:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-soft: #eef3f2;
  --ink: #1d252c;
  --muted: #64717d;
  --line: #d9e0e4;
  --primary: #0f6b62;
  --primary-dark: #0b534d;
  --accent: #b45f06;
  --danger: #b42318;
  --success: #146c43;
  --shadow: 0 10px 30px rgba(28, 37, 44, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  line-height: 1.5;
}

html {
  scroll-behavior: smooth;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px max(24px, calc((100vw - 1180px) / 2));
  background: #17252a;
  color: #fff;
}

.admin-topbar {
  position: sticky;
  top: 0;
  z-index: 15;
  padding-top: 18px;
  padding-bottom: 18px;
  box-shadow: 0 8px 24px rgba(23, 37, 42, 0.16);
}

.topbar-title {
  min-width: 240px;
}

.topbar h1,
.topbar p,
h2,
p {
  margin: 0;
}

.topbar h1 {
  font-size: 28px;
  font-weight: 700;
}

.topbar p {
  margin-top: 4px;
  color: #c8d5d8;
}

.topbar-actions,
.toolbar-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.admin-menu {
  justify-content: flex-end;
}

.menu-link,
.template-menu > summary {
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  padding: 0 12px;
  color: #eef7f6;
  background: rgba(255, 255, 255, 0.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

.menu-link:hover,
.template-menu > summary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.primary-link {
  background: var(--primary);
  border-color: var(--primary);
}

.primary-link:hover {
  background: var(--primary-dark);
}

.logout-link {
  color: #ffe4df;
}

.template-menu {
  position: relative;
}

.template-menu > summary {
  list-style: none;
}

.template-menu > summary::-webkit-details-marker {
  display: none;
}

.template-menu-list {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  display: grid;
  min-width: 168px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.template-menu-list a {
  border-radius: 6px;
  color: var(--ink);
  padding: 9px 10px;
  text-decoration: none;
  white-space: nowrap;
}

.template-menu-list a:hover {
  background: var(--surface-soft);
}

main {
  width: min(1180px, calc(100vw - 32px));
  margin: 24px auto 48px;
}

#ticket-statistics,
#feedback-section {
  scroll-margin-top: 96px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.metric,
.panel,
.result-panel,
.rules-band,
.feedback-section,
.students-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.metric {
  padding: 18px;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 30px;
  line-height: 1;
}

.workbench {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.panel {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 16px;
  padding: 18px;
}

.panel h2,
.rules-band h2,
.students-section h2 {
  font-size: 18px;
}

.panel p,
.students-section p {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.file-picker {
  position: relative;
  display: inline-flex;
  min-width: 168px;
  max-width: 260px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px dashed #9aa8af;
  border-radius: 6px;
  color: #33434c;
  background: #fafbfc;
  cursor: pointer;
  overflow: hidden;
  padding: 0 12px;
}

.file-picker span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-picker input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.button,
button {
  height: 40px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0 14px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  white-space: nowrap;
}

.button.primary,
button.primary {
  background: var(--primary);
  color: #fff;
}

.button.primary:hover,
button.primary:hover {
  background: var(--primary-dark);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.button.secondary:hover {
  background: rgba(255, 255, 255, 0.16);
}

.result-panel {
  margin-top: 16px;
  padding: 18px;
}

.result-panel.hidden {
  display: none;
}

.result-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.result-title strong {
  font-size: 17px;
}

.close-result {
  background: transparent;
  border-color: var(--line);
  width: 34px;
  height: 34px;
  padding: 0;
}

.failure-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 13px;
}

.failure-table th,
.failure-table td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 8px;
}

.failure-table th {
  color: var(--muted);
  font-weight: 600;
}

.feedback-note {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
  font: inherit;
  background: #fff;
}

.feedback-note {
  min-width: 180px;
  resize: vertical;
}

.feedback-handled {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.feedback-actions {
  display: grid;
  gap: 8px;
  min-width: 96px;
}

.feedback-actions button {
  height: 34px;
  border-color: var(--line);
  background: #fff;
  color: var(--primary-dark);
}

.feedback-actions button:disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: #f2f4f5;
}

.feedback-toolbar-controls {
  justify-content: flex-end;
}

.student-toolbar-controls {
  justify-content: flex-end;
}

.feedback-batch-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fafbfc;
}

.feedback-batch-actions span {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.feedback-batch-actions button {
  height: 30px;
  padding: 0 9px;
  border-color: var(--line);
  background: #fff;
  color: var(--primary-dark);
  font-size: 13px;
}

.feedback-batch-actions button:disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: #f2f4f5;
}

.student-export-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fafbfc;
}

.student-export-actions span {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.student-export-actions button,
.student-export-one {
  height: 30px;
  padding: 0 9px;
  border-color: var(--line);
  background: #fff;
  color: var(--primary-dark);
  font-size: 13px;
}

.student-export-actions button:disabled,
.student-export-one:disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: #f2f4f5;
}

#grade-select {
  height: 30px;
  min-width: 104px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 8px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  font-size: 13px;
}

.rules-band {
  margin-top: 16px;
  padding: 18px;
}

.rules-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.rule-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  min-height: 48px;
}

