/* ============================================================================
   TeachDuel · Teacher console — styles
   "War room" cold theme: teal-led, compact radii, data-dense tables.
   Deliberately the cold mirror of the parent dashboard's warm "Greenhouse":
   same brand tokens, opposite emotional register (efficiency vs. encouragement).
   Reuses the site's brand tokens (teal #0F766E / amber #F59E0B / Space Grotesk).
   ============================================================================ */
:root{
  --paper:#F4F6FA; --card:#FFFFFF; --ink:#10142A; --mute:#6B7290; --line:#E3E7F0;
  --teal:#0F766E; --teal-bright:#115e59; --teal-soft:#f0fdfa;
  --amber:#F59E0B; --green:#16A34A; --red:#DC2626; --warn:#E2830B;
  /* 站内外链字体全部自托管(CSP font-src 'self')，故改系统字体栈；
     显示字体用 tight tracking + 字重差维持「作战室」的技术感 */
  --disp:system-ui,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --ui:system-ui,'Segoe UI',Roboto,'Helvetica Neue','PingFang SC','Microsoft YaHei',Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--ui);color:var(--ink);background:var(--paper);
  background-image:radial-gradient(rgba(15,118,110,.05) 1px,transparent 1.2px);background-size:24px 24px;min-height:100vh}
button{font-family:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--teal-bright);outline-offset:2px;border-radius:5px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

.hd{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;padding:13px 20px;background:rgba(244,246,250,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.logo{font-family:var(--disp);font-weight:700;font-size:1.2rem;letter-spacing:-.02em}
.logo b{color:var(--teal)} .logo i{font-style:normal;color:var(--amber)}
.role{display:inline-flex;align-items:center;gap:6px;background:rgba(15,118,110,.1);color:var(--teal);font-weight:700;font-size:.74rem;padding:5px 11px;border-radius:999px}
.role .dot{width:7px;height:7px;border-radius:50%;background:var(--teal-bright)}
.spacer{flex:1}
.newc{background:var(--teal);color:#fff;border:0;border-radius:10px;font-weight:700;font-size:.83rem;padding:9px 15px;transition:background .12s}
.newc:hover{background:var(--teal-bright)}

.shell{max-width:1080px;margin:0 auto;padding:18px 16px 50px;display:grid;grid-template-columns:190px 1fr;gap:18px}

.rail{display:flex;flex-direction:column;gap:8px}
.rail .rl{font-size:.64rem;font-weight:700;letter-spacing:.16em;color:var(--mute);padding:0 4px 2px}
.cls{display:flex;align-items:center;gap:9px;background:var(--card);border:2px solid var(--line);border-radius:12px;padding:9px 11px;text-align:left;width:100%;transition:border-color .15s,transform .15s}
.cls:hover{border-color:var(--teal-bright)}
.cls.on{border-color:var(--teal);box-shadow:0 0 0 4px rgba(15,118,110,.12)}
.cls .ci{width:30px;height:30px;border-radius:8px;background:var(--teal-soft);color:var(--teal);display:grid;place-items:center;font-family:var(--disp);font-weight:700;font-size:.85rem;flex:none}
.cls .cn{font-weight:700;font-size:.86rem;line-height:1.05}
.cls .cs{font-size:.66rem;color:var(--mute)}
.addc{border:2px dashed var(--line);background:transparent;color:var(--mute);border-radius:12px;padding:9px;font-weight:700;font-size:.8rem}
.addc:hover{border-color:var(--teal);color:var(--ink)}

.main{min-width:0}
.tabs{display:inline-flex;gap:3px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:4px;margin-bottom:16px}
.tab{border:0;background:transparent;color:var(--mute);font-weight:700;font-size:.83rem;padding:8px 16px;border-radius:8px;transition:all .12s}
.tab.on{background:var(--teal);color:#fff}

.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}

/* assignment header */
.assign-h{display:flex;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:7px;background:var(--teal-soft);color:var(--teal);font-weight:700;font-size:.8rem;padding:7px 13px;border-radius:999px}
.pill.done{background:rgba(22,163,74,.12);color:var(--green)}
.pill.pend{background:rgba(226,131,11,.14);color:var(--warn)}
.pill .d{font-family:var(--disp);font-variant-numeric:tabular-nums}

