:root{--nhe-red:#c1121f;--nhe-red2:#e31b23;--nhe-ink:#111418;--nhe-muted:#6d737a;--nhe-line:#e5e7ea;--nhe-bg:#f5f6f8;--nhe-white:#fff;--nhe-shadow:0 14px 40px rgba(17,20,24,.08)}
.nhe-app,.nhe-login-page{font-family:Arial,Helvetica,sans-serif;color:var(--nhe-ink);box-sizing:border-box}.nhe-app *,.nhe-login-page *{box-sizing:border-box}
.nhe-topbar{height:82px;background:#fff;border-bottom:1px solid var(--nhe-line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:relative;z-index:2}.nhe-brand-link{display:flex;align-items:center;gap:12px;text-decoration:none;color:#111}.nhe-brand-link b,.nhe-login-brand b{font-size:22px;letter-spacing:1.5px;display:block}.nhe-brand-link small,.nhe-login-brand small{font-size:11px;letter-spacing:4px;color:var(--nhe-red);display:block;margin-top:2px}.nhe-brand-mark{width:42px;height:42px;background:var(--nhe-red);color:#fff;display:grid;place-items:center;font-weight:900;font-size:23px;clip-path:polygon(0 0,100% 0,100% 78%,50% 100%,0 78%)}.nhe-account{display:flex;align-items:center;gap:18px}.nhe-account>div{text-align:right}.nhe-account strong{display:block;font-size:14px}.nhe-account span{display:block;color:var(--nhe-muted);font-size:11px;margin-top:3px}.nhe-link-btn,.nhe-text-btn{border:0;background:none;color:var(--nhe-red);font-weight:700;cursor:pointer;padding:7px 0}.nhe-link-btn:hover,.nhe-text-btn:hover{text-decoration:underline}
.nhe-shell{display:flex;min-height:calc(100vh - 82px);background:var(--nhe-bg)}.nhe-sidebar{width:250px;background:#111418;color:#fff;padding:24px 14px;display:flex;flex-direction:column;flex-shrink:0}.nhe-sidebar-title{font-size:10px;letter-spacing:1.8px;text-transform:uppercase;color:#888e96;padding:0 12px 10px}.nhe-admin-title{margin-top:25px}.nhe-nav{width:100%;display:flex;align-items:center;gap:12px;padding:12px 13px;border:0;background:transparent;color:#cdd1d5;border-radius:8px;font-size:14px;text-align:left;cursor:pointer;margin:2px 0}.nhe-nav span{width:18px;text-align:center;font-size:17px}.nhe-nav:hover{background:#20242a;color:#fff}.nhe-nav.active{background:var(--nhe-red);color:#fff}.nhe-sidebar-bottom{margin-top:auto;border-top:1px solid #2a2f35;padding:16px 12px;color:#9da2a8;font-size:11px}.nhe-sidebar-bottom strong{display:block;color:#fff;margin-bottom:4px}.nhe-sidebar-bottom span{display:block}
.nhe-main{flex:1;min-width:0;padding:34px;overflow:hidden}.nhe-panel{display:none;max-width:1500px;margin:0 auto}.nhe-panel.active{display:block}.nhe-page-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-end;margin-bottom:25px}.nhe-page-head h1{font-size:31px;margin:4px 0 8px;letter-spacing:-.6px}.nhe-page-head p{margin:0;color:var(--nhe-muted);font-size:14px}.nhe-eyebrow{font-size:10px;letter-spacing:1.7px;font-weight:800;color:var(--nhe-red)}
.nhe-btn{border:1px solid #d7dade;background:#fff;border-radius:7px;padding:11px 16px;font-size:13px;font-weight:700;color:#171a1e;cursor:pointer;white-space:nowrap}.nhe-btn:hover{box-shadow:0 4px 14px rgba(0,0,0,.07)}.nhe-btn.nhe-primary{background:var(--nhe-red);border-color:var(--nhe-red);color:#fff}.nhe-btn:disabled{opacity:.45;cursor:not-allowed}.nhe-full{width:100%;padding:13px}.nhe-format{font-size:11px;color:var(--nhe-muted);font-weight:700}