.rule-item span:first-child {
  color: #34454d;
  font-size: 13px;
}

.rule-item strong {
  color: var(--accent);
  white-space: nowrap;
}

.students-section {
  margin-top: 16px;
  overflow: hidden;
}

.feedback-section {
  margin-top: 16px;
  overflow: hidden;
}

.feedback-list {
  display: grid;
  gap: 8px;
  padding: 18px;
}

.feedback-list-head,
.feedback-summary {
  display: grid;
  grid-template-columns: 22px minmax(130px, 0.9fr) minmax(120px, 0.75fr) minmax(200px, 1.25fr) 82px 82px 82px 48px;
  align-items: center;
  column-gap: 10px;
  font-size: 14px;
}

.feedback-list-head {
  padding: 0 14px 2px;
  color: var(--muted);
  font-weight: 700;
}

.feedback-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
  transition: border-color 160ms ease, background 160ms ease;
}

.feedback-row:hover {
  border-color: #b9c8cc;
}

.feedback-row[open] {
  background: #fbfcfd;
}

.feedback-summary {
  min-height: 52px;
  padding: 10px 14px;
  cursor: pointer;
  list-style: none;
}

.feedback-summary::-webkit-details-marker {
  display: none;
}

.feedback-select,
#feedback-select-all {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--primary);
}

.feedback-col {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--ink);
  font-size: 14px;
}

.feedback-col-student {
  display: grid;
  gap: 1px;
}

.feedback-col-student strong {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.feedback-col-student span,
.feedback-col-time,
.feedback-expand-text {
  color: var(--muted);
  font-size: 13px;
}

.feedback-row[open] .feedback-expand-text {
  color: var(--primary-dark);
  font-weight: 700;
}

.feedback-action-button {
  width: 100%;
  height: 32px;
  padding: 0 10px;
  border-color: var(--line);
  background: #f7f8f9;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
}

.feedback-action-button:not(:disabled):hover {
  background: #edf5f3;
}

.feedback-action-button.selected {
  background: #e7f4ec;
  color: var(--success);
  border-color: #badfca;
}

.feedback-action-button.reject-feedback {
  color: var(--danger);
}

.feedback-action-button.reject-feedback:not(:disabled):hover,
.feedback-action-button.reject-feedback.selected {
  background: #fdebea;
  border-color: #f5c6c2;
  color: var(--danger);
}

.feedback-action-button.delete-feedback {
  color: var(--muted);
}

.feedback-action-button.delete-feedback:not(:disabled):hover {
  background: #f1f3f4;
  color: var(--danger);
}

.feedback-action-button:disabled {
  cursor: not-allowed;
  opacity: 1;
}

.feedback-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
}

.feedback-detail-item {
  display: grid;
  gap: 6px;
  min-width: 0;
  padding-top: 14px;
}

.feedback-detail-item p,
.feedback-subtext {
  margin: 0;
  overflow-wrap: anywhere;
}

.feedback-detail-wide {
  grid-column: span 2;
}

.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 14px 18px 18px;
}

.page-button {
  min-width: 88px;
  height: 36px;
  border-color: var(--line);
  background: #fff;
  color: var(--primary-dark);
}

.page-button:disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: #f2f4f5;
}

.page-info {
  color: var(--muted);
  font-size: 14px;
}

.table-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

#search-input {
  width: 240px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  font: inherit;
  background: #fff;
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  height: 40px;
}

.segmented button {
  height: 38px;
  border: 0;
  border-radius: 0;
  background: #fff;
  color: #43515a;
}

.segmented button.active {
  background: #ddebe8;
  color: var(--primary-dark);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 1040px;
}

th,
td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 12px 14px;
  vertical-align: middle;
}

th {
  color: var(--muted);
  background: #fafbfc;
  font-size: 13px;
  font-weight: 700;
}

td {
  font-size: 14px;
}

.ticket-count {
  color: var(--primary-dark);
  font-size: 16px;
}

.student-select,
#student-select-page {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--primary);
}

.progress {
  display: grid;
  gap: 6px;
}

.progress-track {
  width: 120px;
  height: 8px;
  border-radius: 999px;
  background: #e7ecef;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--primary);
}

.status {
  display: inline-flex;
  align-items: center;
  min-width: 52px;
  justify-content: center;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 700;
}

.status.ok {
  color: var(--success);
  background: #e7f4ec;
}

.status.warn {
  color: var(--danger);
  background: #fdebea;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 30px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  min-width: 220px;
  max-width: min(420px, calc(100vw - 36px));
  padding: 12px 14px;
  background: #17252a;
  color: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 10;
}

.student-page {
  min-height: 100vh;
}

.student-topbar {
  background: #20343a;
}

.readonly-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: #e7f4ec;
  font-weight: 700;
}

.student-main {
  width: min(860px, calc(100vw - 32px));
}

.query-panel,
.student-result {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.query-panel {
  padding: 20px;
}

.student-query-form {
  display: grid;
  gap: 8px;
}

.student-query-form label {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.student-query-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

#student-id {
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  font: inherit;
  background: #fff;
}

