:root {
  --fg: #1f2328; --muted: #6b7280; --line: #e5e7eb; --bg: #f6f7f9; --card: #fff;
  --accent: #2563eb; --ok: #16a34a; --ok-bg: #e8f7ec; --bad: #dc2626; --bad-bg: #fdecec; --sel: #eef3ff;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.6 -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--fg); background: var(--bg); }
header { position: sticky; top: 0; z-index: 2; background: var(--card); border-bottom: 1px solid var(--line); padding: 10px 16px 8px; }
h1 { margin: 0 0 6px; font-size: 17px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; font-size: 14px; }
.toolbar input[type=number] { width: 80px; }
select, input[type=number], button { font: inherit; padding: 4px 10px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
button { cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.ghost { color: var(--muted); }
button:disabled { opacity: .45; cursor: default; }
.progress { height: 4px; background: var(--line); border-radius: 2px; margin-top: 8px; overflow: hidden; }
#bar { height: 100%; width: 0; background: var(--ok); transition: width .2s; }
#stats { font-size: 13px; color: var(--muted); margin-top: 4px; }

main { max-width: 860px; margin: 0 auto; padding: 16px; }
#card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px 22px; }
.qhead { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 8px; }
.qhead h2 { margin: 0; font-size: 16px; }
.tag { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 10px; padding: 0 8px; margin-left: 6px; font-weight: normal; }
.star { border: none; font-size: 20px; color: #d1d5db; padding: 0 4px; background: none; }
.star.on { color: #f59e0b; }
.content p { margin: 6px 0; }
.content ul { margin: 6px 0; padding-left: 22px; }
.content img { max-width: 100%; display: block; margin: 8px 0; border: 1px solid var(--line); border-radius: 4px; }

.options { list-style: none; padding: 0; margin: 14px 0; }
.options li { display: flex; gap: 10px; padding: 9px 12px; margin: 6px 0; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; white-space: pre-line; }
.options li:hover { border-color: var(--accent); }
.options li .lab { font-weight: 600; min-width: 1.4em; }
.options li.sel { background: var(--sel); border-color: var(--accent); }
.options.done li { cursor: default; }
.options.done li.right { background: var(--ok-bg); border-color: var(--ok); }
.options.done li.wrong { background: var(--bad-bg); border-color: var(--bad); }
.actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.hint { color: var(--muted); font-size: 13px; }

.result { margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 12px; }
.verdict { font-weight: 600; }
.verdict.ok { color: var(--ok); } .verdict.bad { color: var(--bad); }
.answer { margin: 6px 0; }
.annotation { background: #fff7e0; border: 1px solid #f5d98b; border-radius: 6px; padding: 4px 10px; margin: 8px 0; font-size: 13px; }
.explanation { background: #f8f9fb; border-radius: 8px; padding: 10px 14px; margin-top: 10px; }
.explanation h3 { margin: 0 0 4px; font-size: 14px; color: var(--muted); }
.empty { color: var(--muted); font-style: italic; }

.pager { display: flex; justify-content: space-between; align-items: center; margin: 14px 0; }
#pos { color: var(--muted); font-size: 14px; }
details summary { cursor: pointer; color: var(--muted); margin-bottom: 8px; }
#grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 5px; }
#grid button { padding: 3px 0; font-size: 12px; }
#grid .ok { background: var(--ok-bg); border-color: var(--ok); }
#grid .bad { background: var(--bad-bg); border-color: var(--bad); }
#grid .cur { outline: 2px solid var(--accent); }
#grid .noted { border-style: dashed; font-weight: 600; }

/* ---------- 同步码 ---------- */
.sep { width: 1px; height: 18px; background: var(--line); }
#synccode { width: 190px; font-size: 13px; }
.sync { font-size: 12px; color: var(--muted); }
.sync.ok { color: var(--ok); }
.sync.err { color: var(--bad); }

