:root{--bg:#1a1a2e;--surface:#252540;--surface2:#2d2d4d;--surface3:#3b3b5c;--border:#2d2d4d;--border-bright:#4b4b6c;--text:#f3f4f6;--text-muted:#9ca3af;--text-dim:#6b7280;--accent:#3b82f6;--accent-glow:#3b82f626;--accent-dim:#3b82f614;--green:#10b981;--green-dim:#10b98114;--red:#ef4444;--red-dim:#ef444414;--yellow:#f59e0b;--yellow-dim:#f59e0b14;--purple:#a78bfa;--mono:"JetBrains Mono", monospace;--sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg);height:100%;color:var(--text);font-family:var(--sans);font-size:14px;line-height:1.6}.app{flex-direction:column;min-height:100vh;display:flex}header{border-bottom:1px solid var(--border);background:var(--bg);z-index:100;flex-shrink:0;justify-content:space-between;align-items:center;padding:20px 40px;display:flex;position:sticky;top:0}.logo-header{align-items:center;gap:12px;text-decoration:none;display:flex}.logo-header span{color:var(--text);font-size:24px;font-weight:600}header nav{align-items:center;gap:30px;margin-left:auto;display:flex}header nav a{color:var(--text-muted);font-size:15px;text-decoration:none;transition:color .2s}header nav a:hover,header nav a.active{color:var(--text)}.nav-dropdown{position:relative}.nav-dropdown-btn{color:var(--text-muted);font-family:var(--sans);cursor:pointer;background:0 0;border:none;align-items:center;gap:4px;font-size:15px;transition:color .2s;display:flex}.nav-dropdown-btn:hover,.nav-dropdown-btn.active{color:var(--text)}.dropdown-arrow{font-size:10px}.nav-dropdown-menu{background:var(--surface);border:1px solid var(--border-bright);z-index:200;border-radius:8px;min-width:160px;margin-top:8px;padding:6px 0;display:none;position:absolute;top:100%;left:50%;transform:translate(-50%);box-shadow:0 8px 24px #0000004d}.nav-dropdown.is-open .nav-dropdown-menu{display:block}.nav-dropdown-menu a:focus{background:var(--surface2);color:var(--text);outline:none}.nav-dropdown-menu a{color:var(--text-muted);padding:8px 16px;font-size:14px;text-decoration:none;transition:all .15s;display:block}.nav-dropdown-menu a:hover{background:var(--surface2);color:var(--text)}.nav-dropdown-menu a.active{color:var(--accent)}.github-link{background:var(--surface);border-radius:8px;align-items:center;gap:8px;padding:8px 16px;transition:background .2s;display:flex;color:var(--text)!important}.github-link:hover{background:var(--surface2)}.badge{font-family:var(--mono);background:var(--accent-dim);color:var(--accent);letter-spacing:.5px;border:1px solid #3b82f633;border-radius:4px;padding:2px 6px;font-size:10px;font-weight:700}.mode-bar{border-bottom:1px solid var(--border);background:var(--surface);flex-shrink:0;align-items:center;gap:16px;height:44px;padding:0 24px;display:flex}.mode-label{text-transform:uppercase;letter-spacing:1px;color:var(--text-dim);font-size:11px;font-weight:600}.mode-toggle{background:var(--bg);border:1px solid var(--border);border-radius:6px;display:flex;overflow:hidden}.mode-btn{font-family:var(--mono);color:var(--text-muted);cursor:pointer;letter-spacing:.3px;background:0 0;border:none;padding:5px 14px;font-size:12px;font-weight:500;transition:all .15s}.mode-btn:hover{color:var(--text);background:var(--surface3)}.mode-btn.active{color:#fff;background:linear-gradient(135deg,#3b82f6,#1d4ed8)}.mode-desc{font-family:var(--mono);color:var(--text-dim);background:var(--surface2);border:1px solid var(--border);border-radius:4px;padding:3px 10px;font-size:11px}.category-badge{font-family:var(--mono);text-transform:uppercase;letter-spacing:.5px;border-radius:3px;flex-shrink:0;padding:1px 6px;font-size:9px;font-weight:700}.category-badge.wellformedness{background:var(--red-dim);color:var(--red);border:1px solid #ef444433}.category-badge.semantic{color:var(--yellow);background:#f59e0b14;border:1px solid #f59e0b33}.category-badge.structural{background:var(--accent-dim);color:var(--accent);border:1px solid #3b82f633}.category-badge.flat_impact{color:var(--purple);background:#a78bfa14;border:1px solid #a78bfa33}.error-item.error-type-info{border-left:3px solid var(--purple)}.issue-code{font-family:var(--mono);color:var(--text-dim);margin-bottom:4px;font-size:10px;font-weight:700}.issue-meta{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:6px;display:flex}.issue-xpath{font-family:var(--mono);color:var(--text-dim);word-break:break-all;font-size:10px}.platform-bar{border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0;align-items:center;gap:16px;height:44px;padding:0 24px;display:flex}.platform-label{text-transform:uppercase;letter-spacing:1px;color:var(--text-dim);font-size:11px;font-weight:600}.platform-toggle{background:var(--bg);border:1px solid var(--border);border-radius:6px;display:flex;overflow:hidden}.platform-btn{font-family:var(--mono);color:var(--text-muted);cursor:pointer;letter-spacing:.3px;background:0 0;border:none;padding:5px 14px;font-size:12px;font-weight:500;transition:all .15s}.platform-btn:hover{color:var(--text);background:var(--surface3)}.platform-btn.active{color:#fff;background:linear-gradient(135deg,#3b82f6,#1d4ed8)}.platform-hint{font-family:var(--mono);color:var(--text-dim);background:var(--surface2);border:1px solid var(--border);border-radius:4px;padding:3px 10px;font-size:11px}.load-example-btn{font-family:var(--mono);border:1px solid var(--border-bright);color:var(--text-muted);cursor:pointer;letter-spacing:.3px;background:0 0;border-radius:5px;margin-left:auto;padding:5px 12px;font-size:11px;font-weight:500;transition:all .15s}.load-example-btn:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-dim)}main{flex:1;grid-template-rows:auto 1fr;grid-template-columns:1fr 1fr;min-height:0;display:grid;overflow:hidden}.panel{border-right:1px solid var(--border);flex-direction:column;display:flex;overflow:hidden}.panel:last-child{border-right:none}.panel-header{border-bottom:1px solid var(--border);background:var(--surface);flex-shrink:0;align-items:center;gap:8px;padding:10px 16px;display:flex}.panel-title{text-transform:uppercase;letter-spacing:1.2px;color:var(--text-muted);font-size:11px;font-weight:700}.panel-count{font-family:var(--mono);color:var(--text-dim);margin-left:auto;font-size:10px}.clear-btn{font-family:var(--mono);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:4px;padding:3px 8px;font-size:10px;transition:all .15s}.clear-btn:hover{color:var(--red);border-color:var(--red)}textarea{background:var(--bg);resize:vertical;min-height:200px;color:var(--text);font-family:var(--mono);tab-size:2;width:100%;caret-color:var(--accent);border:none;outline:none;flex:1;padding:16px;font-size:12px;line-height:1.7}textarea::placeholder{color:var(--text-dim)}textarea:focus{background:var(--surface)}.action-bar{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface);flex-shrink:0;align-items:center;gap:12px;padding:12px 24px;display:flex}.validate-btn{font-family:var(--sans);letter-spacing:.3px;color:#fff;cursor:pointer;background:linear-gradient(135deg,#3b82f6,#1d4ed8);border:none;border-radius:7px;align-items:center;gap:8px;padding:9px 24px;font-size:13px;font-weight:700;transition:all .15s;display:flex}.validate-btn:hover{transform:translateY(-2px);box-shadow:0 8px 20px #3b82f666}.validate-btn:active{transform:translateY(0)}.validate-btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none;transform:none}.validate-btn .shortcut{font-family:var(--mono);opacity:.7;background:#ffffff26;border-radius:3px;padding:2px 6px;font-size:10px}.status-pill{font-family:var(--mono);border-radius:6px;align-items:center;gap:6px;padding:6px 14px;font-size:12px;font-weight:500;transition:all .2s;display:flex}.status-pill.valid{background:var(--green-dim);color:var(--green);border:1px solid #3dd68c33}.status-pill.invalid{background:var(--red-dim);color:var(--red);border:1px solid #f0606033}.status-pill.idle{background:var(--surface2);color:var(--text-dim);border:1px solid var(--border)}.status-dot{background:currentColor;border-radius:50%;width:7px;height:7px}.stats{font-family:var(--mono);color:var(--text-dim);margin-left:auto;font-size:11px}.results-area{flex:1;padding:0;overflow-y:auto}.results-empty{height:100%;color:var(--text-dim);font-family:var(--mono);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:32px;font-size:12px;display:flex}.results-empty .icon{opacity:.3;font-size:32px}.section-header{text-transform:uppercase;letter-spacing:1.2px;color:var(--text-dim);border-bottom:1px solid var(--border);background:var(--bg);z-index:10;padding:10px 16px 8px;font-size:10px;font-weight:700;position:sticky;top:0}.error-item{border-bottom:1px solid var(--border);padding:14px 16px;transition:background .1s}.error-item:hover{background:var(--surface)}.error-item.error-type-error{border-left:3px solid var(--red)}.error-item.error-type-warning{border-left:3px solid var(--yellow)}.error-item.error-type-success{border-left:3px solid var(--green)}.error-path{font-family:var(--mono);color:var(--red);word-break:break-all;align-items:flex-start;gap:6px;margin-bottom:5px;font-size:11px;display:flex}.error-path.warn{color:var(--yellow)}.error-icon{flex-shrink:0;margin-top:1px}.error-msg{color:var(--text-muted);margin-bottom:6px;font-size:12px;line-height:1.5}.suggestion{font-family:var(--mono);color:var(--green);background:var(--green-dim);cursor:pointer;word-break:break-all;border:1px solid #3dd68c26;border-radius:5px;align-items:center;gap:6px;padding:6px 10px;font-size:11px;transition:all .15s;display:flex}.suggestion:hover{background:#3dd68c26}.suggestion .arrow{flex-shrink:0}.copy-btn{font-family:var(--mono);color:var(--green);cursor:pointer;background:0 0;border:1px solid #3dd68c4d;border-radius:3px;flex-shrink:0;margin-left:auto;padding:2px 6px;font-size:9px;transition:all .15s}.copy-btn:hover{background:#3dd68c33}.explorer-panel{border-top:1px solid var(--border);flex-direction:column;grid-column:1/-1;max-height:0;transition:max-height .3s;display:flex;overflow:hidden}.explorer-panel.open{max-height:240px}.explorer-header{background:var(--surface2);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:8px;padding:8px 16px;display:flex}.explorer-title{text-transform:uppercase;letter-spacing:1.2px;color:var(--text-dim);font-size:11px;font-weight:700}.explorer-search{font-family:var(--mono);background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:5px;outline:none;width:240px;margin-left:auto;padding:4px 10px;font-size:11px;transition:border-color .15s}.explorer-search:focus{border-color:var(--accent)}.explorer-search::placeholder{color:var(--text-dim)}.explorer-toggle{font-family:var(--mono);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:4px;padding:4px 10px;font-size:10px;transition:all .15s}.explorer-toggle:hover{color:var(--accent);border-color:var(--accent)}.explorer-list{flex:1;padding:8px 0;overflow-y:auto}.explorer-path{font-family:var(--mono);color:var(--text-muted);cursor:default;align-items:center;gap:8px;padding:3px 16px;font-size:11px;transition:background .1s;display:flex}.explorer-path:hover{background:var(--surface2);color:var(--text)}.explorer-path .type-tag{background:var(--surface3);color:var(--text-dim);text-transform:uppercase;letter-spacing:.5px;border-radius:3px;flex-shrink:0;padding:1px 5px;font-size:9px;font-weight:700}.explorer-path.highlighted{background:var(--accent-dim);color:var(--accent)}footer{border-top:1px solid