/* AI Core v1.4 — AI Tutor trong trang học bài, trang Học cùng AI, quản trị AI. Chỉ giao diện sáng. */

/* ---------- AI Tutor (trang học bài) ---------- */
.tutor { position: fixed; right: 18px; bottom: 18px; z-index: 65; }
.tutor-fab { display: inline-flex; align-items: center; gap: 8px; height: 46px; padding: 0 18px; border-radius: 999px; border: 0; background: var(--tim); color: var(--tim-ink); font: 650 14px var(--font); box-shadow: var(--shadow-2); cursor: pointer; }
.tutor-fab svg { width: 20px; height: 20px; }
.tutor-fab:focus-visible { outline: 3px solid color-mix(in srgb, var(--tim) 40%, transparent); outline-offset: 2px; }
.tutor[data-state="open"] .tutor-fab, .tutor[data-state="wide"] .tutor-fab { display: none; }
.tutor-panel { display: none; flex-direction: column; width: min(400px, calc(100vw - 24px)); height: min(640px, calc(100vh - var(--top-h) - 36px)); background: var(--paper-2); border: 1px solid var(--line-2); border-radius: var(--r-lg); box-shadow: var(--shadow-pop); overflow: hidden; }
.tutor[data-state="open"] .tutor-panel, .tutor[data-state="wide"] .tutor-panel { display: flex; }
.tutor[data-state="wide"] .tutor-panel { width: min(760px, calc(100vw - 36px)); height: calc(100vh - var(--top-h) - 36px); }
.tutor[data-state="wide"] .tutor-wide-btn svg { transform: rotate(180deg); }
.tutor-head { display: flex; align-items: center; gap: 8px; padding: 10px 10px 10px 14px; border-bottom: 1px solid var(--line); background: var(--tim-soft); }
.tutor-title { flex: 1; min-width: 0; display: grid; }
.tutor-title b { font-size: 15px; }
.tutor-ctx { font-size: 12px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tutor-actions { display: flex; gap: 2px; }
.tutor-bar { display: flex; align-items: center; gap: 10px; padding: 8px 12px 0; }
.tutor-level { height: 32px; font-size: 13px; padding: 0 8px; width: auto; flex: none; max-width: 60%; }
.tutor-bar .small { flex: 1; text-align: right; }
.tutor-quick { padding: 8px 12px; gap: 6px; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: thin; }
.tutor-quick .chip { white-space: nowrap; flex: none; }
.tutor-msgs { flex: 1; overflow-y: auto; padding: 8px 12px 12px; display: flex; flex-direction: column; gap: 10px; background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.tutor-empty { margin: auto 0; display: grid; gap: 6px; text-align: center; color: var(--ink-2); font-size: 13px; padding: 18px 8px; }
.tutor-empty b { color: var(--ink); font-size: 14px; }
.tmsg { max-width: 92%; border-radius: 14px; padding: 9px 12px; font-size: 14px; line-height: 1.55; overflow-wrap: anywhere; }
.tmsg.user { align-self: flex-end; background: var(--tim); color: var(--tim-ink); border-bottom-right-radius: 4px; }
.tmsg.assistant { align-self: flex-start; background: var(--paper-2); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.tmsg.error { align-self: stretch; max-width: none; background: var(--do-soft); color: var(--do); border: 1px solid color-mix(in srgb, var(--do) 30%, transparent); }
.tmsg.note { align-self: center; background: var(--cam-soft); color: var(--cam); font-size: 12.5px; }
.tmsg-body > :first-child { margin-top: 0; }
.tmsg-body > :last-child { margin-bottom: 0; }
.tmsg-body pre { max-width: 100%; overflow-x: auto; font-size: 12.5px; }
.tmsg-body h1, .tmsg-body h2, .tmsg-body h3 { font-size: 15px; margin: 8px 0 4px; }
.tmsg-tools { display: flex; justify-content: flex-end; margin-top: 6px; }
.tutor-status { padding: 6px 12px; color: var(--ink-2); display: flex; align-items: center; gap: 8px; }
.tutor-status[hidden] { display: none; }
.tutor-form { padding: 8px 12px 10px; display: grid; gap: 6px; }
.tutor-modes { display: flex; gap: 4px; flex-wrap: wrap; }
.tutor-mode { position: relative; }
.tutor-mode input { position: absolute; opacity: 0; pointer-events: none; }
.tutor-mode span { display: inline-block; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line-2); font-size: 12.5px; cursor: pointer; color: var(--ink-2); }
.tutor-mode input:checked + span { background: var(--tim-soft); border-color: var(--tim); color: var(--tim-2); font-weight: 650; }
.tutor-mode input:focus-visible + span { outline: 2px solid var(--tim); outline-offset: 1px; }
.tutor-input { display: flex; gap: 8px; align-items: flex-end; }
.tutor-input textarea { flex: 1; resize: vertical; min-height: 44px; max-height: 180px; border: 1px solid var(--line-2); border-radius: 12px; padding: 9px 11px; font: 14px/1.45 var(--font); background: var(--paper-2); color: var(--ink); }
.tutor-input textarea:focus { outline: 2px solid color-mix(in srgb, var(--tim) 35%, transparent); border-color: var(--tim); }
.tutor-send { height: 44px; min-width: 44px; }
.tutor-send.tutor-stop { background: var(--do-soft); color: var(--do); border-color: var(--do); }
.tutor-quota { margin: 0; }
@media (max-width: 720px) {
  .tutor { right: 12px; bottom: 12px; }
  .tutor[data-state="open"], .tutor[data-state="wide"] { left: 0; right: 0; bottom: 0; }
  .tutor[data-state="open"] .tutor-panel, .tutor[data-state="wide"] .tutor-panel { width: 100vw; height: min(88vh, calc(100vh - 48px)); border-radius: 18px 18px 0 0; border-bottom: 0; }
  .tutor-wide-btn { display: none; }
  .tmsg { max-width: 100%; }
}
/* Màn hình rộng: khung Tutor nằm cạnh nội dung bài, không che bài */
@media (min-width: 1180px) { body.tutor-open .lc-learn { margin-right: 418px; } }
/* Chừa chỗ để nút Tutor không che nút "Bài tiếp theo" ở cuối bài */
body.in-app .lc-main { padding-bottom: 84px; }

