/* 公共样式：色板 + 基础排版 + 卡片 / 按钮 / 表单 / 表格 */

:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #182033;
  --text-2: #475569;
  --muted: #68728a;
  --primary: #3b6df6;
  --primary-dark: #2952c8;
  --primary-bg: #edf2ff;
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --border: #e5e9f2;
  --divider: #f1f5f9;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  margin: 0 0 12px;
}

/* ── 顶部导航 ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.topbar .brand {
  font-size: 17px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.topbar .tabs {
  display: flex;
  gap: 4px;
  align-items: center;
  overflow: visible;
  flex-shrink: 1;
  min-width: 0;
}

.topbar .tabs a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-weight: 500;
  white-space: nowrap;
  font-size: 13px;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.topbar .tabs a:hover {
  background: var(--divider);
  text-decoration: none;
}

.topbar .tabs a.active {
  background: var(--primary-bg);
  color: var(--primary);
}

.topbar .tabs .nav-link-external {
  color: var(--muted);
  font-size: 12px;
  margin-left: 8px;
}

.topbar .user-info {
  font-size: 13px;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar .user-info .user-badge {
  background: var(--primary-bg);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.topbar .user-info button {
  margin-left: 0;
}

/* ── 导航下拉菜单 ── */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-weight: 500;
  white-space: nowrap;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}

.nav-dropdown-trigger.active {
  background: var(--primary-bg);
  color: var(--primary);
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  min-width: 140px;
  z-index: 100;
  padding: 4px 0;
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  transition: background 0.1s;
}

.nav-dropdown-menu a:hover {
  background: var(--divider);
  text-decoration: none;
}

.nav-dropdown-menu a.active {
  color: var(--primary);
  background: var(--primary-bg);
  border-left: 3px solid var(--primary);
  padding-left: 13px;
}

/* ════════════════════ 左侧边栏（管理后台） ════════════════════ */
:root {
  --sidebar-w: 232px;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #3d4d70 0%, #354563 100%);
  color: #dce3ef;
  z-index: 50;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

/* 品牌区 */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 18px 14px;
}
.sidebar-brand .brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, #4d7cfe, #6f9bff);
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(77, 124, 254, 0.4);
}
.sidebar-brand .brand-text {
  display: flex;
  flex-direction: column;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  line-height: 1.25;
}
.sidebar-brand .brand-text small {
  font-size: 11px;
  font-weight: 500;
  color: #8794ad;
}

/* 导航列表 */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 6px 12px 12px;
}
.sidebar-nav::-webkit-scrollbar {
  width: 5px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

.side-group-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #6b7799;
  font-weight: 600;
  padding: 14px 12px 6px;
}

.side-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  margin: 2px 0;
  border-radius: 9px;
  color: #c2ccdd;
  font-size: 13.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.side-item:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
  text-decoration: none;
}
.side-item.active {
  background: linear-gradient(90deg, rgba(77, 124, 254, 0.95), rgba(77, 124, 254, 0.75));
  color: #fff;
  box-shadow: 0 4px 14px rgba(77, 124, 254, 0.35);
}
.side-item .nav-ic {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  opacity: 0.9;
}
.side-item.active .nav-ic {
  opacity: 1;
}

/* 底部用户区 */
.sidebar-footer {
  padding: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.side-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 6px 10px;
}
.side-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4d7cfe, #6f9bff);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.side-user-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  min-width: 0;
}
.side-user-meta b {
  color: #fff;
  font-size: 13.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.side-user-meta small {
  color: #8794ad;
  font-size: 11.5px;
}
.side-logout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9px;
  background: transparent;
  color: #c2ccdd;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.side-logout:hover {
  background: rgba(220, 38, 38, 0.16);
  border-color: rgba(220, 38, 38, 0.5);
  color: #ff8a8a;
}
.side-logout .nav-ic {
  width: 16px;
  height: 16px;
}

/* 汉堡按钮 + 遮罩（默认桌面隐藏） */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 60;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.sidebar-toggle svg {
  width: 20px;
  height: 20px;
}
.sidebar-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 40;
}
.sidebar-mask.show {
  display: block;
}