/* ---------- 统计面板 ---------- */
details { margin-top: 14px; }
#stats-panel, #wrongbook, #topics-panel { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.stat-card { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: #fbfbfd; }
.stat-label { font-size: 12px; color: var(--muted); }
.stat-value { font-size: 22px; font-weight: 600; line-height: 1.25; }
.stat-sub { font-size: 12px; color: var(--muted); }
.stat-table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 13px; }
.stat-table th, .stat-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.stat-table th { color: var(--muted); font-weight: 500; }

/* ---------- 错题本 ---------- */
.wb-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.wb-row:last-child { border-bottom: none; }
.wb-num { flex: none; font-weight: 600; color: var(--accent); background: var(--sel); border-color: var(--accent); }
.wb-body { flex: 1; min-width: 0; }
.wb-stem { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.wb-meta { font-size: 12px; color: var(--muted); }
.wb-badges { flex: none; font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 10px; padding: 1px 8px; }

/* ---------- 卡片内笔记 ---------- */
/* 答题历史 */
.qhist { margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 10px; }
.qhist-head { display: flex; gap: 10px; align-items: baseline; margin-bottom: 4px; }
.qhist-list { margin: 0; padding: 0; list-style: none; font-size: 13px; color: var(--muted); max-height: 160px; overflow-y: auto; }
.qhist-list li { display: flex; gap: 8px; align-items: baseline; padding: 1px 0; }
.hs-v { flex: none; font-weight: 700; width: 1em; text-align: center; }
.hs-v.ok { color: var(--ok); } .hs-v.bad { color: var(--bad); }
.hs-filters { display: flex; gap: 12px; align-items: center; margin: 14px 0 4px; font-size: 13px; }
.hs-day { font-size: 12px; color: var(--muted); font-weight: 600; margin-top: 12px; padding-bottom: 2px; border-bottom: 1px solid var(--line); }

/* ---------- 知识点 ---------- */
.tp-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.tp-msg { font-size: 13px; color: var(--accent); }
.tp-domain { margin-top: 16px; }
.tp-domain-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; padding-bottom: 4px; border-bottom: 1px solid var(--line); font-size: 14px; }
.tp-task { margin-top: 6px; border: 1px solid transparent; border-radius: 8px; }
.tp-task[open] { border-color: var(--line); background: #fbfbfd; }
.tp-task.weak > summary::before { content: "薄弱 "; color: var(--bad); font-size: 12px; font-weight: 600; }
.tp-task > summary { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; padding: 6px 8px; cursor: pointer; font-size: 14px; }
.tp-task > summary:hover { color: var(--accent); }
.tp-id { flex: none; font-weight: 600; color: var(--accent); background: var(--sel); border-radius: 6px; padding: 0 6px; font-size: 13px; }
.tp-name { font-weight: 600; }
.tp-stat { font-size: 12px; color: var(--muted); }
.tp-badge { font-size: 12px; color: var(--ok); border: 1px solid var(--ok); border-radius: 10px; padding: 0 8px; }
.tp-body { padding: 4px 12px 12px; }
.tp-obj { font-size: 12px; color: var(--muted); margin: 6px 0 10px; }
.tp-summary-box { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: var(--card); margin-bottom: 10px; }
.tp-summary-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.tp-summary { font-size: 14px; }
.tp-summary p { margin: 6px 0; }
.tp-docs { margin: 10px 0; font-size: 13px; }
.tp-docs ul { margin: 4px 0 0; padding-left: 22px; }
.tp-docs li { margin: 2px 0; }
.tp-docs a { color: var(--accent); }
.tp-wrong { margin-top: 10px; font-size: 13px; }
.tp-mini { flex: none; font-size: 12px; color: var(--muted); background: none; border-color: var(--line); border-radius: 10px; padding: 1px 8px; }
.tp-mini:hover { color: var(--accent); }
/* 题卡内的知识点条 */
.qtopic { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 14px; padding-top: 10px; border-top: 1px dashed var(--line); font-size: 13px; }
.tp-chip { font-weight: 600; color: var(--accent); background: var(--sel); border-radius: 6px; padding: 1px 8px; }
.tp-svc { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 10px; padding: 0 8px; }
.notes { margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 12px; }
.notes-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.note-tags, .note-content { width: 100%; font: inherit; border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; margin-bottom: 6px; resize: vertical; }
.note-tags:focus, .note-content:focus { outline: none; border-color: var(--accent); }
.notes-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spacer { flex: 1; }
.note-status { font-size: 12px; color: var(--muted); }
.note-status.ok { color: var(--ok); }

