*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-base:#0d0f1a;--bg-surface:#13162a;--bg-card:#181c34;--bg-elevated:#1e2340;--border:#ffffff12;--border-glow:#7c5dfa73;--accent:#7c5dfa;--accent-light:#9d7ffc;--accent-glow:#7c5dfa40;--success:#2fd37a;--success-bg:#2fd37a1f;--danger:#ff5d5d;--danger-bg:#ff5d5d1f;--warning:#ffb946;--warning-bg:#ffb9461f;--info:#38c3ff;--info-bg:#38c3ff1f;--text-primary:#eef0ff;--text-secondary:#8b90b8;--text-muted:#555a80;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;--shadow-card:0 4px 32px #00000073;--shadow-glow:0 0 28px #7c5dfa38;--transition:.22s cubic-bezier(.4,0,.2,1);--font:"Inter", sans-serif}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg-base);color:var(--text-primary);min-height:100vh;overflow-x:hidden}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-surface)}::-webkit-scrollbar-thumb{background:var(--accent);border-radius:99px}.app-shell{grid-template-columns:260px 1fr;min-height:100vh;display:grid}.sidebar{background:var(--bg-surface);border-right:1px solid var(--border);flex-direction:column;height:100vh;padding:28px 0;display:flex;position:sticky;top:0;overflow-y:auto}.sidebar-brand{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:0 24px 32px;display:flex}.brand-icon{background:linear-gradient(135deg, var(--accent), #b47bff);width:40px;height:40px;box-shadow:0 4px 16px var(--accent-glow);border-radius:12px;justify-content:center;align-items:center;font-size:20px;display:flex}.brand-name{letter-spacing:-.5px;font-size:18px;font-weight:800}.brand-name span{color:var(--accent-light)}.sidebar-section{padding:24px 16px 8px}.sidebar-label{letter-spacing:1.5px;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px;padding:0 8px;font-size:10px;font-weight:700}.sidebar-nav{flex-direction:column;gap:2px;list-style:none;display:flex}.nav-item{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);color:var(--text-secondary);-webkit-user-select:none;user-select:none;align-items:center;gap:12px;padding:10px 12px;font-size:14px;font-weight:500;display:flex}.nav-item:hover{background:var(--bg-card);color:var(--text-primary)}.nav-item.active{color:var(--accent-light);border-left:3px solid var(--accent);background:linear-gradient(90deg,#7c5dfa2e,#0000);padding-left:9px}.nav-icon{text-align:center;width:22px;font-size:17px}.nav-count{background:var(--accent);color:#fff;border-radius:99px;margin-left:auto;padding:2px 8px;font-size:11px;font-weight:700}.nav-count.done{background:var(--success)}.nav-count.quiz{background:var(--info)}.sidebar-footer{border-top:1px solid var(--border);margin-top:auto;padding:24px 24px 0}.stats-grid{grid-template-columns:1fr 1fr;gap:10px;margin-top:16px;display:grid}.stat-box{background:var(--bg-card);border-radius:var(--radius-sm);text-align:center;border:1px solid var(--border);padding:12px 10px}.stat-num{color:var(--accent-light);font-size:22px;font-weight:800}.stat-lbl{color:var(--text-muted);margin-top:2px;font-size:10px}.main-content{padding:40px 48px;overflow-y:auto}.page-header{margin-bottom:36px}.page-title{letter-spacing:-1px;background:linear-gradient(135deg, var(--text-primary), var(--accent-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:32px;font-weight:800}.page-subtitle{color:var(--text-secondary);margin-top:6px;font-size:14px}.controls-bar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:28px;display:flex}.search-wrapper{flex:1;min-width:200px;position:relative}.search-icon{color:var(--text-muted);pointer-events:none;font-size:16px;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.search-input{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font);transition:var(--transition);outline:none;padding:12px 16px 12px 42px;font-size:14px}.search-input::placeholder{color:var(--text-muted)}.search-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.filter-pill{border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);cursor:pointer;transition:var(--transition);white-space:nowrap;font-size:13px;font-weight:500;font-family:var(--font);padding:10px 18px}.filter-pill:hover{border-color:var(--accent);color:var(--text-primary)}.filter-pill.active{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 4px 14px var(--accent-glow)}.btn-add{border-radius:var(--radius-md);background:linear-gradient(135deg, var(--accent), #b47bff);color:#fff;cursor:pointer;transition:var(--transition);font-size:14px;font-weight:600;font-family:var(--font);white-space:nowrap;box-shadow:0 4px 16px var(--accent-glow);border:none;align-items:center;gap:8px;padding:11px 22px;display:flex}.btn-add:hover{box-shadow:0 8px 24px 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var(--border);cursor:pointer;width:22px;height:22px;transition:var(--transition);background:0 0;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;margin-top:1px;font-size:13px;display:flex}.card-check:hover{border-color:var(--accent)}.card-check.checked{background:var(--success);border-color:var(--success);color:#fff}.card-title{flex:1;font-size:15px;font-weight:700;line-height:1.4}.card-actions{opacity:0;transition:var(--transition);gap:4px;display:flex}.assignment-card:hover .card-actions{opacity:1}.icon-btn{cursor:pointer;width:30px;height:30px;transition:var(--transition);background:0 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slideInRight{0%{opacity:0;transform:translate(80px)}to{opacity:1;transform:translate(0)}}.toast.success{border-color:#2fd37a59}.toast.danger{border-color:#ff5d5d59}.toast-icon{font-size:20px}@media (width<=900px){.app-shell{grid-template-columns:1fr}.sidebar{flex-flow:wrap;gap:12px;height:auto;padding:16px;position:static}.sidebar-brand{border-bottom:none;padding-bottom:0}.sidebar-section{padding:0}.sidebar-nav{flex-flow:wrap;gap:6px}.sidebar-footer{display:none}.main-content{padding:24px 20px}}@media (width<=600px){.assignments-grid,.form-row{grid-template-columns:1fr}.main-content{padding:16px}}