.student-error {
  margin-top: 12px;
  color: var(--danger);
  font-weight: 700;
}

.hidden {
  display: none;
}

.student-result {
  margin-top: 16px;
  padding: 20px;
}

.student-result-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.result-kicker {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.student-result-head h2 {
  margin-top: 4px;
  font-size: 26px;
}

.student-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.student-stat {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  background: #fafbfc;
  min-height: 84px;
}

.student-stat span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.student-stat strong {
  display: block;
  margin-top: 8px;
  font-size: 22px;
  line-height: 1.15;
  word-break: break-word;
}

.student-progress {
  margin-top: 18px;
}

.student-progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.student-progress-label span:first-child {
  color: var(--ink);
  font-weight: 800;
}

.student-progress-track {
  height: 12px;
  margin-top: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: #e7ecef;
}

.student-progress-bar {
  width: 0;
  height: 100%;
  background: var(--primary);
  transition: width 180ms ease;
}

.event-list-block {
  margin-top: 22px;
}

.feedback-result-block {
  margin-top: 22px;
}

.feedback-result-block h2 {
  font-size: 18px;
}

.feedback-result-list {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.feedback-result-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  background: #fff;
}

.feedback-result-item div {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.feedback-result-item strong,
.feedback-result-item span {
  display: block;
}

.feedback-result-item span,
.feedback-result-note {
  color: var(--muted);
  font-size: 13px;
}

.feedback-result-note {
  margin: 2px 0 0;
  overflow-wrap: anywhere;
}

.feedback-action {
  margin-top: 22px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.feedback-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 10px;
}

.feedback-form label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.feedback-form select,
.feedback-form textarea,
.feedback-form input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}

.feedback-form textarea {
  min-height: 96px;
  resize: vertical;
}

.feedback-form button {
  justify-self: start;
  margin-top: 4px;
}

.feedback-tip {
  margin-top: 10px;
  color: var(--primary-dark);
  font-weight: 700;
}

.modal-open {
  overflow: hidden;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 20;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(18, 28, 32, 0.52);
}

.modal-panel {
  position: relative;
  width: min(620px, calc(100vw - 36px));
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 60px rgba(20, 30, 34, 0.24);
  padding: 18px;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.modal-head h2 {
  font-size: 20px;
}

.modal-close {
  width: 34px;
  height: 34px;
  padding: 0;
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.event-list-block h2 {
  font-size: 18px;
}

.event-list {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.event-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  background: #fff;
}

.event-item strong,
.event-item span,
.event-item time {
  display: block;
}

.event-item span,
.event-item time {
  color: var(--muted);
  font-size: 13px;
}

.student-empty {
  color: var(--muted);
  padding: 14px 0;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #20343a;
}

.login-main {
  width: min(420px, calc(100vw - 32px));
  margin: 0;
}

.login-panel {
  display: grid;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 60px rgba(20, 30, 34, 0.24);
  padding: 24px;
}

.login-panel h1 {
  margin: 0;
  font-size: 26px;
}

.login-panel p {
  color: var(--muted);
}

.login-form {
  display: grid;
  gap: 10px;
}

.login-form label {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.login-form input {
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  font: inherit;
}

.student-link {
  color: var(--primary-dark);
  font-weight: 700;
  text-decoration: none;
}

@media (max-width: 980px) {
  .topbar,
  .table-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .admin-menu {
    justify-content: flex-start;
    width: 100%;
  }

  .metrics,
  .workbench,
  .rules-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel {
    grid-template-columns: 1fr;
  }

  .feedback-list-head {
    display: none;
  }

  .feedback-summary {
    grid-template-columns: 22px minmax(130px, 1fr) minmax(120px, 0.8fr) minmax(160px, 1fr) repeat(4, minmax(72px, auto));
    row-gap: 8px;
  }

  .feedback-batch-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .student-export-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .file-picker,
  #search-input {
    width: 100%;
    max-width: none;
  }
}

@media (max-width: 620px) {
  main {
    width: min(100vw - 20px, 1180px);
    margin-top: 12px;
  }

  .topbar {
    padding: 22px 16px;
  }

  .metrics,
  .workbench,
  .rules-list {
    grid-template-columns: 1fr;
  }

  .feedback-summary,
  .feedback-detail-grid {
    grid-template-columns: 1fr;
  }

  .feedback-detail-wide {
    grid-column: span 1;
  }

  .topbar-actions,
  .toolbar-controls,
  .segmented {
    width: 100%;
  }

  .admin-menu {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .menu-link,
  .template-menu > summary {
    width: 100%;
  }

  .template-menu-list {
    left: 0;
    right: auto;
  }

  .topbar-actions .button,
  .toolbar-controls > *,
  .segmented button {
    flex: 1;
  }

  #grade-select {
    flex: 1;
    min-width: 140px;
  }

  .student-query-row,
  .student-stat-grid {
    grid-template-columns: 1fr;
  }

  .student-result-head,
  .student-progress-label,
  .event-item,
  .feedback-result-item,
  .pagination-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .pagination-bar {
    justify-content: flex-start;
  }
}