:root{
  --bg:#f4f6fb; --card:#ffffff; --line:#e5e9f2; --text:#1f2937; --muted:#6b7280;
  --brand:#4f46e5; --brand2:#6366f1; --danger:#ef4444; --ok:#10b981;
  --shadow:0 1px 3px rgba(15,23,42,.08),0 4px 16px rgba(15,23,42,.05);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font:14px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:16px;padding:10px 20px;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.brand{font-weight:700;font-size:17px;white-space:nowrap}
.tabs{display:flex;gap:4px;flex:1}
.tab{border:0;background:transparent;padding:8px 14px;border-radius:8px;cursor:pointer;font-size:14px;color:var(--muted)}
.tab:hover{background:#eef0f7}
.tab.active{background:var(--brand);color:#fff;font-weight:600}
.topbar-right{display:flex;align-items:center;gap:10px}
.ghost{border:1px solid var(--line);background:#fff;padding:7px 12px;border-radius:8px;cursor:pointer;color:var(--text)}
.ghost:hover{border-color:var(--brand);color:var(--brand)}
.status{font-size:12px;color:var(--muted)}
.status.ok{color:var(--ok)}
.container{max-width:1080px;margin:0 auto;padding:22px 18px 80px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow);margin-bottom:16px}
.card h2{margin:0 0 12px;font-size:16px}
.card h3{margin:0 0 8px;font-size:14px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:760px){.grid2{grid-template-columns:1fr}.tabs{overflow-x:auto}.brand{display:none}}
textarea,input[type=text],select{width:100%;border:1px solid var(--line);border-radius:8px;padding:9px 11px;font:inherit;color:var(--text);background:#fff}
textarea{min-height:130px;resize:vertical}
textarea:focus,input:focus,select:focus{outline:2px solid #c7d2fe;border-color:var(--brand)}
label{font-size:12px;color:var(--muted);display:block;margin:0 0 4px}
.field{margin-bottom:12px}
.btn{display:inline-flex;align-items:center;gap:6px;border:0;border-radius:8px;padding:9px 16px;cursor:pointer;font:inherit;font-weight:600;background:var(--brand);color:#fff}
.btn:hover{background:var(--brand2)}
.btn.ghost-btn{background:#fff;border:1px solid var(--line);color:var(--text)}
.btn.ghost-btn:hover{border-color:var(--brand);color:var(--brand)}
.btn.sm{padding:5px 10px;font-size:13px}
.btn.green{background:var(--ok)}
.btn.amber{background:#f59e0b}
.btn.red{background:var(--danger)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.badge{display:inline-block;color:#fff;border-radius:6px;padding:1px 8px;font-size:12px;margin:0 2px 2px 0;vertical-align:middle}
.badge.soft{background:#eef2ff;color:var(--brand);font-weight:600}
.chip{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:2px 10px;font-size:12px;color:var(--muted);margin:0 4px 4px 0;background:#fff}
.list-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff;cursor:pointer;transition:.12s}
.list-item:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.li-main{flex:1;min-width:0}
.li-title{font-weight:600;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.li-sub{font-size:12px;color:var(--muted)}
.filterbar{display:flex;gap:10px;align-items:center;margin-bottom:14px;flex-wrap:wrap}
.analysis-kp{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px;cursor:pointer;transition:.12s}
.analysis-kp:hover{border-color:var(--brand)}
.analysis-kp.selected{border-color:var(--brand);background:#eef2ff}
.conf{font-size:12px;color:var(--muted)}
.conf-bar{height:6px;background:#eef0f7;border-radius:3px;overflow:hidden;margin-top:4px}
.conf-fill{height:100%;background:var(--brand);border-radius:3px}
.kv{display:flex;gap:8px;margin-bottom:6px;font-size:13px}
.kv .k{color:var(--muted);min-width:70px}
.q-body{white-space:pre-wrap;font-size:15px;line-height:1.7}
.q-img{max-width:100%;border-radius:10px;border:1px solid var(--line);margin:8px 0}
.meta{font-size:12px;color:var(--muted);margin:6px 0}
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}
.modal{background:#fff;border-radius:16px;max-width:820px;width:100%;max-height:90vh;overflow:auto;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.modal-close{border:0;background:#eef0f7;border-radius:8px;width:32px;height:32px;cursor:pointer;font-size:16px}
.hidden{display:none!important}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 18px;border-radius:10px;z-index:200;font-size:14px;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.link{color:var(--brand);text-decoration:none}
.link:hover{text-decoration:underline}
.review-item{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px}
.review-item .t{font-weight:600;font-size:13px}
.review-item .d{font-size:12px;color:var(--muted);margin-top:2px}
.practice-card{max-width:760px;margin:0 auto}
.opt-row{display:flex;gap:8px;flex-wrap:wrap}
.empty{text-align:center;color:var(--muted);padding:40px 10px}
.spin{display:inline-block;width:14px;height:14px;border:2px solid #c7d2fe;border-top-color:var(--brand);border-radius:50%;animation:sp .7s linear infinite;vertical-align:-2px}
@keyframes sp{to{transform:rotate(360deg)}}
section{margin-top:16px}
section>.sec-title{font-weight:700;font-size:15px;margin-bottom:8px;border-left:3px solid var(--brand);padding-left:8px}


