:root{color-scheme:dark}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#111;color:#eee;margin:0;padding:16px;max-width:720px;margin-inline:auto}h1{font-size:22px;margin:0 0 6px}p{color:#aaa;font-size:14px;margin:0 0 16px}button{padding:12px 18px;font-size:16px;cursor:pointer;background:#2563eb;color:white;border:0;border-radius:6px}button:hover{background:#1d4ed8}.preset-row{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}.preset-row label{font-size:13px;color:#9ca3af}select#preset{padding:8px 10px;font-size:14px;background:#1f2937;color:#e5e7eb;border:1px solid #374151;border-radius:6px}#preset-detail{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:#6b7280}.video-wrap{position:relative;max-width:720px;margin-top:12px}canvas#overlay,video{display:block;width:100%;border-radius:8px}canvas#overlay{position:absolute;top:0;left:0;pointer-events:none}#status{margin-top:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:#9ca3af}#captured{margin-top:16px;display:none}#captured img{max-width:100%;border-radius:8px}.hidden{display:none!important}.mode-picker{display:flex;flex-direction:column;gap:12px;max-width:360px;margin:32px auto}.mode-picker button{padding:18px 22px;font-size:18px;text-align:left;line-height:1.4}.mode-picker button small{display:block;font-size:13px;color:#cbd5e1;margin-top:4px;font-weight:400}.back-btn{background:transparent;color:#9ca3af;padding:4px 0;font-size:14px;border:0;cursor:pointer;margin-bottom:8px}.back-btn:hover{color:#e5e7eb;background:transparent}