/* =========================================================
   pages/bulk-add-students.css
   ---------------------------------------------------------
   Bulk student entry / preview / completion.
   Teacher-side visual language:
   black primary actions, restrained teal, compact cards.
   ========================================================= */

.nn-bulk-students {
  display: grid;
  gap: 16px;
  max-width: 1320px;
  margin: 0 auto;
}

.nn-bulk-students *,
.nn-bulk-students *::before,
.nn-bulk-students *::after {
  box-sizing: border-box;
}

.nn-bulk-students__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.nn-bulk-students__head h1 {
  margin: 0;
  color: #0f172a;
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.nn-bulk-students__head p {
  margin: 7px 0 0;
  color: #64748b;
  font-size: 0.92rem;
}

.nn-bulk-students__head code {
  padding: 2px 5px;
  border-radius: 5px;
  background: #f1f5f9;
  color: #334155;
  font-size: 0.85em;
}

.nn-bulk-back,
.nn-bulk-secondary {
  border-color: #d4dce4 !important;
  background: #fff !important;
  color: #334155 !important;
}

.nn-bulk-back:hover,
.nn-bulk-secondary:hover,
.nn-bulk-back:focus-visible,
.nn-bulk-secondary:focus-visible {
  border-color: #aeb9c5 !important;
  background: #f8fafc !important;
  color: #0f172a !important;
}

.nn-bulk-primary {
  border-color: #101820 !important;
  background: #101820 !important;
  color: #fff !important;
}

.nn-bulk-primary:hover,
.nn-bulk-primary:focus-visible {
  border-color: #26313b !important;
  background: #26313b !important;
  color: #fff !important;
}


/* =========================================================
   COMPACT DEFAULTS BAR
   ========================================================= */

.nn-bulk-defaults {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(190px, 240px) minmax(0, 1fr);
  align-items: center;
  gap: 22px;
  padding: 15px 18px;
}

.nn-bulk-defaults label {
  display: grid;
  gap: 6px;
}

.nn-bulk-defaults__label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #334155;
  font-size: 0.74rem;
  font-weight: 800;
}

.nn-bulk-defaults__label i {
  color: #0f9fa8;
}

.nn-bulk-defaults p {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  margin: 0;
  color: #64748b;
  font-size: 0.74rem;
  line-height: 1.45;
}

.nn-bulk-defaults p i {
  margin-top: 2px;
  color: #0f9fa8;
}

.nn-bulk-defaults select,
.nn-bulk-table input,
.nn-bulk-table select,
.nn-bulk-paste textarea {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background-color: #fff;
  color: #0f172a;
  font: inherit;
}

.nn-bulk-defaults select,
.nn-bulk-table select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, #64748b 50%),
    linear-gradient(135deg, #64748b 50%, transparent 50%);
  background-position:
    calc(100% - 14px) 50%,
    calc(100% - 10px) 50%;
  background-size: 4px 4px, 4px 4px;
  background-repeat: no-repeat;
  padding-right: 28px;
}

.nn-bulk-defaults select,
.nn-bulk-table input,
.nn-bulk-table select {
  min-height: 38px;
  padding-left: 9px;
  font-size: 0.82rem;
}

.nn-bulk-defaults select:focus,
.nn-bulk-table input:focus,
.nn-bulk-table select:focus,
.nn-bulk-paste textarea:focus {
  outline: 2px solid rgba(15, 159, 168, 0.12);
  border-color: #0f9fa8;
}


/* =========================================================
   STUDENT GRID CARD
   ========================================================= */

.nn-bulk-grid-card,
.nn-bulk-preview {
  overflow: hidden;
  padding: 0;
}

.nn-bulk-grid-card__head,
.nn-bulk-preview__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid #e2e8f0;
}

.nn-bulk-grid-card__head h2,
.nn-bulk-preview__head h2,
.nn-bulk-result__messages h2,
.nn-bulk-complete h2 {
  margin: 0;
  color: #0f172a;
  font-size: 1rem;
  font-weight: 850;
}

