:root{--bg: #f7f7f8;--fg: #111827;--muted: #6b7280;--accent: #2563eb;--accent-fg: #ffffff;--error: #b91c1c;--ok: #15803d;--border: #d1d5db;--surface: #ffffff}@media (prefers-color-scheme: dark){:root{--bg: #0b0c10;--fg: #f5f5f6;--muted: #9ca3af;--accent: #60a5fa;--accent-fg: #0b0c10;--error: #f87171;--ok: #4ade80;--border: #374151;--surface: #15171c}}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5}main{max-width:720px;margin:0 auto;padding:24px 16px 80px}.page-header h1{font-size:1.75rem;margin:0 0 4px}.subtitle{color:var(--muted);margin:0 0 24px}.step{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px}.step h2{font-size:1.125rem;margin:0 0 8px}.file-input{display:inline-block;margin:12px 0}.file-input input[type=file]{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.file-input-label{display:inline-block;padding:10px 16px;border-radius:8px;background:var(--accent);color:var(--accent-fg);cursor:pointer;font-weight:500}.file-input-label:focus-within,.file-input-label:hover{filter:brightness(1.1)}.preview img{max-width:100%;border-radius:8px;border:1px solid var(--border)}.status{color:var(--muted);margin:8px 0 0}.error{color:var(--error);margin-top:12px}.video-wrap{position:relative;width:100%;aspect-ratio:4 / 3;background:#000;border-radius:8px;overflow:hidden;margin:12px 0}.video-wrap video{width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}.prompt-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:#0006;color:#fff;padding:16px;pointer-events:none}.prompt-text{font-size:1.5rem;font-weight:600;text-shadow:0 1px 2px rgba(0,0,0,.6)}.prompt-countdown{font-size:3rem;font-weight:700;margin-top:8px;text-shadow:0 1px 4px rgba(0,0,0,.7)}.result-message{font-size:1.125rem;margin:0 0 16px}.result-message.ok{color:var(--ok)}.result-message.fail{color:var(--error)}.actions{display:flex;flex-wrap:wrap;gap:8px}.actions button{padding:10px 16px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--fg);font-size:1rem;cursor:pointer}.actions button.primary{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}.debug-overlay{position:fixed;right:12px;bottom:12px;max-width:360px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;line-height:1.4;background:#000000c7;color:#b6f5c2;padding:10px 12px;border-radius:6px;white-space:pre-wrap;z-index:1000}