:root{--bg: #f2f3f6;--grid: rgba(20, 23, 37, .07);--panel: #ffffff;--text: #1b1f2a;--muted: #6c7487;--accent: #ffb703;--accent-strong: #ff9e00;--node: #ffffff;--node-border: #cfd5e1;--node-shadow: rgba(16, 18, 27, .18);--link: #b8c1d1;--link-dash: #c8cfdb;--tool-bg: #24282f;--tool-btn: #2e333c;--tool-border: #3a404b;--tool-accent: #5a67ff;--tool-danger: #ff6b6b}body.theme-dark{--bg: #0f1218;--grid: rgba(255, 255, 255, .06);--panel: #151a22;--text: #e6e9f2;--muted: #a3abc0;--accent: #ffb703;--accent-strong: #ff9e00;--node: #1b202b;--node-border: #3a4253;--node-shadow: rgba(8, 10, 14, .4);--link: #9aa5b6;--link-dash: #7f8aa0;--tool-bg: #1a1f28;--tool-btn: #2a313d;--tool-border: #3a4250}*{box-sizing:border-box}body{margin:0;font-family:Space Grotesk,Avenir Next,Segoe UI,sans-serif;color:var(--text);background:var(--bg);height:100vh;overflow:hidden}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--panel);border-bottom:1px solid 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14px;border-radius:999px;font-weight:600;cursor:pointer}.modal-btn.primary{background:#5a67ff;border-color:transparent}.modal-btn.ghost{background:#ffffff14;border-color:#fff3}.modal-btn:disabled{opacity:.5;cursor:not-allowed}.file-list{display:flex;flex-direction:column;gap:8px;max-height:280px;overflow:auto;margin-bottom:16px}.file-item{border:1px solid rgba(255,255,255,.12);background:#ffffff0f;color:#fff;padding:8px 12px;border-radius:10px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-size:.85rem}.file-item:hover{background:#ffffff1f}.file-item span:last-child{color:#fff9;font-size:.75rem}.context-menu{position:fixed;min-width:220px;background:#252a32;color:#e9edf4;border-radius:16px;padding:8px 0;border:1px solid rgba(255,255,255,.08);box-shadow:0 16px 28px #10121b66;opacity:0;pointer-events:none;transform:translateY(6px);transition:opacity .15s ease,transform .15s 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