/* ---------- Học cùng AI ---------- */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: 16px; align-items: start; }
.ai-form-grid { display: grid; gap: 12px; }
.ai-form-grid label { display: grid; gap: 4px; font-size: 13px; font-weight: 600; color: var(--ink-2); }
.ai-courses { border: 1px solid var(--line); border-radius: var(--r); padding: 8px 12px; display: grid; gap: 4px; max-height: 220px; overflow-y: auto; }
.ai-courses #courseBox { display: grid; gap: 4px; }
.ai-plan-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.ai-plan-list a { display: grid; gap: 6px; padding: 12px; border: 1px solid var(--line); border-radius: var(--r); color: var(--ink); text-decoration: none; }
.ai-plan-list a:hover { border-color: var(--tim); background: var(--tim-soft); }
.ai-plan-items { list-style: none; margin: 0 0 12px; padding: 0; display: grid; gap: 6px; }
.ai-plan-items li { display: grid; grid-template-columns: 92px minmax(0, 1fr) auto auto; gap: 10px; align-items: center; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--r); background: var(--paper-2); }
.ai-plan-items li.done { background: var(--la-soft); border-color: color-mix(in srgb, var(--la) 25%, transparent); }
.ai-plan-items li.late { border-color: color-mix(in srgb, var(--cam) 50%, transparent); }
.ai-day { display: grid; font-weight: 650; font-size: 13px; }
.ai-day small, .ai-it small { font-weight: 400; color: var(--ink-3); font-size: 12px; }
.ai-it { display: grid; min-width: 0; }
.ai-it a { color: var(--ink); font-weight: 600; overflow-wrap: anywhere; }
.ai-advice { padding: 10px 12px; border-radius: var(--r); background: var(--la-soft); color: var(--la); }
.ai-advice.warn { background: var(--cam-soft); color: var(--cam); }
.ai-mem { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 6px; }
.ai-mem li { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--r); }
.ai-mem li span:nth-child(2) { display: grid; }
.ai-mem small { color: var(--ink-3); }
@media (max-width: 640px) {
  .ai-plan-items li { grid-template-columns: 1fr auto; }
  .ai-plan-items li .ai-day { grid-column: 1 / -1; display: flex; gap: 8px; }
  .ai-plan-items li .btn { grid-column: 1 / -1; justify-self: start; }
}

/* ---------- Quản trị AI ---------- */
.ai-dom-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin: 10px 0; }
.ai-pre { white-space: pre-wrap; max-height: 420px; overflow: auto; font-size: 12.5px; }