:root{
  --ink:#0b1220; --ink-2:#26303f; --muted:#6a7686;
  --line:#e3e7ee; --bg:#f6f7f9; --card:#fff;
  --brand:#123a6b; --brand-2:#1f66b8;
  --ok:#127a4b; --warn:#9a6410; --bad:#a32b2b;
  --radius:14px;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0;padding:0;overflow-x:hidden}
img,svg{max-width:100%}
body{
  background:var(--bg); color:var(--ink);
  font:16px/1.65 "PingFang SC","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{margin:0;font-weight:650;letter-spacing:-.01em}
h1{font-size:19px}
h2{font-size:20px;margin-bottom:6px}
h3{font-size:16px;margin-bottom:12px;display:flex;gap:10px;align-items:baseline}
.small,.sub{font-weight:400;font-size:12.5px;color:var(--muted)}

.top{
  display:flex;justify-content:space-between;align-items:center;gap:20px;
  padding:14px 26px;background:var(--card);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:10;flex-wrap:wrap;
}
.brand{display:flex;gap:14px;align-items:center;min-width:0}
.brand>div{min-width:0}
h1{overflow-wrap:anywhere}
.logo{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--brand),var(--brand-2));color:#fff;
  font-weight:700;font-size:13px;letter-spacing:.05em;flex:none;
}
.sub{margin:2px 0 0}
.who{display:flex;gap:12px;align-items:center;font-size:14px;color:var(--ink-2)}

main{max-width:1180px;margin:0 auto;padding:22px 20px 60px}
.foot{max-width:1180px;margin:0 auto;padding:0 20px 30px;color:var(--muted);font-size:12.5px;text-align:center}
.view{display:block}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 22px;margin-bottom:16px;
}
.cols{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);gap:16px}
.cols>*{min-width:0}
.card{min-width:0;overflow-wrap:anywhere}
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media (max-width:900px){.cols{grid-template-columns:1fr}}

/* 登录 */
.loginwrap{max-width:460px;margin:40px auto}
.loginwrap .card{padding:26px}
label{display:block;margin:12px 0;font-size:14px;color:var(--ink-2)}
input,textarea,select{
  width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);
  border-radius:10px;font:inherit;font-size:15px;color:var(--ink);background:#fcfcfd;
  outline:none;transition:border-color .15s, box-shadow .15s;
}
input:focus,textarea:focus{border-color:var(--brand-2);box-shadow:0 0 0 3px rgba(31,102,184,.12);background:#fff}
textarea{resize:vertical;min-height:64px}
button{font:inherit;cursor:pointer;border-radius:10px;border:1px solid transparent;padding:10px 18px;transition:.15s}
button:disabled{opacity:.55;cursor:not-allowed}
.primary{background:var(--brand);color:#fff;font-weight:600}
.primary:hover{background:var(--brand-2)}
.ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.ghost:hover{border-color:#c9d2df}
.link{background:none;border:none;color:var(--brand-2);padding:6px 0;font-size:13.5px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.hint{color:var(--muted);font-size:13.5px;margin:0 0 8px}
.msg{font-size:13.5px;margin:8px 0 0}
.err{color:var(--bad)}
.good{color:var(--ok)}

/* 周次条 */
.weekbar{
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 20px;margin-bottom:16px;
}
.weekbar .wk{display:flex;gap:12px;align-items:baseline}
.weekbar strong{font-size:18px}
.weekbar .deadline{color:var(--muted);font-size:13.5px;flex:1}
.badge{font-size:12.5px;padding:5px 12px;border-radius:999px;font-weight:600}
.badge.open{background:#eef4ff;color:#1b4f9c}
.badge.ontime{background:#e8f6ee;color:var(--ok)}
.badge.late{background:#fdf3e2;color:var(--warn)}
.badge.missing{background:#fdecec;color:var(--bad)}
.badge.done{background:#eef2f6;color:var(--muted)}
.badge.frozen{background:#eef2f6;color:var(--muted)}

/* 计划 */
.plan ul{margin:6px 0 0;padding-left:20px}
.plan li{margin:4px 0}
.chip{display:inline-block;font-size:12px;padding:2px 9px;border-radius:999px;background:#eef4ff;color:#1b4f9c;margin-right:6px}
.chip.gray{background:#f0f2f5;color:var(--muted)}

