:root{--bg: #f4f6f9;--surface: #ffffff;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #1e293b;--muted: #64748b;--primary: #0f766e;--primary-dark: #0d5f58;--accent: #2563eb;--danger: #dc2626;--warning: #d97706;--success: #16a34a;--radius: 10px;--sidebar: 248px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:15px}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit;font-size:15px}.shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar);background:#0f172a;color:#cbd5e1;flex-shrink:0;display:flex;flex-direction:column;position:fixed;height:100vh;overflow-y:auto}.sidebar .brand{padding:20px 22px;font-size:20px;font-weight:700;color:#fff;letter-spacing:-.3px;border-bottom:1px solid #1e293b}.sidebar .brand span{color:var(--primary)}.sidebar nav{padding:12px 10px;flex:1}.sidebar nav 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