:root{
  --bg:#f5f7fb; --card:#ffffff; --ink:#1f2430; --sub:#6b7280; --line:#e6e9f0;
  --brand:#4c6fff; --brand-soft:#eef2ff; --ok:#16a34a; --warn:#f59e0b; --run:#ef4444;
  --radius:16px;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;}
.app{max-width:960px;margin:0 auto;padding:22px 18px 60px}
.hidden{display:none !important}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:46px;height:46px;border-radius:14px;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700}
h1{margin:0;font-size:21px}
#subDate{margin:2px 0 0;color:var(--sub);font-size:13px}
.top-right{display:flex;align-items:center;gap:14px}
.prog{text-align:right}
.prog-bar{width:150px;height:8px;background:#e8ebf2;border-radius:99px;overflow:hidden}
.prog-bar i{display:block;height:100%;width:0;background:var(--ok);border-radius:99px;transition:width .4s}
#progText{font-size:12px;color:var(--sub)}

/* tabs */
.tabs{display:flex;gap:6px;margin:20px 0 16px;background:#eaeef6;padding:5px;border-radius:12px}
.tab{flex:1;border:0;background:transparent;padding:10px;border-radius:9px;font-size:15px;
  color:var(--sub);cursor:pointer;font-weight:600}
.tab.active{background:#fff;color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.08)}

/* cards */
.list{display:flex;flex-direction:column;gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 16px 14px;box-shadow:0 1px 3px rgba(16,24,40,.05)}
.card.running{border-color:var(--run);box-shadow:0 0 0 3px rgba(239,68,68,.12)}
.card.done{opacity:.62}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.subj{display:inline-block;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:700;
  background:var(--brand-soft);color:var(--brand)}
.title{margin:8px 0 6px;font-size:17px;font-weight:700;line-height:1.45}
.content{margin:0;color:#374151;font-size:14.5px;line-height:1.7;white-space:pre-wrap}
.meta{margin-top:10px;display:flex;gap:14px;flex-wrap:wrap;color:var(--sub);font-size:12.5px}
.due{color:var(--warn);font-weight:600}
.due.urgent{color:var(--run)}
.photos{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.photos img{width:88px;height:88px;object-fit:cover;border-radius:10px;border:1px solid var(--line);cursor:pointer}

/* actions */
.actions{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}
.timer{font-variant-numeric:tabular-nums;font-size:19px;font-weight:700;min-width:88px}
.timer.run{color:var(--run)}
.btn{border:0;border-radius:11px;padding:10px 18px;font-size:14.5px;font-weight:600;cursor:pointer}
.btn.primary{background:var(--brand);color:#fff}
.btn.ok{background:var(--ok);color:#fff}
.btn.warn{background:#fff;color:var(--warn);border:1px solid #fcd34d}
.btn.ghost{background:#fff;color:var(--sub);border:1px solid var(--line)}
.btn.danger{background:#fff;color:#ef4444;border:1px solid #fecaca}
.btn.danger:hover{background:#fef2f2}
.btn:disabled{opacity:.45;cursor:default}
.note{flex:1;min-width:160px;border:1px solid var(--line);border-radius:11px;padding:9px 12px;font-size:14px}

/* 排序条 */
.sortbar{display:flex;align-items:center;gap:10px;margin-bottom:14px;font-size:13px;color:var(--sub)}
.sortbar select{border:1px solid var(--line);border-radius:10px;padding:7px 10px;font-size:13.5px;
  background:#fff;color:var(--ink);font-family:inherit;cursor:pointer}

/* banner / sections */
.banner{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;padding:13px 16px;
  border-radius:14px;margin-bottom:14px;font-weight:600}
.sec-title{margin:0 0 12px;font-size:15px;color:var(--sub)}
#overdueWrap{margin-top:26px}
h2.sec-title{font-size:15px}

/* stats */
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:16px}
.kpi{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px;text-align:center}
.kpi b{display:block;font-size:24px;margin-bottom:2px}
.kpi span{font-size:12.5px;color:var(--sub)}
.bar-row{display:flex;align-items:center;gap:10px;margin:9px 0}
.bar-row .name{width:64px;font-size:13.5px;flex:none}
.bar-row .track{flex:1;height:14px;background:#f1f3f8;border-radius:99px;overflow:hidden}
.bar-row .track i{display:block;height:100%;background:var(--brand);border-radius:99px}
.bar-row .val{width:78px;text-align:right;font-size:12.5px;color:var(--sub);flex:none}
.week{display:flex;align-items:flex-end;gap:10px;height:150px}
.week .col{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px}
.week .stick{width:100%;background:var(--brand-soft);border-radius:8px;position:relative;min-height:4px}
.week .stick i{position:absolute;left:0;bottom:0;width:100%;background:var(--brand);border-radius:8px}
.week .lb{font-size:11.5px;color:var(--sub)}
.week .vv{font-size:11px;color:var(--sub)}

/* history */
.day{margin-bottom:18px}
.day h3{margin:0 0 8px;font-size:14px;color:var(--sub);font-weight:700}
.hrow{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:11px 14px;margin-bottom:8px}
.hrow .t{flex:1;min-width:0}
.hrow .t b{font-size:14.5px}
.hrow .t p{margin:2px 0 0;font-size:12.5px;color:var(--sub);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hrow .d{font-variant-numeric:tabular-nums;font-weight:700;font-size:15px;color:var(--brand)}

/* lightbox & toast */
.lightbox{position:fixed;inset:0;background:rgba(15,18,26,.86);display:flex;align-items:center;
  justify-content:center;z-index:50;cursor:zoom-out}
.lightbox img{max-width:92%;max-height:92%;border-radius:10px}
.toast{position:fixed;left:50%;bottom:32px;transform:translateX(-50%);background:#1f2430;color:#fff;
  padding:11px 20px;border-radius:12px;font-size:14px;z-index:60}

/* modal：录入线下作业 */
.modal{position:fixed;inset:0;z-index:70;display:flex;align-items:center;justify-content:center}
.modal-mask{position:absolute;inset:0;background:rgba(15,18,26,.5)}
.modal-box{position:relative;width:min(440px,92vw);background:var(--card);border-radius:var(--radius);
  padding:20px;box-shadow:0 12px 40px rgba(16,24,40,.25);max-height:90vh;overflow:auto}
.modal-box .sec-title{margin-top:0}
.field{margin-bottom:13px}
.field label{display:block;font-size:13px;color:var(--sub);margin-bottom:5px;font-weight:600}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:11px;
  padding:10px 12px;font-size:14.5px;font-family:inherit;background:#fff;color:var(--ink)}
.field textarea{resize:vertical}
.field.check label{display:flex;align-items:center;gap:8px;font-size:14.5px;color:var(--ink);font-weight:500}
.field.check input{width:auto}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:6px}

@media (max-width:640px){
  .kpis{grid-template-columns:1fr 1fr}
  .top-right{width:100%;justify-content:space-between}
}