/* Trò chơi "Xếp mốc lịch sử AI" (dong-thoi-gian-ai.html, dong-thoi-gian-ai.js): dòng thời gian 6 năm + thẻ mốc, vòng 2 khung chatbot */
.dt { max-width: 1080px; margin: 0 auto; padding: 20px 16px 56px; }
.dt-tien { margin: 0 0 6px; font: 700 13px/1.4 var(--f-mono); letter-spacing: .04em; text-transform: uppercase; color: var(--blue-chu); }
.dt-san { display: grid; gap: 22px; }
.dt-lead { margin: 0; max-width: 720px; font-size: 16.5px; line-height: 1.55; }

/* Dòng thời gian: máy tính 6 cột nằm ngang, điện thoại xếp dọc */
.dt-truc { list-style: none; margin: 0; padding: 0; position: relative; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 12px; }
.dt-truc::before { content: ""; position: absolute; left: 0; right: 0; top: 22px; height: 4px; border-radius: 4px; background: var(--grad); }
.dt-o { position: relative; display: grid; gap: 10px; align-content: start; }
.dt-nam { position: relative; display: grid; gap: 10px; justify-items: center; width: 100%; padding: 0; border: 0; background: none; color: var(--ink); font: inherit; cursor: pointer; text-align: center; }
.dt-nam:disabled { cursor: default; }
.dt-nam-so { padding: 6px 14px; border-radius: 999px; background: var(--panel); border: 2px solid var(--edge); font: 800 16px/1.3 var(--f-mono); }
.dt-cho { display: grid; place-items: center; width: 100%; min-height: 92px; padding: 10px; border-radius: 16px; border: 2px dashed var(--edge); background: color-mix(in srgb, var(--panel) 55%, transparent); font: 700 14px/1.35 var(--f-display); transition: border-color .15s, background .15s, transform .15s; }
.dt-nam.is-cho .dt-cho { border-color: var(--blue); background: color-mix(in srgb, var(--blue) 8%, var(--panel)); }
.dt-nam.is-cho:hover .dt-cho { transform: translateY(-2px); }
.dt-nam.is-co .dt-cho { border-style: solid; border-color: var(--mau, var(--blue)); background: var(--panel); box-shadow: inset 0 5px 0 var(--mau, var(--blue)); }
.dt-nam.is-co .dt-nam-so, .dt-nam.is-dung .dt-nam-so { border-color: var(--mau, var(--blue)); }
.dt-nam.is-dung .dt-cho { border: 2px solid #10B981; box-shadow: inset 0 5px 0 var(--mau); background: var(--panel); }
.dt-nam.is-sai .dt-cho { border: 2px solid #EF4444; box-shadow: inset 0 5px 0 var(--mau); background: color-mix(in srgb, #EF4444 7%, var(--panel)); }
.dt-giai { display: grid; gap: 4px; padding: 0 2px; font-size: 13.5px; line-height: 1.45; animation: dt-hien .35s ease-out; }
.dt-giai p { margin: 0; }
.dt-phan { justify-self: start; padding: 1px 8px; border-radius: 999px; background: var(--bg2); color: var(--blue-chu); font: 700 11.5px/1.6 var(--f-mono); }
.dt-nham { color: #DC2626; font-weight: 700; }
:root[data-theme="dark"] .dt-nham { color: #F87171; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .dt-nham { color: #F87171; } }

/* Kho thẻ chưa xếp */
.dt-kho { padding: 18px; border-radius: 22px; background: var(--panel); border: 2px solid var(--edge); }
.dt-kho.is-het { display: none; }
.dt-kho-h { margin: 0 0 12px; font: 700 12.5px/1.3 var(--f-mono); letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.dt-the-ds { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.dt-the { display: grid; gap: 4px; padding: 12px 14px 12px 16px; border-radius: 14px; border: 2px solid var(--edge); border-left: 6px solid var(--mau); background: var(--bg); color: var(--ink); font: inherit; text-align: left; cursor: pointer; transition: transform .15s, border-color .15s, box-shadow .15s; }
.dt-the b { font: 800 15px/1.35 var(--f-display); }
.dt-the span { font-size: 13px; line-height: 1.4; color: var(--muted); }
.dt-the:hover { transform: translateY(-2px); }
.dt-the.is-cam { border-color: var(--blue); border-left-color: var(--mau); box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 30%, transparent); transform: translateY(-3px); }
.dt-cam { margin: 12px 0 0; min-height: 1.5em; font-weight: 600; color: var(--blue-chu); }
.dt-cta { margin-top: 0; align-items: center; }
.dt-cta .ld-phan-hoi { flex: 1 1 100%; }

