:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--accent: #818cf8;--accent-dim: #818cf833;--surface: rgba(255, 255, 255, .04);--surface-hover: rgba(255, 255, 255, .07);--border: rgba(255, 255, 255, .1);--text: #fafafa;--text-dim: rgba(255, 255, 255, .6);--radius: .75rem}*{box-sizing:border-box;margin:0}html,body,#root{min-height:100vh;background:#0a0a0a;color:var(--text)}.app{max-width:72rem;margin:0 auto;padding:2rem 1.5rem 4rem}.app-header{text-align:center;margin-bottom:2.5rem}.app-header h1{font-size:2rem;font-weight:700;letter-spacing:-.03em;margin-bottom:.5rem;background:linear-gradient(135deg,#818cf8,#c084fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-dim);font-size:1rem;max-width:36rem;margin:0 auto}.filters{margin-bottom:2rem;display:flex;flex-direction:column;gap:.75rem}.search-input{width:100%;padding:.75rem 1rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:.95rem;outline:none;transition:border-color .2s}.search-input:focus{border-color:var(--accent)}.search-input::placeholder{color:#ffffff59}.filter-row{display:flex;gap:.75rem}.filter-select{flex:1;padding:.6rem 1rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:.875rem;outline:none;cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center}.filter-select:focus{border-color:var(--accent)}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(20rem,1fr));gap:1rem}.course-card{text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;cursor:pointer;transition:background .2s,border-color .2s,transform .15s;color:var(--text);font:inherit;width:100%}.course-card:hover{background:var(--surface-hover);border-color:var(--accent);transform:translateY(-2px)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.5rem}.course-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;color:var(--accent);letter-spacing:.05em}.level-badge{font-size:.7rem;padding:.2rem .6rem;border-radius:1rem;font-weight:600;letter-spacing:.02em}.course-name{font-size:1.1rem;font-weight:600;margin-bottom:.35rem;letter-spacing:-.01em}.course-dept{font-size:.8rem;color:var(--text-dim);margin-bottom:.5rem}.difficulty-dots{display:inline-flex;gap:.3rem;align-items:center}.dot{width:8px;height:8px;border-radius:50%;background:#ffffff26}.dot.filled{background:var(--accent)}.empty-state{text-align:center;padding:4rem 1rem;color:var(--text-dim)}.detail-view{max-width:56rem;margin:0 auto}.back-btn{background:none;border:none;color:var(--accent);font:inherit;font-size:.9rem;cursor:pointer;padding:.5rem 0;margin-bottom:1.5rem;transition:opacity .2s}.back-btn:hover{opacity:.8}.detail-header{margin-bottom:1.5rem}.course-code-lg{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem;color:var(--accent);letter-spacing:.05em}.detail-header h1{font-size:1.75rem;font-weight:700;letter-spacing:-.02em;margin:.25rem 0 .75rem}.detail-meta{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;font-size:.85rem;color:var(--text-dim)}.description{font-size:1rem;line-height:1.7;color:#fffc;margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border)}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}.detail-section h2{font-size:1rem;font-weight:600;margin-bottom:.75rem;color:var(--accent);letter-spacing:-.01em}.detail-section.full-width{grid-column:1 / -1}.tag-list{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem}.tag-item{font-size:.8rem;padding:.3rem .7rem;border-radius:.5rem;background:#ffffff0f;border:1px solid rgba(255,255,255,.08);color:#fffc}.tag-item.prereq{background:#fbbf241a;border-color:#fbbf2433;color:#fbbf24}.tag-item.skill{background:#34d3991a;border-color:#34d39933;color:#34d399}.tag-item.career{background:#60a5fa1a;border-color:#60a5fa33;color:#60a5fa}.tips-list,.textbook-list{padding-left:1.25rem;color:#ffffffbf;font-size:.9rem}.tips-list li,.textbook-list li{margin-bottom:.5rem;line-height:1.6}.textbook-list{list-style:disc}@media(max-width:640px){.app{padding:1.25rem 1rem 3rem}.app-header h1{font-size:1.5rem}.course-grid,.detail-grid{grid-template-columns:1fr}.filter-row{flex-direction:column}}