:root{--primary:#4e6ef2;--primary2:#6c8cff;--navy:#101b3c;--bg:#f4f6fb;--card:#fff;--text:#111827;--muted:#6b7280;--line:#ebedf2;--green:#059669;--orange:#b45309;--red:#dc2626;--blue:#3b5bdb;font-family:"PingFang SC","Microsoft YaHei",Segoe UI,Arial,sans-serif;color:var(--text)}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-size:14px}.app{min-height:100vh;display:flex}.sidebar{width:232px;background:#fff;border-right:1px solid var(--line);padding:22px 12px;position:fixed;height:100vh;overflow:auto;z-index:2}.admin .sidebar{background:var(--navy);border:0;color:#d8e0ff}.brand{display:flex;gap:10px;align-items:center;font-weight:700;font-size:17px;padding:4px 10px 26px}.logo{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary2));display:grid;place-items:center;color:#fff;box-shadow:0 8px 16px #4e6ef244}.group{font-size:11px;color:#9ca3af;letter-spacing:.08em;padding:18px 10px 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0 18px}.field{display:block;margin:0 0 15px;font-weight:600;font-size:13px}.field input,.field textarea{margin-top:7px;width:100%;border:1.5px solid #e5e7eb;border-radius:10px;padding:11px;font:14px inherit;outline:none}.field textarea{height:90px;resize:vertical}.field input:focus,.field textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4e6ef21f}.modal-foot{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}.toast{position:fixed;right:24px;top:78px;width:360px;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 16px 40px #1018282e;z-index:4}.toast-head{padding:9px 14px;background:linear-gradient(90deg,#2d3fa6,#4e6ef2);color:#fff;font-size:12px;font-weight:600}.toast-body{padding:15px}.toast-body h3{margin:0 0 7px;font-size:15px}.toast-body p{margin:0;color:var(--muted);font-size:13px}.toast-foot{padding:0 15px 14px;display:flex;justify-content:flex-end;gap:7px}@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}@media(max-width:1100px){.sidebar{width:64px;padding:20px 8px}.brand span,.group,.nav-item span:not(.nav-icon):not(.badge){display:none}.brand{padding:4px 7px 24px}.nav-item{justify-content:center;padding:11px}.nav-item.active:before{left:-8px}.badge{position:absolute;right:4px;top:4px}.main{margin-left:64px;width:calc(100% - 64px)}.stats{grid-template-columns:repeat(2,1fr)}.courses{grid-template-columns:repeat(2,1fr)}}@media(max-width:720px){.topbar{padding:0 14px}.search{display:none}.content{padding:20px 14px}.banner,.two{grid-template-columns:1fr;display:grid;gap:15px}.banner-stats{gap:14px}.quick,.courses{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}.user div{display:none}.toast{width:calc(100% - 28px);right:14px}.page-head{align-items:flex-start;gap:12px}.page-head .btn{white-space:nowrap}}
.modal-head{display:flex;justify-content:space-between;gap:12px}.icon-close{border:0;background:#f3f5fa;color:var(--muted);width:30px;height:30px;border-radius:9px;font-size:20px;line-height:1;cursor:pointer}.search-modal{max-width:600px}.search-results{border-top:1px solid var(--line);max-height:410px;overflow:auto}.search-result{width:100%;display:grid;grid-template-columns:72px 1fr;text-align:left;gap:3px;border:0;border-bottom:1px solid #edf0f5;background:transparent;padding:14px 2px;cursor:pointer;font:inherit}.search-result:hover{background:#f7f9ff}.search-result span{grid-row:1/3;align-self:center;color:var(--primary);font-size:12px;font-weight:700}.search-result strong{font-size:14px}.search-result small{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.empty-search{text-align:center;padding:30px 12px;color:var(--muted)}.empty-search p{margin:8px 0 0}