/* ---------- AI 讨论抽屉 ---------- */
.hidden { display: none !important; }
.drawer-open { overflow: hidden; }
.cd-mask { position: fixed; inset: 0; background: rgba(15, 23, 42, .28); z-index: 30; }
.cd { position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 100%); background: var(--card); border-left: 1px solid var(--line); z-index: 31; display: flex; flex-direction: column; }
.cd.full { width: 100% !important; }
.cd-resize { position: absolute; left: -3px; top: 0; bottom: 0; width: 7px; cursor: col-resize; z-index: 2; }
.cd-resize::after { content: ""; position: absolute; left: 2px; top: 50%; transform: translateY(-50%); width: 3px; height: 40px; border-radius: 2px; background: var(--line); }
.cd-resize:hover::after { background: var(--accent); }
.cd.full .cd-resize { display: none; }
body.cd-resizing { cursor: col-resize; user-select: none; }
.cd-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.cd-head-actions { display: flex; gap: 6px; }
.cd-head-actions button { padding: 3px 9px; font-size: 13px; }
.cd-chats { display: flex; gap: 6px; overflow-x: auto; padding: 8px 14px; border-bottom: 1px solid var(--line); }
.cd-chats:empty { display: none; }
.chip { flex: none; font-size: 12px; padding: 3px 10px; border-radius: 12px; }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.cd-msgs { flex: 1; overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 92%; border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; }
.bubble.user { align-self: flex-end; background: var(--sel); border-color: #c7d5ff; }
.bubble.assistant { align-self: flex-start; background: #f8f9fb; }
.bubble-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 3px; }
.bubble-role { font-size: 11px; color: var(--muted); }
.bubble-acts { display: flex; gap: 4px; opacity: 0; transition: opacity .15s; }
.bubble:hover .bubble-acts, .bubble-acts:focus-within { opacity: 1; }
.act { font-size: 11px; line-height: 1.6; padding: 0 6px; border-radius: 5px; color: var(--muted); background: #fff; }
.act:hover { color: var(--accent); }
.bubble-body { word-break: break-word; font-size: 14px; }
.bubble.user .bubble-body { white-space: pre-wrap; }
.bubble-err { color: var(--bad); font-size: 13px; margin-top: 6px; }
.bubble.streaming .bubble-body::after { content: "▋"; color: var(--muted); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.cd-summary { margin: 0 14px 10px; border: 1px solid #f5d98b; background: #fffaf0; border-radius: 10px; padding: 10px 12px; max-height: 34vh; overflow-y: auto; }
.cd-summary.err { border-color: var(--bad); background: var(--bad-bg); }
.cd-summary-head { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.cd-summary-body { font-size: 13.5px; }
.cd-compose { display: flex; gap: 8px; padding: 12px 14px; border-top: 1px solid var(--line); }
.cd-compose textarea { flex: 1; font: inherit; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; resize: none; }
.cd-compose textarea:focus { outline: none; border-color: var(--accent); }
.cd-compose button { align-self: flex-end; }
.empty.err { color: var(--bad); font-style: normal; }
@media (max-width: 620px) {
  .wb-badges { display: none; }
  #synccode { width: 140px; }
  .cd-resize { display: none; }
  .bubble-acts { opacity: 1; }
}

