/* ============================================================
   专升本题库系统 · 云端版
   视觉风格参考 SJEP 解题策（青绿主色 / 胶囊标签 / 渐变网格 / 圆角卡片）
   类名与旧版完全兼容，app.js 无需改动
   ============================================================ */
:root {
  --bg: #f4f9f8; --card: #ffffff; --text: #1f2937; --muted: #8ba09c;
  --primary: #2DBFAF; --primary-dark: #23a394; --primary-deep: #14897c;
  --primary-soft: rgba(45, 191, 175, .10); --primary-border: rgba(45, 191, 175, .35);
  --accent: #26b3a3; --accent-soft: #e6f7f5;
  --coral: #FF6B81; --coral-deep: #e85067; --coral-soft: #fff0f2;
  --indigo: #5b6cf0; --indigo-soft: #eef0ff; --indigo-border: #d4d9ff;
  --gold: #e8a50c; --gold-soft: #fdf6e6;
  --border: #e5efee; --hover: #eafaf8;
  --success: #2ecc8f; --warning: #f5b50a; --danger: #ff4d6d;
  --shadow: 0 6px 24px rgba(31, 73, 68, .08);
  --shadow-lg: 0 18px 50px rgba(31, 73, 68, .14);
  --radius: 14px; --radius-sm: 10px;
  --header-h: 60px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
::selection { background: rgba(45, 191, 175, .22); }
html { scrollbar-color: #c9e4df transparent; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text); line-height: 1.6; min-height: 100vh;
  background-color: #f4f9f8;
  background-image:
    linear-gradient(rgba(45, 191, 175, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 191, 175, .05) 1px, transparent 1px),
    radial-gradient(1100px 480px at 12% -6%, rgba(45, 191, 175, .10), transparent 55%),
    radial-gradient(900px 420px at 92% -4%, rgba(255, 107, 129, .07), transparent 52%),
    linear-gradient(180deg, #f9fdfc, #f1f8f6);
  background-size: 34px 34px, 34px 34px, auto, auto, auto;
  background-attachment: fixed;
}

/* ============================ 顶部导航（sjep 风格） ============================ */
.app-header {
  background: rgba(255, 255, 255, .9); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 22px; height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 18px rgba(31, 73, 68, .07);
}
.app-header .brand { display: flex; align-items: center; gap: 6px; min-width: 0; }
.app-header h1 { font-size: 1.16em; font-weight: 700; color: var(--text); white-space: nowrap; letter-spacing: .2px; }
.app-header .ver {
  font-size: .68em; font-weight: 600; margin-left: 8px; color: var(--primary-deep);
  background: var(--primary-soft); border: 1px solid var(--primary-border);
  padding: 2px 10px; border-radius: 999px; vertical-align: 2px; letter-spacing: .5px;
}
.header-right { display: flex; align-items: center; gap: 8px; flex-wrap: nowrap; }
.header-right select {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border);
  background: #fff; color: var(--text); font-size: .88em; cursor: pointer; min-width: 190px;
  outline: none; box-shadow: 0 1px 4px rgba(31, 73, 68, .05);
}
.header-right select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.header-right select option { background: #fff; color: var(--text); }

.btn-newbank, .btn-share {
  padding: 7px 14px; background: var(--primary-soft); color: var(--primary-deep);
  border: 1px solid var(--primary-border); border-radius: 999px;
  font-size: .86em; cursor: pointer; white-space: nowrap; font-weight: 500;
  transition: all .18s;
}
.btn-newbank:hover, .btn-share:hover { background: rgba(45, 191, 175, .18); transform: translateY(-1px); }
.btn-new {
  padding: 7px 16px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff;
  border: none; border-radius: 999px; font-size: .88em; font-weight: 600; cursor: pointer;
  white-space: nowrap; box-shadow: 0 4px 12px rgba(45, 191, 175, .30); transition: all .18s;
}
.btn-new:hover { background: linear-gradient(135deg, #26b3a3, #1f9689); transform: translateY(-1px); }
.btn-check {
  padding: 7px 14px; background: var(--indigo-soft); color: var(--indigo);
  border: 1px solid var(--indigo-border); border-radius: 999px;
  font-size: .86em; cursor: pointer; white-space: nowrap; font-weight: 500; transition: all .18s;
}
.btn-check:hover { background: #e2e6ff; transform: translateY(-1px); }
.btn-smart {
  padding: 7px 14px; background: var(--coral-soft); color: var(--coral-deep);
  border: 1px solid rgba(255, 107, 129, .38); border-radius: 999px;
  font-size: .86em; cursor: pointer; white-space: nowrap; font-weight: 500; transition: all .18s;
}
.btn-smart:hover { background: #ffe3e8; transform: translateY(-1px); }
.basket-btn {
  position: relative; padding: 7px 16px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff;
  border: none; border-radius: 999px; cursor: pointer; font-size: .88em; font-weight: 600;
  white-space: nowrap; box-shadow: 0 4px 12px rgba(45, 191, 175, .28); transition: all .18s;
}
.basket-btn:hover { transform: translateY(-1px); }
.basket-btn .badge {
  display: inline-block; background: #fff; color: var(--primary-deep); border-radius: 999px;
  min-width: 20px; height: 20px; line-height: 20px; text-align: center;
  font-size: .72em; font-weight: 700; margin-left: 5px; padding: 0 5px;
}

