:root{
 --blue:#0b5cab;--blue2:#0a4d91;--teal:#0f8b8d;--green:#18864b;--red:#c83f49;
 --amber:#b7791f;--ink:#17324d;--muted:#6b7c8f;--line:#dfe7ef;--bg:#f4f7fb;--card:#fff;
 --shadow:0 12px 35px rgba(20,50,80,.08);--radius:18px;
}
*{box-sizing:border-box}html{font-size:16px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Poppins,Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;line-height:1.5}
a{color:inherit}.topbar{position:sticky;top:0;z-index:40;height:72px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--teal));color:#fff;font-weight:800}.brand strong{display:block;font-size:1rem}.brand small{display:block;color:var(--muted);font-size:.76rem}.user-chip{text-align:right}.user-chip span{display:block;font-weight:700}.user-chip small{color:var(--muted)}
.side-nav{position:fixed;top:72px;bottom:0;left:0;width:220px;padding:18px 14px;background:#fff;border-right:1px solid var(--line);overflow:auto}.side-nav a{display:block;padding:12px 14px;border-radius:12px;text-decoration:none;margin-bottom:5px;color:#506579;font-weight:600}.side-nav a:hover,.side-nav a.active{background:#eaf3ff;color:var(--blue)}
.app-main{margin-left:220px;padding:28px;max-width:1500px}.public-main{padding:28px;max-width:1450px;margin:auto}
.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:24px}.page-head h1{margin:0;font-size:clamp(1.65rem,3vw,2.25rem);line-height:1.2}.page-head p{margin:.4rem 0 0;color:var(--muted)}.page-actions{display:flex;gap:10px;flex-wrap:wrap}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.card h2,.card h3{margin-top:0}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.kpi{display:flex;align-items:center;justify-content:space-between;min-height:135px}.kpi .value{font-size:2.2rem;font-weight:800;line-height:1}.kpi .label{font-weight:700;margin-top:8px}.kpi small{color:var(--muted)}.kpi-icon{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;background:#edf5ff;font-size:1.5rem}
.kpi.green .kpi-icon{background:#e8f7ef}.kpi.red .kpi-icon{background:#fff0f1}.kpi.amber .kpi-icon{background:#fff7e7}
.stat-table{width:100%;border-collapse:collapse}.stat-table th,.stat-table td{padding:13px 12px;border-bottom:1px solid var(--line);text-align:left}.stat-table th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);background:#f8fafc}.stat-table td.num,.stat-table th.num{text-align:center;font-variant-numeric:tabular-nums}.stat-table tr:last-child td{border-bottom:0}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}
.btn{appearance:none;border:0;border-radius:12px;padding:11px 16px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#eef3f8;color:var(--ink)}.btn:hover{filter:brightness(.98)}.btn-primary{background:var(--blue);color:#fff}.btn-success{background:var(--green);color:#fff}.btn-danger{background:var(--red);color:#fff}.btn-outline{background:#fff;border:1px solid var(--line)}.btn-sm{padding:8px 11px;font-size:.88rem}
label{display:block;font-weight:700;margin-bottom:7px}.field{margin-bottom:16px}.input,select,textarea{width:100%;border:1px solid #cbd7e3;border-radius:12px;background:#fff;padding:12px 13px;font:inherit;color:var(--ink);outline:none}.input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(11,92,171,.12)}textarea{min-height:90px;resize:vertical}.help{color:var(--muted);font-size:.88rem;margin-top:6px}
.login-shell{min-height:calc(100vh - 72px);display:grid;place-items:center;padding:24px}.login-card{width:min(100%,460px);background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 24px 60px rgba(17,50,80,.13);padding:30px}.login-card h1{margin:0 0 8px}.login-card>p{color:var(--muted);margin-top:0}.login-options{display:grid;gap:12px;margin-top:22px}.login-option{display:flex;gap:14px;align-items:center;padding:16px;border:1px solid var(--line);border-radius:15px;text-decoration:none}.login-option:hover{border-color:var(--blue);background:#f5f9ff}
.alert{padding:13px 16px;border-radius:13px;margin-bottom:18px;border:1px solid}.alert-success{background:#eaf8f0;color:#176238;border-color:#bfe7ce}.alert-error{background:#fff0f1;color:#9f2430;border-color:#f2c2c7}.alert-info{background:#edf6ff;color:#13578e;border-color:#c8e1f6}.badge{display:inline-flex;align-items:center;border-radius:999px;padding:5px 9px;font-size:.78rem;font-weight:800}.badge-green{background:#e8f7ef;color:#176238}.badge-red{background:#fff0f1;color:#a32935}.badge-amber{background:#fff6df;color:#8a5b11}.badge-blue{background:#eaf3ff;color:#0b5cab}.badge-gray{background:#eef2f5;color:#5a6977}
