/* Nút tab bị khóa tạm thời (ví dụ "Chấm bài AI" khi chưa nối AI thật) */
.tab-btn-locked {
  opacity: .55;
  cursor: not-allowed;
}
.tab-btn-locked:hover {
  opacity: .7;
}

/* ===== Tab "Chấm bài AI" ===== */
.gr-shell { display: flex; flex-direction: column; gap: 18px; }

.gr-topbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px;
  padding: 12px 16px; background: var(--bg-card, #fff);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.gr-seg-group { display: flex; align-items: center; gap: 8px; }
.gr-seg-lbl { font-size: 13px; color: var(--text-muted); font-weight: 600; }
.gr-select {
  padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg-card, #fff); color: var(--text-primary); font-size: 14px;
}

.gr-badge-soon {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600; color: var(--text-warning, #92650a);
  background: var(--bg-warning, #fdf2d0); border: 1px solid var(--border-warning, #e7cf6b);
  border-radius: 999px; padding: 4px 10px;
}

.gr-grid { display: grid; grid-template-columns: 380px 1fr; gap: 18px; align-items: start; }
@media (max-width: 980px) { .gr-grid { grid-template-columns: 1fr; } }

.gr-panel {
  background: var(--bg-card, #fff); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.gr-panel h3 { margin: 0 0 12px; font-size: 15px; color: var(--primary); }

.gr-field { margin-bottom: 14px; }
.gr-field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: var(--text-secondary); }
.gr-field textarea, .gr-field input[type="text"], .gr-field input[type="number"] {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg-card, #fff); color: var(--text-primary); font-size: 14px; font-family: inherit;
  box-sizing: border-box;
}
.gr-field textarea { min-height: 90px; resize: vertical; }
.gr-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.gr-rubric-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: flex-start; }
.gr-rubric-row textarea { flex: 1; min-height: 44px; }
.gr-rubric-row input[type="number"] { width: 76px; flex-shrink: 0; }
.gr-rubric-row .gr-rm { flex-shrink: 0; }

.gr-dropzone {
  border: 2px dashed var(--border-strong); border-radius: var(--radius);
  padding: 28px 16px; text-align: center; color: var(--text-muted);
  cursor: pointer; transition: border-color .15s, background .15s;
}
.gr-dropzone:hover, .gr-dropzone.dragover {
  border-color: var(--primary); background: var(--bg-accent, #eef6f4);
}
.gr-dropzone .gr-dz-icon { font-size: 28px; display: block; margin-bottom: 6px; }
.gr-dropzone-small { padding: 16px 12px; }
.gr-dropzone-small .gr-dz-icon { font-size: 20px; margin-bottom: 3px; }
.gr-dropzone-small b { font-size: 13px; }

.gr-thumbs { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.gr-thumb { position: relative; width: 84px; height: 84px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.gr-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gr-thumb .gr-thumb-rm {
  position: absolute; top: 2px; right: 2px; width: 20px; height: 20px; border-radius: 50%;
  background: rgba(0,0,0,.6); color: #fff; border: none; cursor: pointer; font-size: 12px; line-height: 1;
}
.gr-thumb .gr-thumb-name {
  position: absolute; bottom: 0; left: 0; right: 0; background: rgba(0,0,0,.55); color: #fff;
  font-size: 10px; padding: 2px 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.gr-thumb-doc {
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-accent, #eef6f4);
}

.gr-result-card {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; margin-bottom: 12px;
  background: var(--bg-card, #fff);
}
.gr-result-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 8px; }
.gr-result-score { font-size: 20px; font-weight: 800; color: var(--primary); }
.gr-result-comment { font-size: 13.5px; line-height: 1.55; color: var(--text-secondary); white-space: pre-wrap; }
.gr-result-status { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; }
.gr-result-status.pending { background: var(--bg-warning, #fdf2d0); color: var(--text-warning, #92650a); }
.gr-result-status.done { background: var(--bg-success, #e3f3dc); color: var(--text-success, #1f6d2f); }
.gr-result-status.error { background: var(--bg-danger, #fde6e3); color: var(--text-danger, #a3261a); }

.gr-empty { text-align: center; color: var(--text-muted); padding: 40px 10px; }