/* ---------- Markdown 渲染内容（.md）---------- */
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md p { margin: 6px 0; }
.md h1, .md h2, .md h3, .md h4 { margin: 13px 0 6px; line-height: 1.4; font-size: 15px; }
.md h1 { font-size: 17px; }
.md h2 { font-size: 16px; }
.md h3, .md h4 { font-size: 14.5px; color: #374151; }
.md ul, .md ol { margin: 6px 0; padding-left: 20px; }
.md li { margin: 3px 0; }
.md li > ul, .md li > ol { margin: 2px 0; }
.md strong { font-weight: 600; }
.md code { background: #eceff4; border-radius: 4px; padding: 1px 5px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; }
.md pre { background: #f1f3f7; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin: 8px 0; overflow-x: auto; }
.md pre code { background: none; padding: 0; font-size: 12.5px; line-height: 1.55; }
.md table { border-collapse: collapse; margin: 8px 0; font-size: 13px; display: block; width: max-content; max-width: 100%; overflow-x: auto; }
.md th, .md td { border: 1px solid var(--line); padding: 5px 9px; text-align: left; vertical-align: top; }
.md th { background: #eef1f6; font-weight: 600; white-space: nowrap; }
.md tbody tr:nth-child(even) { background: #fafbfd; }
.md blockquote { margin: 8px 0; padding: 2px 12px; border-left: 3px solid var(--line); color: var(--muted); }
.md a { color: var(--accent); word-break: break-all; }
.md hr { border: none; border-top: 1px solid var(--line); margin: 12px 0; }
.md img { max-width: 100%; border-radius: 6px; }
.katex-display { margin: 8px 0; overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.katex { font-size: 1.02em; }

/* ---------- 顶部：登录身份 + 剩余额度 ---------- */
.userbox { display: flex; align-items: center; gap: 10px; margin-left: auto; flex-wrap: wrap; }
.userbox .who { font-size: 12.5px; background: var(--sel); border: 1px solid #c7d5ff; border-radius: 12px; padding: 1px 10px; max-width: 230px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.userbox .quota { font-size: 12px; color: var(--muted); }
.userbox .quota.ok { color: var(--ok); }
.userbox .quota.warn { color: #b45309; font-weight: 600; }
button.tiny { padding: 2px 8px; font-size: 12px; }

/* ---------- 管理员用量统计 ---------- */
.admin-h { margin: 16px 0 2px; font-size: 13px; color: var(--muted); font-weight: 600; }
.admin-actions { margin-top: 12px; }
#admin-panel .hint { margin: 12px 0 0; }

/* ---------- 登录页 ---------- */
body.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(180deg, #f6f7f9 0%, #eef2f9 100%); }
.login-wrap { width: 100%; max-width: 420px; padding: 20px; }
.login-card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 26px 24px; box-shadow: 0 10px 30px rgba(15, 23, 42, .07); display: flex; flex-direction: column; gap: 12px; }
.login-card h1 { margin: 0; font-size: 19px; }
.login-sub { margin: 0 0 4px; font-size: 13px; color: var(--muted); }
.login-field { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); }
.login-field input { font: inherit; color: var(--fg); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; background: #fff; }
.login-field input:focus { outline: none; border-color: var(--accent); }
.login-btn { margin-top: 6px; padding: 9px 12px; font-size: 15px; }
.login-msg { min-height: 18px; font-size: 13px; color: var(--muted); }
.login-msg.err { color: var(--bad); }
.login-foot { margin: 2px 0 0; font-size: 12px; color: var(--muted); line-height: 1.5; }
@media (max-width: 620px) {
  .userbox { margin-left: 0; }
  .userbox .who { max-width: 150px; }
}

/* ═══════════════════════════════════════════════════════════════
   题匠 · 多题库新增样式
   ═══════════════════════════════════════════════════════════════ */