.class-card{position:relative}.class-card .class-name{font-size:1.1rem;font-weight:800}.class-card .teacher{color:var(--muted);font-size:.87rem;min-height:42px}.class-card .class-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:15px}.class-card .class-stats div{background:#f6f9fc;padding:10px;border-radius:12px;text-align:center}.class-card .class-stats strong{display:block;font-size:1.2rem}.progress{height:9px;background:#e9eef4;border-radius:999px;overflow:hidden;margin-top:14px}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--teal));border-radius:999px}
.hero-dashboard{background:linear-gradient(135deg,#0b5cab,#0f8b8d);color:#fff;border-radius:26px;padding:26px;box-shadow:0 20px 45px rgba(11,92,171,.2);margin-bottom:22px}.hero-dashboard h1{margin:0;font-size:clamp(1.8rem,4vw,3rem)}.hero-dashboard p{margin:6px 0 0;color:#e2f2ff}.hero-meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.hero-meta span{background:#ffffff1c;border:1px solid #ffffff35;padding:8px 12px;border-radius:999px}
.scan-shell{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.6fr);gap:20px}.camera-box{background:#071b2d;border-radius:22px;overflow:hidden;min-height:430px;position:relative}.camera-box video{width:100%;height:100%;min-height:430px;object-fit:cover}.scan-guide{position:absolute;inset:16%;border:3px solid #fff;border-radius:24px;box-shadow:0 0 0 9999px rgba(0,0,0,.26)}.scan-status{padding:18px;border-radius:16px;background:#f4f7fb;text-align:center}.scan-status.success{background:#e9f8ef;color:#176238}.scan-status.error{background:#fff0f1;color:#9f2430}
.reason-form{display:grid;grid-template-columns:1.2fr 1.2fr auto;gap:10px;align-items:end}.reason-form .field{margin:0}
.muted{color:var(--muted)}.text-right{text-align:right}.text-center{text-align:center}.mt-0{margin-top:0}.mt-2{margin-top:16px}.mb-0{margin-bottom:0}.nowrap{white-space:nowrap}
.empty{padding:35px;text-align:center;color:var(--muted)}.status-line{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.dot{width:10px;height:10px;border-radius:50%;background:#9aa9b8}.dot.open{background:#22a060;box-shadow:0 0 0 5px #22a06020}.dot.closed{background:#d44752}
.duty-row{display:grid;grid-template-columns:1.4fr 1fr auto;gap:10px;align-items:end;margin-bottom:10px}.duty-row .field{margin:0}
.qr-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.qr-card{border:1px dashed #8597a8;border-radius:12px;padding:12px;text-align:center;break-inside:avoid;background:#fff}.qr-card img{width:145px;height:145px}.qr-card strong{display:block;margin-top:5px}.qr-card small{display:block;color:#526778}
.install-wrap{max-width:860px;margin:40px auto;padding:20px}.install-steps{display:flex;gap:8px;margin-bottom:20px}.install-steps span{flex:1;padding:10px;border-radius:10px;background:#e9eef4;text-align:center;font-size:.85rem;font-weight:700}.install-steps span.active{background:var(--blue);color:#fff}
@media(max-width:1000px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.scan-shell{grid-template-columns:1fr}.side-nav{width:190px}.app-main{margin-left:190px}.qr-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.topbar{height:64px;padding:0 14px}.brand small{display:none}.user-chip span{max-width:130px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.side-nav{position:fixed;z-index:50;top:auto;left:0;right:0;bottom:0;width:auto;height:68px;padding:7px 8px;display:flex;overflow-x:auto;border-right:0;border-top:1px solid var(--line);gap:3px}.side-nav a{flex:1;min-width:76px;text-align:center;padding:8px 7px;font-size:.75rem;margin:0}.app-main{margin-left:0;padding:18px 14px 90px}.public-main{padding:18px 14px}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.page-head{display:block}.page-actions{margin-top:15px}.reason-form{grid-template-columns:1fr}.duty-row{grid-template-columns:1fr}.camera-box,.camera-box video{min-height:330px}.qr-grid{grid-template-columns:1fr}.login-card{padding:24px}.hero-dashboard{padding:22px}.stat-table th,.stat-table td{padding:11px 9px}}
@media print{.topbar,.side-nav,.page-actions,.no-print{display:none!important}.app-main,.public-main{margin:0;padding:0}.card{box-shadow:none;border:0}.qr-grid{grid-template-columns:repeat(3,1fr)}body{background:#fff}}