var(--border);background:var(--bg);color:var(--text-dim);flex-wrap:wrap;flex-shrink:0;justify-content:center;align-items:center;gap:12px;padding:20px 40px;font-size:14px;display:flex}footer a{color:var(--accent);text-decoration:none}footer a:hover{text-decoration:underline}footer .sep{color:var(--border)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--border-bright)}@keyframes slide-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.error-item{animation:.15s both slide-in}.loading-overlay{z-index:1000;backdrop-filter:blur(4px);background:#1a1a2ed9;flex-direction:column;justify-content:center;align-items:center;gap:16px;transition:opacity .3s;display:flex;position:fixed;inset:0}.loading-overlay.hidden{opacity:0;pointer-events:none}.loading-spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{font-family:var(--mono);color:var(--text-muted);text-align:center;font-size:12px}.loading-step{font-family:var(--mono);color:var(--text-dim);font-size:11px}.toast{background:var(--surface2);border:1px solid var(--border-bright);font-family:var(--mono);color:var(--text-muted);z-index:1001;opacity:0;pointer-events:none;text-align:center;border-radius:8px;max-width:500px;padding:10px 18px;font-size:11px;transition:opacity .3s,transform .3s;position:fixed;bottom:60px;left:50%;transform:translate(-50%)translateY(20px)}.toast.show{opacity:1;pointer-events:auto;transform:translate(-50%)translateY(0)}.toast.warn{border-color:var(--yellow);color:var(--yellow)}.engine-status{font-family:var(--mono);align-items:center;gap:5px;font-size:10px;display:flex}.engine-dot{background:var(--text-dim);border-radius:50%;width:6px;height:6px}.engine-dot.python{background:var(--green)}.engine-dot.js{background:var(--yellow)}.engine-dot.loading{background:var(--accent);animation:1.5s infinite pulse}@keyframes pulse{0%,to{opacity:.4}50%{opacity:1}}.retry-btn{font-family:var(--mono);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:4px;padding:2px 8px;font-size:10px;transition:all .15s}.retry-btn:hover{color:var(--accent);border-color:var(--accent)}@media (width<=900px){main{grid-template-rows:1fr 1fr;grid-template-columns:1fr}.panel{border-right:none;border-bottom:1px solid var(--border)}header{flex-wrap:wrap;gap:16px;padding:16px 20px}header nav{flex-wrap:wrap;justify-content:center;gap:16px}header nav a:not(.github-link){font-size:14px}.github-link{padding:6px 12px;font-size:14px}.platform-bar{flex-wrap:wrap;gap:8px;height:auto;padding:10px 16px}.platform-hint{flex-basis:100%;order:3}.load-example-btn{margin-left:auto}}@media (width<=480px){header{padding:12px 16px}header nav{gap:12px}.logo-header span{font-size:20px}footer{padding:16px;font-size:12px}.platform-bar{gap:6px;padding:8px 12px}.platform-label{font-size:10px}.platform-btn{padding:4px 10px;font-size:11px}.platform-hint{font-size:10px}}.change-report{padding:16px}.change-report-summary{font-family:var(--mono);color:var(--text-muted);background:var(--surface);border-bottom:1px solid var(--border);padding:12px 16px;font-size:12px;font-weight:600}.change-category{margin-bottom:16px}.change-category-header{font-family:var(--mono);text-transform:uppercase;letter-spacing:1.2px;color:var(--text-dim);border-bottom:1px solid var(--border);margin-bottom:8px;padding:8px 0;font-size:10px;font-weight:700}.change-item{font-family:var(--mono);color:var(--text-muted);word-break:break-all;align-items:flex-start;gap:8px;padding:4px 0;font-size:11px;line-height:1.5;display:flex}.change-item .change-arrow{color:var(--text-dim);flex-shrink:0}.diff-added{color:var(--green);background:var(--green-dim);border-radius:3px;padding:1px 4px}.diff-removed{color:var(--red);background:var(--red-dim);border-radius:3px;padding:1px 4px;text-decoration:line-through}.diff-unchanged{color:var(--text-dim)}