:root{--bg: #07070E;--surface: #0C0C18;--card: #101020;--card-hover: #131328;--border: rgba(255 255 255 / .055);--border-hi: rgba(255 255 255 / .11);--text: #E8E8F2;--muted: rgba(232 232 242 / .38);--subtle: rgba(232 232 242 / .2);--fd: "Sora", system-ui, sans-serif;--fm: "DM Mono", "Cascadia Code", "Fira Mono", monospace;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--transition: all .18s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:var(--fd);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100dvh}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff17;border-radius:4px}:focus-visible{outline:2px solid rgba(0 212 255 / .7);outline-offset:2px;border-radius:var(--radius-sm)}.app-root{max-width:1280px;margin:0 auto;padding:24px 20px;min-height:100dvh;display:flex;flex-direction:column;gap:20px}.app-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}.header-label{font-family:var(--fm);font-size:9.5px;letter-spacing:.22em;color:var(--subtle);margin-bottom:8px}.header-title{font-size:clamp(22px,4vw,28px);font-weight:800;letter-spacing:-.5px;line-height:1.1}.header-sub{font-family:var(--fm);font-size:11px;color:var(--muted);margin-top:6px}.header-right{display:flex;flex-direction:column;align-items:flex-end;gap:8px}.header-stats{font-family:var(--fm);font-size:10px;color:var(--subtle)}.stat-sep{margin:0 6px}.btn-prompt{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 14px;color:var(--muted);font-family:var(--fm);font-size:11px;cursor:pointer;transition:var(--transition);white-space:nowrap}.btn-prompt:hover,.btn-prompt.active{background:#ffffff0d;border-color:var(--border-hi);color:var(--text)}.prompt-stack{display:flex;flex-direction:column;gap:10px}.prompt-box{background:#050510;border:1px solid rgba(255 255 255 / .07);border-radius:var(--radius-lg);padding:20px;font-family:var(--fm);font-size:10.5px;color:#ffffff85;white-space:pre-wrap;line-height:1.75;overflow-x:auto}.layout{display:grid;grid-template-columns:240px 1fr;gap:18px;flex:1;min-height:0}.sidebar{display:flex;flex-direction:column;gap:12px;min-height:0}.unit-nav{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:5px;display:flex;flex-direction:column;gap:2px}.unit-tab{display:flex;align-items:center;gap:9px;background:none;border:none;border-left:3px solid transparent;border-radius:var(--radius-sm);padding:8px 10px;cursor:pointer;color:var(--muted);text-align:left;width:100%;transition:var(--transition)}.unit-tab:hover{background:#ffffff08;color:var(--text)}.unit-tab.active{color:#fff}.unit-tab-icon{font-size:14px;flex-shrink:0}.unit-tab-body{display:flex;flex-direction:column;gap:1px}.unit-tab-num{font-family:var(--fd);font-size:12px;font-weight:600}.unit-tab-title{font-family:var(--fm);font-size:9.5px;color:var(--subtle);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px}.topic-list{display:flex;flex-direction:column;gap:0;overflow-y:auto;max-height:460px}.topic-btn{display:flex;align-items:flex-start;gap:8px;background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;cursor:pointer;text-align:left;width:100%;color:var(--muted);font-family:var(--fm);font-size:11px;line-height:1.5;transition:var(--transition);margin-bottom:3px}.topic-btn:hover{border-color:var(--border-hi);color:var(--text);background:#ffffff05}.topic-btn.active{color:#fff}.topic-num{font-size:9px;font-weight:600;flex-shrink:0;margin-top:1px}.topic-label{flex:1}.topic-done{color:#6bcb77;font-size:9px;flex-shrink:0;margin-top:1px}.topic-loading{flex-shrink:0;font-size:11px;margin-top:0}.results-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;overflow-y:auto;max-height:680px;display:flex;flex-direction:column}.results-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 