:root{--navy:#17365d;--blue:#216fd4;--blue-soft:#eaf3ff;--ink:#172033;--muted:#667085;--line:#dbe3ef;--bg:#f5f8fc;--card:#fff;--green:#168a55;--green-soft:#e7f6ee;--red:#cf3d47;--red-soft:#fdebed;--orange:#e9931a;--orange-soft:#fff3df;--shadow:0 9px 28px rgba(34,56,86,.09)}
*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}button,input,select,textarea{font:inherit}button{cursor:pointer}
.shell{max-width:1060px;margin:auto;min-height:100vh;padding-bottom:88px}.topbar{position:sticky;top:0;z-index:30;background:linear-gradient(135deg,var(--navy),#245b96);color:#fff;padding:18px 16px 15px;box-shadow:0 4px 16px rgba(0,0,0,.14)}
.toprow{display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{font-size:24px;font-weight:850;letter-spacing:-.02em}.subtitle{font-size:13px;opacity:.9;margin-top:3px}.sync{border:1px solid rgba(255,255,255,.45);background:rgba(255,255,255,.12);color:#fff;border-radius:12px;padding:9px 11px;font-weight:750}
.nav{position:sticky;top:75px;z-index:25;background:#fff;border-bottom:1px solid var(--line);display:flex;gap:7px;overflow:auto;padding:9px 10px}.nav button{border:0;background:#edf2f8;color:#526079;border-radius:11px;padding:10px 13px;font-weight:800;white-space:nowrap}.nav button.active{background:var(--navy);color:#fff}
main{padding:14px}.hero,.card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.hero{padding:18px;margin-bottom:13px}.hero h2,.card h3{margin:0 0 6px}.hero p,.muted{color:var(--muted)}.card{padding:15px;margin-bottom:12px}
.grid{display:grid;gap:12px}.grid.cols{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}.kpi{font-size:30px;font-weight:900;color:var(--navy)}.fieldgrid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
label{display:block;font-size:13px;font-weight:800;color:#4b5870;margin-bottom:6px}select,input[type=text],input[type=url],textarea{width:100%;border:1px solid #cfd9e7;border-radius:12px;background:#fff;padding:10px 11px;color:var(--ink)}textarea{min-height:82px;resize:vertical}
.btn{border:0;border-radius:12px;padding:10px 13px;background:#eaf0f7;color:#31405a;font-weight:800}.btn.primary{background:var(--blue);color:#fff}.btn.green{background:var(--green);color:#fff}.btn.red{background:var(--red);color:#fff}.btn.ghost{background:#fff;border:1px solid var(--line)}.btn.small{padding:7px 9px;font-size:12px}.actions{display:flex;gap:8px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:850;background:var(--blue-soft);color:#1d5ba6;margin:2px}.pill.green{background:var(--green-soft);color:#0b7044}.pill.red{background:var(--red-soft);color:#ae2630}.pill.orange{background:var(--orange-soft);color:#a25f06}
.notice{background:#fff5d9;border:1px solid #efd77b;border-radius:14px;padding:12px;line-height:1.42}.setup{max-width:650px;margin:60px auto;padding:0 14px}.setup .card{padding:22px}.setup h1{margin:0 0 8px}.setup code{word-break:break-all;background:#f1f4f8;padding:2px 5px;border-radius:5px}
.period{border:1px solid var(--line);border-radius:15px;padding:13px;background:#fff}.period.active{border:2px solid #4d88d4}.list{display:grid;gap:8px}.student{display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:#fafcff;border-radius:12px;padding:9px}.student .name{flex:1;font-weight:750}
.group{border:1px solid var(--line);border-radius:14px;padding:12px;background:#fff}.group.selected{border:2px solid var(--blue);background:#fbfdff}.grouphead{display:flex;justify-content:space-between;align-items:center;gap:10px}
.student-tabs{display:flex;gap:8px;overflow:auto;margin-bottom:10px}.student-tabs button{border:1px solid var(--line);border-radius:11px;background:#fff;padding:9px 11px;font-weight:800;white-space:nowrap}.student-tabs button.active{background:var(--navy);color:#fff}
.modegrid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mode{border:2px solid var(--line);border-radius:14px;padding:13px;background:#fff}.mode.sel{border-color:var(--blue);background:var(--blue-soft)}
.checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}.check{display:flex;align-items:flex-start;gap:9px;border:1px solid var(--line);border-radius:12px;background:#fff;padding:10px}.check input{margin-top:3px;transform:scale(1.15)}
.comp{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;padding:12px 0;border-bottom:1px solid #edf1f6}.comp:last-child{border-bottom:0}.ccode{font-weight:900;color:var(--navy)}.cname{font-size:14px;color:#435069;margin-top:2px}
.tri{display:flex;gap:6px}.tri button{width:42px;height:42px;border:0;border-radius:50%;font-size:20px;font-weight:900}.minus{background:var(--red-soft);color:var(--red)}.zero{background:#edf1f6;color:#56627a}.plus{background:var(--green-soft);color:var(--green)}.minus.sel{background:var(--red);color:#fff}.zero.sel{background:#6b7280;color:#fff}.plus.sel{background:var(--green);color:#fff}
.history{border-left:4px solid var(--blue);padding-left:12px;margin:10px 0}.empty{padding:22px;border:1px dashed #cdd7e5;border-radius:14px;text-align:center;color:var(--muted);background:#fff}.loading{padding:36px;text-align:center;color:var(--muted)}
.toast{position:fixed;right:16px;bottom:18px;z-index:99;background:#15243b;color:#fff;padding:11px 14px;border-radius:11px;box-shadow:var(--shadow);opacity:0;transform:translateY(8px);pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:none}.statusdot{display:inline-block;width:9px;height:9px;border-radius:50%;background:#93a4bb;margin-right:6px}.statusdot.ok{background:#22a06b}.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
@media(max-width:700px){.fieldgrid,.modegrid{grid-template-columns:1fr}.comp{grid-template-columns:1fr}main{padding:11px}.nav{top:75px}.grid[style*="grid-template-columns"]{grid-template-columns:1fr!important}}