:root {
  --bg: #f4f7f6;
  --panel: #ffffff;
  --text: #1d2b29;
  --muted: #687976;
  --line: #dbe5e2;
  --primary: #187363;
  --primary-dark: #10584c;
  --primary-soft: #e7f3f0;
  --blue: #285f9f;
  --blue-soft: #eaf2fb;
  --green-soft: #edf8ef;
  --amber-soft: #fff6df;
  --red: #bd3434;
  --red-soft: #fff0f0;
  --shadow: 0 14px 34px rgba(23, 59, 52, 0.10);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255,255,255,.65), rgba(244,247,246,.95)),
    radial-gradient(circle at 12% 10%, rgba(24,115,99,.10), transparent 28%),
    var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: .55;
}

.app-shell {
  display: grid;
  grid-template-columns: 302px minmax(0, 1fr);
  min-height: 100vh;
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 86px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 18px;
  border-right: 1px solid var(--line);
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.brand img {
  width: 58px;
  height: 74px;
  object-fit: cover;
  object-position: top;
  border-radius: 6px;
  border: 1px solid var(--line);
  box-shadow: 0 8px 18px rgba(0,0,0,.10);
}

.sidebar-toggle {
  margin-left: auto;
  flex-shrink: 0;
}

.sidebar-collapsed .brand {
  justify-content: center;
}

.sidebar-collapsed .brand img {
  width: 40px;
  height: 52px;
}

.sidebar-collapsed .brand div,
.sidebar-collapsed .nav-btn span,
.sidebar-collapsed .account-panel,
.sidebar-collapsed .filter-panel,
.sidebar-collapsed .mini-stats {
  display: none;
}

.sidebar-collapsed .nav-btn {
  justify-content: center;
  padding: 9px;
}

.brand h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0;
}

.brand p,
.eyebrow,
.summary-line,
.browse-head,
.filter-panel label,
.mini-stats span {
  color: var(--muted);
}

.brand p {
  margin: 2px 0 0;
}

.nav {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.nav-btn,
.soft-btn,
.primary-btn,
.danger-btn,
.icon-btn {
  min-height: 42px;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 12px;
}

.nav-btn {
  justify-content: flex-start;
  border-color: transparent;
  background: transparent;
}

.nav-btn.active {
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-color: #b8d9d2;
  font-weight: 700;
}

.nav-btn svg,
.soft-btn svg,
.primary-btn svg,
.danger-btn svg,
.icon-btn svg {
  width: 18px;
  height: 18px;
}

.filter-panel,
.account-panel,
.mini-stats,
.question-card,
.exam-setup,
.dashboard,
.browse-head,
.wrong-toolbar,
.manage-panel,
.discussion-panel,
.timeline-toolbar,
.timeline-summary,
.timeline-card,
.timeline-table-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.filter-panel {
  padding: 14px;
}

.account-panel {
  padding: 14px;
  margin-bottom: 14px;
}

.account-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.account-head h2 {
  margin: 0;
  font-size: 15px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--amber-soft);
  color: #775700;
  font-size: 12px;
  font-weight: 700;
}

.status-pill.online {
  background: var(--green-soft);
  color: #17724a;
}

.status-pill.error {
  background: var(--red-soft);
  color: var(--red);
}

.account-form,
.account-signed {
  display: grid;
  gap: 8px;
}

.account-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.account-panel input {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 9px;
  background: #fff;
  color: var(--text);
}

.account-signed strong {
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 0 2px;
}

.filter-panel h2 {
  margin: 0 0 10px;
  font-size: 15px;
}

.filter-panel label {
  display: grid;
  gap: 5px;
  margin-bottom: 10px;
  font-size: 13px;
}

.filter-panel input,
.filter-panel select,
.exam-setup input {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 9px;
  background: #fff;
  color: var(--text);
}

.filter-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  flex: 1;
}

.mini-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 14px;
  overflow: hidden;
}