24px;gap:12px}.empty-icon{font-size:44px;opacity:.18}.empty-title{font-family:var(--fm);font-size:13px;color:var(--muted)}.empty-sub{font-family:var(--fm);font-size:10.5px;color:var(--subtle);max-width:280px}.results-loading{display:flex;flex-direction:column;gap:6px}.loading-topic{font-family:var(--fm);font-size:11px;letter-spacing:.04em;margin-bottom:12px}.log-list{list-style:none;display:flex;flex-direction:column;gap:4px}.log-line{display:flex;align-items:center;gap:7px;font-family:var(--fm);font-size:10.5px;color:#ffffff6b}.log-arrow{font-size:9px}.skeletons{display:flex;flex-direction:column;gap:10px;margin-top:20px}.skeleton{height:88px;border-radius:var(--radius-md);background:linear-gradient(90deg,#111120 25%,#181830,#111120 75%);background-size:200% 100%;animation:shimmer 1.6s infinite}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.results-error{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:48px 24px;text-align:center}.error-msg{font-family:var(--fm);font-size:12px;color:var(--muted)}.btn-retry{border:none;border-radius:var(--radius-md);padding:9px 22px;font-family:var(--fm);font-size:12px;font-weight:600;cursor:pointer;color:#000;transition:var(--transition)}.btn-retry:hover{filter:brightness(1.1)}.results-success{display:flex;flex-direction:column;gap:0}.results-meta{margin-bottom:18px}.results-breadcrumb{font-family:var(--fm);font-size:9px;letter-spacing:.18em;color:var(--subtle);margin-bottom:6px}.results-topic{font-size:17px;font-weight:700;line-height:1.35;margin-bottom:12px}.study-tip{border:1px solid;border-radius:var(--radius-md);padding:10px 14px;font-family:var(--fm);font-size:11px;color:#ffffffa8;line-height:1.7}.tip-label{font-weight:500}.video-list{display:flex;flex-direction:column;gap:10px;margin-top:14px;margin-bottom:12px}.btn-refresh{align-self:flex-start;background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 14px;color:var(--subtle);font-family:var(--fm);font-size:10.5px;cursor:pointer;transition:var(--transition)}.btn-refresh:hover{border-color:var(--border-hi);color:var(--muted)}.video-card{background:var(--card);border:1px solid var(--border);border-left-width:3px;border-radius:var(--radius-md);padding:14px 16px;transition:var(--transition);animation:fadeUp .25s ease both}.video-card:hover{background:var(--card-hover);border-color:var(--border-hi);border-left-color:inherit;transform:translateY(-1px)}@keyframes fadeUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.video-card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px}.video-card-main{flex:1;min-width:0}.video-title{display:block;color:#fff;text-decoration:none;font-weight:600;font-size:13.5px;line-height:1.45;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.video-title:hover{text-decoration:underline;text-underline-offset:3px}.video-channel{font-family:var(--fm);font-size:10.5px;color:var(--muted);margin-top:3px}.video-badges{display:flex;flex-direction:column;gap:4px;flex-shrink:0}.badge{display:inline-flex;align-items:center;justify-content:center;padding:2px 8px;border-radius:4px;border:1px solid transparent;font-family:var(--fm);font-size:9.5px;font-weight:500;white-space:nowrap}.badge-diff{background:#ffffff0a;border-color:var(--border)}.video-why{font-family:var(--fm);font-size:10.5px;color:#ffffff6b;line-height:1.65}.section-label{font-family:var(--fm);font-size:9px;letter-spacing:.18em;color:var(--subtle);margin-bottom:10px}.app-footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px;padding-top:14px;border-top:1px solid var(--border);font-family:var(--fm);font-size:9.5px;color:var(--subtle)}.pulse{animation:pulse 1.4s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.3}50%{opacity:1}}@media(max-width:768px){.app-root{padding:16px 14px}.layout{grid-template-columns:1fr;gap:14px}.sidebar{flex-direction:column}.unit-nav{flex-direction:row;flex-wrap:wrap;overflow-x:auto;gap:3px}.unit-tab{min-width:110px;border-left:none;border-bottom:2px solid transparent}.unit-tab.active{border-left-color:transparent!important;border-bottom-color:inherit}.unit-tab-title{display:none}.topic-list{max-height:220px}.results-panel{max-height:unset}.header-right{flex-direction:row;align-items:center}.header-stats{display:none}}@media(max-width:480px){.video-card-top{flex-direction:column;gap:8px}.video-badges{flex-direction:row}.video-title{white-space:normal}}