.hidden { display: none !important; }
a { color: var(--accent); }
a.ghost, a.ghost.tiny {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 12px;
  display: inline-block;
}
a.ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 页面级提示 ---------- */
.page-msg { max-width: 720px; margin: 80px auto; padding: 0 20px; color: var(--muted); text-align: center; }
.page-msg.err { color: var(--bad); }
.notice { border-radius: 8px; padding: 8px 12px; margin-bottom: 12px; font-size: 13px; background: var(--sel); border: 1px solid #c7d5ff; }
.notice.err { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); }

/* ---------- 只读 / 分享横幅 ---------- */
.ro-banner {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 16px; font-size: 13px;
  background: #fffaf0; border-bottom: 1px solid #f5d98b; color: #92400e;
}
.ro-banner a { color: #92400e; }
.back-link { margin-right: 4px; }

/* ---------- 我的题库列表 ---------- */
.list-wrap { max-width: 780px; margin: 0 auto; padding: 28px 20px 60px; }
.list-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.list-head h1 { margin: 0 0 4px; font-size: 22px; }
.list-head-actions { display: flex; align-items: center; gap: 10px; font-size: 12.5px; flex-wrap: wrap; }
.list-head-actions button { margin-left: 6px; }
.list-create {
  display: inline-block; padding: 7px 14px; border-radius: 9px; font-size: 14px;
  background: var(--accent); color: #fff; text-decoration: none; white-space: nowrap;
}
.list-create:hover { filter: brightness(1.06); }
.list-create.small { padding: 4px 12px; font-size: 13px; border-radius: 7px; }

/* 题库卡片：改名 / 分享 / 删除 */
.bank-card { align-items: flex-start; }
.bank-rename-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.bank-rename {
  font: inherit; font-size: 15px; font-weight: 600; color: var(--fg);
  border: 1px solid var(--accent); border-radius: 8px; padding: 5px 9px; background: #fff; min-width: 220px;
}
.bank-rename:focus { outline: none; }
button.danger, a.danger { color: var(--bad); }
button.danger:hover { border-color: var(--bad); }
.share-row {
  flex-basis: 100%; display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line);
}
.share-url {
  font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--accent); background: var(--sel); border-radius: 6px; padding: 3px 8px;
  max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.share-opt { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; color: var(--muted); cursor: pointer; }
.share-opt input { margin: 0; }

/* 分享者隐藏答案时的提示 */
.answer.hidden-answer { background: #f8f9fb; border: 1px dashed var(--line); border-radius: 8px; padding: 8px 12px; }
.answer.hidden-answer .hint { margin-left: 6px; }
.list-h { font-size: 14px; color: var(--muted); margin: 22px 0 8px; }
.list-h-row { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.bank-card {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 16px; margin-bottom: 8px; flex-wrap: wrap;
}
.bank-card-title { font-weight: 600; font-size: 15px; text-decoration: none; }
.bank-card-meta { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.bank-card-src { font-size: 12px; color: var(--muted); margin-top: 2px; }
.bank-card-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.empty-box { background: var(--card); border: 1px dashed var(--line); border-radius: 10px; padding: 22px; text-align: center; color: var(--muted); }
.empty-box p { margin: 4px 0; }
.list-foot { margin-top: 36px; padding-top: 14px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 13px; }

/* ---------- 模型设置（BYOK）---------- */
.ai-dialog {
  position: fixed; z-index: 41;
  left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: min(520px, calc(100vw - 32px));
  max-height: calc(100vh - 48px); overflow-y: auto;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 22px 24px; box-shadow: 0 18px 50px rgba(15, 23, 42, .18);
}
.ai-dialog h2 { margin: 0 0 6px; font-size: 17px; }
.ai-dialog .hint { display: block; margin: 0 0 14px; line-height: 1.6; }
.ai-field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.ai-field input { font: inherit; color: var(--fg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; background: #fff; }
.ai-field input:focus { outline: none; border-color: var(--accent); }
.ai-presets { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin: 4px 0 14px; }
.ai-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 8px; }
.ai-msg { min-height: 18px; font-size: 13px; color: var(--muted); margin-top: 8px; }
.ai-msg.ok { color: var(--ok); }
.ai-msg.err { color: var(--bad); }
#cd-ai { font-size: 13px; }