.mini-stats div {
  padding: 12px 8px;
  text-align: center;
  border-right: 1px solid var(--line);
}

.mini-stats div:last-child {
  border-right: 0;
}

.mini-stats strong {
  display: block;
  font-size: 22px;
  color: var(--primary);
}

.main {
  padding: 20px;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 13px;
}

.topbar h2 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0;
}

.top-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.soft-btn {
  background: #fff;
}

.primary-btn {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.danger-btn {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.dashboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-bottom: 14px;
  overflow: hidden;
}

.stat-card {
  padding: 14px 16px;
  border-right: 1px solid var(--line);
}

.stat-card:last-child {
  border-right: 0;
}

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

.stat-card strong {
  font-size: 24px;
  color: var(--primary-dark);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.question-card {
  overflow: hidden;
}

.question-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: #fbfdfc;
}

.badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  background: var(--blue-soft);
  color: var(--blue);
}

.badge.multi {
  background: var(--green-soft);
  color: #227142;
}

.badge.judge {
  background: var(--amber-soft);
  color: #7a5a00;
}

.badge.chapter {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.badge.dispute {
  background: var(--amber-soft);
  color: #7a5a00;
  border: 1px solid #ead18b;
}

.question-body {
  padding: 16px;
}

.stem {
  font-size: 19px;
  line-height: 1.55;
  margin: 0 0 14px;
}

.options {
  display: grid;
  gap: 9px;
}

.option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  min-height: 46px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.option input {
  margin-top: 5px;
}

.option.correct {
  background: var(--green-soft);
  border-color: #9fd6b6;
}

.option.wrong {
  background: var(--red-soft);
  border-color: #e2a6a6;
}

.question-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
}

.head-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.head-actions .icon-btn {
  min-width: 34px;
  min-height: 34px;
  padding: 6px;
}

.icon-btn.is-favorite {
  background: var(--amber-soft);
  color: #8a6500;
  border-color: #ead18b;
}

.analysis {
  margin-top: 14px;
  padding: 12px;
  border-left: 4px solid var(--primary);
  border-radius: 6px;
  background: #f7fbfa;
  line-height: 1.7;
}

.analysis-help {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.option-analysis {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.option-note {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.option-note strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  font-size: 13px;
}

.option-note.right strong {
  background: var(--green-soft);
  color: #168a5a;
}

.option-note.wrong strong {
  background: var(--red-soft);
  color: var(--red);
}

.result-ok {
  color: #168a5a;
  font-weight: 700;
}

.result-bad {
  color: var(--red);
  font-weight: 700;
}

.exam-setup {
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 1fr)) auto auto;
  gap: 10px;
  align-items: end;
  padding: 14px;
  margin-bottom: 12px;
}

.exam-setup label {
  color: var(--muted);
  font-size: 13px;
}

.summary-line {
  margin-bottom: 10px;
}

.exam-list,
.browse-list {
  display: grid;
  gap: 12px;
}

.exam-item,
.browse-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.question-index {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: #fbfdfd;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

details.browse-item summary {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

details.browse-item[open] summary {
  border-bottom: 1px solid var(--line);
  background: #fbfdfd;
}

.browse-status-correct {
  border-color: #9fd6b6;
  background: #fbfffc;
}

.browse-status-correct > summary {
  background: var(--green-soft);
}

.browse-status-wrong {
  border-color: #e2a6a6;
  background: #fffafa;
}

.browse-status-wrong > summary {
  background: var(--red-soft);
}

.browse-status-disputed {
  border-color: #ead18b;
  background: #fffdf5;
}

.browse-status-disputed > summary {
  background: var(--amber-soft);
}

.browse-status-unseen > summary {
  background: #fff;
}

.browse-status-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.browse-status-correct .browse-status-label {
  border-color: #9fd6b6;
  color: #17724a;
}

.browse-status-wrong .browse-status-label {
  border-color: #e2a6a6;
  color: var(--red);
}

.browse-status-disputed .browse-status-label {
  border-color: #ead18b;
  color: #7a5a00;
}

