:root{
  --bg:#f4f7fb;--panel:#fff;--panel2:#f8fafc;--text:#172033;--muted:#7b879e;
  --line:#e5ebf3;--brand:#3f76ff;--brand2:#6d93ff;--ok:#16a085;--danger:#d64545;
  --shadow:0 12px 32px rgba(25,42,70,.08);--radius:22px;
}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);
  font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{min-height:100vh}.boot{display:grid;place-items:center;min-height:100vh;font-size:30px;font-weight:800;letter-spacing:.02em}
button,input,select,textarea{font:inherit}.hidden{display:none!important}
.login-shell{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(360px,.9fr);background:
  radial-gradient(circle at 15% 25%,rgba(82,126,255,.13),transparent 30%),
  linear-gradient(135deg,#f9fbff,#eef3fb)}
.login-hero{padding:clamp(48px,7vw,100px);display:flex;flex-direction:column;justify-content:center}
.brand-mark{width:64px;height:64px;border-radius:20px;display:grid;place-items:center;background:linear-gradient(145deg,var(--brand),#7b9dff);
 color:#fff;font-size:30px;font-weight:900;box-shadow:0 16px 30px rgba(63,118,255,.28)}
.login-hero h1{font-size:clamp(42px,6vw,76px);line-height:1;margin:28px 0 14px;letter-spacing:-.05em}
.login-hero p{font-size:18px;line-height:1.8;color:var(--muted);max-width:620px}
.login-panel{display:grid;place-items:center;padding:32px}.login-card{width:min(420px,100%);background:rgba(255,255,255,.88);backdrop-filter:blur(16px);
 border:1px solid rgba(255,255,255,.75);box-shadow:var(--shadow);border-radius:28px;padding:34px}
.login-card h2{margin:0 0 8px;font-size:26px}.subtle{color:var(--muted);font-size:14px}
.field{display:flex;flex-direction:column;gap:8px;margin-top:18px}.field label{font-size:13px;font-weight:700;color:#5d6980}
input,select,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;color:var(--text);outline:none;transition:.18s}
input:focus,select:focus,textarea:focus{border-color:#9bb4ff;box-shadow:0 0 0 4px rgba(63,118,255,.10)}
textarea{min-height:96px;resize:vertical}
.btn{border:0;border-radius:14px;padding:11px 16px;cursor:pointer;transition:.16s;font-weight:700}
.btn:hover{transform:translateY(-1px)}.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 8px 18px rgba(63,118,255,.22)}
.btn-ghost{background:var(--panel2);color:#465267}.btn-danger{background:#fff1f1;color:var(--danger)}.btn-block{width:100%;margin-top:20px}
.shell{min-height:100vh;display:grid;grid-template-columns:240px 1fr}.sidebar{padding:24px 18px;border-right:1px solid var(--line);background:rgba(255,255,255,.86);backdrop-filter:blur(18px);position:sticky;top:0;height:100vh}
.sidebar-head{display:flex;align-items:center;gap:12px;padding:6px 8px 24px}.sidebar-head .brand-mark{width:42px;height:42px;border-radius:13px;font-size:20px}.sidebar-head strong{font-size:18px}
.nav{display:flex;flex-direction:column;gap:6px}.nav button{border:0;background:transparent;text-align:left;padding:11px 13px;border-radius:13px;color:#536077;cursor:pointer;font-weight:700}
.nav button.active{background:#edf3ff;color:var(--brand)}.nav button:hover{background:#f4f6fa}
.side-foot{position:absolute;left:18px;right:18px;bottom:20px}.userbox{display:flex;justify-content:space-between;align-items:center;padding:12px;border:1px solid var(--line);border-radius:14px;background:#fff}
.main{padding:28px 34px 50px;min-width:0}.topbar{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:26px}
.topbar h1{margin:0;font-size:30px;letter-spacing:-.03em}.topbar-right{display:flex;align-items:center;gap:10px}
.student-select{min-width:190px}.grid{display:grid;gap:18px}.grid.metrics{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(24,39,75,.045);padding:22px;min-width:0}
.metric .label{color:var(--muted);font-size:13px}.metric .value{font-size:32px;font-weight:800;margin-top:8px;letter-spacing:-.04em}.metric .hint{font-size:12px;color:var(--muted);margin-top:5px}
.section-grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,.85fr);gap:18px;margin-top:18px}.card-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}.card-title h3{margin:0;font-size:18px}
.chart-controls{display:flex;gap:8px;flex-wrap:wrap}.chart-controls select{width:auto;padding:8px 10px;border-radius:10px;font-size:13px}
.chart-wrap{position:relative;min-height:330px}.svgchart{width:100%;height:330px;display:block}.axis{stroke:#dce3ed;stroke-width:1}.gridline{stroke:#edf1f6;stroke-width:1}.series{fill:none;stroke:var(--brand);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.dot{fill:#fff;stroke:var(--brand);stroke-width:3;cursor:pointer}.dot:hover{r:6}
.chart-label{font-size:11px;fill:#8894a8}.tooltip{position:absolute;pointer-events:none;background:#172033;color:#fff;padding:10px 12px;border-radius:12px;font-size:12px;line-height:1.55;box-shadow:0 10px 28px rgba(0,0,0,.18);transform:translate(-50%,-110%);min-width:150px;z-index:10}