/* ============================ 布局 ============================ */
.main-container { display: flex; max-width: 1500px; margin: 18px auto; min-height: calc(100vh - var(--header-h) - 36px); gap: 18px; padding: 0 18px; }
.sidebar {
  width: 276px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 14px; overflow-y: auto; flex-shrink: 0;
  max-height: calc(100vh - var(--header-h) - 40px); position: sticky; top: calc(var(--header-h) + 16px);
  box-shadow: var(--shadow);
}
.sidebar h3 {
  font-size: .78em; color: var(--primary-deep); letter-spacing: 1px;
  margin-bottom: 10px; padding-bottom: 8px; border-bottom: 2px solid var(--primary);
  display: flex; align-items: center; gap: 6px;
}
.content { flex: 1; min-width: 0; padding: 4px 6px 30px; overflow-y: auto; }

/* ============================ 分类树 ============================ */
.tree ul { list-style: none; }
.tree li { margin: 1px 0; }
.cat-item {
  display: flex; align-items: center; gap: 4px; padding: 5px 10px; cursor: pointer;
  border-radius: 999px; font-size: .88em; transition: all .15s; border-left: 3px solid transparent;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.cat-item:hover { background: var(--hover); }
.cat-item.active { background: var(--primary-soft); border-left-color: var(--primary); color: var(--primary-deep); font-weight: 600; }
.cat-item .caret { width: 14px; font-size: .62em; color: var(--muted); flex-shrink: 0; }
.cat-item .cnt {
  margin-left: auto; font-size: .7em; color: #a8bfbb; flex-shrink: 0;
  background: #f2f8f7; border-radius: 999px; padding: 0 7px;
}
.cat-item.cat-expand { font-weight: 600; }
.cat-children.collapsed { display: none; }

/* 拖动题目换组 */
.drag-tip { font-size: .72em; color: #8aa5a0; margin: -4px 0 8px; line-height: 1.4; }
body.dragging-question .cat-item { transition: background .12s, box-shadow .12s; }
.cat-item.drag-over {
  background: #e6f7f4 !important; box-shadow: inset 0 0 0 2px var(--primary);
  border-left-color: var(--primary);
}
.cat-item.drag-over .cat-name::after { content: ' ⬅放这里'; font-size: .72em; color: var(--primary-deep); font-weight: 600; }
.question-item.dragging { opacity: .45; border-style: dashed; }
.drag-hint {
  display: none; position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%);
  background: rgba(15, 62, 56, .94); color: #fff; padding: 9px 20px; border-radius: 999px;
  font-size: .84em; z-index: 400; box-shadow: 0 10px 26px rgba(15, 62, 56, .28); pointer-events: none;
}
.drag-hint.show { display: block; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(16px);
  background: #0d7a5f; color: #fff; padding: 10px 22px; border-radius: 999px;
  font-size: .86em; z-index: 500; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none;
  box-shadow: 0 12px 30px rgba(13, 122, 95, .3);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: #c0392b; }