.dispute-warning {
  display: grid;
  gap: 4px;
  margin: 10px 0;
  padding: 10px;
  border: 1px solid #ead18b;
  border-radius: 6px;
  background: var(--amber-soft);
  color: #6f5200;
}

.dispute-warning strong {
  color: #7a5a00;
}

.exam-item .question-card,
.browse-item .question-card {
  border: 0;
  box-shadow: none;
}

.browse-head,
.wrong-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  margin-bottom: 12px;
}

.empty {
  padding: 28px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.7);
}

.pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  color: var(--muted);
}

.hidden {
  display: none !important;
}

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

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 28, 26, .42);
}

.modal-panel {
  position: relative;
  z-index: 1;
  width: min(860px, 100%);
  max-height: min(92vh, 900px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 24px 70px rgba(14, 36, 33, .25);
  padding: 16px;
}

.modal-head,
.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.modal-head {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.modal-head h3 {
  margin: 0;
  font-size: 20px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.modal-panel label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.modal-panel input,
.modal-panel select,
.modal-panel textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: #fff;
  color: var(--text);
}

.modal-panel textarea {
  resize: vertical;
  line-height: 1.55;
}

.wide-field {
  margin-top: 10px;
}

.form-grid .wide-field {
  grid-column: 1 / -1;
  margin-top: 0;
}

.modal-actions {
  justify-content: flex-end;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.manage-grid {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.2fr);
  gap: 12px;
}

.manage-panel {
  padding: 14px;
}

.manage-panel h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.wide-panel {
  grid-column: 1 / -1;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-bottom: 12px;
}

.ai-inline-form {
  grid-template-columns: 90px auto auto;
  justify-content: start;
}

.inline-form input {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
}

.manage-list,
.audit-list {
  display: grid;
  gap: 8px;
}

.manage-row,
.audit-row {
  display: grid;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
}

.manage-row-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.manage-row-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.meta-line {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.audit-row {
  grid-template-columns: minmax(140px, .8fr) minmax(0, 1.4fr) minmax(0, 2fr);
  align-items: start;
}

.audit-row strong {
  color: var(--primary-dark);
}

.audit-detail {
  max-height: 160px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 12px;
  color: var(--muted);
}

.timeline-toolbar {
  display: grid;
  grid-template-columns: minmax(120px, .7fr) minmax(160px, .9fr) minmax(220px, 1.3fr) auto;
  gap: 10px;
  align-items: end;
  padding: 14px;
  margin-bottom: 12px;
}

.timeline-toolbar label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 13px;
}

.timeline-toolbar input,
.timeline-toolbar select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: #fff;
  color: var(--text);
}

.timeline-summary {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  margin-bottom: 12px;
  color: var(--muted);
}

.timeline-summary span:first-child {
  color: var(--primary-dark);
  font-weight: 700;
}

.timeline-layout {
  display: grid;
  grid-template-columns: minmax(300px, .9fr) minmax(0, 1.3fr);
  gap: 12px;
  align-items: start;
}

.timeline-list {
  position: relative;
  display: grid;
  gap: 12px;
  padding-left: 18px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: #c6dcd7;
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
}

.timeline-marker {
  position: relative;
  z-index: 1;
  width: 12px;
  height: 12px;
  margin-top: 18px;
  border-radius: 999px;
  border: 2px solid #fff;
  background: var(--primary);
  box-shadow: 0 0 0 2px #b8d9d2;
}

.timeline-card {
  padding: 12px;
}

.timeline-card-head,
.timeline-card-foot {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.timeline-card-head strong {
  color: var(--primary-dark);
  font-size: 16px;
}

.timeline-card h3 {
  margin: 8px 0 5px;
  font-size: 17px;
  line-height: 1.45;
}

.timeline-card p {
  margin: 10px 0;
  line-height: 1.7;
  word-break: break-word;
}