/* ---------- 登录页：登录 / 注册切换 ---------- */
.login-tabs { display: flex; gap: 6px; margin: 2px 0 6px; }
.login-tabs button {
  flex: 1; padding: 7px 10px; font: inherit; font-size: 14px;
  background: #f8f9fb; border: 1px solid var(--line); color: var(--muted); border-radius: 8px; cursor: pointer;
}
.login-tabs button.on { background: var(--sel); border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ═══════════════════════════════════════════════════════════════
   落地页
   ═══════════════════════════════════════════════════════════════ */
body.landing { background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%); }
.lp-nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px; background: rgba(255, 255, 255, .86); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.lp-logo { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--fg); letter-spacing: .04em; }
.lp-nav-actions { display: flex; gap: 16px; font-size: 14px; }
.lp-nav-actions a { text-decoration: none; }

.lp { max-width: 880px; margin: 0 auto; padding: 0 24px 60px; }
.lp-hero { padding: 60px 0 40px; }
.lp-hero h1 { font-size: 34px; line-height: 1.35; margin: 0 0 16px; letter-spacing: -.01em; }
.lp-sub { font-size: 16px; line-height: 1.75; color: #374151; max-width: 640px; margin: 0 0 24px; }
.lp-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.lp-btn {
  display: inline-block; padding: 10px 18px; border-radius: 9px; text-decoration: none;
  border: 1px solid var(--line); background: #fff; color: var(--fg); font-size: 15px;
}
.lp-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.lp-btn:hover { border-color: var(--accent); }
.lp-note { font-size: 13px; color: var(--muted); }

.lp-three { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin: 24px 0 44px; }
.lp-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 18px 16px; }
.lp-card h3 { margin: 8px 0 6px; font-size: 16px; }
.lp-card p { margin: 0; font-size: 13.5px; line-height: 1.7; color: #4b5563; }
.lp-step {
  width: 26px; height: 26px; border-radius: 50%; background: var(--sel); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700;
}

.lp h2 { font-size: 20px; margin: 40px 0 14px; }
.lp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.lp-feat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; position: relative; }
.lp-feat h4 { margin: 0 0 6px; font-size: 15px; }
.lp-feat p { margin: 0; font-size: 13.5px; line-height: 1.7; color: #4b5563; }
.lp-tag { position: absolute; top: 14px; right: 14px; font-size: 11px; color: var(--accent); border: 1px solid var(--accent); border-radius: 10px; padding: 0 8px; }

.lp-cost p { font-size: 14.5px; line-height: 1.8; color: #374151; }
.lp-hint { font-size: 13px !important; color: var(--muted) !important; }

.lp-faq details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin-bottom: 8px; }
.lp-faq summary { display: block; cursor: pointer; font-size: 14.5px; font-weight: 600; color: var(--fg); }
.lp-faq p { font-size: 13.5px; line-height: 1.75; color: #4b5563; margin: 8px 0 0; }
.lp-faq code { background: #eceff4; border-radius: 4px; padding: 1px 5px; font-size: 12.5px; }

.lp-foot { margin-top: 48px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.lp-foot p { margin: 3px 0; }

@media (max-width: 620px) {
  .lp-hero h1 { font-size: 26px; }
  .lp { padding: 0 18px 40px; }
}

/* ═══════════════════════════════════════════════════════════════
   导入向导（P1）
   ═══════════════════════════════════════════════════════════════ */

.import-body { background: var(--bg); }
.imp-head {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
}
.imp-head-title { font-size: 15px; }
.imp-head .spacer { flex: 1; }