/* ---------- upload dropzone / preview ---------- */
.dropzone{border:2px dashed var(--line);border-radius:12px;padding:20px;text-align:center;cursor:pointer;transition:.15s;background:#fafbff}
.dropzone:hover{border-color:var(--brand);background:#f5f7ff}
.dropzone.drag{border-color:var(--brand);background:#eef2ff;box-shadow:0 0 0 3px #c7d2fe inset}
.dz-icon{font-size:26px;margin-bottom:6px}
.dz-text{font-size:14px;color:var(--text)}
.dz-link{color:var(--brand);font-weight:600;text-decoration:underline}
.dz-hint{font-size:12px;color:var(--muted);margin-top:4px}
.preview{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;align-items:flex-start}
.thumb{position:relative;width:92px;height:92px;border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#fff}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb-x{position:absolute;top:2px;right:2px;width:20px;height:20px;line-height:18px;text-align:center;border-radius:50%;background:rgba(15,23,42,.7);color:#fff;font-size:14px;cursor:pointer;border:0}
.thumb-x:hover{background:var(--danger)}
.filechip{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;padding:4px 10px;font-size:12px;background:#fff;color:var(--text);text-decoration:none;position:relative}
.filechip:hover{border-color:var(--brand)}
.fc-name{max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.filechip .thumb-x{position:static;width:16px;height:16px;line-height:14px;font-size:12px;margin-left:2px}
.attach-list{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.upload-hint{font-size:12px;color:var(--muted);align-self:center}


/* compact dropzone for answer images */
.dropzone-sm{padding:12px}
.dropzone-sm .dz-text{font-size:13px}


/* answer sheet */
.sheet-grid{display:flex;flex-wrap:wrap;gap:8px}
.sheet-cell{width:38px;height:38px;border-radius:8px;border:1px solid var(--line);background:#fff;cursor:pointer;font-weight:600;color:var(--text)}
.sheet-cell:hover{border-color:var(--brand)}
.sheet-cell.current{outline:2px solid var(--brand);border-color:var(--brand)}
.sheet-cell.g-ok{background:#dcfce7;border-color:#86efac;color:#166534}
.sheet-cell.g-mid{background:#fef3c7;border-color:#fcd34d;color:#92400e}
.sheet-cell.g-bad{background:#fee2e2;border-color:#fca5a5;color:#991b1b}


/* analysis view */
.stat-row{display:flex;gap:12px;flex-wrap:wrap}
.stat{flex:1;min-width:120px;background:#f8faff;border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.stat-num{font-size:26px;font-weight:700;color:var(--brand)}
.stat-lbl{font-size:12px;color:var(--muted);margin-top:4px}
.bar-row{display:flex;align-items:center;gap:10px;margin:6px 0}
.bar-label{width:130px;font-size:13px;color:var(--text);text-align:right;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar-track{flex:1;height:18px;background:#eef0f7;border-radius:9px;overflow:hidden}
.bar-fill{height:100%;border-radius:9px;background:var(--brand);transition:width .3s}
.bar-val{width:34px;font-size:12px;color:var(--muted);text-align:right}
.sel-box{width:16px;height:16px;cursor:pointer;margin-right:2px;flex:none}
.selbar{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 16px;border-radius:12px;display:flex;align-items:center;gap:10px;z-index:150;box-shadow:0 8px 24px rgba(0,0,0,.3)}
.selbar b{color:#fbbf24}


/* scores + topic */
.score-grid{display:flex;flex-wrap:wrap;gap:10px}
.score-chip{position:relative;width:110px;padding:10px;border:1px solid var(--line);border-radius:12px;background:#f8faff;cursor:pointer;text-align:center}
.score-chip:hover{border-color:var(--brand)}
.sc-year{font-size:12px;color:var(--muted)}
.sc-score{font-size:22px;font-weight:700;color:var(--brand)}
.sc-total{font-size:12px;color:var(--muted);font-weight:400}
.sc-sub{font-size:11px;color:var(--muted)}
.sc-del{position:absolute;top:2px;right:6px;color:#94a3b8;font-size:14px}
.sc-del:hover{color:var(--danger)}
button.chip{font:inherit;padding:4px 10px;margin:0 6px 6px 0}

.q-options{margin:6px 0 0 0;font-size:13px;line-height:1.9;color:var(--text)}
/* ---------- 答案 / 心得 ---------- */
.sec-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.sec-head>.sec-title{margin:0}
.ans-card{border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:8px;background:#fff}
.ans-card.top{border-color:#c7d2fe;background:#f8faff}
.ans-head{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.ans-rank{font-size:15px;color:var(--brand);font-weight:700}
.ans-title{font-weight:600;font-size:13px;color:var(--text)}
.ans-tools{margin-left:auto;display:flex;gap:4px}
.mini-btn{border:1px solid var(--line);background:#fff;border-radius:6px;min-width:26px;height:24px;line-height:1;font-size:13px;cursor:pointer;color:var(--muted);padding:0 6px}
.mini-btn:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}
.mini-btn:disabled{opacity:.35;cursor:default}
.mini-btn.danger:hover{border-color:var(--danger);color:var(--danger)}
.ans-text{white-space:pre-wrap;font-size:14px;line-height:1.75;color:var(--text)}
.ans-imgs{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.ans-img{max-width:180px;max-height:180px;border-radius:8px;border:1px solid var(--line);display:block}
.chip.src-ai{background:#eef2ff;color:#4338ca}
.chip.src-yb{background:#ecfdf5;color:#047857}
.chip.src-zt{background:#eff6ff;color:#1d4ed8}
.chip.done-chip{background:#dcfce7;color:#166534}
.ans-editor{border:1px dashed #c7d2fe;border-radius:12px;padding:12px;background:#fbfcff;margin-bottom:8px}
.ans-editor input[type=text]{margin-bottom:8px}
.ans-editor textarea{min-height:90px;margin-bottom:8px}
.ans-editor-imgs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:6px}
.ans-editor-imgs:empty{display:none}
.ans-editor.drag{border-color:var(--brand);background:#eef2ff}

/* ---------- AI 答疑 ---------- */
.chat-log{max-height:340px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:10px;background:#fafbff;margin-bottom:8px}
.msg{margin-bottom:10px;display:flex;flex-direction:column}
.msg-who{font-size:11px;color:var(--muted);margin-bottom:3px}
.msg-body{white-space:pre-wrap;font-size:14px;line-height:1.7;padding:8px 11px;border-radius:10px;max-width:100%;overflow-wrap:anywhere}
.msg.user{align-items:flex-end}
.msg.user .msg-body{background:var(--brand);color:#fff;border-bottom-right-radius:3px}
.msg.ai .msg-body{background:#fff;border:1px solid var(--line);border-bottom-left-radius:3px}
.msg.ai .msg-body .md-h2,.msg.ai .msg-body .md-h3{font-weight:700;margin:6px 0 2px}
.msg-ops{margin-top:2px}
.msg-ops .mini-btn{font-size:11px;height:22px}
.chat-box textarea{min-height:64px;margin-bottom:6px}
.mini-check{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:var(--muted);cursor:pointer}
.mini-check input{width:14px;height:14px;cursor:pointer}
.q-preview{max-height:260px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:10px;background:#fafbff;margin-bottom:6px}

