/* ========================================================
   2026-2 대학한국어2 - Teacher Admin Styles
   Modern, Clean, Academic & Professional LMS Dashboard
   ======================================================== */

.admin-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 0;
  margin-bottom: 1.5rem;
}

.admin-header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.admin-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.admin-badge {
  font-size: 0.72rem;
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #FDE68A;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  font-weight: 700;
  letter-spacing: 0.03em;
}

/* Nav Bar (Segmented Control Style) */
.admin-nav-bar {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  background: #F1F5F9;
  border: 1px solid var(--border);
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  flex-wrap: wrap;
}

.admin-nav-item {
  background: transparent;
  border: none;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.admin-nav-item:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.6);
}

.admin-nav-item.active {
  background: var(--surface);
  color: var(--primary);
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* Admin Toolbar */
.admin-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 1rem;
}

.admin-toolbar-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.admin-lesson-selector {
  padding: 0.45rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-strong);
  background: white;
  min-width: 240px;
  color: var(--text-main);
}

/* Table Card */
.admin-table-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xs);
  overflow-x: auto;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.admin-table th, .admin-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
  vertical-align: middle;
}

.admin-table th {
  background: #F8FAFC;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.admin-table tbody tr:hover {
  background: #F8FAFC;
}

/* Backup Grid */
.backup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.tool-card {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.tool-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.tool-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

/* Submissions Section */
.submissions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 1rem;
}

.submission-card {
  background: var(--surface);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.submission-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.65rem;
  margin-bottom: 0.85rem;
}

.student-name-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.15rem;
}

.submission-sentences-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.sub-sent-row {
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-xs);
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.sub-sent-num {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  white-space: nowrap;
}

.sub-sent-text {
  font-size: 0.88rem;
  color: var(--text-main);
  font-weight: 500;
}

.sub-sent-body {
  flex: 1;
  min-width: 0;
}

.submissions-sync-note {
  background: #FFFBEB;
  border: 1px solid #FCD34D;
  color: #92400E;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.85rem;
  cursor: pointer;
}

.submissions-sync-note:hover {
  background: #FEF3C7;
}

.sub-sent-row.has-correction {
  border-color: var(--primary-border);
  background: #FCFDFF;
}

/* ---- 문장 첨삭 입력 에디터 ---- */
.corr-done-badge {
  display: inline-block;
  margin-left: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: #1D4ED8;
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
  padding: 0.05rem 0.4rem;
  border-radius: 3px;
  vertical-align: middle;
}

.corr-editor {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-strong);
}

.corr-editor-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.corr-textarea {
  font-size: 0.88rem;
  min-height: 44px;
  margin-bottom: 0.4rem;
}

.corr-comment {
  font-size: 0.82rem;
  padding: 0.4rem 0.6rem;
  margin-bottom: 0.4rem;
}

.corr-preview {
  display: none;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.45rem 0.6rem;
  margin-bottom: 0.45rem;
  font-size: 0.85rem;
  line-height: 1.55;
}

.corr-preview-line {
  display: flex;
  gap: 0.4rem;
  align-items: baseline;
}

.corr-preview-line + .corr-preview-line {
  margin-top: 0.2rem;
}

.corr-tag {
  flex-shrink: 0;
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--text-muted);
  background: #E2E8F0;
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
}

.corr-tag-fix {
  color: #fff;
  background: var(--primary);
}

.corr-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.4rem;
}

/* ========================================================
   교사 과제 확인 평가 (O, △, X) 스타일
   ======================================================== */
.grade-action-group {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--surface-subtle);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.grade-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-right: 0.2rem;
}

.btn-grade {
  border: 1px solid var(--border);
  background: white;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-grade-o {
  color: #059669;
  border-color: #A7F3D0;
}

.btn-grade-o:hover,
.btn-grade-o.active {
  background: #059669;
  color: white;
  border-color: #059669;
  box-shadow: 0 1px 4px rgba(5, 150, 105, 0.3);
}

.btn-grade-tri {
  color: #D97706;
  border-color: #FDE68A;
}

.btn-grade-tri:hover,
.btn-grade-tri.active {
  background: #D97706;
  color: white;
  border-color: #D97706;
  box-shadow: 0 1px 4px rgba(217, 119, 6, 0.3);
}

.btn-grade-x {
  color: #DC2626;
  border-color: #FECACA;
}

.btn-grade-x:hover,
.btn-grade-x.active {
  background: #DC2626;
  color: white;
  border-color: #DC2626;
  box-shadow: 0 1px 4px rgba(220, 38, 38, 0.3);
}

.btn-grade-clear {
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 0.2rem 0.4rem;
}

/* 매트릭스 테이블 내 평가 뱃지 */
.matrix-cell-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.eval-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.55rem;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.1s ease;
  user-select: none;
}

.eval-badge:hover {
  transform: scale(1.05);
}

.eval-badge-o {
  background: #ECFDF5;
  color: #059669;
  border: 1.5px solid #10B981;
}

.eval-badge-tri {
  background: #FFFBEB;
  color: #D97706;
  border: 1.5px solid #F59E0B;
}

.eval-badge-x {
  background: #FEF2F2;
  color: #DC2626;
  border: 1.5px solid #EF4444;
}

.eval-badge-pending {
  background: #EFF6FF;
  color: #2563EB;
  border: 1px solid #BFDBFE;
}

.eval-badge-none {
  background: #F8FAFC;
  color: #94A3B8;
  border: 1px dashed #CBD5E1;
}

/* Admin Mobile Responsive */
@media (max-width: 768px) {
  .admin-header .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }

  .admin-header .d-flex {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .admin-nav-bar {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding-bottom: 0.35rem;
  }

  .admin-nav-item {
    white-space: nowrap;
    flex-shrink: 0;
  }

  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ========================================================
   다국어 (Multilingual) 관리자 입력 및 테이블 스타일
   ======================================================== */
.admin-lang-inputs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 6px;
  padding: 0.75rem;
}

@media (max-width: 540px) {
  .admin-lang-inputs-grid {
    grid-template-columns: 1fr;
  }
  .admin-lang-inputs-grid .admin-lang-input-item[style*="span 2"] {
    grid-column: span 1 !important;
  }
}

.admin-lang-input-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.admin-lang-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: #475569;
}

.admin-multi-lang-cell {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.82rem;
  max-width: 320px;
}

.admin-lang-row {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  line-height: 1.35;
}

.admin-lang-row-label {
  flex-shrink: 0;
  font-weight: 700;
  color: #64748B;
  font-size: 0.72rem;
  min-width: 55px;
}

.admin-lang-row-val {
  color: #0F172A;
  font-weight: 600;
  word-break: keep-all;
}