/* 管理后台内容区：让出侧边栏宽度 */
#admin-app .container {
  margin-left: var(--sidebar-w);
  max-width: none;
  padding: 24px 32px;
}

/* ── 布局容器 ── */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-header h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
}

/* ── 按钮 ── */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
}

button:hover, .btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

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

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

.btn-danger {
  color: var(--danger);
  border-color: #fecaca;
}

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

.btn-ghost {
  border-color: transparent;
  color: var(--text-2);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

/* ── 表单 ── */
.form-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

/* ════════════ 新建/编辑试卷：分区表单 ════════════ */
.pf-form { max-width: 860px; }

/* 分区块 */
.pf-section {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 16px;
  background: var(--surface);
}
.pf-section-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.pf-section-head .pf-step {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.pf-section-head small {
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
}

/* 字段网格：窄屏单列，宽屏可两列 */
.pf-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 20px;
}
.pf-grid .pf-field.full { grid-column: 1 / -1; }
.pf-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 0; }
.pf-field > label {
  font-weight: 500;
  color: var(--text-2);
  font-size: 13px;
}
.pf-field .pf-hint {
  color: var(--muted);
  font-size: 12px;
  margin: 2px 0 0;
}
.pf-inline-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
}
.pf-inline-check input { width: auto !important; }

/* 组卷方式卡片选择 */
.pf-source-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.pf-source-card {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--surface);
}
.pf-source-card:hover { border-color: var(--primary); }
.pf-source-card.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  box-shadow: 0 0 0 3px rgba(59, 109, 246, 0.12);
}
.pf-source-card .pf-sc-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.pf-source-card .pf-sc-title .pf-sc-ic {
  width: 18px; height: 18px; color: var(--primary);
}
.pf-source-card .pf-sc-desc {
  color: var(--muted);
  font-size: 12px;
  margin-top: 6px;
  line-height: 1.5;
}

/* 底部操作条（吸底） */
.pf-actions {
  position: sticky;
  bottom: 0;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  padding: 14px 0 4px;
  margin-top: 4px;
  background: linear-gradient(180deg, rgba(245,247,251,0) 0%, var(--bg) 40%);
}
.pf-actions .pf-actions-tip {
  margin-right: auto;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 720px) {
  .pf-grid, .pf-source-cards { grid-template-columns: 1fr; }
}

/* ════════════ 新建/编辑题目：分区表单 + 结构化选项 ════════════ */
.qf-form { max-width: 820px; }

/* 选项行 */
.qf-opt-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  background: var(--surface);
  transition: border-color 0.15s, background 0.15s;
}
.qf-opt-row.is-answer {
  border-color: var(--success);
  background: #f0fdf4;
}
/* 答案标记（单选圆形/多选方形），用原生 input 即可 */
.qf-opt-mark {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--success);
}
.qf-opt-letter {
  width: 22px;
  flex-shrink: 0;
  text-align: center;
  font-weight: 700;
  color: var(--text-2);
}
.qf-opt-row.is-answer .qf-opt-letter { color: var(--success); }
.qf-opt-body { flex: 1; min-width: 0; }
.qf-opt-input { width: 100%; }
.qf-opt-img-wrap {
  margin-top: 6px;
  display: none;
  align-items: center;
  gap: 8px;
}
.qf-opt-img-wrap.show { display: flex; }
.qf-opt-img-wrap img {
  max-height: 56px;
  max-width: 120px;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.qf-opt-actions { display: flex; gap: 4px; flex-shrink: 0; }
.qf-opt-iconbtn {
  width: 30px;
  height: 30px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
}
.qf-opt-iconbtn svg { width: 15px; height: 15px; }
.qf-opt-del:hover { border-color: var(--danger); color: var(--danger); }

.qf-opt-hint {
  color: var(--muted);
  font-size: 12px;
  margin: 2px 0 10px;
}
.qf-answer-tip {
  font-size: 12px;
  color: var(--success);
  font-weight: 500;
}

