:root{--bg: #0f172a;--panel: #1e293b;--accent: #2563eb;--text: #e2e8f0;--muted: #94a3b8;--border: #334155;--ok: #16a34a}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,sans-serif;background:#f1f5f9;color:#0f172a}h1{font-size:22px;margin:0 0 16px}.muted{color:#64748b}.small{font-size:12px}.center{display:flex;align-items:center;justify-content:center;min-height:100vh}.shell{height:100vh;overflow:hidden}.sidebar{position:fixed;top:0;left:0;width:220px;height:100vh;z-index:100;background:var(--bg);color:var(--text);display:flex;flex-direction:column;padding:18px 0;overflow-y:auto;transform:translate(0);transition:transform .2s ease}.shell.collapsed .sidebar{transform:translate(-100%)}.sidebar-top{display:flex;align-items:flex-start;justify-content:space-between}.icon-btn{background:none;border:none;color:var(--muted);font-size:17px;cursor:pointer;width:auto;padding:4px 14px 4px 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