/* class weak-spot */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:4px}
.blk{background:var(--teal-soft);border-radius:12px;padding:13px 14px}
.blk .ttl{font-family:var(--disp);font-weight:700;font-size:.92rem;margin-bottom:10px}
.oprow{display:flex;align-items:center;gap:10px;margin:7px 0}
.oprow .op{font-family:var(--disp);font-weight:700;width:20px}
.oprow .bar{flex:1;height:8px;border-radius:999px;background:#D9DEF2;overflow:hidden}
.oprow .bar i{display:block;height:100%;border-radius:999px}
.oprow .pc{font-family:var(--disp);font-weight:700;font-size:.82rem;width:42px;text-align:right}
.oprow.low .bar i{background:var(--red)} .oprow.low .pc{color:var(--red)}
.oprow.mid .bar i{background:var(--amber)} .oprow.mid .pc{color:var(--warn)}
.oprow.hi .bar i{background:var(--green)} .oprow.hi .pc{color:var(--green)}

/* student table */
.secttl{display:flex;align-items:center;gap:8px;font-family:var(--disp);font-weight:700;font-size:1rem;margin:18px 2px 10px}
table{width:100%;border-collapse:collapse;font-size:.85rem}
th{text-align:left;font-size:.66rem;font-weight:700;letter-spacing:.08em;color:var(--mute);padding:8px 10px;border-bottom:1px solid var(--line)}
td{padding:9px 10px;border-bottom:1px solid #EEF1F7}
tr:last-child td{border-bottom:0}
.stu{display:flex;align-items:center;gap:9px}
.stu .av{width:28px;height:28px;border-radius:8px;background:#f0fdfa;color:var(--teal);display:grid;place-items:center;font-family:var(--disp);font-weight:700;font-size:.74rem;flex:none}
.stu .nm{font-weight:600}
.tagv{font-family:var(--disp);font-weight:700}
.tagv.ok{color:var(--green)} .tagv.no{color:var(--red)} .tagv.weak{color:var(--warn)}
.mini{font-size:.72rem;color:var(--mute)}

.acts{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}
.acts button{border:1px solid var(--line);background:var(--card);color:var(--ink);font-weight:600;font-size:.82rem;padding:9px 15px;border-radius:10px;transition:all .12s;display:inline-flex;align-items:center;gap:6px}
.acts button:hover{border-color:var(--teal);transform:translateY(-1px)}
.acts .prim{background:var(--teal);color:#fff;border-color:var(--teal)}
.acts .prim:hover{background:var(--teal-bright)}

/* assign form */
.form{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;max-width:760px}
.fld label{display:block;font-size:.7rem;font-weight:700;letter-spacing:.06em;color:var(--mute);margin-bottom:6px}
.fld select,.fld input{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:11px 12px;font-family:var(--ui);font-size:.92rem;background:#fff;color:var(--ink)}
.fld select:focus,.fld input:focus{outline:none;border-color:var(--teal)}
.room{margin-top:16px;background:var(--teal-soft);border:1px dashed var(--teal-bright);border-radius:12px;padding:14px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.room .code{font-family:var(--disp);font-weight:700;font-size:1.5rem;letter-spacing:.08em;color:var(--teal)}
.room .url{font-size:.78rem;color:var(--mute);font-family:var(--disp)}
.room .copy{margin-left:auto;background:var(--teal);color:#fff;border:0;border-radius:9px;font-weight:700;font-size:.8rem;padding:9px 15px}
.room .copy:hover{background:var(--teal-bright)}
.note{font-size:.74rem;color:var(--mute);margin-top:10px;line-height:1.5}
.note b{color:var(--ink)}

/* board (projection) preview */
.board-prev{background:linear-gradient(160deg,#134e4a,#0F766E);color:#fff;border-radius:16px;padding:22px;position:relative;overflow:hidden}
.board-prev::after{content:"";position:absolute;inset:0;background:radial-gradient(500px 240px at 50% -60px,rgba(124,116,255,.35),transparent 70%)}
.board-prev .btop{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}
.board-prev .btop .ttl{font-family:var(--disp);font-weight:700;font-size:1.05rem}
.board-prev .btop .q{font-size:.8rem;color:#C9CCF2}
.board-prev .cards{display:flex;gap:16px;justify-content:center;margin:18px 0;position:relative;z-index:1}
.board-prev .cd{width:84px;height:84px;border-radius:16px;background:rgba(255,255,255,.12);display:grid;place-items:center;font-family:var(--disp);font-weight:700;font-size:2.6rem}
.board-prev .target{text-align:center;font-family:var(--disp);font-weight:700;font-size:1.2rem;position:relative;z-index:1}
.board-prev .target b{font-size:2rem;color:var(--amber)}
.board-prev .prog{display:flex;gap:8px;justify-content:center;margin-top:14px;flex-wrap:wrap;position:relative;z-index:1}
.board-prev .pg{font-size:.8rem;background:rgba(255,255,255,.1);border-radius:999px;padding:5px 12px;font-family:var(--disp);font-weight:700}