.nn-bulk-grid-card__head p,
.nn-bulk-preview__head p,
.nn-bulk-complete p {
  margin: 4px 0 0;
  color: #64748b;
  font-size: 0.8rem;
  line-height: 1.4;
}


/* =========================================================
   COLLAPSIBLE PASTE UTILITY
   ========================================================= */

.nn-bulk-paste-card {
  margin: 14px 18px 0;
  overflow: hidden;
  border: 1px solid #dbe4ea;
  border-radius: 10px;
  background: #fbfcfd;
}

.nn-bulk-paste-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 46px;
  padding: 0 14px;
  cursor: pointer;
  list-style: none;
  color: #334155;
  font-size: 0.8rem;
  font-weight: 800;
}

.nn-bulk-paste-card summary::-webkit-details-marker {
  display: none;
}

.nn-bulk-paste-card summary::marker {
  content: "";
}

.nn-bulk-paste-card summary > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nn-bulk-paste-card summary > span i {
  color: #0f9fa8;
}

.nn-bulk-paste-card summary > i {
  color: #94a3b8;
  font-size: 0.68rem;
  transition: transform 0.18s ease;
}

.nn-bulk-paste-card[open] summary > i {
  transform: rotate(180deg);
}

.nn-bulk-paste {
  padding: 14px;
  border-top: 1px solid #e2e8f0;
}

.nn-bulk-paste label {
  display: grid;
  gap: 6px;
  color: #334155;
  font-size: 0.74rem;
  font-weight: 800;
}

.nn-bulk-paste textarea {
  min-height: 120px;
  padding: 10px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.78rem;
}

.nn-bulk-paste p {
  margin: 7px 0 12px;
  color: #64748b;
  font-size: 0.72rem;
}


/* =========================================================
   TABLE
   ========================================================= */

.nn-bulk-table-wrap {
  margin: 14px 18px 0;
  overflow-x: auto;
  border: 1px solid #e2e8f0;
  border-radius: 9px;
  -webkit-overflow-scrolling: touch;
}

.nn-bulk-table {
  width: 100%;
  min-width: 920px;
  border-collapse: collapse;
  table-layout: fixed;
}

.nn-bulk-table th,
.nn-bulk-table td {
  padding: 6px 7px;
  border-bottom: 1px solid #edf0f3;
  vertical-align: middle;
  text-align: left;
}

.nn-bulk-table tr:last-child td {
  border-bottom: 0;
}

.nn-bulk-table tbody tr:hover {
  background: #fbfcfd;
}

.nn-bulk-table th {
  background: #f8fafc;
  color: #64748b;
  font-size: 0.68rem;
  font-weight: 850;
}

.nn-bulk-table th small {
  color: #94a3b8;
  font-size: 0.63rem;
  font-weight: 600;
}

.nn-bulk-table th:nth-child(1),
.nn-bulk-table th:nth-child(2) {
  width: 16%;
}

.nn-bulk-table th:nth-child(3) {
  width: 23%;
}

.nn-bulk-table th:nth-child(4) {
  width: 20%;
}

.nn-bulk-table th:nth-child(5),
.nn-bulk-table th:nth-child(6) {
  width: 10%;
}

.nn-bulk-table th:last-child {
  width: 42px;
}

.nn-bulk-table input,
.nn-bulk-table select {
  min-width: 0;
  min-height: 34px;
  font-size: 0.78rem;
}

.nn-bulk-table__remove {
  text-align: center !important;
}

.nn-bulk-remove-row {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 29px;
  height: 29px;
  padding: 0;
  border: 1px solid #d8dee5;
  border-radius: 7px;
  background: #fff;
  color: #64748b;
  cursor: pointer;
}

.nn-bulk-remove-row:hover {
  border-color: #fecaca;
  background: #fff5f5;
  color: #b42318;
}