.imp-steps { display: flex; gap: 8px; max-width: 1080px; margin: 16px auto 0; padding: 0 16px; flex-wrap: wrap; }
.imp-step { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.imp-step i {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; border-radius: 50%; font-style: normal; font-size: 12px;
  background: #eef1f6; color: var(--muted);
}
.imp-step.on { color: var(--accent); font-weight: 600; }
.imp-step.on i { background: var(--accent); color: #fff; }
.imp-step.done i { background: var(--ok); color: #fff; }

.imp-main { max-width: 1080px; margin: 0 auto; padding: 14px 16px 60px; }
.imp-panel { margin-top: 8px; }
.imp-card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 14px; }
.imp-summary { margin: 0 0 8px; font-size: 14px; }
.imp-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.imp-actions .hint.ok { color: var(--ok); }
.imp-actions .hint.err { color: var(--bad); }

/* 上传区 */
.dropzone {
  background: var(--card); border: 2px dashed var(--line); border-radius: 12px;
  padding: 34px 20px; text-align: center; transition: border-color .15s, background .15s;
}
.dropzone.over { border-color: var(--accent); background: var(--sel); }
.dropzone.disabled { opacity: .5; pointer-events: none; }
.dz-title { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.dz-hint { margin: 0 0 14px; font-size: 13px; color: var(--muted); }
.dz-actions { display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; }

.imp-field { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.imp-field > input, .imp-field > textarea, .imp-field > select {
  font: inherit; color: var(--fg); border: 1px solid var(--line); border-radius: 8px;
  padding: 8px 10px; background: #fff; width: 100%;
}
.imp-field > textarea { resize: vertical; line-height: 1.6; }
.imp-field > input:focus, .imp-field > textarea:focus, .imp-field > select:focus { outline: none; border-color: var(--accent); }

.imp-progress { height: 5px; background: var(--line); border-radius: 3px; overflow: hidden; margin: 14px 0 0; }
.imp-progress > div { height: 100%; width: 0; background: var(--accent); transition: width .25s; }

.imp-info { margin-top: 14px; }
.imp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; }
.imp-cell { background: #fbfbfd; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.imp-cell-l { display: block; font-size: 12px; color: var(--muted); margin-bottom: 2px; }

.imp-warn { background: #fffaf0; border: 1px solid #f5d98b; border-radius: 8px; padding: 8px 12px; margin: 8px 0 0; font-size: 13px; color: #92400e; }
.imp-err { background: var(--bad-bg); border: 1px solid var(--bad); border-radius: 8px; padding: 10px 12px; margin: 0; font-size: 14px; color: var(--bad); font-weight: 600; }
.imp-check { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; line-height: 1.6; margin: 10px 0; cursor: pointer; }
.imp-draft { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; background: var(--sel); border: 1px solid #c7d5ff; border-radius: 10px; padding: 10px 14px; margin-bottom: 14px; font-size: 13px; }
.imp-draft .spacer { flex: 1; }

/* 分块列表 */
.chunk-list { display: flex; flex-direction: column; gap: 6px; }
.chunk-row {
  display: flex; align-items: center; gap: 10px;
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px;
}
.chunk-row.failed { border-color: var(--bad); background: #fffafa; }
.chunk-row.ok { border-color: #cbe8d3; }
.chunk-id { flex: none; font-size: 12px; font-weight: 600; color: var(--muted); min-width: 30px; }
.chunk-body { flex: 1; min-width: 0; }
.chunk-meta { font-size: 12.5px; color: var(--muted); }
.chunk-err { font-size: 12.5px; color: var(--bad); margin-top: 2px; }
.chunk-note { font-size: 12.5px; color: #92400e; margin-top: 2px; }
.chunk-status { flex: none; font-size: 12.5px; color: var(--muted); }
.chunk-row.ok .chunk-status { color: var(--ok); }
.chunk-row.failed .chunk-status { color: var(--bad); }

