:root{
  --bg:#f4f8f6; --panel:#ffffff; --ink:#1f2d2b; --muted:#7a8a87;
  --line:#e6efe9; --teal:#2bb6a3; --teal-d:#1f9486; --blue:#4a9ef0;
  --green:#3fbf6f; --red:#ef6b6b; --amber:#f3a93c; --purple:#9b7bf0;
  --shadow:0 6px 22px rgba(31,45,43,.07); --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:15px;line-height:1.55}
.hidden{display:none!important}
.muted{color:var(--muted)}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit;font-size:14px;border:1px solid var(--line);border-radius:10px;padding:9px 11px;background:#fff;color:var(--ink);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--teal)}
button.primary{background:var(--teal);color:#fff;padding:9px 16px;border-radius:10px;font-weight:600;transition:.15s}
button.primary:hover{background:var(--teal-d)}
button.ghost{background:#eef6f3;color:var(--teal-d);padding:8px 14px;border-radius:10px;font-weight:600}
button.ghost:hover{background:#e2f0eb}
button.danger{background:#fdeaea;color:var(--red);padding:6px 12px;border-radius:9px}
.card{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.card h3{font-size:16px;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.spacer{flex:1}
.tag{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px;font-weight:600}
.tag.disc{background:#eafaf3;color:var(--teal-d)}
.tag.study{background:#eaf2fd;color:var(--blue)}
.tag.hyg{background:#eafbf0;color:var(--green)}
.tag.other{background:#f3edfd;color:var(--purple)}
.tag.praise{background:#eafbf0;color:var(--green)}
.tag.criticism{background:#fdeaea;color:var(--red)}
.tag.unknown{background:#fff4e3;color:var(--amber)}
.pos{color:var(--green);font-weight:700}.neg{color:var(--red);font-weight:700}

/* 登录 */
.auth-screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e8f6f1,#eaf3fb)}
.auth-card{background:#fff;border-radius:22px;box-shadow:var(--shadow);padding:34px 30px;width:330px;text-align:center}
.auth-logo{font-size:42px}
.auth-card h1{font-size:21px;margin:8px 0 4px}
.auth-card input{width:100%;margin:16px 0 12px}
.auth-card button{width:100%;padding:11px}
.auth-msg{color:var(--red);min-height:18px;font-size:13px;margin-top:8px}
.auth-hint{margin-top:14px;font-size:12px;color:var(--muted);line-height:1.5}

/* 布局 */
.app{display:flex;min-height:100vh}
.sidebar{width:210px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:18px 12px;position:sticky;top:0;height:100vh}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:17px;padding:6px 8px 18px}
.brand span{color:var(--teal-d)}
.sidebar nav{display:flex;flex-direction:column;gap:4px;flex:1}
.nav-item{text-align:left;padding:11px 14px;border-radius:11px;color:var(--muted);font-size:15px;font-weight:600;transition:.15s}
.nav-item:hover{background:#f1f7f4;color:var(--ink)}
.nav-item.active{background:var(--teal);color:#fff}
.logout{margin-top:8px;padding:10px;border-radius:11px;color:var(--muted);font-weight:600}
.logout:hover{background:#fdeaea;color:var(--red)}
.content{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{display:flex;align-items:center;padding:16px 24px;border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:5}
.topbar #view-title{font-size:19px;font-weight:700}
.sync-badge{margin-left:auto;font-size:12px;color:var(--teal-d);background:#eafaf3;padding:4px 10px;border-radius:20px}
.view{padding:22px 24px 40px;max-width:1100px;width:100%}
.bottom-nav{display:none}

/* 仪表盘 */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:18px}
.stat{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.stat .num{font-size:28px;font-weight:800;color:var(--teal-d)}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:2px}
.section-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.mini-list{list-style:none;font-size:14px}
.mini-list li{padding:7px 0;border-bottom:1px dashed var(--line);display:flex;justify-content:space-between}

/* 学生 */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px;align-items:center}
table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
th{background:#f7faf9;color:var(--muted);font-weight:600;font-size:13px}
tr:hover td{background:#fafdfc}
.stu-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.stu-chip{background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:14px;display:flex;flex-direction:column;gap:4px}
.stu-chip .nm{font-weight:700;font-size:16px}
.stu-chip .gd{font-size:12px;color:var(--muted)}