/* 题干媒体预览 */
.qf-media-preview {
  display: none;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}
.qf-media-preview.show { display: flex; }
.qf-media-item {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 6px;
  background: var(--surface);
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}
.qf-media-item img {
  max-width: 200px;
  max-height: 140px;
  border-radius: 6px;
  display: block;
  object-fit: contain;
}
.qf-media-item video {
  max-width: 260px;
  max-height: 160px;
  border-radius: 6px;
  display: block;
  background: #000;
}
.qf-media-item .qf-media-type {
  font-size: 11px;
  color: var(--muted);
  text-align: center;
}
.qf-media-item .qf-media-remove {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--danger);
  font-size: 13px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}
.qf-media-item .qf-media-remove:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}
.qf-media-fail {
  display: inline-block;
  padding: 8px 12px;
  background: #f5f5f5;
  border: 1px dashed #ccc;
  border-radius: 6px;
  color: #999;
  font-size: 12px;
}


.form-row label {
  font-weight: 500;
  color: var(--text-2);
}

input:not([type]),
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
}

textarea {
  min-height: 80px;
  resize: vertical;
}

/* ── 表格 ── */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.table th, .table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--divider);
}

.table th {
  background: var(--divider);
  font-weight: 600;
  color: var(--text-2);
}

.table tr:hover td {
  background: #fafbfd;
}

/* ── 标签 ── */
.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 500;
  border-radius: 4px;
  background: var(--divider);
  color: var(--text-2);
  margin-right: 4px;
}

.tag-primary { background: var(--primary-bg); color: var(--primary); }
.tag-success { background: #ecfdf5; color: var(--success); }
.tag-danger { background: #fef2f2; color: var(--danger); }
.tag-warning { background: #fffbeb; color: var(--warning); }

/* ── 提示 ── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  font-size: 13px;
}

.alert-info { background: var(--primary-bg); color: var(--primary-dark); }
.alert-success { background: #ecfdf5; color: var(--success); }
.alert-error { background: #fef2f2; color: var(--danger); }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 48px 16px;
  font-size: 13px;
}

.toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.spacer {
  flex: 1;
}

/* ── 试卷卡片 ── */
.paper-list {
  display: grid;
  gap: 12px;
}

.paper-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.15s;
}

.paper-item:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(59, 109, 246, 0.08);
}

.paper-item.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.paper-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.paper-meta > span {
  margin-right: 12px;
}

/* ── 答题页特有 ── */

/* 防作弊：禁止文本选择（输入框/文本域除外，保证填空、问答可正常作答） */
.no-select {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.no-select input,
.no-select textarea {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* 防截图/录屏增强 */
#exam-root {
  -webkit-touch-callout: none; /* iOS 禁止长按菜单 */
  transition: filter 0.1s, opacity 0.05s;
}

/* 防录屏混合层 */
#anti-record-layer {
  mix-blend-mode: saturation;
}

.exam-shell {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 16px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}

.question-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}

.question-block .qhead {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--muted);
}

.question-block .qcontent {
  font-size: 15px;
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: 16px;
}

.options {
  display: grid;
  gap: 8px;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.1s;
}

.option:hover {
  border-color: var(--primary);
  background: var(--primary-bg);
}

.option input[type="radio"],
.option input[type="checkbox"] {
  margin-top: 4px;
  flex-shrink: 0;
}

.option.correct {
  border-color: var(--success);
  background: #ecfdf5;
}

.option.wrong {
  border-color: var(--danger);
  background: #fef2f2;
}

.exam-side {
  position: sticky;
  top: 80px;
  align-self: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.exam-side .timer {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  margin-bottom: 12px;
}

.exam-side .nav-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-bottom: 16px;
}

.exam-side .nav-item {
  padding: 6px 0;
  font-size: 12px;
  text-align: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
}

.exam-side .nav-item.answered {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

@media (max-width: 760px) {
  .exam-shell {
    grid-template-columns: 1fr;
  }
  .exam-side {
    position: static;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .topbar {
    padding: 8px 12px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .topbar .brand {
    font-size: 14px;
  }
  .topbar .tabs a {
    padding: 4px 8px;
    font-size: 12px;
  }
  .topbar .user-info {
    font-size: 12px;
    width: 100%;
    text-align: right;
  }
  .container {
    padding: 12px;
  }
  /* 管理后台移动端：侧边栏改为抽屉式 */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-toggle {
    display: flex;
  }
  #admin-app .container {
    margin-left: 0;
    padding: 64px 12px 12px;
  }
  .auth-card {
    padding: 24px 16px;
  }
  .card {
    padding: 14px;
  }
  .table {
    font-size: 12px;
  }
  .table th, .table td {
    padding: 6px 8px;
  }
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .auth-card {
    width: 100%;
    border-radius: 0;
    min-height: 100vh;
  }
  .auth-page {
    padding: 0;
  }
}

