:root{
  --bg:#f4f7fb; --card:#fff; --text:#0f172a; --muted:#64748b; --line:#e2e8f0; --blue:#2563eb;
  --green:#16a34a; --amber:#d97706; --rose:#e11d48; --shadow:0 8px 24px rgba(15,23,42,.05);
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea{font:inherit}
.wrap{max-width:980px;margin:0 auto;padding:14px 12px 90px}
.card{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:16px;margin-bottom:12px}
h1{margin:0;font-size:28px;line-height:1.1}
h2{margin:0;font-size:20px}
.sub{color:var(--muted);margin:8px 0 0;line-height:1.5;font-size:14px}
.top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.iconbtn,.btn,.tab{border:1px solid var(--line);background:#fff;border-radius:16px;padding:12px 14px;font-weight:700;cursor:pointer}
.btn.primary,.tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.row{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center}
.datebox{display:flex;align-items:center;justify-content:center;gap:8px;background:#eff6ff;color:#1d4ed8;border-radius:16px;padding:12px 14px;font-weight:700;text-align:center}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin-top:12px}
.day{border:1px solid var(--line);background:#fff;border-radius:16px;padding:10px 6px;text-align:center;font-size:12px;cursor:pointer}
.day.active{background:#eff6ff;border-color:#93c5fd;color:#1d4ed8}
.day .n{font-size:18px;font-weight:800;margin-top:4px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}
.stat{border-radius:16px;padding:12px 10px;text-align:center;border:1px solid var(--line)}
.stat .num{font-size:22px;font-weight:900}
.stat .lab{font-size:12px;font-weight:700;margin-top:2px}
.s-H{background:#ecfdf5;color:#047857;border-color:#bbf7d0}
.s-S{background:#fffbeb;color:#b45309;border-color:#fde68a}
.s-I{background:#eff6ff;color:#1d4ed8;border-color:#bfdbfe}
.s-A{background:#fff1f2;color:#be123c;border-color:#fecdd3}
.search{display:flex;gap:8px;align-items:center;border:1px solid var(--line);background:#fff;border-radius:16px;padding:12px 14px}
.search input{border:none;outline:none;width:100%;font-size:15px}
.student{background:#f8fafc;border:1px solid var(--line);border-radius:20px;padding:12px;margin-top:10px}
.head{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.name{font-size:15px;font-weight:800;line-height:1.25}
.meta{color:var(--muted);font-size:12px;margin-top:4px}
.badge{border-radius:999px;background:#fff;padding:6px 10px;border:1px solid var(--line);font-size:12px;font-weight:800}
.choices{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}
.choice{padding:10px 8px;border-radius:14px;border:1px solid var(--line);background:#fff;font-weight:800;cursor:pointer;font-size:13px}
.choice.active.H{background:#ecfdf5;color:#047857;border-color:#86efac}
.choice.active.S{background:#fffbeb;color:#b45309;border-color:#fcd34d}
.choice.active.I{background:#eff6ff;color:#1d4ed8;border-color:#93c5fd}
.choice.active.A{background:#fff1f2;color:#be123c;border-color:#fda4af}
.bottom{position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.96);border-top:1px solid var(--line);backdrop-filter:blur(10px)}
.bottom .in{max-width:980px;margin:0 auto;padding:10px 12px;display:flex;gap:10px}
.overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);display:none;align-items:flex-end;justify-content:center;z-index:50}
.sheet{width:min(980px,100%);background:#fff;border-radius:26px 26px 0 0;padding:14px;box-shadow:0 -20px 40px rgba(0,0,0,.18);max-height:92vh;overflow:auto}
.sheetbar{width:56px;height:5px;border-radius:999px;background:#cbd5e1;margin:0 auto 12px}
.sheetgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.full{grid-column:1/-1}
.sheetbtn{border:1px solid var(--line);background:#fff;border-radius:18px;padding:14px;font-weight:800;text-align:center;cursor:pointer}
.sheetbtn.blue{background:var(--blue);color:#fff;border-color:var(--blue)}
.sheetbtn.green{background:#ecfdf5;color:#047857;border-color:#bbf7d0}
.sheetbtn.amber{background:#fffbeb;color:#b45309;border-color:#fde68a}
.sheetbtn.rose{background:#fff1f2;color:#be123c;border-color:#fecdd3}
.small{font-size:12px;color:var(--muted);line-height:1.5}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:16px}
.login-card{width:min(460px,100%);background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);padding:20px}
.field{margin-top:12px}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:8px}
.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);border-radius:16px;padding:13px 14px;outline:none}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tab{padding:10px 12px;border-radius:999px}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.table{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px}
.table th,.table td{border-bottom:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}
.table th{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.kpi{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.kpi .box{border:1px solid var(--line);border-radius:18px;padding:14px;text-align:center;background:#fafcff}
.kpi .box .n{font-size:24px;font-weight:900}
.kpi .box .t{font-size:12px;color:var(--muted);font-weight:700}
@media (max-width:700px){
  h1{font-size:24px}
  .stats,.week,.choices,.sheetgrid,.kpi{gap:6px}
  .choice{font-size:12px;padding:9px 6px}
}