/* ============================ 筛选 ============================ */
.filters { background: #f7fbfa; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px; }
.filters label { display: block; font-size: .8em; color: var(--muted); margin: 6px 0; }
.filters select {
  display: block; width: 100%; margin-top: 3px; padding: 6px 10px;
  border: 1px solid var(--border); border-radius: 999px; font-size: .86em; background: #fff; outline: none;
}
.filters select:focus { border-color: var(--primary); }
.btn-secondary {
  padding: 6px 16px; background: #fff; color: var(--primary-deep); border: 1px solid var(--primary-border);
  border-radius: 999px; font-size: .84em; cursor: pointer; margin-top: 8px; transition: all .15s; font-weight: 500;
}
.btn-secondary:hover { background: var(--accent-soft); }

/* ============================ 搜索栏 ============================ */
.search-bar { display: flex; gap: 10px; margin-bottom: 12px; }
.search-bar input {
  flex: 1; padding: 10px 18px; border: 1px solid var(--border); border-radius: 999px;
  font-size: .9em; outline: none; background: #fff; box-shadow: 0 1px 4px rgba(31, 73, 68, .04);
}
.search-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.search-bar button {
  padding: 9px 22px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff; border: none;
  border-radius: 999px; font-size: .9em; cursor: pointer; font-weight: 600; transition: all .18s;
  box-shadow: 0 4px 12px rgba(45, 191, 175, .25);
}
.search-bar button:hover { background: linear-gradient(135deg, #26b3a3, #1f9689); transform: translateY(-1px); }
.search-bar button.btn-secondary {
  box-shadow: none; background: #fff; color: var(--primary-deep);
  border: 1px solid var(--primary-border); font-weight: 500;
}
.search-bar button.btn-secondary:hover { background: var(--accent-soft); transform: none; }
.stats-bar {
  font-size: .82em; color: var(--muted); margin-bottom: 12px; display: flex; align-items: center;
  background: rgba(255, 255, 255, .7); border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 16px;
}

/* ============================ 题目列表（卡片） ============================ */
.question-list { display: flex; flex-direction: column; gap: 10px; }
.question-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; transition: all .18s; box-shadow: var(--shadow);
  display: flex; gap: 12px; align-items: flex-start;
}
.question-item:hover { border-color: var(--primary-border); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(31, 73, 68, .10); }
.question-item.selected { border-color: var(--primary); background: #f2fcfb; }
.q-checkbox { flex-shrink: 0; width: 18px; height: 18px; margin-top: 3px; cursor: pointer; accent-color: var(--primary); }
.q-body { flex: 1; min-width: 0; cursor: pointer; }
.q-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 5px; gap: 8px; flex-wrap: wrap; }
.q-id { font-weight: 700; color: var(--primary-deep); font-size: .84em; }
.q-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.q-badge {
  font-size: .7em; padding: 2px 10px; border-radius: 999px; font-weight: 600; white-space: nowrap; letter-spacing: .3px;
}
.q-badge.type { background: var(--indigo-soft); color: var(--indigo); }
.q-badge.cat { background: var(--gold-soft); color: #b07d00; }
.q-badge.diff { background: var(--coral-soft); color: var(--coral-deep); }
.q-badge.src { background: #e7f8f0; color: #1f9d6a; }
.q-text {
  font-size: .98em; color: var(--text); line-height: 1.95;
  overflow-wrap: anywhere;
}
.q-text .katex { font-size: 1.06em; }
.select-all { cursor: pointer; color: var(--primary-deep); font-size: .85em; user-select: none; margin-left: auto; font-weight: 500; }

