/* FH6 Road Finder — Dark theme, 1080p-2160p, up to 32:9 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0e0e0e;--panel:#1a1a1a;--border:#2a2a2a;
  --text:#e8e8e8;--dim:#999;--accent:#ff4444;--accent2:#ff6666;
  --inp:#222;--inp-b:#444;--success:#44cc66;--warn:#ffaa22;
}
html{font-size:clamp(13px,0.8vw,16px)}
body{font-family:"Segoe UI",system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh}
header{text-align:center;padding:24px 20px 14px;border-bottom:1px solid var(--border)}
header h1{font-size:1.6rem;font-weight:700;letter-spacing:-0.5px}
.subtitle{color:var(--dim);margin-top:2px;font-size:0.9rem}
.privacy-note{display:inline-block;margin-top:8px;padding:3px 12px;background:#1a2a1a;border:1px solid #2a4a2a;border-radius:4px;color:var(--success);font-size:0.78rem}
main{max-width:2200px;margin:0 auto;padding:16px}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:18px;margin-bottom:14px}
.panel h2{font-size:1rem;font-weight:600;margin-bottom:10px}
.drop-zone{border:2px dashed var(--inp-b);border-radius:8px;padding:28px 20px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s}
.drop-zone:hover,.drop-zone.drag-over{border-color:var(--accent);background:rgba(255,68,68,.05)}
.drop-text{font-size:1rem;color:var(--dim)}
.drop-or{color:var(--dim);margin:6px 0;font-size:.82rem}
.drop-formats{color:var(--dim);font-size:.78rem;margin-top:8px}
.site-notice{margin-top:12px;padding:9px 12px;border:1px solid rgba(255,170,34,.45);border-radius:6px;background:rgba(255,170,34,.08);color:#e4d0aa;font-size:.82rem}
.site-notice strong{color:var(--warn)}
.file-label{display:inline-block;padding:7px 20px;background:var(--accent);color:#fff;border-radius:5px;cursor:pointer;font-weight:500;transition:background .2s}
.file-label:hover{background:var(--accent2)}
.file-label input[type="file"]{display:none}
.image-info{margin-top:10px;padding:6px 12px;background:var(--inp);border-radius:4px;font-size:.85rem;color:var(--dim)}
.image-info .warn{color:var(--warn)}
.viewer-layout{display:grid;grid-template-columns:1fr 280px;gap:14px;align-items:start}
@media(max-width:900px){.viewer-layout{grid-template-columns:1fr}}
@media(min-width:2000px){.viewer-layout{grid-template-columns:1fr 340px}}
@media(min-width:3000px){.viewer-layout{grid-template-columns:1fr 400px}}
.viewer-panel{min-width:0}
.controls-panel{position:sticky;top:16px}
.viewer-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:8px}
.zoom-controls{display:flex;align-items:center;gap:4px}
.zoom-level{font-size:.85rem;font-weight:600;color:var(--accent);min-width:44px}
.results-stats{font-size:.85rem;color:var(--dim)}
.results-stats .stat-value{font-weight:700;color:var(--accent)}
.viewer-container{
  position:relative;width:100%;overflow:hidden;cursor:grab;
  border:1px solid var(--border);border-radius:4px;
  background:repeating-conic-gradient(#222 0% 25%,#1a1a1a 0% 50%) 0 0/16px 16px;
  height:clamp(350px,calc(100vh - 280px),1400px);
}
.viewer-container:active{cursor:grabbing}
.viewer-container canvas{position:absolute;top:0;left:0;transform-origin:0 0;image-rendering:pixelated}
.viewer-hint{font-size:.75rem;color:var(--dim);margin-top:4px}
.ctrl{margin-bottom:14px}
.ctrl label{display:block;font-size:.82rem;font-weight:600;margin-bottom:3px}
.val{font-weight:400;color:var(--accent)}
.hint{font-size:.72rem;color:var(--dim);margin-top:2px;display:block}
.slider{-webkit-appearance:none;appearance:none;width:100%;height:5px;border-radius:3px;background:var(--inp);outline:none;cursor:pointer}
.slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid #fff}
.slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid #fff}
.slider-labels{display:flex;justify-content:space-between;font-size:.68rem;color:var(--dim);margin-top:1px}
.colour-swatches{display:flex;gap:5px;align-items:center;flex-wrap:wrap;margin-top:2px}
.swatch{width:26px;height:26px;border-radius:4px;border:2px solid transparent;cursor:pointer;transition:border-color .15s,transform .15s;padding:0}
.swatch:hover{transform:scale(1.1)}
.swatch.active{border-color:#fff;transform:scale(1.12)}
.check-row{display:flex!important;align-items:center;gap:7px;margin-top:9px!important;font-weight:500!important;cursor:pointer}
.check-row input{accent-color:var(--accent);cursor:pointer}
.cycle-speed-label{margin-top:9px!important}
input[type="color"]{width:26px;height:26px;border:2px solid var(--inp-b);border-radius:4px;padding:0;cursor:pointer;background:none}
input[type="color"]::-webkit-color-swatch-wrapper{padding:1px}
input[type="color"]::-webkit-color-swatch{border:none;border-radius:2px}
.target-colour-row{display:flex;align-items:center;gap:8px;margin-top:2px}
.rgb-display{font-size:.82rem;color:var(--dim);font-family:Consolas,"Courier New",monospace}
.mode-buttons{display:flex;gap:3px;margin-top:2px}
.mode-btn{flex:1;padding:5px 8px;border:1px solid var(--inp-b);border-radius:4px;background:var(--inp);color:var(--dim);cursor:pointer;font-size:.8rem;font-family:inherit;transition:all .15s}
.mode-btn:hover{border-color:var(--accent);color:var(--text)}
.mode-btn.active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.advanced-toggle{margin-top:8px}
.advanced-toggle summary{cursor:pointer;font-size:.82rem;font-weight:500;color:var(--dim);padding:4px 0}
.advanced-toggle summary:hover{color:var(--accent)}
.advanced-toggle .ctrl{margin-top:8px}
.button-row{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap;align-items:center}
.btn{padding:8px 20px;border:none;border-radius:5px;font-size:.88rem;font-weight:600;cursor:pointer;transition:background .2s,opacity .2s;font-family:inherit}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover:not(:disabled){background:var(--accent2)}
.btn-secondary{background:var(--inp);color:var(--text);border:1px solid var(--inp-b)}
.btn-secondary:hover:not(:disabled){background:#333}
.btn-small{padding:4px 10px;font-size:.82rem;background:var(--inp);color:var(--text);border:1px solid var(--inp-b);border-radius:4px}
.btn-small:hover{background:#333;border-color:var(--accent)}
select{background:var(--inp);border:1px solid var(--inp-b);border-radius:4px;color:var(--text);padding:6px 8px;font-size:.85rem;font-family:inherit;outline:none}
.download-mode-select{min-width:130px}
details{margin-bottom:8px}
details summary{cursor:pointer;font-weight:500;color:var(--accent);padding:3px 0;font-size:.9rem}
details summary:hover{color:var(--accent2)}
details ol,details ul{padding-left:20px;margin-top:6px;color:var(--dim);font-size:.88rem}
details li{margin-bottom:3px}
details p{margin-top:6px;color:var(--dim);font-size:.88rem}
footer{text-align:center;padding:14px 20px;color:var(--dim);font-size:.78rem;border-top:1px solid var(--border)}
.hidden{display:none!important}