:root{
  --bg:linear-gradient(160deg,#eaf7fc 0%,#d9eefb 48%,#e6f3fb 100%); --panel:#ffffff; --ink:#222a35; --sub:#6b7785; --line:#dbe8f3;
  --brand:#2f7fd0; --brand-soft:#e6f3fc; --brand-deep:#1f5f9e;
  --red:#d9453b; --green:#1f9d6b; --amber:#e08a1e; --chip:#e6f0f9;
  --shadow:0 4px 18px rgba(31,95,158,.10);
  --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); background-attachment:fixed; min-height:100vh; color:var(--ink); font-size:15px; line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}

/* ===== 应用级登录 / 注册界面（首页之前） ===== */
body.auth-locked .wrap{display:none}
body.auth-locked #toast{display:none}
body:not(.auth-locked) #authScreen{display:none}
#authScreen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:var(--bg);background-attachment:fixed;z-index:80;padding:20px}
.auth-card{width:100%;max-width:380px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px 24px;text-align:center}
.auth-logo{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,var(--brand),var(--brand-deep));display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.auth-logo svg{width:30px;height:30px;fill:#fff}
.auth-title{font-size:22px;margin:0 0 4px;font-weight:700}
.auth-sub{margin:0 0 18px;color:var(--sub);font-size:13px}
.auth-tabs{display:flex;gap:8px;background:var(--brand-soft);border-radius:10px;padding:4px;margin-bottom:16px}
.auth-tabs button{flex:1;border:none;background:transparent;color:var(--sub);padding:9px 0;border-radius:8px;font-size:14px;font-weight:600}
.auth-tabs button.active{background:var(--panel);color:var(--brand);box-shadow:0 1px 4px rgba(31,95,158,.12)}
.auth-form{display:flex;flex-direction:column;gap:10px}
.auth-form[hidden]{display:none}
.auth-form input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;background:#fafdff;color:var(--ink)}
.auth-form input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.auth-btn{margin-top:4px;padding:12px;border:none;border-radius:10px;background:var(--brand);color:#fff;font-size:15px;font-weight:700}
.auth-btn:active{transform:scale(.99)}
.auth-msg{min-height:18px;margin-top:12px;font-size:13px;color:var(--sub)}
.auth-msg.err{color:var(--red)}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:16px}
.wrap{max-width:1240px;margin:0 auto;padding:14px 16px 40px}
.topbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-deep));display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.logo svg{width:22px;height:22px;fill:#fff}
.titles h1{font-size:19px;margin:0;font-weight:700}
.titles p{margin:0;color:var(--sub);font-size:12.5px}
.spacer{flex:1}
.langbtn{background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:8px 12px;color:var(--ink);font-size:13px;font-weight:600}
.viewbox{display:inline-flex;align-items:center;gap:6px}
.viewbox .lbl{font-size:12.5px;color:var(--sub)}
#viewSel{appearance:none;-webkit-appearance:none;padding:7px 28px 7px 12px;background:var(--brand-soft) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24'><path fill='%232f7fd0' d='M7 10l5 5 5-5z'/></svg>") no-repeat right 8px center}
#viewSel:focus{outline:none;border-color:var(--brand)}
.langbtn:active{transform:scale(.97)}
.sync{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--sub);background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:5px 11px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green)}
.dot.off{background:var(--amber)}
.nav{display:flex;gap:8px;overflow-x:auto;padding:6px 2px 10px;border-bottom:1px solid var(--line);margin-bottom:16px;-webkit-overflow-scrolling:touch}
.nav button{flex:0 0 auto;border:1px solid var(--line);background:var(--panel);color:var(--sub);border-radius:20px;padding:9px 15px;font-size:13.5px;font-weight:600;white-space:nowrap}
.nav button.active{background:var(--brand);border-color:var(--brand);color:#fff}
.grid{display:grid;gap:14px}
.two{grid-template-columns:1.1fr .9fr}
.three{grid-template-columns:repeat(3,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.card h2{font-size:15px;margin:0 0 12px;display:flex;align-items:center;gap:8px}
.card h2 .ic{width:18px;height:18px;fill:var(--brand)}
.card h3{font-size:13px;color:var(--sub);margin:0 0 8px;font-weight:600}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.mini{font-size:12px;color:var(--sub)}
