:root{
    --primary:#a53d3d;
    --primary-dark:#7f2f2f;
    --ink:#1f2937;
    --muted:#6b7280;
    --line:#d7dde6;
    --soft:#f5f7fb;
    --panel:#ffffff;
    --sidebar:#4a5a6a;
    --sidebar-light:#5a6a7b;
    --success:#16803a;
    --warning:#aa6a00;
    --danger:#b42318;
    --info:#175cd3;
}
*{box-sizing:border-box;margin:0;padding:0;font-family:"Segoe UI",Arial,sans-serif}
body{min-height:100vh;background:var(--soft);color:var(--ink);display:flex;flex-direction:column}
a{text-decoration:none;color:inherit}.topbar{height:70px;background:#dbe2eb;border-bottom:1px solid #b0b8c1;display:flex;align-items:center;justify-content:space-between;padding:10px 22px;gap:20px;position:sticky;top:0;z-index:30}.brand{display:flex;align-items:center;gap:12px}.brand img{height:46px;width:auto;display:block}.brand strong{display:block;font-size:17px}.brand small{display:block;font-size:12px;color:#526070;margin-top:2px}.topbar-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.user-chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:13px;color:#374151}.layout{display:flex;flex:1}.sidebar{width:245px;background:var(--sidebar);color:white;padding:18px 12px;min-height:calc(100vh - 70px)}.sidebar-title{font-weight:700;text-transform:uppercase;letter-spacing:.05em;font-size:12px;color:#eaf0f7;margin:8px 10px 12px}.sidebar-title.small{margin-top:24px}.sidebar a{display:flex;align-items:center;gap:10px;color:white;padding:12px 13px;border-radius:10px;margin:4px 0;font-size:14px;transition:.2s}.sidebar a:hover{background:var(--sidebar-light);transform:translateX(2px)}.sidebar i{width:18px;text-align:center}.main{flex:1;padding:28px;max-width:1400px}.footer{background:#dbe2eb;border-top:1px solid #b0b8c1;padding:12px 20px;display:flex;justify-content:center;gap:26px;flex-wrap:wrap;font-size:13px;color:#1a2b3c}.page-title{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:20px}.page-title h1{font-size:28px;margin-bottom:6px}.page-title p{color:var(--muted);line-height:1.5}.panel{background:var(--panel);border:1px solid #e6eaf0;border-radius:16px;padding:22px;box-shadow:0 8px 22px rgba(15,23,42,.06);margin-bottom:22px}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.stat-card{background:linear-gradient(180deg,#fff,#f9fafc);border:1px solid #e6eaf0;border-radius:16px;padding:20px;box-shadow:0 6px 18px rgba(15,23,42,.05)}.stat-card small{display:block;color:var(--muted);font-size:13px}.stat-card strong{display:block;font-size:30px;margin-top:8px}.stat-card i{float:right;color:var(--primary);font-size:24px;opacity:.8}.btn{border:none;border-radius:10px;padding:9px 13px;display:inline-flex;align-items:center;gap:7px;cursor:pointer;font-weight:600;font-size:14px}.btn-primary{background:var(--primary);color:white}.btn-primary:hover{background:var(--primary-dark)}.btn-danger{background:#fff;color:var(--danger);border:1px solid #f0b9b3}.btn-light{background:white;color:#283648;border:1px solid var(--line)}.btn-success{background:var(--success);color:white}.btn-small{padding:6px 9px;font-size:12px}.table-wrap{overflow:auto;border:1px solid #e6eaf0;border-radius:14px;background:white}table{width:100%;border-collapse:collapse;min-width:760px}th,td{padding:12px 13px;border-bottom:1px solid #edf0f4;text-align:left;font-size:14px;vertical-align:middle}th{background:#f3f6fa;color:#38465a;font-size:12px;text-transform:uppercase;letter-spacing:.04em}tr:last-child td{border-bottom:none}.badge{display:inline-block;padding:5px 