:root{color-scheme:light;--page: #f5f5f2;--surface: #ffffff;--surface-2: #f1f0ed;--text: #111111;--text-2: #55544f;--muted: #8a8882;--border: #e4e3de;--accent: #2a78d6;--accent-hover: #1c5cab;--accent-soft: #e8f1fc;--good: #0a7a0a;--good-soft: #e4f4e4;--bad: #b42e2e;--bad-soft: #fbe7e7;--warn: #8a5a00;--warn-soft: #fdf2d8;--radius: 12px;--font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--page: #0f0f0f;--surface: #1a1a19;--surface-2: #242422;--text: #f0efec;--text-2: #c3c2b7;--muted: #8f8d86;--border: #2e2e2b;--accent: #3987e5;--accent-hover: #6da7ec;--accent-soft: #172a42;--good: #3cbf3c;--good-soft: #15291a;--bad: #e66767;--bad-soft: #351818;--warn: #fab219;--warn-soft: #2f2610}}:root[data-theme=dark]{color-scheme:dark;--page: #0f0f0f;--surface: #1a1a19;--surface-2: #242422;--text: #f0efec;--text-2: #c3c2b7;--muted: #8f8d86;--border: #2e2e2b;--accent: #3987e5;--accent-hover: #6da7ec;--accent-soft: #172a42;--good: #3cbf3c;--good-soft: #15291a;--bad: #e66767;--bad-soft: #351818;--warn: #fab219;--warn-soft: #2f2610}*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--text);font-family:var(--font);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}h1,h2{margin:0;font-weight:650;letter-spacing:-.015em}h1{font-size:26px}h2{font-size:17px}.topbar{background:var(--surface);border-bottom:1px solid var(--border)}.topbar-inner,.container{max-width:920px;margin:0 auto;padding:0 20px}.topbar-inner{height:60px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:650}.brand-mark{width:32px;height:32px;border-radius:9px;background:var(--accent);color:#fff;display:grid;place-items:center}.brand small{display:block;font-weight:400;color:var(--muted);font-size:12px;line-height:1.2}.container{padding-top:32px;padding-bottom:60px;display:flex;flex-direction:column;gap:20px}.page-title p{margin:4px 0 0;color:var(--text-2)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}.card-pad{padding:20px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:40px;padding:0 16px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit;font-weight:550;cursor:pointer;white-space:nowrap}.btn:hover{background:var(--surface-2)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.btn-quiet{border-color:transparent;background:transparent;color:var(--text-2)}.btn-danger{color:var(--bad)}.btn-icon{width:36px;height:36px;padding:0}.input,.select{height:40px;padding:0 12px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit;width:100%;min-width:0}.input:focus,.select:focus,.btn:focus-visible,.row-link:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:550;color:var(--text-2)}.hint{font-size:13px;color:var(--muted)}.error{font-size:13px;color:var(--bad)}.student-form{display:grid;grid-template-columns:1.3fr 1.3fr 1.2fr 100px auto;gap:12px;align-items:end}.student-form .hint,.student-form .error{grid-column:1 / -1;margin-top:-4px}.list-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--border)}.search{position:relative;width:240px}.search svg{position:absolute;left:11px;top:12px;color:var(--muted)}.search .input{padding-left:34px}.row-link{display:grid;grid-template-columns:1fr 90px 120px 150px 36px;align-items:center;gap:12px;padding:14px 20px;border-bottom:1px solid var(--border);color:var(--text);cursor:pointer}.row-link:last-child{border-bottom:none}.row-link:hover{background:var(--surface-2)}.row-name{font-weight:550}.col-head{display:grid;grid-template-columns:1fr 90px 120px 150px 36px;gap:12px;padding:10px 20px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--border)}.muted{color:var(--muted)}.code{font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:13px;background:var(--surface-2);padding:2px 7px;border-radius:6px}.empty{padding:40px 20px;text-align:center;color:var(--text-2)}.empty