/* ============================ 试题篮 ============================ */
.basket-panel {
  position: fixed; right: 0; top: var(--header-h); bottom: 0; width: 390px;
  background: var(--card); border-left: 3px solid var(--primary); z-index: 150;
  transform: translateX(100%); transition: transform .25s ease;
  display: flex; flex-direction: column; box-shadow: -6px 0 28px rgba(31, 73, 68, .16);
}
.basket-panel.open { transform: translateX(0); }
.basket-panel-header {
  padding: 13px 18px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  background: linear-gradient(135deg, #eafaf8, #f4fdfb);
}
.basket-panel-header h3 { font-size: .98em; color: var(--primary-deep); }
.basket-actions { display: flex; gap: 6px; }
.basket-actions button {
  padding: 5px 13px; border: 1px solid var(--border); border-radius: 999px;
  cursor: pointer; font-size: .78em; background: #fff; color: var(--muted); transition: all .15s;
}
.basket-actions button:hover { background: var(--hover); color: var(--primary-deep); }
.basket-list { flex: 1; overflow-y: auto; padding: 12px; }
.basket-item {
  display: flex; align-items: center; gap: 8px; padding: 9px 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 7px; font-size: .85em;
  background: #fff; transition: all .15s;
}
.basket-item:hover { border-color: var(--primary-border); }
.basket-item .bi-num { font-weight: 700; color: var(--primary-deep); min-width: 24px; }
.basket-item .bi-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.basket-item .bi-bank { font-size: .72em; color: var(--muted); background: var(--accent-soft); border-radius: 999px; padding: 1px 8px; }
.basket-item .bi-remove { cursor: pointer; color: #c3d4d1; font-size: 1.05em; padding: 0 4px; }
.basket-item .bi-remove:hover { color: var(--danger); }
.basket-empty { text-align: center; padding: 40px 16px; color: #bfcfcc; }
.basket-footer { padding: 14px 18px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; background: #fbfefd; }
.basket-footer input {
  padding: 9px 14px; border: 1px solid var(--border); border-radius: 999px; font-size: .88em; outline: none;
}
.basket-footer input:focus { border-color: var(--primary); }
.paper-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; }
.paper-opts label { display: flex; align-items: center; gap: 5px; font-size: .78em; color: var(--muted); }
.paper-opts select {
  flex: 1; padding: 5px 8px; border: 1px solid var(--border); border-radius: 999px;
  font-size: .82em; background: #fff; outline: none;
}
.paper-opts label input[type="checkbox"] { accent-color: var(--primary); }
.basket-footer button.primary {
  padding: 11px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff; border: none; border-radius: 999px;
  font-size: .95em; cursor: pointer; font-weight: 600; box-shadow: 0 4px 14px rgba(45, 191, 175, .30); transition: all .18s;
}
.basket-footer button.primary:hover { transform: translateY(-1px); }
.basket-footer button.primary:disabled { background: #cfdfdc; cursor: not-allowed; box-shadow: none; }

/* ============================ 智能组卷 ============================ */
.rule-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.rule-row select, .rule-row input {
  padding: 6px 10px; border: 1px solid var(--border); border-radius: 999px; font-size: .85em; background: #fff; outline: none;
}
.rule-row select:focus, .rule-row input:focus { border-color: var(--primary); }
.rule-row .rr-type { flex: 2; }
.rule-row .rr-diff { flex: 2; }
.rule-row .rr-count { width: 70px; }
.rule-row .rr-del { color: var(--danger); cursor: pointer; border: none; background: none; font-size: 1em; }
.smart-actions { display: flex; gap: 8px; margin-top: 12px; }
.smart-actions button {
  flex: 1; padding: 10px; border: none; border-radius: 999px; cursor: pointer; font-size: .9em; font-weight: 600; transition: all .18s;
}
.smart-actions .primary { background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff; box-shadow: 0 4px 12px rgba(45, 191, 175, .25); }
.smart-actions .primary:hover { transform: translateY(-1px); }
.smart-actions .secondary { background: var(--accent-soft); color: var(--primary-deep); border: 1px solid var(--primary-border); }
.smart-actions .secondary:hover { background: #d9f3ef; }

/* ============================ 分享弹窗 ============================ */
.share-form { display: flex; gap: 16px; align-items: center; margin: 10px 0; flex-wrap: wrap; }
.share-form label { font-size: .85em; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.share-form select { padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px; background: #fff; font-size: .9em; outline: none; }
.share-form input[type="checkbox"] { accent-color: var(--primary); }
.share-current {
  background: linear-gradient(135deg, #eefbf5, #f4fdf9); border: 1px solid #b9ecd8; border-radius: var(--radius-sm);
  padding: 13px 15px; margin-top: 10px; display: flex; flex-direction: column; gap: 8px;
}
.share-current p { font-size: .88em; color: #1f9d6a; }
.share-current input {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 999px;
  font-size: .88em; background: #fff; color: var(--primary-deep); outline: none;
}
.share-current .op-btn {
  align-self: flex-start; padding: 5px 16px; border: 1px solid var(--primary); color: var(--primary-deep);
  background: #fff; border-radius: 999px; cursor: pointer; font-weight: 500; transition: all .15s;
}
.share-current .op-btn:hover { background: var(--accent-soft); }

