:root{
  --bg:#f4f7fb;--panel:#fff;--panel2:#f8fafc;--text:#172033;--muted:#6b778c;
  --border:#dfe6ef;--navy:#0b1220;--navy2:#17243a;--blue:#2563eb;--blue2:#1d4ed8;
  --blue-soft:#eaf1ff;--green:#109b67;--green-soft:#e9fbf3;--amber:#c97707;--amber-soft:#fff5df;
  --red:#d84747;--red-soft:#fff0f0;--shadow:0 8px 28px rgba(15,23,42,.06);
  --radius:16px;--sidebar:236px;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{min-height:100vh}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.5}
a{color:inherit}
.hidden{display:none!important}
.shell{min-height:100vh;display:flex}
.sidebar{position:fixed;left:0;top:0;bottom:0;width:var(--sidebar);background:linear-gradient(180deg,var(--navy),#111b31);color:#fff;padding:20px 14px;display:flex;flex-direction:column;z-index:40}
.brand{display:flex;align-items:center;gap:11px;padding:4px 10px 24px}
.brand-mark{width:42px;height:42px;border-radius:13px;background:#fff;color:var(--navy);display:grid;place-items:center;font-weight:900;letter-spacing:-1px}
.brand-text strong{display:block;font-size:18px}
.brand-text span{display:block;color:#9fb0c8;font-size:11px;margin-top:2px}
.nav{display:flex;flex-direction:column;gap:6px}
.nav-btn{border:0;background:transparent;color:#cbd5e1;text-align:left;border-radius:11px;padding:12px 13px;display:flex;gap:11px;align-items:center;font-weight:600}
.nav-btn:hover,.nav-btn.active{background:#26354d;color:#fff}
.nav-icon{width:20px;text-align:center}
.sidebar-spacer{flex:1}
.sidebar-card{border-top:1px solid rgba(255,255,255,.1);padding:16px 9px 4px}
.sidebar-card .user{font-weight:700;font-size:13px}
.sidebar-card small{display:block;color:#8798b2;margin-top:4px;line-height:1.4}
.main{margin-left:var(--sidebar);width:calc(100% - var(--sidebar));min-width:0}
.topbar{position:sticky;top:0;z-index:30;min-height:78px;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);padding:14px 26px;display:flex;align-items:center;gap:15px}
.topbar h1{font-size:21px;margin:0 0 3px;line-height:1.2}
.topbar p{font-size:12.5px;color:var(--muted);margin:0}
.topbar-actions{margin-left:auto;display:flex;gap:8px;align-items:center}
.content{padding:22px 26px 40px;max-width:1480px;margin:0 auto}
.primary,.secondary,.success,.danger,.ghost{border-radius:10px;padding:9px 13px;font-weight:700;border:1px solid transparent;min-height:40px}
.primary{background:var(--blue);color:#fff}
.primary:hover{background:var(--blue2)}
.secondary{background:#fff;color:var(--text);border-color:var(--border)}
.secondary:hover{background:#f7f9fc}
.success{background:var(--green);color:#fff}
.danger{background:#fff;color:var(--red);border-color:#efbcbc}
.ghost{background:transparent;color:var(--muted)}
.icon-btn{border:1px solid var(--border);background:#fff;width:40px;height:40px;border-radius:10px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-pad{padding:18px}
.grid{display:grid;gap:15px}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.stat{padding:17px}
.stat-label{font-size:12.5px;color:var(--muted);margin-bottom:8px}
.stat-value{font-size:28px;font-weight:850;letter-spacing:-.5px}
.stat-note{font-size:11.5px;color:var(--muted);margin-top:6px}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:13px;margin:23px 0 11px}
.section-head h2{font-size:17px;margin:0}
.section-head p{font-size:12px;color:var(--muted);margin:4px 0 0}
.actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.search{display:flex;gap:9px;align-items:center;margin-bottom:15px}
.search input{flex:1}
input,select,textarea{border:1px solid var(--border);border-radius:10px;padding:10px 11px;background:#fff;color:var(--text);outline:none}
input:focus,select:focus,textarea:focus{border-color:#8bb0ff;box-shadow:0 0 0 3px rgba(37,99,235,.10)}
.student-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}
.student-card{padding:17px;display:flex;flex-direction:column;gap:13px}
.student-head{display:flex;align-items:center;gap:11px}
