:root{--c-bg: #0f172a;--c-surface: #1e293b;--c-surface-2: #273549;--c-border: #334155;--c-border-2: #475569;--c-text: #e2e8f0;--c-text-2: #94a3b8;--c-text-3: #64748b;--c-text-4: #475569;--c-accent: #6366f1;--c-grad-bg: radial-gradient(ellipse at 50% 0%, #1e1b4b 0%, #0f172a 70%);--c-root-node: linear-gradient(135deg, #1e1b4b 0%, #1e293b 100%);--c-shadow: rgba(0, 0, 0, .5)}[data-theme=light]{--c-bg: #f1f5f9;--c-surface: #ffffff;--c-surface-2: #f8fafc;--c-border: #e2e8f0;--c-border-2: #cbd5e1;--c-text: #1e293b;--c-text-2: #475569;--c-text-3: #64748b;--c-text-4: #94a3b8;--c-accent: #6366f1;--c-grad-bg: radial-gradient(ellipse at 50% 0%, #e0e7ff 0%, #f1f5f9 70%);--c-root-node: linear-gradient(135deg, #e0e7ff 0%, #ffffff 100%);--c-shadow: rgba(0, 0, 0, .12)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans KR,sans-serif;background:var(--c-bg);color:var(--c-text);height:100vh;overflow:hidden;transition:background 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var(--c-border);flex-shrink:0;z-index:10}.header-left{display:flex;align-items:center;gap:10px}.header-logo{font-size:1.4rem}.mindmap-header h1{font-size:1.1rem;font-weight:700;color:var(--c-text)}.save-status{font-size:12px;padding:3px 8px;border-radius:6px}.save-status.saved{color:#4ade80;background:#4ade801a}.save-status.saving{color:#fbbf24;background:#fbbf241a}.save-status.error{color:#f87171;background:#f871711a}.header-right{display:flex;align-items:center;gap:12px}.user-info{font-size:13px;color:var(--c-text-3);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;cursor:pointer;padding:4px 6px;border-radius:6px;transition:background .15s}.user-info:hover{background:var(--c-surface-2);color:var(--c-text)}.user-name-input{font-size:13px;color:var(--c-text);background:var(--c-surface-2);border:1px solid var(--c-accent);border-radius:6px;padding:4px 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