/* bootstrap-khach.min.css — SINH TỰ ĐỘNG (M3-PERF 18/10/2026) từ lib/bootstrap/dist/css/bootstrap.min.css (Bootstrap 5.1.0) bằng PurgeCSS 7.0.2,
   chỉ giữ phần 3 trang khách dùng (/, /huong-dan-test, /Account/Login). KHÔNG sửa tay: chạy lại du_lieu_kiem_dinh/perf/gen_bootstrap_khach.mjs.
   Chỉ nạp cho người CHƯA đăng nhập (xem _Layout.cshtml nhánh trangKhach + Account/Login.cshtml); mọi trang khác vẫn dùng bootstrap.min.css đầy đủ. */
/*!
 * Bootstrap v5.1.0 (https://getbootstrap.com/)
 * Copyright 2011-2021 The Bootstrap Authors
 * Copyright 2011-2021 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 */:root{--bs-blue:#0d6efd;--bs-indigo:#6610f2;--bs-purple:#6f42c1;--bs-pink:#d63384;--bs-red:#dc3545;--bs-orange:#fd7e14;--bs-yellow:#ffc107;--bs-green:#198754;--bs-teal:#20c997;--bs-cyan:#0dcaf0;--bs-white:#fff;--bs-gray:#6c757d;--bs-gray-dark:#343a40;--bs-gray-100:#f8f9fa;--bs-gray-200:#e9ecef;--bs-gray-300:#dee2e6;--bs-gray-400:#ced4da;--bs-gray-500:#adb5bd;--bs-gray-600:#6c757d;--bs-gray-700:#495057;--bs-gray-800:#343a40;--bs-gray-900:#212529;--bs-primary:#0d6efd;--bs-secondary:#6c757d;--bs-success:#198754;--bs-info:#0dcaf0;--bs-warning:#ffc107;--bs-danger:#dc3545;--bs-light:#f8f9fa;--bs-dark:#212529;--bs-primary-rgb:13,110,253;--bs-secondary-rgb:108,117,125;--bs-success-rgb:25,135,84;--bs-info-rgb:13,202,240;--bs-warning-rgb:255,193,7;--bs-danger-rgb:220,53,69;--bs-light-rgb:248,249,250;--bs-dark-rgb:33,37,41;--bs-white-rgb:255,255,255;--bs-black-rgb:0,0,0;--bs-body-rgb:33,37,41;--bs-font-sans-serif:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto 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