:root{--navy: #16324f;--navy-deep: #0f2438;--navy-soft: #1e4468;--accent: #2f7fd1;--accent-soft: #e8f1fb;--ink: #1d2733;--muted: #6b7a8c;--line: #dfe6ee;--bg: #f2f5f9;--panel: #ffffff;--ok: #1f9d63;--warn: #d98324;--danger: #cf3b3b;--radius: 10px;--shadow: 0 1px 3px rgba(16,36,56,.09), 0 6px 20px rgba(16,36,56,.06);--header-h: 58px;--footer-h: 56px;--side-w: 264px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.5 Segoe UI,system-ui,-apple-system,Noto Sans Bengali,sans-serif}.shell{display:flex;flex-direction:column;height:100vh}.header{height:var(--header-h);flex:0 0 var(--header-h);background:linear-gradient(100deg,var(--navy-deep),var(--navy-soft));color:#fff;display:flex;align-items:center;gap:14px;padding:0 16px;box-shadow:0 2px 10px #0f243838;position:relative;z-index:30}.brand{display:flex;align-items:center;gap:10px;background:none;border:0;color:inherit;cursor:pointer;padding:6px 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