/* Vòng 2: khung chat */
.dt-chat { max-width: 720px; display: grid; gap: 14px; padding: 18px; border-radius: 24px; background: var(--panel); border: 2px solid var(--edge); box-shadow: 0 24px 48px -30px rgba(15, 23, 42, .6); }
.dt-hoi { justify-self: end; max-width: 88%; margin: 0; padding: 10px 14px; border-radius: 18px 18px 4px 18px; background: var(--blue); color: #fff; line-height: 1.45; }
.dt-hoi-ai { display: block; font: 700 11px/1.4 var(--f-mono); text-transform: uppercase; opacity: .85; }
.dt-tl { display: grid; gap: 10px; }
.dt-tl-dau { display: flex; align-items: center; gap: 8px; margin: 0; }
.dt-av { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: var(--grad); color: #fff; font: 800 12px/1 var(--f-mono); }
.dt-dong-ds { list-style: none; margin: 0; padding: 0 0 0 14px; display: grid; gap: 8px; border-left: 3px solid var(--edge); }
.dt-dong { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 4px 12px; align-items: center; width: 100%; padding: 10px 12px; border-radius: 14px; border: 2px solid transparent; background: var(--bg); color: var(--ink); font: inherit; text-align: left; cursor: pointer; transition: border-color .15s; }
.dt-dong:hover:not(:disabled) { border-color: var(--edge); }
.dt-dong-nam { font: 800 17px/1.2 var(--f-mono); }
.dt-dong-ten { font-weight: 600; line-height: 1.4; }
.dt-dong.is-khoanh { border-color: #EF4444; border-radius: 999px; box-shadow: 0 0 0 3px color-mix(in srgb, #EF4444 22%, transparent); }
.dt-dong.is-khoanh .dt-dong-nam { color: #DC2626; }
.dt-dong.is-dung { border-color: #10B981; border-radius: 14px; box-shadow: none; }
.dt-dong.is-sai { border-color: #F59E0B; border-radius: 14px; box-shadow: none; }
.dt-dong-giai { grid-column: 1 / -1; display: grid; gap: 2px; font-size: 13.5px; line-height: 1.45; animation: dt-hien .35s ease-out; }
.dt-dong-giai b { font-size: 13px; }

/* Kết quả */
.dt-rut-ds { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.dt-rut { display: grid; gap: 6px; padding: 16px; border-radius: 18px; background: var(--panel); border: 1.5px solid var(--edge); }
.dt-rut p { margin: 0; font-size: 14px; line-height: 1.5; color: var(--muted); }
.dt-so { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--grad); color: #fff; font: 800 14px/1 var(--f-mono); }
.dt-ket .ld-vid small { font-size: 12.5px; }
@keyframes dt-hien { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .dt-giai, .dt-dong-giai { animation: none; } }

@media (max-width: 760px) {
  .dt-truc { grid-template-columns: minmax(0, 1fr); gap: 10px; padding-left: 14px; }
  .dt-truc::before { left: 0; right: auto; top: 6px; bottom: 6px; width: 4px; height: auto; }
  .dt-o { grid-template-columns: minmax(0, 1fr); }
  .dt-nam { grid-template-columns: 74px minmax(0, 1fr); align-items: center; justify-items: stretch; text-align: left; }
  .dt-nam-so { justify-self: start; padding: 5px 10px; font-size: 14.5px; }
  .dt-cho { min-height: 56px; place-items: center start; }
  .dt-giai { padding-left: 84px; }
}
html.nhung .dt { padding-top: 8px; }