:root{--bg:#0f172a;--surface:#111827;--panel:#0b1220;--border:#1f2937;--text:#e5e7eb;--muted:#9ca3af;--primary:#3b82f6}
@media (prefers-color-scheme: light){:root{--bg:#fff;--surface:#f8fafc;--panel:#fff;--border:#e5e7eb;--text:#111827;--muted:#6b7280;--primary:#2563eb}}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}
.container{max-width:1100px;margin:0 auto;padding:24px 16px}
.tool-header{text-align:center;margin-bottom:16px}.subtitle{color:var(--muted)}
.tabs{display:flex;gap:8px;margin-bottom:12px}
.tab{padding:10px 14px;border-radius:8px;border:1px solid var(--border);background:var(--panel);color:var(--text);cursor:pointer}
.tab.active{background:var(--primary);border-color:var(--primary);color:#fff}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px}
.tab-pane{display:none}.tab-pane.active{display:block}
.upload{border:2px dashed var(--border);border-radius:10px;padding:20px;text-align:center;cursor:pointer;margin:8px 0}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:8px 0}
.input{padding:10px;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text)}
.btn{padding:10px 14px;border-radius:8px;border:1px solid var(--border);background:var(--panel);color:var(--text);cursor:pointer}
.btn[disabled]{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
#level-val.disabled{opacity:.6}
.list{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.list li{display:flex;align-items:center;justify-content:space-between;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:8px 10px}
.hint{color:var(--muted);text-align:center;margin-top:12px}