:root{color-scheme:light;--bg:#f6f7fb;--surface:#ffffff;--border:#e6e8ef;--border-soft:#f0f1f6;--text:#111827;--text-soft:#4b5563;--muted:#6b7280;--primary:#4f46e5;--primary-hover:#4338ca;--primary-soft:#eef2ff;--sidebar:#0f172a;--sidebar-hover:#1e293b;--sidebar-text:#94a3b8;--radius:12px;--shadow:0 1px 2px rgba(16,24,40,0.04),0 1px 3px rgba(16,24,40,0.06);--shadow-lg:0 10px 30px rgba(16,24,40,0.1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;font-size:14px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:240px;flex-shrink:0;background:var(--sidebar);color:var(--sidebar-text);display:flex;flex-direction:column;position:-webkit-sticky;position:sticky;top:0;height:100vh;overflow-y:auto}.sidebar-header{display:flex;align-items:center;gap:12px;padding:22px 20px}.logo-mark{width:34px;height:34px;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;flex-shrink:0}.sidebar-title{font-size:15px;font-weight:700;color:#f8fafc;line-height:1.2}.sidebar-sub{font-size:11px;color:var(--sidebar-text)}.sidebar-nav{flex:1 1;padding:8px 12px;display:flex;flex-direction:column;gap:2px}.nav-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:#64748b;padding:14px 10px 6px}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;font-size:13.5px;font-weight:500;color:var(--sidebar-text);transition:background .15s,color .15s}.nav-item:hover{background:var(--sidebar-hover);color:#f1f5f9}.nav-item.active{background:var(--primary);color:#fff}.nav-icon{width:18px;height:18px;flex-shrink:0}.sidebar-footer{padding:14px;border-top:1px solid #1e293b;display:flex;flex-direction:column;gap:10px}.session-name{font-size:13px;font-weight:600;color:#f1f5f9}.session-role{font-size:11.5px;color:#64748b;word-break:break-all}.btn-logout{background:#1e293b;color:#cbd5e1;border:none;padding:8px 12px;border-radius:8px;font-size:12.5px;font-weight:500;cursor:pointer;width:100%;transition:background .15s}.btn-logout:hover{background:#334155;color:#fff}.page-content{flex:1 1;min-width:0;padding:32px 40px;max-width:1400px}.page-header{margin-bottom:24px}.header-content{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}.page-title{font-size:24px;font-weight:700;letter-spacing:-.01em}.page-sub{color:var(--muted);margin-top:4px;font-size:14px}.breadcrumb{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);margin-bottom:8px}.breadcrumb-link{color:var(--primary);font-weight:500}.breadcrumb-link:hover{text-decoration:underline}.breadcrumb-sep{color:#d1d5db}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:24px;gap:24px;align-items:start}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-6{margin-bottom:24px}.ml-4{margin-left:6px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card>.section-heading{padding:16px 20px 0}.section-heading{font-size:15px;font-weight:600;color:var(--text);margin-bottom:12px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));grid-gap:16px;gap:16px;margin-bottom:28px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;display:block}.stat-card-link{transition:transform .15s,box-shadow .15s,border-color .15s}.stat-card-link:hover{transform:translateY(-2px);border-color:#c7d2fe;box-shadow:var(--shadow-lg)}.stat-label{font-size:12px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.05em;display:block}.stat-value{font-size:28px;font-weight:700;margin-top:6px;display:block;line-height:1.1}.stats-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:16px;gap:16px}.stat-mini{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}.stat-mini .stat-value{font-size:26px}.table{width:100%;border-collapse:collapse}.table td,.table th{padding:12px 20px;text-align:left;border-bottom:1px solid var(--border-soft);font-size:13.5px}.table th{font-size:11.5px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.05em;background:#fafbfd}.table tbody tr:last-child td{border-bottom:none}.table tbody tr:hover{background:#fafbff}.table-link{color:var(--primary);font-weight:500}.table-link:hover{text-decoration:underline}.muted{color:var(--muted)}.mono,code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}code{background:#f3f4f6;padding:2px 