.compliance{margin-top:20px;font-size:.72rem;color:var(--mute);text-align:center;line-height:1.5}
.compliance b{color:var(--ink)}

.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;font-weight:600;font-size:.9rem;padding:12px 22px;border-radius:999px;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;z-index:9;box-shadow:0 10px 30px rgba(16,20,42,.35)}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:16px}
.grid2 h3{font-size:.92rem;color:var(--teal);margin:0 0 6px}
.grid2 ul{font-size:.85rem;line-height:1.6}
@media (max-width:720px){.grid2{grid-template-columns:1fr}}
@media (max-width:880px){.shell{grid-template-columns:1fr}.rail{border-right:0;border-bottom:1px solid var(--line);padding-bottom:14px}}
/* Touch target：所有按钮至少 44px（Apple HIG / WCAG 2.5.5）*/
@media (max-width:720px){button.copy,button.prim,button.ghost,button.newc,.tab{min-height:44px;font-size:.95rem;padding:10px 14px}}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* auth overlay (minimal — magic link) */
.auth{position:fixed;inset:0;z-index:20;display:none;align-items:center;justify-content:center;background:rgba(16,20,42,.55);backdrop-filter:blur(4px)}
.auth.on{display:flex}
.auth .box{background:var(--card);border-radius:22px;padding:28px;width:min(380px,90vw);text-align:center;box-shadow:0 24px 60px -20px rgba(0,0,0,.5)}
.auth h2{font-family:var(--disp);font-weight:700;font-size:1.4rem;margin-bottom:6px}
.auth p{color:var(--mute);font-size:.86rem;margin-bottom:16px}
.auth input{border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;width:100%;font-size:1rem;font-family:var(--ui)}
.auth input:focus{outline:none;border-color:var(--teal)}
.auth button{margin-top:12px;width:100%;background:var(--teal);color:#fff;border:0;border-radius:12px;font-weight:700;font-size:.95rem;padding:12px}
.auth button:hover{background:var(--teal-bright)}

/* responsive */
@media (max-width:720px){
  .shell{grid-template-columns:1fr;gap:14px}
  .rail{flex-direction:row;overflow-x:auto;padding-bottom:4px}
  .rail .rl{display:none}
  .cls{width:auto;flex:none}
  .addc{width:auto;flex:none;padding:9px 14px}
  .grid2{grid-template-columns:1fr}
  .form{grid-template-columns:1fr}
  .hd{padding:11px 14px;gap:8px}
}

/* ═══════════ 2026-09-26 老师端落地补充 ═══════════ */

.hd .who{font-size:.8rem;color:var(--mute);font-weight:600}
.hd .ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink);font-weight:700;font-size:.78rem;padding:8px 12px;border-radius:10px}
.hd .ghost:hover{border-color:var(--teal);color:var(--teal)}
.pill.mode{background:rgba(245,158,11,.14);color:var(--warn)}