strong{display:block;color:var(--text);font-size:16px;margin-bottom:4px}.notice{padding:12px 16px;border-radius:var(--radius);background:var(--warn-soft);color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.back{display:inline-flex;align-items:center;gap:4px;color:var(--text-2);font-weight:500}.back:hover{color:var(--text)}.student-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}.student-head p{margin:6px 0 0;color:var(--text-2)}.actions{display:flex;gap:8px}.session{overflow:hidden}.session-main{width:100%;display:grid;grid-template-columns:1fr repeat(4,96px) 24px;align-items:center;gap:12px;padding:16px 20px;background:none;border:none;font:inherit;color:inherit;text-align:left;cursor:pointer}.session-main:hover{background:var(--surface-2)}.session-title{font-weight:600}.session-sub{font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:2px}.metric{text-align:center}.metric-value{font-size:19px;font-weight:650;font-variant-numeric:tabular-nums;line-height:1.2}.metric-label{font-size:12px;color:var(--muted)}.metric.bad .metric-value{color:var(--bad)}.metric.good .metric-value{color:var(--good)}.chev{color:var(--muted);transition:transform .15s}.session[data-open=true] .chev{transform:rotate(180deg)}.session-detail{border-top:1px solid var(--border);padding:16px 20px 20px;display:grid;grid-template-columns:1.4fr 1fr;gap:28px}.session-actions{grid-column:1 / -1;display:flex;justify-content:flex-end}.session-detail h3{margin:0 0 8px;font-size:13px;color:var(--text-2);font-weight:600}.mini-table{width:100%;border-collapse:collapse;font-size:14px}.mini-table td{padding:6px 0;border-bottom:1px solid var(--border)}.mini-table tr:last-child td{border-bottom:none}.mini-table td:last-child{text-align:right;color:var(--muted)}.badge{display:inline-flex;align-items:center;height:22px;padding:0 9px;border-radius:999px;font-size:12px;font-weight:550}.badge-good{background:var(--good-soft);color:var(--good)}.badge-bad{background:var(--bad-soft);color:var(--bad)}.badge-warn{background:var(--warn-soft);color:var(--warn)}.badge-neutral{background:var(--surface-2);color:var(--text-2)}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:grid;place-items:center;padding:16px;z-index:50}.modal{width:min(480px,100%);background:var(--surface);border-radius:14px;padding:22px;box-shadow:0 20px 50px #00000040}.modal-body{margin-top:14px}.modal-foot{margin-top:18px;display:flex;justify-content:flex-end;gap:8px}.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:30px 16px;text-align:center;color:var(--text-2);cursor:pointer}.dropzone.over{border-color:var(--accent);background:var(--accent-soft)}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:16px}.login-card{width:min(380px,100%);padding:28px;display:flex;flex-direction:column;gap:16px}.login-card h1{font-size:22px}.login-card p{margin:4px 0 0;color:var(--text-2)}.login-card .btn{width:100%;margin-top:4px}.notice{font-size:13px;padding:10px 12px;border-radius:9px;background:var(--warn-soft);color:var(--warn)}.banner{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 8px 8px 14px;border-radius:9px;background:var(--bad-soft);color:var(--bad);font-size:14px}.banner .btn{color:var(--bad);flex-shrink:0}.topbar-actions{display:flex;align-items:center;gap:8px}.topbar-user{font-size:13px;color:var(--muted);padding-left:4px}@media(max-width:720px){.container{padding-top:22px}.topbar-user{display:none}.student-form{grid-template-columns:1fr 1fr}.student-form .btn{grid-column:1 / -1}.col-head{display:none}.row-link{grid-template-columns:1fr auto 36px}.row-link .hide-sm{display:none}.search{width:100%}.list-head{flex-wrap:wrap}.session-main{grid-template-columns:repeat(4,1fr) 20px}.session-main>:first-child{grid-column:1 / -1}.session-detail{grid-template-columns:1fr;gap:18px}.topbar-inner .btn span{display:none}}