/* 积分 */
.range-tabs{display:flex;gap:8px;margin-bottom:14px}
.range-tabs button{padding:7px 16px;border-radius:20px;background:#fff;box-shadow:var(--shadow);font-weight:600;color:var(--muted)}
.range-tabs button.active{background:var(--teal);color:#fff}
.rank-list{display:flex;flex-direction:column;gap:8px}
.rank-row{display:flex;align-items:center;gap:12px;background:#fff;border-radius:12px;box-shadow:var(--shadow);padding:10px 14px}
.rank-no{width:28px;height:28px;border-radius:50%;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex:none}
.rank-no.top{background:var(--amber)}
.rank-name{flex:1;font-weight:600}
.rank-pts{font-weight:800;font-size:17px}
.stu-select{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;max-height:240px;overflow:auto;padding:6px;border:1px solid var(--line);border-radius:12px;margin:8px 0}
.stu-select label{display:flex;align-items:center;gap:6px;background:#f7faf9;border-radius:9px;padding:7px 9px;font-size:13px;cursor:pointer}
.stu-select input{width:auto}
.screenshot-card{background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:18px;max-width:420px}
.screenshot-card .hdr{text-align:center;border-bottom:2px solid var(--teal);padding-bottom:10px;margin-bottom:12px}
.screenshot-card .rec{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--line);font-size:14px}
.screenshot-card .tot{text-align:center;font-size:20px;font-weight:800;color:var(--teal-d);margin-top:10px}
.rules-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.rule-card{background:#fff;border-radius:12px;box-shadow:var(--shadow);padding:12px;display:flex;align-items:center;gap:10px}
.rule-card .rl{font-weight:600;flex:1}
.rule-card .rd{font-weight:800}

/* 成绩 */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px;align-items:center}
.chart-box{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-top:14px}
.grade-table td.pts{font-weight:700}
.empty{text-align:center;color:var(--muted);padding:40px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}

/* 作业 */
.fb-card{background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:14px;margin-bottom:12px}
.fb-card .nm{font-weight:700;margin-bottom:6px}
.fb-card textarea{width:100%;min-height:70px;resize:vertical;margin-top:6px}

/* 刷题 */
.training-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.train-card{background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:12px}
.train-card img{width:100%;border-radius:10px;margin-top:8px;cursor:pointer}

/* 弹层图片 */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.8);display:flex;align-items:center;justify-content:center;z-index:50}
.lightbox img{max-width:90%;max-height:90%}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;z-index:40;padding:20px}
.modal .box{background:#fff;border-radius:16px;padding:22px;width:100%;max-width:440px}
.modal .box h3{margin-bottom:14px}
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.form-row label{font-size:13px;color:var(--muted);font-weight:600}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}

/* 移动端 */
@media(max-width:760px){
  .sidebar{display:none}
  .app{flex-direction:column}
  .topbar{padding:13px 16px}
  .view{padding:16px 14px 90px}
  .bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);
    box-shadow:0 -4px 18px rgba(0,0,0,.05);z-index:20}
  .bn-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 0;font-size:11px;color:var(--muted);font-weight:600}
  .bn-item span{font-size:10px}
  .bn-item.active{color:var(--teal-d)}
  .section-grid{grid-template-columns:1fr}
  .split-2{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .filter-bar .form-row,.toolbar .form-row{flex:1}
  .card{padding:14px}
  .range-tabs button{padding:7px 12px;font-size:13px}
}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:11px 22px;border-radius:24px;z-index:60;font-size:14px;box-shadow:var(--shadow)}

/* 积分：快速分值按钮 */
.qbtn{background:#eef6f3;color:var(--teal-d);border:1px solid var(--line);border-radius:10px;padding:7px 12px;font-weight:700;font-size:14px;min-width:42px}
.qbtn:hover{background:var(--teal);color:#fff}
/* 积分：删除单条记录 */
.del-rec{margin-left:6px;background:#fdeaea;color:var(--red);border-radius:50%;width:20px;height:20px;line-height:18px;text-align:center;font-weight:700;font-size:13px;flex:none}
.del-rec:hover{background:var(--red);color:#fff}

/* 通用两列布局（手机端自动单列） */
.split-2{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
.table-wrap{width:100%;overflow-x:auto}

/* 家长周报 */
.wk-card{border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:12px;background:#fff;max-width:460px}
.wk-head{display:flex;align-items:center;gap:10px;border-bottom:2px solid var(--teal);padding-bottom:8px;margin-bottom:8px}
.wk-name{flex:1;font-weight:800;font-size:16px}
.wk-total{font-weight:800;font-size:20px}
.wk-body{font-size:14px}
.wk-rec{display:flex;justify-content:space-between;gap:10px;padding:5px 0;border-bottom:1px dashed var(--line)}
.wk-acts{display:flex;gap:8px;margin-top:10px}
.wk-acts .ghost{flex:1}