:root{--bg:#f5f7fb;--panel:#fff;--text:#172033;--muted:#667085;--border:#e4e7ec;--primary:#1f5eff;--primary-dark:#174bd2;--danger:#c62828;--ok:#16794b;--shadow:0 8px 24px rgba(16,24,40,.06);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans Thai",Arial,sans-serif;color:var(--text)}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-size:14px}a{color:var(--primary);text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh;display:flex}.sidebar{width:250px;background:#111827;color:#fff;position:fixed;inset:0 auto 0 0;padding:20px;display:flex;flex-direction:column;z-index:20}.brand{font-size:20px;font-weight:800;letter-spacing:.04em;margin-bottom:22px}.brand span{display:block;font-weight:500;font-size:11px;color:#9ca3af;letter-spacing:.02em}.sidebar nav{display:flex;flex-direction:column;gap:5px}.sidebar nav a{color:#d1d5db;padding:10px 12px;border-radius:9px}.sidebar nav 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