:root{--primary-color: #2d5a4a;--accent-color: #1e4336;--bg-color: #f6f4f0;--nav-bg-color: #ffffff;--text-primary: #2c2c2c;--text-muted: #5c5c5c;--border-color: #e5e2dc}*{box-sizing:border-box}body{margin:0;font-family:PT Sans,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg-color);color:var(--text-primary);line-height:1.5}#root{min-height:100vh}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}input,button{font:inherit}.container{max-width:900px;margin:0 auto;padding:1rem;width:100%}.card{background:var(--nav-bg-color);border-radius:4px;border:1px solid var(--border-color);box-shadow:0 1px 2px #0000000a;padding:1.5rem;margin-bottom:1rem}.btn{display:inline-block;padding:.5rem 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56px);flex:1}.staff-sidebar{width:220px;min-width:200px;background:var(--nav-bg-color);border-right:1px solid var(--border-color);padding:1rem 0;flex-shrink:0}.staff-sidebar-nav{display:flex;flex-direction:column;gap:.15rem}.staff-sidebar-link{display:block;padding:.5rem 1rem;color:var(--text-primary);text-decoration:none;font-size:.9rem;border-left:3px solid transparent;transition:background .15s ease}.staff-sidebar-link:hover{background:#0000000a;text-decoration:none;color:var(--primary-color)}.staff-sidebar-link-active{background:#2d5a4a14;border-left-color:var(--primary-color);color:var(--primary-color);font-weight:500}.staff-layout-wrap{display:flex;min-height:calc(100vh - 56px);flex:1}.staff-layout-main{flex:1;min-width:0;overflow-x:auto}.course-tabs-select{display:none}@media (max-width: 768px){.student-sidebar{width:72px;min-width:72px;padding:.75rem 0}.student-sidebar-user{flex-direction:column;padding:0 .5rem 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(max-width: 480px){.container{padding:.5rem}.card{padding:1rem}}img,video,iframe{max-width:100%;height:auto}pre,.card pre{overflow-x:auto;-webkit-overflow-scrolling:touch}table{display:block;overflow-x:auto}@media (min-width: 901px){.nav-inner{max-width:900px}}@keyframes skeleton-shimmer{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}.skeleton-block{background:var(--border-color);border-radius:4px;animation:skeleton-shimmer 1.2s ease-in-out infinite}.skeleton-card{background:var(--nav-bg-color);border:1px solid var(--border-color);border-radius:4px;padding:1rem;margin-bottom:1rem}.skeleton-card .skeleton-block{height:1rem;margin-bottom:.5rem}.skeleton-card .skeleton-block:last-child{width:60%;margin-bottom:0}.back-to-top{position:fixed;bottom:1.5rem;right:1.5rem;z-index:100;width:2.5rem;height:2.5rem;padding:0;border-radius:50%;border:1px solid var(--border-color);background:var(--nav-bg-color);box-shadow:0 2px 8px 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