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172px);border-radius:28px;border:1px solid rgba(148,163,184,.18);background:linear-gradient(180deg,#fff9,#f8fafcf0),repeating-linear-gradient(90deg,rgba(255,255,255,.14) 0,rgba(255,255,255,.14) 1px,transparent 1px,transparent 24px);display:grid;align-content:start;justify-content:start}.diagram-frame{border:1px solid rgba(226,232,240,.95);border-radius:24px;overflow:hidden;background:#fff;box-shadow:0 18px 40px #94a3b829,0 2px 6px #0f172a0d}.diagram-surface{overflow:auto;width:100%;height:100%;padding:28px}.diagram-surface svg{display:block;width:100%;height:auto}.empty-state,.error-state{width:min(720px,100%);margin:64px auto;padding:28px;border-radius:20px;background:#ffffffeb;color:#1f2937;line-height:1.6;border:1px solid rgba(226,232,240,.85)}.error-state{border-left:6px solid #d14343}.error-actions{display:grid;gap:12px;margin-top:16px}.error-hint{margin:0;color:#6b7280;font-size:12px}.preview-note{margin:12px 0 0;color:var(--text-muted);font-size:12px}