/* ============================ 用户区 / 登录 ============================ */
.user-area { display: flex; align-items: center; gap: 8px; }
.user-name { font-size: .88em; font-weight: 600; color: var(--text); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-role {
  font-size: .68em; padding: 2px 10px; border-radius: 999px; font-weight: 600;
  background: var(--primary-soft); color: var(--primary-deep); border: 1px solid var(--primary-border);
}
.btn-link {
  background: #fff; border: 1px solid var(--border); color: var(--text);
  border-radius: 999px; padding: 4px 12px; font-size: .78em; cursor: pointer; transition: all .15s;
}
.btn-link:hover { background: var(--hover); color: var(--primary-deep); border-color: var(--primary-border); }

.login-modal { max-width: 420px; border-radius: 20px; overflow: hidden; }
.login-modal .modal-header {
  background: linear-gradient(135deg, #2DBFAF, #63d3c2 55%, #8fe0d2);
  border-bottom: none; padding: 26px 26px 20px; text-align: center;
}
.login-modal .modal-header .q-title { color: #fff; font-size: 1.15em; letter-spacing: .5px; }
.login-modal .brand-pill {
  display: inline-block; margin-top: 10px; font-size: .68em; font-weight: 500; color: #fff;
  background: rgba(255, 255, 255, .20); border: 1px solid rgba(255, 255, 255, .55);
  padding: 3px 14px; border-radius: 999px; letter-spacing: 1px;
}
.login-modal .modal-body { padding: 24px 30px 26px; }
.login-modal label { display: block; font-size: .85em; color: var(--muted); margin: 12px 0; }
.login-modal input {
  display: block; width: 100%; margin-top: 4px; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: 999px; font-size: .95em; outline: none;
  background: #fbfefd; transition: all .15s;
}
.login-modal input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); background: #fff; }
.auth-btn {
  width: 100%; margin-top: 12px; padding: 11px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff;
  border: none; border-radius: 999px; font-size: 1em; cursor: pointer; font-weight: 700; letter-spacing: 4px;
  box-shadow: 0 6px 16px rgba(45, 191, 175, .32); transition: all .18s;
}
.auth-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(45, 191, 175, .40); }
.login-alt { text-align: center; font-size: .85em; color: var(--muted); margin-top: 14px; }
.login-alt a { color: var(--primary-deep); cursor: pointer; font-weight: 500; }
.login-msg { margin-top: 10px; font-size: .85em; color: var(--danger); min-height: 1.2em; text-align: center; }

/* ============================ 用户管理 ============================ */
.user-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: .88em; }
.user-table th, .user-table td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.user-table th { background: #f0faf8; color: var(--primary-deep); font-weight: 600; }
.user-table tr:first-child th:first-child { border-top-left-radius: var(--radius-sm); }
.user-table tr:first-child th:last-child { border-top-right-radius: var(--radius-sm); }
.user-table .op-btn {
  padding: 3px 12px; border: 1px solid var(--border); border-radius: 999px;
  background: #fff; cursor: pointer; font-size: .78em; margin-right: 4px; transition: all .15s;
}
.user-table .op-btn:hover { background: var(--hover); }
.user-table .op-btn.danger { color: var(--danger); border-color: rgba(255, 77, 109, .5); }
.user-table .op-btn.danger:hover { background: var(--coral-soft); }
.user-table .op-btn.ok { color: #1f9d6a; border-color: rgba(31, 157, 106, .5); }
.user-table .op-btn.ok:hover { background: #e7f8f0; }
.create-user { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; align-items: center; }
.create-user input, .create-user select {
  padding: 7px 12px; border: 1px solid var(--border); border-radius: 999px; font-size: .88em; outline: none;
}
.create-user input:focus, .create-user select:focus { border-color: var(--primary); }
.create-user .cu-name { width: 120px; }
.create-user .cu-pass { width: 120px; }
.create-user .cu-display { width: 110px; }