/* =========================================================
   GRID FOOTER
   ========================================================= */

.nn-bulk-grid-card__foot,
.nn-bulk-preview__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px 18px;
}

.nn-bulk-grid-card__foot {
  margin-top: 6px;
}

.nn-bulk-add-row {
  border: 1px dashed #0f9fa8 !important;
  background: #fff !important;
  color: #087780 !important;
}

.nn-bulk-add-row:hover,
.nn-bulk-add-row:focus-visible {
  background: #f1fbfb !important;
}


/* =========================================================
   TIP
   ========================================================= */

.nn-bulk-tip {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 12px 14px;
  border: 1px solid #d7e9ed;
  border-radius: 9px;
  background: #f7fbfc;
  color: #64748b;
  font-size: 0.74rem;
}

.nn-bulk-tip i {
  margin-top: 2px;
  color: #0f9fa8;
}


/* =========================================================
   PREVIEW SUMMARY STATS
   ========================================================= */

.nn-bulk-result {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.nn-bulk-result__stat {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid #dce3e9;
  border-radius: 10px;
  background: #fff;
}

.nn-bulk-result__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #64748b;
}

.nn-bulk-result__stat > div {
  display: grid;
  gap: 1px;
}

.nn-bulk-result__stat strong {
  color: #0f172a;
  font-size: 1.25rem;
  font-weight: 850;
  line-height: 1;
}

.nn-bulk-result__stat span {
  color: #64748b;
  font-size: 0.72rem;
}

.nn-bulk-result__stat.is-success {
  border-color: #cfe8d8;
  background: #f7fcf8;
}

.nn-bulk-result__stat.is-success .nn-bulk-result__icon {
  background: #dff4e6;
  color: #16845f;
}

.nn-bulk-result__stat.is-warning {
  border-color: #f1dfb8;
  background: #fffaf0;
}

.nn-bulk-result__stat.is-warning .nn-bulk-result__icon {
  background: #fff0c7;
  color: #a66b00;
}

.nn-bulk-result__stat.is-error {
  border-color: #f2cccc;
  background: #fff8f8;
}

.nn-bulk-result__stat.is-error .nn-bulk-result__icon {
  background: #ffe5e5;
  color: #c2413b;
}


/* =========================================================
   REVIEW CARDS
   ========================================================= */

.nn-bulk-preview__list {
  display: grid;
  gap: 10px;
  padding: 16px 18px 4px;
}

.nn-bulk-preview-card {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid #dce3e9;
  border-radius: 10px;
  background: #fff;
}

.nn-bulk-preview-card.is-valid {
  border-left: 3px solid #2aaa66;
}

.nn-bulk-preview-card.is-invalid {
  border-left: 3px solid #d54f49;
}

.nn-bulk-preview-card__status {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  color: #16845f;
}

.nn-bulk-preview-card.is-invalid .nn-bulk-preview-card__status {
  color: #c2413b;
}

.nn-bulk-preview-card__status i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: #dff4e6;
}

.nn-bulk-preview-card.is-invalid .nn-bulk-preview-card__status i {
  background: #ffe5e5;
}

.nn-bulk-preview-card__main {
  display: grid;
  gap: 7px;
  padding: 13px 15px;
}

.nn-bulk-preview-card__main h3 {
  margin: 0;
  color: #0f172a;
  font-size: 0.9rem;
  font-weight: 850;
}

.nn-bulk-preview-card__meta,
.nn-bulk-preview-card__details {
  display: flex;
  align-items: center;
  gap: 8px 14px;
  flex-wrap: wrap;
}

.nn-bulk-preview-card__meta {
  color: #64748b;
  font-size: 0.74rem;
}

.nn-bulk-preview-card__meta span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nn-bulk-preview-card__meta i {
  color: #0f9fa8;
}

