/* ── Diagram Layout ── */
.diagram {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin: 1.5rem 0;
}

.phase-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin: 1.75rem 0 0.75rem;
}

h2.phase-label:first-of-type { margin-top: 0; }

/* ── Nodes ── */
.node {
    padding: 1rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.node h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.node .role {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
    font-style: italic;
}

.node .addr {
    font-family: 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin: 0.15rem 0;
    word-break: break-all;
}

.node .addr span {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-top: 0.6rem;
}

.tag {
    font-size: 0.68rem;
    font-family: 'Courier New', monospace;
    padding: 0.15rem 0.45rem;
    border-radius: 3px;
    background: var(--toggle-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* ── Node Colour Variants ── */
.node.client   { border-left: 3px solid var(--text-muted); }
.node.fortiadc { border-left: 3px solid var(--accent); }
.node.nginx    { border-left: 3px solid #10b981; }
[data-theme="dark"] .node.nginx { border-left-color: #34d399; }

/* ── Connectors ── */
.connector {
    display: flex;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0 0 0 1.5rem;
    min-height: 3rem;
}

.connector .track {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 2px;
    flex-shrink: 0;
}

.connector .track .line {
    flex: 1;
    width: 2px;
    background: var(--border);
}

.connector .track .arrowhead {
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 7px solid var(--border);
}

.connector .track.up .arrowhead {
    border-top: none;
    border-bottom: 7px solid var(--border);
    order: -1;
}

.connector .labels {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.4rem 0;
    min-width: 0;
}

.connector .conn-label {
    font-size: 0.78rem;
    font-family: 'Courier New', monospace;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-wrap: wrap;
    word-break: break-word;
}

.connector .conn-label .dir {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-style: italic;
    font-family: 'Georgia', serif;
}

/* ── Bidirectional connector ── */
.connector.bidir {
    gap: 0;
}

.connector.bidir .track-pair {
    display: flex;
    gap: 3px;
    width: 8px;
    flex-shrink: 0;
}

.connector.bidir .track-pair .line {
    flex: 1;
    width: 2px;
    background: var(--border);
}

.connector.bidir .labels {
    padding-left: 0.75rem;
}