.radar-ring{fill:none;stroke:#e6ebf2}.radar-axis{stroke:#e6ebf2}.radar-latest{fill:rgba(63,118,255,.18);stroke:var(--brand);stroke-width:2}.radar-avg{fill:rgba(22,160,133,.10);stroke:var(--ok);stroke-width:2;stroke-dasharray:6 4}.legend{display:flex;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:12px}.legend i{display:inline-block;width:18px;height:3px;border-radius:3px;margin-right:6px;vertical-align:middle}
.table-card{margin-top:18px;overflow:hidden}.table-toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:14px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:16px}
table{border-collapse:collapse;width:100%;min-width:1000px;background:#fff}th,td{padding:12px 13px;border-bottom:1px solid var(--line);font-size:13px;text-align:left;white-space:nowrap}th{position:sticky;top:0;background:#f8fafc;color:#67748a;font-size:12px;z-index:1}tr:last-child td{border-bottom:0}.pill{display:inline-flex;align-items:center;padding:4px 8px;border-radius:999px;background:#eef3ff;color:#4b72d6;font-size:11px;font-weight:800}
.score-assigned{font-weight:800;color:#2e5ed7}.score-arrow{color:#a2acba;margin:0 4px}.muted{color:var(--muted)}
.empty{padding:44px 20px;text-align:center;color:var(--muted)}.actions{display:flex;gap:6px}.icon-btn{border:0;background:#f5f7fb;padding:7px 9px;border-radius:9px;cursor:pointer;color:#59667a}
.modal-backdrop{position:fixed;inset:0;background:rgba(18,28,45,.36);backdrop-filter:blur(4px);display:grid;place-items:center;padding:20px;z-index:50}
.modal{width:min(860px,100%);max-height:min(90vh,900px);overflow:auto;background:#fff;border-radius:26px;padding:24px;box-shadow:0 28px 70px rgba(20,35,60,.24)}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.modal-head h2{margin:0}.close{border:0;background:#f3f5f8;border-radius:10px;padding:8px 11px;cursor:pointer}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.span-2{grid-column:1/-1}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.subject-box{border:1px solid var(--line);border-radius:16px;padding:13px;background:#fbfcfe}.subject-box h4{margin:0 0 8px;font-size:14px}.mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mini-grid.one{grid-template-columns:1fr}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.toast{position:fixed;right:22px;bottom:22px;background:#172033;color:#fff;padding:12px 16px;border-radius:13px;box-shadow:var(--shadow);z-index:90}
.import-modal{width:min(980px,100%)}.import-intro{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}.import-textarea{min-height:180px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.65}.import-tools{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;align-items:center}.import-tools .btn-primary{margin-left:auto}
.import-preview{margin-top:18px;display:flex;flex-direction:column;gap:14px}.import-result-head{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px;padding:2px 2px 0}.import-card{border:1px solid var(--line);border-radius:18px;padding:18px;background:#fcfdff}
.import-card-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px}.format-badge{display:inline-flex;padding:5px 9px;border-radius:999px;background:#edf3ff;color:var(--brand);font-size:11px;font-weight:800;white-space:nowrap}
.notice{border-radius:12px;padding:10px 12px;font-size:12px;line-height:1.65;margin:10px 0}.notice-warn{background:#fff8e7;color:#805c12;border:1px solid #f4dfaa}.notice-error{background:#fff1f1;color:var(--danger);border:1px solid #f0c7c7}
.import-section-label{margin:8px 0 6px;font-weight:700}.import-savebar{position:sticky;bottom:-24px;background:linear-gradient(transparent,#fff 30%);padding-top:28px;padding-bottom:2px}
.import-card input[type="number"]{font-variant-numeric:tabular-nums}.import-card .field{margin-top:0}

.mobile-nav{display:none}
@media(max-width:1050px){.grid.metrics{grid-template-columns:repeat(2,1fr)}.section-grid{grid-template-columns:1fr}.subject-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){
 .login-shell{grid-template-columns:1fr}.login-hero{display:none}.login-panel{min-height:100vh;padding:20px}
 .shell{display:block}.sidebar{display:none}.main{padding:20px 14px 86px}.topbar{align-items:flex-start;flex-direction:column}.topbar-right{width:100%}.student-select{flex:1;min-width:0}
 .grid.metrics{grid-template-columns:repeat(2,1fr);gap:10px}.card{padding:16px;border-radius:18px}.metric .value{font-size:25px}
 .section-grid{gap:10px}.table-card{margin-top:10px}.subject-grid,.form-grid{grid-template-columns:1fr}.span-2{grid-column:auto}.modal{padding:18px;border-radius:22px}.mobile-nav{position:fixed;display:flex;left:10px;right:10px;bottom:10px;background:rgba(255,255,255,.92);backdrop-filter:blur(18px);border:1px solid var(--line);border-radius:18px;padding:7px;z-index:30;box-shadow:var(--shadow)}
 .mobile-nav button{flex:1;border:0;background:transparent;border-radius:12px;padding:10px 6px;font-size:12px;color:#748096;font-weight:700}.mobile-nav button.active{background:#edf3ff;color:var(--brand)}
}