.nn-bulk-preview-card__details {
  color: #475569;
  font-size: 0.72rem;
}

.nn-bulk-ready {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  background: #e8f6ee;
  color: #166534;
  font-weight: 800;
}

.nn-bulk-message {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  margin: 0;
  font-size: 0.72rem;
}

.nn-bulk-message.is-warning {
  color: #946000;
}

.nn-bulk-message.is-error {
  color: #b42318;
}

.nn-bulk-preview__foot {
  margin-top: 10px;
  border-top: 1px solid #edf0f3;
  background: #fafbfc;
}


/* =========================================================
   COMPLETION
   ========================================================= */

.nn-bulk-complete {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 18px;
}

.nn-bulk-complete__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 999px;
  background: #dff4e6;
  color: #16845f;
  font-size: 1.05rem;
}

.nn-bulk-complete__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nn-bulk-result__messages {
  padding: 16px 18px;
}

.nn-bulk-result__messages p {
  margin: 5px 0;
  color: #64748b;
  font-size: 0.76rem;
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 900px) {
  .nn-bulk-defaults {
    grid-template-columns: 1fr 1fr;
  }

  .nn-bulk-defaults p {
    grid-column: 1 / -1;
  }

  .nn-bulk-complete {
    grid-template-columns: 50px minmax(0, 1fr);
  }

  .nn-bulk-complete__actions {
    grid-column: 1 / -1;
  }
}

@media (max-width: 700px) {
  .nn-bulk-students__head,
  .nn-bulk-grid-card__head,
  .nn-bulk-preview__head {
    align-items: stretch;
    flex-direction: column;
  }

  .nn-bulk-defaults {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 14px;
  }

  .nn-bulk-defaults p {
    grid-column: auto;
  }

  .nn-bulk-table-wrap {
    margin: 12px 12px 0;
    overflow: visible;
    border: 0;
  }

  .nn-bulk-table {
    min-width: 0;
    table-layout: auto;
  }

  .nn-bulk-table thead {
    display: none;
  }

  .nn-bulk-table,
  .nn-bulk-table tbody,
  .nn-bulk-table tr,
  .nn-bulk-table td {
    display: block;
    width: 100%;
  }

  .nn-bulk-table tr {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 9px 10px;
    margin-bottom: 10px;
    padding: 13px 42px 13px 14px;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    background: #fff;
  }

  .nn-bulk-table td {
    padding: 0;
    border: 0;
  }

  .nn-bulk-table td::before {
    display: block;
    margin-bottom: 4px;
    color: #64748b;
    content: attr(data-label);
    font-size: 0.67rem;
    font-weight: 800;
  }

  .nn-bulk-table td:nth-child(3),
  .nn-bulk-table td:nth-child(4) {
    grid-column: 1 / -1;
  }

  .nn-bulk-table__remove {
    position: absolute;
    top: 10px;
    right: 8px;
    width: auto !important;
  }

  .nn-bulk-table__remove::before {
    display: none !important;
  }

  .nn-bulk-grid-card__foot,
  .nn-bulk-preview__foot {
    align-items: stretch;
    flex-direction: column;
  }

  .nn-bulk-grid-card__foot .btn,
  .nn-bulk-preview__foot .btn,
  .nn-bulk-preview__foot form,
  .nn-bulk-preview__foot form .btn {
    width: 100%;
  }

  .nn-bulk-result {
    grid-template-columns: 1fr;
  }

  .nn-bulk-complete {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .nn-bulk-complete__actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .nn-bulk-complete__actions .btn {
    width: 100%;
  }

  .nn-bulk-preview-card {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .nn-bulk-paste-card {
    margin: 12px 12px 0;
  }
}

@media (max-width: 420px) {
  .nn-bulk-table tr {
    grid-template-columns: 1fr;
  }

  .nn-bulk-table td:nth-child(3),
  .nn-bulk-table td:nth-child(4) {
    grid-column: auto;
  }
}