.system-core-overlay {
    position: fixed;
    inset: 0;
    z-index: 10040;
    display: none;
    align-items: flex-end;
    justify-content: center;
    background: color-mix(in srgb, var(--bg) 38%, transparent);
    backdrop-filter: blur(8px);
}

.system-core-overlay.active { display: flex; }

.system-core-shell {
    width: min(620px, 100%);
    max-height: min(84vh, 820px);
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 22px 22px 0 0;
    background: var(--bg);
    color: var(--text);
    box-shadow: 0 -20px 70px rgba(0, 0, 0, .24);
}

.system-core-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 22px 14px;
    border-bottom: 1px solid var(--border);
}

.system-core-head h2 { margin: 2px 0 0; font-size: 1.15rem; }
.system-core-kicker { color: var(--accent); font-size: .68rem; letter-spacing: .08em; }
.system-core-close { border: 0; background: transparent; color: var(--text); font-size: 1.7rem; cursor: pointer; }
.system-core-body { max-height: calc(84vh - 76px); overflow: auto; padding: 18px 20px 28px; }

.system-core-summary { display: flex; align-items: baseline; gap: 10px; }
.system-core-summary strong { font-size: 1.55rem; color: var(--accent); }
.system-core-summary span, .system-core-note, .system-core-empty { font-size: .76rem; opacity: .68; }
.system-core-note { margin: 5px 0 20px; line-height: 1.55; }
.system-core-body h3 { margin: 18px 0 9px; font-size: .75rem; letter-spacing: .04em; opacity: .72; }

.system-core-package,
.system-core-connection {
    margin-bottom: 8px;
    border: 1px solid var(--border);
    border-radius: 13px;
    background: var(--card-bg);
}

.system-core-package summary,
.system-core-connection {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 14px;
}

.system-core-package summary { cursor: pointer; list-style: none; }
.system-core-package summary::-webkit-details-marker { display: none; }
.system-core-package-copy { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.system-core-package-copy b, .system-core-connection b { font-size: .85rem; }
.system-core-package-copy small, .system-core-connection small { font-size: .7rem; opacity: .62; }
.system-core-connection > span:first-child { display: flex; flex-direction: column; gap: 3px; }
.system-core-connection.is-offline { opacity: .55; }
.system-core-tools { padding: 0 13px 9px; }

.system-core-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 38px;
    padding: 0 2px;
    border-top: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    font-size: .78rem;
}

.system-core-row.is-disabled { opacity: .45; }
.system-core-row input { width: 18px; height: 18px; accent-color: var(--accent); }

.system-core-switch { position: relative; width: 38px; height: 22px; flex: 0 0 auto; }
.system-core-switch input { position: absolute; opacity: 0; pointer-events: none; }
.system-core-switch span { display: block; width: 100%; height: 100%; border-radius: 20px; background: var(--border); transition: .16s ease; }
.system-core-switch span::after { content: ''; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg); transition: .16s ease; }
.system-core-switch input:checked + span { background: var(--accent); }
.system-core-switch input:checked + span::after { transform: translateX(16px); }
.system-core-switch input:disabled + span { opacity: .45; }
.system-core-empty { padding: 18px 10px; text-align: center; line-height: 1.6; }

@media (min-width: 700px) {
    .system-core-overlay { align-items: center; }
    .system-core-shell { border-radius: 22px; }
}