:root{color-scheme:light dark;font-family:system-ui,-apple-system,Hiragino Sans,sans-serif}body{margin:0;min-height:100vh;background:#f5f5f5;display:flex;justify-content:center}#app{width:100%;max-width:480px;padding:24px 20px 80px;box-sizing:border-box}.screen.hidden{display:none}h1{font-size:1.4rem}label{display:block;margin-bottom:16px;font-size:.9rem;color:#333}input,textarea{display:block;width:100%;margin-top:6px;padding:10px;font-size:1rem;border:1px solid #ccc;border-radius:8px;box-sizing:border-box}.url-row{display:flex;gap:8px;align-items:center}.url-row input{flex:1}button{font-size:1rem;padding:12px 16px;border-radius:8px;border:none;background:#1f2937;color:#fff;cursor:pointer}button:disabled{opacity:.6;cursor:default}#paste-button{padding:10px 12px;white-space:nowrap}#submit-button{width:100%;margin-top:8px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.link-button{background:none;color:#666;font-size:.8rem;padding:4px;text-decoration:underline}.error{color:#c0392b;font-size:.85rem}.hidden{display:none}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%);background:#1f2937;color:#fff;padding:12px 20px;border-radius:8px;font-size:.9rem;max-width:90vw;text-align:center}.toast.error{background:#c0392b}