.nhe-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:20px}.nhe-stat,.nhe-card{background:#fff;border:1px solid var(--nhe-line);border-radius:12px;box-shadow:var(--nhe-shadow)}.nhe-stat{padding:20px}.nhe-stat span{font-size:12px;color:var(--nhe-muted);display:block}.nhe-stat strong{font-size:31px;display:block;margin:8px 0 4px}.nhe-stat small{font-size:11px;color:#9a9fa5}.nhe-two-col{display:grid;grid-template-columns:1.5fr 1fr;gap:20px}.nhe-card{padding:22px}.nhe-card-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:18px}.nhe-card-head h2{font-size:18px;margin:4px 0 0}.nhe-recent-list{min-height:180px}.nhe-recent{display:grid;grid-template-columns:1fr auto;gap:12px;padding:13px 0;border-top:1px solid var(--nhe-line)}.nhe-recent:first-child{border-top:0}.nhe-recent strong{font-size:13px}.nhe-recent span{display:block;font-size:11px;color:var(--nhe-muted);margin-top:4px}.nhe-recent b{font-size:11px;color:var(--nhe-red);align-self:center}.nhe-quick-action{width:100%;border:1px solid var(--nhe-line);background:#fff;text-align:left;padding:16px;border-radius:8px;margin:5px 0;cursor:pointer;display:grid;grid-template-columns:1fr auto;gap:3px}.nhe-quick-action:hover{border-color:#c9cdd1}.nhe-quick-action b{font-size:13px}.nhe-quick-action span{font-size:11px;color:var(--nhe-muted)}.nhe-quick-action i{grid-column:2;grid-row:1/3;align-self:center;font-size:20px;color:var(--nhe-red);font-style:normal}
.nhe-workspace{display:grid;grid-template-columns:390px minmax(0,1fr);gap:20px}.nhe-form-card{padding:22px}.nhe-field{margin-bottom:15px}.nhe-field label,.nhe-admin-form label{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.5px;display:block;margin-bottom:7px}.nhe-field label em{color:var(--nhe-red);font-style:normal;font-size:9px;margin-left:5px}.nhe-field input,.nhe-field select,.nhe-admin-form input,.nhe-admin-form select{width:100%;height:42px;border:1px solid #d9dde1;border-radius:7px;padding:0 11px;background:#fff;color:#111;font-size:13px;outline:none}.nhe-field input:focus,.nhe-field select:focus,.nhe-admin-form input:focus,.nhe-admin-form select:focus{border-color:var(--nhe-red);box-shadow:0 0 0 3px rgba(193,18,31,.08)}.nhe-field small{display:block;font-size:10px;color:#8a9097;margin-top:6px;line-height:1.4}.nhe-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.nhe-instructor-box{background:#f8f8f9;border:1px solid var(--nhe-line);border-left:3px solid var(--nhe-red);padding:12px 14px;margin:17px 0}.nhe-instructor-box span{font-size:9px;color:var(--nhe-red);font-weight:800;letter-spacing:1px}.nhe-instructor-box strong{display:block;font-size:14px;margin-top:4px}.nhe-instructor-box small{display:block;color:var(--nhe-muted);font-size:10px;margin-top:3px}.nhe-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.nhe-status{display:none;padding:9px 11px;background:#f0f7f2;border-radius:6px;color:#24663c;font-size:11px;margin-top:12px}.nhe-status.show{display:block}.nhe-status.error{background:#fff0f1;color:#a3121d}.nhe-preview-card{padding:18px;overflow:hidden}.nhe-canvas-wrap{width:100%;background:#eef0f2;border-radius:8px;padding:10px;display:flex;justify-content:center;align-items:center;overflow:hidden}.nhe-canvas-wrap canvas{display:block;width:100%;height:auto;box-shadow:0 8px 25px rgba(0,0,0,.12);background:#fff}.nhe-help{font-size:10px;color:#858b92;line-height:1.45;margin:10px 0 0}.nhe-instructor-pill{background:#fff;border:1px solid var(--nhe-line);padding:10px 14px;border-radius:8px;text-align:right}.nhe-instructor-pill span{font-size:9px;color:var(--nhe-muted);text-transform:uppercase;display:block;letter-spacing:.8px}.nhe-instructor-pill strong{font-size:13px;display:block;margin-top:3px}
