*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#f4f6fb;--panel:#fff;--ink:#0f172a;--muted:#64748b;--line:#e6eaf2;
  --brand:#4f46e5;--brand2:#7c3aed;--brand-soft:#eef2ff;
  --green:#15803d;--green-bg:#e8f7ee;
  --amber:#b45309;--amber-bg:#fef4d8;
  --blue:#1d4ed8;--blue-bg:#e6efff;
  --red:#b91c1c;--red-bg:#fde8e8;
  --orange:#c2410c;--orange-bg:#ffeddd;
  --gray:#64748b;--gray-bg:#f1f5f9;
  --radius:14px;--shadow:0 10px 30px rgba(15,23,42,.08);
}
html{font-size:15px}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
.hidden{display:none !important}
.muted{color:var(--muted)}
.small{font-size:.8rem}
.hint{color:var(--muted);font-size:.76rem;line-height:1.8;margin-top:8px}
.link{color:var(--brand);cursor:pointer;font-size:.85rem}
.count{color:var(--muted);font-weight:500;font-size:.76rem}

/* top */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:14px;padding:9px 18px;background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:800}
.brand .logo{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;color:#fff;font-size:17px;box-shadow:0 4px 10px rgba(79,70,229,.35);flex:0 0 auto}
.brand b{display:block;line-height:1.15;font-size:1rem}
.brand small{display:block;font-weight:500;font-size:.68rem;color:var(--muted)}
.tabs{display:flex;gap:3px;background:#eef1f7;border-radius:12px;padding:4px;overflow:auto;max-width:100%}
.tab{border:0;background:transparent;padding:7px 14px;border-radius:9px;color:#526077;font-size:.88rem;white-space:nowrap}
.tab:hover{color:var(--ink)}
.tab.active{background:#fff;color:var(--brand);font-weight:700;box-shadow:0 1px 4px rgba(15,23,42,.12)}
.top-right{margin-left:auto;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.top-right form{margin:0}
.main{max-width:1180px;margin:0 auto;padding:18px 18px 90px}
.main.narrow{max-width:820px}

/* generic */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:4px 0 16px;flex-wrap:wrap}
.page-head h1{margin:0;font-size:1.35rem}
.page-head p{margin:4px 0 0;color:var(--muted);font-size:.84rem}
.row-actions{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 2px rgba(15,23,42,.03)}
.card-pad{padding:16px}
.section-title{font-size:.95rem;font-weight:800;margin:18px 0 10px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.form-stack{display:flex;flex-direction:column;gap:10px}
.form-row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.form-row .grow{flex:1 1 180px}
.form-actions{display:flex;gap:8px;align-items:center;padding-bottom:1px}
.field{display:block;font-size:.82rem;color:#475569}
.field>span{display:block;margin-bottom:5px;font-weight:600;color:#334155}
input[type=text],input[type=password],input[type=date],input[type=time],input[type=number],input[type=search],select,textarea{border:1px solid var(--line);border-radius:9px;padding:8px 10px;background:#fff;outline:none;width:100%}
input:focus,select:focus,textarea:focus{border-color:#a5b4fc;box-shadow:0 0 0 3px #e0e7ff}
textarea{resize:vertical;min-height:70px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 14px;cursor:pointer;font-size:.86rem;white-space:nowrap;transition:.15s;color:var(--ink)}
.btn:hover{border-color:#c7cede;background:#fafbff}
.btn.primary{background:linear-gradient(135deg,var(--brand),#6d5ce7);color:#fff;border-color:transparent;box-shadow:0 4px 12px rgba(79,70,229,.25)}
.btn.danger{color:var(--red);border-color:#f3c6c6;background:#fff7f7}
.btn.ghost{background:#f8fafc}
.btn.sm{padding:5px 9px;font-size:.78rem;border-radius:8px}
.btn.block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary.danger{background:#fff;color:var(--red);border-color:#f3c6c6;box-shadow:none}
.mini{border:1px solid var(--line);background:#fff;border-radius:7px;font-size:.72rem;padding:3px 7px;cursor:pointer;color:#475569}
.mini:hover{background:var(--brand-soft);border-color:#c7d2fe;color:var(--brand)}
.row-actions form,.tbl form{display:inline}
.empty{text-align:center;padding:36px 18px;color:var(--muted)}
.empty .empty-icon{font-size:2.4rem;margin-bottom:8px}
.empty h3{margin:0 0 6px;color:#334155}
.empty p{margin:0 0 12px;font-size:.86rem}
.empty.small{padding:18px}
.empty.small .empty-icon{font-size:1.6rem}