/* 校对 */
.rv-bar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; position: sticky; top: 44px; z-index: 3;
}
.rv-bar .spacer { flex: 1; }
.rv-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; margin-top: 12px; }
.rv-left, .rv-right { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; min-width: 0; }
.rv-left-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; padding-bottom: 8px; border-bottom: 1px solid var(--line); margin-bottom: 8px; }
.rv-src {
  margin: 0; max-height: 62vh; overflow: auto; white-space: pre-wrap; word-break: break-word;
  font: 12.5px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: #374151;
}
.rv-line { display: block; }
.rv-line.hl { background: #fff6d6; outline: 2px solid #f5d98b; border-radius: 3px; }
.rv-right { max-height: 74vh; overflow-y: auto; }
.rv-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.rv-flag { background: #fffaf0; border: 1px solid #f5d98b; border-radius: 8px; padding: 8px 10px; font-size: 12.5px; color: #92400e; line-height: 1.7; }
.rv-opt { display: grid; grid-template-columns: 34px minmax(0, 1fr) 28px; gap: 6px; align-items: start; margin-bottom: 6px; }
.rv-opt-label { font: inherit; text-align: center; border: 1px solid var(--line); border-radius: 6px; padding: 7px 4px; background: #fff; color: var(--fg); }
.rv-opt-text { font: inherit; border: 1px solid var(--line); border-radius: 6px; padding: 7px 9px; background: #fff; color: var(--fg); resize: vertical; line-height: 1.55; }
.rv-opt-label:focus, .rv-opt-text:focus { outline: none; border-color: var(--accent); }
.rv-answers { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.rv-ans-chip {
  min-width: 34px; padding: 6px 10px; font: inherit; font-size: 13px;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--fg); cursor: pointer;
}
.rv-ans-chip.on { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.rv-ans-free { flex: 1; min-width: 160px; font: inherit; border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; }
.rv-ans-free:focus { outline: none; border-color: var(--accent); }

/* 保存日志 */
.save-log { margin-top: 12px; font: 12.5px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--muted); max-height: 40vh; overflow-y: auto; }
.save-log-row { padding: 1px 0; }
.save-log-row.ok { color: var(--ok); }
.save-log-row.err { color: var(--bad); }

@media (max-width: 780px) {
  .rv-split { grid-template-columns: minmax(0, 1fr); }
  .rv-src { max-height: 30vh; }
  .rv-right { max-height: none; }
  .rv-bar { position: static; }
}

/* ═══════════════════════════════════════════════════════════════
   移动端：手机打开刷题要能用（P2）
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 720px) {
  /* 顶部工具栏在窄屏会占掉半屏，改成横向可滚动的单行 */
  .toolbar {
    flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px;
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
  }
  .toolbar::-webkit-scrollbar { display: none; }
  .toolbar > * { flex: none; }
  .toolbar .userbox { margin-left: 0; }
  .toolbar .userbox .who { max-width: 120px; }
  header { padding: 8px 12px 6px; }
  h1 { font-size: 16px; }
  main { padding: 12px; }
  #card { padding: 14px 14px; border-radius: 10px; }
  .options li { padding: 10px 12px; }
  .pager { margin: 10px 0; }
  #grid { grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); }
  .ro-banner { flex-wrap: wrap; font-size: 12.5px; padding: 6px 12px; }
  .ro-banner .spacer { display: none; }
  .bank-card { padding: 12px 12px; }
  .bank-card-actions { width: 100%; justify-content: flex-start; }
  .bank-rename { min-width: 0; width: 100%; }
  .share-url { flex: 1 1 100%; }
  .list-wrap { padding: 18px 12px 48px; }
  .list-head h1 { font-size: 19px; }
  .landing .lp-hero { padding: 34px 0 24px; }
}

/* 触屏上别用 hover 才出现的东西（AI 气泡的操作按钮一直是可见的，这里只是兜底） */
@media (hover: none) {
  .bubble-acts { opacity: 1; }
}