/* 学情系统 v2 P1 · 移动面板样式（移动优先、低端机友好、零依赖）*/
* { box-sizing: border-box; }
body {
  margin: 0; color: #1f2a37; background: #f4f6f8;
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 560px; margin: 0 auto; padding: 16px; }
h1 { font-size: 20px; margin: 12px 0; }
.card {
  background: #fff; border-radius: 12px; padding: 16px; margin: 12px 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08);
}
.center { text-align: center; }
.big { font-size: 44px; font-weight: 700; color: #2563eb; }
.sub { color: #6b7280; font-size: 13px; }
.menu { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
.tile {
  display: block; padding: 22px 12px; background: #fff; border-radius: 12px;
  text-align: center; text-decoration: none; color: #1f2a37; font-size: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08);
}
label { display: block; margin: 10px 0; font-size: 14px; }
select, input[type=text], input[type=password] {
  width: 100%; padding: 12px; font-size: 16px; margin-top: 6px;
  border: 1px solid #d1d5db; border-radius: 8px;
}
button {
  width: 100%; padding: 13px; margin-top: 12px; font-size: 16px;
  color: #fff; background: #2563eb; border: none; border-radius: 8px;
}
button:active { background: #1d4ed8; }
button.link, .link {
  width: auto; padding: 6px 0; display: inline-block;
  background: none; color: #2563eb; box-shadow: none; text-decoration: underline;
}
.msg, .fb { margin-top: 10px; font-size: 14px; color: #b91c1c; }
.fb { color: #1f2a37; }
.opt { display: block; padding: 11px; margin: 8px 0; border: 1px solid #e5e7eb; border-radius: 8px; }
.qtype { color: #6b7280; font-size: 12px; }
.stem { margin: 10px 0; font-size: 17px; line-height: 1.5; }
.biglink { font-size: 16px; word-break: break-all; }
code { word-break: break-all; }
h3 { font-size: 15px; margin: 4px 0 10px; }
.hmrow { display: grid; grid-template-columns: 92px 1fr auto; gap: 8px; align-items: center; margin: 6px 0; font-size: 12px; }
.hmlbl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hmbar { height: 14px; background: #eef1f4; border-radius: 4px; overflow: hidden; }
.hmbar i { display: block; height: 100%; }
.hmval { color: #6b7280; white-space: nowrap; }
.slist { margin: 0; padding-left: 18px; }
.slist li { margin: 6px 0; }
.arow, .qblock { padding: 12px 0; border-bottom: 1px solid #eee; }
.qblock:last-of-type { border-bottom: none; }
.pbar { display: inline-block; width: 80px; height: 12px; background: #eef1f4; border-radius: 4px; overflow: hidden; vertical-align: middle; }
.pbar i { display: block; height: 100%; }
.chap > summary { cursor: pointer; font-size: 15px; padding: 4px 0; }
.sec { margin: 8px 0 8px 6px; }
.sec > summary { cursor: pointer; font-size: 13px; color: #374151; padding: 4px 0; }
.leafrow { display: grid; grid-template-columns: 1fr 80px auto; gap: 8px; align-items: center; padding: 6px 0 6px 12px; font-size: 13px; }
.leaflbl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* 波3 · WI-4b：叶子（试验/方法）点名字直达知识点详情——路径页是学生看得最多的
   页面之一，此前 1799 页知识库在这里一个入口都没有。 */
.leaflink { color: #4338ca; text-decoration: none; border-bottom: 1px dotted #a5b4fc; }
.leaflink:active { color: #3730a3; }
.ordopt { display: inline-block; width: auto; margin: 4px 6px 4px 0; padding: 8px 12px; font-size: 14px; color: #1f2a37; background: #eef2ff; border: 1px solid #c7d2fe; border-radius: 8px; }
.ordopt.picked { opacity: .45; }
.ordseq { margin-top: 8px; }
@media (max-width: 380px) { .menu { grid-template-columns: 1fr; } }
/* 知识点详情（波1 · WI-1）：★带 source_span 与不带出处的内容必须视觉分层——
   绿条=可回溯到规范原文，灰条=页面概述。学生据此判断能不能信这行数字。 */
.grounded { border-left: 3px solid #059669; background: #f0fdf4; padding: 9px 11px; border-radius: 0 8px 8px 0; margin: 8px 0; }
.ungrounded { border-left: 3px solid #cbd5e1; background: #f8fafc; padding: 9px 11px; border-radius: 0 8px 8px 0; margin: 8px 0; font-size: 14px; line-height: 1.6; }
.wspan { font-size: 12px; color: #047857; margin-top: 5px; word-break: break-all; }
.wnote { font-size: 12px; color: #6b7280; margin-top: 5px; }