/* ═══════════ A1 洞察面板：报告首屏先给结论 ═══════════ */
.trend{background:linear-gradient(160deg,#f0fdfa,#F6F3FF);border:1px solid #D9DCF5;border-radius:14px;padding:14px 15px;margin-bottom:16px}
.tr-hl{font-weight:800;font-size:.86rem;color:var(--ink);margin-bottom:8px;display:flex;align-items:center;gap:10px}
.tr-delta{font-size:.74rem;font-weight:800;color:var(--teal);background:#fff;border:1px solid #D9DCF5;border-radius:99px;padding:2px 10px}
.tr-svg{width:100%;height:auto;display:block}
.tr-x{display:flex;justify-content:space-between;font-size:.62rem;color:#6B7290;margin-top:4px}
.skm{display:flex;flex-direction:column;gap:5px}
.skm-row{display:flex;gap:5px;align-items:stretch}
.skm-head{font-size:.66rem;font-weight:800;color:#6B7290}
.skm-code{width:52px;font-weight:800;font-size:.78rem;color:var(--ink);display:flex;align-items:center}
.skm-col{flex:1;text-align:center}
.skm-cell{flex:1;text-align:center;font-weight:800;font-size:.78rem;border-radius:8px;padding:7px 2px}
.skm-cell.good{background:#DFF5EA;color:#0E9F6E}
.skm-cell.mid{background:#FDEFD8;color:#B45309}
.skm-cell.low{background:#FDE3E3;color:#DC2626}
.skm-cell.na{background:#F1F2FA;color:#9AA1B9}
.insights{background:linear-gradient(160deg,#f0fdfa,#F6F3FF);border:1px solid #D9DCF5;border-radius:14px;padding:14px 15px;margin-bottom:16px}
.ins-hl{font-family:var(--disp);font-weight:700;font-size:1.02rem;color:var(--teal);line-height:1.35;margin-bottom:10px}
.ins-item{display:flex;align-items:flex-start;gap:10px;padding:9px 0;border-top:1px solid rgba(15,118,110,.1)}
.ins-item:first-of-type{border-top:0}
.ins-ic{font-size:1.05rem;line-height:1;width:20px;text-align:center;flex:none}
.ins-tx{flex:1;min-width:0}
.ins-t{display:block;font-size:.86rem;font-weight:600;color:var(--ink);line-height:1.35}
.ins-d{display:block;font-size:.72rem;color:var(--mute);margin-top:2px;font-family:var(--disp)}
.ins-act{margin-left:auto;flex:none;align-self:center;background:var(--teal);color:#fff;border:0;border-radius:9px;font-weight:700;font-size:.74rem;padding:7px 12px;transition:background .12s}
.ins-act:hover{background:var(--teal-bright)}
.sev-high{--sev:var(--red)} .sev-med{--sev:var(--warn)} .sev-info{--sev:var(--mute)} .sev-good{--sev:var(--green)}
.ins-item::before{content:"";position:absolute}
.ins-item.sev-high{border-left:3px solid var(--red);padding-left:10px;margin-left:-1px}
.ins-item.sev-med{border-left:3px solid var(--warn);padding-left:10px;margin-left:-1px}
.ins-item.sev-good{border-left:3px solid var(--green);padding-left:10px;margin-left:-1px}
.ins-item.sev-info{border-left:3px solid var(--line);padding-left:10px;margin-left:-1px}

.secttl .caveat{font-family:var(--ui);font-size:.66rem;font-weight:700;color:var(--mute);letter-spacing:.04em}
.secttl .linkbtn{margin-left:auto;background:transparent;border:1.5px solid var(--line);border-radius:9px;font-weight:700;font-size:.72rem;padding:5px 10px;color:var(--teal)}
.secttl .linkbtn:hover{border-color:var(--teal)}

.roster-box{background:var(--teal-soft);border-radius:12px;padding:13px 14px;margin-bottom:12px}
.roster-box label{display:block;font-size:.72rem;color:var(--mute);margin-bottom:7px}
.roster-box textarea{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;font-family:var(--disp);font-size:.9rem;resize:vertical}
.roster-box textarea:focus{outline:none;border-color:var(--teal)}

.qrbox{margin-top:14px;display:flex;justify-content:center;background:#fff;border-radius:12px;padding:12px;border:1px solid var(--line)}
.room .col{display:flex;flex-direction:column;gap:8px;margin-left:auto}

/* Board 实时榜：投影可读性 —— 大字号 + 高对比 */
.lbtbl{margin-top:16px;position:relative;z-index:1;background:rgba(255,255,255,.06);border-radius:14px;padding:10px 12px}
.lbtbl table{width:100%;border-collapse:collapse;color:#fff}
.lbtbl thead th{text-align:left;font-size:.68rem;letter-spacing:.1em;color:#C9CCF2;font-weight:700;padding:6px 8px;border-bottom:1px solid rgba(255,255,255,.18)}
.lbtbl tbody td{padding:7px 8px;font-family:var(--disp);font-size:.95rem;border-bottom:1px solid rgba(255,255,255,.07)}
.lbtbl tbody td.rk{width:32px;color:#C9CCF2;font-weight:700}
.lbtbl tbody tr.live td{color:var(--amber)}
.board-prev .pg.on{background:rgba(22,163,74,.28)}