.kpi{display:flex;flex-direction:column;gap:4px;padding:14px;border-radius:12px;background:var(--brand-soft)}
.kpi .v{font-size:26px;font-weight:800;color:var(--brand-deep);line-height:1}
.kpi .l{font-size:12.5px;color:var(--sub)}
  .kpi.warn .v{color:var(--amber)}
  .kpi.bad .v{  color:var(--red)}
  .kpi-sub{font-size:12px;color:var(--sub);margin-top:2px;}
.list{display:flex;flex-direction:column;gap:8px;max-height:420px;overflow:auto}
.item{border:1px solid var(--line);border-radius:11px;padding:11px 12px;background:#fcfdff}
.item .t{font-weight:600;font-size:14px}
.item .m{font-size:12.5px;color:var(--sub);margin-top:3px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.tag{display:inline-flex;align-items:center;font-size:11.5px;padding:2px 8px;border-radius:20px;background:var(--chip);color:var(--sub)}
.tag.red{background:#fdeceb;color:var(--red)}
.tag.green{background:#e7f6ef;color:var(--green)}
.tag.amber{background:#fdf2e2;color:var(--amber)}
.tag.blue{background:var(--brand-soft);color:var(--brand-deep)}
.overdue{border-color:var(--red);background:#fff6f5}
.btn{background:var(--brand);color:#fff;border:none;border-radius:9px;padding:9px 14px;font-size:13.5px;font-weight:600}
.btn:active{transform:scale(.98)}
.btn.ghost{background:var(--panel);color:var(--brand);border:1px solid var(--brand)}
.btn.sm{padding:6px 10px;font-size:12.5px}
.btn.gray{background:var(--chip);color:var(--ink)}
.btn.danger{background:#e5484d;color:#fff}
.btn.danger:hover{background:#c93b40}
label.fld{display:flex;flex-direction:column;gap:5px;font-size:12.5px;color:var(--sub);font-weight:600}
input.ctl,select.ctl,textarea.ctl{width:100%;border:1px solid var(--line);border-radius:9px;padding:10px 11px;background:#fff;color:var(--ink)}
input.ctl:focus,select.ctl:focus,textarea.ctl:focus{outline:none;border-color:var(--brand)}
.controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.controls .fld{flex:1;min-width:130px}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
th{color:var(--sub);font-weight:600;font-size:12px;background:#fafcff;position:sticky;top:0}
tbody tr:hover{background:#f7faff}
td.ro{color:var(--ink)}
.search{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:12px}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.chip-btn{border:1px solid var(--line);background:#fff;border-radius:18px;padding:6px 12px;font-size:12.5px;color:var(--sub)}
.chip-btn.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.stu{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:11px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--brand-soft);color:var(--brand-deep);display:flex;align-items:center;justify-content:center;font-weight:700;flex:0 0 auto}
.notice{background:#fff8e8;border:1px solid #f3e0b6;color:#8a6300;border-radius:10px;padding:10px 12px;font-size:12.5px;margin-bottom:12px}
.bignum{font-size:30px;font-weight:800}
.empty{color:var(--sub);font-size:13px;text-align:center;padding:20px}
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);background:#222a35;color:#fff;padding:11px 18px;border-radius:10px;font-size:13.5px;opacity:0;transition:opacity .25s;pointer-events:none;z-index:50}
.toast.show{opacity:1}
.modal-mask{position:fixed;inset:0;background:rgba(20,30,45,.45);display:none;align-items:center;justify-content:center;z-index:90;padding:18px}
.modal-mask.show{display:flex}
.modal{background:#fff;border-radius:16px;width:100%;max-width:440px;max-height:88vh;overflow:auto;padding:18px}
/* 学生下拉建议框：原生 datalist 在 overflow:auto 的弹窗内定位会飘到很远，改用紧贴输入框的自定义下拉 */
.stu-ddw{position:relative}
.stu-ddl{position:absolute;left:0;right:0;top:100%;margin-top:4px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 26px rgba(20,30,45,.16);max-height:170px;overflow:auto;z-index:5;display:none}
.stu-ddl.show{display:block}
.stu-ddi{padding:8px 10px;font-size:13.5px;color:var(--ink);cursor:pointer}
.stu-ddi:hover{background:#f2f6fb}
.stu-ddi.mut{color:var(--sub);cursor:default}
.stu-ddi.mut:hover{background:transparent}
.stu-ddi.on{background:#eaf3ff;color:var(--brand);font-weight:600}
.stu-ddi.cur{background:#dcecff;color:var(--brand);font-weight:600;box-shadow:inset 3px 0 0 var(--brand)}