.avatar{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-weight:850;flex:none}
.avatar.big{width:72px;height:72px;font-size:22px}
.student-head h3{margin:0 0 3px;font-size:16px}
.student-head p{margin:0;color:var(--muted);font-size:11.5px}
.pills{display:flex;gap:6px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:4px;padding:5px 8px;border-radius:999px;background:#f1f4f8;color:#536177;font-size:11px}
.pill.green{background:var(--green-soft);color:#08794b}
.pill.amber{background:var(--amber-soft);color:#925300}
.pill.red{background:var(--red-soft);color:#af3030}
.profile{overflow:hidden}
.profile-head{padding:19px;display:flex;align-items:center;gap:16px}
.profile-title{flex:1;min-width:0}
.profile-title h2{font-size:27px;margin:0 0 6px;letter-spacing:-.4px}
.profile-meta{display:flex;gap:11px;flex-wrap:wrap;color:var(--muted);font-size:12px}
.tabs{display:flex;gap:2px;overflow:auto;padding:0 18px;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.tab{border:0;background:transparent;color:var(--muted);font-weight:700;padding:13px 11px;border-bottom:2px solid transparent;white-space:nowrap}
.tab.active{color:var(--blue);border-color:var(--blue)}
.profile-body{padding:18px}
.info-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.info{border:1px solid var(--border);border-radius:12px;padding:13px}
.info span{display:block;color:var(--muted);font-size:11px;margin-bottom:5px}
.info strong{font-size:14px}
.notice{border-radius:12px;padding:12px 14px;background:var(--blue-soft);color:#174fb5;font-size:12px;line-height:1.45}
.notice.green{background:var(--green-soft);color:#08794b}
.notice.amber{background:var(--amber-soft);color:#925300}
.notice.red{background:var(--red-soft);color:#af3030}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;font-size:12.5px}
th,td{padding:10px 11px;border-bottom:1px solid var(--border);text-align:left;white-space:nowrap}
th{background:#f7f9fc;color:#556277;font-weight:750;position:sticky;top:0}
tbody tr:hover{background:#fafcff}
tbody tr:last-child td{border-bottom:0}
.matrix th:first-child,.matrix td:first-child{position:sticky;left:0;z-index:3}
.matrix th:first-child{background:#f7f9fc}
.matrix td:first-child{background:#fff}
.badge{display:inline-block;padding:4px 7px;border-radius:7px;background:#eef2f7;color:#5b677a;font-size:10.5px;font-weight:750}
.badge.blue{background:var(--blue-soft);color:#174fb5}
.badge.green{background:var(--green-soft);color:#08794b}
.score-empty{font-size:11px;color:var(--muted);font-style:italic}
.split{display:grid;grid-template-columns:1.55fr .8fr;gap:15px}
.list{display:flex;flex-direction:column}
.list-row{display:flex;justify-content:space-between;gap:13px;align-items:center;padding:11px 0;border-bottom:1px solid var(--border)}
.list-row:last-child{border-bottom:0}
.list-row strong{font-size:13px}
.empty{padding:30px 16px;text-align:center;color:var(--muted);font-size:12px}
.calendar{display:grid;grid-template-columns:repeat(7,minmax(120px,1fr));gap:8px;overflow:auto}
.day{min-height:350px;padding:10px;background:#fff;border:1px solid var(--border);border-radius:12px}
.day h4{margin:0 0 10px;font-size:12px}
.event{background:var(--blue-soft);border-left:3px solid var(--blue);border-radius:9px;padding:8px;margin-bottom:7px;font-size:11px;line-height:1.35}
.event strong{display:block;margin-bottom:3px}
.event.eval{background:var(--green-soft);border-left-color:var(--green)}
.progress-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}
.progress-card{padding:15px}
.progress-card-head{display:flex;justify-content:space-between;gap:8px;align-items:center}
.progress-card h3{font-size:14px;margin:0}
.chart{height:100px;margin:12px 0 5px}
.chart svg{width:100%;height:100%;overflow:visible}
.chart-grid{stroke:#e8edf4;stroke-width:1}
.chart-line{fill:none;stroke:var(--blue);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.chart-dot{fill:#fff;stroke:var(--blue);stroke-width:2}