6px;border-radius:4px;color:var(--text-soft)}.empty-msg{padding:20px;font-size:13.5px;color:var(--muted)}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:20px;gap:20px}.center-card{display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}.center-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card-header{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;padding:18px 20px 0}.card-title{font-size:16px;font-weight:600;line-height:1.4}.card-id{color:#9ca3af;max-width:40%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.card-description{padding:10px 20px 0;font-size:13.5px;color:var(--text-soft);flex:1 1}.card-footer{padding:16px 20px 18px}.detail-section{padding-bottom:4px}.detail-section .section-heading{padding:16px 20px 8px;margin:0}.classes-list,.students-list,.teachers-list{list-style:none}.detail-row{display:flex;gap:16px;padding:12px 20px;border-top:1px solid var(--border-soft);font-size:13.5px}.detail-label{color:var(--muted);width:120px;flex-shrink:0}.detail-value{flex:1 1;min-width:0}.badge{display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;font-size:11.5px;font-weight:600;white-space:nowrap;background:#f3f4f6;color:#4b5563}.badge-admin{background:#fef3c7;color:#92400e}.badge-moderator{background:#ede9fe;color:#6d28d9}.badge-draft,.badge-user{background:#f3f4f6;color:#4b5563}.badge-submitted,.badge-teacher{background:#dbeafe;color:#1e40af}.badge-published,.badge-reviewed,.badge-status-active,.badge-student{background:#d1fae5;color:#065f46}.badge-archived,.badge-status-disabled{background:#fee2e2;color:#991b1b}.badge-status-pending_email_verification{background:#fef9c3;color:#854d0e}.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s;font-family:inherit}.btn-primary{background:var(--primary);color:#fff;border:1px solid var(--primary)}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:var(--surface);color:var(--text-soft);border:1px solid var(--border)}.btn-secondary:hover{background:#f9fafb;border-color:#d1d5db}.btn-sm{padding:6px 12px;font-size:12.5px}.action-row{display:flex;gap:8px;flex-wrap:wrap;padding:0 20px 16px}.empty-state{display:flex;flex-direction:column;align-items:center;text-align:center;padding:48px 24px;color:#9ca3af}.empty-message{margin-top:12px;font-size:15px;font-weight:600;color:var(--text)}.empty-hint{margin-top:4px;color:var(--muted)}.auth-root{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(circle at 20% 0,#e0e7ff 0,transparent 50%),radial-gradient(circle at 100% 100%,#ede9fe 0,transparent 45%),var(--bg)}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:36px;width:100%;max-width:420px;box-shadow:var(--shadow-lg)}.auth-logo{display:flex;align-items:center;gap:12px;margin-bottom:8px}.auth-title{font-size:20px;font-weight:700}.auth-sub{color:var(--muted);margin-bottom:24px}.auth-form{display:flex;flex-direction:column;gap:6px}.auth-form .btn-primary{margin-top:12px;width:100%}.auth-form .btn-secondary{margin-top:4px;width:100%}.auth-footer{margin-top:20px;text-align:center;font-size:13px}.field-link{color:var(--primary);font-weight:500}.field-link:hover{text-decoration:underline}.field-label{display:block;font-size:13px;font-weight:600;color:var(--text-soft);margin:8px 0 2px}.field-input{display:block;width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s}.field-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.15)}.field-input:disabled{background:#f9fafb}.promote-form{display:flex;flex-direction:column;gap:6px;padding:0 20px 20px}.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca;border-radius:8px;padding:10px 14px;font-size:13px;margin-bottom:8px}@media (max-width:1000px){.two-col{grid-template-columns:1fr}.page-content{padding:24px}}@media (max-width:760px){.app-shell{flex-direction:column}.sidebar{width:100%;height:auto;position:static}.sidebar-nav{flex-direction:row;flex-wrap:wrap}.nav-label{display:none}.stats-row{grid-template-columns:1fr}.page-content{padding:16px}.card{overflow-x:auto}}