/* ── Source Combo (zsc) ────────────────────────────────────
   Reusable RAG-source dropdown with accordion, search,
   and per-collection package checkboxes.

   Usage:
     <div id="my-src-combo"></div>
     new ZSourceCombo(document.getElementById('my-src-combo'), { ... });

   CSS prefix: zsc-  (zummit source combo)
   ──────────────────────────────────────────────────────── */

/* ── Trigger Button ─────────────────────────────────────── */
.zsc-wrap { position: relative; }

.zsc-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.75rem;
    border: 1px solid var(--z-border);
    border-radius: 0.5rem;
    background: var(--z-bg-input);
    color: var(--z-text-mid);
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
    white-space: nowrap;
    height: 38px;
}
.zsc-btn:hover { border-color: var(--z-border-focus); }
.zsc-btn.open {
    border-color: var(--z-primary);
    box-shadow: var(--z-focus-ring);
}

/* Badge (selected count) */
.zsc-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 700;
    background: var(--z-primary);
    color: #fff;
}
.zsc-badge.empty {
    background: var(--z-bg-subtle);
    color: var(--z-text-faint);
    border: 1px solid var(--z-border);
}

/* Chevron */
.zsc-chevron {
    transition: transform 0.2s;
}
.zsc-btn.open .zsc-chevron {
    transform: rotate(180deg);
}

/* ── Dropdown Panel ─────────────────────────────────────── */
.zsc-panel {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    z-index: 50;
    min-width: 320px;
    max-width: 420px;
    max-height: 60vh;
    overflow-y: auto;
    background: var(--z-bg-card);
    border: 1px solid var(--z-border);
    border-radius: 0.5rem;
    box-shadow: var(--z-shadow-panel);
}
.zsc-panel.open { display: block; }

/* Search input inside panel */
.zsc-search-wrap {
    position: sticky;
    top: 0;
    z-index: 1;
    padding: 0.5rem;
    background: var(--z-bg-card);
    border-bottom: 1px solid var(--z-border);
}
.zsc-search-inner {
    position: relative;
    display: flex;
    align-items: center;
}
.zsc-search {
    width: 100%;
    padding: 0.4rem 1.75rem 0.4rem 0.6rem;
    border: 1px solid var(--z-border);
    border-radius: 0.375rem;
    font-size: 0.78rem;
    outline: none;
    background: var(--z-bg-input, #fff);
}
.zsc-search:focus {
    border-color: var(--z-primary);
    box-shadow: var(--z-focus-ring);
}
.zsc-search-clear {
    position: absolute;
    right: 0.35rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: none;
    background: var(--z-bg-subtle);
    border-radius: 50%;
    cursor: pointer;
    color: var(--z-text-faint);
    font-size: 0.7rem;
    line-height: 1;
    padding: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s, color 0.15s;
}
.zsc-search-inner.has-value .zsc-search-clear {
    opacity: 1;
    pointer-events: auto;
}
.zsc-search-clear:hover {
    color: var(--z-text);
    background: var(--z-border);
}

/* ── Collection Group ───────────────────────────────────── */
.zsc-coll-group { border-bottom: 1px solid var(--z-border); }
.zsc-coll-group:last-child { border-bottom: none; }

.zsc-coll-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    user-select: none;
    transition: background 0.1s;
    background: var(--z-bg-subtle);
}
.zsc-coll-header:hover { background: var(--z-bg-hover); }

.zsc-coll-name {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--z-text-mid);
}

.zsc-coll-badge {
    font-size: 0.6rem;
    background: var(--z-primary);
    color: #fff;
    padding: 0.1rem 0.4rem;
    border-radius: 9999px;
    min-width: 16px;
    text-align: center;
}
.zsc-coll-badge.empty {
    background: var(--z-bg-subtle);
    color: var(--z-text-faint);
    border: 1px solid var(--z-border);
}

.zsc-coll-chevron {
    transition: transform 0.2s;
    color: var(--z-text-faint);
}
.zsc-coll-group.open .zsc-coll-chevron { transform: rotate(90deg); }

.zsc-coll-body { display: none; padding: 0.15rem 0; }
.zsc-coll-group.open .zsc-coll-body { display: block; }

/* ── Package Checkbox Row ───────────────────────────────── */
.zsc-pkg-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem 0.35rem 1.25rem;
    cursor: pointer;
    transition: background 0.1s;
    font-size: 0.78rem;
    color: var(--z-text-mid);
}
.zsc-pkg-row:hover { background: var(--z-bg-hover); }

.zsc-pkg-cb {
    width: 15px; height: 15px;
    accent-color: var(--z-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.zsc-pkg-label {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.zsc-pkg-count {
    font-size: 0.65rem;
    color: var(--z-text-faint);
    flex-shrink: 0;
}

/* ── Empty/Error States ─────────────────────────────────── */
.zsc-empty {
    padding: 1.5rem;
    text-align: center;
    color: var(--z-text-faint);
    font-size: 0.8rem;
}