.metric-line{display:flex;justify-content:space-between;gap:9px;align-items:end}
.metric-line strong{font-size:18px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.field{display:flex;flex-direction:column;gap:5px}
.field.full{grid-column:1/-1}
.field label{font-size:11.5px;color:#566379;font-weight:750}
.field textarea{min-height:84px;resize:vertical}
.form-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:17px}
.modal-backdrop{position:fixed;inset:0;background:rgba(11,18,32,.55);z-index:100;display:grid;place-items:center;padding:16px}
.modal{width:min(760px,100%);max-height:92vh;overflow:auto;background:#fff;border-radius:18px;box-shadow:0 25px 80px rgba(0,0,0,.23);padding:20px}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:15px}
.modal h2{font-size:19px;margin:0}
.toast{position:fixed;right:21px;bottom:21px;background:#111827;color:#fff;border-radius:10px;padding:11px 14px;box-shadow:var(--shadow);z-index:140;font-size:12px}
.auth-page{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;background:#fff}
.auth-brand{background:linear-gradient(150deg,#0b1220,#13233d);color:#fff;padding:8vw;display:flex;flex-direction:column;justify-content:center}
.auth-brand .brand-mark{width:56px;height:56px;margin-bottom:20px}
.auth-brand h1{font-size:46px;letter-spacing:-1.6px;margin:0 0 12px}
.auth-brand p{max-width:500px;color:#bcc9da;line-height:1.55;font-size:16px}
.auth-feature{margin-top:25px;display:flex;flex-direction:column;gap:12px;color:#dfe8f5}
.auth-feature div{display:flex;gap:9px;align-items:center}
.auth-panel{display:grid;place-items:center;padding:30px}
.auth-box{width:min(430px,100%)}
.auth-box h2{font-size:26px;margin:0 0 7px}
.auth-box>p{color:var(--muted);font-size:13px;margin:0 0 22px;line-height:1.5}
.auth-box .field{margin-bottom:11px}
.auth-box button{width:100%;margin-top:5px}
.auth-divider{text-align:center;color:var(--muted);font-size:11px;margin:14px 0}
.demo-banner{position:sticky;top:78px;z-index:25;background:#fff6db;color:#7b4d00;border-bottom:1px solid #efd99f;padding:8px 26px;font-size:11.5px;display:flex;justify-content:space-between;gap:12px;align-items:center}
.mobile-only,.mobile-nav{display:none}
.setup-box{border:1px dashed #a8bbd8;background:#f8fbff;border-radius:12px;padding:14px;font-size:12px;line-height:1.5;margin-top:15px}
@media(max-width:1080px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .student-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns:1fr}
  .progress-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
  :root{--sidebar:0px}
  .sidebar{display:none}
  .main{margin-left:0;width:100%;padding-bottom:71px}
  .topbar{min-height:67px;padding:10px 13px}
  .topbar h1{font-size:18px}
  .topbar p{display:none}
  .topbar-actions .desktop-only{display:none}
  .content{padding:13px}
  .grid-4,.grid-3,.grid-2,.student-grid,.info-grid,.progress-grid{grid-template-columns:1fr}
  .profile-head{align-items:flex-start;flex-wrap:wrap}
  .profile-title{min-width:calc(100% - 90px)}
  .profile-title h2{font-size:23px}
  .profile-head>.actions{width:100%}
  .profile-head>.actions button{flex:1}
  .form-grid{grid-template-columns:1fr}
  .field.full{grid-column:auto}
  .mobile-only{display:block}
  .mobile-nav{display:grid;position:fixed;bottom:0;left:0;right:0;height:68px;padding-bottom:env(safe-area-inset-bottom);background:rgba(255,255,255,.96);backdrop-filter:blur(15px);border-top:1px solid var(--border);z-index:50;grid-template-columns:repeat(5,1fr)}
  .mobile-nav button{border:0;background:transparent;color:var(--muted);font-size:10px;font-weight:700;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:3px}
  .mobile-nav button.active{color:var(--blue)}
  .mobile-nav span:first-child{font-size:18px}
  .demo-banner{top:67px;padding:7px 13px}
  .auth-page{grid-template-columns:1fr}
  .auth-brand{display:none}
  .auth-panel{padding:22px}
  .modal{padding:16px}
}