/* 登录页 / 教师首页 / 管理后台 */

/* ---------- 登录 ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px}
.login-card{width:min(380px,100%);padding:30px 28px 26px}
.login-brand{display:flex;align-items:center;gap:11px;font-size:20px;font-weight:700;letter-spacing:.5px}
.login-brand .lg{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,#8b6bf5,#5f8cf8);box-shadow:0 4px 14px rgba(123,92,240,.5)}
.login-brand .lg svg{width:20px;height:20px}
.login-sub{font-size:12.5px;color:var(--ink3);margin:6px 0 22px}
.login-btn{width:100%;padding:10px 16px;font-size:14px;margin-top:10px;letter-spacing:4px}
.login-card .ferr{min-height:18px}

/* ---------- 顶栏 ---------- */
.hbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:14px;padding:0 20px;height:56px;
  background:rgba(30,26,62,.82);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}
.hnav{display:flex;gap:4px;min-width:0;overflow-x:auto;scrollbar-width:none}
.hnav::-webkit-scrollbar{display:none}
.hnav a{font-size:13px;color:var(--ink3);padding:6px 13px;border-radius:9px;text-decoration:none;white-space:nowrap;transition:.15s}
.hnav a:hover{color:var(--ink);background:rgba(255,255,255,.06)}
.hnav a.on{color:#fff;background:rgba(255,255,255,.1);box-shadow:inset 0 0 0 1px var(--line2)}
.hbar .ext{font-size:12.5px;color:var(--ink2);text-decoration:none;border:1px solid var(--line2);border-radius:9px;padding:5px 12px;white-space:nowrap}
.hbar .ext:hover{color:#fff;background:rgba(255,255,255,.08)}

/* ---------- 页面 ---------- */
.hpage{max-width:1180px;margin:0 auto;padding:22px 20px 60px}
.hhead{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}
.hhead h2{margin:0;font-size:18px;font-weight:600;letter-spacing:.5px}
.hhead .sp{flex:1}
.hpanel{padding:16px 18px;margin-bottom:16px}
.hgroup{margin-bottom:22px}
.hgroup>.gt{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink3);margin-bottom:10px;letter-spacing:.5px}
.hgroup>.gt .n{font:600 10.5px/1 var(--mono);color:var(--pri3);background:var(--pri-dim);border:1px solid var(--pri-line);border-radius:20px;padding:2px 7px}

/* 课堂卡片 */
.lcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.lcard{background:var(--pane2);border:1px solid var(--line);border-radius:var(--r2);padding:14px 16px;display:flex;flex-direction:column;gap:8px;transition:.16s}
.lcard:hover{background:rgba(255,255,255,.07);border-color:var(--line2)}
.lcard.live{border-color:rgba(47,211,154,.45);box-shadow:0 0 0 1px rgba(47,211,154,.15) inset}
.lcard .tt{font-size:14.5px;font-weight:600;color:#fff;display:flex;align-items:center;gap:8px}
.lcard .tt .t0{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lcard .mt{font-size:12px;color:var(--ink3);display:flex;flex-wrap:wrap;gap:4px 12px}
.lcard .ft{display:flex;align-items:center;gap:8px;margin-top:4px}
.lcard .ft .sp{flex:1}

/* 空状态 */
.hempty{padding:46px 16px;text-align:center;color:var(--ink3);font-size:13px}
.hempty .big{font-size:32px;opacity:.6;margin-bottom:10px}
.hempty .t{color:var(--ink2);font-size:14.5px;margin-bottom:14px}
.hempty .inline{justify-content:center}

/* 课程 / 章节 */
.hcourse{background:var(--pane2);border:1px solid var(--line);border-radius:var(--r2);margin-bottom:12px;overflow:hidden}
.hcourse .ch0{display:flex;align-items:center;gap:10px;padding:13px 16px;cursor:pointer}
.hcourse .ch0:hover{background:rgba(255,255,255,.04)}
.hcourse .ch0 .nm{font-size:14.5px;font-weight:600;color:#fff}
.hcourse .ch0 .ds{font-size:12px;color:var(--ink3);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hcourse .ch0 .arr{color:var(--ink3);transition:transform .2s}
.hcourse.open .ch0 .arr{transform:rotate(90deg)}
.hcourse .chs{display:none;border-top:1px solid var(--line);padding:10px 16px 14px}
.hcourse.open .chs{display:block}
.chap{display:flex;align-items:flex-start;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.chap:last-of-type{border-bottom:0}
.chap .no{flex:0 0 26px;font:600 11.5px/1.9 var(--mono);color:var(--pri3)}
.chap .mid{flex:1;min-width:0}
.chap .nm{font-size:13.5px;color:#fff}
.kps{display:flex;flex-wrap:wrap;gap:5px;margin-top:5px}
.kp{font-size:11px;color:var(--cy);background:var(--cy-dim);border:1px solid rgba(73,210,230,.3);border-radius:20px;padding:0 8px}

/* 表格容器 */
.tbl-wrap{overflow-x:auto}
table.dt td .acts{display:flex;gap:6px;justify-content:flex-end;flex-wrap:wrap}

/* 题库 */
.qitem{background:var(--pane2);border:1px solid var(--line);border-radius:var(--r2);padding:12px 14px;margin-bottom:9px}
.qitem .qh{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:6px}
.qitem .stem{font-size:13.5px;color:#fff;white-space:pre-wrap;line-height:1.7}
.qitem .ops{display:flex;flex-direction:column;gap:2px;margin-top:6px;font-size:12.5px;color:var(--ink2)}
.qitem .ops .on{color:var(--ok)}
.qitem .ans{margin-top:6px;font-size:12px;color:var(--ink3)}
.qitem .ans b{color:var(--ok);font-weight:500}

/* 筛选栏 */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.filters .fin{width:auto;min-width:150px;flex:0 1 220px}

/* 管理后台概览 */
.ov{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px;margin-bottom:16px}
.ov .kpi .v{font-size:20px}
.aibox{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:12.5px;color:var(--ink2)}
.aibox b{font-family:var(--mono);font-weight:600}
.pager{display:flex;align-items:center;justify-content:flex-end;gap:8px;margin-top:12px;font-size:12px;color:var(--ink3)}

/* 导入结果 */
.imp-res{margin-top:12px;display:flex;flex-direction:column;gap:6px}
textarea.fin.big{min-height:180px;font-family:var(--mono);font-size:12.5px}

@media (max-width:720px){
  .hbar{padding:0 12px;gap:8px}
  .hbar .brand .v,.hbar .brand .brand-tx,.hbar .tdiv{display:none}
  .hbar .who span:not(.av){display:none}
  .hbar .ext{padding:4px 9px;font-size:12px}
  .hpage{padding:16px 16px 50px}
  .lcards{grid-template-columns:1fr}
  .kpis{grid-template-columns:repeat(2,1fr)}
}
a.btn{text-decoration:none}
.hbar .who{white-space:nowrap;flex:0 0 auto}