.stu-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.stu-chip{display:inline-block;padding:3px 8px;border-radius:999px;background:#eaf3ff;color:var(--brand);border:1px solid #cfe2fb;font-size:12.5px;cursor:pointer;user-select:none}
.stu-chip:hover{background:#d8e9ff}
.stu-chip.mut{background:#f2f4f7;color:var(--sub);border-color:var(--line);cursor:default}
.stu-chip.mut:hover{background:#f2f4f7}
.modal h3{margin:0 0 12px;font-size:16px}
.stu-pick{max-height:300px;overflow:auto;display:flex;flex-direction:column;gap:7px;margin:10px 0}
.stu-pick .stu{cursor:pointer}
.stu-pick .stu.sel{background:var(--brand-soft);border-color:var(--brand)}
.legend{font-size:12px;color:var(--sub);margin-top:8px}
.skel{color:var(--sub);font-size:13px;padding:16px;text-align:center}
@media(max-width:860px){
  .two,.three{grid-template-columns:1fr}
  .wrap{padding:12px 12px 36px}
  .kpi .v{font-size:22px}
  body{font-size:14px}
}

.schedule-wrap{width:100%;overflow:auto;}
.schedule-grid{display:grid;grid-template-columns:60px repeat(7,1fr);gap:4px;min-width:760px;position:relative;}
.sch-cell{border:1px solid var(--line);border-radius:6px;min-height:52px;background:#fcfdff;font-size:12px;padding:4px;}
.sch-head{text-align:center;background:#f7faff;font-weight:600;color:var(--sub);min-height:auto;padding:6px 4px;}
.sch-dow{font-size:12px;font-weight:600;color:var(--ink)}
.sch-date{font-size:11px;color:var(--sub);margin-top:2px}
.sch-time{text-align:center;color:var(--sub);font-size:11px;display:flex;align-items:center;justify-content:center;background:#fff;}
.sch-slot{position:relative;}
.sch-block{background:var(--brand-soft);border-left:3px solid var(--brand);border-radius:5px;padding:4px 5px;color:var(--brand-deep);font-size:11px;line-height:1.35;overflow:hidden;}
.sch-subj{font-weight:700;}
.sch-meta{color:var(--sub);font-size:10px;}
.sch-info{margin-top:1px;}
.warn-box{margin-top:6px;background:#fff4e6;border:1px solid #ffd9a0;border-radius:8px;padding:10px;color:#a35a00;font-size:13px;line-height:1.5;}
.warn-btn{background:#e23c3c;color:#fff;border:none;}
.warn-btn:hover{background:#c62828;}
.up-btn{background:#2f8f5b;color:#fff;border:none;}
.up-btn:hover{background:#26774b;}
.down-btn{background:#c7902a;color:#fff;border:none;}
.down-btn:hover{background:#a9761f;}
.op-cell{display:flex;flex-wrap:wrap;gap:6px;}
@media(max-width:860px){
  .schedule-grid{grid-template-columns:44px repeat(7,minmax(90px,1fr));}
  .sch-block{font-size:10px;}
}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:20px;overflow:hidden;background:var(--panel)}
.seg-btn{border:none;background:var(--panel);color:var(--sub);padding:8px 15px;font-size:13px;font-weight:600}
.seg-btn.active{background:var(--brand);color:#fff}
.month-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;min-width:760px}
.month-grid .sch-head{background:#f7faff;font-weight:600;color:var(--sub);text-align:center;padding:6px 4px}
.day-cell{border:1px solid var(--line);border-radius:6px;min-height:64px;background:#fcfdff;font-size:12px;padding:4px}
.day-num{font-size:12px;color:var(--sub);margin-bottom:3px;display:flex;flex-direction:column;align-items:center;gap:2px}
.day-dots{display:flex;flex-wrap:wrap;justify-content:center;gap:2px;line-height:1}
.dot-mark{width:5px;height:5px;border-radius:50%;background:var(--brand);display:inline-block}
.day-chip{font-size:11px;background:var(--brand-soft);border-left:3px solid var(--brand);border-radius:5px;padding:3px 5px;margin-top:3px;color:var(--brand-deep);overflow:hidden}
.year-card .bignum{color:var(--brand-deep)}
.sch-head-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.sch-head-row h2{flex:1}
.sch-head-right{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.stat-sec{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat-title{font-weight:600;color:var(--brand-deep);margin-bottom:8px;font-size:14px}
.stat-big{margin-bottom:10px;font-size:14px;color:var(--sub)}
.stat-big b{font-size:22px;color:var(--brand-deep)}
.stat-tbl{width:100%;border-collapse:collapse;font-size:13px}
.stat-tbl th{text-align:left;color:var(--sub);font-weight:600;padding:4px 6px;border-bottom:1px solid var(--line)}
.stat-tbl td{padding:4px 6px;border-bottom:1px solid var(--line)}
.stat-tbl td.num{text-align:right;font-weight:600;color:var(--brand-deep)}