:root{--accent:#2563eb;--accent-dark:#1d4ed8;--bg:#f5f6f8;--card:#fff;--text:#1f2937;--muted:#6b7280;--border:#e5e7eb;--green:#16a34a;--orange:#ea580c;--red:#dc2626;--blue:#2563eb;--gray:#6b7280}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.6}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{min-height:100vh;display:flex}.nav{color:#e5e7eb;background:#111827;flex-shrink:0;width:200px;height:100vh;padding:20px 12px;position:sticky;top:0}.nav h1{color:#fff;margin:0 0 6px;padding:0 10px;font-size:16px}.nav .sub{color:#9ca3af;margin-bottom:18px;padding:0 10px;font-size:12px}.nav a.navlink{color:#d1d5db;border-radius:8px;margin-bottom:2px;padding:9px 12px;font-size:14px;display:block}.nav a.navlink:hover{color:#fff;background:#1f2937;text-decoration:none}.nav a.navlink.active{background:var(--accent);color:#fff}.nav .logout{border-top:1px solid #374151;margin-top:20px;padding-top:14px}.nav .logout button{color:#d1d5db;cursor:pointer;background:0 0;border:1px solid #4b5563;border-radius:8px;width:100%;padding:8px;font-size:13px}.nav .logout button:hover{color:#ef4444;border-color:#ef4444}.main{flex:1;max-width:1100px;padding:24px 28px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:16px;padding:18px 20px}.card h2{margin:0 0 14px;font-size:16px}.card h3{margin:0 0 10px;font-size:14px}.row{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.muted{color:var(--muted);font-size:13px}.btn{border:1px solid var(--border);color:var(--text);cursor:pointer;background:#fff;border-radius:8px;align-items:center;gap:6px;padding:8px 14px;font-size:14px;transition:all .15s;display:inline-flex}.btn:hover{border-color:var(--accent);color:var(--accent)}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-dark)}.btn.green{background:var(--green);border-color:var(--green);color:#fff}.btn.green:hover{opacity:.9}.btn.orange{background:var(--orange);border-color:var(--orange);color:#fff}.btn.small{padding:4px 10px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed}input[type=text],input[type=number],input[type=date],textarea,select{border:1px solid var(--border);color:var(--text);background:#fff;border-radius:8px;padding:8px 10px;font-family:inherit;font-size:14px}input:focus,textarea:focus,select:focus{border-color:var(--accent);outline:none}textarea{width:100%}.badge{white-space:nowrap;border-radius:999px;padding:2px 10px;font-size:12px;display:inline-block}table.data{border-collapse:collapse;width:100%;font-size:13px}table.data th,table.data td{border-bottom:1px solid var(--border);text-align:left;padding:8px 10px}table.data th{color:var(--muted);background:#fafafa;font-weight:500}table.data tr:hover td{background:#fafbfc}.toast{color:#fff;z-index:999;background:#111827;border-radius:10px;padding:10px 18px;font-size:14px;position:fixed;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 6px 20px #0003}.toast.err{background:#dc2626}.toast.ok{background:#15803d}.summary{flex-wrap:wrap;gap:12px;display:flex}.sum-item{background:var(--card);border:1px solid var(--border);border-radius:12px;flex:1;min-width:120px;padding:14px 16px}.sum-item .num{font-size:24px;font-weight:700}.sum-item .lbl{color:var(--muted);font-size:13px}.sum-item.warn .num{color:var(--orange)}.sum-item.bad .num{color:var(--red)}.sum-item.good .num{color:var(--green)}.kp-wrap{border:1px solid var(--border);border-radius:8px;max-height:320px;overflow:auto}.images{flex-wrap:wrap;gap:16px;display:flex}.images img{border:1px solid var(--border);background:#fff;border-radius:8px;max-width:460px}.workbench{align-items:flex-start;gap:16px;display:flex}.sidebar{background:var(--card);border:1px solid var(--border);border-radius:12px;flex-direction:column;flex-shrink:0;width:220px;max-height:calc(100vh - 48px);display:flex;position:sticky;top:24px;overflow:hidden}.sidebar-summary{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:8px;padding:12px 14px;display:flex}.ss-item{color:var(--muted);white-space:nowrap;font-size:12px}.ss-item.bad{color:var(--red)}.ss-item.warn{color:var(--orange)}.sidebar-list{padding:8px;overflow-y:auto}.stu-item{cursor:pointer;text-align:left;width:100%;color:var(--text);background:0 0;border:none;border-radius:8px;justify-content:space-between;align-items:center;padding:9px 10px;font-size:14px;display:flex}.stu-item:hover{background:#f3f4f6}.stu-item.active{background:#dbeafe}.stu-item .stu-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.content{flex:1;min-width:0}.badge.gray{color:#4b5563;background:#f3f4f6}.badge.blue{color:#1d4ed8;background:#dbeafe}.badge.green{color:#15803d;background:#dcfce7}.badge.orange{color:#c2410c;background:#ffedd5}.badge.red{color:#b91c1c;background:#fee2e2}