/* AI grading panel (grading/panel.js): /question, lesson flashcards and Phản biện thử.
   States always carry an icon or text, never color alone. */
.grader { display: grid; gap: 12px; padding: 18px; border-radius: var(--radius); background: var(--c-surface); border: 1px solid var(--c-border); margin: 12px 0; }
.grader.compact { padding: 16px; }
.gr-label { font-weight: var(--w-semibold); font-size: 14px; }
.gr-ta { width: 100%; resize: vertical; min-height: 104px; line-height: 1.55; }
.grader.compact .gr-ta { min-height: 88px; }
.gr-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.gr-count { font-size: 12.5px; color: var(--c-muted); margin-left: auto; font-variant-numeric: tabular-nums; }
.gr-mic-wrap { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; min-width: 0; }
.gr-mic-i { display: inline-flex; }
.gr-mic.rec { border-color: var(--c-danger); background: var(--c-danger-bg); color: var(--c-danger); box-shadow: none; }
.gr-mic.rec .gr-mic-i { animation: grPulse 1s ease-in-out infinite; }
.gr-interim { font-size: 14px; color: var(--c-muted); font-style: italic; overflow-wrap: anywhere; }
@keyframes grPulse { 50% { opacity: .35; } }
.gr-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.gr-bestline { font-size: 13.5px; color: var(--c-muted); }
.gr-status:empty { display: none; }
.gr-status { display: flex; align-items: center; gap: 8px; font-size: 14.5px; padding: 10px 12px; border-radius: 10px; background: var(--c-surface-2); }
.gr-status.err { background: var(--c-warn-bg); color: var(--c-text); }
.gr-status.err .ic { color: var(--c-warn); }
.gr-result { outline: none; }
.gr-result:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-primary) 25%, transparent); border-radius: 12px; }
.gr-res { display: grid; gap: 18px; padding: 18px; border-radius: 12px; background: var(--c-surface-2); }
.gr-top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.gr-top-t { flex: 1; min-width: 180px; }
.gr-top-t p { margin: 0 0 2px; }
.gr-score strong { font-size: 22px; font-weight: var(--w-semibold); letter-spacing: -.01em; }
.gr-band { font-weight: var(--w-medium); }
.gr-best { font-size: 13.5px; color: var(--c-muted); }
.gr-ring { flex: none; }
.gr-ring-bg { stroke: var(--c-border); }
.gr-ring-fg { transition: stroke-dasharray .5s ease; }
.gr-ring.good .gr-ring-fg { stroke: var(--c-success); }
.gr-ring.ok .gr-ring-fg { stroke: var(--c-energy); }
.gr-ring.low .gr-ring-fg { stroke: var(--c-danger); }
.gr-ring-t { fill: var(--c-text); }
.gr-ring-s { fill: var(--c-muted); }
.reduce-motion .gr-ring-fg, .reduce-motion .gr-mic.rec .gr-mic-i { transition: none; animation: none; }
.gr-h { display: flex; align-items: center; gap: 6px; margin: 0 0 8px; font-size: 14px; font-weight: var(--w-semibold); }
.gr-points, .gr-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.gr-points li { display: flex; gap: 10px; align-items: flex-start; padding: 8px 12px; border-radius: 10px; background: var(--c-surface); border: 1px solid var(--c-border); margin: 0; line-height: 1.5; font-size: 15px; }
.gr-points li.ok { border-color: var(--c-success-line); }
.gr-points li.miss { border-color: var(--c-danger-line); }
.gr-pi { font-weight: 700; width: 1.2em; flex: none; text-align: center; }
.gr-points li.ok .gr-pi { color: var(--c-success); }
.gr-points li.miss .gr-pi { color: var(--c-danger); }
.gr-list li { padding-left: 1.1em; position: relative; margin: 0; line-height: 1.55; font-size: 15px; }
.gr-list li::before { content: ""; position: absolute; left: .2em; top: .7em; width: 5px; height: 5px; border-radius: 50%; background: var(--c-subtle); }
.gr-errors { padding: 12px 14px; border-radius: 10px; background: var(--c-warn-bg); }
.gr-errors .gr-h .ic { color: var(--c-warn); }
.gr-fb { font-size: 15px; line-height: 1.6; }
.gr-fb p:last-child { margin-bottom: 0; }
.gr-improved { border-radius: 10px; background: var(--c-surface); border: 1px solid var(--c-border); padding: 0 14px; }
.gr-improved summary { cursor: pointer; font-weight: var(--w-medium); font-size: 15px; min-height: var(--tap); display: flex; align-items: center; gap: 6px; list-style: none; }
.gr-improved summary::-webkit-details-marker { display: none; }
.gr-sum-chev { transition: transform var(--dur); color: var(--c-muted); }
.gr-improved[open] .gr-sum-chev { transform: rotate(90deg); }
.gr-improved[open] { padding-bottom: 12px; }
.gr-note { margin: 0; font-size: 12.5px; color: var(--c-muted); line-height: 1.5; }
.gr-badge { display: inline-flex; align-items: center; gap: 4px; padding: 1px 8px; border-radius: 6px; font-weight: var(--w-semibold); font-size: 13px; white-space: nowrap; background: var(--c-surface-2); font-variant-numeric: tabular-nums; }
.gr-badge-k { font-size: 10.5px; font-weight: var(--w-semibold); letter-spacing: .04em; color: var(--c-muted); }
.gr-badge.good { background: var(--c-success-bg); color: var(--c-success); }
.gr-badge.ok { background: var(--c-warn-bg); color: var(--c-warn); }
.gr-badge.low { background: var(--c-danger-bg); color: var(--c-danger); }
.gr-badge.good .gr-badge-k, .gr-badge.ok .gr-badge-k, .gr-badge.low .gr-badge-k { color: inherit; opacity: .8; }

/* flashcard + mock defense hooks */
.fc-ai-btn, .def-ai-btn { white-space: normal; text-align: left; }
.fc-ai-hint { margin: 4px 0 0; font-size: 14.5px; color: var(--c-muted); }
.def-ai-btn { margin-bottom: 8px; }
.def-mic { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 8px; }
.def-mic .ex-sub { margin: 0; }
@media (max-width: 480px) {
  .grader { padding: 14px; }
  .gr-actions .btn, .fc-ai-btn, .def-ai-btn { width: 100%; }
  .gr-ta { font-size: 16px; }
  .gr-mic { white-space: normal; }
}

/* Grade from the backup model: shown, not saved as the best score. */
.gr-fallback { margin: 0; padding: 8px 12px; border-radius: 8px; font-size: 13.5px; background: var(--c-warn-bg); color: inherit; }