/* ============================ 公式（离线渲染器 math.js） ============================ */
.math-inline { font-family: "Cambria Math", "Times New Roman", "STIX Two Math", serif; font-size: 1.05em; white-space: nowrap; }
.math-inline i { font-style: italic; }
.math-inline sub, .math-inline sup { font-size: .7em; line-height: 0; }
.math-inline .mg { display: inline-block; }
.math-inline .mfrac { display: inline-block; vertical-align: middle; text-align: center; margin: 0 2px; }
.math-inline .mnum { display: block; padding: 0 3px 1px; border-bottom: 1px solid currentColor; }
.math-inline .mden { display: block; padding: 1px 3px 0; }
.math-inline .msqrt { display: inline-block; vertical-align: middle; position: relative; margin: 0 1px; }
.math-inline .msqrt .mrootbody { display: inline-block; padding: 1px 3px 0 2px; border-top: 1px solid currentColor; }
.math-inline .mrootidx { position: absolute; top: -0.9em; left: -0.5em; font-size: .65em; }
.math-inline .msym { font-family: "Cambria Math", "Times New Roman", serif; }
.math-inline .mfunc { font-style: normal; }
.math-inline .mrm { font-style: normal; }
.math-inline .munder, .math-inline .mover, .math-inline .moplim {
  display: inline-flex; flex-direction: column; align-items: center;
  vertical-align: middle; line-height: 1.05; margin: 0 1px;
}
.math-inline .munder-sub, .math-inline .mover-sub { font-size: .62em; }
.math-inline .mop { font-style: normal; white-space: nowrap; }
.math-inline .moplim .mover-sub { order: 1; }
.math-inline .moplim .moplim-base { order: 2; }
.math-inline .moplim .munder-sub { order: 3; }

/* ============================ 录题编辑器 ============================ */
.question-editor { max-width: 760px; }
.modal-tabs { display: flex; gap: 6px; background: #f2f8f7; padding: 5px; border-radius: 999px; width: fit-content; }
.tab-btn {
  padding: 5px 16px; border: none; background: transparent; border-radius: 999px;
  cursor: pointer; font-size: .82em; color: var(--muted); transition: all .15s; font-weight: 500;
}
.tab-btn.active { background: #fff; color: var(--primary-deep); box-shadow: 0 2px 8px rgba(31, 73, 68, .10); font-weight: 600; }
.q-form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.q-form-grid label, .q-form-full label { display: block; font-size: .82em; color: var(--muted); }
.q-form-grid input, .q-form-grid select {
  display: block; width: 100%; margin-top: 3px; padding: 7px 12px;
  border: 1px solid var(--border); border-radius: 999px; font-size: .9em; background: #fff; outline: none;
}
.q-form-grid input:focus, .q-form-grid select:focus { border-color: var(--primary); }
.q-form-full { display: block; margin-top: 10px; font-size: .82em; color: var(--muted); }
.q-form-full textarea {
  display: block; width: 100%; margin-top: 3px; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: .92em;
  font-family: inherit; line-height: 1.7; resize: vertical; outline: none; background: #fbfefd;
}
.q-form-full textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.import-hint { font-size: .85em; color: var(--muted); margin-bottom: 6px; }
.import-sample {
  background: #f2f8f7; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 12px; font-size: .78em; line-height: 1.7; color: #5a726e; white-space: pre-wrap; margin-bottom: 10px;
}
.q-form-full textarea#qeBatchText { min-height: 180px; }
.q-ops { display: flex; gap: 6px; margin-left: 10px; }
.danger-text { color: var(--danger) !important; border-color: rgba(255, 77, 109, .5) !important; }

/* ============================ 校对报告 ============================ */
.check-item { display: inline-flex; align-items: center; gap: 5px; margin: 0 12px 8px 0; font-size: .9em; cursor: pointer; }
.check-summary { margin-bottom: 12px; font-size: .88em; }
.chk-sum {
  display: inline-block; background: #f2f8f7; border: 1px solid var(--border); border-radius: 999px;
  padding: 2px 12px; margin: 2px 4px 2px 0; font-size: .82em;
}
.check-list { max-height: 52vh; overflow-y: auto; }
.check-row {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 6px; font-size: .85em;
  background: #fff; transition: all .15s;
}
.check-row:hover { border-color: var(--primary-border); }
.check-row.resolved { opacity: .5; }
.sev { font-size: .7em; padding: 2px 10px; border-radius: 999px; font-weight: 600; flex-shrink: 0; }
.sev-error { background: var(--coral-soft); color: var(--coral-deep); }
.sev-warning { background: var(--gold-soft); color: #b07d00; }
.sev-info { background: var(--indigo-soft); color: var(--indigo); }
.check-row .code { font-weight: 700; color: var(--primary-deep); flex-shrink: 0; min-width: 110px; }
.check-row .msg { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ============================ 分页 ============================ */
.pagination { display: flex; justify-content: center; align-items: center; gap: 10px; margin-top: 20px; padding: 14px 0; }
.pagination button {
  padding: 7px 18px; border: 1px solid var(--border); background: var(--card);
  border-radius: 999px; cursor: pointer; font-size: .85em; transition: all .15s; color: var(--text);
}
.pagination button:hover:not(:disabled) { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-1px); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }
.pagination .page-info { font-size: .85em; color: var(--muted); }