/* 附件 */
.files{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}
.file{display:flex;gap:12px;align-items:center;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:#fcfcfd;font-size:14px}
.file .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file a{color:var(--brand-2);text-decoration:none}
.file .rm{color:var(--bad);background:none;border:none;padding:2px 6px}
.upload .btn{display:inline-block;padding:10px 16px;border:1px dashed #c3cddd;border-radius:10px;color:var(--ink-2);font-size:14px;background:#fbfcfe}
.upload .btn:hover{border-color:var(--brand-2);color:var(--brand-2)}

/* 指导 */
.guide{white-space:pre-wrap;color:var(--ink-2);font-size:15px;line-height:1.8;background:#fbfcfe;border:1px solid var(--line);border-radius:10px;padding:14px 16px}
.guide.empty{color:var(--muted)}

/* 历史 */
.history{display:flex;gap:6px;flex-wrap:wrap}
.hcell{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;font-size:12.5px;border:1px solid var(--line);background:#fff;color:var(--muted)}
.hcell.ontime{background:#e8f6ee;color:var(--ok);border-color:#cfe9db}
.hcell.late{background:#fdf3e2;color:var(--warn);border-color:#f0dfc0}
.hcell.missing{background:#fdecec;color:var(--bad);border-color:#f3cfcf}
.hcell.frozen{background:#f1f3f6;color:#a8b1bd}
.hcell.cur{outline:2px solid var(--brand-2);outline-offset:1px}

/* 教师表 */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th,.tbl td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{color:var(--muted);font-weight:600;font-size:13px}
.tbl tr:hover td{background:#fbfcfe}
.tbl td.nm{color:var(--brand-2);cursor:pointer;font-weight:600}
.report{white-space:pre-wrap;font-size:14.5px;line-height:1.85;background:#fbfcfe;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:14px}
.report b{display:block;color:var(--muted);font-weight:600;font-size:12.5px;margin-top:10px}
.report b:first-child{margin-top:0}

/* ==================== 自适应：平板 / 手机 ==================== */
@media (max-width:1024px){
  main{padding:18px 16px 56px}
  .card{padding:18px}
  .report,.guide{font-size:14.5px}
}

@media (max-width:640px){
  body{font-size:15.5px}
  .top{padding:10px 14px;gap:10px}
  .logo{width:36px;height:36px;border-radius:10px;font-size:12px}
  h1{font-size:15.5px;line-height:1.35}
  .sub{display:none}
  .who{gap:8px}
  .who span{font-size:13px;max-width:110px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .ghost{padding:8px 12px;font-size:13.5px}
  main{padding:12px 12px 44px}
  h2{font-size:18px}
  h3{font-size:15px;margin-bottom:10px;display:block}
  h3 .small{display:block;margin-top:3px;line-height:1.5}
  .card{padding:15px 14px;border-radius:12px;margin-bottom:12px}
  .weekbar{gap:8px;padding:12px 14px;border-radius:12px;margin-bottom:12px}
  .weekbar .wk{flex-direction:column;gap:1px;width:100%}
  .weekbar strong{font-size:17px}
  .weekbar .deadline{flex:1 1 100%;font-size:12.5px}
  .badge{margin-left:0}
  input,textarea,select{font-size:16px;padding:11px 12px}
  textarea{min-height:76px}
  button{padding:11px 16px}
  .row{gap:8px}
  .row>button{flex:1 1 auto}
  .hcell{width:34px;height:34px;font-size:12px;border-radius:8px}
  .file{gap:8px;padding:10px 12px;align-items:center}
  .file .nm{flex:1 1 100%;white-space:normal;word-break:break-all}
  .file .small{flex:none;white-space:nowrap}
  .file .rm{flex:none;white-space:nowrap;padding:6px 10px}
  .upload .btn{display:block;text-align:center;padding:13px}
  .loginwrap{margin:18px auto;max-width:100%}
  .loginwrap .card{padding:20px 16px}
  .loginwrap .primary{width:100%}
  .foot{padding:0 12px 24px;font-size:12px}
}

/* 手机上教师表：一行变一张卡 */
@media (max-width:720px){
  .tbl thead{display:none}
  .tbl tr{display:block;border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:10px;background:#fff}
  .tbl td{display:grid;grid-template-columns:72px minmax(0,1fr);column-gap:10px;align-items:baseline;border:none;padding:4px 0;font-size:14px;text-align:left}
  .tbl td::before{content:attr(data-label);color:var(--muted);font-size:12.5px}
  .tbl td .badge{justify-self:start;width:max-content}
  .tbl td.nm{display:block;padding:0 0 8px;margin-bottom:6px;border-bottom:1px dashed var(--line);font-size:15.5px}
  .tbl td.nm::before{display:none}
  .tbl tr:hover td{background:transparent}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important}
}