.nhe-table-scroll{overflow-x:auto}.nhe-table{width:100%;border-collapse:collapse;font-size:12px}.nhe-table th{font-size:10px;text-transform:uppercase;letter-spacing:.7px;color:#7b8188;text-align:left;border-bottom:1px solid var(--nhe-line);padding:11px 10px}.nhe-table td{padding:13px 10px;border-bottom:1px solid #f0f1f2;vertical-align:middle}.nhe-table tr:last-child td{border-bottom:0}.nhe-mini{border:1px solid #dfe2e5;background:#fff;border-radius:5px;padding:6px 8px;font-size:10px;font-weight:700;color:#222;text-decoration:none;cursor:pointer;margin-right:4px}.nhe-mini.danger{color:#a3121d}.nhe-loading,.nhe-empty{color:#858b92;font-size:12px;padding:25px 5px}.nhe-card-divider{border-top:1px solid var(--nhe-line);margin:24px 0}.nhe-admin-form{max-width:800px}.nhe-admin-form .nhe-grid{margin-bottom:12px}.nhe-admin-form input{margin-bottom:0}.nhe-signature-box{display:flex;align-items:flex-end;gap:18px;flex-wrap:wrap}.nhe-signature-box img{max-width:240px;max-height:90px;object-fit:contain;border:1px dashed #ddd;padding:5px}.nhe-signature-box p{font-size:11px;color:var(--nhe-muted)}
.nhe-login-page{min-height:70vh;display:grid;place-items:center;background:linear-gradient(135deg,#f7f7f8,#eceff2);padding:30px}.nhe-login-card{width:min(440px,100%);background:#fff;border:1px solid var(--nhe-line);border-radius:14px;box-shadow:0 20px 55px rgba(0,0,0,.1);padding:38px}.nhe-login-brand{display:flex;align-items:center;gap:11px;margin-bottom:30px}.nhe-login-card h1{font-size:29px;margin:6px 0}.nhe-login-card>p{color:var(--nhe-muted);font-size:13px;line-height:1.5;margin-bottom:22px}.nhe-login-card label{display:block;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.5px;margin:14px 0}.nhe-login-card label input:not([type=checkbox]){display:block;width:100%;height:44px;margin-top:7px;border:1px solid #d8dce0;border-radius:7px;padding:0 11px;font-size:14px}.nhe-check{display:flex!important;align-items:center;gap:7px;text-transform:none!important;letter-spacing:0!important;color:var(--nhe-muted);font-weight:500!important}.nhe-login-error{background:#fff0f1;color:#a3121d;border:1px solid #ffd0d4;padding:10px;border-radius:7px;font-size:11px}.nhe-login-footer{display:block;text-align:center;color:#9aa0a7;font-size:10px;margin-top:18px}
@media(max-width:1100px){.nhe-sidebar{width:205px}.nhe-main{padding:22px}.nhe-workspace{grid-template-columns:330px minmax(0,1fr)}.nhe-stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){.nhe-topbar{padding:0 16px;height:72px}.nhe-account>div{display:none}.nhe-shell{display:block}.nhe-sidebar{width:100%;height:auto;display:flex;flex-direction:row;gap:4px;overflow-x:auto;padding:8px;position:sticky;top:0;z-index:5}.nhe-sidebar-title,.nhe-sidebar-bottom{display:none}.nhe-nav{white-space:nowrap;width:auto;flex:0 0 auto;padding:10px 12px}.nhe-nav span{display:none}.nhe-main{padding:16px}.nhe-page-head{align-items:flex-start;flex-direction:column}.nhe-page-head .nhe-btn{align-self:stretch}.nhe-two-col,.nhe-workspace{grid-template-columns:1fr}.nhe-preview-card{order:-1}.nhe-stats{grid-template-columns:1fr 1fr}.nhe-grid{grid-template-columns:1fr}.nhe-preview-actions .nhe-btn{flex:1 1 45%}.nhe-login-card{padding:28px}.nhe-login-page{padding:16px}}
@media(max-width:480px){.nhe-topbar{height:64px}.nhe-brand-link b{font-size:16px}.nhe-brand-link small{font-size:8px;letter-spacing:2px}.nhe-brand-mark{width:34px;height:34px;font-size:18px}.nhe-main{padding:12px}.nhe-page-head h1{font-size:25px}.nhe-stats{gap:8px}.nhe-stat{padding:14px}.nhe-stat strong{font-size:24px}.nhe-card{padding:15px}.nhe-preview-actions .nhe-btn{flex:1 1 100%}}