:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --line: #d9e1ec;
  --text: #172033;
  --muted: #66758a;
  --primary: #1769e0;
  --primary-dark: #0f52b7;
  --danger: #b42318;
  --ok: #0f766e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 20px;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.top-actions {
  justify-content: flex-end;
}

.admin-shell {
  width: min(1500px, calc(100% - 48px));
  margin: 24px auto 32px;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.admin-sidebar {
  position: sticky;
  top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.nav-link {
  width: 100%;
  min-height: 36px;
  padding: 0 12px;
  font-size: 14px;
  justify-content: flex-start;
}

.nav-link.active {
  background: var(--primary);
  color: #fff;
}

.container {
  width: min(980px, calc(100% - 32px));
  margin: 32px auto;
}

.admin-main {
  width: 100%;
  max-width: none;
  margin: 0;
}

.workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.admin-view {
  min-width: 0;
}

.panel,
.record,
.task-row {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.panel {
  padding: 24px;
}

.announcement-board {
  margin-top: 12px;
  padding: 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.announcement-board h2 {
  font-size: 22px;
}

.announcement-content {
  display: grid;
  gap: 14px;
}

.announcement-content p,
.announcement-content figure {
  margin: 0;
}

.announcement-content a {
  color: var(--primary);
  font-weight: 700;
}

.announcement-content img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--line);
}

h1,
h2,
h3 {
  margin: 0 0 16px;
}

p {
  color: var(--muted);
}

label {
  display: block;
  margin: 12px 0 6px;
  color: var(--muted);
  font-size: 14px;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}

textarea {
  min-height: 150px;
  resize: vertical;
}

.compact-textarea {
  min-height: 88px;
}

button,
.button {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  padding: 0 14px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

button.secondary,
.button.secondary {
  background: #e9eef7;
  color: var(--text);
}

button.danger {
  background: var(--danger);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.link-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.upload-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
}

.message {
  margin-top: 14px;
  padding: 12px;
  border-radius: 6px;
  display: none;
}

.message.show {
  display: block;
}

.message.ok {
  background: #e6f7f4;
  color: var(--ok);
}

.message.error {
  background: #fff1f0;
  color: var(--danger);
}

.card-key {
  margin-top: 16px;
  padding: 16px;
  border-radius: 8px;
  background: #0f172a;
  color: #fff;
  word-break: break-all;
  font-size: 20px;
  letter-spacing: 0;
}

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

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff;
}

.stat strong {
  display: block;
  font-size: 24px;
}

.record,
.task-row {
  padding: 14px;
  margin-top: 10px;
}

.subsection {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.muted {
  color: var(--muted);
}

.hidden {
  display: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

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

.pagination {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.pager-summary {
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 760px) {
  .topbar {
    height: auto;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .admin-shell {
    width: calc(100% - 24px);
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 12px;
  }

  .admin-sidebar {
    top: 12px;
  }

  .grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .upload-row {
    grid-template-columns: 1fr;
  }
}