9px;border-radius:999px;font-size:12px;font-weight:700}.badge-neutral{background:#eef2f7;color:#405066}.badge-success{background:#e8f6ed;color:var(--success)}.badge-warning{background:#fff4df;color:var(--warning)}.badge-danger{background:#ffe9e6;color:var(--danger)}.badge-info{background:#e9f1ff;color:var(--info)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.form-group{display:flex;flex-direction:column;gap:6px}.form-group.full{grid-column:1/-1}label{font-size:13px;font-weight:700;color:#374151}input,select,textarea{border:1px solid #cfd7e3;border-radius:10px;padding:10px 12px;font-size:14px;background:white;color:var(--ink)}textarea{min-height:105px;resize:vertical}.actions{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.muted{color:var(--muted)}.alert{border-radius:12px;padding:12px 14px;margin-bottom:16px;font-weight:600}.alert-success{background:#e8f6ed;color:var(--success);border:1px solid #b9e4c7}.alert-danger{background:#ffe9e6;color:var(--danger);border:1px solid #f6b4ac}.alert-warning{background:#fff4df;color:var(--warning);border:1px solid #f1d29b}.alert-info{background:#e9f1ff;color:var(--info);border:1px solid #b6cdf8}.hero{background:white;border-radius:18px;padding:30px;border:1px solid #e6eaf0;box-shadow:0 8px 22px rgba(15,23,42,.06);margin-bottom:22px}.hero h1{font-size:32px;margin-bottom:12px}.hero p{color:#3a3f48;line-height:1.6;max-width:900px}.feature-card{background:white;border:1px solid #e6eaf0;border-radius:16px;padding:20px;box-shadow:0 6px 18px rgba(15,23,42,.05)}.feature-card h3{color:var(--primary);margin-bottom:9px}.feature-card p,.feature-card li{line-height:1.55;color:#3f4754}.feature-card ul{padding-left:18px}.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#eef2f7,#f8fafc)}.login-card{width:100%;max-width:440px;background:white;border-radius:18px;padding:30px;border:1px solid #e6eaf0;box-shadow:0 18px 45px rgba(15,23,42,.10)}.login-card img{height:54px;display:block;margin-bottom:16px}.login-card h1{font-size:24px;margin-bottom:8px}.login-card p{color:var(--muted);margin-bottom:18px}.login-card .form-group{margin-bottom:14px}.demo-box{background:#f8fafc;border:1px dashed #cbd5e1;border-radius:12px;padding:12px;font-size:13px;color:#475569;margin-top:14px;line-height:1.55}.quick-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.course-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.course-card{border:1px solid #e6eaf0;border-radius:16px;padding:18px;background:white;box-shadow:0 6px 18px rgba(15,23,42,.05)}.course-card h3{margin-bottom:8px;color:var(--ink)}.course-meta{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.empty-state{padding:30px;text-align:center;color:var(--muted);background:#fff;border:1px dashed #cbd5e1;border-radius:14px}.search-row{display:flex;gap:10px;margin-bottom:15px;flex-wrap:wrap}.search-row input,.search-row select{min-width:220px}.notice{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:12px;padding:12px 14px;margin-bottom:16px}
@media(max-width:1050px){.grid-4,.grid-3,.course-list{grid-template-columns:repeat(2,minmax(0,1fr))}.form-grid{grid-template-columns:1fr}.layout{flex-direction:column}.sidebar{width:100%;min-height:auto;display:flex;overflow:auto}.sidebar-title{display:none}.sidebar a{white-space:nowrap}.main{padding:18px}.topbar{position:static;height:auto;align-items:flex-start}.topbar-actions{justify-content:flex-end}.footer{font-size:12px}}
@media(max-width:650px){.grid-4,.grid-3,.grid-2,.course-list{grid-template-columns:1fr}.topbar{flex-direction:column}.topbar-actions{width:100%;justify-content:flex-start}.page-title{flex-direction:column}.hero h1{font-size:26px}}