/* ============================ 弹窗 ============================ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(23, 51, 48, .45); backdrop-filter: blur(4px); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal {
  background: var(--card); border-radius: 18px; max-width: 920px; width: 100%;
  max-height: 88vh; overflow-y: auto; box-shadow: var(--shadow-lg);
  border: 1px solid rgba(45, 191, 175, .12);
}
.modal-header {
  padding: 16px 22px 12px; position: sticky; top: 0; background: var(--card);
  border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: flex-start; gap: 10px;
  border-radius: 18px 18px 0 0;
}
.modal-header .q-title { font-size: 1.05em; font-weight: 700; color: var(--text); }
.modal-close {
  background: none; border: none; font-size: 1.4em; cursor: pointer; color: var(--muted); padding: 0 6px;
  border-radius: 50%; transition: all .15s;
}
.modal-close:hover { color: var(--danger); background: var(--coral-soft); }
.modal-body { padding: 18px 22px; }
.modal-section {
  margin-bottom: 16px; padding: 14px 16px; border-radius: var(--radius-sm);
  background: #f7fbfa; border: 1px solid var(--border);
}
.modal-section h4 { font-size: .82em; color: var(--primary-deep); margin-bottom: 8px; letter-spacing: .5px; display: flex; align-items: center; gap: 6px; }
.answer-toggle button {
  padding: 6px 18px; background: linear-gradient(135deg, #2DBFAF, #26a999); color: #fff; border: none;
  border-radius: 999px; cursor: pointer; font-size: .83em; margin-bottom: 8px; transition: all .15s;
}
.answer-toggle button:hover { transform: translateY(-1px); }
.answer-content { padding: 10px 14px; background: #eefbf5; border-radius: var(--radius-sm); border-left: 4px solid var(--success); }
.solution-content { padding: 10px 14px; background: #fdf6e6; border-radius: var(--radius-sm); border-left: 4px solid var(--warning); }
.q-img { text-align: center; margin: 10px 0; }
.q-img img { max-width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.q-img .img-broken { color: #bfcfcc; font-size: .85em; padding: 20px; border: 1px dashed var(--border); border-radius: var(--radius-sm); }

/* ============================ 杂项 ============================ */
.loading { text-align: center; padding: 40px; color: var(--muted); }
.spinner { display: inline-block; width: 28px; height: 28px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.empty { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty .icon { font-size: 3.5em; margin-bottom: 14px; display: block; }
.empty h3 { color: var(--text); margin-bottom: 6px; }
.hint { color: #a8bfbb; font-size: .85em; padding: 8px 4px; }

@media (max-width: 900px) {
  .header-right { flex-wrap: wrap; }
  .app-header { height: auto; padding: 10px 14px; flex-wrap: wrap; }
  .main-container { flex-direction: column; margin: 10px; padding: 0; }
  .sidebar { width: 100%; max-height: none; position: static; }
  .content { padding: 10px 0; }
  .modal { max-height: 95vh; }
}

.header-right .img-on{background:#0d7a5f;color:#fff}


.opt-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px 18px;margin:4px 0}
.opt-grid .opt{min-width:0;overflow-wrap:anywhere}
@media (max-width:640px){.opt-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}


.cat-mgr{max-height:60vh;overflow:auto;border:1px solid #eee;border-radius:8px;padding:6px 8px}
.cat-mgr-list{list-style:none;margin:0;padding-left:14px}
.cat-mgr-list>li{margin:2px 0}
.cat-mgr-row{display:flex;align-items:center;gap:6px;padding:2px 4px;border-radius:6px}
.cat-mgr-row:hover{background:#f5fbf9}
.cat-mgr-name{flex:1;min-width:120px;padding:3px 6px;border:1px solid #e0e0e0;border-radius:5px;font-size:.9em}
.cat-mgr-ops button{margin-left:2px;border:1px solid #ddd;background:#fff;border-radius:5px;cursor:pointer;padding:1px 6px;font-size:.8em}
.cat-mgr-ops button:hover{border-color:#0d7a5f;color:#0d7a5f}