collection-cards .history-item:hover { background: rgba(180,130,60,0.06); }
  .rail-collection-cards .history-item.history-active {
    background: var(--arc-ink-raised);
    border-color: rgba(216,178,102,0.3);
  }
  .rail-collection-cards .history-meta { flex: 1; min-width: 0; display: flex; flex-direction: column; }
  .rail-collection-cards .history-name {
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    color: var(--arc-parchment); font-size: small;
  }
  .rail-collection-cards .history-item.history-active .history-name { color: var(--arc-gold-hi); }
  .rail-collection-cards .history-rarity { font-size: small; }
  .rail-collection-cards .history-thumb { flex-shrink: 0; }
  .rail-collection-cards .history-delete {
    flex-shrink: 0; background: none; border: none; cursor: pointer;
    color: var(--arc-faint); font-size: 0.7rem; padding: 0 0.2rem;
  }
  .rail-collection-cards .history-delete:hover { color: var(--arc-danger); }

  /* Selection mode inside the rail: the checkbox takes over the delete-X's spot
     on the right, so the card name never slides left/right. */
  .rail-collection-cards .history-check { order: 10; margin-left: auto; }
  .rail-collection-list.selection-mode .history-check { display: inline-block; }
  .rail-collection-list.selection-mode .history-delete { display: none; }
  .rail-collection-list.selection-mode .history-item.selected .history-check {
    background: var(--arc-gold);
    border-color: var(--arc-gold);
  }
  .rail-collection-list.selection-mode .history-item.selected {
    box-shadow: inset 0 0 0 1.5px var(--arc-gold);
    background: rgba(180,130,60,0.14);
  }

  /* Storage block */
  .rail-storage { margin-top: 0.9rem; border-top: 1px solid var(--arc-rule-soft); padding-top: 0.85rem; }
  .rail-storage-line {
    font-family: 'Crimson Pro', serif;
    font-style: italic;
    font-size: small;
    color: var(--arc-muted);
    margin-bottom: 0.4rem;
  }
  .rail-storage-bar {
    height: 4px;
    background: var(--arc-hairline);
    border-radius: var(--arc-r-pill);
    overflow: hidden;
  }
  .rail-storage-fill {
    height: 100%;
    width: 0%;
    background: var(--arc-gold);
    box-shadow: 0 0 6px var(--arc-gold);
  }
  .rail-storage-backend {
    font-family: var(--arc-mono);
    font-size: 0.56rem;
    letter-spacing: 0.08em;
    color: var(--arc-faint);
    margin-top: 0.35rem;
  }
  .rail-settings-btn {
    margin-top: 0.85rem;
    width: 100%;
    padding: 0.5rem;
    background: var(--arc-ink-soft);
    border: 1px solid var(--arc-hairline);
    border-radius: var(--arc-r-surface);
    color: var(--arc-muted);
    font-family: var(--arc-display);
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
  }
  .rail-settings-btn:hover { color: var(--arc-gold-hi); border-color: rgba(216,178,102,0.3); }

  /* ── CENTER STRIP HEAD (＋ New Card · active card name) ── */
  .card-strip-head {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    flex-shrink: 0;
    padding: 0.55rem 0.9rem;
    border-bottom: 1px solid var(--arc-rule);
    background: var(--arc-ink);
  }
  .card-strip-new {
    flex-shrink: 0;
    height: 30px;
    padding: 0 0.75rem;
    border: none;
    border-radius: var(--arc-r-surface);
    background: linear-gradient(180deg, var(--arc-gold), var(--arc-gold-mid));
    color: var(--arc-ink);
    font-family: var(--arc-display);
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-weight: 700;
    cursor: pointer;
    box-shadow: inset 0 1px 0 var(--arc-gold-hi);
    white-space: nowrap;
  }
  .card-strip-dup {
    flex-shrink: 0;
    height: 30px;
    width: 32px;
    border: 1px solid var(--arc-hairline);
    border-radius: var(--arc-r-surface);
    background: var(--arc-ink-soft);
    color: var(--arc-muted);
    cursor: pointer;
  }
  .card-strip-dup:hover { color: var(--arc-gold-hi); border-color: rgba(216,178,102,0.3); }
  .card-strip-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--arc-display);
    font-size: medium;
    letter-spacing: 0.06em;
    color: var(--arc-gold-hi);
  }