.wparam-name { font-size: 14px; font-weight: 600; }
.wparam-value { font-size: 14px; line-height: 1.6; margin-top: 3px; }
.wlink { display: inline-block; background: #eef2ff; color: #4338ca; border: 1px solid #c7d2fe; border-radius: 8px;
         padding: 7px 11px; margin: 4px 6px 4px 0; font-size: 14px; text-decoration: none; }
.wdead { display: inline-block; color: #6b7280; font-size: 14px; margin: 4px 6px 4px 0; }
.wrel-group { margin: 8px 0; }
.wrel-kind { font-size: 12px; color: #6b7280; }
/* 问答与判分反馈（波2 · WI-2b/2c）：接地信号必须先于回答正文、且颜色语义与详情页一致
   （绿=有出处可回溯，黄=没接地要打折扣看）。 */
.warnbar { background: #fffbeb; border: 1px solid #fcd34d; border-left: 4px solid #f59e0b;
           color: #92400e; border-radius: 8px; padding: 11px 13px; margin: 12px 0;
           font-size: 14px; line-height: 1.55; }
.okbar { background: #f0fdf4; border: 1px solid #a7f3d0; border-left: 4px solid #059669;
         color: #065f46; border-radius: 8px; padding: 11px 13px; margin: 12px 0; font-size: 14px; }
.answer { font-size: 15px; line-height: 1.7; white-space: pre-wrap; word-break: break-word; }
.chiprow { display: flex; flex-wrap: wrap; }
textarea { width: 100%; padding: 12px; font-size: 16px; margin-top: 6px;
           border: 1px solid #d1d5db; border-radius: 8px; font-family: inherit; }
.fbdetail { margin-top: 8px; font-size: 14px; line-height: 1.6; color: #374151;
            background: #f8fafc; border-left: 3px solid #cbd5e1; border-radius: 0 8px 8px 0;
            padding: 9px 11px; white-space: pre-wrap; word-break: break-word; }
.fbnode { margin-top: 8px; font-size: 13px; color: #6b7280; }
/* 教师台（/teacher）：桌面为主、手机可用；只加教师台专用类，不改学生端既有样式。 */
[hidden] { display: none !important; }   /* .trow 等 display:flex 不许盖过 hidden 属性 */
.wrap.wide { max-width: 980px; }
.tbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.tbar h1 { margin: 8px 0; }
.trow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.trow > label { flex: 1 1 160px; margin: 6px 0; }
.trow select, .trow input { margin-top: 4px; }
.btn-inline { width: auto; padding: 9px 16px; margin-top: 0; font-size: 14px; }
.btn-ghost { background: #eef2ff; color: #3730a3; border: 1px solid #c7d2fe; }
.btn-ghost:active { background: #e0e7ff; }
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 10px; margin-left: 6px; vertical-align: middle; }
.badge.ok { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.badge.warn { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.clsrow, .qzrow, .asrow { padding: 12px 0; border-bottom: 1px solid #eee; }
.clsrow:last-child, .qzrow:last-child, .asrow:last-child { border-bottom: none; }
.clslinks a { margin-right: 14px; font-size: 14px; }
.qitem { display: grid; grid-template-columns: 28px 1fr; gap: 6px; padding: 10px 0; border-bottom: 1px solid #f0f0f0; }
.qitem input[type=checkbox] { width: 18px; height: 18px; margin-top: 3px; }
.qmeta { color: #6b7280; font-size: 12px; }
.qstem { font-size: 15px; line-height: 1.5; margin: 3px 0; }
.qopts { margin: 4px 0 0 0; padding-left: 18px; font-size: 13px; color: #374151; }
.qans { font-size: 13px; color: #065f46; margin-top: 4px; }
.qsrc { font-size: 12px; color: #6b7280; word-break: break-all; }
.qlist { max-height: 60vh; overflow-y: auto; border: 1px solid #eee; border-radius: 8px; padding: 0 10px; }
.note { font-size: 13px; color: #92400e; background: #fffbeb; border: 1px solid #fde68a; border-radius: 8px; padding: 8px 10px; margin-top: 8px; }
textarea.roster { width: 100%; min-height: 110px; padding: 10px; font: 14px/1.5 ui-monospace, Menlo, Consolas, monospace;
                  border: 1px solid #d1d5db; border-radius: 8px; margin-top: 6px; }
pre.example { background: #f8fafc; border: 1px dashed #cbd5e1; border-radius: 8px; padding: 8px 10px; font-size: 13px; margin: 6px 0; white-space: pre-wrap; }
input[type=datetime-local], input[type=search] { width: 100%; padding: 10px; font-size: 15px; border: 1px solid #d1d5db; border-radius: 8px; }
.ok-text { color: #166534; }