.timeline-card-foot {
  color: var(--muted);
  font-size: 12px;
}

.content-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 10px;
}

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

.timeline-table {
  width: 100%;
  min-width: 920px;
  border-collapse: collapse;
  font-size: 14px;
}

.timeline-table th,
.timeline-table td {
  padding: 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
  line-height: 1.6;
}

.timeline-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #edf6f3;
  color: var(--primary-dark);
}

.timeline-table td:first-child,
.timeline-table td:last-child {
  white-space: nowrap;
}

.discussion-panel {
  padding: 14px;
}

.discussion-compose {
  display: grid;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.discussion-compose textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  resize: vertical;
  line-height: 1.55;
}

.discussion-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.discussion-list {
  display: grid;
  gap: 10px;
}

.discussion-post {
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
}

.discussion-post-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.discussion-post-actions {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.discussion-message {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.65;
}

.badge.pinned {
  margin-left: 6px;
  background: var(--amber-soft);
  color: #7a5a00;
  border: 1px solid #ead18b;
}

.reply-area {
  display: grid;
  gap: 8px;
}

.reply-list {
  display: grid;
  gap: 8px;
  margin-top: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--primary-soft);
}

.reply-item {
  display: grid;
  gap: 4px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.reply-compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 10px;
}

.reply-compose input {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
}

.keypoints-list {
  display: grid;
  gap: 14px;
}

.keypoint-section {
  display: grid;
  gap: 10px;
}

.keypoint-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.keypoint-section-head h3 {
  margin: 0;
  font-size: 19px;
}

.keypoint-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.keypoint-card,
.preview-row {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.keypoint-card {
  padding: 12px;
}

.keypoint-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.keypoint-card h4 {
  margin: 10px 0 6px;
  font-size: 16px;
}

.keypoint-card p {
  margin: 0;
  line-height: 1.7;
}

.import-help {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.import-preview {
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
  margin-top: 12px;
}

.preview-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 10px;
}

.preview-row.duplicate {
  background: var(--red-soft);
  border-color: #e2a6a6;
}

.version-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px 150px;
  gap: 12px;
  align-items: stretch;
  padding: 18px;
  margin-bottom: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.version-hero h2 {
  margin: 10px 0 6px;
  font-size: 28px;
}

.version-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.version-stats {
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
}

.version-stats strong {
  color: var(--primary-dark);
  font-size: 26px;
}

.version-stats span {
  color: var(--muted);
  font-size: 13px;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.version-card {
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.version-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 17px;
}

.version-card h3 svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
}

.version-list {
  display: grid;
  gap: 8px;
  padding-left: 20px;
  margin: 0;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.feature-grid div,
.version-log-item {
  display: grid;
  gap: 4px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
}

.feature-grid strong,
.version-log-item strong {
  color: var(--primary-dark);
}

.feature-grid span,
.version-log-item p,
.version-log-item time {
  color: var(--muted);
  line-height: 1.6;
}

.version-log {
  display: grid;
  gap: 8px;
}

.version-log-item p {
  margin: 0;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
  }

  .dashboard,
  .exam-setup,
  .form-grid,
  .manage-grid,
    .audit-row,
    .timeline-toolbar,
    .timeline-layout,
    .keypoint-grid,
    .version-hero,
    .version-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .main,
  .sidebar {
    padding: 12px;
  }

  .dashboard,
  .exam-setup,
  .form-grid,
  .manage-grid,
  .audit-row,
  .inline-form,
  .timeline-toolbar,
  .timeline-layout,
  .keypoint-grid,
  .version-hero,
  .version-grid,
  .feature-grid,
  .reply-compose {
    grid-template-columns: 1fr;
  }

  .question-actions,
  .browse-head,
  .wrong-toolbar,
  .discussion-actions,
  .timeline-summary {
    align-items: stretch;
    flex-direction: column;
  }

  details.browse-item summary {
    grid-template-columns: auto auto minmax(0, 1fr);
  }

  .browse-status-label {
    grid-column: 1 / -1;
    justify-self: start;
  }
}