/* ── 富文本图片/视频样式 ── */
.rich-img {
  max-width: 100%;
  max-height: 400px;
  border-radius: 6px;
  margin: 8px 0;
  display: block;
  cursor: zoom-in;
  transition: transform 0.2s;
}
.rich-img:hover {
  transform: scale(1.02);
}
.rich-video {
  max-width: 100%;
  max-height: 400px;
  border-radius: 6px;
  margin: 8px 0;
  display: block;
}

/* ── 填空题输入 ── */
.blank-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.blank-label {
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  min-width: 40px;
}
.blank-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: border-color 0.2s;
}
.blank-input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(59,109,246,0.1);
}

/* ── 移动端禁止访问提示 ── */
.mobile-guard {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 99999;
  background: var(--surface);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 40px;
  text-align: center;
}
.mobile-guard h2 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-1);
}
.mobile-guard p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}
@media (max-width: 768px) {
  .mobile-guard {
    display: flex;
  }
  #app, #admin-app, #exam-root {
    display: none !important;
  }
}

/* ── 认证页（登录 / 注册）统一布局 ── */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8ecf8 100%);
}

.auth-card {
  width: 420px;
  max-width: 92vw;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: 0 8px 32px rgba(59, 109, 246, 0.08);
  overflow: visible;
}

.auth-card .auth-logo {
  text-align: center;
  margin-bottom: 8px;
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.auth-card .auth-subtitle {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 24px;
}

.auth-tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.auth-tab {
  flex: 1;
  padding: 10px 0;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  position: relative;
  transition: color 0.2s;
}

.auth-tab::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 20%;
  right: 20%;
  height: 2px;
  background: transparent;
  border-radius: 1px;
  transition: background 0.2s;
}

.auth-tab.active {
  color: var(--primary);
}

.auth-tab.active::after {
  background: var(--primary);
}

.auth-tab.disabled {
  color: #ccc;
  cursor: not-allowed;
}

.auth-card .form-row {
  margin-bottom: 14px;
}

.auth-card .btn-primary {
  width: 100%;
  margin-top: 8px;
  padding: 10px 16px;
  font-size: 15px;
}

.auth-card .auth-footer {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
}

.auth-card .auth-footer a {
  color: var(--primary);
  cursor: pointer;
}

/* ── 弹窗遮罩层 ── */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.modal-overlay .card {
  max-width: 90vw;
  animation: modal-in 0.2s ease-out;
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(-12px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── 注册页checkbox项目组选中高亮 ── */
.auth-card label:has(input[type="checkbox"]:checked) {
  border-color: var(--primary) !important;
  background: var(--primary-bg) !important;
  color: var(--primary) !important;
}

/* ── 项目组多选标签（注册页用） ── */
.project-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.project-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.project-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.project-chip.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ── 骨架屏加载态 ── */
.skeleton-list {
  display: grid;
  gap: 12px;
  padding: 16px 0;
}

.skeleton-row {
  height: 48px;
  background: linear-gradient(90deg, var(--divider) 25%, #f8fafc 50%, var(--divider) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: skeleton-pulse 1.5s infinite;
}

@keyframes skeleton-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── 表头排序 ── */
.table th.sortable {
  cursor: pointer;
  user-select: none;
  position: relative;
  padding-right: 20px;
}

.table th.sortable::after {
  content: '⇅';
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--muted);
  opacity: 0.5;
}

.table th.sortable.asc::after {
  content: '↑';
  opacity: 1;
  color: var(--primary);
}

.table th.sortable.desc::after {
  content: '↓';
  opacity: 1;
  color: var(--primary);
}

/* ── 统计卡片 ── */
.stat-card {
  background: var(--divider);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}