.auth .errbox{color:var(--red);font-weight:700;margin-top:10px;min-height:1em}
.auth .mini{margin-bottom:8px}
.auth .alt{margin-top:12px}
.auth .alt a{color:var(--teal);font-weight:700}
#turnstile-container{min-height:65px;margin:10px 0;display:flex;align-items:center;justify-content:center}
.auth input + .auth input{margin-top:9px}

/* ── Sign in / Create account 分段切换 ──
   注意必须覆盖上面 `.auth button` 的通配全宽靛蓝样式 */
.auth .auth-tabs{display:flex;gap:4px;background:var(--teal-soft);border:1px solid var(--line);border-radius:12px;padding:4px;margin-bottom:14px}
.auth .atab{margin-top:0;flex:1;width:auto;background:transparent;color:var(--mute);border:0;border-radius:9px;font-weight:700;font-size:.85rem;padding:8px 10px;cursor:pointer;font-family:var(--ui)}
.auth .atab:hover{background:transparent;color:var(--ink)}
.auth .atab.on{background:var(--card);color:var(--teal);box-shadow:0 1px 4px rgba(16,20,42,.12)}
.auth .atab.on:hover{background:var(--card);color:var(--teal)}

/* ── OAuth 快捷登录（Google / GitHub）── */
.auth .auth-div{display:flex;align-items:center;gap:10px;margin:14px 0 4px;color:var(--mute);font-size:.72rem}
.auth .auth-div::before,.auth .auth-div::after{content:'';flex:1;height:1px;background:var(--line)}
.auth .oauth-row{display:flex;gap:8px}
.auth .btn-oauth{margin-top:9px;flex:1;display:flex;align-items:center;justify-content:center;gap:8px;width:auto;background:var(--card);color:var(--ink);border:1.5px solid var(--line);border-radius:12px;font-weight:600;font-size:.9rem;padding:11px;cursor:pointer;font-family:var(--ui)}
.auth .btn-oauth:hover{border-color:var(--teal);background:var(--teal-soft)}

@media(max-width:820px){
  .shell{grid-template-columns:1fr}
  .rail{flex-direction:row;overflow-x:auto;gap:8px}
  .rail .rl{display:none}
  .cls{flex:none}
}

/* ── 作业历史下拉 / 学生下钻 / 班级删除（2026-09-27 审查修复） ── */
.asgsel{max-width:230px;border:1.5px solid #E3E7F0;border-radius:999px;padding:4px 10px;font:inherit;font-size:.72rem;background:#fff;color:var(--ink)}
table tbody tr.clickable{cursor:pointer}
table tbody tr.clickable:hover{background:#F6F7FC}
.smodal{position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;background:rgba(16,20,42,.45)}
.sbox{background:#fff;border-radius:16px;padding:18px;width:min(440px,92vw);max-height:70vh;overflow:auto;box-shadow:0 20px 60px rgba(16,20,42,.3)}
.shead{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;gap:10px}
.shead b{font-family:var(--disp);font-size:1rem;color:var(--ink)}
#sBody table{width:100%;border-collapse:collapse;font-size:.78rem}
#sBody th,#sBody td{text-align:left;padding:6px 8px;border-bottom:1px solid #EEF0F6}
.cls{position:relative}
.cdel{position:absolute;top:8px;right:8px;font-size:.72rem;color:#B6BDD6;line-height:1;padding:2px 5px;border-radius:6px}
.cdel:hover{color:#DC2626;background:#FDECEC}
@media (max-width:720px){.asgsel{max-width:100%}}

/* ── 跨站跳转卡（2026-09-30 三站联动） ── */
.cross{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin-top:8px}
.xcard{display:flex;flex-direction:column;gap:4px;padding:14px;border:1px solid #E3E7F0;border-radius:12px;background:#fff;color:var(--ink);text-decoration:none;transition:.15s}
.xcard:hover{border-color:var(--brand,#7C3AED);box-shadow:0 4px 16px rgba(124,58,237,.12);transform:translateY(-1px)}
.xcard strong{font-family:var(--disp);font-size:.95rem}
.xcard span{font-size:.8rem;color:var(--muted,#6b7280);line-height:1.45}