/* Trang giới thiệu Kho Mastermind (/tools/mastermind/, 14/10/2026): nền tối của Khu Huấn Luyện (QĐ-73), phông chung tại chỗ. */
:root { --nen: #0b0714; --chu: #f6eefc; --chu-mo: #cdbfe0; --chu-nhat: #a99bc0; --nhan: #f58baf; --vien: #ffe2c4; --duong: rgb(255 226 196 / .18);
  --f-hien: 'Bricolage Grotesque', system-ui, sans-serif; --f-doc: 'Be Vietnam Pro', system-ui, sans-serif; color-scheme: dark; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.mm { margin: 0; min-height: 100vh; background: radial-gradient(120% 70% at 50% 0%, #2a1640 0%, #120a1f 55%, var(--nen) 100%) fixed, var(--nen);
  color: var(--chu); font: 400 16px/1.6 var(--f-doc); display: flex; flex-direction: column; }
a { color: inherit; }
.mm-dau { display: flex; align-items: center; justify-content: space-between; padding: max(12px, env(safe-area-inset-top)) 16px 0; max-width: 960px; width: 100%; margin: 0 auto; }
.mm-ve { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 0 14px 0 8px; border-radius: 99px; border: 1px solid var(--duong);
  background: rgb(21 13 34 / .7); text-decoration: none; font: 600 14px/1 var(--f-doc); }
.mm-ve svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.mm-logo { display: inline-grid; place-items: center; width: 44px; height: 44px; }
.mm-chinh { flex: 1; width: 100%; max-width: 680px; margin: 0 auto; padding: 8px 16px 40px; text-align: center; }
.mm-cau { position: relative; width: min(340px, 82vw); aspect-ratio: 1; margin: 0 auto -8px; }
.mm-cau canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.mm-cau b { display: none; }
.mm-cau .nl-hinh { display: none; }
.mm-cau.nl-khong canvas { display: none; }
.mm-cau.nl-khong .nl-hinh, .mm-cau:not(.nl) .nl-hinh { display: block; position: absolute; inset: 14%; background: url("/tools/hanh-tinh/yoga.webp") center / contain no-repeat;
  filter: drop-shadow(0 0 30px rgb(190 150 255 / .55)); }
.mm-nhan { margin: 0; font: 600 12px/1.4 var(--f-hien); letter-spacing: .12em; text-transform: uppercase; color: var(--vien); }
.mm-chinh h1 { margin: 6px 0 14px; font: 800 clamp(34px, 6vw + 12px, 56px)/1.05 var(--f-hien); letter-spacing: -.01em; }
.mm-mo { margin: 0 auto 14px; max-width: 34em; color: var(--chu-mo); }
.mm-mo b { color: var(--chu); }
.mm-ds { list-style: none; margin: 22px 0; padding: 0; display: grid; gap: 10px; text-align: left; }
.mm-ds li { padding: 14px 16px; border-radius: 18px; border: 1px solid var(--duong); background: rgb(21 13 34 / .72); }
.mm-ds b { display: block; font: 700 16px/1.35 var(--f-hien); color: var(--chu); }
.mm-ds span { display: block; margin-top: 2px; font-size: 14.5px; color: var(--chu-mo); }
@media (min-width: 760px) { .mm-ds { grid-template-columns: repeat(3, 1fr); } }
.mm-nut { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 22px 0 10px; }
.mm-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border-radius: 99px; text-decoration: none;
  font: 700 15.5px/1.2 var(--f-doc); background: var(--nhan); color: #2a0f1a; border: 1px solid var(--nhan); }
.mm-btn.phu { background: transparent; color: var(--chu); border-color: rgb(255 226 196 / .4); }
.mm-btn:focus-visible, .mm-ve:focus-visible, .mm-chan a:focus-visible { outline: 2px solid var(--vien); outline-offset: 3px; }
.mm-ghi { margin: 6px 0 0; font-size: 13.5px; color: var(--chu-nhat); }
.mm-khoa b { color: var(--vien); }
.mm-bao { margin: 14px auto; max-width: 34em; padding: 10px 14px; border-radius: 14px; background: rgb(242 184 128 / .14); color: #f2b880; font-size: 14px; }
.mm-chan { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 18px; padding: 18px 16px max(22px, env(safe-area-inset-bottom)); font-size: 13.5px; color: var(--chu-nhat); }
.mm-chan a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }