:root{
  --bg:#f4f6fb; --card:#fff; --ink:#1c2333; --muted:#6b7488; --line:#e4e8f1;
  --brand:#2563eb; --brand2:#1e40af; --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
  --code:#0f172a; --radius:14px; --shadow:0 6px 24px rgba(16,24,40,.07);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;
}
code,pre,textarea{font-family:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace}
a{color:var(--brand)}
.muted{color:var(--muted)}
.grow{flex:1}
.row{display:flex;gap:10px;align-items:center}
.row.end{justify-content:flex-end}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:20;display:flex;gap:16px;align-items:center;justify-content:space-between;
  padding:10px 20px;color:#fff;
  background:linear-gradient(90deg,#2563eb,#4f46e5 55%,#7c3aed);
  box-shadow:0 4px 18px rgba(37,99,235,.28);
  backdrop-filter:blur(8px);
  transition:padding .22s ease, box-shadow .22s ease;
}
/* 吸顶压缩：滚动超过 30px 后顶栏变瘦，让内容更占屏 */
body.topbar-compressed .topbar{
  padding-top:6px;padding-bottom:6px;
  box-shadow:0 2px 10px rgba(37,99,235,.22);
}
body.topbar-compressed .brand .logo{font-size:18px}
body.topbar-compressed .brand h1{font-size:14px}
body.topbar-compressed .brand p{display:none}
.topbar a{color:#fff}
.brand{display:flex;gap:12px;align-items:center;min-width:0}
.brand .logo{font-size:22px;filter:drop-shadow(0 1px 2px #0004)}
.brand h1{font-size:16px;margin:0;color:#fff;font-weight:650;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand p{margin:0;font-size:11.5px;color:#e0e7ff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topnav{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.topnav .btn{
  border-color:#ffffff55;background:#ffffff1a;color:#fff;
}
.topnav .btn:hover{background:#ffffff33;border-color:#fff}
.topnav .btn.ghost{background:transparent}
/* 移动端菜单按钮 */
.menu-btn{
  display:none;align-items:center;justify-content:center;
  width:40px;height:40px;padding:0;flex:none;line-height:1;
  font-size:20px;border-radius:12px;cursor:pointer;
  background:#ffffff22;border:1px solid #ffffff55;color:#fff;
  transition:background .15s,border-color .15s,transform .12s;
}
.menu-btn:hover{background:#ffffff38;border-color:#fff}
.menu-btn:active{transform:scale(.94)}
.nav-pop{
  display:none;position:absolute;right:14px;top:calc(100% + 8px);min-width:220px;
  flex-direction:column;gap:4px;padding:10px;border-radius:14px;
  background:#fff;box-shadow:0 18px 50px rgba(16,24,40,.2);border:1px solid var(--line);z-index:30;
}
.nav-pop.show{display:flex;animation:navIn .16s ease}
@keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.nav-pop::before{content:"";position:absolute;top:-6px;right:22px;width:11px;height:11px;
  background:#fff;border-left:1px solid var(--line);border-top:1px solid var(--line);
  transform:rotate(45deg)}
.nav-pop .btn{justify-content:flex-start;text-align:left;width:100%;color:var(--ink)}
.nav-pop .btn:hover{background:#eef2ff;border-color:var(--brand);color:var(--brand)}
.nav-pop hr{margin:4px 0;border:none;border-top:1px solid var(--line)}

/* ---------- 按钮 ---------- */
.btn{
  border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:10px;
  padding:8px 14px;font-size:14px;cursor:pointer;transition:.15s;
}
.btn:hover{border-color:var(--brand);color:var(--brand)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand2);color:#fff}
.btn.ghost{background:transparent}
.btn.small{padding:5px 10px;font-size:13px}
.btn.big{padding:13px 44px;font-size:16px;letter-spacing:.2em}
.btn.danger{color:var(--bad);border-color:#fecaca}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- 布局 ---------- */
.layout{display:grid;grid-template-columns:290px 1fr;gap:16px;padding:16px 20px 60px;max-width:1400px;margin:0 auto}
.side{position:sticky;top:64px;align-self:start;display:flex;flex-direction:column;max-height:calc(100vh - 84px);background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.side-head{padding:10px;border-bottom:1px solid var(--line);background:#fafbfe}
.side-head input{width:100%;padding:8px 12px;border:1px solid var(--line);border-radius:10px;font-size:13px;background:#fff;transition:border-color .15s}
.side-head input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #2563eb1a}
.q-list{overflow:auto;padding:6px;flex:1}
.side-foot{border-top:1px solid var(--line);padding:8px;background:#fafbfe}
.side-foot .btn{width:100%}

.q-item{
  display:flex;justify-content:space-between;gap:8px;align-items:center;
  padding:8px 10px;border-radius:9px;cursor:pointer;font-size:13.5px;transition:background .12s;
}
.q-item:hover{background:#eef2ff}
.q-item.active{background:linear-gradient(90deg,#2563eb,#4f46e5);color:#fff;box-shadow:0 3px 10px #2563eb38}
.q-item .tag{font-size:11px;background:#eef2ff;color:var(--brand2);border-radius:6px;padding:1px 6px}
.q-item.active .tag{background:#ffffff33;color:#fff}
.q-year{font-weight:600;white-space:nowrap}
.q-group{font-size:11px;color:var(--muted);padding:8px 8px 2px;letter-spacing:.1em}
.badge-edit{font-size:10px;color:var(--warn)}

.main{display:flex;flex-direction:column;gap:16px;min-width:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.card-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}
.card-head h2,.card-head h3{margin:0;font-size:15.5px}
.card h4{margin:14px 0 6px;font-size:14px}

/* ---------- 题目 ---------- */
.q-title{font-size:17px;font-weight:700}
.q-meta{margin:4px 0 10px;display:flex;gap:8px;flex-wrap:wrap}
.q-meta .tag{font-size:12px;background:#eef2ff;color:var(--brand2);border-radius:6px;padding:2px 8px}
.q-body{font-size:14.5px}
.q-body p{margin:.5em 0}
.q-body pre{background:var(--code);color:#e2e8f0;padding:12px 14px;border-radius:10px;overflow:auto;font-size:13px}
.q-body code{background:#f1f5f9;padding:1px 5px;border-radius:5px;font-size:13px}
.q-body pre code{background:none;padding:0}
.q-body img{max-width:100%;border:1px solid var(--line);border-radius:10px;background:#fff;margin:6px 0}
.q-extra{margin-top:12px;border-top:1px dashed var(--line);padding-top:8px}
.q-extra summary{cursor:pointer;font-weight:600;font-size:14px}
/* 标准答案 + 评分点：可折叠 */
.ans-fold{border:1px solid var(--line);border-radius:12px;background:#fbfcff;margin-top:10px;overflow:hidden}
.ans-fold>summary{
  cursor:pointer;list-style:none;padding:10px 14px;font-size:14px;font-weight:600;
  background:#eef2ff;color:var(--brand2);user-select:none;display:flex;align-items:center;gap:8px;
}
.ans-fold>summary::-webkit-details-marker{display:none}
.ans-fold>summary::after{content:"▾";margin-left:auto;transition:.2s;opacity:.6}
.ans-fold[open]>summary::after{transform:rotate(-180deg)}
.ans-fold>summary .dot{width:9px;height:9px;border-radius:50%;background:var(--brand);display:inline-block}
.ans-fold#foldOfficial>summary{background:#f0fdf4;color:#15803d}
.ans-fold#foldOfficial>summary .dot{background:#16a34a}
.ans-fold>summary .hint{font-weight:400;font-size:12px;opacity:.65}
.ans-fold[open]>summary .hint{display:none}
.q-rubric,.q-official{padding:12px 14px;font-size:13.5px;max-height:520px;overflow:auto;border-top:1px solid var(--line)}
.q-rubric{white-space:normal}
.q-official{white-space:normal}
.q-official p{margin:.4em 0}
.q-body .md{font-size:14.5px}
.q-actions{display:flex;gap:10px;align-items:center;margin-top:12px;flex-wrap:wrap}
.q-rubric table,.q-official table{border-collapse:collapse;width:100%}
.q-rubric td,.q-rubric th,.q-official td,.q-official th{border:1px solid var(--line);padding:4px 8px;font-size:13px}
.q-rubric h2,.q-rubric h3,.q-official h2,.q-official h3{font-size:14.5px;margin:.7em 0 .3em}

/* ---------- 作答 ---------- */
.answer-tabs{display:flex;gap:6px;margin:6px 0}
.tab{border:1px solid var(--line);background:#f8fafc;padding:7px 14px;border-radius:9px 9px 0 0;cursor:pointer;font-size:13.5px}
.tab.active{background:#fff;border-bottom-color:#fff;box-shadow:0 -2px 0 var(--brand) inset}
.pane{display:none}
.pane.active{display:block}
textarea{
  width:100%;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:13.5px;line-height:1.6;
  background:#0f172a;color:#e2e8f0;min-height:220px;resize:vertical;
}
textarea.mid{min-height:140px;background:#fff;color:var(--ink)}
textarea.tall{min-height:340px}
.dropzone{
  border:2px dashed #c7d2fe;border-radius:12px;background:#f8faff;text-align:center;padding:22px 14px;cursor:pointer;
}
.dropzone.over{border-color:var(--brand);background:#eef2ff}
.dropzone p{margin:4px 0}
.thumbs{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.thumbs .th{position:relative;width:132px;height:132px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.thumbs .th img{width:100%;height:100%;object-fit:cover}
.thumbs .th button{position:absolute;top:4px;right:4px;border:none;background:#0009;color:#fff;border-radius:6px;cursor:pointer;font-size:12px;padding:1px 7px}

/* ---------- 配置 ---------- */
.cfg-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.cfg-grid label,.form-grid label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}
.cfg-grid select,.form-grid input,.form-grid select{
  padding:8px 10px;border:1px solid var(--line);border-radius:9px;font-size:14px;background:#fff;color:var(--ink)
}
.chk-line{flex-direction:row!important;align-items:center;gap:8px!important;color:var(--ink)!important}
.chk{font-size:13px;color:var(--muted);display:flex;gap:6px;align-items:center}
.run-row{display:flex;gap:16px;align-items:center;margin-top:14px}
.status{font-size:13px;color:var(--muted)}
.status.ok{color:var(--ok)} .status.bad{color:var(--bad)}

/* ---------- 结果 ---------- */
.score-hero{display:flex;gap:22px;align-items:center;flex-wrap:wrap;padding:6px 0 12px}
.score-ring{
  width:118px;height:118px;border-radius:50%;display:grid;place-items:center;flex:none;
  background:conic-gradient(var(--brand) calc(var(--pct)*1%), #e8edf7 0);
}
.score-ring .inner{width:92px;height:92px;border-radius:50%;background:#fff;display:grid;place-items:center;text-align:center;line-height:1.2}
.score-ring b{font-size:26px}
.score-ring span{font-size:11px;color:var(--muted)}
.grade-pill{font-size:20px;font-weight:700}
.parts{display:flex;flex-direction:column;gap:10px;margin:6px 0}
.part{border:1px solid var(--line);border-radius:10px;padding:9px 12px}
.part .p-top{display:flex;justify-content:space-between;font-size:14px;font-weight:600}
.bar{height:7px;background:#eef1f8;border-radius:99px;margin-top:7px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),#60a5fa);border-radius:99px}
.part ul{margin:7px 0 0;padding-left:18px;font-size:13px;color:#374151}
.pts{font-size:12.5px;color:var(--muted);margin-top:4px}
.pts i{font-style:normal;color:var(--ok)} .pts b{color:var(--bad);font-weight:600}
.listbox{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-top:10px;font-size:13.5px}
.listbox h5{margin:0 0 6px;font-size:13.5px}
.listbox li{margin:5px 0}
.evi{color:var(--muted);font-size:12.5px}
pre.ref{background:var(--code);color:#e2e8f0;padding:12px;border-radius:10px;overflow:auto;font-size:12.8px;white-space:pre-wrap}
details.raw{margin-top:10px}
details.raw summary{cursor:pointer;font-size:13px;color:var(--muted)}

/* ---------- 弹窗 ---------- */
.modal{position:fixed;inset:0;background:#0b1220aa;display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal[hidden]{display:none!important}   /* hidden 属性必须生效，否则 display:flex 会盖过它 */
.dialog{background:#fff;border-radius:16px;padding:18px 20px;width:min(520px,94vw);max-height:92vh;overflow:auto;box-shadow:0 24px 60px #0004}
.dialog.wide{width:min(880px,96vw)}
.dialog h3{margin:0 0 6px}
.dialog hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.dialog .err{color:var(--bad);font-size:13px;min-height:18px;margin:6px 0}
.dialog input[type=password],.dialog>input,.block>input{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font-size:14px;margin-top:4px}
.block{display:block;font-size:13px;color:var(--muted);margin-top:10px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:10px 0}
.form-grid .span2{grid-column:span 2}
.preset-row{display:flex;gap:7px;flex-wrap:wrap;margin:8px 0}
.preset-row button{border:1px solid var(--line);background:#f8fafc;border-radius:99px;padding:4px 12px;font-size:12.5px;cursor:pointer}
.preset-row button:hover{border-color:var(--brand);color:var(--brand)}
.provider-list{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.provider-item{display:flex;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:13.5px}
.provider-item .nm{font-weight:600}
.provider-item .mdl{color:var(--muted);font-size:12.5px}
.provider-item .vision{font-size:11px;background:#ecfdf5;color:#059669;border-radius:6px;padding:1px 6px}

/* ---------- 题目编辑器 ---------- */
.block-editor{display:flex;flex-direction:column;gap:10px;margin:8px 0}
.blk{border:1px solid var(--line);border-radius:10px;padding:10px;background:#fbfcff;position:relative}
.blk .blk-head{display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted);margin-bottom:6px}
.blk .blk-head .grow{flex:1}
.blk textarea{min-height:110px;background:#fff;color:var(--ink);border:1px solid var(--line)}
.blk img{max-width:340px;border-radius:8px;border:1px solid var(--line);display:block}
.blk .mv{border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;font-size:12px;padding:1px 8px}
.preview{border:1px dashed var(--line);border-radius:10px;padding:12px;margin-top:8px;background:#fff;max-height:320px;overflow:auto}
.history{display:flex;flex-direction:column;gap:8px;max-height:50vh;overflow:auto}
.hist-item{border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:13.5px;cursor:pointer;display:flex;justify-content:space-between;gap:10px}
.hist-item:hover{border-color:var(--brand)}

.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 18px;border-radius:10px;font-size:14px;z-index:99;box-shadow:0 10px 30px #0003}

@media (max-width:980px){
  .layout{grid-template-columns:1fr}
  .side{position:static;max-height:34vh}
  .form-grid{grid-template-columns:1fr}
  /* 顶栏：一行吸顶，功能收进菜单 */
  .topbar{flex-direction:row;align-items:center;padding:8px 12px;gap:8px;position:sticky;top:0}
  .topbar .logo{font-size:18px}
  .brand h1{font-size:15px}
  .brand p{display:none}
  body.topbar-compressed .topbar{padding:5px 12px}
  body.topbar-compressed .brand .logo{font-size:16px}
  body.topbar-compressed .brand h1{font-size:13px}
  .topnav{gap:6px}
  .topnav .btn:not(.menu-btn){display:none}
  .menu-btn{display:inline-flex}
  .user-box .u-name{font-size:12px;color:#e0e7ff}
  .user-box .btn{display:none}
}

/* ============ Markdown 渲染（题干 / 评分细则 / 标准答案） ============ */
.md{font-size:14.5px;line-height:1.85;color:#1f2733;word-break:break-word}
.md>p{margin:.55em 0}
.md>h1,.md>h2,.md>h3,.md>h4{margin:1.1em 0 .5em;line-height:1.4;color:#111827}
.md>h1{font-size:19px}
.md>h2{font-size:17px;padding-bottom:6px;border-bottom:2px solid #e6ebf5}
.md>h3{font-size:15.5px;color:#1d4ed8}
.md>h3::before{content:"";display:inline-block;width:4px;height:14px;background:#3b82f6;border-radius:2px;margin-right:8px;vertical-align:-1px}
.md>h4{font-size:14.5px;color:#374151}
.md ul,.md ol{padding-left:1.5em;margin:.5em 0}
.md li{margin:.3em 0}
.md li::marker{color:#3b82f6}
.md strong{color:#0f172a;font-weight:700}
.md em{color:#6b7280}
.md hr{border:none;border-top:1px dashed #d7deea;margin:1em 0}
.md a{color:#2563eb;text-decoration:none}
.md a:hover{text-decoration:underline}

/* 引用块 = 评分说明提示框（绿色，参考官方解析样式） */
.md blockquote{
  margin:.8em 0;padding:10px 14px;background:#f0fdf4;border-left:4px solid #22c55e;
  border-radius:0 10px 10px 0;color:#14532d;font-size:14px;line-height:1.8
}
.md blockquote p{margin:.3em 0}
.md blockquote::first-line{font-weight:600}

/* 表格（评分表） */
.md table{border-collapse:collapse;margin:.8em 0;width:100%;font-size:13.5px;background:#fff;display:table;overflow:auto}
.md thead th{background:#f1f5f9;font-weight:700;color:#334155}
.md th,.md td{border:1px solid #dbe2ef;padding:7px 11px;text-align:left;vertical-align:top}
.md tbody tr:nth-child(even){background:#f8fafc}
.md tbody tr:hover{background:#eef4ff}

/* 行内代码 */
.md code{background:#f1f5f9;color:#be123c;padding:1.5px 6px;border-radius:5px;font-size:13px;
  font-family:ui-monospace,SFMono-Regular,Consolas,monospace}

/* 代码块（深色 + 语法高亮，参考官方代码截图） */
.md pre{background:#0f172a;border-radius:12px;padding:14px 16px;overflow:auto;margin:.8em 0;
  box-shadow:inset 0 0 0 1px #1e293b}
.md pre code{background:none;color:#e2e8f0;padding:0;font-size:13.2px;line-height:1.7;
  display:block;white-space:pre;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}
.md pre code .c-kw{color:#7dd3fc;font-weight:600}
.md pre code .c-str{color:#86efac}
.md pre code .c-com{color:#64748b;font-style:italic}
.md pre code .c-num{color:#fbbf24}
.md pre::-webkit-scrollbar{height:8px}
.md pre::-webkit-scrollbar-thumb{background:#334155;border-radius:8px}

/* 题图：完整显示、居中、带边框（不裁剪） */
.md img,.q-body img.fig{max-width:100%;height:auto;display:block;margin:12px auto;
  border:1px solid #e2e8f0;border-radius:10px;background:#fff;padding:6px;object-fit:contain}
.q-body img{max-width:100%;height:auto}

/* 数学 */
.md .katex{font-size:1.02em}

/* ============ 管理后台 ============ */
.user-box{display:flex;gap:8px;align-items:center}
.u-name{font-size:13.5px;font-weight:600;color:#1f2937;background:#eef2ff;border-radius:99px;padding:5px 13px}
.admin-wrap{max-width:1240px;margin:0 auto;padding:18px 20px 60px;display:flex;flex-direction:column;gap:16px}
.tbl-wrap{overflow:auto;max-height:56vh}
.tbl{width:100%;border-collapse:collapse;font-size:13.5px}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:middle;white-space:nowrap}
.tbl thead th{position:sticky;top:0;background:#f8fafc;font-weight:700;color:#475569;z-index:2}
.tbl tbody tr:hover{background:#f6f9ff}
.tbl .ops{display:flex;gap:6px;flex-wrap:wrap;white-space:normal}
.tbl .mono,.mono{font-family:ui-monospace,Consolas,monospace;font-size:12.5px;color:#475569}
.tag{display:inline-block;font-size:11.5px;padding:2px 8px;border-radius:6px;background:#eef2ff;color:#3730a3}
.tag.adm{background:#fef3c7;color:#92400e}
.tag.on{background:#dcfce7;color:#166534}
.tag.off{background:#fee2e2;color:#991b1b}
.mini-search{padding:6px 10px;border:1px solid var(--line);border-radius:9px;font-size:13px;min-width:160px}
.tabs{display:flex;gap:6px;margin:8px 0}
.d-body{max-height:46vh;overflow:auto}
.created-box{margin-top:12px}
.gen-pass{border:1px solid #bbf7d0;background:#f0fdf4;border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:7px;font-size:14px}
.gen-pass>div{display:flex;gap:10px;align-items:center}
.gen-pass span{color:#4b5563;min-width:42px}
.pw{font-family:ui-monospace,Consolas,monospace;font-size:16px;color:#166534;letter-spacing:.5px}
.btn.danger{color:#dc2626;border-color:#fecaca}

/* 平台共享 API */
.shared-note{background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af;border-radius:10px;
  padding:9px 13px;font-size:13.5px;line-height:1.7;margin:6px 0}
.shared-note b{color:#1d4ed8}
.provider-item.locked{background:#f8fbff;border-color:#cfe0ff}
.provider-item.locked .nm{color:#1d4ed8}
.lock-tag{background:#dbeafe;color:#1e40af;font-size:11px;padding:2px 8px;border-radius:6px;white-space:nowrap}
.provider-item{flex-wrap:wrap}