/* ---------- 题目操作行 ---------- */
.q-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:6px}
.btn.done-btn{background:#dcfce7;border-color:#86efac;color:#166534;opacity:1}
.review-item.is-done{background:#fafafa;border-style:dashed;opacity:.72}
.review-item.is-done .q-body{color:#64748b}
.stem-md{white-space:pre-wrap}

/* ---------- 图片就地放大 ---------- */
img.q-img,img.q-fig,img.ans-img{cursor:zoom-in;transition:max-height .18s ease,box-shadow .18s ease}
img.zoomed{max-width:100%!important;max-height:none!important;width:auto!important;cursor:zoom-out;box-shadow:0 10px 34px rgba(15,23,42,.2);border:1px solid var(--line);border-radius:10px}

/* ---------- 题目详情页 ---------- */
.qdetail .q-body{font-size:16px;line-height:1.9}
.qdetail-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.qd-kps{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0 12px}
/* ---------- 成绩报告 ---------- */
.score-report{margin-top:12px}
.report-head{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.report-body{border:1px solid var(--line);border-radius:12px;padding:12px;background:#fbfcff}
.report-body .md-h2{font-size:15px;font-weight:700;margin:10px 0 4px;color:var(--brand)}
.report-body .md-h3{font-size:14px;font-weight:700;margin:12px 0 4px;color:var(--brand)}

/* ---------- 组卷来源 ---------- */
.paper-src{border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:#fbfcff}
.src-line{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:7px 0}
.src-line .meta{margin:0}

/* ---------- 移动端适配 ---------- */
@media(max-width:820px){
  .container{padding:12px 10px 96px}
  .card{padding:14px;border-radius:12px}
  .topbar{padding:8px 10px;gap:8px}
  .tabs{overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .tabs::-webkit-scrollbar{display:none}
  .tab{padding:7px 10px;font-size:13px;white-space:nowrap;flex:none}
  .status{display:none}
  .topbar-right .ghost{padding:6px 8px;font-size:12px}
  .modal-mask{padding:0;align-items:flex-start}
  .modal{max-width:100%;max-height:100dvh;min-height:100dvh;border-radius:0;padding:14px}
  .stat{min-width:calc(50% - 6px);padding:10px}
  .stat-num{font-size:22px}
  .bar-label{width:86px;font-size:12px}
  .bar-val{width:28px}
  .review-item{padding:10px}
  .q-body{font-size:15px}
  .q-actions{gap:6px}
  .q-actions .btn{font-size:12px;padding:6px 9px}
  .chat-log{max-height:44vh}
  .chat-box textarea{min-height:70px}
  .score-chip{width:calc(50% - 5px)}
  .selbar{left:8px;right:8px;bottom:10px;transform:none;justify-content:space-between;flex-wrap:wrap;padding:8px 12px}
  .sheet-cell{width:34px;height:34px}
  .ans-tools .mini-btn{height:26px;min-width:28px}
  textarea{min-height:110px}
  .qdetail-head{flex-direction:column;align-items:stretch}
  .qdetail-head .btn{width:100%}
  .ans-img{max-width:44vw;max-height:44vw}
  .filterbar{gap:6px}
  .filterbar select{font-size:12px}
  .toast{left:8px;right:8px;transform:none;bottom:12px;font-size:13px}
}
@media(max-width:430px){
  .stat{min-width:100%}
  .bar-label{width:70px}
  .card h2{font-size:15px}
  .btn{padding:8px 12px;font-size:13px}
}