/* flash / badge / chip */
.flash-wrap{max-width:1180px;margin:10px auto 0;padding:0 18px}
.flash{padding:10px 14px;border-radius:10px;font-size:.85rem;line-height:1.6;background:var(--green-bg);color:var(--green);border:1px solid #c9ecd5}
.flash.err{background:var(--red-bg);color:var(--red);border-color:#f3cccc}
.flash.warn{background:var(--amber-bg);color:var(--amber);border-color:#f3dfa4}
.badge{display:inline-flex;align-items:center;font-size:.72rem;padding:3px 8px;border-radius:999px;background:var(--gray-bg);color:var(--gray);font-weight:600;white-space:nowrap}
.badge.blue{background:var(--brand-soft);color:var(--brand)}
.badge.live{background:var(--green-bg);color:var(--green)}
.badge.warn{background:var(--amber-bg);color:var(--amber)}
.chip{font-size:.72rem;padding:2px 8px;border-radius:999px;font-weight:700;white-space:nowrap;background:var(--gray-bg);color:var(--gray)}
.chip.green{background:var(--green-bg);color:var(--green)}
.chip.amber{background:var(--amber-bg);color:var(--amber)}
.chip.blue{background:var(--blue-bg);color:var(--blue)}
.chip.red{background:var(--red-bg);color:var(--red)}
.chip.orange{background:var(--orange-bg);color:var(--orange)}
.chip.gray{background:var(--gray-bg);color:var(--gray)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(115px,1fr));gap:9px;margin:12px 0}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:11px 13px;cursor:pointer;transition:.15s}
.stat:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.stat .num{font-size:1.65rem;font-weight:800;line-height:1.1}
.stat .lbl{font-size:.74rem;color:var(--muted);margin-top:3px}
.stat[data-tone=green] .num{color:var(--green)}
.stat[data-tone=amber] .num{color:var(--amber)}
.stat[data-tone=blue] .num{color:var(--blue)}
.stat[data-tone=red] .num{color:var(--red)}
.stat[data-tone=orange] .num{color:var(--orange)}
.stat[data-tone=gray] .num{color:#94a3b8}

/* tables */
.table-wrap{overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}
.tbl{width:100%;border-collapse:collapse;font-size:.84rem;min-width:640px}
.tbl th{background:#f8fafc;text-align:left;padding:9px 11px;font-size:.73rem;color:#64748b;white-space:nowrap;border-bottom:1px solid var(--line);font-weight:700}
.tbl td{padding:9px 11px;border-bottom:1px solid #eef2f8;vertical-align:middle}
.tbl tr:last-child td{border-bottom:0}
.tbl tr:hover td{background:#fafbff}
.row-dim{opacity:.55}
.tbl .muted{font-size:.76rem}

/* class cards */
.class-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin-top:12px}
.class-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;transition:.15s;color:var(--ink)}
.class-card:hover{box-shadow:var(--shadow);transform:translateY(-1px)}
.class-card.static{cursor:default}
.cc-title{font-weight:800;font-size:1.05rem}
.cc-meta{color:var(--muted);font-size:.8rem;margin-top:5px;line-height:1.7}
.cc-enter{display:inline-block;margin-top:10px;color:var(--brand);font-size:.84rem;font-weight:700}
.cc-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}

/* landing/login */
.hero{padding:34px 4px 18px}
.hero h1{margin:0 0 8px;font-size:1.9rem;letter-spacing:.5px}
.hero p{margin:0;color:var(--muted);font-size:.92rem;line-height:1.9}
.login-card{max-width:430px;margin:7vh auto 0;padding:26px 24px;text-align:center}
.login-card h2{margin:6px 0 6px;font-size:1.25rem}
.login-icon{font-size:2rem}
.login-card .form-stack{text-align:left;margin-top:16px}
.login-card .hint{margin-top:14px}
.narrow .card{margin-top:14px}

/* event cards */
.event-grid{display:grid;gap:10px}
.event-card{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;flex-wrap:wrap}
.event-icon{width:44px;height:44px;border-radius:12px;background:var(--brand-soft);display:grid;place-items:center;font-size:21px;flex:0 0 auto}
.event-main{flex:1;min-width:180px}
.event-name{font-weight:700}
.event-meta{font-size:.78rem;color:var(--muted);margin-top:4px;line-height:1.6}
.event-side{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.event-side form{margin:0}
.list{display:flex;flex-direction:column;gap:0}
.list-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px dashed #eef2f8;flex-wrap:wrap}
.list-row:last-child{border-bottom:0}

/* filters and tabs */
.filters{display:flex;gap:8px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px;margin-bottom:12px}
.filters label{font-size:.78rem;color:var(--muted);display:flex;align-items:center;gap:6px}
.filters input[type=date],.filters select,.filters input[type=search]{width:auto;min-width:120px;padding:6px 8px;font-size:.82rem}
.tabs-line{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 12px}
.tab-line{padding:7px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.84rem;color:#475569;display:inline-flex;gap:7px;align-items:center}
.tab-line.active{background:var(--brand-soft);border-color:#c7d2fe;color:var(--brand);font-weight:700}
.tab-line .count{background:rgba(0,0,0,.05);padding:1px 7px;border-radius:999px;font-size:.72rem}

/* rollcall */
.session-head{display:flex;justify-content:space-between;gap:14px;padding:16px 18px;flex-wrap:wrap}
.sh-title{font-size:1.25rem;font-weight:800;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.sh-sub{color:var(--muted);font-size:.82rem;margin-top:6px;line-height:1.8}
.sh-right{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.countdown{font-size:.9rem;font-weight:700;padding:7px 12px;border-radius:999px;background:var(--gray-bg);color:var(--gray);white-space:nowrap}
.countdown[data-tone=live]{background:var(--green-bg);color:var(--green)}
.countdown[data-tone=wait]{background:var(--amber-bg);color:var(--amber)}
.countdown[data-tone=done]{background:var(--gray-bg);color:#94a3b8}
.notice{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border:1px solid #ddd6fe;border-radius:12px;padding:11px 14px;font-size:.84rem;color:#4338ca;margin:12px 0}
.session-toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:12px 0}
.search{flex:1;min-width:180px;max-width:300px;position:relative}
.search input{padding-left:10px}
.toolbar-actions{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.student-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:9px}
.scard{background:#fff;border:1px solid var(--line);border-radius:13px;padding:10px 11px 8px;cursor:pointer;display:flex;flex-direction:column;gap:3px;min-height:106px;transition:.12s;user-select:none}
.scard:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.scard:active{transform:scale(.985)}
.scard[data-status=onTime]{background:#f6fdf8;border-color:#c9ecd5}
.scard[data-status=late]{background:#fffcf2;border-color:#f3dfa4}
.scard[data-status=leave]{background:#f7faff;border-color:#c9d9fb}
.scard[data-status=absent],.scard[data-status=notReturned]{background:#fff8f8;border-color:#f3cccc}
.scard[data-status=early]{background:#fff9f4;border-color:#f6d3b8}
.scard-head{display:flex;align-items:center;justify-content:space-between;gap:6px}
.sname{font-weight:700;font-size:1.02rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.scard-sub{font-size:.72rem;color:var(--muted)}
.scard-time{font-size:.74rem;color:#475569;min-height:1.1em}
.scard-note{font-size:.71rem;color:#92400e;background:#fff7ed;border:1px solid #fde68a;border-radius:6px;padding:2px 6px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;line-height:1.35}
.scard-actions{display:flex;gap:4px;flex-wrap:wrap;margin-top:auto;padding-top:6px}

/* pickers */
.stu-picker{max-height:240px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:6px 10px;background:#fbfcfe}
.checkline{display:flex;align-items:center;gap:7px;font-size:.85rem;margin:4px 0;cursor:pointer}
.checkline input{width:auto}
.check-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:4px}
.field>span+.check-row{margin-top:6px}

/* sheets */
.sheet-layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:rgba(15,23,42,.5);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:flex;align-items:center;justify-content:center;padding:16px}
.sheet-box{background:#fff;border-radius:18px;width:560px;max-width:100%;max-height:88vh;display:flex;flex-direction:column;box-shadow:0 30px 80px rgba(15,23,42,.35);overflow:hidden}
.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);font-size:1rem}
.sheet-x{border:0;background:#f1f5f9;width:30px;height:30px;border-radius:50%;cursor:pointer;color:#64748b}
.sheet-body{padding:16px 18px;overflow:auto}
.sheet-foot{padding:12px 18px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px;background:#fbfcfe}
.confirm-box{width:380px}
.confirm-msg{white-space:pre-wrap;line-height:1.8;font-size:.9rem}
.sheet-table{max-height:50vh;overflow:auto}
.sheet-table .tbl{min-width:420px}

/* toast */
.toast-root{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:300;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:rgba(15,23,42,.94);color:#fff;padding:9px 16px;border-radius:999px;font-size:.84rem;box-shadow:var(--shadow);animation:pop .18s ease;max-width:90vw}
.toast.ok{background:rgba(21,128,61,.95)}
.toast.warn{background:rgba(180,83,9,.95)}
.toast.err{background:rgba(185,28,28,.95)}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* responsive */
@media(max-width:720px){
  .topbar{gap:8px;padding:8px 12px}
  .brand small{display:none}
  .tabs{order:3;width:100%;justify-content:space-between}
  .tab{flex:1;text-align:center;padding:7px 4px;font-size:.82rem}
  .top-right{order:2;margin-left:auto}
  .main{padding:12px 12px 80px}
  .page-head h1{font-size:1.2rem}
  .grid2,.grid3{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(3,1fr);gap:7px}
  .stat{padding:9px 10px}
  .stat .num{font-size:1.3rem}
  .stat .lbl{font-size:.68rem}
  .student-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .scard{padding:9px}
  .session-toolbar .search{flex:1 1 100%;max-width:none}
  .toolbar-actions{margin-left:0;width:100%}
  .toolbar-actions .btn{flex:1}
  .event-card{padding:12px;gap:10px;align-items:flex-start}
  .event-icon{width:38px;height:38px;font-size:18px}
  .event-main{flex:1 1 calc(100% - 50px);min-width:0}
  .event-side{width:100%;justify-content:flex-end;padding-left:48px}
  .filters label{flex:1 1 100%;justify-content:space-between}
  .filters input[type=date],.filters select,.filters input[type=search]{flex:1;min-width:0}
  .sheet-box{max-height:92vh}
  .sheet-body{padding:14px}
  .sheet-head,.sheet-foot{padding:12px 14px}
  .login-card{margin-top:3vh;padding:20px 16px}
  .hero{padding:20px 2px 10px}
  .hero h1{font-size:1.55rem}
  .flash-wrap{padding:0 12px}
  .list-row{align-items:flex-start}
}

/* 手机端表格转卡片 */
@media(max-width:720px){
  .mobile-cards-wrap{background:transparent;border:0;overflow:visible}
  .mobile-cards-wrap table{display:block;min-width:0}
  .mobile-cards-wrap thead{display:none}
  .mobile-cards-wrap tbody{display:block}
  .mobile-cards-wrap tr{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:9px}
  .mobile-cards-wrap td{display:flex;align-items:center;justify-content:space-between;gap:12px;border:0;padding:4px 0;width:100%;text-align:right}
  .mobile-cards-wrap td::before{content:attr(data-label);color:var(--muted);font-size:.74rem;font-weight:700;flex:0 0 auto;text-align:left}
  .mobile-cards-wrap td.cell-actions{display:block;border-top:1px dashed #eef2f8;margin-top:6px;padding-top:8px;text-align:right}
  .mobile-cards-wrap td.cell-actions::before{display:none}
  .mobile-cards-wrap td .row-actions{justify-content:flex-end}
  .form-row{flex-direction:column;align-items:stretch}
  .form-row .grow{flex:1 1 auto}
  .form-actions .btn{width:100%}
}
a.plain{color:inherit}

@media(max-width:720px){
  .freq-cards tr{display:grid;grid-template-columns:34px 1fr auto;grid-template-rows:auto auto;gap:2px 8px;padding:10px 12px}
  .freq-cards td{border:0;padding:0;display:block;text-align:left}
  .freq-cards td::before{display:none}
  .freq-cards td[data-label="排名"]{grid-column:1;grid-row:1 / span 2;font-weight:800;color:var(--muted);font-size:1rem;align-self:center}
  .freq-cards td[data-label="学生"]{grid-column:2;grid-row:1}
  .freq-cards td[data-label="学生"] br,.freq-cards td[data-label="学生"] .muted{display:none}
  .freq-cards td[data-label="班级"]{grid-column:2;grid-row:2;font-size:.72rem;color:var(--muted)}
  .freq-cards td[data-label="迟到次数"]{grid-column:3;grid-row:1;justify-self:end}
  .freq-cards td[data-label="旷课/未归次数"]{grid-column:3;grid-row:2;justify-self:end}
  .freq-cards td[data-label="合计"]{display:none}
}